L64105 LSI Logic Corporation, L64105 Datasheet - Page 404

• Manufacturer Part Number: L64105
• Description: Mpeg-2 Audio/video Decoder
• Manufacturer: LSI Logic Corporation

A.2.1.1 Audio Packet Header
A.2.1.2 Audio Frame
A-10
An audio packet header contains the following:
An audio frame contains a slice of the audio data stream together with
some supplementary data. Audio frames have the following elements:
Video/Audio Compression and Decompression Concepts
Packet Start Code
Identifies a packet as an audio packet. The Packet Start Code also
contains a five-bit audio stream identifier that lets the L64105 identify
the audio channel.
Packet Length
Indicates the number of bytes remaining in the audio packet.
Presentation Time Stamps (PTS)
The PTS indicates when audio data should be presented.
Audio Frame Header
Data in the audio frame header set the parameters that describe the
format and mode of the audio data.
Audio Frame Cyclic Redundancy Code (CRC)
This field contains a 16-bit checksum, which can be used to detect
errors in the audio frame header.
Audio Data
The decoder uses the audio data to reconstruct the sampled audio
data. Its format is beyond the scope of this document. The data
structures for Layer I dual channel/stereo, intensity stereo, and for
the more complex Layer II audio data fields are described in
Sections 2.4.1.5 and 2.4.1.6 of the ISO/IEC 11172-3 .
Ancillary Data
The final field in an audio frame containing user-defined data
(ancillary data) is discarded by the L64105.