Introduce a client minimum picture pool size

content/common/gpu/media/v4l2_slice_video_decode_accelerator.h

 // Copyright 2015 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_V4L2_SLICE_VIDEO_DECODE_ACCELERATOR_H_
 #define CONTENT_COMMON_GPU_MEDIA_V4L2_SLICE_VIDEO_DECODE_ACCELERATOR_H_
 
 #include <linux/videodev2.h>
 #include <queue>
 #include <vector>
@@ skipping 25 matching lines @@
       const scoped_refptr<V4L2Device>& device,
       EGLDisplay egl_display,
       EGLContext egl_context,
       const base::WeakPtr<Client>& io_client_,
       const base::Callback<bool(void)>& make_context_current,
       const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
   ~V4L2SliceVideoDecodeAccelerator() override;
 
   // media::VideoDecodeAccelerator implementation.
   bool Initialize(media::VideoCodecProfile profile,
+                  uint32 min_picture_count,
                   VideoDecodeAccelerator::Client* client) override;
   void Decode(const media::BitstreamBuffer& bitstream_buffer) override;
   void AssignPictureBuffers(
       const std::vector<media::PictureBuffer>& buffers) override;
   void ReusePictureBuffer(int32 picture_buffer_id) override;
   void Flush() override;
   void Reset() override;
   void Destroy() override;
   bool CanDecodeOnIOThread() override;
 
@@ skipping 263 matching lines @@
   // Output buffers ready to use.
   std::list<int> free_output_buffers_;
   // Mapping of int index to an output buffer record.
   std::vector<OutputRecord> output_buffer_map_;
 
   media::VideoCodecProfile video_profile_;
   uint32_t output_format_fourcc_;
   gfx::Size visible_size_;
   gfx::Size coded_size_;
 
+  // Minimum number of picture buffers to allocate.
+  uint32 min_picture_count_;
+
   struct BitstreamBufferRef;
   // Input queue of stream buffers coming from the client.
   std::queue<linked_ptr<BitstreamBufferRef>> decoder_input_queue_;
   // BitstreamBuffer currently being processed.
   scoped_ptr<BitstreamBufferRef> decoder_current_bitstream_buffer_;
 
   // Queue storing decode surfaces ready to be output as soon as they are
   // decoded. The surfaces must be output in order they are queued.
   std::queue<scoped_refptr<V4L2DecodeSurface>> decoder_display_queue_;
 
@@ skipping 49 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(V4L2SliceVideoDecodeAccelerator);
 };
 
 class V4L2H264Picture;
 class V4L2VP8Picture;
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_V4L2_SLICE_VIDEO_DECODE_ACCELERATOR_H_