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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_VPX_VIDEO_DECODER_H_
#define MEDIA_FILTERS_VPX_VIDEO_DECODER_H_
#include "base/callback.h"
#include "base/memory/weak_ptr.h"
#include "media/base/demuxer_stream.h"
#include "media/base/video_decoder.h"
#include "media/base/video_decoder_config.h"
#include "media/base/video_frame.h"
struct vpx_codec_ctx;
struct vpx_image;
namespace base {
class MessageLoopProxy;
}
namespace media {
// Libvpx video decoder wrapper.
// Note: VpxVideoDecoder accepts only YV12A VP8 content or VP9 content. This is
// done to avoid usurping FFmpeg for all vp8 decoding, because the FFmpeg VP8
// decoder is faster than the libvpx VP8 decoder.
class MEDIA_EXPORT VpxVideoDecoder : public VideoDecoder {
public:
explicit VpxVideoDecoder(
const scoped_refptr<base::MessageLoopProxy>& message_loop);
virtual ~VpxVideoDecoder();
// 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;
virtual bool HasAlpha() const OVERRIDE;
private:
enum DecoderState {
kUninitialized,
kNormal,
kFlushCodec,
kDecodeFinished,
kError
};
// Handles (re-)initializing the decoder with a (new) config.
// Returns true when initialization was successful.
bool ConfigureDecoder(const VideoDecoderConfig& config);
void CloseDecoder();
void DecodeBuffer(const scoped_refptr<DecoderBuffer>& buffer);
bool VpxDecode(const scoped_refptr<DecoderBuffer>& buffer,
scoped_refptr<VideoFrame>* video_frame);
// Reset decoder and call |reset_cb_|.
void DoReset();
void CopyVpxImageTo(const vpx_image* vpx_image,
const struct vpx_image* vpx_image_alpha,
scoped_refptr<VideoFrame>* video_frame);
scoped_refptr<base::MessageLoopProxy> message_loop_;
base::WeakPtrFactory<VpxVideoDecoder> weak_factory_;
base::WeakPtr<VpxVideoDecoder> weak_this_;
DecoderState state_;
DecodeCB decode_cb_;
base::Closure reset_cb_;
VideoDecoderConfig config_;
vpx_codec_ctx* vpx_codec_;
vpx_codec_ctx* vpx_codec_alpha_;
DISALLOW_COPY_AND_ASSIGN(VpxVideoDecoder);
};
} // namespace media
#endif // MEDIA_FILTERS_VPX_VIDEO_DECODER_H_
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