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// Copyright (c) 2011 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_VIDEO_FFMPEG_VIDEO_ALLOCATOR_H_
#define MEDIA_VIDEO_FFMPEG_VIDEO_ALLOCATOR_H_
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "media/base/video_frame.h"
#include "media/ffmpeg/ffmpeg_common.h"
#include <deque>
#include <map>
// FFmpeg types.
struct AVCodecContext;
struct AVFrame;
struct AVStream;
namespace media {
class FFmpegVideoAllocator {
public:
FFmpegVideoAllocator();
virtual ~FFmpegVideoAllocator();
struct RefCountedAVFrame {
explicit RefCountedAVFrame(AVFrame* av_frame)
: av_frame_(*av_frame),
usage_count_(0) {}
// TODO(jiesun): we had commented out "DCHECK_EQ(usage_count_, 0);" here.
// Because the way FFMPEG-MT handle release buffer in delayed fashion.
// Probably we could wait FFMPEG-MT release all buffers before we callback
// the flush completion.
~RefCountedAVFrame() {}
void AddRef() {
base::AtomicRefCountIncN(&usage_count_, 1);
}
bool Release() {
return base::AtomicRefCountDecN(&usage_count_, 1);
}
// Technically AVFrame should *always* be heap-allocated via
// avcodec_alloc_frame() otherwise (while rare) we can run into nasty binary
// mismatch incompatibility stuff if people swap binaries (which might
// happen with some Linux distributions). See http://crbug.com/77629.
AVFrame av_frame_;
base::AtomicRefCount usage_count_;
};
static int AllocateBuffer(AVCodecContext* codec_context, AVFrame* av_frame);
static void ReleaseBuffer(AVCodecContext* codec_context, AVFrame* av_frame);
void Initialize(AVCodecContext* codec_context,
VideoFrame::Format surface_format);
void Stop(AVCodecContext* codec_context);
// DisplayDone() is called when renderer has finished using a frame.
void DisplayDone(AVCodecContext* codec_context,
scoped_refptr<VideoFrame> video_frame);
// DecodeDone() is called after avcodec_video_decode() finish so that we can
// acquire a reference to the video frame before we hand it to the renderer.
scoped_refptr<VideoFrame> DecodeDone(AVCodecContext* codec_context,
AVFrame* av_frame);
private:
int InternalAllocateBuffer(AVCodecContext* codec_context, AVFrame* av_frame);
void InternalReleaseBuffer(AVCodecContext* codec_context, AVFrame* av_frame);
VideoFrame::Format surface_format_;
// This queue keeps reference count for all VideoFrame allocated.
std::deque<RefCountedAVFrame*> frame_pool_;
// This queue keeps per-AVCodecContext VideoFrame allocation that
// was available for recycling.
static const int kMaxFFmpegThreads = 3;
std::deque<RefCountedAVFrame*> available_frames_[kMaxFFmpegThreads];
// This map is used to map from AVCodecContext* to index to
// |available_frames_|, because ffmpeg-mt maintain multiple
// AVCodecContext (per thread).
std::map<AVCodecContext*, int> codec_index_map_;
// These function pointers store the original AVCodecContext's
// get_buffer()/release_buffer() function pointers. We use these functions
// to delegate the allocation request.
int (*get_buffer_)(AVCodecContext* c, AVFrame* pic);
void (*release_buffer_)(AVCodecContext* c, AVFrame* pic);
DISALLOW_COPY_AND_ASSIGN(FFmpegVideoAllocator);
};
} // namespace media
#endif // MEDIA_VIDEO_FFMPEG_VIDEO_ALLOCATOR_H_
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