Mac Video Capture format change ARGB->YUY2.

Using RGBA implies a colour space conversion in the driver from YUY2 (native capture) to RGBA, which is undone in VideoCaptureController, RGBA to YUV I420. Avoiding this double conversion uses about 5% less CPU in the CMIO thread.

BUG=285967

Review URL: https://chromiumcodereview.appspot.com/23693004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@222250 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/renderer_host/media/video_capture_controller.cc

@@ -322,6 +322,10 @@ void VideoCaptureController::OnIncomingCapturedFrame(
       DCHECK(!chopped_width_ && !chopped_height_);
       origin_colorspace = libyuv::FOURCC_YUY2;
       break;
+    case media::PIXEL_FORMAT_UYVY:
+      DCHECK(!chopped_width_ && !chopped_height_);
+      origin_colorspace = libyuv::FOURCC_UYVY;
+      break;
     case media::PIXEL_FORMAT_RGB24:
       origin_colorspace = libyuv::FOURCC_RAW;
       break;

media/video/capture/mac/video_capture_device_mac.mm

@@ -149,7 +149,7 @@ void VideoCaptureDeviceMac::Allocate(
 
   state_ = kAllocated;
   VideoCaptureCapability current_settings;
-  current_settings.color = PIXEL_FORMAT_ARGB;
+  current_settings.color = PIXEL_FORMAT_UYVY;
   current_settings.width = width;
   current_settings.height = height;
   current_settings.frame_rate = frame_rate;

media/video/capture/mac/video_capture_device_qtkit_mac.mm

@@ -171,7 +171,7 @@
           (id)kCVPixelBufferWidthKey,
           [NSNumber numberWithDouble:frameHeight_],
           (id)kCVPixelBufferHeightKey,
-          [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA],
+          [NSNumber numberWithUnsignedInt:kCVPixelFormatType_422YpCbCr8],
           (id)kCVPixelBufferPixelFormatTypeKey,
           nil];
   [[[captureSession_ outputs] objectAtIndex:0]
@@ -266,7 +266,7 @@
     captureCapability.width = frameWidth_;
     captureCapability.height = frameHeight_;
     captureCapability.frame_rate = frameRate_;
-    captureCapability.color = media::PIXEL_FORMAT_ARGB;
+    captureCapability.color = media::PIXEL_FORMAT_UYVY;
     captureCapability.expected_capture_delay = 0;
     captureCapability.interlaced = false;