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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 http://mozilla.org/MPL/2.0/. */
#ifndef __FFmpegVideoDecoder_h__
#define __FFmpegVideoDecoder_h__
#include "FFmpegDataDecoder.h"
#include "FFmpegLibWrapper.h"
#include "SimpleMap.h"
#ifdef MOZ_WAYLAND_USE_VAAPI
# include "mozilla/LinkedList.h"
# include "mozilla/widget/DMABufSurface.h"
#endif
namespace mozilla {
#ifdef MOZ_WAYLAND_USE_VAAPI
// DMABufSurfaceWrapper holds a reference to GPU data with a video frame.
//
// Actual GPU pixel data are stored at DMABufSurface and
// DMABufSurface is passed to gecko GL rendering pipeline via.
// DMABUFSurfaceImage.
//
// DMABufSurfaceWrapper can optionally hold VA-API ffmpeg related data to keep
// GPU data locked untill we need them.
//
// DMABufSurfaceWrapper is used for both HW accelerated video decoding (VA-API)
// and ffmpeg SW decoding.
//
// VA-API scenario
//
// When VA-API decoding is running, ffmpeg allocates AVHWFramesContext - a pool
// of "hardware" frames. Every "hardware" frame (VASurface) is backed
// by actual piece of GPU memory which holds the decoded image data.
//
// The VASurface is wrapped by DMABufSurface and transferred to
// rendering queue by DMABUFSurfaceImage, where TextureClient is
// created and VASurface is used as a texture there.
//
// As there's a limited number of VASurfaces, ffmpeg reuses them to decode
// next frames ASAP even if they are still attached to DMABufSurface
// and used as a texture in our rendering engine.
//
// Unfortunately there isn't any obvious way how to mark particular VASurface
// as used. The best we can do is to hold a reference to particular AVBuffer
// from decoded AVFrame and AVHWFramesContext which owns the AVBuffer.
//
// FFmpeg SW decoding scenario
//
// When SW ffmpeg decoding is running, DMABufSurfaceWrapper contains only
// a DMABufSurface reference and VA-API related members are null.
// We own the DMABufSurface underlying GPU data and we use it for
// repeated rendering of video frames.
//
template <int V>
class DMABufSurfaceWrapper {};
template <>
class DMABufSurfaceWrapper<LIBAV_VER>;
template <>
class DMABufSurfaceWrapper<LIBAV_VER> final {
public:
DMABufSurfaceWrapper(DMABufSurface* aSurface, FFmpegLibWrapper* aLib);
~DMABufSurfaceWrapper();
// Lock VAAPI related data
void LockVAAPIData(AVCodecContext* aAVCodecContext, AVFrame* aAVFrame);
// Release VAAPI related data, DMABufSurface can be reused
// for another frame.
void ReleaseVAAPIData();
// Check if DMABufSurface is used by any gecko rendering process
// (WebRender or GL compositor) or by DMABUFSurfaceImage/VideoData.
bool IsUsed() const { return mSurface->IsGlobalRefSet(); }
RefPtr<DMABufSurfaceYUV> GetDMABufSurface() const {
return mSurface->GetAsDMABufSurfaceYUV();
}
// Don't allow DMABufSurfaceWrapper plain copy as it leads to
// enexpected DMABufSurface/HW buffer releases and we don't want to
// deep copy them.
