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Add fix that strips unexpected padding for NV12 frames (#556)

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sean yu
2024-03-01 17:23:05 +00:00
committed by GitHub
parent 2bc011f39f
commit a9046e6ac1
1 changed files with 44 additions and 9 deletions
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pkg/avfoundation/AVFoundationBind/AVFoundationBind.m
+44 -9
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@@ -76,26 +76,61 @@ didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
if (CMSampleBufferGetNumSamples(sampleBuffer) != 1 ||
!CMSampleBufferIsValid(sampleBuffer) ||
!CMSampleBufferDataIsReady(sampleBuffer)) {
return;
return;
}
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
if (imageBuffer == NULL) {
return;
return;
}
imageBuffer = CVBufferRetain(imageBuffer);
CVBufferRetain(imageBuffer);
CVReturn ret =
CVPixelBufferLockBaseAddress(imageBuffer, kCVPixelBufferLock_ReadOnly);
if (ret != kCVReturnSuccess) {
return;
CVBufferRelease(imageBuffer);
return;
}
// Handle NV12 special case
OSType pixelFormat = CVPixelBufferGetPixelFormatType(imageBuffer);
if (pixelFormat == kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange) {
// Get actual dimensions of image (without padding)
size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t height = CVPixelBufferGetHeight(imageBuffer);
size_t totalSize = /*Y plane*/ width * height + /*UV plane*/ width * height / 2;
size_t bytesPerRowY = CVPixelBufferGetBytesPerRowOfPlane(imageBuffer, 0);
size_t bytesPerRowUV = CVPixelBufferGetBytesPerRowOfPlane(imageBuffer, 1);
void *mergedBuffer = malloc(totalSize);
if (!mergedBuffer) {
NSLog(@"Failed to allocate memory for merged buffer");
CVPixelBufferUnlockBaseAddress(imageBuffer, kCVPixelBufferLock_ReadOnly);
CVBufferRelease(imageBuffer);
return;
}
// Truncate data where we know it should end to strip padding
void *yPlaneBuf = CVPixelBufferGetBaseAddressOfPlane(imageBuffer, 0);
for (size_t row = 0; row < height; ++row) {
memcpy(mergedBuffer + row * width, yPlaneBuf + row * bytesPerRowY, width);
}
void *uvPlaneBuf = CVPixelBufferGetBaseAddressOfPlane(imageBuffer, 1);
for (size_t row = 0; row < height / 2; ++row) {
memcpy(mergedBuffer + width * height + row * width, uvPlaneBuf + row * bytesPerRowUV, width);
}
_mCallback(_mPUserData, mergedBuffer, (int)totalSize);
free(mergedBuffer);
} else {
void *buf = CVPixelBufferGetBaseAddress(imageBuffer);
size_t dataSize = CVPixelBufferGetDataSize(imageBuffer);
_mCallback(_mPUserData, buf, (int)dataSize);
}
void *buf = CVPixelBufferGetBaseAddressOfPlane(imageBuffer, 0);
size_t dataSize = CVPixelBufferGetDataSize(imageBuffer);
_mCallback(_mPUserData, buf, (int)dataSize);
CVPixelBufferUnlockBaseAddress(imageBuffer, 0);
CVPixelBufferUnlockBaseAddress(imageBuffer, kCVPixelBufferLock_ReadOnly);
CVBufferRelease(imageBuffer);
}