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AUDIO_README.md

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Audio Operation Guideline

Contents

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Extract a MPEG-4 AAC stream from MMT stream file

  1. Get the MMT information
DumpTS 03001.mmts --showinfo
Layout of MMT:
    CID: 0X0(0):
        #0000 PLT (Package List Table):
            --------------------------------------------------------------------------------
            #00000 MPT (MMT Package Table), Package_id: 0X1(1), packet_id: 0X9000(36864):
                #00000 Asset, asset_id: 0X8(8), asset_type: hev1(0X68657631):
                    packet_id: 0X100(256)
                    ++++++++++++++ Descriptor: Video component Descriptor +++++++++++++
                              file offset: 5
                           descriptor_tag: 0X8010
                        descriptor_length: 8
                         video_resolution: 6(0X6), height: 2160
                       video_aspect_ratio: 3(0X3), 16:9 without pan vector
                          video_scan_flag: 1, progressive
                         video_frame_rate: 8(0X8), 60/1.001 fps
                            component_tag: 0(0X0)
                    trans_characteristics: 3(0X3), Rec. ITU-R BT.2020
                                 language: jpn (0X006A706E)
                #00001 Asset, asset_id: 0X18(24), asset_type: mp4a(0X6D703461):
                    packet_id: 0X110(272)
                    ++++++++++++++ Descriptor: MH-Audio component Descriptor +++++++++++++
                              file offset: 5
                           descriptor_tag: 0X8014
                        descriptor_length: 10
                           stream_content: 3(0X3), Sound stream by MPEG-4 AAC
                           Dialog_control: 0, Audio stream does not include dialog control information
                        Sound_handicapped: 0(0X0), Audio for the handicapped is not specified
                               Audio_mode: 3(0X3), 2/0 mode (stereo)
                            component_tag: 16(0X10)
                              stream_type: 17(0X11)
                      simulcast_group_tag: 255(0XFF)
                    ES_multi_lingual_flag: 0
                      main_component_flag: 1, main audio
                        quality_indicator: 1Mode 1
                            sampling_rate: 48 kHZ
                                 language: jpn (0X006A706E)

The total number of TLV packets: 135239.
The number of IPv4 TLV packets: 0.
The number of IPv6 TLV packets: 910.
The number of Header Compressed IP packets: 116378.
    CID: 0x0000, packet_id: 0x9000, count:                        299 - MPT
    CID: 0x0000, packet_id: 0x0000, count:                        299 - PA Message
    CID: 0x0000, packet_id: 0x0100, count:                    114,370 - HEVC Video Stream
    CID: 0x0000, packet_id: 0x0110, count:                      1,406 - MPEG-4 AAC Audio Stream
The number of Transmission Control Signal TLV packets: 0.
The number of Null TLV packets: 17951.
The number of other TLV packets: 0.
  1. Find the MPEG-4 AAC CID and packet_id
CID is 0x0000, and packet_id is 0x0110
  1. Export the MPEG-4 AAC audio stream
DumpTS 03001.mmts --CID=0 --pid=0x110 --output=03001_mmts_AAC.loas
Total cost: 3052.383000 ms
Total input TLV packets: 135239.
Total MMT/TLV packets with the packet_id(0X110): 1407
Total MFUs in MMT/TLV packets with the packet_id(0X110): 0
  1. Show the MPEG-4 AAC audio information
DumpTS 03001_mmts_AAC.loas --showinfo
[MP4AAC] Successfully located the syncword in LOAS AudioMuxElement.
Audio Stream#0:
AudioSpecificConfig:
    audioObjectType: 2(0X2)       // AAC LC
    samplingFrequencyIndex: 3(0X3)// 48000HZ
    channelConfiguration: 2(0X2)  // left, right front speakers
    GASpecificConfig:
        frameLengthFlag: 0(0X0)   // 1024/128 lines IMDCT is used and frameLength is set to 1024
        dependsOnCoreCoder: 0(0X0)// Signals that a core coder has been used in an underlying base layer...
        extensionFlag: 0(0X0)     // Shall be '0' for audio object types 1, 2, 3, 4, 6, 7. Shall be '1' ...
        Frame Duration: 21.333ms