DMABufSurfaceWrapper(const DMABufSurfaceWrapper&) = delete;
const DMABufSurfaceWrapper& operator=(DMABufSurfaceWrapper const&) = delete;
private:
const RefPtr<DMABufSurface> mSurface;
const FFmpegLibWrapper* mLib;
AVBufferRef* mAVHWFramesContext;
AVBufferRef* mHWAVBuffer;
};
#endif
template <int V>
class FFmpegVideoDecoder : public FFmpegDataDecoder<V> {};
template <>
class FFmpegVideoDecoder<LIBAV_VER>;
DDLoggedTypeNameAndBase(FFmpegVideoDecoder<LIBAV_VER>,
FFmpegDataDecoder<LIBAV_VER>);
template <>
class FFmpegVideoDecoder<LIBAV_VER>
: public FFmpegDataDecoder<LIBAV_VER>,
public DecoderDoctorLifeLogger<FFmpegVideoDecoder<LIBAV_VER>> {
typedef mozilla::layers::Image Image;
typedef mozilla::layers::ImageContainer ImageContainer;
typedef mozilla::layers::KnowsCompositor KnowsCompositor;
typedef SimpleMap<int64_t> DurationMap;
public:
FFmpegVideoDecoder(FFmpegLibWrapper* aLib, const VideoInfo& aConfig,
KnowsCompositor* aAllocator,
ImageContainer* aImageContainer, bool aLowLatency,
bool aDisableHardwareDecoding);
RefPtr<InitPromise> Init() override;
void InitCodecContext() override;
nsCString GetDescriptionName() const override {
#ifdef USING_MOZFFVPX
return "ffvpx video decoder"_ns;
#else
return "ffmpeg video decoder"_ns;
#endif
}
ConversionRequired NeedsConversion() const override {
return ConversionRequired::kNeedAVCC;
}
static AVCodecID GetCodecId(const nsACString& aMimeType);
private:
RefPtr<FlushPromise> ProcessFlush() override;
void ProcessShutdown() override;
MediaResult DoDecode(MediaRawData* aSample, uint8_t* aData, int aSize,
bool* aGotFrame, DecodedData& aResults) override;
void OutputDelayedFrames();
bool NeedParser() const override {
return
#if LIBAVCODEC_VERSION_MAJOR >= 58
false;
#else
# if LIBAVCODEC_VERSION_MAJOR >= 55
mCodecID == AV_CODEC_ID_VP9 ||
# endif
mCodecID == AV_CODEC_ID_VP8;
#endif
}
gfx::YUVColorSpace GetFrameColorSpace() const;
MediaResult CreateImage(int64_t aOffset, int64_t aPts, int64_t aDuration,
MediaDataDecoder::DecodedData& aResults) const;
#ifdef MOZ_WAYLAND_USE_VAAPI
MediaResult InitVAAPIDecoder();
bool CreateVAAPIDeviceContext();
void InitVAAPICodecContext();
AVCodec* FindVAAPICodec();
bool IsHardwareAccelerated(nsACString& aFailureReason) const override;
bool GetVAAPISurfaceDescriptor(VADRMPRIMESurfaceDescriptor& aVaDesc);
MediaResult CreateImageDMABuf(int64_t aOffset, int64_t aPts,
int64_t aDuration,
MediaDataDecoder::DecodedData& aResults);
void ReleaseUnusedVAAPIFrames();
DMABufSurfaceWrapper<LIBAV_VER>* GetUnusedDMABufSurfaceWrapper();
void ReleaseDMABufSurfaces();
#endif
/**
* This method allocates a buffer for FFmpeg's decoder, wrapped in an Image.
* Currently it only supports Planar YUV420, which appears to be the only
* non-hardware accelerated image format that FFmpeg's H264 decoder is
* capable of outputting.
*/
int AllocateYUV420PVideoBuffer(AVCodecContext* aCodecContext,
AVFrame* aFrame);
#ifdef MOZ_WAYLAND_USE_VAAPI
AVBufferRef* mVAAPIDeviceContext;
const bool mDisableHardwareDecoding;
VADisplay mDisplay;
bool mUseDMABufSurfaces;
nsTArray<DMABufSurfaceWrapper<LIBAV_VER>> mDMABufSurfaces;
#endif
RefPtr<KnowsCompositor> mImageAllocator;
RefPtr<ImageContainer> mImageContainer;
VideoInfo mInfo;
class PtsCorrectionContext {
public:
PtsCorrectionContext();
int64_t GuessCorrectPts(int64_t aPts, int64_t aDts);
void Reset();
int64_t LastDts() const { return mLastDts; }
private:
int64_t mNumFaultyPts; /// Number of incorrect PTS values so far
int64_t mNumFaultyDts; /// Number of incorrect DTS values so far
int64_t mLastPts; /// PTS of the last frame
int64_t mLastDts; /// DTS of the last frame
};
PtsCorrectionContext mPtsContext;
DurationMap mDurationMap;
const bool mLowLatency;
};
} // namespace mozilla
#endif // __FFmpegVideoDecoder_h__
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