WO2016045209A1

WO2016045209A1 - Program switching method, device and terminal

Info

Publication number: WO2016045209A1
Application number: PCT/CN2014/094152
Authority: WO
Inventors: 林铠鹏; 江楚发; 苏志辉; 杨慧
Original assignee: 深圳国微技术有限公司
Priority date: 2014-09-28
Filing date: 2014-12-18
Publication date: 2016-03-31
Also published as: CN104270667A

Abstract

The present invention is suitable for the field of televisions. Provided is a program switching method, comprising the following steps: receiving a current program transport stream, and obtaining current program audio and video type information and transport identification information of current program transport stream audio and video data; when it is determined that the current program audio and video type information is the same as a previous program audio and video type information, replacing the transport identification information of the current program transport audio and video data with the transport identification information of the previous program transport audio and video data, replacing program map information of the current program with program map information of the previous program, and transporting the current program transport stream, with the transport identification information and the program map information thereof replaced, to a media player for playing the same. The program switching method provided in an embodiment of the present invention can directly play the current audio and video program without resetting the media player, such that a time for initializing a decoder is saved, thus shortening program switching time.

Description

Program switching method, device and terminal

Technical field

The invention belongs to the field of television, and in particular relates to a program switching method, device and terminal.

Background technique

The most widely used and most common application for digital image communication is the digital television broadcasting system, and the corresponding DVB (Digital Video) The establishment of the Broadcasting (Digital Video Broadcasting) standard has accelerated the large-scale application of digital television broadcasting devices. The DVB standard encodes a source to form a TS stream (Transport) Stream, transport stream), and then multiple TS streams are multiplexed to form MPTS (Multi-program transport Stream, multi-program transport stream), and then transmitted through different media such as satellite and cable TV.

With the popularity of smart terminals, there is now a growing need to play digital video broadcast programs through a universal media player installed on a smart terminal system, such as the Android system. Since digital video broadcast programs contain different audio and video program types, audio and video types for different audio and video programs, and PMT (program) Map table, program map table) flag code transfer packet PID (packet ID The dentifier, the code code transmission package) is not the same. Every time you switch audio and video programs, you need to reset the media player, that is, re-send the current SPTS (single program transport). Stream, single program transport stream) PAT is extracted from the TS packet with PID 0x0 (program association Table, program association table), according to the current SPTS found in the PAT, the current program PMT is transmitted. The code code transmits the package PID, extracts the program PMT from the SPTS, analyzes the PMT, and acquires the current program audio and video ES (elementary) Stream, elementary stream) The data tag code conveys the packet PID and the type of audio and video format, which in turn initializes the decoder.

Since the initialization of the decoder often takes a few seconds and takes a long time, the time for program switching in the existing digital television broadcasting system is greatly increased, resulting in a long program switching time.

Technical solution

Embodiments of the present invention provide a program switching method to shorten a program switching time in a digital television broadcasting system.

The invention provides a program switching method, comprising the following steps:

Receiving a current program delivery stream, acquiring current program audio and video type information, and transmitting identification information of the current program delivery stream audio and video data;

Determining whether the current program audio and video type information is the same as the previous program audio and video type information;

When it is judged that the current program audio and video type information is the same as the previous program audio and video type information, the transmission identification information of the current program transmission audio and video data is replaced with the transmission identification information of the previous program transmission audio and video data, The program map information of a program replaces the program map information of the current program, and the current program transport stream replaced by the transfer identifier information and the program map information is transmitted to the media player for playback.

The invention also provides a program switching device, comprising:

And a transport stream converting unit, configured to convert the multi-program program stream provided by the broadcast television network into a single program program stream of the current program.

a data acquisition unit, receiving the current program delivery stream, acquiring current program audio and video type information, and transmitting identification information of the current program delivery stream audio and video data;

a program mapping information acquiring unit, which acquires program mapping information of the previous section;

a program type information comparison unit for determining whether the current program audio and video type information is the same as the previous program audio and video type information;

The transport stream processing unit, when determining that the current program audio and video type information is the same as the previous program audio and video type information, replacing the transmission identification information of the current program transmission audio and video data with the transmission of the previous program transmission audio and video data The identification information is replaced with the program mapping information of the current program by the program mapping information of the previous section, and the current program delivery stream replaced by the transmission identification information and the program mapping information is transmitted to the media player for playing.

