WO2015198872A1

WO2015198872A1 - Reception apparatus, reception method, transmission apparatus, and transmission method

Info

Publication number: WO2015198872A1
Application number: PCT/JP2015/066826
Authority: WO
Inventors: 淳北原; 北里　直久; 山岸　靖明
Original assignee: ソニー株式会社
Priority date: 2014-06-23
Filing date: 2015-06-11
Publication date: 2015-12-30

Abstract

The present technique relates to a reception apparatus, a reception method, a transmission apparatus and a transmission method whereby a high-speed station selection process can be performed. Provided is a reception apparatus comprising: a station selection control unit that performs a station selection control for selecting the station of a digital broadcast using an IP transfer system; a metadata acquisition unit that acquires prior-acquisition metadata of a text format or binary format, which includes control information for selecting a minimum service, prior to SCS metadata of a text format including control information for each of a plurality of services identified by respective IP addresses and transferred in a layer upper than an IP layer in the hierarchy of the protocol of the IP transfer system in the digital broadcast; and a selection control unit that performs, on the basis of acquired second metadata, a selection control of a stream of components constituting the minimum service. The present technique can be applied to, for example, television receivers.

Description

Receiving device, receiving method, transmitting device, and transmitting method

The present technology relates to a reception device, a reception method, a transmission device, and a transmission method, and more particularly, to a reception device, a reception method, a transmission device, and a transmission method that can perform high-speed channel selection processing.

In recent years, digital broadcasting services have been started in various countries (for example, see Patent Document 1). In digital broadcasting, signaling data that defines various parameters used in channel selection processing at the receiver is described in binary format, and may be described in text format using XML (Extensible Markup Language) documents. Assumed.

JP 2008-263616 A

By the way, when signaling data is described in a text format, there are merits such as high extensibility and readability. On the other hand, compared with binary format signaling data, the data size is increased and the transmission band is increased.

For this reason, in digital broadcasting, the operation that employs text format signaling data is longer than the operation that employs binary format signaling data. The station processing may be slow.

The present technology has been made in view of such a situation, and enables high-speed channel selection processing to be performed in an operation employing text-format signaling data in digital broadcasting. .

A receiving apparatus according to a first aspect of the present technology includes a channel selection control unit that performs channel selection control for selecting a digital broadcast using an IP (Internet Protocol) transmission method, and a protocol for the IP transmission method in the digital broadcast. The minimum service is selected in advance of the first metadata in text format including control information for each service identified by the IP address transmitted in the first layer higher than the IP layer in this layer. A metadata acquisition unit that acquires second metadata in text format or binary format that includes control information for performing the processing, and a stream of components that constitute a minimum service based on the acquired second metadata And a selection control unit that performs the selection control.

The data size of the second metadata is smaller than the data size of the first metadata, and the transmission cycle of the second metadata is shorter than the transmission cycle of the first metadata. be able to.

The metadata acquisition unit may acquire the first metadata in parallel with the acquisition of the second metadata.

The minimum service can be composed of main video and main audio components.

The second metadata is transmitted in the second layer lower than the IP layer in the protocol layer of the IP transmission method together with the third metadata in the text format including the control information independent of the service. Can be.

The second metadata may be transmitted together with the first metadata in the first layer.

The second metadata is a third metadata in text format including control information independent of the service, transmitted in a second layer lower than the IP layer in the protocol layer of the IP transmission method. Can be included.

The receiving device may be an independent device or an internal block constituting one device.

The reception method according to the first aspect of the present technology is a reception method corresponding to the reception device according to the first aspect of the present technology described above.

In the receiving device and the receiving method according to the first aspect of the present technology, channel selection control for selecting a digital broadcast using an IP transmission method is performed, and the protocol layer of the IP transmission method is used in the digital broadcast. In order to select the minimum service in advance of the first metadata in text format including the control information for each service identified by the IP address transmitted in the first layer higher than the IP layer in FIG. The second metadata in the text format or binary format including the control information is acquired, and the selection control of the stream of the components constituting the minimum service is performed based on the acquired second metadata.

A transmission device according to a second aspect of the present technology includes an acquisition unit that acquires a component that constitutes a service identified by an IP address in digital broadcasting using an IP transmission method, and an IP in a protocol hierarchy of the IP transmission method. Text format or binary format including first metadata in text format including control information for each service and control information for selecting a minimum service, transmitted in a first layer higher than the layer A generating unit that generates the second metadata, and the receiving device so that the second metadata is acquired prior to the first metadata in the receiving device. The transmission apparatus includes a transmission unit configured to transmit metadata by digital broadcasting using the IP transmission method together with the component stream.

The minimum service can be composed of main video and main audio components.

The transmission device may be an independent device or an internal block constituting one device.

The transmission method according to the second aspect of the present technology is a transmission method corresponding to the transmission device according to the second aspect of the present technology described above.

In the transmission device and the transmission method according to the second aspect of the present technology, a component constituting a service identified by an IP address is acquired in digital broadcasting using the IP transmission method, and the protocol of the IP transmission method is obtained. Text format first metadata including control information for each service and control information for selecting a minimum service, transmitted in a first layer higher than the IP layer in the layer Alternatively, the second metadata in the binary format is generated, and the first metadata and the second metadata are acquired so that the second metadata is acquired prior to the first metadata in the receiving device. Metadata is transmitted together with the component stream by digital broadcasting using the IP transmission method.

According to the first aspect and the second aspect of the present technology, high-speed channel selection processing can be performed.

It should be noted that the effects described here are not necessarily limited, and may be any of the effects described in the present disclosure.

It is a figure which shows the system pipe model of digital broadcasting of an IP transmission system. It is a figure explaining the channel selection process of the digital broadcasting of an IP transmission system. FIG. 10 is a diagram for explaining a channel selection process in operation example 1; It is a figure which shows the structure of the signaling data of the operation example 1. FIG. It is a figure explaining the transmission cycle of chunked SCS metadata and LLS metadata. It is a figure which shows the example of a display of the screen at the time of channel selection operation. FIG. 10 is a diagram for explaining a channel selection process in an operation example 2; It is a figure which shows the structure of the signaling data of the operation example 2. FIG. 10 is a diagram for explaining a channel selection process in an operation example 3; It is a figure which shows the structure of the signaling data of the operation example 3. It is a figure which shows the example of the syntax of DCT of a binary format. It is a figure which shows the example of the syntax of DCT of a binary format. It is a figure which shows the example of the syntax of XML format DCT. It is a figure which shows the structure of one Embodiment of the broadcast communication system to which this technique is applied. It is a figure which shows the structure of one Embodiment of the transmitter to which this technique is applied. It is a figure which shows the structure of one Embodiment of the receiver which applied this technique. It is a figure which shows the functional structural example of the control part of the receiver which applied this technique. It is a flowchart explaining a transmission process. It is a flowchart explaining an initial scan process. It is a flowchart explaining an LLS acquisition / recording process. It is a flowchart explaining the channel selection process in the case of transmitting DCT by LLS. It is a flowchart explaining the channel selection process in the case of transmitting DCT by SCS. It is a figure which shows the structural example of a computer.

Hereinafter, embodiments of the present technology will be described with reference to the drawings. The description will be made in the following order.

1. 1. Outline of digital broadcasting by IP transmission method Operation example (1) Operation example 1: DCT is transmitted by LLS (2) Operation example 2: DCT is transmitted by SCS (3) Operation example 3: Shortcut information is transmitted by LLS Example syntax 4 4. System configuration 5. Flow of processing executed in each device Computer configuration

<1. Overview of digital broadcasting using IP transmission system>

(System pipe model)
FIG. 1 is a diagram showing a system pipe model of digital transmission using the IP transmission method.

1, a plurality of BBP (Base Band Packet) streams are transmitted in a broadcast wave (RF Channel) having a predetermined frequency band. Each BBP stream includes NTP (Network Time Protocol), multiple service channels (Service Channel), ESG (Electronic Service Guide) service, and LLS (Low Layer Signaling). The NTP, service channel, and ESG service are transmitted according to the UDP / IP (User Datagram Protocol / Internet Protocol) protocol, while the LLS is transmitted on the BBP stream.

NTP is time information. ESG service is an electronic service guide. LLS is low layer signaling data. For example, as LLS, LLS metadata such as SCD (Service Configuration Description), EAD (Emergency Alert Description), RRD (Region Rating Description), etc. is transmitted.

SCD shows the BBP stream configuration and service configuration in the broadcast network by an ID system corresponding to MPEG2-TS (Moving Picture Experts Group phase 2 Transport Channel). The SCD includes attribute / setting information for each service, bootstrap information for accessing the ESG service and the SCS, and the like.

EAD contains information about emergency notifications. The RRD includes rating information. Note that LLS metadata such as SCD, EAD, and RRD is described in a markup language such as XML.

A service channel (hereinafter referred to as “service”) is composed of SCS (Service Channel Signaling) and components that make up a program such as video, audio, and subtitles. In addition, a common IP address is given to the elements constituting each service, and components, SCSs, and the like can be packaged for each service using this IP address.

SCS is service unit signaling data. For example, SCS includes SCS such as USBD (User Service Bundle Description), MPD (Media Presentation Description), SDP (Session Description Protocol), FDD (File Delivery Description), SPD (Service Parameter Description), IS (Initialization Segment), etc. Metadata is transmitted.

USBD includes reference information for referencing SCS metadata such as MPD, FDD, SDP. USBD may be referred to as USD (User Service Description). The MPD includes information such as a segment URL (Uniform Resource Locator) for each component stream transmitted in service units. Note that MPD conforms to the MPEG-DASH standard (Moving / Picture / Expert / Group / Dynamic / Adaptive / Streaming / over / HTTP). The SDP includes service attributes for each service, stream configuration information and attributes, filter information, location information, and the like.

The FDD includes information such as location information (for example, URL) and TOI (Transport Object Identifier) as index information for each TSI (Transport Session Identifier). Here, in a FLUTE (File Delivery over Unidirectional Transport) session, a file to be transmitted is managed as one object by TOI. In addition, a set of a plurality of objects is managed as one session by TSI. That is, in the FLUTE session, a specific file can be designated by two pieces of identification information of TSI and TOI. The FDD may be included as an element in the USBD. Further, instead of FLUTE, FLUTE + (FLUTE plus) obtained by expanding FLUTE may be used.

SPD is composed of various parameters specified at the service and component level. The IS includes control information related to segment data of video and audio components transmitted in the FLUTE session.

That is, when video and audio components are transmitted in a FLUTE session, the files of these components are divided into segments, and each segment is composed of an IS (Initialization と Segment) and an MS (Media Segment). The IS includes initialization information such as a data compression method and control information. In addition, video and audio component data is stored in the MS. Each segment of the FLUTE session conforms to the ISO Base Media Media File format.

Note that SCS metadata such as USBD, MPD, SDP, FDD, SPD, and IS is described in a markup language such as XML. Further, the IS may be transmitted as a video or audio stream instead of being transmitted as an SCS stream.

Here, an RF channel ID (RF Channel ID) is assigned to a broadcast wave (RF Channel) having a predetermined frequency band, for example, for each broadcaster. Also, a BBP stream ID (BBP Stream ID) is assigned to one or a plurality of BBP streams transmitted on each broadcast wave. Furthermore, a service ID (Service ID) is assigned to one or more services transmitted in each BBP stream.

