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// 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 MEDIA_BASE_DECODER_BUFFER_CACHE_H_
#define 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 "media/base/decoder_buffer.h"
#include "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 // MEDIA_BASE_DECODER_BUFFER_CACHE_H_