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tavenc: extended header, automatic multithreading, tad autoselect fix

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minjaesong
2025-12-09 03:44:35 +09:00
parent c6c50c2ebe
commit 621c312922
4 changed files with 280 additions and 72 deletions
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30
terranmon.txt
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@@ -1644,43 +1644,43 @@ start of the next packet
int16 Reserved (zero-fill)
uint32 Total packet size past 16-byte header
uint32 CRC-32 of 12-byte header
<packet header end; encoded with rate 1/2 LPDC>
<packet header end; encoded with rate 1/2 LDPC>
uint64 Timecode in nanoseconds (repeated thrice; bitwise majority)
* TAD with LPDC (0x50)
* TAD with LDPC (0x50)
uint8 Packet type (0x50)
<TAD header start>
uint16 Sample Count
uint32 Compressed Size + 14
<TAD header end; encoded with rate 1/2 LPDC>
<TAD header end; encoded with rate 1/2 LDPC>
<TAD chunk header start>
uint16 Sample Count
uint8 Quantiser Bits
uint32 Compressed Size
<TAD chunk header end; encoded with rate 1/2 LPDC>
<LPDC header start>
<TAD chunk header end; encoded with rate 1/2 LDPC>
<LDPC header start>
uint8 FEC Code ID
uint16 FEC Block size or codebook ID
uint16 FEC parity length
<LPDC header end; encoded with rate 1/2 LPDC>
<Reed-Solomon block start>
<LDPC header end; encoded with rate 1/2 LDPC>
<Reed-Solomon (255,223) block start>
* Zstd-compressed TAD
* Parity for Zstd-compressed TAD
<Reed-Solomon block end>
* TAV with LPDC (0x51)
<Reed-Solomon (255,223) block end>
* TAV with LDPC (0x51)
uint8 Packet type (0x51)
<TAV header start>
uint8 GOP Size (number of frames in this GOP)
uint32 Compressed Size
<TAV header end; encoded with rate 1/2 LPDC>
<LPDC header start>
<TAV header end; encoded with rate 1/2 LDPC>
<LDPC header start>
uint8 FEC Code ID
uint16 FEC Block size or codebook ID
uint16 FEC parity length
<LPDC header end; encoded with rate 1/2 LPDC>
<Reed-Solomon block start>
<LDPC header end; encoded with rate 1/2 LDPC>
<Reed-Solomon (255,223) block start>
* Zstd-compressed Unified Block Data
* Parity for Zstd-compressed Unified Block Data
<Reed-Solomon block end>
<Reed-Solomon (255,223) block end>
# How to sync to the stream
1. Find a sync pattern
@@ -1690,6 +1690,8 @@ start of the next packet
5. Check calculated CRC against stored CRC
6. If they match, sync to the stream; if not, find a next sync pattern
The decoder "may" try to sync to the sync pattern that appears damaged when its contents are seem to be intact.
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TSVM Advanced Audio (TAD) Format