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tavenc: multithreaded decoding

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minjaesong
2025-12-08 16:07:20 +09:00
parent 34a1f0e3db
commit c6c50c2ebe
5 changed files with 919 additions and 42 deletions
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terranmon.txt
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@@ -988,10 +988,11 @@ transmission capability, and region-of-interest coding.
The encoder supports following presets:
- Sports: use finer temporal quantisation, resulting in better-preserved motion. Less effective as resolution goes up
- Anime: instructs the decoder to disable grain synthensis
2025-12-08 Addendum: TAV-DT should be its own encoder, not preset
- D1/D1PAL: encode to TAV-DT (NTSC/PAL) format. Any non-compliant setup will be ignored and substituted to compliant values
- D1P/D1PALP: encode to TAV-DT Progressive (NTSC/PAL) format. Any non-compliant setup will be ignored and substituted to compliant values
## Packet Structure (some special packets have no payload. See Packet Types for details)
uint8 Packet Type
uint32 Payload Size
@@ -1021,6 +1022,9 @@ The encoder supports following presets:
0x42: Zstd-compressed 16-bit PCM (32 KHz, little endian)
0x43: Zstd-compressed ADPCM (32 KHz)
0x44: TAD (TSVM Advanced Audio)
<TAV-DT specific>
0x50: TAV-DT audio packet with forward error correction
0x51: TAV-DT video packet with forward error correction
<multiplexed video>
0x70..7F: Reserved for Future Version
<Standard metadata payloads>
@@ -1626,22 +1630,57 @@ start of the next packet
- Entropy coder: EZBC
- Encoder preset: sports preset always enabled
- Tiles: monoblock
- GOP size: always 16 frames
# Packet Structure
uint32 Sync pattern (0xE3537A1F for NTSC Dimension, 0xD193A745 for PAL Dimension)
uint8 Framerate
uint8 Flags
- bit 0 = interlaced
- bit 1 = is NTSC framerate
- bit 4-7 = quality index (0-5)
* Quality indices follow TSVM encoder's
int16 Reserved (zero-fill)
uint32 Total packet size past 16-byte header, modulo 2^32
!! this value should NOT be used to derive the actual packet size !!
uint32 CRC-32 of 12-byte header
uint64 Timecode (0xFD packet) without header byte
* TAD packet (full 0x24 packet)
* TAV packet (full 0x10 or 0x12 packet)
<packet header start>
uint8 Framerate
uint8 Flags
- bit 0 = interlaced
- bit 1 = is NTSC framerate
- bit 4-7 = quality index (0-5)
* Quality indices follow TSVM encoder's
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>
uint64 Timecode in nanoseconds (repeated thrice; bitwise majority)
* TAD with LPDC (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 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>
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>
* Zstd-compressed TAD
* Parity for Zstd-compressed TAD
<Reed-Solomon block end>
* TAV with LPDC (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>
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>
* Zstd-compressed Unified Block Data
* Parity for Zstd-compressed Unified Block Data
<Reed-Solomon block end>
# How to sync to the stream
1. Find a sync pattern
@@ -1651,7 +1690,6 @@ 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
--------------------------------------------------------------------------------
TSVM Advanced Audio (TAD) Format