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TAV: no delta coding by default (but allows skip coding)

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minjaesong
2025-10-14 14:16:05 +09:00
parent 871d7bcdfe
commit 5dcf2177d5
3 changed files with 17 additions and 4 deletions
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21
video_encoder/encoder_tav.c
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@@ -283,6 +283,7 @@ typedef struct tav_encoder_s {
int channel_layout; // Channel layout: 0=Y-Co-Cg, 1=Y-only, 2=Y-Co-Cg-A, 3=Y-A, 4=Co-Cg
int progressive_mode; // 0 = interlaced (default), 1 = progressive
int grain_synthesis; // 1 = enable grain synthesis (default), 0 = disable
int use_delta_encoding;
// Frame buffers - ping-pong implementation
uint8_t *frame_rgb[2]; // [0] and [1] alternate between current and previous
@@ -663,7 +664,8 @@ static void show_usage(const char *program_name) {
printf(" -v, --verbose Verbose output\n");
printf(" -t, --test Test mode: generate solid colour frames\n");
printf(" --lossless Lossless mode (-q %d -Q1,1,1 -w 0 --intra-only --no-perceptual-tuning --no-dead-zone --arate 384)\n", qtsize);
printf(" --intra-only Disable delta encoding\n");
printf(" --intra-only Disable delta and skip encoding\n");
printf(" --enable-delta Enable delta encoding\n");
printf(" --ictcp Use ICtCp colour space instead of YCoCg-R (use when source is in BT.2100)\n");
printf(" --no-perceptual-tuning Disable perceptual quantisation\n");
printf(" --no-dead-zone Disable dead-zone quantisation (for comparison/testing)\n");
@@ -736,6 +738,7 @@ static tav_encoder_t* create_encoder(void) {
enc->zstd_level = DEFAULT_ZSTD_LEVEL; // Default Zstd compression level
enc->progressive_mode = 1; // Default to progressive mode
enc->grain_synthesis = 0; // Default: disable grain synthesis (only do it on the decoder)
enc->use_delta_encoding = 0; // disable by default: no longer brings size benefit
return enc;
}
@@ -2010,9 +2013,13 @@ static size_t compress_and_write_frame(tav_encoder_t *enc, uint8_t packet_type)
if (enc->verbose && tile_x == 0 && tile_y == 0) {
printf(" → Using SKIP mode (copying from reference I-frame)\n");
}
} else {
} else if (enc->use_delta_encoding) {
mode = TAV_MODE_DELTA; // P-frames use coefficient delta encoding
count_delta++;
} else {
// Delta encoding disabled: use INTRA mode (packet_type is already I-frame from main loop)
mode = TAV_MODE_INTRA;
count_intra++;
}
// Determine tile data size and allocate buffers
@@ -3756,6 +3763,7 @@ int main(int argc, char *argv[]) {
{"interlace", no_argument, 0, 1015},
{"interlaced", no_argument, 0, 1015},
// {"no-grain-synthesis", no_argument, 0, 1016},
{"enable-delta", no_argument, 0, 1017},
{"help", no_argument, 0, '?'},
{0, 0, 0, 0}
};
@@ -3908,6 +3916,9 @@ int main(int argc, char *argv[]) {
case 1016: // --no-grain-synthesis
enc->grain_synthesis = 0;
break;
case 1017: // --enable-delta
enc->use_delta_encoding = 1;
break;
case 'a':
int bitrate = atoi(optarg);
int valid_bitrate = validate_mp2_bitrate(bitrate);
@@ -4202,10 +4213,12 @@ int main(int argc, char *argv[]) {
// Un-skip threshold is the negation of SKIP threshold: content must change to break the run
int suppress_keyframe_timer = in_skip_run && is_still;
// Keyframe decision: intra-only mode, time-based (unless suppressed by SKIP run), or scene change
// Keyframe decision: intra-only mode, time-based (unless suppressed by SKIP run), scene change,
// or when delta encoding is disabled and skip mode cannot be used (pure INTRA frames)
int is_keyframe = enc->intra_only ||
(is_time_keyframe && !suppress_keyframe_timer) ||
is_scene_change;
is_scene_change ||
(!enc->use_delta_encoding && !can_use_skip);
// Track if we'll use SKIP mode this frame (continues the SKIP run)
enc->used_skip_mode_last_frame = can_use_skip && !is_keyframe;