| // 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, |
| const InitCB& init_cb, |
| const OutputCB& output_cb, |
| const WaitingCB& waiting_cb) override; |
| void Decode(scoped_refptr<DecoderBuffer> buffer, |
| const DecodeCB& decode_cb) override; |
| void Reset(const base::RepeatingClosure& 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, |
| const InitCB& init_cb, |
| const OutputCB& output_cb, |
| const WaitingCB& waiting_cb, |
| bool success); |
| |
| 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_; |
| |
| DISALLOW_COPY_AND_ASSIGN(FallbackVideoDecoder); |
| }; |
| |
| } // namespace media |
| |
| #endif // MEDIA_BASE_FALLBACK_VIDEO_DECODER_H_ |