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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_GPU_VP9_DECODER_H_
#define MEDIA_GPU_VP9_DECODER_H_
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <vector>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "media/filters/vp9_parser.h"
#include "media/gpu/accelerated_video_decoder.h"
#include "media/gpu/vp9_picture.h"
namespace media {
// This class implements an AcceleratedVideoDecoder for VP9 decoding.
// Clients of this class are expected to pass raw VP9 stream and are expected
// to provide an implementation of VP9Accelerator for offloading final steps
// of the decoding process.
//
// This class must be created, called and destroyed on a single thread, and
// does nothing internally on any other thread.
class MEDIA_GPU_EXPORT VP9Decoder : public AcceleratedVideoDecoder {
public:
class MEDIA_GPU_EXPORT VP9Accelerator {
public:
VP9Accelerator();
virtual ~VP9Accelerator();
// Create a new VP9Picture that the decoder client can use for initial
// stages of the decoding process and pass back to this accelerator for
// final, accelerated stages of it, or for reference when decoding other
// pictures.
//
// When a picture is no longer needed by the decoder, it will just drop
// its reference to it, and it may do so at any time.
//
// Note that this may return nullptr if the accelerator is not able to
// provide any new pictures at the given time. The decoder must handle this
// case and treat it as normal, returning kRanOutOfSurfaces from Decode().
virtual scoped_refptr<VP9Picture> CreateVP9Picture() = 0;
// Submit decode for |pic| to be run in accelerator, taking as arguments
// information contained in it, as well as current segmentation and loop
// filter state in |seg| and |lf|, respectively, and using pictures in
// |ref_pictures| for reference.
//
// Note that returning from this method does not mean that the decode
// process is finished, but the caller may drop its references to |pic|
// and |ref_pictures| immediately, and the data in |seg| and |lf| does not
// need to remain valid after this method returns.
//
// Return true when successful, false otherwise.
virtual bool SubmitDecode(
const scoped_refptr<VP9Picture>& pic,
const media::Vp9Segmentation& seg,
const media::Vp9LoopFilter& lf,
const std::vector<scoped_refptr<VP9Picture>>& ref_pictures) = 0;
// Schedule output (display) of |pic|.
//
// Note that returning from this method does not mean that |pic| has already
// been outputted (displayed), but guarantees that all pictures will be
// outputted in the same order as this method was called for them, and that
// they are decoded before outputting (assuming SubmitDecode() has been
// called for them beforehand). Decoder may drop its references to |pic|
// immediately after calling this method.
//
// Return true when successful, false otherwise.
virtual bool OutputPicture(const scoped_refptr<VP9Picture>& pic) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(VP9Accelerator);
};
VP9Decoder(VP9Accelerator* accelerator);
~VP9Decoder() override;
// media::AcceleratedVideoDecoder implementation.
void SetStream(const uint8_t* ptr, size_t size) override;
bool Flush() override WARN_UNUSED_RESULT;
void Reset() override;
DecodeResult Decode() override WARN_UNUSED_RESULT;
gfx::Size GetPicSize() const override;
size_t GetRequiredNumOfPictures() const override;
private:
// Update ref_frames_ based on the information in current frame header.
void RefreshReferenceFrames(const scoped_refptr<VP9Picture>& pic);
// Decode and possibly output |pic| (if the picture is to be shown).
// Return true on success, false otherwise.
bool DecodeAndOutputPicture(scoped_refptr<VP9Picture> pic);
// Called on error, when decoding cannot continue. Sets state_ to kError and
// releases current state.
void SetError();
enum State {
kNeedStreamMetadata, // After initialization, need a keyframe.
kDecoding, // Ready to decode from any point.
kAfterReset, // After Reset(), need a resume point.
kError, // Error in decode, can't continue.
};
// Current decoder state.
State state_;
// Current frame header to be used in decoding the next picture.
std::unique_ptr<media::Vp9FrameHeader> curr_frame_hdr_;
// Reference frames currently in use.
std::vector<scoped_refptr<VP9Picture>> ref_frames_;
// Current coded resolution.
gfx::Size pic_size_;
media::Vp9Parser parser_;
// VP9Accelerator instance owned by the client.
VP9Accelerator* accelerator_;
DISALLOW_COPY_AND_ASSIGN(VP9Decoder);
};
} // namespace media
#endif // MEDIA_GPU_VP9_DECODER_H_