JP2005020429A - Stream receiver, stream transmitter and stream transmission and reception system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stream data receiver capable of receiving an MPEG-2 program stream, etc., halfway and reproducing the program steam, etc., with no waiting time and to provide a transmitter and a transmission and reception system. <P>SOLUTION: This stream data receiver is provided with a data receiving part 11 for receiving stream data, a stream data converting part 12a for rewriting and converting packet time management information of the received stream data and a data recording part 16 for recording the stream data with the time management information rewritten to thereby reproduce the recorded stream data without waiting time regardless of reproduction waiting time set in a packet received at the start of reception even when the stream data are received halfway. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a stream data receiver capable of reproducing without waiting time after accumulating signals such as video and audio, particularly MPEG-2 (Moving Picture Expert Group Phase 2) program stream and MPEG-1 system stream. The present invention relates to a device, a transmission device, and a transmission / reception system.
[0002]
[Prior art]
Conventionally, when video signals and audio signals are encoded and transmitted, the timing for each unit of decoding and reproduction called an access unit is synchronized, or both the video and audio are synchronized. In addition, a time stamp indicating when to decode and reproduce is added. Further, a time base reference value to which a time base is given is given to this time stamp. With this reference time reference value, the decoder can set and calibrate to a value intended on the encoder side.
[0003]
A communication device as shown in FIG. 13 is known as a device that transmits and receives data using such a reference time reference value.
[0004]
In this communication apparatus, an ATM / MPEG conversion unit 211 converts an ATM cell transmitted via the network 200 into an MPEG transport packet and outputs it to the TS packet synchronization unit 212. The TS packet synchronization unit 212 establishes synchronization of the MPEG transport packet from the ATM / MPEG conversion unit 211 and outputs it to the PCR packet detection unit 213. The PCR packet detection unit 213 detects a packet including a PCR (Program Clock Reference, program time base reference value), and outputs the detection result to the PCR rewriting unit 214. The crystal oscillator 215 generates a 27 MHz clock and outputs it to the PCR rewriting unit 214. The PCR rewriting unit 214 counts the clock from the crystal oscillator 215 and rewrites the PCR of the PCR packet to a value calculated based on the PCR and the count value. This makes it possible to absorb delay fluctuations without referring to the network clock (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP 2001-16210 A
[0006]
[Problems to be solved by the invention]
However, in such a conventional communication apparatus, the data format to be transmitted is an MPEG2 transport packet optimized for stream transmission. Therefore, in order to store and reproduce, the transport stream is changed from the program stream to the program stream. Conversion must be done after accumulation. In the case of a communication device that transmits data as an MPEG2 program stream, each packet is set to be played back after the waiting time specified in the packet header. Although continuous playback can be performed, there is a problem that when playback is performed halfway, the playback does not start unless the waiting time set in the corresponding packet is waited.
[0007]
For example, as shown in FIG. 14, even if the reception is started N seconds after the transmission of the stream data and the video received from this point is displayed, the packet at the time of reception is set to be played back after N seconds. Therefore, since the video is reproduced after 2 N seconds, which is N seconds after N seconds, a waiting time of N seconds occurs from the start of reception.
[0008]
The present invention has been made to solve such a problem, and it is possible to perform playback without waiting time for content received by mid-participation and record data from an arbitrary time. A stream data receiving device, a transmitting device, and a transmission / reception system are provided.
[0009]
[Means for Solving the Problems]
The stream receiving apparatus of the present invention includes a data receiving means for receiving stream data to which additional information including time management information for managing a decoding reproduction time of the video signal is encoded and the received video data. A stream data converting means for rewriting the time management information of the stream data to convert the stream data; and a data recording means for recording the stream data with the rewritten time management information. is doing.
[0010]
With this configuration, since the time management information of the stream data is rewritten and recorded, the recorded stream data can be recorded regardless of the reproduction waiting time set in the packet received at the start of reception even if the stream data is received from the middle. It can be played back at a desired time.
[0011]
In the stream receiving device of the present invention, the stream data converting means includes a header adding means for adding a system header indicating summary information of stream data received by the data receiving means, and time management information of the stream data. And a time management information rewriting means for rewriting.
[0012]
With this configuration, the time management information in the stream data is rewritten and a system header is added, so that even if the stream data is received from the middle, the converted stream data can be handled in the same way as conventional stream data. It becomes.
[0013]
Furthermore, the stream receiving device of the present invention is characterized in that the stream data converting means rewrites the time management information of the stream data received by the data receiving means with the reception start time of the stream data as a reference value. have.
[0014]
With this configuration, since the time management information of the stream data is rewritten with the reception start time as the reference time, when the stream data is reproduced, the reproduction can be instantaneously performed without waiting time.
[0015]
Further, in the stream receiving device of the present invention, the stream data received by the receiving unit includes an encoded audio signal related to the video signal and time management information for managing a decoding reproduction time of the audio signal, The video signal and the audio signal are synchronized by the time management information, and the stream data conversion means rewrites the time management information while maintaining the synchronization of the video signal and the audio signal. It has the structure characterized by these.
[0016]
With this configuration, the time management information of stream data in which video and audio are multiplex-encoded is rewritten while maintaining the synchronization of video and audio, so that video and audio can be reproduced in synchronization after stream data conversion. It becomes.
[0017]
Furthermore, the stream receiving apparatus of the present invention separates the stream data, in which the time management information is rewritten by the stream data converting means, into first data related to the video signal and second data related to the audio signal. Multiple data demultiplexing means, video signal decoding means for decoding the first data related to the separated video signal to generate a video signal, and second data relating to the separated audio signal Audio signal decoding means for generating an audio signal, video signal display means for displaying the video signal decoded by the video signal decoding means based on the rewritten time management information, and the audio signal decoding Audio signal reproduction means for reproducing the audio signal decoded by the conversion means based on the rewritten time management information. It has a configuration in which the symptoms.
[0018]
With this configuration, since the video signal and the audio signal are separated, decoded, and reproduced based on the time management information, the video and audio can be reproduced immediately even in the middle of the stream data. .
[0019]
Furthermore, the stream receiving apparatus of the present invention encodes a video signal and an audio signal related to the video signal, and additional information including time management information for managing a decoding reproduction time of the video signal and the audio signal. A data receiving means for receiving the attached stream data; a stream data converting means for rewriting the time management information of the received stream data to convert the stream data; and stream data with the time management information rewritten, Multiplex data separation means for separating the first data related to the video signal and the second data related to the audio signal, and decoding the first data related to the separated video signal to generate a video signal A video signal decoding means, and decoding the second data related to the separated audio signal, Audio signal decoding means for generating, video signal display means for displaying the video signal decoded by the video signal decoding means based on the rewritten time management information, and decoding by the audio signal decoding means Audio signal reproducing means for reproducing the converted audio signal based on the rewritten time management information.
