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Handle chroma co-siting in the Metal shaders

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This commit is contained in:
Cameron Gutman
2025-11-01 21:57:13 -05:00
parent 2c12ad297f
commit 9b3050514b
2 changed files with 47 additions and 3 deletions
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app/streaming/video/ffmpeg-renderers/vt_metal.mm
+37
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@@ -31,6 +31,7 @@ struct CscParams
struct ParamBuffer
{
CscParams cscParams;
vector_float2 chromaOffset;
float bitnessScaleFactor;
};
@@ -313,6 +314,40 @@ public:
paramBuffer.cscParams.matrix[i][2] *= uvScale;
}
switch (frame->chroma_location) {
default:
case AVCHROMA_LOC_LEFT:
paramBuffer.chromaOffset[0] = 0;
paramBuffer.chromaOffset[1] = 0.5;
break;
case AVCHROMA_LOC_CENTER:
paramBuffer.chromaOffset[0] = 0.5;
paramBuffer.chromaOffset[1] = 0.5;
break;
case AVCHROMA_LOC_TOPLEFT:
paramBuffer.chromaOffset[0] = 0;
paramBuffer.chromaOffset[1] = 0;
break;
case AVCHROMA_LOC_TOP:
paramBuffer.chromaOffset[0] = 0.5;
paramBuffer.chromaOffset[1] = 0;
break;
case AVCHROMA_LOC_BOTTOMLEFT:
paramBuffer.chromaOffset[0] = 0;
paramBuffer.chromaOffset[1] = 1.0;
break;
case AVCHROMA_LOC_BOTTOM:
paramBuffer.chromaOffset[0] = 0.5;
paramBuffer.chromaOffset[1] = 1.0;
break;
}
if (m_VideoFormat & VIDEO_FORMAT_MASK_YUV444) {
// 4:4:4 has no subsampling
paramBuffer.chromaOffset[0] = 0;
paramBuffer.chromaOffset[1] = 0;
}
// Set the EDR metadata for HDR10 to enable OS tonemapping
if (frame->color_trc == AVCOL_TRC_SMPTE2084 && m_MasteringDisplayColorVolume != nullptr) {
m_MetalLayer.EDRMetadata = [CAEDRMetadata HDR10MetadataWithDisplayInfo:(__bridge NSData*)m_MasteringDisplayColorVolume
@@ -676,6 +711,7 @@ public:
m_Window = params->window;
m_FrameRateRange = CAFrameRateRangeMake(params->frameRate, params->frameRate, params->frameRate);
m_VideoFormat = params->videoFormat;
id<MTLDevice> device = getMetalDevice();
if (!device) {
@@ -972,6 +1008,7 @@ private:
id<MTLCommandQueue> m_CommandQueue;
id<MTLTexture> m_SwMappingTextures[MAX_VIDEO_PLANES];
SDL_MetalView m_MetalView;
int m_VideoFormat;
int m_LastColorSpace;
bool m_LastFullRange;
int m_LastFrameWidth;