fix sign-compare warning.

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 101 matching lines @@
   if (!input_format_fourcc_ || !output_format_fourcc_) {
     DLOG(ERROR) << "Unrecognized format(s)";
     return false;
   }
 
   input_visible_size_ = input_visible_size;
   output_visible_size_ = output_visible_size;
   output_allocated_size_ = output_allocated_size;
 
   input_planes_count_ = media::VideoFrame::NumPlanes(input_format);
-  DCHECK_LE(input_planes_count_, VIDEO_MAX_PLANES);
+  DCHECK_LE(static_cast<int>(input_planes_count_), VIDEO_MAX_PLANES);

[xhwang, 2014/05/15 00:51:45]

Can you do it the other way by casting VIDEO_MAX_PLANES to size_t?

[yunlian, 2014/05/15 16:34:13]

Done.

   output_planes_count_ = media::VideoFrame::NumPlanes(output_format);
-  DCHECK_LE(output_planes_count_, VIDEO_MAX_PLANES);
+  DCHECK_LE(static_cast<int>(output_planes_count_), VIDEO_MAX_PLANES);
 
   // Capabilities check.
   struct v4l2_capability caps;
   memset(&caps, 0, sizeof(caps));
   const __u32 kCapsRequired = V4L2_CAP_VIDEO_CAPTURE_MPLANE |
                               V4L2_CAP_VIDEO_OUTPUT_MPLANE | V4L2_CAP_STREAMING;
   IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_QUERYCAP, &caps);
   if ((caps.capabilities & kCapsRequired) != kCapsRequired) {
     DLOG(ERROR) << "Initialize(): ioctl() failed: VIDIOC_QUERYCAP: "
                    "caps check failed: 0x" << std::hex << caps.capabilities;
@@ skipping 573 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