[0020]
With this configuration, even if the converted stream data is not recorded, the video signal and the audio signal are separated, decoded, and reproduced based on the time management information. Thus, video and audio can be reproduced.
[0021]
Furthermore, the stream receiving apparatus of the present invention has a configuration characterized in that the stream data is a bit stream compliant with the MPEG system.
[0022]
With this configuration, an MPEG bit stream is received, so that international standard data for video signal and audio signal encoding can be received, and standard data can be received with high compatibility.
[0023]
Furthermore, the stream transmission device of the present invention includes a data generation unit that encodes a video signal and generates stream data to which additional information including time management information for managing the decoding and reproduction time of the video signal is added, Stream data conversion means for converting the stream data by rewriting time management information of stream data, data recording means for recording the converted stream data, stream data generated by the data generation means or recorded And a data transmission means for transmitting the stream data to the outside.
[0024]
With this configuration, stream data is generated, transmitted, and time management information is rewritten and recorded. Therefore, the recorded stream data can be recorded at a desired time regardless of the reproduction waiting time set from the generation start time of the stream data. It can be reproduced and the recorded data can be transmitted.
[0025]
Further, in the stream transmitting apparatus of the present invention, the stream data converting means includes a header adding means for adding a system header representing summary information of the stream data generated by the data generating means, and time management information of the stream data. And a time management information rewriting means for rewriting.
[0026]
With this configuration, a predetermined time is acquired, and the time management information is rewritten based on this time. Therefore, it is possible to record from any position while transmitting stream data, and to reproduce the recorded stream data without waiting time. Will be able to.
[0027]
Furthermore, the stream transmission apparatus of the present invention further includes a reference time acquisition unit that acquires a reference time of time management information rewritten by the stream data conversion unit, and the stream data conversion unit includes the stream data generated by the data generation unit. The time management information is rewritten based on the reference time.
[0028]
With this configuration, since a predetermined time is acquired and the time management information is rewritten based on this time, it is possible to record stream data from an arbitrary position and transmit stream data that can be reproduced without waiting time. It will be possible.
[0029]
Further, in the stream transmission device of the present invention, the data generation means encodes an audio signal associated with the video signal and adds additional information including time management information for managing a decoding reproduction time of the audio signal. The stream data multiplexed with the video signal is generated, and the stream data conversion means rewrites the time management information while maintaining synchronization between the video signal and the audio signal. Have.
[0030]
With this configuration, since video and audio are multiplexed and time management information is rewritten while maintaining video and audio synchronization, stream data in which video and audio are synchronized can be transmitted even after stream data conversion. Become.
[0031]
Furthermore, the stream transmitting apparatus of the present invention has a configuration characterized in that the stream data is a bit stream compliant with the MPEG system.
[0032]
With this configuration, since the MPEG bit stream is transmitted, international standard data for video signal and audio signal encoding can be transmitted, and standard data can be transmitted with high compatibility.
[0033]
Furthermore, the stream transmission / reception system of the present invention encodes a video signal, and generates data for generating stream data to which additional information including time management information for managing the decoding / playback time of the video signal is provided. Data transmitting means for transmitting the stream data to the outside, data receiving means for receiving the transmitted stream data from the middle, and rewriting time management information of the received stream data to convert the stream data It has a configuration characterized by comprising stream data conversion means and data recording means for recording stream data in which the time management information is rewritten.
[0034]
With this configuration, stream data obtained by encoding a video signal is transmitted, the stream data is received from the middle, and the time management information is rewritten and recorded, so that the waiting time during playback can be changed, and the stream data Even from the middle of the stream, it is possible to record stream data that starts to be reproduced immediately after decoding.
[0035]
Furthermore, the stream transmission / reception system of the present invention is characterized in that the stream data conversion means rewrites the time management information of the stream data received by the data reception means with the reception start time of the stream data as a reference value. have.
[0036]
With this configuration, since the time management information is rewritten with the reception start time of the stream data as a reference value, it can be recorded as stream data that is immediately reproduced from the data that has started reception.
[0037]
Further, in the stream transmission / reception system according to the present invention, the data generation means encodes an audio signal associated with the video signal and adds additional information including time management information for managing a decoding reproduction time of the audio signal. The stream data multiplexed with the video signal is generated, and the stream data conversion means rewrites the time management information while maintaining synchronization between the video signal and the audio signal. Have.
[0038]
With this configuration, the time management information is rewritten while maintaining the synchronization between the video and the audio, so that the data in which the video and the audio are synchronized can be recorded even after the stream data conversion.
[0039]
Furthermore, the stream transmission / reception system according to the present invention provides stream data in which the time management information is rewritten in the stream data conversion means, first data associated with the video signal, and second data associated with the audio signal. Multiplexed data separating means for separating the first data, video signal decoding means for decoding the first data related to the separated video signal to generate a video signal, and second data related to the separated audio signal Audio signal decoding means for decoding data to generate an audio signal; video signal display means for displaying the video signal decoded by the video signal decoding means based on the rewritten time management information; Audio signal reproduction means for reproducing the audio signal decoded by the audio signal decoding means based on the rewritten time management information. It has a configuration in which characterized in that.
[0040]
With this configuration, since the video signal and the audio signal are separated, decoded, and reproduced based on the time management information, the video and audio can be reproduced immediately even in the middle of the stream data. Become.
[0041]
Furthermore, the stream transmission / reception system of the present invention includes a data generation unit that encodes a video signal and generates stream data to which additional information including time management information for managing the decoding / playback time of the video signal is added, Reference time acquisition means for acquiring reference time information for reproducing the generated stream data from the middle, a system header representing summary information of the stream data, and a time management information of the stream data are added to the reference Stream data converting means for rewriting based on time and converting the stream data, data recording means for recording the converted stream data, data transmitting means for transmitting the recorded stream data to the outside, and the transmission Receiving means for receiving the streamed data A decoding means for decoding the received stream data; and a reproduction means for reproducing the signal decoded by the decoding means based on the rewritten time management information. It has a configuration.
[0042]
This configuration records and transmits stream data from the middle when the time management information has been rewritten on the transmission side, so that it is possible to send and receive data extracted from only the necessary portion of the stream data, and to reduce the waiting time during playback. It can be lost.
[0043]
Furthermore, the stream transmission / reception system of the present invention has a configuration characterized by including the stream reception device and the stream transmission device.