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Show the channel layout and mapping

There are the below kinds of audio channel layout:

  • D-Cinema(SMPTE Standard 428M), AC3, DD+, Dolby True-HD and LPCM follow or inherit it
  • DTS/DTS-HD, DTS or DTS-HD audio stream
  • ITU-R BS.2051-2, MPEG2 AAC, MP4 AAC and ISOBMFF follow

For stereo AC3:

DumpTS 00015.m2ts --showinfo --pid=0x1100
AC3 Audio Stream information:
        PID: 0X1100.
        Stream Type: 129(0X81).
        Sample Frequency: 48000 (HZ).
        Bits Per Sample: 16.
        Channel Layout: 2ch(L, R)@D-Cinema.
        Bitrate: 192.000 kbps.

For 5.1ch AC3:

DumpTS 00016.m2ts --showinfo --pid=0x1100
AC3 Audio Stream information:
        PID: 0X1100.
        Stream Type: 129(0X81).
        Sample Frequency: 48000 (HZ).
        Bits Per Sample: 16.
        Channel Layout: 5.1ch(L, C, R, Ls, Rs, LFE)@D-Cinema.
        Bitrate: 640.000 kbps.

For 7.1ch DD+

DumpTS 00020.m2ts --showinfo --pid=0x1100
DD+ Audio Stream information:
        PID: 0X1100.
        Stream Type: 132(0X84).
        Sample Frequency: 48000 (HZ).
        Bits Per Sample: 16.
        Channel Layout: 7.1ch(L, C, R, Ls, Rs, LFE, Rls, Rrs)@D-Cinema.

For Mono Dolby True-HD/Atmos:

DumpTS 00022.m2ts --showinfo --pid=0x1100
Dolby Lossless Audio (TrueHD/Atmos) Stream information:
        PID: 0X1100.
        Stream Type: 131(0X83).
        Sample Frequency: 48000 (HZ).
        Bits Per Sample: 24.
        Channel Layout: 1ch(C)@D-Cinema.

For 2ch Dolby True-HD/Atmos

DumpTS 00023.m2ts --showinfo --pid=0x1100
Dolby Lossless Audio (TrueHD/Atmos) Stream information:
        PID: 0X1100.
        Stream Type: 131(0X83).
        Sample Frequency: 96000 (HZ).
        Bits Per Sample: 24.
        Channel Layout: 2ch(Rls, Rrs)@D-Cinema.

For 6ch Dolby True-HD/Atmos

DumpTS 00024.m2ts --showinfo --pid=0x1100
Dolby Lossless Audio (TrueHD/Atmos) Stream information:
        PID: 0X1100.
        Stream Type: 131(0X83).
        Sample Frequency: 192000 (HZ).
        Bits Per Sample: 24.
        Channel Layout: 5.1ch(L, C, R, Ls, Rs, LFE)@D-Cinema.

For stereo DTS:

DumpTS 00017.m2ts --showinfo --pid=0x1100
DTS Audio Stream information:
        PID: 0X1100.
        Stream Type: 130(0X82).
        Sample Frequency: 48000 (HZ).
        Bits Per Sample: 16.
        Channel Layout: 2ch(L, R)@DTS/DTSHD.
        Bitrate: 384.000 kbps.

For 5.1ch DTS:

DumpTS 00018.m2ts --showinfo --pid=0x1100
DTS Audio Stream information:
        PID: 0X1100.
        Stream Type: 130(0X82).
        Sample Frequency: 48000 (HZ).
        Bits Per Sample: 0.
        Channel Layout: 5.1ch(C, L, R, Ls, Rs, LFE1)@DTS/DTSHD.
        Bitrate: 0.000 Mbps.

For 7.1ch DTS-HD:

DumpTS 00025.m2ts --showinfo --pid=0x1100
DTS-HD audio Stream information:
        PID: 0X1100.
        Stream Type: 133(0X85).
        Sample Frequency: 48000 (HZ).
        Bits Per Sample: 16.
        Channel Layout: 7.1ch(C, L, R, Ls, Rs, LFE1, LSr, Rsr)@DTS/DTSHD.

