MJPEG acceleration for video capture using VAAPI

content/common/gpu/client/gpu_channel_host.cc

Index: content/common/gpu/client/gpu_channel_host.cc
diff --git a/content/common/gpu/client/gpu_channel_host.cc b/content/common/gpu/client/gpu_channel_host.cc
index aa47e2fd677bad9d115abb27209433292689fe57..2d96c7d7957db175f962309fe96608fd37dac3a0 100644
--- a/content/common/gpu/client/gpu_channel_host.cc
+++ b/content/common/gpu/client/gpu_channel_host.cc
@@ -13,6 +13,7 @@
 #include "base/threading/thread_restrictions.h"
 #include "base/trace_event/trace_event.h"
 #include "content/common/gpu/client/command_buffer_proxy_impl.h"
+#include "content/common/gpu/client/gpu_jpeg_decode_accelerator_host.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "ipc/ipc_sync_message_filter.h"
 #include "url/gurl.h"
@@ -256,6 +257,21 @@ scoped_ptr<media::VideoEncodeAccelerator> GpuChannelHost::CreateVideoEncoder(
   return it->second->CreateVideoEncoder();
 }
 
+scoped_ptr<media::JpegDecodeAccelerator> GpuChannelHost::CreateJpegDecoder() {

[wuchengli, 2015/04/15 07:11:57]

It looks OK to run CreateJpegDecoder on non-main thread. Let's confirm with
piman when he reviews this.

[kcwu, 2015/04/16 14:38:27]

Acknowledged.

+  TRACE_EVENT0("gpu", "GpuChannelHost::CreateJpegDecoder");
+
+  int32 route_id = GenerateRouteID();
+  GpuJpegDecodeAcceleratorHost* decoder(
+      new GpuJpegDecodeAcceleratorHost(this, route_id));
+
+  scoped_refptr<base::MessageLoopProxy> io_loop = factory_->GetIOLoopProxy();

[wuchengli, 2015/04/15 07:11:57]

Add a comment to explain we want to run VideoFrameReady on IO thread.

[kcwu, 2015/04/16 14:38:27]

Done.

+  io_loop->PostTask(FROM_HERE,
+                    base::Bind(&GpuChannelHost::MessageFilter::AddRoute,
+                               channel_filter_.get(), route_id,
+                               decoder->AsWeakPtr(), io_loop));
+  return scoped_ptr<media::JpegDecodeAccelerator>(decoder);
+}
+
 void GpuChannelHost::DestroyCommandBuffer(
     CommandBufferProxyImpl* command_buffer) {
   TRACE_EVENT0("gpu", "GpuChannelHost::DestroyCommandBuffer");