Revert "Exynos decoder: workaround for wrong MFC output format."

content/common/gpu/media/exynos_video_decode_accelerator.cc

Index: content/common/gpu/media/exynos_video_decode_accelerator.cc
diff --git a/content/common/gpu/media/exynos_video_decode_accelerator.cc b/content/common/gpu/media/exynos_video_decode_accelerator.cc
index d18477718cd0400ab09b580999141b44f01572c1..d6646d14219ceb2d538a0b9e19fed7fc7b22bc74 100644
--- a/content/common/gpu/media/exynos_video_decode_accelerator.cc
+++ b/content/common/gpu/media/exynos_video_decode_accelerator.cc
@@ -398,12 +398,10 @@ bool ExynosVideoDecodeAccelerator::Initialize(
     return false;
 
   // MFC output format has to be setup before streaming starts.
-  // TODO(hshi): set format back to tiled (V4L2_PIX_FMT_NV12MT_16X16) when we
-  // fix the underlying driver/firmware issue. http://crbug.com/303300.
   struct v4l2_format format;
   memset(&format, 0, sizeof(format));
   format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
-  format.fmt.pix_mp.pixelformat = V4L2_PIX_FMT_NV12M;
+  format.fmt.pix_mp.pixelformat = V4L2_PIX_FMT_NV12MT_16X16;

[Ami GONE FROM CHROMIUM, 2013/10/28 15:03:41]

Does this improve perf? 
(why is NV12MT_16x16 better than NV12M?  IDK)

[sheu, 2013/10/28 17:24:49]

MT16x16 is a tiled format, and NV12M is plain linear.  We get about a 0.8% perf
improvement from this.  (Yes, I tested, and it's outside of run-to-run noise.)

   IOCTL_OR_ERROR_RETURN_FALSE(mfc_fd_, VIDIOC_S_FMT, &format);
 
   // Subscribe to the resolution change event.
@@ -2113,7 +2111,7 @@ bool ExynosVideoDecodeAccelerator::CreateBuffersForFormat(
   mfc_output_buffer_size_[0] = format.fmt.pix_mp.plane_fmt[0].sizeimage;
   mfc_output_buffer_size_[1] = format.fmt.pix_mp.plane_fmt[1].sizeimage;
   mfc_output_buffer_pixelformat_ = format.fmt.pix_mp.pixelformat;
-  DCHECK_EQ(mfc_output_buffer_pixelformat_, V4L2_PIX_FMT_NV12M);
+  DCHECK_EQ(mfc_output_buffer_pixelformat_, V4L2_PIX_FMT_NV12MT_16X16);
   DVLOG(3) << "CreateBuffersForFormat(): new resolution: "
            << frame_buffer_size_.ToString();