DICOM PS3.5 2020d - Data Structures and Encoding

8.2.12 Constraints for Audio Data Integration in AVC and HEVC Compressed Bit Streams (Current)
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### 8.2.12 Constraints for Audio Data Integration in AVC and HEVC Compressed Bit Streams

This section describes the constraints pertaining to the presence of audio data alongside pixel data in DICOM objects. It affects the following pixel data encapsulation Transfer Syntaxes:

- MPEG-4 AVC/H.264 High Profile / Level 4.1

- MPEG-4 AVC/H.264 BD-compatible High Profile / Level 4.1

- MPEG-4 AVC/H.264 High Profile / Level 4.2 For 2D Video

- MPEG-4 AVC/H.264 High Profile / Level 4.2 For 3D Video

- MPEG-4 AVC/H.264 Stereo High Profile / Level 4.2

- HEVC/H.265 Main Profile / Level 5.1

- HEVC/H.265 Main 10 Profile / Level 5.1

Any audio components present within a bit stream whose Transfer Syntax is among those listed above shall be interleaved in either LPCM, AC-3, AAC, MP3 or MPEG-1 Layer II audio format and shall comply with the following restrictions:

Table 8.2.12-1. Allowed Audio Formats

Audio Format | MPEG-2 TS Container | MP4 Container
--- | --- | ---
LPCM | Allowed | -
AC3 | Allowed | -
AAC | Allowed | Allowed
MP3 | Allowed | Allowed
MPEG-1 Audio Layer II | Allowed | Allowed

- LPCM

  - Maximum bit rate: 4.608 Mbps

  - Sampling frequency: 48, 96 kHz

  - Bits per sample: 16, 20 or 24 bits

  - Number of channels: 2 channels

  ### Note

  If LPCM is used for Audio components, the container format shall be MPEG-2 TS.

- AC-3

  - Maximum bit rate: 640kbps

  - Sampling frequency: 48kHz

  - Bits per sample: 16 bits

  - Number of channels: 2 or 5.1 channels

  ### Note

  1. AC-3 is standardized in [ETSI TS 102 366]

  2. If AC-3 is used for Audio components, the container format shall be MPEG-2 TS.

- AAC

  - Maximum bit rate: 640kbps

  - Sampling frequency: 48kHz

  - Bits per sample: 16, 20 or 24 bits

  - Number of channels: 2 or 5.1 channels

  ### Note

  AAC is standardized in Part 7 of the MPEG-2 standard (see [ISO/IEC 13818-7], and Subpart 4 in Part 3 of the MPEG-4 standard (see [ISO/IEC 14496-3]).

- CBR MPEG-1 LAYER III (MP3) Audio Standard

  - Maximum bit rate: 320kbps

  - Sampling frequency: 32 kHz, 44.1 kHz or 48 kHz for the main channel (the complementary channels can be sampled at the half rate, as defined in the Standard)

  - Bits per sample: up to 24 bits

  - Number of channels: one main mono or stereo channel, and optionally one or more complementary channel(s)

  ### Note

  1. MPEG-1 Layer III is standardized in Part 3 of the MPEG-1 standard (see [ISO/IEC 11172-3]).

  2. Although MPEG describes each channel as including up to 5 signals (e.g., for surround effects), it is recommended to limit each of the two channels to 2 signals each one (stereo).

- MPEG-1 LAYER II (MP2)

  - Maximum bit rate: 384kbps

  - Sampling frequency: 32 kHz, 44.1 kHz or 48 kHz

  - Bits per sample: up to 24 bits

  - Number of channels: 2

  ### Note

  MPEG-1 Layer II is standardized in Part 3 of the MPEG-1 standard (see [ISO/IEC 11172-3]).

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DICOM PS3.5 2020d - Data Structures and Encoding