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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_H264Converter_h
#define mozilla_H264Converter_h
#include "PlatformDecoderModule.h"
#include "mozilla/Atomics.h"
#include "mozilla/Maybe.h"
#include "mozilla/UniquePtr.h"
namespace mozilla {
DDLoggedTypeDeclNameAndBase(MediaChangeMonitor, MediaDataDecoder);
// MediaChangeMonitor is a MediaDataDecoder wrapper used to ensure that
// only one type of content is fed to the underlying MediaDataDecoder.
// The MediaChangeMonitor allows playback of content where some out of band
// extra data (such as SPS NAL for H264 content) may not be provided in the
// init segment (e.g. AVC3 or Annex B) MediaChangeMonitor will monitor the
// input data, and will delay creation of the MediaDataDecoder until such out
// of band have been extracted should the underlying decoder required it.
class MediaChangeMonitor : public MediaDataDecoder,
public DecoderDoctorLifeLogger<MediaChangeMonitor> {
static RefPtr<PlatformDecoderModule::CreateDecoderPromise> Create(
PlatformDecoderModule* aPDM, const CreateDecoderParams& aParams);
RefPtr<InitPromise> Init() override;
RefPtr<DecodePromise> Decode(MediaRawData* aSample) override;
RefPtr<DecodePromise> Drain() override;
RefPtr<FlushPromise> Flush() override;
RefPtr<ShutdownPromise> Shutdown() override;
bool IsHardwareAccelerated(nsACString& aFailureReason) const override;
nsCString GetDescriptionName() const override {
if (mDecoder) {
return mDecoder->GetDescriptionName();
return "MediaChangeMonitor decoder (pending)"_ns;
void SetSeekThreshold(const media::TimeUnit& aTime) override;
bool SupportDecoderRecycling() const override {
if (mDecoder) {
return mDecoder->SupportDecoderRecycling();
return false;
ConversionRequired NeedsConversion() const override {
if (mDecoder) {
return mDecoder->NeedsConversion();
// Default so no conversion is performed.
return ConversionRequired::kNeedNone;
class CodecChangeMonitor {
virtual bool CanBeInstantiated() const = 0;
virtual MediaResult CheckForChange(MediaRawData* aSample) = 0;
virtual const TrackInfo& Config() const = 0;
virtual MediaResult PrepareSample(
MediaDataDecoder::ConversionRequired aConversion, MediaRawData* aSample,
bool aNeedKeyFrame) = 0;
virtual ~CodecChangeMonitor() = default;
MediaChangeMonitor(PlatformDecoderModule* aPDM,
UniquePtr<CodecChangeMonitor>&& aCodecChangeMonitor,
MediaDataDecoder* aDecoder,
const CreateDecoderParams& aParams);
virtual ~MediaChangeMonitor();
void AssertOnThread() const {
// mThread may not be set if Init hasn't been called first.
MOZ_ASSERT(!mThread || mThread->IsOnCurrentThread());
bool CanRecycleDecoder() const;
typedef MozPromise<bool, MediaResult, true /* exclusive */>
// Will create the required MediaDataDecoder if need AVCC and we have a SPS
// NAL. Returns NS_ERROR_FAILURE if error is permanent and can't be recovered
// and will set mError accordingly.
RefPtr<CreateDecoderPromise> CreateDecoder();
MediaResult CreateDecoderAndInit(MediaRawData* aSample);
MediaResult CheckForChange(MediaRawData* aSample);
void DecodeFirstSample(MediaRawData* aSample);
void DrainThenFlushDecoder(MediaRawData* aPendingSample);
void FlushThenShutdownDecoder(MediaRawData* aPendingSample);
RefPtr<ShutdownPromise> ShutdownDecoder();
UniquePtr<CodecChangeMonitor> mChangeMonitor;
RefPtr<PlatformDecoderModule> mPDM;
VideoInfo mCurrentConfig;
nsCOMPtr<nsISerialEventTarget> mThread;
RefPtr<MediaDataDecoder> mDecoder;
MozPromiseRequestHolder<CreateDecoderPromise> mDecoderRequest;
MozPromiseRequestHolder<InitPromise> mInitPromiseRequest;
MozPromiseHolder<InitPromise> mInitPromise;
MozPromiseRequestHolder<DecodePromise> mDecodePromiseRequest;
MozPromiseHolder<DecodePromise> mDecodePromise;
MozPromiseRequestHolder<FlushPromise> mFlushRequest;
MediaDataDecoder::DecodedData mPendingFrames;
MozPromiseRequestHolder<DecodePromise> mDrainRequest;
MozPromiseRequestHolder<ShutdownPromise> mShutdownRequest;
RefPtr<ShutdownPromise> mShutdownPromise;
MozPromiseHolder<FlushPromise> mFlushPromise;
bool mNeedKeyframe = true;
Maybe<bool> mCanRecycleDecoder;
Maybe<MediaDataDecoder::ConversionRequired> mConversionRequired;
bool mDecoderInitialized = false;
const CreateDecoderParamsForAsync mParams;
} // namespace mozilla
#endif // mozilla_H264Converter_h