[0044]
With this configuration, stream data can be arbitrarily recorded by the stream transmission device and the stream reception device, the recorded stream data can be transmitted from the stream transmission device, and the recorded stream data can be arbitrarily It can be played back.
[0045]
Further, the stream reception program of the present invention includes a data reception step of receiving stream data to which additional information including time management information for managing a decoding reproduction time of the video signal is encoded and a video signal is encoded, A stream data conversion step for rewriting the time management information of the stream data to convert the stream data, and a data recording step for recording the stream data with the rewritten time management information have.
[0046]
With this configuration, since the time management information of the stream data is rewritten and recorded, the recorded stream data can be recorded regardless of the reproduction waiting time set in the packet received at the start of reception even if the stream data is received from the middle. It can be played back at a desired time.
[0047]
Furthermore, the stream transmission program of the present invention includes a data generation step of encoding stream signals and generating stream data to which additional information including time management information for managing the decoding / playback time of the video signals is added, Stream data conversion step for converting the stream data by rewriting time management information of the stream data, a data recording step for recording the converted stream data, and the stream data generated in the data generation step or recorded A data transmission step of transmitting the stream data to the outside.
[0048]
With this configuration, the time management information of the stream data is rewritten, recorded, and transmitted, so that it is possible to transmit stream data in which the waiting time during reproduction is adjusted.
[0049]
Furthermore, the stream transmission / reception program of the present invention encodes a video signal and generates a stream data to which additional information including time management information for managing the decoding / playback time of the video signal is generated, and a generation A data transmission step of transmitting the stream data to the outside, a data reception step of receiving the transmitted stream data from the middle, and rewriting time management information of the received stream data to convert the stream data A stream data converting step; and a data recording step for recording the stream data in which the time management information is rewritten.
[0050]
With this configuration, stream data obtained by encoding a video signal is transmitted, the stream data is received from the middle, and the time management information is rewritten and recorded, so that the waiting time during playback can be changed, and the stream data Even from the middle of the stream, it is possible to record stream data that starts to be reproduced immediately after decoding.
[0051]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
[0052]
As shown in FIG. 1, a stream reception device 10a according to the first embodiment of the present invention receives a data reception unit 11 that receives stream data in which video data (video signal) and audio data (audio signal) are multiplexed. A stream data converter 12a for rewriting and converting the time management information of the stream data, a data recording unit 16 for recording the converted stream data, and separating the converted stream data into video data and audio data A storage-type audio video multiplexed data separating unit 17; a video data decoding unit 18 for decoding the separated video data; an audio data decoding unit 19 for decoding the separated audio data; and the decoding Video display unit 20 for displaying the converted video data, and the decoding And a audio reproducing unit 21 for reproducing the audio data.
[0053]
Here, the stream data handled in the present embodiment is a PS (program stream) of MPEG-2 (Moving Picture Expert Group Phase 2).
[0054]
2 and 3 show the format structure of stream data encoded by the MPEG method, and will be described.
[0055]
MPEG stream data is multiplexed by packets, and when video data and audio data are multiplexed as shown in FIGS. 2 and 3, each of video data and audio data is divided into packets of appropriate lengths, Additional information such as a header is attached, and video and audio packets are switched appropriately and time-division transmitted. The nature of data such as video or audio can be determined by adding an identification code to the packet header.
[0056]
Also, normally, a plurality of packets are handled as a unit of a pack, and MPEG stream data is constituted by a plurality of packs. A pack header is assigned to each pack, and a system header describing the outline of the entire stream is attached to the first pack.
[0057]
Further, in the pack header, an SCR (System Clock Reference, system time reference reference value) value of STC (System Time Clock, reference synchronization information) that is a time reference in the MPEG system decoder is intended on the encoder side. There exists time management information for setting and calibrating to the set value.
[0058]
In the packet header, there are reproduction output time management information called PTS (Presentation Time Stamp) and decoding time management information called DTS (Decoding Time Stamp). If this PTS and DTS match, only PTS is attached.
[0059]
Hereinafter, each unit of the stream receiving device 10a will be described in detail.
[0060]
The data receiving unit 11 receives the above stream data to which video data and audio data are multiplexed and time management information is added. Further, the stream data received by the data receiving unit 11 may be stream data in which only one of video data or audio data is encoded.
[0061]
The stream data conversion unit 12a converts the stream data by rewriting time management information in the pack header or packet of the stream data received by the data reception unit 11. Specifically, the SCR in the pack header or the PTS and DTS in the packet header are rewritten.
[0062]
Further, the stream data conversion unit 12a includes a header addition unit 13 for adding a system header indicating summary information of the stream data received by the data reception unit 11, and time management information (time stamp in the pack header or packet of the stream data). The recording time stamp rewriting unit 14 and the reproduction time stamp rewriting unit 15 are provided.
[0063]
Here, the recording time stamp rewriting unit 14 rewrites time management information of stream data for data recording, and the reproduction time stamp rewriting unit 15 rewrites time management information of stream data for data display. It is.
[0064]
The recording time stamp rewriting unit 14 and the reproduction time stamp rewriting unit 15 rewrite the time management information while keeping the video data and audio data in the stream data synchronized.
[0065]
Further, the recording time stamp rewriting unit 14 rewrites the time management information in the pack header or packet of the stream data, with the data recording start time of the stream data as a reference (0 seconds), and all subsequent time management information. Is. Further, the reproduction time stamp rewriting unit 15 rewrites the time management information in the pack header or packet of the stream data, with the data reproduction start time of the stream data as a reference (0 seconds), and all subsequent time management information. Is.
[0066]
Specifically, if the time management information in the pack header or packet header of the stream data at the time of recording start or playback start is “playback after N seconds”, it is rewritten as “playback after 0 seconds” The subsequent time management information is a value obtained by subtracting N seconds. For example, if the time management information of the stream data after the start of recording is “reproduce after T seconds”, it is rewritten as “reproduce after (T−N) seconds”.
[0067]
As a result, as shown in FIG. 4, playback can be started immediately even during halfway participation. Similarly, recording can be performed from a free point.
[0068]
The stream data conversion unit 12a has two time stamp rewriting units, ie, a header adding unit 13, a recording time stamp rewriting unit 14 and a reproduction time stamp rewriting unit 15, but the stream shown in FIG. Like the stream data conversion unit 12b of the receiving device 10b, the header addition unit 31 and the time stamp rewriting unit 32 may be configured.
[0069]
Returning to the detailed description of each part of the stream receiving device 10a, the data recording unit 16 records the stream data in which the time management information is rewritten in the recording time stamp rewriting unit 14.
