Introduce a client minimum picture pool size

content/common/gpu/media/vt_video_decode_accelerator.h

 // Copyright 2014 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_VT_VIDEO_DECODE_ACCELERATOR_H_
 #define CONTENT_COMMON_GPU_MEDIA_VT_VIDEO_DECODE_ACCELERATOR_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 20 matching lines @@
 // VideoToolbox.framework implementation of the VideoDecodeAccelerator
 // interface for Mac OS X (currently limited to 10.9+).
 class VTVideoDecodeAccelerator : public media::VideoDecodeAccelerator {
  public:
   explicit VTVideoDecodeAccelerator(
       CGLContextObj cgl_context,
       const base::Callback<bool(void)>& make_context_current);
   ~VTVideoDecodeAccelerator() override;
 
   // VideoDecodeAccelerator implementation.
-  bool Initialize(media::VideoCodecProfile profile, Client* client) override;
+  bool Initialize(media::VideoCodecProfile profile,
+                  uint32 min_picture_count,
+                  Client* client) override;
   void Decode(const media::BitstreamBuffer& bitstream) override;
   void AssignPictureBuffers(
       const std::vector<media::PictureBuffer>& pictures) override;
   void ReusePictureBuffer(int32_t picture_id) override;
   void Flush() override;
   void Reset() override;
   void Destroy() override;
   bool CanDecodeOnIOThread() override;
 
   // Called by OutputThunk() when VideoToolbox finishes decoding a frame.
@@ skipping 109 matching lines @@
   bool SendFrame(const Frame& frame);
 
   //
   // GPU thread state.
   //
   CGLContextObj cgl_context_;
   base::Callback<bool(void)> make_context_current_;
   media::VideoDecodeAccelerator::Client* client_;
   State state_;
 
+  // The number of picture buffers to allocate.
+  uint32_t num_picture_buffers_;
+
   // Queue of pending flush tasks. This is used to drop frames when a reset
   // is pending.
   std::queue<TaskType> pending_flush_tasks_;
 
   // Queue of tasks to complete in the GPU thread.
   std::queue<Task> task_queue_;
 
   // Utility class to define the order of frames in the reorder queue.
   struct FrameOrder {
     bool operator()(
@@ skipping 57 matching lines @@
   // Declared last to ensure that all weak pointers are invalidated before
   // other destructors run.
   base::WeakPtrFactory<VTVideoDecodeAccelerator> weak_this_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VTVideoDecodeAccelerator);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_VT_VIDEO_DECODE_ACCELERATOR_H_