| // Copyright 2016 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef COBALT_MEDIA_BASE_DECODER_BUFFER_CACHE_H_ |
| #define COBALT_MEDIA_BASE_DECODER_BUFFER_CACHE_H_ |
| |
| #include <deque> |
| |
| #include "base/memory/ref_counted.h" |
| #include "base/threading/thread_checker.h" |
| #include "base/time.h" |
| #include "cobalt/media/base/decoder_buffer.h" |
| #include "cobalt/media/base/demuxer_stream.h" |
| |
| namespace media { |
| |
| // This class can be used to hold media buffers in decoding order. It also |
| // provides function that given a media time, the function will find a key frame |
| // before the media time and clear all buffers before the key frame. This class |
| // can be used to "replay" the video from the current playback position and can |
| // be useful to implement suspend/resume. |
| class DecoderBufferCache { |
| public: |
| DecoderBufferCache(); |
| |
| void AddBuffer(DemuxerStream::Type type, |
| const scoped_refptr<DecoderBuffer>& buffer); |
| void ClearSegmentsBeforeMediaTime(base::TimeDelta media_time); |
| void ClearAll(); |
| |
| // Start resuming, reset indices to audio/video buffers to the very beginning. |
| void StartResuming(); |
| scoped_refptr<DecoderBuffer> GetBuffer(DemuxerStream::Type type) const; |
| void AdvanceToNextBuffer(DemuxerStream::Type type); |
| |
| private: |
| typedef std::deque<scoped_refptr<DecoderBuffer> > Buffers; |
| typedef std::deque<base::TimeDelta> KeyFrameTimestamps; |
| |
| static void ClearSegmentsBeforeMediaTime( |
| base::TimeDelta media_time, Buffers* buffers, |
| KeyFrameTimestamps* key_frame_timestamps); |
| |
| base::ThreadChecker thread_checker_; |
| |
| Buffers audio_buffers_; |
| KeyFrameTimestamps audio_key_frame_timestamps_; |
| |
| Buffers video_buffers_; |
| KeyFrameTimestamps video_key_frame_timestamps_; |
| |
| size_t audio_buffer_index_; |
| size_t video_buffer_index_; |
| }; |
| |
| } // namespace media |
| |
| #endif // COBALT_MEDIA_BASE_DECODER_BUFFER_CACHE_H_ |