void
AppleVTDecoder::ProcessFlush()
{
AssertOnTaskQueueThread();
nsresult rv = WaitForAsynchronousFrames();
if (NS_FAILED(rv)) {
LOG("AppleVTDecoder::Flush failed waiting for platform decoder "
"with error:%d.", rv);
}
ClearReorderedFrames();
}
void
AppleVTDecoder::ProcessDrain()
{
AssertOnTaskQueueThread();
nsresult rv = WaitForAsynchronousFrames();
if (NS_FAILED(rv)) {
LOG("AppleVTDecoder::Drain failed waiting for platform decoder "
"with error:%d.", rv);
}
DrainReorderedFrames();
mCallback->DrainComplete();
}
nsresult
AppleVTDecoder::DoDecode(MediaRawData* aSample)
{
AssertOnTaskQueueThread();
// For some reason this gives me a double-free error with stagefright.
AutoCFRelease<CMBlockBufferRef> block = nullptr;
AutoCFRelease<CMSampleBufferRef> sample = nullptr;
VTDecodeInfoFlags infoFlags;
OSStatus rv;
// FIXME: This copies the sample data. I think we can provide
// a custom block source which reuses the aSample buffer.
// But note that there may be a problem keeping the samples
// alive over multiple frames.
rv = CMBlockBufferCreateWithMemoryBlock(kCFAllocatorDefault, // Struct allocator.
const_cast<uint8_t*>(aSample->Data()),
aSample->Size(),
kCFAllocatorNull, // Block allocator.
NULL, // Block source.
0, // Data offset.
aSample->Size(),
false,
block.receive());
if (rv != noErr) {
NS_ERROR("Couldn't create CMBlockBuffer");
return NS_ERROR_FAILURE;
}
CMSampleTimingInfo timestamp = TimingInfoFromSample(aSample);
rv = CMSampleBufferCreate(kCFAllocatorDefault, block, true, 0, 0, mFormat, 1, 1, ×tamp, 0, NULL, sample.receive());
if (rv != noErr) {
NS_ERROR("Couldn't create CMSampleBuffer");
return NS_ERROR_FAILURE;
}
mQueuedSamples++;
VTDecodeFrameFlags decodeFlags =
kVTDecodeFrame_EnableAsynchronousDecompression;
rv = VTDecompressionSessionDecodeFrame(mSession,
sample,
decodeFlags,
CreateAppleFrameRef(aSample),
&infoFlags);
if (rv != noErr && !(infoFlags & kVTDecodeInfo_FrameDropped)) {
LOG("AppleVTDecoder: Error %d VTDecompressionSessionDecodeFrame", rv);
NS_WARNING("Couldn't pass frame to decoder");
mCallback->Error();
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult
AppleVTDecoder::ProcessDecode(MediaRawData* aSample)
{
AssertOnTaskQueueThread();
if (mIsFlushing) {
return NS_OK;
}
auto rv = DoDecode(aSample);
return rv;
}
