JP3849975B2 - Audio / video information recording apparatus and method, and audio / video information reproducing apparatus and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an audio / video information recording apparatus and method for compressing a video signal and an audio signal in real time and recording them on a recording medium such as an optical disc, and to expand and reproduce the video signal and the audio signal recorded on the recording medium. The present invention relates to an audio / video information reproducing apparatus and method.
[0002]
[Prior art]
As a method for compressing video data at a low bit rate, there is a system stream defined by the MPEG2 standard (ISO / IEC 13818-1). Three types of system streams are defined: a program stream, a transport stream, and a PES (Packetized Elementary Stream) stream.
[0003]
On the other hand, optical disks such as phase change optical disks (for example, DVD-RAM and MVDISC) and magneto-optical disks (MO) have been attracting attention as recording media replacing magnetic tapes. For example, there is a VIDEO RECORDING standard (DVD Specifications for Rewritable / Re-recordable Discs Part 3 VIDEO RECORDING Version 1.0 September 1999) as a standard for recording video on a DVD-RAM. This standard is for recording and reproducing a moving image file composed of a program stream of the MPEG2 standard on a DVD-RAM disk.
[0004]
In some cases, a moving image file composed of an MPEG2 transport stream defined by ISO / IEC 13818-1 is recorded on and reproduced from a phase change optical disk. In this case, the video data is compressed by MPEG2 specified by ISO / IEC 13818-2, and the audio data is compressed by MPEG2-AAC (Advanced Audio Cording) specified by ISO / IEC 13818-7, for example.
[0005]
FIG. 3 shows a configuration diagram of a transport stream real-time recording / reproducing apparatus 300 using a conventional phase change optical disk. In FIG. 3, at the time of recording a video signal and an audio signal, signals input from the video signal input unit 100 and the audio signal input unit 102 are compressed by the video compression unit 101 and the audio compression unit 103, respectively, and then the system encoding unit 104 A transport stream is created and written to the phase change optical disk 131 via the recording unit 120 and the pickup 130. Here, the video compression unit 101, the audio compression unit 103, and the system encoding unit 104 constitute an MPEG encoder 170.
[0006]
At the time of reproduction of the video signal and the audio signal, the transport stream taken out via the pickup 130 and the reproduction unit 121 is separated into the video signal and the audio signal by the system decoding unit 114, and the video expansion unit 111 and the audio expansion unit 113, respectively. To the video display unit 110 and the audio output unit 112. Here, an MPEG decoder 171 is configured by the video decompression unit 111, the audio decompression unit 113, and the system decoding unit 114.
[0007]
When recording a video signal and an audio signal, the recording control unit 161 controls the recording unit 120, the continuous data area detection unit 160, and the logical block management unit 163 to perform recording. At this time, the continuous data area detection unit 160 checks the usage status of the sectors managed by the logical block management unit 163 in accordance with an instruction from the recording control unit 161, and detects physically continuous free areas. When recording is completed, a moving image file composed of a transport stream is created.
[0008]
At the time of reproduction of a video signal and an audio signal, the reproduction control unit 162 controls the reproduction unit 121 to perform reproduction.
[0009]
When the recorded moving image file is output to the outside in the isochronous transfer mode via the IEEE 1394 interface unit (1394 i / f unit) 140, the 1394 playback control unit 164 outputs the transport stream read through the playback unit 121 to the transport stream. On the other hand, the transmission timing is calculated by the output timing generation unit 141, and the transport stream is transferred to the 1394 i / f unit 140 according to the calculated transmission timing.
[0010]
On the other hand, when the moving image file is input from the outside via the 1394 i / f unit 140 in the isochronous transfer mode, the recording control unit 161 controls the recording unit 120, the continuous data area detection unit 160, and the logical block management unit 163. And record.
[0011]
FIG. 4 is a diagram showing a recording form when video is recorded on the phase change optical disc 131 in real time. In FIG. 4, the phase change optical disk 131 is composed of 2 kbyte sectors, and 16 sectors are handled as one logical block (32 kbytes), and an error correction code is assigned to each logical block to the phase change optical disk 131. It comes to record.
