accel: enable hardware encoding with videotoolbox on macOS

Change-Id: Icc6a87f62aaf80f867d7dd3ef6927f9940e724a0

src/media/media_encoder.cpp

@@ -564,8 +564,11 @@ MediaEncoder::prepareEncoderContext(AVCodec* outputCodec, bool is_video)
         encoderCtx->max_b_frames = 0;
         encoderCtx->pix_fmt = AV_PIX_FMT_YUV420P;
 #ifdef RING_ACCEL
+// Keep YUV format for macOS
+#if !(defined(__APPLE__) && !TARGET_OS_IOS)
         if (accel_)
             encoderCtx->pix_fmt = accel_->getFormat();
+#endif
 #endif
 
         // Fri Jul 22 11:37:59 EDT 2011:tmatth:XXX: DON'T set this, we want our

src/media/video/accel.cpp

@@ -335,7 +335,7 @@ HardwareAccel::initAPI(bool linkable, AVBufferRef* framesCtx)
         if (linkable && framesCtx)
             link = linkHardware(framesCtx);
         // we don't need frame context for videotoolbox
-        if (format_ == AV_PIX_FMT_VIDEOTOOLBOX || link || initFrame()) {
+        if (hwType_ == AV_HWDEVICE_TYPE_VIDEOTOOLBOX || link || initFrame()) {
             return 0;
         }
     }