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// Copyright 2018 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_BASE_FALLBACK_VIDEO_DECODER_H_
#define MEDIA_BASE_FALLBACK_VIDEO_DECODER_H_
#include <memory>
#include <string>
#include "base/memory/weak_ptr.h"
#include "media/base/video_decoder.h"
namespace media {
// A Wrapper VideoDecoder which supports a fallback and a preferred decoder.
class MEDIA_EXPORT FallbackVideoDecoder : public VideoDecoder {
public:
FallbackVideoDecoder(std::unique_ptr<VideoDecoder> preferred,
std::unique_ptr<VideoDecoder> fallback);
// media::VideoDecoder implementation.
std::string GetDisplayName() const override;
void Initialize(const VideoDecoderConfig& config,
bool low_delay,
CdmContext* cdm_context,
InitCB init_cb,
const OutputCB& output_cb,
const WaitingCB& waiting_cb) override;
void Decode(scoped_refptr<DecoderBuffer> buffer, DecodeCB decode_cb) override;
void Reset(base::OnceClosure reset_cb) override;
bool NeedsBitstreamConversion() const override;
bool CanReadWithoutStalling() const override;
int GetMaxDecodeRequests() const override;
protected:
~FallbackVideoDecoder() override;
private:
void FallbackInitialize(const VideoDecoderConfig& config,
bool low_delay,
CdmContext* cdm_context,
InitCB init_cb,
const OutputCB& output_cb,
const WaitingCB& waiting_cb,
Status status);
std::unique_ptr<media::VideoDecoder> preferred_decoder_;
std::unique_ptr<media::VideoDecoder> fallback_decoder_;
media::VideoDecoder* selected_decoder_ = nullptr;
bool did_fallback_ = false;
base::WeakPtrFactory<FallbackVideoDecoder> weak_factory_{this};
DISALLOW_COPY_AND_ASSIGN(FallbackVideoDecoder);
};
} // namespace media
#endif // MEDIA_BASE_FALLBACK_VIDEO_DECODER_H_
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