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TAV: channel-concatenated coeffs preprocessing

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minjaesong
2025-09-29 14:42:52 +09:00
parent 5012ca4085
commit 1d3d218238
5 changed files with 339 additions and 81 deletions
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64
video_encoder/encoder_tav.c
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@@ -990,6 +990,57 @@ static size_t preprocess_coefficients(int16_t *coeffs, int coeff_count, uint8_t
return map_bytes + (nonzero_count * sizeof(int16_t));
}
// Preprocess coefficients using concatenated significance maps for optimal cross-channel compression
static size_t preprocess_coefficients_concatenated(int16_t *coeffs_y, int16_t *coeffs_co, int16_t *coeffs_cg,
int coeff_count, uint8_t *output_buffer) {
int map_bytes = (coeff_count + 7) / 8;
// Count non-zeros per channel
int nonzero_y = 0, nonzero_co = 0, nonzero_cg = 0;
for (int i = 0; i < coeff_count; i++) {
if (coeffs_y[i] != 0) nonzero_y++;
if (coeffs_co[i] != 0) nonzero_co++;
if (coeffs_cg[i] != 0) nonzero_cg++;
}
// Layout: [Y_map][Co_map][Cg_map][Y_vals][Co_vals][Cg_vals]
uint8_t *y_map = output_buffer;
uint8_t *co_map = output_buffer + map_bytes;
uint8_t *cg_map = output_buffer + map_bytes * 2;
int16_t *y_values = (int16_t *)(output_buffer + map_bytes * 3);
int16_t *co_values = y_values + nonzero_y;
int16_t *cg_values = co_values + nonzero_co;
// Clear significance maps
memset(y_map, 0, map_bytes);
memset(co_map, 0, map_bytes);
memset(cg_map, 0, map_bytes);
// Fill significance maps and extract values
int y_idx = 0, co_idx = 0, cg_idx = 0;
for (int i = 0; i < coeff_count; i++) {
int byte_idx = i / 8;
int bit_idx = i % 8;
if (coeffs_y[i] != 0) {
y_map[byte_idx] |= (1 << bit_idx);
y_values[y_idx++] = coeffs_y[i];
}
if (coeffs_co[i] != 0) {
co_map[byte_idx] |= (1 << bit_idx);
co_values[co_idx++] = coeffs_co[i];
}
if (coeffs_cg[i] != 0) {
cg_map[byte_idx] |= (1 << bit_idx);
cg_values[cg_idx++] = coeffs_cg[i];
}
}
return map_bytes * 3 + (nonzero_y + nonzero_co + nonzero_cg) * sizeof(int16_t);
}
// Quantisation for DWT subbands with rate control
static void quantise_dwt_coefficients(float *coeffs, int16_t *quantised, int size, int quantiser) {
float effective_q = quantiser;
@@ -1311,15 +1362,10 @@ static size_t serialise_tile_data(tav_encoder_t *enc, int tile_x, int tile_y,
printf("\n");
}*/
// Preprocess and write quantised coefficients using significance mapping for better compression
size_t y_compressed_size = preprocess_coefficients(quantised_y, tile_size, buffer + offset);
offset += y_compressed_size;
size_t co_compressed_size = preprocess_coefficients(quantised_co, tile_size, buffer + offset);
offset += co_compressed_size;
size_t cg_compressed_size = preprocess_coefficients(quantised_cg, tile_size, buffer + offset);
offset += cg_compressed_size;
// Preprocess and write quantised coefficients using concatenated significance maps for optimal compression
size_t total_compressed_size = preprocess_coefficients_concatenated(quantised_y, quantised_co, quantised_cg,
tile_size, buffer + offset);
offset += total_compressed_size;
// DEBUG: Dump raw DWT coefficients for frame ~60 when it's an intra-frame
if (!debugDumpMade && enc->frame_count >= makeDebugDump - 1 && enc->frame_count <= makeDebugDump + 2 &&