Audio Storage and Transport
| Standard | Description | |
|---|---|---|
| Multiplex | ISO/IEC 14496-1 | MPEG-4 Multiplex scheme (M4Mux) |
| Multiplex | ISO/IEC 14496-3 | Low Overhead Audio Transport Multiplex (LATM) |
| Storage | ISO/IEC 14496-3 (informative) | Audio Data Interchange Format (ADIF) - only for AAC |
| Storage | ISO/IEC 14496-12 | MPEG-4 file format (MP4) / ISO base media file format |
| Transmission | ISO/IEC 14496-3 (informative) | Audio Data Transport Stream (ADTS) - only for AAC |
| Transmission | ISO/IEC 14496-3 | Low Overhead Audio Stream (LOAS), based on LATM |
There is no standard for transport of elementary streams over a channel, because the broad range of MPEG-4 applications have delivery requirements that are too wide to easily characterize with a single solution.
The capabilities of a transport layer and the communication between transport, multiplex, and demultiplex functions are described in the Delivery Multimedia Integration Framework (DMIF) in ISO/IEC 14496-6. A wide variety of delivery mechanisms exist below this interface, e.g., MPEG transport stream, Real-time Transport Protocol (RTP), etc.
Transport in Real-time Transport Protocol is defined in RFC 3016 (RTP Payload Format for MPEG-4 Audio/Visual Streams), RFC 3640 (RTP Payload Format for Transport of MPEG-4 Elementary Streams), RFC 4281 (The Codecs Parameter for "Bucket" Media Types) and RFC 4337 (MIME Type Registration for MPEG-4).
LATM and LOAS were defined for natural audio applications, which do not require sophisticated object-based coding or other functions provided by MPEG-4 Systems.
Read more about this topic: MPEG-4 Part 3
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