The present invention further provides a terminal, including a communication interface, an input device, and an output device, wherein the terminal further includes a program switching device, and the program switching device is connected to the input device and the output device through a communication interface. The program switching device includes:

The method for program switching provided by the embodiment of the present invention replaces the transmission identification information of the current program transmission audio and video data with the transmission identifier of the previous program transmission audio and video data when determining that the current program type is the same as the previous program type. Information, replacing the program mapping information of the current program with the program mapping information of the previous section, and transmitting the current program delivery stream replaced by the transmission identification information and the program mapping information to the media player for playing, so that the current program transmits the audio and video data. The transmission identification information and the program mapping information of the current program are the same as the transmission identification information of the previous program transmission audio and video data and the program mapping information of the previous program, so that the current audio and video programs can be directly played without resetting the media player. It saves time for initializing the decoder and shortens the program switching time.

DRAWINGS

1 is a flowchart of implementing a program switching method according to Embodiment 1 of the present invention;

2 is a flowchart of implementing a program switching method according to Embodiment 2 of the present invention;

3 is a schematic structural diagram of a program switching apparatus according to Embodiment 3 of the present invention;

FIG. 4 is a schematic structural diagram of a terminal according to Embodiment 4 of the present invention.

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The audio and video program switching method provided by the embodiment of the present invention, when determining that the current program type is the same as the previous program type, causes the current program to transmit the transmission identification information of the audio and video data and the program mapping information of the current program by the alternative manner. It is the same as the transmission identification information of the previous program to transmit audio and video data and the program mapping information of the previous section, so the current audio and video programs can be directly played without resetting the media player, saving the time for initializing the decoder and shortening the program. Switch time.

FIG. 1 is a flowchart showing an implementation process of a program switching method according to Embodiment 1 of the present invention, which is described in detail as follows:

In step S101, the current program delivery stream is received, the current program audio and video type information, and the transmission identification information of the current program delivery stream audio and video data are acquired.

In the embodiment of the present invention, the current program audio and video type information may be obtained from a digital television signal during a search process, or may be obtained by parsing from a current program delivery stream.

As an embodiment of the present invention, the transmission identification information is a flag code transmission packet PID.

In the embodiment of the present invention, the identifier code transmission packet PID of the current program delivery stream audio and video data may be obtained from the digital television signal during the search process, or may be obtained by parsing from the current program transmission stream.

In the embodiment of the present invention, the audio type information includes but is not limited to ISO/IEC 11172 Audio, ISO/IEC 13818-3 Audio, AAC, AC3.

In the embodiment of the present invention, the video type information includes but is not limited to ISO/IEC 11172 Video, ISO/IEC 13818-2 Video, H264, H265, AVS, AVS+.

In step S102, it is determined whether the current program audio and video type information is the same as the previous program audio and video type information. If the determination result is yes, the process proceeds to step S103; if the determination result is negative, the process proceeds to step S104.

In the embodiment of the present invention, the previous program audio and video type information is obtained from the digital television signal during the search process or is parsed from the previous program transmission stream.

In step S103, the transmission identification information of the current program transmission audio and video data is replaced with the transmission identification information of the previous program transmission audio and video data, and the program mapping information of the current program is replaced with the program mapping information of the previous section, and The current program delivery stream replaced by the transmission identification information and the program mapping information is transmitted to the media player for playback.

In the embodiment of the present invention, when the transmission identification information is the identification code transmission packet PID, the identification code transmission packet PID is obtained from the digital television signal during the search process or is parsed from the previous program transmission stream.

As an embodiment of the present invention, the program map information is a program map table PMT.

In the embodiment of the present invention, when the program mapping information is the program mapping table PMT, replacing the program mapping table PMT of the current program with the program mapping table PMT of the previous section specifically includes the following steps:

Encapsulating the program listing table PMT of the previous section into one or more transport packets;

Since each transport packet can only transmit a maximum of 188 bytes, for a program map PMT containing more than 188 bytes, the program map table PMT can be packaged into a plurality of transport packets.

The transport packet of the program map PMT of the current program is replaced with the transport packet of the program map PMT of the previous section.

Since the transport packet of the program map PMT of the current program is repeated and continuously transmitted, the transport packet of the program map PMT of the current program is replaced with the transport packet of the program map PMT of the previous section as a loop process.

In step S104, the current program transmission stream is output to the media player for playback.