For 6.1ch DTS-HD:

DumpTS 00026.m2ts --showinfo --pid=0x1100
DTS-HD audio Stream information:
        PID: 0X1100.
        Stream Type: 133(0X85).
        Sample Frequency: 96000 (HZ).
        Bits Per Sample: 24.
        Channel Layout: 6.1ch(C, L, R, Ls, Rs, LFE1, Cs)@DTS/DTSHD.

For 5.1ch DTS-HD:

DumpTS 00027.m2ts --showinfo --pid=0x1100
DTS-HD audio Stream information:
        PID: 0X1100.
        Stream Type: 133(0X85).
        Sample Frequency: 48000 (HZ).
        Bits Per Sample: 16.
        Channel Layout: 5.1ch(C, L, R, Ls, Rs, LFE1)@DTS/DTSHD.

DTS 5.1ch DTS-HD lossless@24bit@192KHZ:

DumpTS 00028.m2ts --showinfo --pid=0x1100
DTS-HD Lossless Audio Stream information:
        PID: 0X1100.
        Stream Type: 134(0X86).
        Sample Frequency: 192000 (HZ).
        Bits Per Sample: 24.
        Channel Layout: 5.1ch(C, L, R, Ls, Rs, LFE1)@DTS/DTSHD.

For stereo LPCM:

DumpTS 00013.m2ts --showinfo --pid=0x1100
HDMV LPCM Audio Stream information:
        PID: 0X1100.
        Stream Type: 128(0X80).
        Sample Frequency: 48000 (HZ).
        Bits Per Sample: 16.
        Channel Layout: 2ch(L, R)@D-Cinema.

For 5.1ch LPCM:

DumpTS 00019.m2ts --showinfo --pid=0x1100
HDMV LPCM Audio Stream information:
        PID: 0X1100.
        Stream Type: 128(0X80).
        Sample Frequency: 192000 (HZ).
        Bits Per Sample: 24.
        Channel Layout: 5.1ch(L, C, R, Ls, Rs, LFE)@D-Cinema.

For Mono MPEG2 AAC

DumpTS Mono_AAC_test.m2ts --showinfo --pid=0x110
AAC Audio Stream information:
        PID: 0X110.
        Stream Type: 15(0X0F).
        Sample Frequency: 48000 (HZ).
        Bits Per Sample: 16.
        Channel Layout: 1ch(C)@ITU-R BS.

For Dual-Mono MPEG2 AAC

DumpTS DualMono_AAC_test.m2ts --showinfo --pid=0x110
AAC Audio Stream information:
        PID: 0X110.
        Stream Type: 15(0X0F).
        Sample Frequency: 48000 (HZ).
        Bits Per Sample: 16.
        Channel Layout: 2ch (Dual-Mono).

For 5.1ch to stereo MPEG2 AAC

DumpTS 5.1ch_stereo.m2ts --showinfo --pid=0x110
AAC Audio Stream information:
        PID: 0X110.
        Stream Type: 15(0X0F).
        Sample Frequency: 48000 (HZ).
        Bits Per Sample: 16.
        Channel Layout: 5.1ch(L, R, C, LFE, Ls, Rs)@ITU-R BS.
AAC Audio Stream information:
        PID: 0X110.
        Stream Type: 15(0X0F).
        Sample Frequency: 48000 (HZ).
        Bits Per Sample: 16.
        Channel Layout: 2ch(L, R)@ITU-R BS.

For stereo MPEG4 AAC

DumpTS 00001.m2ts --showinfo --pid=0x1100
MPEG4 AAC Audio Stream information:
        PID: 0X1100.
        Stream Type: 17(0X11).
        Sample Frequency: 48000 (HZ).
        Bits Per Sample: 16.
        Channel Layout: 2ch(L, R)@ITU-R BS.