Thus, the IP transmission system ID system is a combination of the network ID (Network ID), transport stream ID (Transport Stream ID), and service ID (Service ID) used in the MPEG2-TS system ( Hereinafter, a configuration corresponding to “triplet” is adopted, and a BBP stream configuration and a service configuration in the broadcast network are indicated by this triplet.

By using such an ID system, it is possible to achieve consistency with the MPEG2-TS system that is currently widely used. In the IP transmission system ID system, the RF channel ID and BBP stream ID correspond to the network ID and transport stream ID in the MPEG2-TS system.

(Channel selection processing)
FIG. 2 is a diagram for explaining a channel selection process for digital broadcasting using the IP transmission method. FIG. 2 schematically shows a channel selection process in the receiver.

In FIG. 2, when a channel selection operation is performed by the user, a service ID corresponding to the channel selection operation is identified (S11), and the service ID is selected from the service list of channel selection information (SCD) recorded in NVRAM. A triplet including the ID is identified (S12). Then, according to this triplet, a physical parameter is obtained as a channel selection parameter used when performing a channel selection process. Since the physical parameter includes a frequency and a PLP ID, the physical parameter is connected to the BBP stream according to the frequency and the PLP ID (S13, S14).

In addition, since SC bootstrap information is obtained as a channel selection parameter, the SCS metadata of the service to be selected (“SC1 (Service Channel1)” in FIG. 2) by connecting to the SCS stream according to this SC bootstrap information (USBD, SDP, MPD, etc.) are obtained (S15, S16). Then, according to the information (IP address, port number, and TSI) for connecting to the component stream obtained from the SCS metadata, the component stream is connected (S15, S16). For each TSI, the segment transmitted in each FLUTE session can specify the TOI that changes in time series for each segment, for example, by sequentially incrementing the value of the TOI from the initial value.

Then, segment data is extracted from the LCT packet transmitted in the component stream, thereby obtaining video data and audio data, and performing a rendering process. As a result, the video and audio of the service to be selected (“SC1” in FIG. 2) are reproduced in the receiver.

As described above, the receiver performs the channel selection processing of the IP transmission type digital broadcast.

(Signal data in text format)
By the way, in digital broadcasting by the IP transmission method, signaling data including LLS metadata such as SCD transmitted as LLS and SCS metadata such as USBD, SDP, and MPD transmitted as SCS is converted into an XML document, that is, text. It is assumed to be described in a format. As a result, the expandability and readability can be improved as compared with the binary format signaling data adopted in the MPEG2-TS system, but the data size increases and the transmission band increases.

For example, when transmitting 1000 bytes (8000 bits) of SCS metadata every second, the required transmission bandwidth is 8000 bits per second (bit / s), but when transmitting every 100 milliseconds, Ten times the bandwidth of 80000 bits per second is required.

In addition, in the MPEG2-TS system, PAT (Program Association Table) and PMT (Program Map Table) used at the time of channel selection processing are sent out at a cycle of 100 milliseconds, so even when the IP transmission system is adopted Therefore, it is assumed that the signaling data used at the time of the channel selection process is operated with the same transmission cycle. The PAT is a list of programs included in a certain transport stream, stored as a list of PIDs (Packet IDs) of the PMT. The PMT stores PIDs such as video and audio included in a program.

Therefore, this technology enables high-speed channel selection processing by transmitting text-format signaling data such as LLS metadata and SCS metadata in the IP transmission method with the same transmission cycle as the MPEG2-TS method. Define the metadata to be used. In this metadata, information (control information) for selecting a minimum service is described without using the SCS metadata by the receiver, so that the SCS metadata is acquired in advance. To do. Hereinafter, this metadata will be described as “preceding acquisition metadata”.

Here, the minimum service refers to a service composed of minimum components that should be preferentially provided among components such as video and audio that constitute a certain service. Consists of corresponding components. That is, from the viewpoint of the user, the main information such as the main video and main audio has a higher priority at the time of viewing than the secondary information such as the second audio and subtitles. Ensure that main video and main audio are provided preferentially.

In this case, information (control information) for connecting to the stream of the component corresponding to the main video and the main audio is described in the prior acquisition metadata. The advance acquisition metadata, for example, only describes information for connecting to the component stream corresponding to the main video and main audio, so the data size is the data size of the SCS metadata. Compared to

In addition, either the binary format or the text format is used as the format of the metadata for pre-acquisition. Hereinafter, the binary-form advance acquisition metadata is referred to as DCT (Default Component Table), and the text-form advance acquisition metadata is referred to as DCD (Default Component Description). In the following description, a case where the binary format (DCT) is adopted as the format of the metadata for pre-acquisition will be mainly described.

DCT is transmitted at least one of LLS and SCS. In the receiver, the DCT is acquired prior to the SCS metadata, so that the rendering process can be started quickly by connecting to the main video and main audio streams. In addition, the receiver tries to acquire SCS metadata in parallel with the rendering process of the main video and main audio streams and connects to the stream of all the components constituting the channel selection service ( Control information). As a result, after the acquisition of the SCS metadata is completed, the receiver can connect to a stream of components other than the main video and main audio as a minimum service.

In this way, the DCT is acquired prior to the SCS metadata (USBD, SDP, MPD, etc.), so that the main video and main audio streams are acquired with priority over other streams. Thus, the main video and main audio can be reproduced. At this time, since the DCT has a data size smaller than that of the SCS metadata, the transmitter can suppress the transmission band even if the DCT transmission cycle is shorter than the transmission cycle of the SCS metadata. As a result, the receiver can immediately acquire a DCT transmitted at a transmission cycle shorter than that of the SCS metadata, and can perform a high-speed channel selection process using the DCT.

For example, DCT is transmitted at a transmission cycle of 100 milliseconds, which is the same as the transmission cycle of PMT used at the time of channel selection processing of the MPEG2-TS system, or transmission cycle of 100 milliseconds or less, and SCS metadata (USBD, SDP , MPD, etc.) transmission cycle is longer than the DCT transmission cycle, so that parameters necessary for channel selection processing are transmitted in a shorter cycle, and high-speed channel selection processing is performed while suppressing the transmission band. be able to.

In addition, in the operation of transmitting DCT by LLS, it is possible to detect whether or not the service to be selected is provided by the presence or absence of DCT transmission by LLS. That is, in the receiver, when DCT is transmitted by LLS, it is detected that the service to be selected is valid and the service is provided, while when DCT is not transmitted by LLS. It is detected that the service to be selected is invalid and the service is stopped.

<2. Operation example>

Next, a specific example of operation will be described.

(1) Operation example 1: DCT is transmitted by LLS

(Channel selection processing)
FIG. 3 is a diagram for explaining a channel selection process in Operation Example 1 which is an operation of transmitting DCT by LLS. In FIG. 3, a BBP stream obtained from a digital broadcast signal transmitted from the transmitter to the receiver is schematically illustrated in order to explain the channel selection process in the receiver.

In other words, the transmitter of the broadcasting station (broadcaster) identified by the RF channel ID uses the BBP stream (BBP Stream) identified by the BBP stream ID by the broadcast wave (RF Channel) of the digital broadcast using the IP transmission method. ). In the BBP stream, the components constituting each service identified by the service ID and the SCS stream, as well as the LLS, ESG, and NTP streams are transmitted.

In FIG. 3, service 1 (“SC1 (Service （Channel1)” in FIG. 3) and service 2 (“SC2 (Service Channel2)” in FIG. 3) are provided as services identified by the service ID. . The service 1 is composed of main video (Video) and main audio (Audio) components. These main video and main audio streams are transmitted in the FLUTE session together with the service 1 SCS stream. Similarly to the service 1, the service 2 includes main video and main audio components, and the stream of these components is transmitted in the FLUTE session together with the SCS stream of the service 2.

Further, in the operation example 1 in FIG. 3, the DCT is transmitted by the LLS stream. However, since DCT has a data size smaller than that of SCS metadata (USBD, SDP, MPD, etc.), the transmitter transmits DCT with a transmission cycle shorter than the transmission cycle of SCS metadata.

In FIG. 3, a receiver installed in each home or the like acquires an SCD transmitted in the LLS stream in advance by an initial scanning process, and records it in the internal NVRAM (Non Volatile RAM) as channel selection information. Suppose you are. The SCD includes physical parameters (PHY parameters), SC bootstrap information, and the like as channel selection parameters (Tuning parameters) used when performing channel selection processing for each BBP stream. However, the SCD in FIG. 3 shows only a part of the information included in the SCD for the sake of simplicity.

Here, when the channel selection operation is performed by the user in the receiver, a service ID corresponding to the channel selection operation is specified (S21), and from the channel selection parameter of the channel selection information (SCD) recorded in NVRAM. In accordance with the triplet including the service ID, the physical parameter and the SC bootstrap information are specified (S22).

The receiver is connected to the BBP stream according to the frequency (frequency) as physical parameters and the PLP ID (plp_ID) (S23), and further connected to the LLS stream transmitted by the BBP stream (S24). As a result, the BBP packet is extracted at the receiver (S25), from which the DCT is acquired (S26).

In FIG. 3, since the service 1 is selected by the user, information for selecting a minimum service corresponding to the service ID of the service 1 from the DCT service loop of FIG. To be acquired. Specifically, the DCT in FIG. 3 describes a MIME type, a port number, and a TSI as information for connecting to the main video and main audio streams constituting the service 1.

Further, the receiver is connected to the SCS stream transmitted in the FLUTE session of TSI = 3 in the service 1 according to the IP address, port number, and TSI of the SC bootstrap information (S27). Thereby, in the receiver, the LCT packet transmitted in the FLUTE session with TSI = 3 in the service 1 is extracted (S28), and IS (Initialization Segment) is acquired therefrom (S29).

The receiver acquires the DCT, so that the IP address, the port number, and the TSI for connecting to the main video and main audio stream constituting the service 1 are specified. Connected to the audio stream (S30). As a result, the LCT packet transmitted in the FLUTE session with TSI = 1 in the service 1 is extracted in the receiver (S31), and the main audio MS (Media Segment) is acquired therefrom (S32). In the receiver, the LCT packet transmitted in the FLUTE session with TSI = 2 in the service 1 is extracted (S31), and the MS of the main video is acquired therefrom (S32).

For each TSI, the segment transmitted in each FLUTE session can specify the TOI that changes in time series for each segment, for example, by sequentially incrementing the value of the TOI from the initial value.

In this way, the receiver acquires the IS and MS as the segment, acquires the segment data stored in the MS, and performs the main video and main audio rendering process. As a result, the main video and main audio of service 1 are reproduced in the receiver.

Although not shown, in the receiver, SCS metadata (USBD, SDP, MPD, etc.) is transmitted from the SCS stream transmitted in the FLUTE session of TSI = 3 in service 1 in parallel with the rendering process. The information for connecting to the streams of all the components constituting the service 1 is also obtained by attempting acquisition. Then, after the SCS metadata is acquired, it is possible to connect to a stream of components other than the main video and main audio (for example, second audio, subtitles, etc. (not shown)) constituting the service 1. .

