Fix DCHECKs in V4l2VideoDevice.

content/common/gpu/media/v4l2_image_processor.cc

 // 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.
 
 #include <fcntl.h>
 #include <linux/videodev2.h>
 #include <poll.h>
 #include <sys/eventfd.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>
@@ skipping 196 matching lines @@
 void V4L2ImageProcessor::DestroyTask() {
   DCHECK_EQ(device_thread_.message_loop(), base::MessageLoop::current());
 
   device_weak_factory_.InvalidateWeakPtrs();
 
   // Stop streaming and the device_poll_thread_.
   StopDevicePoll();
 }
 
 bool V4L2ImageProcessor::CreateInputBuffers() {
+  DVLOG(3) << __func__;

[kcwu, 2014/08/15 10:19:17]

Is this intended for future use or just forgot to remove? (I don't mean to
remove, just make sure your intention)

[wuchengli, 2014/08/18 07:08:13]

This is added intentional. We often want to know if CodedSizeFromV4L2Format is
called by this or other functions.

   DCHECK(child_message_loop_proxy_->BelongsToCurrentThread());
   DCHECK(!input_streamon_);
 
   struct v4l2_control control;
   memset(&control, 0, sizeof(control));
   control.id = V4L2_CID_ROTATE;
   control.value = 0;
   IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_S_CTRL, &control);
 
   memset(&control, 0, sizeof(control));
@@ skipping 50 matching lines @@
   DCHECK(input_buffer_map_.empty());
   input_buffer_map_.resize(reqbufs.count);
 
   for (size_t i = 0; i < input_buffer_map_.size(); ++i)
     free_input_buffers_.push_back(i);
 
   return true;
 }
 
 bool V4L2ImageProcessor::CreateOutputBuffers() {
+  DVLOG(3) << __func__;
   DCHECK(child_message_loop_proxy_->BelongsToCurrentThread());
   DCHECK(!output_streamon_);
 
   struct v4l2_format format;
   memset(&format, 0, sizeof(format));
   format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
   format.fmt.pix_mp.width = output_allocated_size_.width();
   format.fmt.pix_mp.height = output_allocated_size_.height();
   format.fmt.pix_mp.pixelformat = output_format_fourcc_;
   format.fmt.pix_mp.num_planes = output_planes_count_;
@@ skipping 411 matching lines @@
     output_record.at_device = false;
     if (!output_record.at_client)
       free_output_buffers_.push_back(i);
   }
   output_buffer_queued_count_ = 0;
 
   return true;
 }
 
 }  // namespace content