In the DVB program system, the program audio and video types are often the same. The program switching method provided by the embodiment of the present invention transmits the stream audio and current when the current program audio and video type is the same as the previous program audio and video type. The code code transmission packet PID of the video data is replaced with the flag code transmission packet PID of the previous program transmission stream audio and video data, and the program map PMT of the current program is replaced with the program map PMT of the previous section, and transmitted to the media player. So that the media player plays the current program transport stream that has been replaced by the code code transport packet PID and the program map table PMT. Since the current program transmits the audio code and the data code, the code code transport packet PID, PMT and the current program of the previous program are transmitted. The code code transmission package PID of the audio and video data is the same as the program mapping table PMT, and the current audio and video programs can be directly played without resetting the media player, saving the time for the media player to reset, and realizing the audio and video programs quickly. Switch.

It will be understood by those skilled in the art that all or part of the steps of the foregoing embodiments may be implemented by a program to instruct related hardware, and the program may be stored in a computer readable storage medium. Storage media, such as ROM/RAM, disk, CD, flash drive, etc.

FIG. 2 is a flowchart showing an implementation process of a program switching method according to Embodiment 2 of the present invention, which is described in detail as follows:

The difference from the first embodiment is that, before the step S101, the method further includes:

Step S201, converting the multi-channel program delivery stream provided by the broadcast television network into a single-channel program transmission stream of the current program.

In the embodiment of the present invention, since the video stream provided by the broadcast television network is a multi-channel program transport stream, and the current program transport stream played by the smart terminal is a single-channel program transport stream, it is required to transmit the multi-channel program provided by the broadcast television network. The stream is converted to the current program delivery stream for the media player of the smart terminal to play.

As an embodiment of the present invention, a multi-channel program delivery stream provided by a broadcast television system is converted into a current program single-channel program transmission stream by the following method:

And filtering the multi-program transmission stream to output the program association table PAT and the program mapping table PMT, and corresponding audio and video data of the current program according to the program selection instruction carrying the current program identification information;

Updating the program association table PAT and the program map table PMT to the one-way program association table PAT and the program map table PMT, and the single-channel program association table PAT , program map PMT and audio and video data output. The one-way program association table PAT, the program map table PMT, and the audio and video data are the current program transport streams.

Before step S102, the method further includes:

Step S202, acquiring program mapping information of the previous section.

In the embodiment of the present invention, when the program mapping information is the program mapping table PMT, the program link table PMT of the previous section is directly extracted in the previous program transmission stream, or audio and video according to the previous section. The type information, as well as the signature transmission packet PID reconstruction of the previous program transport stream audio and video data.

FIG. 3 shows the structure of a program switching apparatus according to an embodiment of the present invention. For the convenience of description, only parts related to the embodiment of the present invention are shown. The device may be a software unit of a conditional receiver or a smart terminal device, a hardware unit or a unit of soft and hard combination.

The program switching device 10 includes:

The transport stream converting unit 11 converts the multi-channel program transport stream provided by the broadcast television network into a one-way program transport stream of the current program.

The data obtaining unit 12 receives the current program delivery stream, acquires current program audio and video type information, and transmission identification information of the current program delivery stream audio and video data;

The program mapping information acquiring unit 13 acquires program mapping information of the previous section;

The program type information comparison unit 14 determines whether the current program audio and video type information is identical to the previous program audio and video type information;

The transport stream processing unit 15 replaces the transmission identification information of the current program transmission audio and video data with the previous program transmission audio and video data when it is judged that the current program audio and video type information is the same as the previous program audio and video type information. The identification information is transmitted, the program mapping information of the current program is replaced with the program mapping information of the previous section, and the current program delivery stream replaced by the transmission identification information and the program mapping information is transmitted to the media player for playback.

In the embodiment of the present invention, the transmission identification information is a flag code transmission packet PID, and the program mapping information is a program mapping table PMT.

In the embodiment of the present invention, when the transmission identifier information is the identifier code transmission packet PID, the data acquisition unit 12 includes:

The search data acquisition unit 121 acquires the current program audio and video type information and the flag code transmission package PID of the current program delivery stream audio and video data from the digital television signal during the search process; or

The parsing data obtaining unit 122 parses and retrieves the current program audio and video type information and the flag code transport packet PID of the current program transport stream audio and video data from the current program transport stream.

In practical applications, at least one of the search data acquisition unit 121 or the analysis data acquisition unit 122 may be present.