As described above, in the first operation example, the DCT transmitted in the LLS stream is acquired in advance of the SCS metadata such as USBD, SDP, and MPD, and is connected to the main video and main audio streams included in the DCT. The main video and main audio segment data are preferentially acquired according to the information for the main video and main audio streams, and main video and main audio rendering processing is performed.

As described above, in the operation example 1, a certain amount of time is required to output, for example, the second audio or the caption other than the main video and the main audio among all the components constituting the service 1. If this is allowed, the DCT is described so that the main video and the main audio are preferentially output as a minimum service, and are acquired prior to the SCS metadata. At this time, since the DCT has a data size smaller than that of the SCS metadata, the transmitter can suppress the transmission band even if the DCT transmission cycle is shorter than the transmission cycle of the SCS metadata. As a result, the receiver can immediately acquire a DCT transmitted at a transmission cycle shorter than that of the SCS metadata, and can perform high-speed channel selection processing using the DCT.

(Signaling configuration)
FIG. 4 is a diagram illustrating a configuration of signaling data in Operation Example 1 which is an operation of transmitting DCT by LLS.

Referring to FIG. 4, as LLS, DCT as pre-acquisition metadata is transmitted together with LLS metadata such as SCD, EAD, and RDD. The SCD describes a frequency and a PLP ID as physical parameters. The receiver acquires the DCT transmitted in the LLS stream by connecting to the BBP stream according to the frequency and the PLP ID.

In the DCT, information (port number, TSI, etc.) for connecting to the main video and main audio stream that constitutes the service to be selected is described as information for selecting a minimum service. ing. In accordance with DCT, the receiver connects to the stream of the main video (“Main Audio” in FIG. 4) and the main audio (“Main 図 Audio” in FIG. 4) transmitted in the FLUTE session. Segment data is acquired and main video and main audio are rendered. As a result, the receiver reproduces the main video and main audio of the service to be selected.

Also, SC bootstrap information for connecting to the SCS stream is described in the SCD. The receiver tries to acquire the SCS metadata (USBD, SDP, MPD, etc.) transmitted in the FLUTE session according to the SC bootstrap information in parallel with the main video and main audio rendering process, and SCS including information (IP address, port number, TSI, etc.) for connecting to the stream of the second video (“2nd Video” in FIG. 4) and the second audio (“2nd Audio” in FIG. 4) constituting the service Get metadata.

As a result, the receiver is ready to play back the second video and the second audio, so the second transmitted in the FLUTE session according to the SCS metadata (USBD, SDP, MPD, etc.). By connecting to a video or second audio stream, segment data of the second video or second audio can be acquired and a rendering process can be performed. As a result, the receiver can reproduce the second video or the second sound of the service to be selected.

Note that SCS metadata (for example, SPD and MPD) acquired after DCT is also used to connect to the main video ("Main Video" in FIG. 4) and main audio ("Main Audio" in FIG. 4) streams. Information is provided. In other words, the information for connecting to the main video and main audio streams is defined in duplicate in the DCT and SCS metadata. For example, when the DCT could not be acquired for some reason at the receiver. For example (for example, when DCT is not transmitted in the LLS stream), the receiver may connect to the main video and main audio streams using the SCS metadata. However, the SCS metadata may be defined only in the DCT without defining information for connecting to the main video and main audio streams.

In SCD, ESG bootstrap information for connecting to the ESG stream is described. The receiver can acquire the ESG transmitted in the FLUTE session according to the ESG bootstrap information. The ESG is composed of fragments such as a service (Service), content (Content), schedule (Schedule), and purchase item (PurchaseItem). The ESG service is associated with the SCS metadata USBD. ESG is defined by OMA (Open Mobile Alliance).

(Transmission cycle of SCS metadata and LLS metadata)
FIG. 5 is a diagram for explaining the transmission cycle of chunked SCS metadata and LLS metadata in Operation Example 1. In FIG. 5, a stream corresponding to each metadata is schematically represented.

In FIG. 5, MPS, USBD, SDP, etc. as SCS metadata are chunked to a predetermined data size, stored in an LCT packet, and transmitted. Further, SCD or the like as LLS metadata is chunked to a predetermined data size, stored in an LLS packet, and transmitted.

In the BBP stream, an LLS stream and an SCS stream for each service (“SC1 (Service Channel 1)” in FIG. 5) are transmitted. In the SCS stream, MPD, USBD, and SDP LCT packets are repeatedly transmitted in that order. That is, one cycle of MPD, USBD, and SDP that is repeatedly transmitted as an LCT packet is one cycle in the SCS stream.

Also, since DCT is transmitted by LLS, DCT and SCD LLS packets are repeatedly transmitted in that order in the LLS stream. That is, one cycle of DCT and SCD, which is repeatedly transmitted as an LLS packet, is one cycle in the LLS stream.

Thus, since one cycle of the LLS stream is basically shorter than one cycle of the SCS stream, when the DCT is transmitted using the LLS stream, the receiver acquires the DCT that precedes the SCS metadata. Can be acquired quickly.

(Example of screen display during tuning operation)
FIG. 6 is a diagram illustrating a display example of a screen at the time of channel selection operation in the operation example 1. FIG. 6 schematically shows a BBP stream obtained from a digital broadcast signal transmitted from the transmitter to the receiver in order to explain a display example of the screen at the time of channel selection operation at the receiver. The components constituting the service, the SCS stream, the LLS stream, and the like transmitted by the BBP stream are the same as those in FIG.

Here, when the channel selection operation is performed by the user in the receiver, the service ID corresponding to the channel selection operation is specified (S41), and from the channel selection parameter of the channel selection information (SCD) recorded in NVRAM. Physical parameters are specified. The receiver is connected to the LLS stream transmitted by the BBP stream according to the frequency and PLP ID as physical parameters (S42). Thereby, in a receiver, a BBP packet is extracted and DCT is acquired from there (S43).

In FIG. 6, since the service 1 (“SC1” in FIG. 6) is selected by the user's operation, the receiver selects a minimum service corresponding to the service ID of the service 1. Information (port number, TSI, etc.) is acquired. The receiver acquires the DCT, so that the IP address, the port number, and the TSI for connecting to the main video and main audio stream constituting the service 1 are specified. Connected to the audio stream (S44).

In the receiver, the LCT packet transmitted in the FLUTE session with TSI = 1, 2 in the service 1 is extracted, the main video and main audio segment data is acquired, and the main video and main audio rendering processing is performed ( S45). As a result, the main video and main audio of the service 1 are reproduced in the receiver (video IM1 on the receiver screen in FIG. 6).

Also, the receiver tries to acquire SCS metadata in parallel with the main video and main audio rendering process of service 1. That is, in the receiver, when the service ID corresponding to the channel selection operation is specified (S41), the SC bootstrap information is specified from the channel selection parameter of the channel selection information (SCD) recorded in the NVRAM. The receiver is connected to the SCS stream transmitted in the FLUTE session of TSI = 4 in the service 1 in accordance with the IP address, port number, and TSI of the SC bootstrap information (S46).

When one cycle of the SCS stream elapses after connection to the SCS stream, all SCS metadata is acquired and information for connecting to the subtitle (Caption) stream other than the main video and main audio constituting the service 1 Is obtained. The receiver is connected to the subtitle stream according to the SCS metadata (USBD, SDP, MPD, etc.) (S48). In the receiver, the LCT packet transmitted in the FLUTE session of TSI = 3 in the service 1 is extracted, caption segment data is acquired, and caption rendering processing is performed (S49).

Thus, the receiver reproduces the subtitles together with the main video and main audio of service 1 (video IM2 on the receiver screen in FIG. 6). That is, in the receiver, the subtitle CC is superimposed and displayed on the main video that has been preferentially displayed in advance.

As described above, since one cycle of the LLS stream is basically shorter than one cycle of the SCS stream, when the DCT is transmitted using the LLS stream, the DCT acquired prior to the SCS metadata can be quickly obtained. And the main video and main audio can be reproduced (video IM1 on the receiver screen in FIG. 6). At the same time, since it tries to acquire the SCS metadata transmitted in the SCS stream, after all the SCS metadata is acquired, the subtitle CC is superimposed on the previously displayed main video. (Image IM2 on the receiver screen in FIG. 6).

In this way, the main video and the main audio are played back in advance, so that the main video and main audio such as the main video and the main audio having a higher priority than the secondary information such as subtitles are reproduced. Since information can be provided preferentially, the program can be viewed without giving the user an unnatural feeling.

(2) Operation example 2: DCT is transmitted by SCS

(Channel selection processing)
FIG. 7 is a diagram for explaining a channel selection process in Operation Example 2 which is an operation of transmitting DCT by SCS. FIG. 7 schematically shows a BBP stream obtained from a digital broadcast signal transmitted from the transmitter to the receiver in order to explain the channel selection processing at the receiver. The components constituting the service, the SCS stream, the LLS stream, and the like transmitted by the BBP stream are the same as those in FIG.

Here, when the channel selection operation is performed by the user in the receiver, the service ID corresponding to the channel selection operation is specified (S61), and the channel selection parameter of the channel selection information (SCD) recorded in the NVRAM is used. The physical parameters and SC bootstrap information are specified (S62).

The receiver is connected to the BBP stream according to the frequency and the PLP ID as physical parameters (S63), and further, a FLUTE session with TSI = 3 in the service 1 according to the SC bootstrap information (IP address, port number, and TSI) (S64).

Thereby, in the receiver, the LCT packet transmitted in the FLUTE session of TSI = 3 in the service 1 is extracted (S65), and IS (Initialization Segment) is acquired therefrom (S66). In the receiver, the LCT packet transmitted in the FLUTE session with TSI = 3 in the service 1 is extracted (S67), and the DCT is acquired therefrom (S68).

The receiver acquires the DCT, so that the IP address, the port number, and the TSI for connecting to the main video and main audio stream constituting the service 1 are specified. The audio stream is connected (S69). As a result, the LCT packet transmitted in the FLUTE session with TSI = 1 in the service 1 is extracted at the receiver (S70), and the MS (Media Segment) of the main voice is obtained therefrom (S71). In the receiver, the LCT packet transmitted in the FLUTE session with TSI = 2 in the service 1 is extracted (S70), and the MS of the main video is acquired therefrom (S71).

In this way, in the receiver, the IS and MS as the segment are acquired, the segment data stored in the MS is acquired, and the main video and main audio rendering processing is performed. As a result, the main video and main audio of service 1 are reproduced in the receiver.

As described above, in the operation example 2, the DCT transmitted in the SCS stream is acquired prior to the SCS metadata such as USBD, SDP, and MPD, and is connected to the main video and main audio streams included in the DCT. The main video and main audio segment data are preferentially acquired according to the information for the main video and main audio streams, and main video and main audio rendering processing is performed.

As described above, in operation example 2, a certain amount of time is required until all components constituting service 1 other than the main video and main audio, for example, the second audio and subtitles are output. If this is allowed, the DCT is described so that the main video and the main audio are preferentially output as a minimum service, and are acquired prior to the SCS metadata. At this time, since the DCT has a data size smaller than that of the SCS metadata, the transmitter can suppress the transmission band even if the DCT transmission cycle is shorter than the transmission cycle of the SCS metadata. As a result, the receiver can immediately acquire a DCT transmitted at a transmission cycle shorter than that of the SCS metadata, and can perform high-speed channel selection processing using the DCT.

