video: use ffmpeg on OSX

Switch to ffmpeg for video processing on OSX.
FFmpeg provides hardware acceleration for video decoding

Change-Id: Ic1136ac7c4f4917c1250a4ea732775c47a6e6c39

contrib/src/ffmpeg/rules.mak

@@ -86,6 +86,8 @@ FFMPEGCONF += \
 		--enable-encoder=tiff \
 		--enable-decoder=tiff
 
+DEPS_ffmpeg = iconv zlib x264 vpx opus speex $(DEPS_vpx)
+
 ifdef HAVE_WIN32
 FFMPEGCONF += \
 	--enable-indev=dshow \
@@ -192,6 +194,8 @@ ifdef HAVE_IOS
 endif
 ifdef HAVE_MACOSX
 	$(APPLY) $(SRC)/ffmpeg/clock_gettime.patch
+	$(APPLY) $(SRC)/ffmpeg/0004-add-avfcapture-device.patch
+	$(APPLY) $(SRC)/ffmpeg/0005-add-avfgrab-device.patch
 endif
 	$(MOVE)
 

src/media/video/osxvideo/video_device_impl.mm

@@ -96,8 +96,8 @@ VideoDeviceImpl::getDeviceParams() const
 {
     DeviceParams params;
     params.name = [[avDevice_ localizedName] UTF8String];
-    params.input = "[" + device + "]";
-    params.format = "avfoundation";
+    params.input = device;
+    params.format = "avfcapture";
 
     params.width = current_size_.first;
     params.height = current_size_.second;