[0070]
The storage-type audio video multiplexed data separation unit 17 separates the stream data in which the time management information is rewritten in the reproduction time stamp rewriting unit 15 into video data and audio data.
[0071]
The video data decoding unit 18 decodes the video data separated by the storage type audio video multiplexed data separation unit 17. The audio data decoding unit 19 decodes the audio data separated by the storage type audio video multiplexed data separation unit 17.
[0072]
The video display unit 20 displays the video data decoded by the video data decoding unit 18 based on the time management information rewritten by the reproduction time stamp rewriting unit 15. The audio reproduction unit 21 reproduces the audio data decoded by the audio data decoding unit 19 based on the time management information rewritten by the reproduction time stamp rewriting unit 15.
[0073]
Next, the operation of the stream receiving apparatus 10a according to the present embodiment will be described with reference to the flowchart shown in FIG.
[0074]
First, in the stream receiving device 10a, the data receiving unit 11 receives stream data (MPEG2-PS) (step S11). When receiving the stream data, the data receiving unit 11 outputs the received stream data to the recording time stamp rewriting unit 14 and the reproduction time stamp rewriting unit 15 of the stream data conversion unit 12a. Further, the header adding unit 13 generates a system header of the stream data received by the data receiving unit 11, and outputs the system header to the recording time stamp rewriting unit 14 and the reproduction time stamp rewriting unit 15 (step S12).
[0075]
Next, the recording time stamp rewriting unit 14 rewrites the time management information in the pack header or packet header of the stream data input from the data receiving unit 11 with the recording start time as a reference. Further, the system header input from the header adding unit 13 is added, the stream data is converted, and output to the data recording unit 16 (step S13).
[0076]
The reproduction time stamp rewriting unit 15 rewrites the time management information in the pack header or packet header of the stream data input from the data receiving unit 11 with the reproduction start time as a reference. Further, the system header input from the header adding unit 13 is added, the stream data is converted, and output to the storage type audio video multiplexed data separating unit 17 (step S14).
[0077]
Here, the data structure diagram of the stream data is shown in FIG. 7, and the stream data conversion processing of the stream data conversion unit 12a will be described.
[0078]
In the first pack of stream data, there is a system header following the pack header, but there is no data in the necessary halfway data. Therefore, only necessary packets are taken, a pack with a system header is generated, and rewritten as new stream data. At this time, the time management information is also rewritten. As a result, the generated stream data can be normally handled as normal MPEG data.
[0079]
Returning to the description of the operation processing of the stream receiving device 10a, when the stream data conversion unit 12a completes rewriting of the stream data, the data recording unit 16 records the stream data input from the recording time stamp rewriting unit 14 (step). S15).
[0080]
The storage-type audio video multiplexed data separating unit 17 separates the stream data input from the reproduction time stamp rewriting unit 15 into video data and audio data, and outputs the separated video data to the video data decoding unit 18. The separated audio data is output to the audio data decoding unit 19 (step S16).
[0081]
Next, the video data decoding unit 18 decodes the video data input from the storage type audio video multiplexed data separation unit 17 and outputs it to the video display unit 20 (step S17). Also, the audio data decoding unit 19 decodes the audio data input from the storage type audio video multiplexed data separation unit 17 and outputs the audio data to the audio reproduction unit 21 (step S18).
[0082]
Next, the video display unit 20 displays the video data input from the video data decoding unit 18 based on the time management information rewritten by the reproduction time stamp rewriting unit 15. The audio playback unit 21 plays back the audio data input from the audio data decoding unit 19 based on the time management information rewritten by the playback time stamp rewriting unit 15 (step S19).
[0083]
Through the above processing, according to the first embodiment of the present invention, the decoded video data and audio data are synchronized by the rewritten time management information, and the video and audio are displayed and reproduced in accordance with each other. can do. Also, since the time management information is rewritten, even if stream data is received from the middle, it can be reproduced without waiting for the reproduction waiting time set in the packet received at the start of reception. Further, by rewriting the time management information at the time of recording, when this stream data is reproduced, it can be instantaneously reproduced without waiting time.
(Second Embodiment)
[0084]
Next, a stream transmitting apparatus according to the second embodiment of the present invention will be described.
[0085]
As shown in FIG. 8, the stream transmission device 40 according to the second embodiment of the present invention encodes and multiplexes a video signal input unit 41, an audio signal input unit 42, video data and audio data, and streams A storage-type audio / video multiplexed data generation unit 43 that generates data, a data transmission unit 47 that transmits stream data to the outside, a stream data conversion unit 48 that rewrites time management information of stream data, and a data recording that records stream data Part 51.
[0086]
The storage-type audio video multiplex data generation unit 43 gives additional information including time management information for managing the decoding / playback time of the video data, and also includes a video data encoding unit 44 for encoding the video data, and audio data. Audio data encoding unit 45 that encodes audio data, and storage-type audio video data multiplexing unit that multiplexes the video data and the audio data 46.
[0087]
The video data encoding unit 44 inputs video data (video signal) from the video signal input unit 41, encodes it, and outputs it. The audio data encoding unit 45 inputs audio data (audio signal) related to the video data from the audio signal input unit 42, encodes it, and outputs it. The storage-type audio video data multiplexing unit 46 receives the encoded video data from the video data encoding unit 44, receives the encoded audio data from the audio data encoding unit 45, and sets each identification code. The header information is added, multiplexed, and output.
[0088]
The data transmission unit 47 receives the stream data from the storage type audio video data multiplexing unit 46 and transmits it to the network.
[0089]
The stream data conversion unit 48 includes a header addition unit 49 that generates and adds a system header of stream data, and a time stamp rewriting unit 50 that rewrites time management information (time stamp) in the stream data.
[0090]
The header adding unit 49 generates a system header of the stream data multiplexed in the storage type audio video data multiplexing unit 46 and passes it to the time stamp rewriting unit 50.
[0091]
The time stamp rewriting unit 50 inputs the stream data from the storage type audio video data multiplexing unit 46 and rewrites the time management information of the stream data according to the recording timing. Further, the rewriting time may be given a predetermined time from the outside. The time management information is rewritten while maintaining the synchronization of the video data and the audio data.
[0092]
As a specific rewriting method of the time management information, as in the time management information rewriting method in the stream receiving device 10a in the first embodiment, the pack header or the packet header of the stream data at the time of recording start is used. If the time management information is “reproduce after N seconds”, it is rewritten as “reproduce after 0 seconds”, and the subsequent time management information is a value obtained by subtracting N seconds. For example, if the time management information of the stream data after the start of recording is “reproduce after T seconds”, it is rewritten as “reproduce after (T−N) seconds”.