(Signaling configuration)
FIG. 8 is a diagram illustrating a configuration of signaling data in Operation Example 2 which is an operation of transmitting DCT by SCS.

In FIG. 8, LLS metadata such as SCD, EAD, and RDD is transmitted as LLS. In addition, as SCS, DCT as metadata for pre-acquisition is transmitted together with SCS metadata such as USBD, SDP, and MPD. The SCD describes physical parameters and SC bootstrap information. The receiver acquires the preceding acquisition metadata transmitted in the FLUTE session by connecting to the SCS stream in accordance with the SC bootstrap information.

DCT contains information such as port numbers and TSI as information for connecting to the main video and main audio streams that make up the service to be selected as information for selecting a minimum service. is described. In accordance with DCT, the receiver connects to the stream of main video (“Main Audio” in FIG. 8) and the main audio (“Main Audio” in FIG. 8) transmitted in the FLUTE session. Segment data is acquired and main video and main audio are rendered. As a result, the receiver reproduces the main video and main audio of the service to be selected.

In addition, the receiver tries to acquire the SCS metadata (USBD, SDP, MPD, etc.) transmitted in the FLUTE session together with the metadata for preceding acquisition in parallel with the main video and main audio rendering process. Information (IP address, port number, TSI, etc.) for connecting to the stream of the second video (“2nd Video” in FIG. 8) and the second audio (“2nd Audio” in FIG. 8) constituting the service to be selected ) To get SCS metadata.

Note that SCS metadata (for example, SPD and MPD) acquired after DCT is also connected to a stream of main video (“Main Video” in FIG. 8) and main audio (“Main Audio” in FIG. 8). Information is provided. In other words, the information for connecting to the main video and main audio streams is defined redundantly in the DCT and SCS metadata. For example, when the DCT is not transmitted in the SCS stream, etc. The receiver may use the SCS metadata and connect to the main video and main audio streams. In addition, the receiver can acquire the ESG transmitted in the FLUTE session according to the ESG bootstrap information described in the SCD.

(3) Operation example 3: Shortcut information is transmitted by LLS

(Channel selection processing)
FIG. 9 is a diagram for explaining a channel selection process of Operation Example 3 which is an operation of transmitting shortcut information by LLS. FIG. 9 schematically shows a BBP stream obtained from a digital broadcast signal transmitted from the transmitter to the receiver in order to explain the channel selection processing at the receiver. The components constituting the service, the SCS stream, the LLS stream, and the like transmitted by the BBP stream are the same as those in FIG.

Here, when the channel selection operation is performed by the user in the receiver, the service ID corresponding to the channel selection operation is specified (S81), and from the channel selection parameter of the channel selection information (SCD) recorded in the NVRAM. The physical parameters and SC bootstrap information are specified (S82).

The receiver is connected to the BBP stream according to the frequency and PLP ID as physical parameters (S83), and further, the FLUTE session with TSI = 3 in service 1 according to the SC bootstrap information (IP address, port number, and TSI) (S84). As a result, the receiver extracts the LCT packet transmitted in the FLUTE session with TSI = 3 in the service 1 (S85), and acquires IS (InitializationalSegment) from there (S86).

Also, the SCD describes the MIME type, port number, and TSI for each component as information for connecting to the main video and main audio streams constituting the service 1. That is, in the operation example 1 and operation example 2, information for selecting a minimum service in the service 1 is embedded in the SCD of FIG. 9 that is described in the DCT (preceding acquisition metadata). Yes. This information will be described as “shortcut information”.

Then, the receiver identifies the IP address, port number, and TSI for connecting to the main video and main audio stream constituting the service 1 by referring to the SCD shortcut information. Are connected to the main audio stream (S87). As a result, the LCT packet transmitted in the FLUTE session with TSI = 1 in the service 1 is extracted at the receiver (S88), and the MS (Media Segment) of the main voice is acquired therefrom (S89). In the receiver, the LCT packet transmitted in the FLUTE session with TSI = 2 in the service 1 is extracted (S88), and the MS of the main video is acquired therefrom (S89).

As described above, in the operation example 3, in accordance with the shortcut information included in the SCD transmitted in the LLS stream, the main video and main audio segment data are connected preferentially, and the main video and main audio segment data are preferentially acquired. The main video and main audio are rendered.

As described above, in the operation example 3, a certain amount of time is required until the second video, subtitles, and the like other than the main video and the main audio are output among all the components constituting the service 1. If this is allowed, the shortcut information is preceded by the SCS metadata by describing the shortcut information and including it in the SCD so that the main video and the main audio are output preferentially as a minimum service. And get it. At that time, since the shortcut information is included in the SCD as the LLS metadata and transmitted, the shortcut information can be used to perform high-speed channel selection processing.

(Signaling configuration)
FIG. 10 is a diagram illustrating a configuration of signaling data in the operation example 3 which is an operation of transmitting the shortcut information by LLS.

In FIG. 10, LLS metadata such as SCD, EAD, and RDD is transmitted as LLS. Further, as the SCS, SCS metadata such as USBD, SDP, and MPD is transmitted. In the SCD, shortcut information is described together with physical parameters and SC bootstrap information. In the shortcut information, information (port number, TSI, etc.) for connecting to the main video and main audio stream that constitutes the service to be selected is described as information for selecting the minimum service. Has been.

In accordance with the shortcut information included in the SCD, the receiver connects to the main video (“Main Video” in FIG. 10) and main audio (“Main Audio” in FIG. 10) streams transmitted in the FLUTE session. The video and main audio segment data is acquired, and the main video and main audio are rendered. As a result, the receiver reproduces the main video and main audio of the service to be selected.

In addition to the main video and main audio rendering process, the receiver tries to acquire SCS metadata (USBD, SDP, MPD, etc.) transmitted in the FLUTE session, and configures the service to be selected. SCS metadata including information (IP address, port number, TSI, etc.) for connecting to the stream of the second video (“2nd Video” in FIG. 10) and the second audio (“2nd Audio” in FIG. 10) get.

Note that SCS metadata (for example, SPD and MPD) acquired after the shortcut information is also connected to the stream of the main video (“Main Video” in FIG. 10) and the main audio (“Main Audio” in FIG. 10). Information is provided. That is, the information for connecting to the main video and main audio stream is defined redundantly in the shortcut information and the SCS metadata. For example, when the shortcut information is not included in the SCD. The receiver may use the SCS metadata and connect to the main video and main audio streams. In addition, the receiver can acquire the ESG transmitted in the FLUTE session according to the ESG bootstrap information described in the SCD.

<3. Syntax example>

(Binary DCT configuration)
FIG. 11 is a diagram illustrating an example of DCT syntax in a binary format.

∙ DCT table ID is specified in 8-bit table_id. The 8-bit version_number specifies the DCT version. The 16-bit length specifies the table length.

The 1-bit mime_flag specifies a flag indicating the presence or absence of MIME type. In 1-bit port_num_flag, a flag indicating the presence or absence of a port number is specified. In 1-bit tsi_flag, a flag indicating the presence or absence of TSI is specified. The 5-bit reserved is an area for future expansion.

In video_component, information for connecting to the main video stream as a minimum service is specified. In mime_type, when mime_flag is "TURE", an 8-bit MIME type is specified. In port_number, when port_num_flag is “TURE”, a 16-bit port number is specified. In TSI, 16-bit TSI is specified when tsi_flag is "TURE".

In audio_component, information for connecting to the main audio stream as a minimum service is specified. In mime_type, when mime_flag is "TURE", an 8-bit MIME type is specified. In port_number, when port_num_flag is “TURE”, a 16-bit port number is specified. In TSI, 16-bit TSI is specified when tsi_flag is "TURE". In video_component and audio_component, when mime_flag, port_num_flag, and tsi_flag are “FALSE”, values specified separately in operation and the like are used, so mime_type, port_number, and TSI are not transmitted. As a result, the data size of the DCT can be further reduced.

In addition, as shown in FIG. 12, a service ID can be specified by a 16-bit service_id in the binary DCT. That is, in the case of operation example 1 described above, since DCT is transmitted by LLS, it is necessary to transmit DCT for each service. In this case, the service ID is specified to identify the DCT for each service. . Therefore, when the operation example 1 is adopted, the DCT of FIG. 12 is used.

On the other hand, in the case of operation example 2 described above, since the DCT is transmitted by the SCS, it is possible to transmit the DCT of a specific service, so there is no need to specify the service ID. Therefore, when the operation example 2 is adopted, the DCT of FIG. 11 is used. Note that the configuration of the binary DCT syntax shown in FIGS. 11 and 12 is an example, and other configurations may be adopted.

(Configuration of DCT in XML format)
FIG. 13 is a diagram illustrating an example of DCT syntax in XML format.

In FIG. 13, among the elements and attributes, “@” is added to the attribute. Further, the indented element and attribute are specified for the upper element. In addition, in FIG. 13, the number of occurrences (Cardinality), but when "1" is specified, only one element or attribute is specified, and when "0..1" is specified Specifying the element or attribute is optional.

In FIG. 13, the DCD element is an upper element of the ServiceID element, the video element, and the audio element. In the ServiceID element, a service ID is specified. The service ID is an optional value and is specified in the case of operation example 1 described above, but need not be specified in the case of operation example 2.

In the video element, information for connecting to the main video stream as a minimum service is specified. The video element is an upper element of the mime_type attribute, the port_number attribute, and the TSI attribute. In the mime_type attribute, a MIME type is specified. A port number is specified in the port_number attribute. TSI is specified as the TSI attribute.

In the audio element, information for connecting to the main audio stream as a minimum service is specified. The audio element is an upper element of the mime_type attribute, the port_number attribute, and the TSI attribute. In the mime_type attribute, a MIME type is specified. A port number is specified in the port_number attribute. TSI is specified as the TSI attribute.

The configuration of the XML format DCT syntax shown in FIG. 13 is merely an example, and other configurations may be adopted.

<4. System configuration>

(Configuration example of broadcasting communication system)
FIG. 14 is a diagram illustrating a configuration of an embodiment of a broadcast communication system to which the present technology is applied.

In FIG. 14, the broadcast communication system 1 is a system that can provide various services in cooperation with broadcast and communication. Information for selecting the above-mentioned minimum service is stored in the SCS meta data. By acquiring data in advance, it is a system that can select a high-speed channel with priority on a minimum service.

The broadcast communication system 1 in FIG. 14 includes a transmission device 10, a reception device 20, a data providing server 30, and a streaming server 40. In FIG. 14, the receiving device 20 is connected to the streaming server 40 via a network 90 such as the Internet.

The transmission device 10 corresponds to the above-described transmitter (for example, FIG. 3, FIG. 7, FIG. 9, etc.), and is provided by, for example, a broadcaster. The transmission device 10 transmits component data provided from the data providing server 30 by a broadcast wave of digital broadcasting using an IP transmission method. Further, the transmission device 10 generates signaling data by using the original data of the signaling data provided from the data providing server 30 and transmits it together with component data by a broadcast wave of digital broadcasting using the IP transmission method.