[0012]
Furthermore, a physically continuous logical block having a data size of at least a predetermined time (maximum reading rate when the reproducing unit 121 reads out from the phase change optical disk 131, for example, data of 0.5 seconds). One continuous data area is secured, and a movie object unit (Movie Object Unit: hereinafter referred to as “MOBU”), which is a unit video packet composed of an MPEG transport stream for 0.4 to 1 second, is reserved in this area. Record in order.
[0013]
One MOBU is composed of transport packets which are lower layers of an MPEG transport stream of 188 bytes. The transport packet includes a video transport packet (V_TSP) in which compressed video data is stored, an audio transport packet (A_TSP) in which audio compressed data is stored, and a program association table transport packet (PAT_TSP). ) And a program map table transport packet (PMT_TSP).
[0014]
One MOBU includes all V_TSPs corresponding to the time. Further, one MOBU includes all A_TSPs including audio frames necessary in terms of timing in order to satisfy T-STD (Transport Stream System Target Decoder). That is, the audio frame is completed within the MOBU. Also, the data size of one MOBU varies within a range equal to or less than the maximum recording / reproduction rate if the moving image is a variable bit rate. On the other hand, if the moving image is a fixed bit rate, the data size of the MOBU is almost constant.
[0015]
FIG. 5 is a diagram illustrating details of V_TSP, A_TSP, PAT_TSP, and PMT_TSP. As shown in FIG. 5, V_TSP is composed of a transport packet header and video data, A_TSP is composed of a transport packet header and audio data, and PAT_TSP is mainly composed of a transport packet header and a program association table. The PMT_TSP mainly includes a transport packet header and a program map table.
[0016]
Four of V_TSP, A_TSP, PAT_TSP, and PMT_TSP are identified by PID (Packet ID) in the transport packet header. For example, as shown in FIG. 5, PID = "0x0020" is detected for V_TSP, PID = "0x0021" for A_TSP, PID = "0x0000" for PAT_TSP, and PID = "0x0030" for PMT_TSP.
[0017]
Here, the assignment status of PIDs for V_TSP and A_TSP is recorded in the program map table in PMT_TSP. The PID for PAT_TSP takes a fixed value of “0x0000”.
[0018]
The continuous data area detector 160 of the information recording / reproducing apparatus shown in FIG. 3 performs re-detection of the next continuous data area when the remaining one continuous data area is reduced. When one continuous data area becomes full, data is written to the next continuous data area.
[0019]
FIG. 6 is a diagram showing a connection form when dubbing a moving image file between information recording / reproducing apparatuses. In FIG. 6, one information recording / reproducing apparatus 501 and the other information recording / reproducing apparatus 502 are connected using an IEEE 1394 interface cable (1394 i / f cable) 503. The moving image file recorded in the information recording / reproducing apparatus 501 is isochronous for MPEG transport stream transmission from the internal 1394 i / f section 140 to the 1394 i / f section 140 of the information recording / reproducing apparatus 502 via the IEEE 1394 interface cable 503. It is transmitted in the transfer mode and recorded as a moving image file in the information recording / reproducing apparatus 502 on the receiving side.
[0020]
[Problems to be solved by the invention]
As described above, when a recorded moving image file is dubbed between the conventional information recording / reproducing apparatuses via the 1394 i / f cable 503, the information recording / reproducing apparatus 502 on the receiving side determines the boundary of the MOBU. After checking a set of at least three consecutive transport packets (PAT_TSP, PMT_TSP, and V_TSP), it is necessary to check whether the third packet is V_TSP and that the packet has a sequence header. There is a problem that the determination process becomes complicated.
[0021]
Further, when the transport stream is composed only of audio (A_TSP), for example, a constant number of audio frames corresponding to about 1 second is recorded as a recording unit corresponding to MOBU. When such a stream is similarly dubbed, the receiving side information recording / reproducing apparatus 502 uses a set of at least three consecutive transport packets (PAT_TSP, PMT_TSP, and A_TSP) in order to determine the boundary of the MOBU. After the check, the third packet is A_TSP, and it is necessary to check whether or not the packet is the head of the voice frame, which again complicates the determination process. In addition, since the data structure at the head of the frame is different for each of various audio compression formats (for example, MPEG audio, Dolby AC3 in addition to AAC), the content of determination processing for determining whether or not it is the head of the audio frame is switched for each audio compression format. There was a problem of necessity and complexity.