[0093]
The data recording unit 51 records the stream data in which the time management information is rewritten in the time stamp rewriting unit 50 as described above.
[0094]
Next, the operation of the stream transmitting apparatus 40 according to the present embodiment will be described with reference to a flowchart shown in FIG.
[0095]
First, in the stream transmission device 40, a video signal (video data) and an audio signal (audio data) are input by the video signal input unit 41 and the audio signal input unit 42 (step S31). In the video signal input unit 41 and the audio signal input unit 42, when video data and audio data are input, the input video data is input to the video data encoding unit 44 of the storage type audio video multiplexed data generation unit 43, and the audio data is stored. The data is output to the audio data encoding unit 45 of the audio video multiplexed data generation unit 43 (step S32).
[0096]
Next, the video data encoding unit 44 inputs the video data from the video signal input unit 41, adds additional information including time management information for managing the decoding / playback time of the video data, and encodes the video data. Is output to the storage-type audio video data multiplexing unit 46 (step S33).
[0097]
The audio data encoding unit 45 inputs audio data related to the video data from the audio signal input unit 42, gives additional information including time management information for managing the decoding / playback time of the audio data, and adds audio data Is encoded and output to the storage type audio video data multiplexing unit 46 (step S34).
[0098]
Next, the storage type audio video data multiplexing unit 46 receives the video data encoded from the video data encoding unit 44 and the audio data encoded from the audio data encoding unit 45, and identifies each of them. The header information including the code is added and multiplexed and output (step S35).
[0099]
Next, the data transmission unit 47 receives the stream data obtained by multiplexing the video data and the audio data from the storage type audio video data multiplexing unit 46, and transmits the stream data on the network (step S36).
[0100]
Further, the header adding unit 49 generates a system header of the stream data multiplexed in the storage type audio video data multiplexing unit 46, and outputs the system header to the time stamp rewriting unit 50 (step S37).
[0101]
The time stamp rewriting unit 50 receives the stream data from the storage type audio video data multiplexing unit 46, adds the system header input from the header adding unit 49, and rewrites the time management information of the stream data according to the recording timing. (Step S38).
[0102]
In the data recording unit 51, the stream data whose time management information has been rewritten by the time stamp rewriting unit 50 is input and recorded (step S39). The stream data recorded in the data recording unit 51 can be transmitted as necessary.
[0103]
Through the above processing, according to the second embodiment of the present invention, the data from the middle of the stream data can be recorded as the same data as the normal stream data at a predetermined recording timing, and at the time of reproduction. Stream data that can be reproduced instantaneously without waiting time can be recorded.
(Third embodiment)
[0104]
Next, a stream transmission / reception system according to the third embodiment of the present invention will be described.
[0105]
As shown in FIG. 10, a stream transmission / reception system 101 according to the third embodiment of the present invention includes a stream transmission device 60 that generates and transmits stream data, and a stream reception device that receives, records, and reproduces stream data. The stream transmission device 60 and the stream reception device 10a are connected via the network 100.
[0106]
In addition, the stream transmission device 60 includes a video signal input unit 61, an audio signal input unit 62, a storage type audio video multiplexed data generation unit 63 that encodes and multiplexes video data and audio data, and generates stream data. And a data transmission unit 67 for transmitting the stream data to the outside.
[0107]
Further, the storage-type audio video multiplexed data generating unit 63 gives additional information including time management information for managing the decoding / playback time of the video data, and also includes a video data encoding unit 64 for encoding the video data, and audio data. Audio data encoding unit 65 that encodes audio data, and storage-type audio video data multiplexing unit that multiplexes the video data and the audio data 66.
[0108]
Therefore, the stream transmission device 60 is obtained by removing the stream data conversion unit 48 and the data recording unit 51 from the stream transmission device 40 in the second embodiment, or the same as the conventional stream transmission device. is there.
[0109]
The stream receiving device 10a is the same as the stream receiving device 10a in the first embodiment. Since the stream receiving device 10a has the same configuration, the same reference numerals are given and description thereof is omitted.
[0110]
In such a stream transmission / reception system 101, conventional stream data is generated by the stream transmission device 60 and transmitted to the network 100. In the stream receiving device 10a, the stream data transmitted from the stream transmitting device 60 is received from the middle, and the stream data in which the time management information is rewritten is recorded and reproduced as in the above embodiment.
[0111]
As described above, according to the third embodiment of the present invention, stream data is generated and transmitted, and when the stream data is received from the middle on the receiving side, time management information is rewritten, and recording and playback are performed. Therefore, the stream data from the middle can be reproduced instantaneously without waiting time, and the recorded stream data can be called and reproduced instantaneously.
(Fourth embodiment)
[0112]
Next, a stream transmission / reception system according to the fourth embodiment of the present invention will be described.
[0113]
As shown in FIG. 11, a stream transmission / reception system 102 according to the fourth embodiment of the present invention includes a stream transmission device 40 that generates, records, and transmits stream data, and a stream reception device that receives and reproduces stream data. 80. The stream transmission device 40 and the stream reception device 80 are connected via the network 100.
[0114]
The stream transmission device 40 is the same as the stream transmission device 40 described in the second embodiment, and transmits the stream data recorded in the data recording unit 51 from the data transmission unit 47.
[0115]
The stream receiving device 80 includes a data receiving unit 81 that receives stream data, a data recording unit 86 that records the received stream data, and a storage type audio that separates the received stream data into video data and audio data. A video multiplexed data separator 87; a video data decoder 88 for decoding the separated video data; an audio data decoder 89 for decoding the separated audio data; and the decoded video A video display unit 90 for displaying data and an audio playback unit 91 for playing back the decoded audio data are provided.
[0116]
Therefore, the stream receiving device 80 is the same as the above-described stream receiving device except that the stream data converting unit 12a is removed from the stream receiving device 10a.
[0117]
In such a stream transmission / reception system 102, the stream transmission device 40 records stream data from the middle of rewriting the conventional stream data generation and time management information and transmits the stream data to the network 100, as in the above embodiment. The The stream receiving device 80 receives the stream data in which the time management information transmitted from the stream transmitting device 40 is rewritten, and records and reproduces the stream data.
[0118]
As described above, according to the fourth embodiment of the present invention, stream data from a predetermined time is recorded on the transmission device side by rewriting time management information. Since the stream data with the rewritten time management information has the same format structure as normal stream data, it can be handled in the same way as conventional stream data, and the receiving side receives stream data from the middle as usual. Thus, it is possible to record and reproduce data that does not cause a waiting time during reproduction.
(Fifth embodiment)
[0119]
Next, a stream transmission / reception system according to the fifth embodiment of the present invention will be described.