When transmitting component data such as video, audio, subtitles, etc. in a FLUTE session, the file of each component is divided into segments according to the ISO BMFF (Base Media File Format), The obtained segment data is stored in an LCT packet and transmitted. This segment is composed of IS (Initialization Segment) and MS (Media Segment).

Further, when the operation example 1 described above is adopted, the prior acquisition metadata (DCT or DCD) is generated as the signaling data, and is transmitted along with the LLS metadata by the LLS. Further, when the operation example 2 described above is adopted, the metadata for pre-acquisition (DCT or DCD) is generated as signaling data, and is transmitted along with the SCS metadata through the FLUTE session in the SCS. Further, when the operation example 3 described above is adopted, an SCD including shortcut information is generated as signaling data, and is transmitted by LLS as LLS metadata.

The receiving device 20 corresponds to the above-described receiver (for example, FIG. 3, FIG. 7, FIG. 9, etc.), and is installed in each home, for example. The receiving device 20 receives a broadcast wave of a digital broadcast transmitted from the transmission device 10 and acquires signaling data transmitted by the broadcast wave of the digital broadcast. Based on the acquired signaling data, the receiving device 20 acquires component data transmitted by the broadcast wave of the digital broadcast transmitted from the transmitting device 10, and reproduces (outputs) video and audio corresponding to the data. )

The data providing server 30 provides component data such as video, audio, and subtitles to at least one of the transmission device 10 and the streaming server 40. In addition, the data providing server 30 provides the original data of the signaling data to the transmitting device 10. Note that the data providing server 30 may generate signaling data instead of the original data of the signaling data and provide it to the transmission device 10.

The streaming server 40 performs streaming distribution of the component data provided from the data providing server 30 via the network 90 in response to a request from the receiving device 20. The streaming server 40 is provided by, for example, a broadcaster. Further, the streaming server 40 may generate signaling data and distribute the signaling data via the network 90 in response to a request from the receiving device 20.

Based on the signaling data from the transmission device 10, the reception device 20 acquires component data that is streamed from the streaming server 40 via the network 90, and reproduces (outputs) video and audio corresponding to the data. To do.

The broadcast communication system 1 is configured as described above. Next, with reference to FIGS. 15 to 17, the configuration of the transmission device 10 and the reception device 20 will be described as a detailed configuration of each device configuring the broadcast communication system 1 of FIG. 14.

(Configuration example of transmitter)
FIG. 15 is a diagram illustrating a configuration of an embodiment of a transmission device to which the present technology is applied.

As illustrated in FIG. 15, the transmission device 10 includes a signaling generation unit 111, a signaling processing unit 112, a video data acquisition unit 113, a video encoder 114, an audio data acquisition unit 115, an audio encoder 116, a caption data acquisition unit 117, and a caption encoder. 118, Mux 119, and transmission unit 120.

The signaling generation unit 111 generates signaling data using the original data of the signaling data provided from the data providing server 30 and supplies it to the signaling processing unit 112. The signaling processing unit 112 processes the signaling data supplied from the signaling generation unit 111 and supplies it to the Mux 119.

Here, as signaling data, LLS metadata such as SCD, RRD, and EAD and SCS metadata such as USBD, SDP, and MPD are generated. However, when operation example 1 and operation example 2 are adopted, DCT or DCD as the prior acquisition metadata is generated. When operation example 3 is adopted, an SCD including shortcut information is generated.

The video data acquisition unit 113 acquires video data provided from the data providing server 30 and supplies the video data to the video encoder 114. Note that the video data may be acquired from a built-in storage, a video camera, or the like. The video encoder 114 encodes the video data supplied from the video data acquisition unit 113 in accordance with an encoding method such as MPEG (Moving Picture Experts Group) and supplies the encoded data to the Mux 119.

The audio data acquisition unit 115 acquires audio data provided from the data providing server 30 and supplies the audio data to the audio encoder 116. Note that the audio data may be acquired from a built-in storage, a microphone, or the like. The audio encoder 116 encodes the audio data supplied from the audio data acquisition unit 115 in accordance with an encoding method such as MPEG, and supplies the encoded audio data to the Mux 119.

The subtitle data acquisition unit 117 acquires subtitle data provided from the data providing server 30 and supplies it to the subtitle encoder 118. The caption encoder 118 encodes the caption data supplied from the caption data acquisition unit 117 in accordance with an encoding method such as MPEG, and supplies the encoded data to the Mux 119.

The Mux 119 generates a BBP stream by multiplexing the signaling data from the signaling processing unit 112, the video stream from the video encoder 114, the audio stream from the audio encoder 116, and the subtitle stream from the subtitle encoder 118. To the transmission unit 120. The transmission unit 120 transmits the BBP stream supplied from the Mux 119 via the antenna 121 as a digital broadcast signal.

When transmitting a stream of components such as video, audio, subtitles, etc. in a FLUTE session, the file of each component is divided into segments in accordance with the ISO FFFF regulations, and the segment data obtained thereby is LCT. It is stored in a packet and transmitted.

Further, when the operation example 1 described above is adopted, the metadata for pre-acquisition (DCT or DCD) is transmitted by LLS together with the LLS metadata (SCD, RRD, EAD, etc.). When the operation example 2 described above is adopted, the metadata for pre-acquisition (DCT or DCD) is transmitted through the FLUTE session in the SCS together with the SCS metadata (USBD, SDP, MPD, etc.). Furthermore, when the operation example 3 described above is adopted, the SCD including the shortcut information is transmitted by LLS as LLS metadata.

Furthermore, in digital broadcast signals, LLS headers of LLS packets that store LLS metadata (SCD, RRD, EAD, etc.) transmitted as LLS, or SCS metadata (USBD, SDP, MPD, etc.) transmitted as SCS Filtering information such as compression information (CO), type information (Type), extension filter information (Filter_Extension), or version information (Data_Version) can be arranged in the LCT header of the LCT packet in which is stored.

Here, in the compression information, information indicating whether or not the target signaling data is compressed is designated. In the type information, information indicating the type of target signaling data is specified. In the extended filter information, extended filtering information set for each type of signaling data is arbitrarily set. In the version information, information indicating the version of the target signaling data is specified. Thereby, the receiving apparatus 20 can acquire target signaling data by performing filtering processing of the LLS packet or the LCT packet using the filtering information of the LLS header or the LCT header.

(Configuration example of receiving device)
FIG. 16 is a diagram illustrating a configuration of an embodiment of a reception device to which the present technology is applied.

As illustrated in FIG. 16, the reception device 20 includes a tuner 212, a Demux 213, a control unit 214, an NVRAM 215, an input unit 216, a communication unit 217, a Demux 218, a video decoder 219, a video output unit 220, an audio decoder 221, and an audio output unit 222. , And a caption decoder 223.

The tuner 212 extracts and demodulates a digital broadcast signal corresponding to the user's channel selection operation from the broadcast wave of the digital broadcast using the IP transmission method received via the antenna 211 according to the control from the control unit 214. The resulting BBP stream is supplied to the Demux 213.

The Demux 213 separates the BBP stream supplied from the tuner 212 into video, audio, and subtitle streams and signaling data in accordance with control from the control unit 214. The Demux 213 supplies video data to the video decoder 219, audio data to the audio decoder 221, subtitle data to the subtitle decoder 223, and signaling data to the control unit 214.

The control unit 214 controls the operation of each unit of the receiving device 20. Further, the control unit 214 controls the operation of each unit in order to obtain a component stream transmitted by broadcasting or communication based on the signaling data supplied from the Demux 213. The detailed configuration of the control unit 214 will be described later with reference to FIG.

The NVRAM 215 is a non-volatile memory, and records various data according to the control from the control unit 214. The input unit 216 supplies an operation signal to the control unit 214 in accordance with a user operation.

The communication unit 217 accesses the streaming server 40 via the network 90 according to the control from the control unit 214 and requests distribution of the component stream. The communication unit 217 receives a stream of components streamed from the streaming server 40 via the network 90 and supplies the stream to the Demux 218.

In accordance with control from the control unit 214, the Demux 218 separates the component stream supplied from the communication unit 217 into video data, audio data, and subtitle data, the video data to the video decoder 219, and the audio data to the audio decoder. In 221, the caption data is supplied to the caption decoder 223.

Video data is supplied to the video decoder 219 from the Demux 213 or Demux 218. The video decoder 219 decodes video data in accordance with a decoding scheme such as MPEG in accordance with control from the control unit 214 and supplies the video data to the video output unit 220. The video output unit 220 outputs the video data supplied from the video decoder 219 to a subsequent display (not shown). Thereby, for example, the video of the program is displayed on the display.

Audio data is supplied to the audio decoder 221 from the Demux 213 or Demux 218. The audio decoder 221 decodes audio data in accordance with a decoding scheme such as MPEG in accordance with control from the control unit 214 and supplies the audio data to the audio output unit 222. The audio output unit 222 outputs the audio data supplied from the audio decoder 221 to a subsequent speaker (not shown). Thereby, for example, sound corresponding to the video of the program is output from the speaker.

Subtitle data is supplied from the Demux 213 or Demux 218 to the subtitle decoder 223. The subtitle decoder 223 decodes the subtitle data in accordance with a decoding scheme such as MPEG in accordance with the control from the control unit 214 and supplies it to the video output unit 220. The video output unit 220 synthesizes the caption data supplied from the caption decoder 223 with the video data supplied from the video decoder 219, and outputs the synthesized data to the subsequent display. Thereby, for example, the subtitle superimposed on the video of the program is displayed on the display.

Note that the receiving device 20 in FIG. 16 has a configuration in which a display and a speaker are provided outside, but the receiving device 20 may have a configuration having a display and a speaker. In this case, for example, the receiving device 20 is configured as a television receiver and is installed in each home of the user. Note that the receiving device 20 is not limited to a television receiver, and may be configured as, for example, a mobile communication terminal such as a smartphone or a mobile phone, or an information device such as a personal computer or a tablet computer.

(Functional configuration example of control unit)
FIG. 17 is a diagram illustrating a functional configuration example of a portion that controls the initial scan process, the channel selection process, the filtering process, and the communication process in the control unit 214 of FIG.

17, the control unit 214 includes a channel selection control unit 251, a packet header monitoring unit 252, a filtering control unit 253, a signaling acquisition unit 254, a signaling analysis unit 255, and a communication control unit 256.

The channel selection control unit 251 controls the channel selection process executed by the tuner 212. The filtering control unit 253 controls the filtering process executed by the Demux 213.

At the time of the initial scan processing, the channel selection control unit 251 controls the tuner 212 and the filtering control unit 253 controls the Demux 213, whereby the LLS metadata transmitted as the LLS is acquired by the signaling acquisition unit 254, and the signaling The data is supplied to the analysis unit 255. The signaling analysis unit 255 records channel selection information obtained by analyzing the LLS metadata (SCD or the like) from the signaling acquisition unit 254 in the NVRAM 215.

When the channel selection operation is performed by the user, the channel selection control unit 251 acquires the channel selection information recorded in the NVRAM 215 according to the operation signal from the input unit 216. The channel selection control unit 251 controls the channel selection process executed by the tuner 212 based on the acquired channel selection information. Further, the channel selection control unit 251 supplies the SC bootstrap information included in the channel selection information to the filtering control unit 253.

