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// Copyright (c) 2012 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_FILTERS_FFMPEG_VIDEO_DECODER_H_
#define MEDIA_FILTERS_FFMPEG_VIDEO_DECODER_H_
#include <list>
#include "base/callback.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "media/base/video_decoder.h"
#include "media/base/video_decoder_config.h"
#include "media/base/video_frame_pool.h"
struct AVCodecContext;
struct AVFrame;
namespace base {
class MessageLoopProxy;
}
namespace media {
class DecoderBuffer;
class ScopedPtrAVFreeContext;
class ScopedPtrAVFreeFrame;
class MEDIA_EXPORT FFmpegVideoDecoder : public VideoDecoder {
public:
explicit FFmpegVideoDecoder(
const scoped_refptr<base::MessageLoopProxy>& message_loop);
virtual ~FFmpegVideoDecoder();
// VideoDecoder implementation.
virtual void Initialize(const VideoDecoderConfig& config,
const PipelineStatusCB& status_cb) OVERRIDE;
virtual void Decode(const scoped_refptr<DecoderBuffer>& buffer,
const DecodeCB& decode_cb) OVERRIDE;
virtual void Reset(const base::Closure& closure) OVERRIDE;
virtual void Stop(const base::Closure& closure) OVERRIDE;
// Callback called from within FFmpeg to allocate a buffer based on
// the dimensions of |codec_context|. See AVCodecContext.get_buffer
// documentation inside FFmpeg.
int GetVideoBuffer(AVCodecContext *codec_context, AVFrame* frame);
private:
enum DecoderState {
kUninitialized,
kNormal,
kFlushCodec,
kDecodeFinished,
kError
};
// Handles decoding an unencrypted encoded buffer.
void DecodeBuffer(const scoped_refptr<DecoderBuffer>& buffer);
bool FFmpegDecode(const scoped_refptr<DecoderBuffer>& buffer,
scoped_refptr<VideoFrame>* video_frame);
// Handles (re-)initializing the decoder with a (new) config.
// Returns true if initialization was successful.
bool ConfigureDecoder();
// Releases resources associated with |codec_context_| and |av_frame_|
// and resets them to NULL.
void ReleaseFFmpegResources();
// Reset decoder and call |reset_cb_|.
void DoReset();
scoped_refptr<base::MessageLoopProxy> message_loop_;
base::WeakPtrFactory<FFmpegVideoDecoder> weak_factory_;
base::WeakPtr<FFmpegVideoDecoder> weak_this_;
DecoderState state_;
DecodeCB decode_cb_;
base::Closure reset_cb_;
// FFmpeg structures owned by this object.
scoped_ptr_malloc<AVCodecContext, ScopedPtrAVFreeContext> codec_context_;
scoped_ptr_malloc<AVFrame, ScopedPtrAVFreeFrame> av_frame_;
VideoDecoderConfig config_;
VideoFramePool frame_pool_;
DISALLOW_COPY_AND_ASSIGN(FFmpegVideoDecoder);
};
} // namespace media
#endif // MEDIA_FILTERS_FFMPEG_VIDEO_DECODER_H_
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