Implement PPAPI VideoDecode out-of-process support

ppapi/shared_impl/video_decoder_impl.h

+// 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 PPAPI_SHARED_IMPL_VIDEO_DECODER_IMPL_H_
+#define PPAPI_SHARED_IMPL_VIDEO_DECODER_IMPL_H_
+
+#include <map>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "ppapi/c/dev/ppb_video_decoder_dev.h"
+#include "ppapi/shared_impl/resource_object_base.h"
+#include "ppapi/thunk/ppb_video_decoder_api.h"
+
+namespace gpu {
+namespace gles2 {
+class GLES2Implementation;
+}  // namespace gles2
+}  // namespace gpu
+
+namespace ppapi {
+namespace thunk {
+class PPB_Context3D_API;
+}  // namespace thunk
+}  // namespace ppapi
+
+namespace ppapi {
+
+// Implements the logic to set and run callbacks for various video decoder
+// events. Both the proxy and the renderer implementation share this code.
+class VideoDecoderImpl : public ResourceObjectBase,
+                         public thunk::PPB_VideoDecoder_API {
+ public:
+  VideoDecoderImpl();
+  virtual ~VideoDecoderImpl();
+
+  // ResourceObjectBase implementation.
+  virtual PPB_VideoDecoder_API* AsPPB_VideoDecoder_API() OVERRIDE;
+
+  // PPB_VideoDecoder_API implementation.
+  virtual void Destroy() OVERRIDE;
+
+  // Copy C-style config list into |out_configs| vector.
+  static bool CopyConfigsToVector(
+      const PP_VideoConfigElement* configs_to_copy,
+      std::vector<PP_VideoConfigElement>* out_configs);
+
+ protected:
+  void SetFlushCallback(PP_CompletionCallback callback);
+  void SetResetCallback(PP_CompletionCallback callback);
+  void SetBitstreamBufferCallback(
+      int32 bitstream_buffer_id, PP_CompletionCallback callback);
+
+  void RunFlushCallback(int32 result);
+  void RunResetCallback(int32 result);
+  void RunBitstreamBufferCallback(int32 bitstream_buffer_id, int32 result);
+
+  // Tell command buffer to process all commands it has received so far.
+  void FlushCommandBuffer();
+
+  // Initialize the underlying decoder and return success status.
+  virtual bool Init(PP_Resource context3d_id,
+                    thunk::PPB_Context3D_API* context,
+                    const PP_VideoConfigElement* dec_config);
+
+  // TODO(fischman/vrk): Remove accordingly when brettw has merged resource
+  // trackers.
+  virtual void AddRefResource(PP_Resource resource) = 0;
+  virtual void UnrefResource(PP_Resource resource) = 0;
+
+ private:
+  // Key: bitstream_buffer_id, value: callback to run when bitstream decode is
+  // done.
+  typedef std::map<int32, PP_CompletionCallback> CallbackById;
+
+  PP_CompletionCallback flush_callback_;
+  PP_CompletionCallback reset_callback_;
+  CallbackById bitstream_buffer_callbacks_;
+
+  // The resource ID of the underlying Context3d object being used.  Used only
+  // for reference counting to keep it alive for the lifetime of |*this|.
+  PP_Resource context3d_id_;
+
+  // Reference to the GLES2Implementation owned by |context3d_id_|.
+  // Context3D is guaranteed to be alive for the lifetime of this class.
+  // In the out-of-process case, Context3D's gles2_impl() exists in the plugin
+  // process only, so gles2_impl_ is NULL in that case.
+  gpu::gles2::GLES2Implementation* gles2_impl_;
+
+  DISALLOW_COPY_AND_ASSIGN(VideoDecoderImpl);
+};
+
+}  // namespace ppapi
+
+#endif  // PPAPI_SHARED_IMPL_VIDEO_DECODER_IMPL_H_