Here, when the operation example 1 described above is adopted, the signaling acquisition unit 254 acquires the DCT transmitted in the LLS stream and supplies the DCT to the signaling analysis unit 255. The signaling analysis unit 255 analyzes the DCT supplied from the signaling acquisition unit 254, and supplies the analysis result to the filtering control unit 253. As an analysis result, as information for selecting a minimum service, a port number, TSI, and the like for connecting to the main video and main audio streams constituting the service to be selected are obtained.

Further, when the operation example 2 described above is adopted, the signaling acquisition unit 254 acquires the DCT transmitted in the SCS stream and supplies the DCT to the signaling analysis unit 255. The signaling analysis unit 255 analyzes the DCT supplied from the signaling acquisition unit 254, and supplies the analysis result to the filtering control unit 253. As an analysis result, as information for selecting a minimum service, a port number, TSI, and the like for connecting to the main video and main audio streams constituting the service to be selected are obtained.

When the operation example 3 described above is adopted, the channel selection control unit 251 acquires shortcut information included in the SCD recorded in the NVRAM 215 as channel selection information, and supplies the shortcut information to the filtering control unit 253. This shortcut information includes, as information for selecting a minimum service, a port number, TSI, and the like for connecting to the main video and main audio streams constituting the service to be selected.

Then, the filtering control unit 253 uses the Demux 213 based on the analysis result (operation examples 1 and 2) supplied from the signaling analysis unit 255 or the shortcut information (operation example 3) supplied from the channel selection control unit 251. Controls the filtering process that is performed. Accordingly, in the Demux 213, when connected to the main video and main audio streams constituting the channel selection target service and the streams are transmitted in the FLUTE session, the segment data is extracted from the LCT packet. As a result, video data corresponding to the main video is supplied to the video decoder 219, and audio data corresponding to the main audio is supplied to the audio decoder 221.

Further, the filtering control unit 253 controls the filtering process executed by the Demux 213 based on the SC bootstrap information supplied from the channel selection control unit 251. Thereby, in Demux 213, when connected to the SCS stream constituting the channel selection target service and the stream is transmitted in the FLUTE session, the SCS metadata is extracted from the LCT packet. The signaling acquisition unit 254 acquires SCS metadata (USBD, SDP, MPD, etc.) and supplies it to the signaling analysis unit 255.

The signaling analysis unit 255 analyzes the SCS metadata (USBD, SDP, MPD, etc.) supplied from the signaling acquisition unit 254, and supplies the analysis result to the filtering control unit 253 or the communication control unit 256. That is, when the distribution route of the component streams constituting the channel selection service is broadcast, the signaling analysis unit 255 sets the IP address, port number, TSI, and TOI for connecting to the component streams. Specify and supply to the filtering control unit 253. Also, the signaling analysis unit 255 supplies information (for example, URL) of those acquisition destinations to the communication control unit 256 when the distribution path of the stream of the components constituting the channel selection target service is communication.

The filtering control unit 253 controls the filtering process executed by the Demux 213 based on the IP address, port number, TSI, and TOI supplied from the signaling analysis unit 255. Thereby, in Demux 213, the filtering process of an LCT packet is performed, and segment data is extracted from the LCT packet obtained thereby. The resulting video data is supplied to the video decoder 219, and the audio data is supplied to the audio decoder 221. The caption data is supplied to the caption decoder 223.

The communication control unit 256 controls the communication process executed by the communication unit 217 based on the acquisition destination information (for example, URL) supplied from the signaling analysis unit 255. As a result, the communication unit 217 receives the component stream to be streamed from the streaming server 40 via the network 90 and supplies the stream to the Demux 218. The Demux 218 supplies video data obtained from the stream supplied from the communication unit 217 to the video decoder 219, audio data to the audio decoder 221, and caption data to the caption decoder 223. When signaling data is distributed from the streaming server 40, the signaling data from the communication unit 217 is supplied to the signaling acquisition unit 254.

The packet header monitoring unit 252 monitors packets transmitted by the BBP stream in the Demux 213 and analyzes the header of the monitoring target packet. The packet header monitoring unit 252 controls the filtering control unit 253 according to the analysis result of the packet header, and the signaling acquisition unit 254 acquires the LLS metadata and the SCS metadata obtained from the packet that satisfies the specific condition. So that In this filtering process, for example, filtering is performed using at least one of compression information (CO), type information (Type), extended filter information (Filter_Extension), and version information (Data_Version) as a specific condition. .

<5. Flow of processing executed by each device>

Next, with reference to the flowcharts of FIGS. 18 to 22, a specific flow of processing executed by each device constituting the broadcast communication system 1 of FIG. 14 will be described.

(Transmission process)
First, the flow of transmission processing executed by the transmission device 10 of FIG. 14 will be described with reference to the flowchart of FIG.

In step S111, the signaling generation unit 111 generates signaling data using the original data of the signaling data provided from the data providing server 30, and supplies the signaling data to the signaling processing unit 112. In step S112, the signaling processing unit 112 processes the signaling data supplied from the signaling generation unit 111 and supplies the processed data to the Mux 119.

Here, as signaling data, LLS metadata such as SCD, RRD, and EAD and SCS metadata such as USBD, SDP, and MPD are generated. In addition, when the operation example 1 and the operation example 2 are adopted, the signaling generation unit 111 generates DCT or DCD as the advance acquisition metadata. Moreover, the signaling production | generation part 111 produces | generates SCD containing shortcut information, when the operation example 3 is employ | adopted.

However, the data providing server 30 may generate the signaling data. In that case, the signaling generation unit 111 supplies the signaling data supplied from the data providing server 30 to the signaling processing unit 112 as it is.

In step S113, the video data acquisition unit 113, the audio data acquisition unit 115, and the caption data acquisition unit 117 acquire video data, audio data, and caption data as components from the data providing server 30, and a video encoder 114, the audio encoder 116, and the caption encoder 118.

In step S <b> 114, the video encoder 114, the audio encoder 116, and the caption encoder 118 are supplied from the video data acquisition unit 113, the audio data acquisition unit 115, and the caption data acquisition unit 117. Data and caption data are encoded in accordance with an encoding method such as MPEG and supplied to Mux 119.

In step S115, the Mux 119 multiplexes the signaling data from the signaling processing unit 112, the video stream from the video encoder 114, the audio stream from the audio encoder 116, and the subtitle stream from the subtitle encoder 118 to BBP. A stream is generated and supplied to the transmission unit 120.

In step S116, the transmission unit 120 transmits the BBP stream supplied from the Mux 119 as a digital broadcast signal via the antenna 121. When the process of step S116 ends, the transmission process of FIG. 18 ends.

In the transmission process of FIG. 18, when a stream of components such as video, audio, and subtitles is transmitted in a FLUTE session, the file of each component is divided into segments according to the ISO FFFF regulations. The segment data obtained by the above is stored in an LCT packet and transmitted.

Furthermore, in digital broadcast signals, LLS headers of LLS packets that store LLS metadata (SCD, RRD, EAD, etc.) transmitted as LLS, or SCS metadata (USBD, SDP, MPD, etc.) transmitted as SCS Filtering information such as compression information (CO), type information (Type), extension filter information (Filter_Extension), and version information (Data_Version) can be arranged in the LCT header of the LCT packet in which is stored.

The transmission process has been described above.

(Initial scan processing)
Next, the flow of the initial scan process executed by the receiving device 20 of FIG. 14 will be described with reference to the flowchart of FIG.

In step S211, the operation signal from the input unit 216 is monitored by the control unit 214 and waits until an initial scan operation is performed by the user. If the user performs an initial scan operation in step S212, the process proceeds to step S213.

In step S213, the tuner 212 performs frequency scan processing according to the control from the channel selection control unit 251. In step S214, whether or not the frequency scan is successful is determined by the frequency scan process in step S213.

If it is determined in step S214 that the frequency scan has failed, the process returns to step S213, and the frequency scan process is performed again. On the other hand, if it is determined in step S214 that the frequency scan process has been successful, the process proceeds to step S215.

In step S215, the Demux 213 acquires and analyzes the BBP stream supplied from the tuner 212 according to the control from the filtering control unit 253. In step S216, it is determined whether an IP packet is extracted from the BBP stream according to the analysis result in step S215.

If it is determined in step S216 that an IP packet has been extracted, the process proceeds to step S217. In step S217, the Demux 213 discards the extracted IP packet. On the other hand, if it is determined in step S216 that a packet other than the IP packet has been extracted, the process proceeds to step S218.

In step S218, it is determined whether an LLS packet is extracted from the BBP stream according to the analysis result in step S215.

If it is determined in step S218 that a packet other than the LLS packet has been extracted, the process proceeds to step S217. In step S217, the Demux 213 discards packets other than the extracted LLS packet. On the other hand, if it is determined in step S218 that the LLS packet has been extracted, the process proceeds to step S219.

In step S219, the Demux 213 and the control unit 214 execute LLS acquisition / recording processing. In this LLS acquisition / recording process, the filtering process is performed based on the filtering information of the LLS header added to the LLS packet, and the LLS metadata (SCD or the like) acquired by the filtering process is used as the channel selection information in the NVRAM 215. To be recorded. Details of the LLS acquisition / recording process will be described later with reference to the flowchart of FIG.

When the process of step S217 or step S219 is completed, the process proceeds to step S220. In step S220, it is determined whether scanning of all frequency bands is completed.

If it is determined in step S220 that scanning of all frequency bands has not been completed, the process returns to step S213, and the processes after step S213 are repeated. Thereby, the scanning process of each frequency band is performed, and channel selection information is recorded. If it is determined in step S220 that scanning of all frequency bands has been completed, the initial scanning process in FIG. 19 is terminated.

The flow of the initial scan process has been described above.

(LLS acquisition / recording process)
Next, the detailed contents of the LLS acquisition / recording process corresponding to the process of step S219 of FIG. 19 will be described with reference to the flowchart of FIG.

In step S231, the packet header monitoring unit 252 constantly monitors the LLS packet transmitted by the BBP stream in the Demux 213, and analyzes the LLS header of the monitoring target LLS packet.

In step S232, the packet header monitoring unit 252 determines whether the types of the signaling data (LLS metadata) match according to the analysis result in step S231. That is, since the type information (Type) is arranged in the LLS header of the LLS packet, the packet header monitoring unit 252 is added with the LLS header in which the type information with Type = "1" is arranged, for example. Determine whether an LLS packet has been extracted.

In the LLS header type information (Type), a value corresponding to the type of LLS metadata is specified. For example, "1" is specified for SCD, "2" for RRD, and "3" for EAD. For all LLS metadata (SCD, RRD, EAD), “0” is specified for Type.

If it is determined in step S232 that the types of signaling data (LLS metadata) are different, the process proceeds to step S233. In step S233, the Demux 213 discards the extracted LLS packet. On the other hand, if it is determined in step S232 that the types of signaling data (LLS metadata) match, the process proceeds to step S234.

