Indeo Audio: Difference between revisions
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* Samples: http://samples.mplayerhq.hu/A-codecs/Indeo_audio/ | * Samples: http://samples.mplayerhq.hu/A-codecs/Indeo_audio/ | ||
This is the next version of [[Intel Music Coder]] with slightly different coding parameters | |||
(all algorithms are the same) and joint stereo mode. | |||
=== Header format === | === Header format === | ||
Line 36: | Line 37: | ||
2nd coefficient - 7 bits | 2nd coefficient - 7 bits | ||
others - 4 bits per coefficient | others - 4 bits per coefficient | ||
Level reconstruction is also the same as in [[Intel Music Coder]] except for raw form. | |||
[[Category:Audio Codecs]] | [[Category:Audio Codecs]] | ||
[[Category: | [[Category:Incomplete Audio Codecs]] |
Revision as of 08:03, 9 June 2012
- Format: 0x402
- Company: Intel, now Ligos
- Samples: http://samples.mplayerhq.hu/A-codecs/Indeo_audio/
This is the next version of Intel Music Coder with slightly different coding parameters (all algorithms are the same) and joint stereo mode.
Header format
bit 0 - should be zero bit 1 - should be zero bit 2 - stereo flag bits 3-8 - block size code bit 9 - codebook set selector (0 - no escapes, 1 - with escapes) bit 10 - codebook selector bit 11 - use raw coding bit 12 - SNR offset (-30 or -10)
Block size code:
0, 34-50 - (block_size + 14) 16-bit words 33 - 32 words 1-32 - (block_size + 15) words 51-63 - invalid value
Levels
There are 32 levels, coded with either one of codebooks or in raw form.
Decoding Huffman-coded levels is the same as in Intel Music Coder but with different tables.
Raw form:
1st coefficient - 5 bits 2nd coefficient - 7 bits others - 4 bits per coefficient
Level reconstruction is also the same as in Intel Music Coder except for raw form.