[0022]
The present invention has been made in view of the above problems, and an object thereof is a recording unit on the receiving side when dubbing a moving image file composed of a plurality of recording units between apparatuses by IEEE 1394 isochronous transmission. An object of the present invention is to provide an information recording apparatus and method, and an information reproducing apparatus and method that can easily detect the boundary of the MOBU and can easily restore the management information for each MOBU held on the transmitting side on the receiving side.
[0023]
[Means for Solving the Problems]
To achieve the above object, an audio / video information recording apparatus according to the present invention records audio / video information as an MPEG transport stream composed of MPEG transport packets, at least one of video information and audio information. The audio / video information recording unit treats a set of predetermined MPEG transport packets as one recording unit, a data stream in which a plurality of recording units are continuous as an MPEG transport stream, and the beginning of the recording unit The MPEG transport packet is recorded so as to include identification information indicating the beginning of the recording unit.
[0024]
In the audio / video information recording apparatus according to the present invention, the identification information is preferably a value of a transport priority indicator.
[0025]
In order to achieve the above object, an audio / video information reproducing apparatus according to the present invention includes an audio / video information reproducing unit for outputting a recorded MPEG transport packet, and the audio / video information reproducing unit has a predetermined MPEG. Handle a set of transport packets as one recording unit, and output multiple recording units continuously while including identification information indicating the beginning of the recording unit in the MPEG transport packet at the beginning of the recording unit. It is characterized by.
[0026]
In the audio / video information reproducing apparatus according to the present invention, the identification information is preferably a value of a transport priority indicator.
[0027]
To achieve the above object, an audio / video information recording method according to the present invention records audio / video information as an MPEG transport stream composed of MPEG transport packets, at least one of video information and audio information. A recording method in which a predetermined set of MPEG transport packets is treated as one recording unit, a data stream in which a plurality of recording units are continuous is defined as an MPEG transport stream, and the first MPEG transport packet in the recording unit is recorded. It is recorded so that the identification information which shows that it is the head of a unit is included.
[0028]
In the audio / video information recording method according to the present invention, the identification information is preferably a value of a transport priority indicator.
[0029]
In order to achieve the above object, an audio / video information reproducing method according to the present invention is an audio / video information reproducing method for outputting a recorded MPEG transport packet. A plurality of recording units are continuously output while including identification information indicating the beginning of the recording unit in the MPEG transport packet at the beginning of the recording unit.
[0030]
In the audio / video information reproducing method according to the present invention, the identification information is preferably a value of a transport priority indicator.
To achieve the above object, an audio / video information processing apparatus according to the present invention includes an audio / video information receiving unit that receives an MPEG transport packet including at least one of video information and audio information, and The video information receiving unit regards a predetermined set of received MPEG transport packets as a recording unit, detects identification information included in the first MPEG transport packet of the recording unit, and uses the identification information to detect the recording unit. It is characterized by identifying.
In the audio / video information recording method according to the present invention, it is preferable that the identification information is a predetermined value of a transport priority indicator.
To achieve the above object, an audio / video information processing method according to the present invention is an audio / video information processing method for receiving an MPEG transport packet including at least one of video information and audio information. The received MPEG transport packet set is regarded as a recording unit, identification information included in the first MPEG transport packet of the recording unit is detected, and the recording unit is identified by the identification information. .
In the audio / video information recording method according to the present invention, it is preferable that the identification information is a predetermined value of a transport priority indicator.
In the audio / video information recording apparatus according to the present invention, it is preferable that timing information is individually added to the MPEG transport packet.
In the audio / video information processing apparatus according to the present invention, it is preferable that timing information is individually added to the MPEG transport packet.
In the audio / video information recording method according to the present invention, it is preferable that timing information is individually added to each of the MPEG transport packets.
In the audio / video information processing method according to the present invention, it is preferable that timing information is individually added to each of the MPEG transport packets.
