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// Copyright 2020 Google LLC
// SPDX-License-Identifier: BSD-2-Clause
#include "avif/internal.h"
#include "gav1/decoder.h"
#include <string.h>
struct avifCodecInternal
{
Libgav1DecoderSettings gav1Settings;
Libgav1Decoder * gav1Decoder;
const Libgav1DecoderBuffer * gav1Image;
avifRange colorRange;
};
static void gav1CodecDestroyInternal(avifCodec * codec)
{
if (codec->internal->gav1Decoder != NULL) {
Libgav1DecoderDestroy(codec->internal->gav1Decoder);
}
avifFree(codec->internal);
}
static avifBool gav1CodecGetNextImage(struct avifCodec * codec,
const avifDecodeSample * sample,
avifBool alpha,
avifBool * isLimitedRangeAlpha,
avifImage * image)
{
if (codec->internal->gav1Decoder == NULL) {
codec->internal->gav1Settings.threads = codec->maxThreads;
codec->internal->gav1Settings.operating_point = codec->operatingPoint;
codec->internal->gav1Settings.output_all_layers = codec->allLayers;
if (Libgav1DecoderCreate(&codec->internal->gav1Settings, &codec->internal->gav1Decoder) != kLibgav1StatusOk) {
return AVIF_FALSE;
}
}
if (Libgav1DecoderEnqueueFrame(codec->internal->gav1Decoder,
sample->data.data,
sample->data.size,
/*user_private_data=*/0,
/*buffer_private_data=*/NULL) != kLibgav1StatusOk) {
return AVIF_FALSE;
}
// Each Libgav1DecoderDequeueFrame() call invalidates the output frame
// returned by the previous Libgav1DecoderDequeueFrame() call. Clear
// our pointer to the previous output frame.
codec->internal->gav1Image = NULL;
const Libgav1DecoderBuffer * nextFrame = NULL;
for (;;) {
if (Libgav1DecoderDequeueFrame(codec->internal->gav1Decoder, &nextFrame) != kLibgav1StatusOk) {
return AVIF_FALSE;
}
if (nextFrame && (sample->spatialID != AVIF_SPATIAL_ID_UNSET) && (nextFrame->spatial_id != sample->spatialID)) {
nextFrame = NULL;
} else {
break;
}
}
// Got an image!
if (nextFrame) {
codec->internal->gav1Image = nextFrame;
codec->internal->colorRange = (nextFrame->color_range == kLibgav1ColorRangeStudio) ? AVIF_RANGE_LIMITED : AVIF_RANGE_FULL;
} else {
if (alpha && codec->internal->gav1Image) {
// Special case: reuse last alpha frame
} else {
return AVIF_FALSE;
}
}
const Libgav1DecoderBuffer * gav1Image = codec->internal->gav1Image;
avifBool isColor = !alpha;
if (isColor) {
// Color (YUV) planes - set image to correct size / format, fill color
avifPixelFormat yuvFormat = AVIF_PIXEL_FORMAT_NONE;
switch (gav1Image->image_format) {
case kLibgav1ImageFormatMonochrome400:
yuvFormat = AVIF_PIXEL_FORMAT_YUV400;
break;
case kLibgav1ImageFormatYuv420:
yuvFormat = AVIF_PIXEL_FORMAT_YUV420;
break;
case kLibgav1ImageFormatYuv422:
yuvFormat = AVIF_PIXEL_FORMAT_YUV422;
break;
case kLibgav1ImageFormatYuv444:
yuvFormat = AVIF_PIXEL_FORMAT_YUV444;
break;
}
if (image->width && image->height) {
if ((image->width != (uint32_t)gav1Image->displayed_width[0]) ||
(image->height != (uint32_t)gav1Image->displayed_height[0]) || (image->depth != (uint32_t)gav1Image->bitdepth) ||
(image->yuvFormat != yuvFormat)) {
// Throw it all out
avifImageFreePlanes(image, AVIF_PLANES_ALL);
}
}
image->width = gav1Image->displayed_width[0];
image->height = gav1Image->displayed_height[0];
image->depth = gav1Image->bitdepth;
image->yuvFormat = yuvFormat;
image->yuvRange = codec->internal->colorRange;
image->yuvChromaSamplePosition = (avifChromaSamplePosition)gav1Image->chroma_sample_position;
image->colorPrimaries = (avifColorPrimaries)gav1Image->color_primary;
image->transferCharacteristics = (avifTransferCharacteristics)gav1Image->transfer_characteristics;
image->matrixCoefficients = (avifMatrixCoefficients)gav1Image->matrix_coefficients;
// Steal the pointers from the decoder's image directly
avifImageFreePlanes(image, AVIF_PLANES_YUV);
int yuvPlaneCount = (yuvFormat == AVIF_PIXEL_FORMAT_YUV400) ? 1 : 3;
for (int yuvPlane = 0; yuvPlane < yuvPlaneCount; ++yuvPlane) {
image->yuvPlanes[yuvPlane] = gav1Image->plane[yuvPlane];
image->yuvRowBytes[yuvPlane] = gav1Image->stride[yuvPlane];
}
image->imageOwnsYUVPlanes = AVIF_FALSE;
} else {
// Alpha plane - ensure image is correct size, fill color
if (image->width && image->height) {
if ((image->width != (uint32_t)gav1Image->displayed_width[0]) ||
(image->height != (uint32_t)gav1Image->displayed_height[0]) || (image->depth != (uint32_t)gav1Image->bitdepth)) {
// Alpha plane doesn't match previous alpha plane decode, bail out
return AVIF_FALSE;
}
}
image->width = gav1Image->displayed_width[0];
image->height = gav1Image->displayed_height[0];
image->depth = gav1Image->bitdepth;
avifImageFreePlanes(image, AVIF_PLANES_A);
image->alphaPlane = gav1Image->plane[0];
image->alphaRowBytes = gav1Image->stride[0];
*isLimitedRangeAlpha = (codec->internal->colorRange == AVIF_RANGE_LIMITED);
image->imageOwnsAlphaPlane = AVIF_FALSE;
}
return AVIF_TRUE;
}
const char * avifCodecVersionGav1(void)
{
return Libgav1GetVersionString();
}
avifCodec * avifCodecCreateGav1(void)
{
avifCodec * codec = (avifCodec *)avifAlloc(sizeof(avifCodec));
if (codec == NULL) {
return NULL;
}
memset(codec, 0, sizeof(struct avifCodec));
codec->getNextImage = gav1CodecGetNextImage;
codec->destroyInternal = gav1CodecDestroyInternal;
codec->internal = (struct avifCodecInternal *)avifAlloc(sizeof(struct avifCodecInternal));
if (codec->internal == NULL) {
avifFree(codec);
return NULL;
}
memset(codec->internal, 0, sizeof(struct avifCodecInternal));
Libgav1DecoderSettingsInitDefault(&codec->internal->gav1Settings);
return codec;
}
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