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Show MPEG4 AAC StreamMuxConfig

Show StreamMuxConfig syntax fields of the MPEG4 AAC stream,

DumpTS test.loas --showStreamMuxConfig

And then,

[MP4AAC] Successfully located the syncword in LOAS AudioMuxElement.
Updated Stream Mux Config:
audioMuxVersion: 0
audioMuxVersionA: 0                                            // default
streamCnt: 0                                                   // The count of streams present in this structure
allStreamsSameTimeFraming: 1                                   // A data element indicating whether all payloads, which are multiplex...
numSubFrames: 0(0X0)                                           // 1 PayloadMux() frames are multiplexed
numProgram: 0(0X0)                                             // 1 programs are multiplexed
for (prog = 0; prog <= numProgram:0; prog++):
    numLayer[0]: 0                                             // 1 scalable layers are multiplexed
    for (lay = 0; lay <= numLayer:0; lay++):
        progSIndx[streamCnt:0]: 0(0X0)
        laySIndx[streamCnt:0]: 0(0X0)
        streamID[prog:0][lay:0]=0: 0(0X0)
        useSameConfig: 0                                       // AudioSpecificConfig() is present
        AudioSpecificConfig():
            AudioSpecificConfig:
                audioObjectType: 2(0X2)                        // AAC LC
                samplingFrequencyIndex: 3(0X3)                 // 48000HZ
                channelConfiguration: 2(0X2)                   // left, right front speakers
                GASpecificConfig:
                    frameLengthFlag: 0(0X0)                    // 1024/128 lines IMDCT is used and frameLength is set to 1024
                    dependsOnCoreCoder: 0(0X0)                 // Signals that a core coder has been used in an underlying base layer...
                    extensionFlag: 0(0X0)                      // Shall be '0' for audio object types 1, 2, 3, 4, 6, 7. Shall be '1' ...
        frameLengthType[streamID[prog:0][lay:0]:0]: 0(0X0)     // Payload with variable frame length
        latmBufferFullness[streamID[prog:0][lay:0]:0]: 96(0X60)// the state of the bit reservoir in the course of encoding the first ...
otherDataPresent: 0                                            // The other data than audio payload otherData is not multiplexed
crcCheckPresent: 1                                             // CRC check bits are present
crcCheckSum: 109(0X6D)                                         // CRC error detection data
Updated Stream Mux Config:
audioMuxVersion: 0
audioMuxVersionA: 0                                             // default
streamCnt: 0                                                    // The count of streams present in this structure
allStreamsSameTimeFraming: 1                                    // A data element indicating whether all payloads, which are multiplex...
numSubFrames: 0(0X0)                                            // 1 PayloadMux() frames are multiplexed
numProgram: 0(0X0)                                              // 1 programs are multiplexed
for (prog = 0; prog <= numProgram:0; prog++):
    numLayer[0]: 0                                              // 1 scalable layers are multiplexed
    for (lay = 0; lay <= numLayer:0; lay++):
        progSIndx[streamCnt:0]: 0(0X0)
        laySIndx[streamCnt:0]: 0(0X0)
        streamID[prog:0][lay:0]=0: 0(0X0)
        useSameConfig: 0                                        // AudioSpecificConfig() is present
        AudioSpecificConfig():
            AudioSpecificConfig:
                audioObjectType: 2(0X2)                         // AAC LC
                samplingFrequencyIndex: 3(0X3)                  // 48000HZ
                channelConfiguration: 6(0X6)                    // center front speaker, left, right front speakers,left surround, rig...
                GASpecificConfig:
                    frameLengthFlag: 0(0X0)                     // 1024/128 lines IMDCT is used and frameLength is set to 1024
                    dependsOnCoreCoder: 0(0X0)                  // Signals that a core coder has been used in an underlying base layer...
                    extensionFlag: 0(0X0)                       // Shall be '0' for audio object types 1, 2, 3, 4, 6, 7. Shall be '1' ...
        frameLengthType[streamID[prog:0][lay:0]:0]: 0(0X0)      // Payload with variable frame length
        latmBufferFullness[streamID[prog:0][lay:0]:0]: 149(0X95)// the state of the bit reservoir in the course of encoding the first ...
otherDataPresent: 0                                             // The other data than audio payload otherData is not multiplexed
crcCheckPresent: 1                                              // CRC check bits are present
crcCheckSum: 54(0X36)                                           // CRC error detection data

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