Implement media::VideoDecodeAccelerator on Mac

content/common/gpu/media/mac_video_decode_accelerator.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 CONTENT_COMMON_GPU_MEDIA_MAC_VIDEO_DECODE_ACCELERATOR_H_
+#define CONTENT_COMMON_GPU_MEDIA_MAC_VIDEO_DECODE_ACCELERATOR_H_
+
+#include <CoreVideo/CoreVideo.h>
+#include <map>
+#include <list>
+
+#include "base/mac/scoped_cftyperef.h"
+#include "base/memory/ref_counted.h"
+#include "base/threading/non_thread_safe.h"
+#include "content/common/content_export.h"
+#include "media/video/video_decode_accelerator.h"
+
+namespace base {
+class RefCountedBytes;
+}
+namespace gfx {
+class GLContext;
+class VideoDecodeAccelerationSupport;
+}
+
+class GpuCommandBufferStub;
+
+class CONTENT_EXPORT MacVideoDecodeAccelerator
+    : public media::VideoDecodeAccelerator,
+      public base::NonThreadSafe {
+ public:
+  // Does not take ownership of |client| which must outlive |*this|.
+  MacVideoDecodeAccelerator(media::VideoDecodeAccelerator::Client* client);
+
+  // Set the OpenGL context to use.
+  void SetCGLContext(CGLContextObj cgl_context);
+
+  // Set extra data required to initialize the H.264 video decoder.
+  // TODO(sail): Move this into Initialize.
+  bool SetConfigInfo(uint32_t frame_width,
+                     uint32_t frame_height,
+                     const std::vector<uint8_t>& avc_data);
+
+  // media::VideoDecodeAccelerator implementation.
+  virtual bool Initialize(media::VideoCodecProfile profile) OVERRIDE;
+  virtual void Decode(const media::BitstreamBuffer& bitstream_buffer) OVERRIDE;
+  virtual void AssignPictureBuffers(
+      const std::vector<media::PictureBuffer>& buffers) OVERRIDE;
+  virtual void ReusePictureBuffer(int32 picture_buffer_id) OVERRIDE;
+  virtual void Flush() OVERRIDE;
+  virtual void Reset() OVERRIDE;
+  virtual void Destroy() OVERRIDE;
+
+ private:
+  virtual ~MacVideoDecodeAccelerator();
+
+  // Callback for a completed frame.
+  void OnFrameReady(int32 bitstream_buffer_id,
+                    scoped_refptr<base::RefCountedBytes> bytes,
+                    CVImageBufferRef image,
+                    int status);
+
+  // Sends available decoded frames to the client.
+  void SendImages();
+
+  // Stop the component when any error is detected.
+  void StopOnError(media::VideoDecodeAccelerator::Error error);
+
+  // Calls the client's initialize completed callback.
+  void NotifyInitializeDone();
+
+  // Requests pictures from the client.
+  void RequestPictures();
+
+  // Calls the client's flush completed callback.
+  void NotifyFlushDone();
+
+  // Calls the client's reset completed callback.
+  void NotifyResetDone();
+
+  // Notifies the client that the input buffer identifed by |input_buffer_id|
+  // has been processed.
+  void NotifyInputBufferRead(int input_buffer_id);
+
+  // To expose client callbacks from VideoDecodeAccelerator.
+  Client* client_;
+  // C++ wrapper around the Mac VDA API.
+  scoped_refptr<gfx::VideoDecodeAccelerationSupport> vda_support_;
+  // Picture buffers that are available for use by the decoder to draw decoded
+  // video frames on.
+  std::list<media::PictureBuffer> available_pictures_;
+
+  // Maps ids to picture buffers that are in use by the client.
+  struct UsedPictureInfo {
+    UsedPictureInfo(const media::PictureBuffer& pic,
+                    const base::mac::ScopedCFTypeRef<CVImageBufferRef>& image);
+    ~UsedPictureInfo();
+    const media::PictureBuffer picture_buffer;
+    const base::mac::ScopedCFTypeRef<CVImageBufferRef> image;
+  };
+  std::map<int32, UsedPictureInfo> used_pictures_;
+
+  // List of decoded images waiting to be sent to the client.
+  struct DecodedImageInfo {
+    DecodedImageInfo();
+    ~DecodedImageInfo();
+    base::mac::ScopedCFTypeRef<CVImageBufferRef> image;
+    int32 bitstream_buffer_id;
+  };
+  std::list<DecodedImageInfo> decoded_images_;
+
+  // The context to use to perform OpenGL operations.
+  CGLContextObj cgl_context_;
+
+  // The number of bytes used to store the frame buffer size.
+  size_t nalu_len_field_size_;
+
+  // Size of a video frame.
+  gfx::Size frame_size_;
+
+  // Flag to check if pictures have been requested from the client.
+  bool did_request_pictures_;
+};
+
+#endif  // CONTENT_COMMON_GPU_MEDIA_VIDEO_DECODE_ACCELERATOR_MAC_H_