In step S234, the packet header monitoring unit 252 determines whether the target signaling data (LLS metadata) is newly acquired according to the analysis result in step S231. That is, since the version information (Data_Version) is arranged in the LLS header of the LLS packet, the packet header monitoring unit 252 extracts the LLS packet added with the LLS header in which the version information that is the latest version is arranged. Determine whether it was done.

If it is determined in step S234 that the target signaling data (LLS metadata) has been acquired, the process proceeds to step S233. In step S233, the Demux 213 discards the extracted LLS packet. On the other hand, if it is determined in step S234 that the target signaling data (LLS metadata) is newly acquired, the process proceeds to step S235.

In step S235, the packet header monitoring unit 252 performs extension filter information (Filter_Extension) processing according to the analysis result in step S231. In other words, since the extended filter information is arranged in the LLS header of the LLS packet, in this extended filter information processing, for example, an extended filter that satisfies a predetermined specific condition such as a target region or an urgency level. It is determined whether an LLS packet to which an LLS header in which information is arranged is added is extracted.

The filtering control unit 253 controls the Demux 213 in accordance with the control from the packet header monitoring unit 252, and performs filtering processing of the monitoring target LLS packet, and satisfies a specific condition among the monitoring target LLS packets. The LLS metadata obtained from the LLS packet is acquired by the signaling acquisition unit 254.

In step S236, the signaling analysis unit 255 records the signaling data (LLS metadata) acquired by the signaling acquisition unit 254 in the NVRAM 215. Thereby, the channel selection information obtained from the LLS metadata (SCD, etc.) is recorded in the NVRAM 215. When the process of step S233 or step S236 ends, the process returns to the process of step S219 in FIG. 19, and the subsequent processes are executed.

The flow of LLS acquisition / recording processing has been described above.

(Channel selection processing when DCT is transmitted by LLS)
Next, with reference to the flowchart of FIG. 21, the flow of the channel selection process when the DCT executed by the reception device 20 of FIG. 14 is transmitted by LLS will be described. Note that the channel selection processing when DCT is transmitted by LLS is processing corresponding to the operation example 1 described above.

In step S251, the channel selection control unit 251 monitors the operation signal from the input unit 216, and waits until the channel selection operation is performed by the user. If the channel selection operation is performed by the user in step S252, the process proceeds to step S253. In step S253, the channel selection control unit 251 acquires a service ID corresponding to the user's channel selection operation.

In step S254, it is determined whether the channel selection information has been acquired and recorded in the NVRAM 215. If it is determined in step S254 that channel selection information has not been acquired, the process proceeds to step S255. In step S255, the LLS metadata transmitted in the LLS stream is acquired by the signaling acquisition unit 254, and the tuning information is acquired by analyzing the LLS metadata by the signaling analysis unit 255. The channel selection information acquired in this way is recorded in the NVRAM 215.

If it is determined in step S254 that the channel selection information has been acquired, the process of step S255 is skipped, and the process proceeds to step S256. In this case, for example, the channel selection information is recorded in advance in the NVRAM 215 by the initial scan processing of FIG.

In step S256, the channel selection control unit 251 acquires the channel selection information recorded in the NVRAM 215. Then, the channel selection control unit 251 acquires physical parameters and SC bootstrap information from the channel selection information according to the triplet including the service ID acquired in step S253. Further, the channel selection control unit 251 controls the tuner 212 according to the physical parameters. As a result, the Demux 213 is connected to the LLS stream transmitted by the BBP stream from the tuner 212 (S257).

In step S258, it is determined whether DCT is acquired from the LLS stream. If it is determined in step S258 that no DCT has been acquired from the LLS stream, the determination process in step S258 is repeated. That is, in step S258, the signaling acquisition unit 254 waits for DCT acquisition from the LLS stream, and the process proceeds to step S259.

In step S259, the signaling analysis unit 255 analyzes the DCT acquired by the signaling acquisition unit 254, and supplies the analysis result to the filtering control unit 253. Here, in DCT, as information for selecting a minimum service, information (MIME type, port) for connecting to the main video and main audio component streams constituting the service to be selected Number and TSI). As a result, an IP address, a port number, and a TSI for connecting to the main video and main audio streams constituting the channel selection target service are obtained.

In step S260, the filtering control unit 253 controls the Demux 213 according to the analysis result from the signaling analysis unit 255, and connects to the main video and main audio streams constituting the channel selection target service. When the main video and main audio streams are transmitted in the FLUTE session, segment data is extracted from the LCT packet, and the main video and main audio rendering processing is performed (S261). Thereby, in the receiving device 20, the main video and main audio of the service to be selected are reproduced (for example, video IM1 on the receiver screen in FIG. 6).

In addition, the receiving device 20 performs SCS metadata acquisition processing in parallel with the main video and main audio rendering processing of the channel selection target service. That is, the channel selection control unit 251 supplies the SC bootstrap information acquired in step S256 to the filtering control unit 253.

In step S262, the filtering control unit 253 controls the Demux 213 according to the SC bootstrap information (IP address, port number, and TSI) from the channel selection control unit 251, and connects to the SCS stream of the channel selection target service. . When the SCS metadata is transmitted in the FLUTE session, the signaling acquisition unit 254 acquires the SCS metadata from the LCT packet.

In step S263, it is determined whether all the SCS metadata has been acquired. If it is determined in step S263 that all SCS metadata has not been acquired, the process proceeds to step S264. In step S264, the signaling acquisition unit 254 acquires SCS metadata from the LCT packet. Then, until it is determined in step S263 that all the SCS metadata has been acquired, the processes in steps S263 and 264 are repeated, and all the SCS metadata such as USBD, SDP, and MPD are acquired.

In step S265, the signaling analysis unit 255 analyzes all the SCS metadata acquired by the signaling acquisition unit 254. In step S266, the signaling analysis unit 255 determines whether there is a component to be output, other than the main video and main audio, according to the analysis result in step S265. If it is determined in step S266 that there is a component to be output, the process proceeds to step S267. In this case, the signaling analysis unit 255 supplies the analysis result of step S265 to the filtering control unit 253.

In step S267, the filtering control unit 253 controls the Demux 213 according to the analysis result from the signaling analysis unit 255 and connects it to the component stream to be output. If the component stream to be output is transmitted in the FLUTE session, segment data is extracted from the LCT packet, and rendering processing and the like are performed (S267).

For example, when subtitles exist as components to be output by components other than the main video and main audio, the receiving device 20 is connected to the subtitle stream according to the SCS metadata (USBD, SDP, MPD, etc.), and the LCT packet Segment data is acquired from the subtitles, and caption rendering processing and the like are performed. As a result, the receiving device 20 reproduces subtitles together with the main video and main audio of the service to be selected (video IM2 on the receiver screen in FIG. 6). That is, in the receiving device 20, the processing of steps S257 to S261 and the processing of steps S262 to S267 are executed in parallel, so that the subtitle is superimposed on the main video that has been displayed preferentially in advance. Will be displayed.

If it is determined in step S266 that there is no component to be output out of components other than the main video and main audio, the processing in step S267 is skipped. In this case, only the main video and main audio of the service to be selected are reproduced.

When the process of step S261 or step S267 is completed, the process proceeds to step S268. In step S268, it is determined whether the channel selection process has been completed. If it is determined that the channel selection process has been completed, the channel selection process in the case of transmitting the DCT of FIG. 21 using LLS is terminated.

The flow of channel selection processing when DCT is transmitted using LLS has been described above. In this channel selection process, the DCT transmitted in the LLS stream is acquired prior to the SCS metadata (USBD, SDP, MPD, etc.), and is used to connect to the main video and main audio streams included in the DCT. In accordance with the information, the main video and main audio streams of the service to be selected are connected, and the main video and main audio are rendered. At that time, since the DCT acquired prior to the SCS metadata can be acquired quickly, as a result, high-speed channel selection processing can be performed.

(Channel selection processing when DCT is transmitted by SCS)
Next, with reference to the flowchart of FIG. 22, the flow of the channel selection process when the DCT executed by the receiving device 20 of FIG. 14 is transmitted by SCS will be described. Note that the channel selection processing when DCT is transmitted by SCS is processing corresponding to the operation example 2 described above.

In steps S281 to S286, the channel selection information recorded in the NVRAM 253 is acquired according to the channel selection operation by the user, as in steps S251 to S256 of FIG. This channel selection information includes physical parameters and SC bootstrap information. The channel selection control unit 251 supplies the SC bootstrap information acquired in step S286 to the filtering control unit 253.

In step S287, the filtering control unit 253 controls the Demux 213 in accordance with the SC bootstrap information (IP address, port number, and TSI) from the channel selection control unit 251, and connects to the SCS stream of the channel selection target service. . When the SCS metadata is transmitted in the FLUTE session, SCS metadata (USBD, SDP, MPD, etc.) or advance acquisition metadata (DCT) is stored in the LCT packet.

In step S288, it is determined whether the DCT stored in the LCT packet or SCS metadata such as USBD, SDP, and MPD. If it is determined in step S288 that DCT is stored in the LCT packet, the process proceeds to step S289.

In step S289, the signaling analysis unit 255 analyzes the DCT acquired by the signaling acquisition unit 254, and supplies the analysis result to the filtering control unit 253. Here, in DCT, as information for selecting a minimum service, information (MIME type, port) for connecting to the main video and main audio component streams constituting the service to be selected Number and TSI). As a result, an IP address, a port number, and a TSI for connecting to the main video and main audio streams constituting the channel selection target service are obtained.

In step S290, the filtering control unit 253 controls the Demux 213 according to the analysis result from the signaling analysis unit 255, and connects to the main video and main audio streams constituting the channel selection target service. When the main video and main audio streams are transmitted in the FLUTE session, the segment data is extracted from the LCT packet, and the main video and main audio rendering processing is performed (S291). Thereby, in the receiving device 20, the main video and main audio of the service to be selected are reproduced (for example, video IM1 on the receiver screen in FIG. 6).

If it is determined in step S288 that SCS metadata other than DCT is stored in the LCT packet, the process proceeds to step S292. In step S292, it is determined whether all the SCS metadata has been acquired. If it is determined in step S292 that all the SCS metadata has not been acquired, the process returns to step S288. Then, until it is determined in step S292 that all the SCS metadata has been acquired, the processes in steps S288 and S292 are repeated, and all the SCS metadata such as USBD, SDP, and MPD are acquired.

In step S293, the signaling analysis unit 255 analyzes all the SCS metadata acquired by the signaling acquisition unit 254. In step S294, the signaling analysis unit 255 determines whether there is a component to be output, other than the main video and main audio, according to the analysis result in step S293. If it is determined in step S294 that there is a component to be output, the process proceeds to step S295. In this case, the signaling analysis unit 255 supplies the analysis result of step S293 to the filtering control unit 253.

In step S295, the filtering control unit 253 controls the Demux 213 according to the analysis result from the signaling analysis unit 255 and connects it to the component stream to be output. When the component stream to be output is transmitted in the FLUTE session, segment data is extracted from the LCT packet, and rendering processing and the like are performed (S295).