[0031]
According to the above configuration, when a recorded moving image file is dubbed between apparatuses by IEEE 1394 isochronous transmission, it is possible to easily detect the boundary of the MOBU which is a recording unit on the receiving side.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0033]
FIG. 1 is a block diagram showing a configuration of an information recording / reproducing apparatus 200 according to an embodiment of the present invention. The processing content of the 1394 playback control unit 164 is different between this embodiment and the conventional example shown in FIG. The configuration and function of the other parts are the same as those in the prior art, and the same reference numerals are given and description thereof is omitted.
[0034]
FIG. 2 is a diagram illustrating a data structure of a moving image file in the present embodiment. In FIG. 2, the transport packets constituting the MOBU are the same as the conventional ones. However, the difference between this embodiment and the conventional example is that the value of the transport priority indicator field in the transport packet header in the PAT_TSP at the head of the MOBU is “1” (transport priority = 1). Therefore, the value of the transport priority indicator field in the PAT_TSP at other positions is “0” (transport priority = 0).
[0035]
When dubbing a moving image file, the boundary of the MOBU can be detected only by detecting a transport packet having a transport priority indicator field value of “1” and a PID of “0 (zero)”. As a result, on the receiving side, it is possible to easily create the start address of each MOBU as management information for facilitating reproduction from the moving image file. That is, only one transport packet header in the transport stream needs to be evaluated.
[0036]
In this embodiment, the transport priority indicator in the transport packet header is used. Instead, the transport private data field is used only in the transport packet header of the MOBU head transport packet. Data indicating the beginning of the MOBU (for example, a 4-byte character “MOBU”) may be inserted.
[0037]
As described above, according to the present embodiment, when a recorded moving image file is dubbed between apparatuses by IEEE1394 isochronous transmission, the boundary of the MOBU that is a recording unit can be easily detected on the receiving side. Become. This makes it possible to easily restore management information for each MOBU held on the transmission side on the reception side.
[0038]
In the present embodiment, the head of MOBU, which is a recording unit, is composed of PAT_TSP, but other V_TSP and other transport packets may be used.
[0039]
In this embodiment, the MOBU that is a recording unit is output as it is from the IEEE 1394 interface unit 140 as it is, but a transport packet having a specific PID may be excluded at the time of output. In this case, it is only necessary that the priority indicator value of the first transport packet among the transport packets not having the specific PID in the MOBU is “1”.
[0040]
In the present embodiment, the value of the priority indicator of the transport packet at the beginning of the MOBU is “1” at the time of recording. However, the value of the priority indicator is always set to “0” at the time of recording. Alternatively, the value may be changed to “1” immediately before output from the IEEE 1394 interface unit 140 to the outside.
[0041]
In the present embodiment, the recorded moving image file is a transport stream composed of 188-byte packets, but may be a data stream composed of packets having a data size other than 188 bytes. For example, a transport packet transmitted through the IEEE 1394 interface has 192 bytes, which is 188 bytes plus 4 bytes of timing information, as a unit, but such a data stream may be recorded. However, in this case, since the MPEG stream that can be transmitted on the IEEE 1394 interface is limited to the transport stream, it is necessary to discard the added 4 bytes at the time of transmission. Needless to say, the packets constituting the moving image file to be recorded may be a data stream composed of packets having a data size other than 188 bytes.
[0042]
In this embodiment, the storage medium is a phase change optical disk (phase change optical disk 131). However, the present invention is not limited to this. For example, a DVD-RAM, MO (magneto-optical disk), DVD-R , DVD-RW, DVD + RW, CD-R, CD-RW and other optical disks and recording media having a disk shape such as a hard disk, magnetic tape, and semiconductor memory such as flash memory.
