Reland of Add a webrtc{en,de}coderfactory implementation for VideoToolbox

webrtc/sdk/objc/Framework/Classes/videotoolboxvideocodecfactory.h

+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ *
+ */
+#ifndef WEBRTC_SDK_OBJC_FRAMEWORK_CLASSES_VIDEOTOOLBOXVIDEOCODECFACTORY_H_
+#define WEBRTC_SDK_OBJC_FRAMEWORK_CLASSES_VIDEOTOOLBOXVIDEOCODECFACTORY_H_
+
+#include "webrtc/media/engine/webrtcvideoencoderfactory.h"
+#include "webrtc/media/engine/webrtcvideodecoderfactory.h"
+
+namespace webrtc {
+
+class VideoToolboxVideoEncoderFactory
+    : public cricket::WebRtcVideoEncoderFactory {
+ public:
+  VideoToolboxVideoEncoderFactory();
+  ~VideoToolboxVideoEncoderFactory();
+
+  // WebRtcVideoEncoderFactory implementation.
+  VideoEncoder* CreateVideoEncoder(const cricket::VideoCodec& codec) override;
+  void DestroyVideoEncoder(VideoEncoder* encoder) override;
+  const std::vector<cricket::VideoCodec>& supported_codecs() const override;
+
+ private:
+  std::vector<cricket::VideoCodec> supported_codecs_;
+};
+
+class VideoToolboxVideoDecoderFactory
+    : public cricket::WebRtcVideoDecoderFactory {
+ public:
+  VideoToolboxVideoDecoderFactory();
+  ~VideoToolboxVideoDecoderFactory();
+
+  // WebRtcVideoDecoderFactory implementation.
+  VideoDecoder* CreateVideoDecoder(VideoCodecType type) override;
+  void DestroyVideoDecoder(VideoDecoder* decoder) override;
+
+ private:
+  std::vector<cricket::VideoCodec> supported_codecs_;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_SDK_OBJC_FRAMEWORK_CLASSES_VIDEOTOOLBOXVIDEOCODECFACTORY_H_