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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef mozilla_AppleVTDecoder_h
#define mozilla_AppleVTDecoder_h
#include <CoreFoundation/CFDictionary.h> // For CFDictionaryRef
#include <CoreMedia/CoreMedia.h> // For CMVideoFormatDescriptionRef
#include <VideoToolbox/VideoToolbox.h> // For VTDecompressionSessionRef
#include "AppleDecoderModule.h"
#include "PlatformDecoderModule.h"
#include "ReorderQueue.h"
#include "TimeUnits.h"
#include "mozilla/Atomics.h"
#include "mozilla/gfx/Types.h"
namespace mozilla {
DDLoggedTypeDeclNameAndBase(AppleVTDecoder, MediaDataDecoder);
class AppleVTDecoder : public MediaDataDecoder,
public DecoderDoctorLifeLogger<AppleVTDecoder> {
AppleVTDecoder(const VideoInfo& aConfig,
layers::ImageContainer* aImageContainer,
CreateDecoderParams::OptionSet aOptions,
layers::KnowsCompositor* aKnowsCompositor);
class AppleFrameRef {
media::TimeUnit decode_timestamp;
media::TimeUnit composition_timestamp;
media::TimeUnit duration;
int64_t byte_offset;
bool is_sync_point;
explicit AppleFrameRef(const MediaRawData& aSample)
: decode_timestamp(aSample.mTimecode),
is_sync_point(aSample.mKeyframe) {}
RefPtr<InitPromise> Init() override;
RefPtr<DecodePromise> Decode(MediaRawData* aSample) override;
RefPtr<DecodePromise> Drain() override;
RefPtr<FlushPromise> Flush() override;
RefPtr<ShutdownPromise> Shutdown() override;
void SetSeekThreshold(const media::TimeUnit& aTime) override;
bool IsHardwareAccelerated(nsACString& aFailureReason) const override {
return mIsHardwareAccelerated;
nsCString GetDescriptionName() const override {
return mIsHardwareAccelerated ? "apple hardware VT decoder"_ns
: "apple software VT decoder"_ns;
ConversionRequired NeedsConversion() const override {
return ConversionRequired::kNeedAVCC;
// Access from the taskqueue and the decoder's thread.
// OutputFrame is thread-safe.
void OutputFrame(CVPixelBufferRef aImage, AppleFrameRef aFrameRef);
void OnDecodeError(OSStatus aError);
friend class AppleDecoderModule; // To access InitializeSession.
virtual ~AppleVTDecoder();
RefPtr<FlushPromise> ProcessFlush();
RefPtr<DecodePromise> ProcessDrain();
void ProcessShutdown();
void ProcessDecode(MediaRawData* aSample);
void MaybeResolveBufferedFrames();
void AssertOnTaskQueue() { MOZ_ASSERT(mTaskQueue->IsCurrentThreadIn()); }
AppleFrameRef* CreateAppleFrameRef(const MediaRawData* aSample);
CFDictionaryRef CreateOutputConfiguration();
const RefPtr<MediaByteBuffer> mExtraData;
const uint32_t mPictureWidth;
const uint32_t mPictureHeight;
const uint32_t mDisplayWidth;
const uint32_t mDisplayHeight;
const gfx::YUVColorSpace mColorSpace;
const gfx::TransferFunction mTransferFunction;
const gfx::ColorRange mColorRange;
const gfx::ColorDepth mColorDepth;
// Method to set up the decompression session.
MediaResult InitializeSession();
nsresult WaitForAsynchronousFrames();
CFDictionaryRef CreateDecoderSpecification();
CFDictionaryRef CreateDecoderExtensions();
enum class StreamType { Unknown, H264, VP9 };
const StreamType mStreamType;
const RefPtr<TaskQueue> mTaskQueue;
const uint32_t mMaxRefFrames;
const RefPtr<layers::ImageContainer> mImageContainer;
const RefPtr<layers::KnowsCompositor> mKnowsCompositor;
const bool mUseSoftwareImages;
// Set on reader/decode thread calling Flush() to indicate that output is
// not required and so input samples on mTaskQueue need not be processed.
Atomic<bool> mIsFlushing;
// Protects mReorderQueue and mPromise.
Monitor mMonitor MOZ_UNANNOTATED;
ReorderQueue mReorderQueue;
MozMonitoredPromiseHolder<DecodePromise> mPromise;
// Decoded frame will be dropped if its pts is smaller than this
// value. It shold be initialized before Input() or after Flush(). So it is
// safe to access it in OutputFrame without protecting.
Maybe<media::TimeUnit> mSeekTargetThreshold;
CMVideoFormatDescriptionRef mFormat;
VTDecompressionSessionRef mSession;
Atomic<bool> mIsHardwareAccelerated;
} // namespace mozilla
#endif // mozilla_AppleVTDecoder_h