media: Implement zero-copy video playback for VP8.

media/filters/vpx_video_decoder.h

 // 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/macros.h"
 #include "base/threading/thread_checker.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"
 #include "media/base/video_frame_pool.h"
 
 struct vpx_codec_ctx;
 struct vpx_image;
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace media {
+class GpuMemoryBufferVideoFramePool;
 
 // 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.
 // Alpha channel, if any, is sent in the DecoderBuffer's side_data() as a frame
 // on its own of which the Y channel is taken [1].
 // [1] http://wiki.webmproject.org/alpha-channel
 class MEDIA_EXPORT VpxVideoDecoder : public VideoDecoder {
  public:
   VpxVideoDecoder();
+  explicit VpxVideoDecoder(
+      std::unique_ptr<GpuMemoryBufferVideoFramePool> gpu_video_frame_pool);
   ~VpxVideoDecoder() override;
 
   // VideoDecoder implementation.
   std::string GetDisplayName() const override;
   void Initialize(const VideoDecoderConfig& config,
                   bool low_delay,
                   CdmContext* cdm_context,
                   const InitCB& init_cb,
                   const OutputCB& output_cb) override;
   void Decode(const scoped_refptr<DecoderBuffer>& buffer,
@@ skipping 21 matching lines @@
   void DecodeBuffer(const scoped_refptr<DecoderBuffer>& buffer,
                     const DecodeCB& bound_decode_cb);
 
   // Try to decode |buffer| into |video_frame|. Return true if all decoding
   // succeeded. Note that decoding can succeed and still |video_frame| be
   // nullptr if there has been a partial decoding.
   bool VpxDecode(const scoped_refptr<DecoderBuffer>& buffer,
                  scoped_refptr<VideoFrame>* video_frame);
 
   bool CopyVpxImageToVideoFrame(const struct vpx_image* vpx_image,
+                                const scoped_refptr<DecoderBuffer>& buffer,
                                 scoped_refptr<VideoFrame>* video_frame);
 
   base::ThreadChecker thread_checker_;
 
   // |state_| must only be read and written to on |offload_task_runner_| if it
   // is non-null and there are outstanding tasks on the offload thread.
   DecoderState state_;
 
   OutputCB output_cb_;
 
   VideoDecoderConfig config_;
 
   vpx_codec_ctx* vpx_codec_;
   vpx_codec_ctx* vpx_codec_alpha_;
 
   // |memory_pool_| is a single-threaded memory pool used for VP9 decoding
   // with no alpha. |frame_pool_| is used for all other cases.
   class MemoryPool;
   scoped_refptr<MemoryPool> memory_pool_;
 
   // High resolution vp9 may block the media thread for too long, in such cases
   // we share a per-process thread to avoid overly long blocks.
   scoped_refptr<base::SingleThreadTaskRunner> offload_task_runner_;
 
-  VideoFramePool frame_pool_;
+  std::unique_ptr<GpuMemoryBufferVideoFramePool> gpu_video_frame_pool_;
 
   DISALLOW_COPY_AND_ASSIGN(VpxVideoDecoder);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_VPX_VIDEO_DECODER_H_