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Expose some options for AVIF

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This commit is contained in:
Surma
2020-02-06 09:21:43 -08:00
committed by Ingvar Stepanyan
parent c29006d593
commit ac9a7767d2
8 changed files with 114 additions and 18 deletions
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53
codecs/avif_enc/avif_enc.cpp
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@@ -4,10 +4,41 @@
using namespace emscripten;
struct AvifOptions {
// [0 - 63]
// 0 = lossless
// 63 = worst quality
int minQuantizer;
int maxQuantizer;
// [0 - 6]
// Creates 2^n tiles in that dimension
int tileRowsLog2;
int tileColsLog2;
// [0 - 10]
// 0 = slowest
// 10 = fastest
int speed;
// 0 = 4:2:0
// 1 = 4:2:2
// 2 = 4:4:4
int subsample;
};
avifRWData output = AVIF_DATA_EMPTY;
val encode(std::string buffer, int width, int height) {
val encode(std::string buffer, int width, int height, AvifOptions options) {
int depth = 8;
avifPixelFormat format = AVIF_PIXEL_FORMAT_YUV420;
avifPixelFormat format;
switch (options.subsample) {
case 0:
format = AVIF_PIXEL_FORMAT_YUV420;
break;
case 1:
format = AVIF_PIXEL_FORMAT_YUV422;
break;
case 2:
format = AVIF_PIXEL_FORMAT_YUV444;
break;
}
avifImage *image = avifImageCreate(width, height, depth, format);
uint8_t *rgba = (uint8_t *)buffer.c_str();
@@ -27,15 +58,15 @@ val encode(std::string buffer, int width, int height) {
avifEncoder *encoder = avifEncoderCreate();
encoder->maxThreads = 1;
encoder->minQuantizer = AVIF_QUANTIZER_LOSSLESS;
encoder->maxQuantizer = AVIF_QUANTIZER_LOSSLESS;
encoder->minQuantizer = options.minQuantizer;
encoder->maxQuantizer = options.maxQuantizer;
encoder->tileRowsLog2 = options.tileRowsLog2;
encoder->tileColsLog2 = options.tileColsLog2;
encoder->speed = options.speed;
avifResult encodeResult = avifEncoderWrite(encoder, image, &output);
if (encodeResult != AVIF_RESULT_OK) {
return val::null();
}
// output contains a valid .avif file's contents
// ... output.data;
// ... output.size;
avifImageDestroy(image);
avifEncoderDestroy(encoder);
return val(typed_memory_view(output.size, output.data));
@@ -44,6 +75,14 @@ val encode(std::string buffer, int width, int height) {
void free_result() { avifRWDataFree(&output); }
EMSCRIPTEN_BINDINGS(my_module) {
value_object<AvifOptions>("AvifOptions")
.field("minQuantizer", &AvifOptions::minQuantizer)
.field("maxQuantizer", &AvifOptions::maxQuantizer)
.field("tileRowsLog2", &AvifOptions::tileRowsLog2)
.field("tileColsLog2", &AvifOptions::tileColsLog2)
.field("speed", &AvifOptions::speed)
.field("subsample", &AvifOptions::subsample);
function("encode", &encode);
function("free_result", &free_result);
}