Basic av1C support (rough, still needs work)
diff --git a/src/write.c b/src/write.c
index 510e169..16d20dc 100644
--- a/src/write.c
+++ b/src/write.c
@@ -21,6 +21,7 @@
static const size_t alphaURNSize = sizeof(alphaURN);
static avifBool avifImageIsOpaque(avifImage * image);
+static void writeConfigBox(avifStream * s, avifCodecConfigurationBox * cfg);
avifResult avifImageWrite(avifImage * image, avifRawData * output, int quality)
{
@@ -227,6 +228,12 @@
++ipcoIndex;
ipmaPush(&ipmaColor, ipcoIndex);
+ avifCodecConfigurationBox colorConfig;
+ avifCodecGetConfigurationBox(codec, AVIF_CODEC_PLANES_COLOR, &colorConfig);
+ writeConfigBox(&s, &colorConfig);
+ ++ipcoIndex;
+ ipmaPush(&ipmaColor, ipcoIndex);
+
if (hasAlpha) {
avifBoxMarker pixiA = avifStreamWriteBox(&s, "pixi", 0, 0);
avifStreamWriteU8(&s, 1); // unsigned int (8) num_channels;
@@ -235,6 +242,12 @@
++ipcoIndex;
ipmaPush(&ipmaAlpha, ipcoIndex);
+ avifCodecConfigurationBox alphaConfig;
+ avifCodecGetConfigurationBox(codec, AVIF_CODEC_PLANES_ALPHA, &alphaConfig);
+ writeConfigBox(&s, &alphaConfig);
+ ++ipcoIndex;
+ ipmaPush(&ipmaAlpha, ipcoIndex);
+
avifBoxMarker auxC = avifStreamWriteBox(&s, "auxC", 0, 0);
avifStreamWriteChars(&s, alphaURN, alphaURNSize); // string aux_type;
avifStreamFinishBox(&s, auxC);
@@ -313,3 +326,37 @@
}
return AVIF_TRUE;
}
+
+static void writeConfigBox(avifStream * s, avifCodecConfigurationBox * cfg)
+{
+ avifBoxMarker av1C = avifStreamWriteBox(s, "av1C", 0, 0);
+
+ // unsigned int (1) marker = 1;
+ // unsigned int (7) version = 1;
+ avifStreamWriteU8(s, 0x80 | 0x1);
+
+ // unsigned int (3) seq_profile;
+ // unsigned int (5) seq_level_idx_0;
+ avifStreamWriteU8(s, ((cfg->seqProfile & 0x7) << 5) | (cfg->seqLevelIdx0 & 0x1f));
+
+ uint8_t bits = 0;
+ bits |= (cfg->seqTier0 & 0x1) << 7; // unsigned int (1) seq_tier_0;
+ bits |= (cfg->highBitdepth & 0x1) << 6; // unsigned int (1) high_bitdepth;
+ bits |= (cfg->twelveBit & 0x1) << 5; // unsigned int (1) twelve_bit;
+ bits |= (cfg->monochrome & 0x1) << 4; // unsigned int (1) monochrome;
+ bits |= (cfg->chromaSubsamplingX & 0x1) << 3; // unsigned int (1) chroma_subsampling_x;
+ bits |= (cfg->chromaSubsamplingY & 0x1) << 2; // unsigned int (1) chroma_subsampling_y;
+ bits |= (cfg->chromaSamplePosition & 0x3); // unsigned int (2) chroma_sample_position;
+ avifStreamWriteU8(s, bits);
+
+ // unsigned int (3) reserved = 0;
+ // unsigned int (1) initial_presentation_delay_present;
+ // if (initial_presentation_delay_present) {
+ // unsigned int (4) initial_presentation_delay_minus_one;
+ // } else {
+ // unsigned int (4) reserved = 0;
+ // }
+ avifStreamWriteU8(s, 0);
+
+ avifStreamFinishBox(s, av1C);
+}