For example, when subtitles exist as components to be output by components other than the main video and main audio, the receiving device 20 is connected to the subtitle stream according to the SCS metadata (USBD, SDP, MPD, etc.), and the LCT packet Segment data is acquired from the subtitles, and caption rendering processing and the like are performed. As a result, the receiving device 20 reproduces subtitles together with the main video and main audio of the service to be selected (video IM2 on the receiver screen in FIG. 6). That is, in the receiving device 20, the processing of steps S289 to S291 and the processing of steps S292 to S295 are performed in parallel, so that the subtitle is superimposed on the main video that has been displayed preferentially in advance. Will be displayed.

If it is determined in step S294 that there is no component to be output out of components other than the main video and main audio, the processing in step S295 is skipped. In this case, only the main video and main audio of the service to be selected are reproduced.

When the process of step S291 or step S295 ends, the process proceeds to step S296. In step S296, it is determined whether the channel selection process has been completed. If it is determined that the channel selection process has been completed, the channel selection process in the case of transmitting the DCT of FIG. 22 using the SCS is completed.

The flow of channel selection processing when DCT is transmitted by SCS has been described above. In this channel selection process, the DCT transmitted in the SCS stream is acquired prior to the SCS metadata (USBD, SDP, MPD, etc.), and is used to connect to the main video and main audio streams included in the DCT. In accordance with the information, the main video and the main audio are connected to the stream, and the main video and the main audio are rendered. At that time, since the DCT acquired prior to the SCS metadata can be acquired quickly, as a result, high-speed channel selection processing can be performed.

<6. Computer configuration>

The series of processes described above can be executed by hardware or software. When a series of processing is executed by software, a program constituting the software is installed in the computer. FIG. 23 is a diagram illustrating a configuration example of hardware of a computer that executes the above-described series of processing by a program.

In the computer 900, a CPU (Central Processing Unit) 901, a ROM (Read Only Memory) 902, and a RAM (Random Access Memory) 903 are connected to each other by a bus 904. An input / output interface 905 is further connected to the bus 904. An input unit 906, an output unit 907, a recording unit 908, a communication unit 909, and a drive 910 are connected to the input / output interface 905.

The input unit 906 includes a keyboard, a mouse, a microphone, and the like. The output unit 907 includes a display, a speaker, and the like. The recording unit 908 includes a hard disk, a nonvolatile memory, and the like. The communication unit 909 includes a network interface or the like. The drive 910 drives a removable medium 911 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.

In the computer 900 configured as described above, the CPU 901 loads the program stored in the ROM 902 or the recording unit 908 to the RAM 903 via the input / output interface 905 and the bus 904 and executes the program. A series of processing is performed.

The program executed by the computer 900 (CPU 901) can be provided by being recorded on a removable medium 911 as a package medium, for example. The program can be provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.

In the computer 900, the program can be installed in the recording unit 908 via the input / output interface 905 by installing the removable medium 911 in the drive 910. Further, the program can be received by the communication unit 909 via a wired or wireless transmission medium and installed in the recording unit 908. In addition, the program can be installed in the ROM 902 or the recording unit 908 in advance.

Here, in the present specification, the processing performed by the computer according to the program does not necessarily have to be performed in chronological order in the order described as the flowchart. That is, the processing performed by the computer according to the program includes processing executed in parallel or individually (for example, parallel processing or object processing). The program may be processed by a single computer (processor) or may be distributedly processed by a plurality of computers.

Note that the embodiments of the present technology are not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present technology.

Also, the present technology can take the following configurations.

(1)
A channel selection control unit that performs channel selection control for selecting digital broadcasting using an IP (Internet Protocol) transmission method;
In the digital broadcast, the first metadata in text format including control information for each service identified by an IP address, transmitted in a first layer higher than the IP layer in the protocol layer of the IP transmission method A metadata acquisition unit for acquiring second metadata in text format or binary format including control information for selecting a minimum service;
And a selection control unit configured to perform selection control of a stream of components constituting a minimum service based on the acquired second metadata.
(2)
The data size of the second metadata is smaller than the data size of the first metadata,
The receiving apparatus according to (1), wherein a transmission cycle of the second metadata is shorter than a transmission cycle of the first metadata.
(3)
The receiving device according to (1) or (2), wherein the metadata acquisition unit acquires the first metadata in parallel with the acquisition of the second metadata.
(4)
The reception apparatus according to any one of (1) to (3), wherein the minimum service includes a main video component and a main audio component.
(5)
The second metadata is transmitted in the second layer lower than the IP layer in the protocol layer of the IP transmission method together with the third metadata in the text format including the control information independent of the service. (1) The receiving device according to any one of (4).
(6)
The receiving apparatus according to any one of (1) to (4), wherein the second metadata is transmitted together with the first metadata in the first layer.
(7)
The second metadata is a third metadata in text format including control information independent of the service, transmitted in a second layer lower than the IP layer in the protocol layer of the IP transmission method. The receiving device according to any one of (1) to (4).
(8)
In the receiving method of the receiving device,
The receiving device is
Performs channel selection control to select digital broadcasting using the IP transmission method,
In the digital broadcast, the first metadata in text format including control information for each service identified by an IP address, transmitted in a first layer higher than the IP layer in the protocol layer of the IP transmission method Prior to, obtaining second metadata in text format or binary format including control information for selecting a minimum service;
A receiving method including a step of performing selection control of a stream of a component constituting a minimum service based on the acquired second metadata.
(9)
An acquisition unit for acquiring components constituting a service identified by an IP address in digital broadcasting using an IP transmission method;
To select first metadata in text format including control information for each service, which is transmitted in a first layer higher than the IP layer in the protocol layer of the IP transmission method, and a minimum service A generating unit that generates second metadata in text format or binary format including the control information;
The IP transmission of the first metadata and the second metadata together with the stream of components so that the second metadata is acquired prior to the first metadata in the receiving device. A transmission device comprising: a transmission unit configured to transmit by digital broadcasting using a method.
(10)
The data size of the second metadata is smaller than the data size of the first metadata,
The transmission apparatus according to (9), wherein a transmission cycle of the second metadata is shorter than a transmission cycle of the first metadata.
(11)
The transmission apparatus according to (9) or (10), wherein the minimum service includes components of main video and main audio.
(12)
The second metadata is transmitted in the second layer lower than the IP layer in the protocol layer of the IP transmission method together with the third metadata in the text format including the control information independent of the service. (9) The transmission device according to any one of (11).
(13)
The transmission device according to any one of (9) to (11), wherein the second metadata is transmitted together with the first metadata in the first layer.
(14)
The second metadata is a third metadata in text format including control information independent of the service, transmitted in a second layer lower than the IP layer in the protocol layer of the IP transmission method. The transmission device according to any one of (9) to (11).
(15)
In the transmission method of the transmission device,
The transmitting device is
In digital broadcasting using the IP transmission method, acquire the components that make up the service identified by the IP address,
To select first metadata in text format including control information for each service, which is transmitted in a first layer higher than the IP layer in the protocol layer of the IP transmission method, and a minimum service Generating second metadata in text format or binary format including the control information of
The IP transmission of the first metadata and the second metadata together with the stream of components so that the second metadata is acquired prior to the first metadata in the receiving device. A transmission method including a step of transmitting by digital broadcasting using a method.

1 broadcasting communication system, 10 transmitting device, 20 receiving device, 30 data providing server, 40 streaming server, 111 signaling generation unit, 112 signaling processing unit, 113 video data acquisition unit, 115 audio data acquisition unit, 117 subtitle data acquisition unit, 120 transmission unit, 212 tuner, 214 control unit, 215 NVRAM, 216 input unit, 217 communication unit, 220 video output unit, 222 audio output unit, 251 channel selection control unit, 252 packet header monitoring unit, 253 filtering control unit, 254 Signaling acquisition unit, 255 signaling analysis unit, 256 communication control unit, 90 network, 900 computer, 901 CPU

Claims

A channel selection control unit that performs channel selection control for selecting digital broadcasting using an IP (Internet Protocol) transmission method;
In the digital broadcast, the first metadata in text format including control information for each service identified by an IP address, transmitted in a first layer higher than the IP layer in the protocol layer of the IP transmission method A metadata acquisition unit for acquiring second metadata in text format or binary format including control information for selecting a minimum service;
And a selection control unit configured to perform selection control of a stream of components constituting a minimum service based on the acquired second metadata.
The data size of the second metadata is smaller than the data size of the first metadata,
The receiving apparatus according to claim 1, wherein a transmission cycle of the second metadata is shorter than a transmission cycle of the first metadata.
The receiving device according to claim 2, wherein the metadata acquisition unit acquires the first metadata in parallel with the acquisition of the second metadata.
The receiving apparatus according to claim 3, wherein the minimum service is composed of main video and main audio components.
The second metadata is transmitted in the second layer lower than the IP layer in the protocol layer of the IP transmission method together with the third metadata in the text format including the control information independent of the service. The receiving device according to claim 4.
The receiving device according to claim 4, wherein the second metadata is transmitted together with the first metadata in the first layer.
The second metadata is a third metadata in text format including control information independent of the service, transmitted in a second layer lower than the IP layer in the protocol layer of the IP transmission method. The receiving device according to claim 4.
In the receiving method of the receiving device,
The receiving device is
Performs channel selection control to select digital broadcasting using the IP transmission method,
In the digital broadcast, the first metadata in text format including control information for each service identified by an IP address, transmitted in a first layer higher than the IP layer in the protocol layer of the IP transmission method Prior to, obtaining second metadata in text format or binary format including control information for selecting a minimum service;
A receiving method including a step of performing selection control of a stream of a component constituting a minimum service based on the acquired second metadata.
An acquisition unit for acquiring components constituting a service identified by an IP address in digital broadcasting using an IP transmission method;
To select first metadata in text format including control information for each service, which is transmitted in a first layer higher than the IP layer in the protocol layer of the IP transmission method, and a minimum service A generating unit that generates second metadata in text format or binary format including the control information;
The IP transmission of the first metadata and the second metadata together with the stream of components so that the second metadata is acquired prior to the first metadata in the receiving device. A transmission device comprising: a transmission unit configured to transmit by digital broadcasting using a method.
The data size of the second metadata is smaller than the data size of the first metadata,
The transmission device according to claim 9, wherein a transmission cycle of the second metadata is shorter than a transmission cycle of the first metadata.
The transmission apparatus according to claim 10, wherein the minimum service includes a main video component and a main audio component.
The second metadata is transmitted in the second layer lower than the IP layer in the protocol layer of the IP transmission method together with the third metadata in the text format including the control information independent of the service. The transmission device according to claim 11.
The transmission apparatus according to claim 11, wherein the second metadata is transmitted together with the first metadata in the first hierarchy.
The second metadata is a third metadata in text format including control information independent of the service, transmitted in a second layer lower than the IP layer in the protocol layer of the IP transmission method. The transmission device according to claim 11 included.
In the transmission method of the transmission device,
The transmitting device is
In digital broadcasting using the IP transmission method, acquire the components that make up the service identified by the IP address,
To select first metadata in text format including control information for each service, which is transmitted in a first layer higher than the IP layer in the protocol layer of the IP transmission method, and a minimum service Generating second metadata in text format or binary format including the control information of
The IP transmission of the first metadata and the second metadata together with the stream of components so that the second metadata is acquired prior to the first metadata in the receiving device. A transmission method including a step of transmitting by digital broadcasting using a method.