MJPEG acceleration for video capture using VAAPI

content/common/gpu/client/gpu_channel_host.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_CLIENT_GPU_CHANNEL_HOST_H_
 #define CONTENT_COMMON_GPU_CLIENT_GPU_CHANNEL_HOST_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 26 matching lines @@
 class MessageLoop;
 class MessageLoopProxy;
 class WaitableEvent;
 }
 
 namespace IPC {
 class SyncMessageFilter;
 }
 
 namespace media {
+class JpegDecodeAccelerator;
 class VideoDecodeAccelerator;
 class VideoEncodeAccelerator;
 }
 
 namespace gpu {
 class GpuMemoryBufferManager;
 }
 
 namespace content {
 class CommandBufferProxyImpl;
 class GpuChannelHost;
+class GpuJpegDecodeAcceleratorHost;
 
 struct GpuListenerInfo {
   GpuListenerInfo();
   ~GpuListenerInfo();
 
   base::WeakPtr<IPC::Listener> listener;
   scoped_refptr<base::MessageLoopProxy> loop;
 };
 
 struct ProxyFlushInfo {
@@ skipping 72 matching lines @@
       const GURL& active_url,
       gfx::GpuPreference gpu_preference);
 
   // Creates a video decoder in the GPU process.
   scoped_ptr<media::VideoDecodeAccelerator> CreateVideoDecoder(
       int command_buffer_route_id);
 
   // Creates a video encoder in the GPU process.
   scoped_ptr<media::VideoEncodeAccelerator> CreateVideoEncoder(
       int command_buffer_route_id);
 

[wuchengli, 2015/05/06 07:59:18]

// Creates a JPEG decoder in the GPU process.
Also explain what |reply_loop| is.

[kcwu, 2015/05/08 14:42:42]

Acknowledged.
Revised to use jpeg thread and no reply_loop.

+  scoped_ptr<media::JpegDecodeAccelerator> CreateJpegDecoder(
+      scoped_refptr<base::MessageLoopProxy> reply_loop);
+
   // Destroy a command buffer created by this channel.
   void DestroyCommandBuffer(CommandBufferProxyImpl* command_buffer);
 
   // Destroy this channel.
   void DestroyChannel();
 
   // Add a route for the current message loop.
   void AddRoute(int route_id, base::WeakPtr<IPC::Listener> listener);
   void RemoveRoute(int route_id);
 
@@ skipping 108 matching lines @@
   typedef base::hash_map<int, CommandBufferProxyImpl*> ProxyMap;
   ProxyMap proxies_;
   ProxyFlushInfo flush_info_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannelHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_GPU_CHANNEL_HOST_H_