[0120]
In this embodiment, both the transmission device and the reception device are provided with the characteristic part of the present invention, and the system configuration is specialized for MPEG.
[0121]
As shown in FIG. 12, a stream transmission / reception system 103 according to the fifth embodiment of the present invention generates an MPEG bitstream transmission apparatus 110 that generates, records, and transmits MPEG-compliant stream data, and an MPEG-compliant stream. An MPEG bit stream receiving apparatus 130 for receiving, recording and reproducing data is provided, and the MPEG bit stream transmitting apparatus 110 and the MPEG bit stream receiving apparatus 130 are connected via a network 100.
[0122]
In addition, the MPEG bitstream transmission apparatus 110 encodes and multiplexes the video signal input unit 111, the audio signal input unit 112, the audio data and the audio data to generate an MPEG-1 system stream or an MPEG-2 program stream (hereinafter, referred to as "the MPEG bit stream"). An MPEG1 system / MPEG2 program stream generation unit 113 for generating an MPEG bitstream), a data transmission unit 117 for transmitting the MPEG bitstream to the outside, an MPEG bitstream conversion unit 118 for rewriting time management information of the MPEG bitstream, And a data recording unit 121 for recording the MPEG bit stream.
[0123]
The MPEG1 system / MPEG2 program stream generation unit 113 gives additional information including time management information for managing the decoding / playback time of the MPEG video data, and encodes (encodes) the MPEG video data. Additional information including time management information for managing the decoding / playback time of MPEG audio data, MPEG audio encoding section 115 for encoding (encoding) MPEG audio data, and multiplexing of MPEG video data and MPEG audio data MPEG video / audio data systemization unit 116 is provided.
[0124]
The MPEG video encoding unit 114 inputs video data (video signal) from the video signal input unit 111, encodes it into MPEG data, and outputs it. The MPEG audio encoding unit 115 inputs audio data (audio signal) related to the video data from the audio signal input unit 112, encodes it into MPEG data, and outputs it. The MPEG video / audio data systemization unit 116 inputs the MPEG video data encoded from the MPEG video encoding unit 114, inputs the MPEG audio data encoded from the MPEG audio encoding unit 115, and sets each identification code. The header information is added, multiplexed as an MPEG bit stream, and output.
[0125]
The data transmission unit 117 receives the MPEG bit stream from the MPEG video / audio data systemization unit 116 and the data recording unit 121 and transmits it to the network 100.
[0126]
The MPEG bit stream conversion unit 118 includes a system header adding unit 119 that generates and adds a system header of the MPEG bit stream, and an MPEG time stamp rewriting unit 120 that rewrites time management information (time stamp) in the MPEG bit stream. Yes.
[0127]
The system header adding unit 119 generates a system header of the MPEG bit stream multiplexed in the MPEG video / audio data system forming unit 116 and passes it to the MPEG time stamp rewriting unit 120.
[0128]
The MPEG time stamp rewriting unit 120 receives the MPEG bit stream from the MPEG video / audio data systemizing unit 116 and rewrites the time management information of the MPEG bit stream according to the recording timing. Further, the rewriting time may be given from the outside as in the case of the above-described stream transmitting device 40. The time management information is rewritten while maintaining the synchronization between the MPEG video data and the MPEG audio data.
[0129]
The data recording unit 121 records the MPEG bit stream with the time management information rewritten in the MPEG time stamp rewriting unit 120 as described above.
[0130]
In addition, the MPEG bit stream receiving device 130 includes a data receiving unit 131 that receives an MPEG bit stream in which MPEG video data (video signal) and MPEG audio data (audio signal) are multiplexed, and time management information of the MPEG bit stream. An MPEG bit stream conversion unit 132 that rewrites and converts, a data recording unit 136 that records the converted MPEG bit stream, and an MPEG splitter unit 137 that separates the converted MPEG bit stream into MPEG video data and MPEG audio data. An MPEG video decoding unit 138 for decoding (decoding) the separated MPEG video data, and an MPEG audio decoding unit for decoding (decoding) the separated MPEG audio data. And de unit 139, and a video display unit 140 for displaying the MPEG video data said decoding, the audio reproduction unit 141 for reproducing MPEG audio data said decoding.
[0131]
The data reception unit 131 receives the MPEG bit stream transmitted from the MPEG bit stream transmission device 110.
[0132]
The MPEG bit stream conversion unit 132 converts the MPEG bit stream by rewriting time management information in the pack header or packet of the MPEG bit stream received by the data reception unit 131. Specifically, the SCR in the pack header or the PTS and DTS in the packet header of the packet are rewritten.
[0133]
Also, the MPEG bit stream conversion unit 132 includes a system header addition unit 133 that adds a system header indicating outline information of the MPEG bit stream received by the data reception unit 131, and time management in the pack header or packet of the MPEG bit stream. A recording MPEG time stamp rewriting unit 134 for rewriting information (time stamp) and a reproduction MPEG time stamp rewriting unit 135 are provided.
[0134]
Here, the recording MPEG time stamp rewriting unit 134 rewrites the time management information of the MPEG bit stream for data recording, and the reproduction MPEG time stamp rewriting unit 135 manages the time of the MPEG bit stream for data display. Information is rewritten.
[0135]
The recording MPEG time stamp rewriting unit 134 and the reproduction MPEG time stamp rewriting unit 135 rewrite the time management information while keeping the video data and audio data in the MPEG bitstream synchronized.
[0136]
The data recording unit 136 records the MPEG bit stream with the time management information rewritten in the recording MPEG time stamp rewriting unit 134.
[0137]
The MPEG splitter unit 137 separates the MPEG bit stream in which the time management information is rewritten in the reproduction MPEG time stamp rewriting unit 135 into MPEG video data and MPEG audio data.
[0138]
The MPEG video decoding unit 138 decodes the MPEG video data separated by the MPEG splitter unit 137.
[0139]
The MPEG audio decoding unit 139 decodes the MPEG audio data separated by the MPEG splitter unit 137.
[0140]
The video display unit 140 displays the MPEG video data decoded by the MPEG video decoding unit 138 based on the time management information rewritten by the reproduction MPEG time stamp rewriting unit 135.
[0141]
The audio reproduction unit 141 reproduces the MPEG audio data decoded by the MPEG audio decoding unit 139 based on the time management information rewritten by the reproduction MPEG time stamp rewriting unit 135.
[0142]
In such a stream transmission / reception system 103, in the MPEG bit stream transmission device 110, video and audio data are encoded and multiplexed by the MPEG1 system / MPEG program stream generation unit 113 to generate an MPEG bit stream, and the data transmission unit 117 is transmitted on the network 100.
