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Create a basic AV1 extension dictionary

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We may also need the AV1CodecConfigurationBox though.
This commit is contained in:
Cameron Gutman 2023-10-20 17:11:02 -05:00
parent 628252ed28
commit 0a59ce0ca9
1 changed files with 52 additions and 2 deletions
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54
Limelight/Stream/VideoDecoderRenderer.m
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@ -174,6 +174,53 @@ int DrSubmitDecodeUnit(PDECODE_UNIT decodeUnit);
}
}
// Much of this logic comes from Chrome
- (NSDictionary*)createAV1FormatExtensionsDictionaryForDU:(PDECODE_UNIT)du {
NSMutableDictionary* extensions = [[NSMutableDictionary alloc] init];
extensions[(__bridge NSString*)kCMFormatDescriptionExtension_FormatName] = @"av01";
// We use the value for YUV without alpha, same as Chrome
// https://developer.apple.com/library/archive/qa/qa1183/_index.html
extensions[(__bridge NSString*)kCMFormatDescriptionExtension_Depth] = @24;
switch (du->colorspace) {
default:
case COLORSPACE_REC_601:
extensions[(__bridge NSString*)kCMFormatDescriptionExtension_ColorPrimaries] = (__bridge NSString*)kCMFormatDescriptionColorPrimaries_SMPTE_C;
extensions[(__bridge NSString*)kCMFormatDescriptionExtension_TransferFunction] = (__bridge NSString*)kCMFormatDescriptionTransferFunction_ITU_R_709_2;
extensions[(__bridge NSString*)kCMFormatDescriptionExtension_YCbCrMatrix] = (__bridge NSString*)kCMFormatDescriptionYCbCrMatrix_ITU_R_601_4;
break;
case COLORSPACE_REC_709:
extensions[(__bridge NSString*)kCMFormatDescriptionExtension_ColorPrimaries] = (__bridge NSString*)kCMFormatDescriptionColorPrimaries_ITU_R_709_2;
extensions[(__bridge NSString*)kCMFormatDescriptionExtension_TransferFunction] = (__bridge NSString*)kCMFormatDescriptionTransferFunction_ITU_R_709_2;
extensions[(__bridge NSString*)kCMFormatDescriptionExtension_YCbCrMatrix] = (__bridge NSString*)kCMFormatDescriptionTransferFunction_ITU_R_709_2;
break;
case COLORSPACE_REC_2020:
extensions[(__bridge NSString*)kCMFormatDescriptionExtension_ColorPrimaries] = (__bridge NSString*)kCMFormatDescriptionColorPrimaries_ITU_R_2020;
extensions[(__bridge NSString*)kCMFormatDescriptionExtension_YCbCrMatrix] = (__bridge NSString*)kCMFormatDescriptionYCbCrMatrix_ITU_R_2020;
if (du->hdrActive) {
extensions[(__bridge NSString*)kCMFormatDescriptionExtension_TransferFunction] = (__bridge NSString*)kCMFormatDescriptionTransferFunction_SMPTE_ST_2084_PQ;
}
else {
extensions[(__bridge NSString*)kCMFormatDescriptionExtension_TransferFunction] = (__bridge NSString*)kCMFormatDescriptionTransferFunction_ITU_R_2020;
}
break;
}
extensions[(__bridge NSString*)kCMFormatDescriptionExtension_FullRangeVideo] = @(NO);
if (contentLightLevelInfo) {
extensions[(__bridge NSString*)kCMFormatDescriptionExtension_ContentLightLevelInfo] = contentLightLevelInfo;
}
if (masteringDisplayColorVolume) {
extensions[(__bridge NSString*)kCMFormatDescriptionExtension_MasteringDisplayColorVolume] = masteringDisplayColorVolume;
}
return extensions;
}
// This function must free data for bufferType == BUFFER_TYPE_PICDATA
- (int)submitDecodeBuffer:(unsigned char *)data length:(int)length bufferType:(int)bufferType decodeUnit:(PDECODE_UNIT)du
{
@ -267,8 +314,11 @@ int DrSubmitDecodeUnit(PDECODE_UNIT decodeUnit);
#if defined(__IPHONE_16_0) || defined(__TVOS_16_0)
else if (videoFormat & VIDEO_FORMAT_MASK_AV1) {
// AV1 doesn't have a special format description function like H.264 and HEVC have, so we just use the generic one
// TODO: Is this correct?
status = CMVideoFormatDescriptionCreate(kCFAllocatorDefault, kCMVideoCodecType_AV1, videoWidth, videoHeight, nil, &formatDesc);
NSDictionary* extensions = [self createAV1FormatExtensionsDictionaryForDU:du];
status = CMVideoFormatDescriptionCreate(kCFAllocatorDefault, kCMVideoCodecType_AV1,
videoWidth, videoHeight,
(__bridge CFDictionaryRef)extensions,
&formatDesc);
if (status != noErr) {
Log(LOG_E, @"Failed to create AV1 format description: %d", (int)status);
formatDesc = NULL;