In the embodiment of the present invention, when the program mapping information is the program mapping table PMT, the program mapping information acquiring unit 13 includes:

The PMT extracting unit 131 is configured to directly extract the program map PMT of the previous section in the previous program transport stream; or

The PMT reconstruction unit 132 is configured to reconstruct the program link table PMT of the previous section according to the audio and video type information of the previous section and the identifier transmission packet PID of the previous program transmission stream audio and video data.

In practical applications, at least one of the PMT extraction unit 131 or the PMT reconstruction unit 132 may be present.

In the embodiment of the present invention, when the program mapping information is the program mapping table PMT, the transport stream processing unit 15 includes:

The PMT encapsulating unit 151 encapsulates the PID code packet of the previous section into at least one transport packet;

The PMT replacement unit 152 replaces the transport packet of the program map PMT of the current program with the transport packet of the program map PMT of the previous section.

In the DVB program system, the program audio and video types are often the same. The program switching apparatus provided by the embodiment of the present invention transmits the stream audio and current when the current program audio and video type is the same as the previous program audio and video type. The code code transmission packet PID of the video data is replaced with the flag code transmission packet PID of the previous program transmission stream audio and video data, and the program map PMT of the current program is replaced with the program map PMT of the previous section, and transmitted to the media player. So that the media player plays the current program transport stream that has been replaced by the code code transport packet PID and the program map table PMT. Since the current program transmits the audio code and the data code, the code code transport packet PID, PMT and the current program of the previous program are transmitted. The code code transmission package PID of the audio and video data is the same as the program mapping table PMT, and the current audio and video programs can be directly played without resetting the media player, saving the time for the media player to reset, and realizing the audio and video programs quickly. Switch.

FIG. 4 shows the structure of a terminal provided by an embodiment of the present invention. For the convenience of description, only parts related to the embodiment of the present invention are shown.

The terminal includes:

The program switching device 10 is connected to the communication interface 20 and includes:

The communication interface 20 is connected to the program switching device 10, the input device 30, and the output device 40, respectively, to implement data communication between the program switching device 10 and other devices such as the input device 30 and the output device 40.

The input device 30 is connected to the communication interface 20, receives a play command of the user, and transmits it to the communication interface 20. In the embodiment of the present invention, the input device 30 includes, but is not limited to, a button, a mouse, a keyboard remote controller, and the like.

The output device 40 is connected to the communication interface 20, and receives and outputs a digital television signal transmitted by the communication interface 20 and processed by the program switching device 10. In the embodiment of the present invention, the output device 40 includes, but is not limited to, a player, a display screen, a speaker, and the like.

In the embodiment of the present invention, the terminal includes, but is not limited to, a smart TV, a conditional receiver, a network box, and the like.

The terminal provided by the embodiment of the present invention replaces the identifier code transmission packet PID of the current program delivery stream audio and video data with the previous program delivery stream audio when determining that the current program audio and video type is the same as the previous program audio and video type. And the code data transmission package PID of the video data, replaces the program map PMT of the current program with the program map PMT of the previous section, and transmits it to the media player, so that the media player transmits the package PID and the program map to the flag code. The current program transport stream replaced by the table PMT is played, and the flag code transport packet PID, PMT of the current program transmitting audio and video data is the same as the code code transport packet PID of the current program transmitting audio and video data of the previous program, and the program map PMT. The current audio and video programs can be directly played without resetting the media player, saving the time for the media player to reset, and enabling fast switching of audio and video programs.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

A program switching method, characterized in that the method comprises the following steps:

Receiving a current program delivery stream, acquiring current program audio and video type information, and transmitting identification information of the current program delivery stream audio and video data;

Determining whether the current program audio and video type information is the same as the previous program audio and video type information;

When it is judged that the current program audio and video type information is the same as the previous program audio and video type information, the transmission identification information of the current program transmission audio and video data is replaced with the transmission identification information of the previous program transmission audio and video data, The program map information of a program replaces the program map information of the current program, and the current program transport stream replaced by the transfer identifier information and the program map information is transmitted to the media player for playback.
The method of claim 1 further comprising: before receiving the current program delivery stream, further comprising:

The multi-channel program delivery stream provided by the broadcast television network is converted into a single program transmission stream of the current program.
The method according to claim 1, wherein the transmission identification information of the current program transmission audio and video data is replaced with the transmission identification information of the previous program transmission audio and video data, and is replaced by the program mapping information of the previous section. Before the program mapping information of the current program and the current program delivery stream replaced by the transmission identification information and the program mapping information are transmitted to the media player for playing, the method further includes:

Get the program map information of the previous section.
The method according to claim 1, 2 or 3, wherein said transmission identification information is a flag code transmission packet PID, and said program mapping information is a program map table PMT.
The method of claim 4 wherein:

The current program audio and video type information is obtained from the digital television signal during the search process, or is parsed from the current program delivery stream;

The current code transmission stream audio and video data tag code transmission packet PID is obtained from the digital television signal during the search process, or is parsed from the current program transmission stream.
The method of claim 4 wherein:

The program map PMT of the previous section is obtained by directly extracting in the previous program transport stream, or according to the audio and video type information of the previous section, and the flag code transmission package of the previous program transport stream audio and video data. PID reconstruction obtained.
The method of claim 4, wherein replacing the program map PMT of the current program with the program map PMT of the previous section specifically comprises the following steps:

Encapsulating the program listing table PMT of the previous section into at least one transport packet;

The transport packet of the program map PMT of the current program is replaced with the transport packet of the program map PMT of the previous section.
A program switching device, characterized in that the device comprises:

And a transport stream converting unit, configured to convert the multi-program program stream provided by the broadcast television network into a single program program stream of the current program.

a data acquisition unit, receiving the current program delivery stream, acquiring current program audio and video type information, and transmitting identification information of the current program delivery stream audio and video data;

a program mapping information acquiring unit, which acquires program mapping information of the previous section;

a program type information comparison unit for determining whether the current program audio and video type information is the same as the previous program audio and video type information;

The transport stream processing unit, when determining that the current program audio and video type information is the same as the previous program audio and video type information, replacing the transmission identification information of the current program transmission audio and video data with the transmission of the previous program transmission audio and video data The identification information is replaced with the program mapping information of the current program by the program mapping information of the previous section, and the current program delivery stream replaced by the transmission identification information and the program mapping information is transmitted to the media player for playing.
The apparatus according to claim 8, wherein said transmission identification information is a flag code transmission packet PID, and said program mapping information is a program map table PMT.
The program switching device according to claim 9, wherein the data acquisition unit comprises:

a search data acquisition unit, configured to acquire, from the digital television signal, the current program audio and video type information and the current code of the current program delivery stream audio and video data in the search process; or

The parsing data obtaining unit is configured to parse the current program audio and video type information from the current program transport stream and the flag code transport packet PID of the current program transport stream audio and video data.
The program switching apparatus according to claim 9, wherein the program map table PMT acquisition unit comprises:

a PMT extracting unit, configured to directly extract the program map PMT of the previous section in the previous program transport stream; or

The PMT reconstruction unit is configured to reconstruct the program map PMT of the previous section according to the audio and video type information of the previous section and the identifier transmission packet PID of the previous program transmission stream audio and video data.
The program switching apparatus according to claim 9, wherein said transport stream processing unit comprises:

a PMT encapsulating unit, configured to encapsulate the PID code packet of the previous section into at least one transport packet;

The PMT replacement unit is configured to replace the transport packet of the program link table PMT of the previous section with the transport packet of the program map PMT of the current program.
A terminal includes a communication interface, an input device, and an output device, wherein the terminal device further includes a program switching device, wherein the program switching device is connected to the input device and the output device through a communication interface, and the program switching The device includes:

And a transport stream converting unit, configured to convert the multi-program program stream provided by the broadcast television network into a single program program stream of the current program.

a data acquisition unit, receiving the current program delivery stream, acquiring current program audio and video type information, and transmitting identification information of the current program delivery stream audio and video data;

a program mapping information acquiring unit, which acquires program mapping information of the previous section;

a program type information comparison unit for determining whether the current program audio and video type information is the same as the previous program audio and video type information;

The transport stream processing unit, when determining that the current program audio and video type information is the same as the previous program audio and video type information, replacing the transmission identification information of the current program transmission audio and video data with the transmission of the previous program transmission audio and video data The identification information is replaced with the program mapping information of the current program by the program mapping information of the previous section, and the current program delivery stream replaced by the transmission identification information and the program mapping information is transmitted to the media player for playing.
The terminal of claim 13 wherein said terminal is a smart television, a conditional receiver or a network box.