[0143]
Also, the MPEG bit stream generated by the MPEG1 system / MPEG program stream generation unit 113 is extracted at a predetermined recording timing, and the time management information is rewritten by the MPEG bit stream conversion unit 118 and recorded in the data recording unit 121. . Further, the MPEG bit stream recorded in the data recording unit 121 is transmitted from the data transmission unit 117 to the network 100.
[0144]
The MPEG bit stream receiving apparatus 130 receives a normal MPEG bit stream transmitted from the MPEG bit stream transmitting apparatus 110 or an MPEG bit stream in which time management information is rewritten. Here, since the MPEG bit stream in which the time management information is rewritten has the same format structure as the MPEG bit stream, it can be received in the same manner as a normal MPEG bit stream.
[0145]
The MPEG bit stream conversion unit 132 rewrites the time management information of the received MPEG bit stream and converts the MPEG bit stream.
[0146]
The data recording unit 136 records the MPEG bit stream converted by the MPEG bit stream conversion unit 132 or the received MPEG bit stream as it is.
[0147]
The MPEG splitter unit 137 separates the MPEG bit stream converted by the MPEG bit stream conversion unit 132 or the received MPEG bit stream into MPEG video data and MPEG audio data.
[0148]
The separated MPEG video data is decoded by the MPEG video decoding unit 138 and displayed on the video display unit 140 based on the time management information.
[0149]
The MPEG audio data separated by the MPEG splitter unit 137 is decoded by the MPEG audio decoding unit 139 and reproduced by the audio reproducing unit 141 based on the time management information.
[0150]
As described above, according to the fifth embodiment of the present invention, since both the transmission device and the reception device include the time management information rewriting unit, the time management information is suitable for the convenience of each terminal. Can be rewritten.
[0151]
Further, in the above-described embodiment, it has been described that there is one stream transmission device and one stream reception device, but there may be a plurality of stream transmission devices and stream reception devices, one of which is one. Thus, it can be realized even when the other is plural.
[0152]
【The invention's effect】
As described above, the present invention relates to the reproduction waiting time set in the packet received at the start of reception even if the stream data is received from the middle by rewriting and recording the time management information of the stream data. Therefore, it is possible to provide a stream receiving apparatus having an excellent effect that recorded stream data can be reproduced at a desired time.
[0153]
In addition, the present invention provides a stream transmission apparatus having an excellent effect that it is possible to transmit stream data in which the waiting time during reproduction can be transmitted because the time management information of the stream data is rewritten, recorded, and transmitted. can do.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a stream receiving apparatus according to a first embodiment of the present invention.
FIG. 2 is a data structure diagram showing the format structure of MPEG data.
FIG. 3 is a diagram for explaining the format structure of MPEG data;
FIG. 4 is a schematic diagram for explaining time stamp change processing;
FIG. 5 is a block diagram showing a stream receiving apparatus having a time stamp rewriting unit as one configuration;
FIG. 6 is a flowchart showing the operation of the stream reception apparatus according to the first embodiment of the present invention.
FIG. 7 is a data structure diagram of stream data for explaining stream data conversion processing according to the present invention.
FIG. 8 is a block diagram showing a stream transmission apparatus according to the second embodiment of the present invention.
FIG. 9 is a flowchart showing the operation of the stream transmitting apparatus according to the second embodiment of the present invention.
FIG. 10 is a block diagram showing a stream transmission / reception system according to a third embodiment of the present invention.
FIG. 11 is a block diagram showing a stream transmission / reception system according to a fourth embodiment of the present invention.
FIG. 12 is a block diagram showing a stream transmission / reception system according to a fifth embodiment of the present invention.
FIG. 13 is a block diagram showing a conventional receiving apparatus.
FIG. 14 is a schematic diagram for explaining conventional reproduction timing.
[Explanation of symbols]
10a, 10b stream receiver
11 Data receiver
12a, 12b Stream data converter
13 Header addition part
14 Time stamp rewriting part for recording
15 Playback time stamp rewriting part
16 Data recording part
17 Storage type audio video multiplex data separation unit
18 Video data decoding unit
19 Audio data decoding unit
20 Video display
21 Audio playback unit
31 Header addition part
32 Timestamp rewriting part
40 Stream transmitter
41 Video signal input section
42 Audio signal input section
43 Storage Type Audio Video Multiplex Data Generation Unit
44 Video data encoder
45 Audio data encoder
46 Storage type audio video data multiplexing unit
47 Data transmitter
48 Stream data converter
49 Header addition part
50 Timestamp rewriting part
51 Data recording part
60 Stream transmitter
61 Video signal input section
62 Audio signal input section
63 Storage type audio video multiplexed data generator
64 Video data encoding unit
65 Audio data encoding unit
66 Storage Type Audio Video Data Multiplexer
67 Data transmitter
80 Stream receiver
81 Data receiver
86 Data recording part
87 Storage type audio video multiplex data separation unit
88 Video data decoder
89 Audio data decoder
90 Video display
91 Audio playback section
100 network
101 Stream transmission / reception system
102 Stream transmission / reception system
103 Stream transmission / reception system
110 MPEG Bitstream Transmitter
111 Video signal input section
112 Audio signal input section
113 MPEG1 system / MPEG2 program stream generator
114 MPEG video encoding unit
115 MPEG audio encoding unit
116 MPEG video / audio data systemization part
117 Data transmission unit
118 MPEG bit stream converter (MPEG-BS converter)
119 System header addition part
120 MPEG time stamp rewriting section
121 Data recording part
130 MPEG bitstream receiver
131 Data receiver
132 MPEG bit stream converter (MPEG-BS converter)
133 System header addition part
134 MPEG Timestamp Rewriting Unit for Recording
135 Playback MPEG Timestamp Rewriting Unit
136 Data recording part
137 MPEG splitter section
138 MPEG video decoding unit
139 MPEG audio decoding unit
140 Video display
141 Audio playback unit
200 network
210 Receiver
211 ATM / MPEG conversion unit
212 TS packet synchronization unit
213 PCR packet detector
214 PCR rewriting unit
215 crystal oscillator
216 memory

Claims (21)

Data receiving means for receiving stream data to which additional information including time management information for managing a video signal is encoded and time management information for decoding and reproducing the video signal;
Stream data conversion means for rewriting the time management information of the received stream data and converting the stream data;
A stream receiving apparatus comprising: data recording means for recording stream data in which the time management information is rewritten. The stream data conversion means includes a header addition means for adding a system header representing summary information of stream data received by the data reception means, and a time management information rewriting means for rewriting time management information of the stream data. The stream receiving apparatus according to claim 1, wherein: 3. The stream according to claim 1, wherein the stream data conversion unit rewrites the time management information of the stream data received by the data reception unit using the reception start time of the stream data as a reference value. Receiver device. The stream data received by the receiving unit includes encoded audio signals related to the video signal and time management information for managing the decoding reproduction time of the audio signal, and the video signal and the audio signal are It can be synchronized by time management information,
4. The stream receiving device according to claim 1, wherein the stream data conversion unit rewrites the time management information while maintaining synchronization between the video signal and the audio signal. 5. . Multiplexed data separation means for separating the stream data in which the time management information is rewritten by the stream data conversion means into first data relating to the video signal and second data relating to the audio signal;
Video signal decoding means for decoding the first data related to the separated video signal to generate a video signal;
Audio signal decoding means for decoding the second data related to the separated audio signal to generate an audio signal;
