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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.
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "media/filters/vp8_parser.h"
#include "media/gpu/accelerated_video_decoder.h"
#include "media/gpu/vp8_picture.h"
namespace media {
// Clients of this class are expected to pass raw VP8 stream and are expected
// to provide an implementation of VP8Accelerator 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 VP8Decoder : public AcceleratedVideoDecoder {
class MEDIA_GPU_EXPORT VP8Accelerator {
virtual ~VP8Accelerator();
// Create a new VP8Picture that the decoder client can use for decoding
// and pass back to this accelerator for decoding or reference.
// When the picture is no longer needed by decoder, it will just drop
// its reference to it, and it may do so at any time.
// Note that this may return nullptr if accelerator is not able to provide
// any new pictures at given time. The decoder is expected to handle
// this situation as normal and return from Decode() with kRanOutOfSurfaces.
virtual scoped_refptr<VP8Picture> CreateVP8Picture() = 0;
// Submit decode for |pic|, taking as arguments |frame_hdr| with parsed
// VP8 frame header information for current frame, and using |last_frame|,
// |golden_frame| and |alt_frame| as references, as per VP8 specification.
// Note that this runs the decode in hardware.
// Return true if successful.
virtual bool SubmitDecode(const scoped_refptr<VP8Picture>& pic,
const Vp8FrameHeader* frame_hdr,
const scoped_refptr<VP8Picture>& last_frame,
const scoped_refptr<VP8Picture>& golden_frame,
const scoped_refptr<VP8Picture>& alt_frame) = 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. Decoder may drop its reference
// to |pic| after calling this method.
// Return true if successful.
virtual bool OutputPicture(const scoped_refptr<VP8Picture>& pic) = 0;
VP8Decoder(VP8Accelerator* accelerator);
~VP8Decoder() override;
// AcceleratedVideoDecoder implementation.
bool Flush() override WARN_UNUSED_RESULT;
void Reset() override;
void SetStream(const uint8_t* ptr, size_t size) override;
DecodeResult Decode() override WARN_UNUSED_RESULT;
gfx::Size GetPicSize() const override;
size_t GetRequiredNumOfPictures() const override;
bool DecodeAndOutputCurrentFrame();
void RefreshReferenceFrames();
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.
State state_;
Vp8Parser parser_;
std::unique_ptr<Vp8FrameHeader> curr_frame_hdr_;
scoped_refptr<VP8Picture> curr_pic_;
scoped_refptr<VP8Picture> last_frame_;
scoped_refptr<VP8Picture> golden_frame_;
scoped_refptr<VP8Picture> alt_frame_;
const uint8_t* curr_frame_start_;
size_t frame_size_;
gfx::Size pic_size_;
int horizontal_scale_;
int vertical_scale_;
VP8Accelerator* accelerator_;
} // namespace media