[0043]
【The invention's effect】
As described above, according to the present invention, when a recorded moving image file is dubbed between apparatuses by IEEE 1394 isochronous transmission, the boundary of MOBU which is a recording unit can be easily detected on the receiving side, and the transmitting side holds it. The management information for each MOBU that has been stored can be easily restored on the receiving side.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a functional configuration of an audio / video information recording / reproducing apparatus according to an embodiment of the present invention. FIG. 2 is a diagram showing a data structure of a moving image file in the information recording / reproducing apparatus of FIG. FIG. 4 is a block diagram showing a functional configuration of a conventional audio / video information recording / reproducing apparatus. FIG. 4 is a diagram showing a data structure of a moving image file in a conventional information recording / reproducing apparatus. 6] Diagram showing the connection form when dubbing a video file between audio / video information recording / reproducing devices
100 video signal input unit 101 video compression unit 102 audio signal input unit 103 audio compression unit 104 system encoding unit 110 video display unit 111 video expansion unit 112 audio output unit 113 audio expansion unit 114 system decoding unit 120 recording unit 121 reproduction unit 130 pickup 131 Phase change optical disk 140 IEEE1394 interface part (1394i / f part)
141 Output Timing Generation Unit 160 Continuous Data Area Detection Unit 161 Recording Control Unit 162 Playback Control Unit 163 Logical Block Management Unit 164 1394 Playback Control Unit 170 MPEG Encoder 171 MPEG Decoder 200, 300 Audio / Video Information Recording / Reproduction Device

Claims (16)

An audio / video information recording unit that records at least one of video information and audio information as an MPEG transport stream composed of MPEG transport packets;
The audio / video information recording unit treats a set of predetermined MPEG transport packets as one recording unit, a data stream in which a plurality of recording units are continuous as the MPEG transport stream, and the top of the recording unit. An audio / video information recording apparatus, wherein an MPEG transport packet is recorded so as to include identification information indicating the beginning of the recording unit.   2. The audio / video information recording apparatus according to claim 1, wherein the identification information is a value of a transport priority indicator. An audio / video information reproducing unit for outputting the recorded MPEG transport packet;
The audio / video information reproducing section, including identification information indicating that treats a set of predetermined MPEG transport packets as one recording unit, a head of the recording unit at the head of the MPEG transport packet of the recording unit Mase while, audio / video information reproducing apparatus characterized by continuously outputting a plurality of said recording unit.   4. The audio / video information reproducing apparatus according to claim 3, wherein the identification information is a predetermined value of a transport priority indicator. An audio / video information recording method for recording at least one of video information and audio information as an MPEG transport stream composed of MPEG transport packets,
A set of predetermined MPEG transport packets is treated as one recording unit, a data stream in which a plurality of recording units are continuous is used as the MPEG transport stream, and the first MPEG transport packet of the recording unit is the recording unit. An audio / video information recording method comprising recording so as to include identification information indicating the head.   6. The audio / video information recording method according to claim 5, wherein the identification information is a predetermined value of a transport priority indicator. An audio / video information reproducing method for outputting a recorded MPEG transport packet,
A predetermined set of MPEG transport packets is treated as one recording unit, and a plurality of the recording units are included while including identification information indicating the beginning of the recording unit in the first MPEG transport packet of the recording unit. A method of reproducing audio / video information, wherein the audio / video information is output continuously.   8. The audio / video information reproducing method according to claim 7, wherein the identification information is a predetermined value of a transport priority indicator. An audio / video information receiving unit for receiving an MPEG transport packet including at least one of video information and audio information;
The audio / video information receiving unit regards a predetermined set of received MPEG transport packets as a recording unit, detects identification information included in the first MPEG transport packet of the recording unit, and uses the identification information to detect the identification information. An audio / video information processing apparatus characterized by identifying a recording unit. 10. The audio / video information recording method according to claim 9, wherein the identification information is a predetermined value of a transport priority indicator. An audio / video information processing method for receiving an MPEG transport packet including at least one of video information and audio information,
A predetermined set of the received MPEG transport packets is regarded as a recording unit, identification information included in the first MPEG transport packet of the recording unit is detected, and the recording unit is identified by the identification information. Audio / video information processing method. The identification information is a transport priority indicator. The audio / video information recording method according to claim 11, wherein the audio / video information recording method is a predetermined value. 3. The audio / video information recording apparatus according to claim 1, wherein timing information is individually added to each of the MPEG transport packets. 11. The audio / video information processing apparatus according to claim 9, wherein timing information is individually added to each of the MPEG transport packets. 7. The audio / video information recording method according to claim 5, wherein timing information is individually added to the MPEG transport packet. 13. The audio / video information processing method according to claim 11, wherein timing information is individually added to each of the MPEG transport packets.

Images