Video signal display means for displaying the video signal decoded by the video signal decoding means based on the rewritten time management information;
5. The stream receiving apparatus according to claim 4, further comprising: an audio signal reproducing unit that reproduces the audio signal decoded by the audio signal decoding unit based on the rewritten time management information. Data reception for receiving stream data to which video information and an audio signal related to the video signal are encoded and to which additional information including time management information for managing the decoding and reproduction time of the video signal and the audio signal is added Means,
Stream data conversion means for rewriting the time management information of the received stream data and converting the stream data;
Multiplexed data separation means for separating the stream data in which the time management information is rewritten into first data related to the video signal and second data related to the audio signal;
Video signal decoding means for decoding the first data related to the separated video signal to generate a video signal;
Audio signal decoding means for decoding the second data related to the separated audio signal to generate an audio signal;
Video signal display means for displaying the video signal decoded by the video signal decoding means based on the rewritten time management information;
A stream receiving apparatus comprising: an audio signal reproducing unit that reproduces the audio signal decoded by the audio signal decoding unit based on the rewritten time management information. The stream receiving apparatus according to any one of claims 1 to 6, wherein the stream data is a bit stream conforming to an MPEG system. A data generating means for encoding the video signal and generating stream data to which additional information including time management information for managing the decoding reproduction time of the video signal is provided;
Stream data conversion means for rewriting time management information of the stream data and converting the stream data;
Data recording means for recording the converted stream data;
A stream transmission apparatus comprising: stream data generated by the data generation means or data transmission means for transmitting the recorded stream data to the outside. The stream data converting means includes a header adding means for adding a system header indicating summary information of stream data generated by the data generating means, and a time management information rewriting means for rewriting time management information of the stream data. The stream transmitting apparatus according to claim 8, wherein Reference time acquisition means for acquiring a reference time of time management information to be rewritten by the stream data conversion means,
The stream transmission device according to claim 8 or 9, wherein the stream data conversion unit rewrites time management information of the stream data generated by the data generation unit based on the reference time. The data generation means encodes an audio signal associated with the video signal, adds additional information including time management information for managing a decoding reproduction time of the audio signal, and multiplexes the stream with the video signal Generate data,
11. The stream transmission apparatus according to claim 8, wherein the stream data conversion unit rewrites the time management information while maintaining synchronization between the video signal and the audio signal. . 12. The stream transmission apparatus according to claim 8, wherein the stream data is a bit stream conforming to the MPEG system. A data generating means for encoding the video signal and generating stream data to which additional information including time management information for managing the decoding reproduction time of the video signal is provided;
Data transmission means for transmitting the generated stream data to the outside;
Data receiving means for receiving the transmitted stream data from the middle;
Stream data conversion means for rewriting the time management information of the received stream data and converting the stream data;
A stream transmission / reception system comprising: data recording means for recording stream data with the time management information rewritten. 14. The stream transmission / reception system according to claim 13, wherein the stream data conversion unit rewrites the time management information of the stream data received by the data reception unit with the reception start time of the stream data as a reference value. The data generation means encodes an audio signal associated with the video signal, adds additional information including time management information for managing a decoding reproduction time of the audio signal, and multiplexes the stream with the video signal Generate data,
15. The stream transmission / reception system according to claim 13, wherein the stream data conversion unit rewrites the time management information while maintaining synchronization between the video signal and the audio signal. Multiplexed data separation means for separating the stream data in which the time management information has been rewritten in the stream data conversion means into first data related to the video signal and second data related to the audio signal;
Video signal decoding means for decoding the first data related to the separated video signal to generate a video signal;
Audio signal decoding means for decoding the second data related to the separated audio signal to generate an audio signal;
Video signal display means for displaying the video signal decoded by the video signal decoding means based on the rewritten time management information;
16. The audio signal reproducing means for reproducing the audio signal decoded by the audio signal decoding means based on the rewritten time management information. The stream transmission / reception system according to claim 1. A data generating means for encoding the video signal and generating stream data to which additional information including time management information for managing the decoding reproduction time of the video signal is provided;
Reference time acquisition means for acquiring reference time information for reproducing the generated stream data from the middle;
A stream data conversion means for converting the stream data by adding a system header representing summary information of the stream data, rewriting time management information of the stream data based on the reference time,
Data recording means for recording the converted stream data;
Data transmission means for transmitting the recorded stream data to the outside;
Data receiving means for receiving the transmitted stream data;
Decoding means for decoding the received stream data;
A stream transmission / reception system comprising: a reproduction unit that reproduces the signal decoded by the decoding unit based on the rewritten time management information. A stream transmission / reception system comprising the stream reception device according to any one of claims 1 to 7 and the stream transmission device according to any one of claims 8 to 12. A data receiving step for receiving stream data to which additional information including time management information for managing a video signal is encoded and time for decoding and reproducing the video signal;
A stream data conversion step of rewriting the time management information of the received stream data and converting the stream data;
A stream reception program comprising: a data recording step for recording stream data in which the time management information is rewritten. A data generation step of encoding the video signal and generating stream data to which additional information including time management information for managing a decoding reproduction time of the video signal is provided;
A stream data conversion step of rewriting the time management information of the stream data and converting the stream data;
A data recording step for recording the converted stream data;
A stream transmission program comprising: a data transmission step of transmitting the stream data generated in the data generation step or the recorded stream data to the outside. A data generation step of encoding the video signal and generating stream data to which additional information including time management information for managing a decoding reproduction time of the video signal is provided;
A data transmission step of transmitting the generated stream data to the outside;
A data receiving step for receiving the transmitted stream data from the middle;
A stream data conversion step of rewriting the time management information of the received stream data and converting the stream data;
A stream transmission / reception program comprising: a data recording step for recording stream data in which the time management information is rewritten.

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