| Byte offset | Field | Number of bits | Value | Description |
|---|
| 0 | sub_stream_id | 8 | 1010 0***b | *** = Audio stream number |
| 1 | number_of_frame_headers | 8 | 0xnnnn | Number of audio frames whose first byte is in this pack |
| 2 | first_access_unit_pointer | 16 | 0xnnnn | Pointer to the first byte of the first frame that the PES PTS applies to. |
| 4 | audio_emphasis_flag | 1 | 0 = off, 1 = on | |
| | audio_mute_flag | 1 | 0 = off, 1 = on | |
| | reserved | 1 | | |
| | audio_frame_number | 5 | | Frame number within Group of Audio frames. |
| 5 | quantisation_word_length | 2 | 0 = 16, 1 = 20, 2 = 24, 3 = reserved | Bits per sample |
| | audio_sample_frequency | 2 | 0 = 48, 1 = 96, other = reserved | Sampling frequency in kHz. |
| | reserved | 1 | | |
| | number_of_audio_channels | 3 | X + 1 | 0 = 1ch, 1 = 2ch etc. |
| 6 | dynamic_range X | 3 | X | High 3 bits of byte. |
| | dynamic_range Y | 5 | Y | Lower 5 bits of byte | .
| | | | | linear gain = 2^(4-(X+(Y/30))) |
| | | | | in dB gain = 24.082 - 6.0206 X - 0.2007 Y |
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