Add new video codec factories

webrtc/api/video_codecs/video_decoder_factory.h

Index: webrtc/api/video_codecs/video_decoder_factory.h
diff --git a/webrtc/api/video_codecs/video_decoder_factory.h b/webrtc/api/video_codecs/video_decoder_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..2a442075a68064c24d25c6d68586544d962f9b40
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+/*
+ *  Copyright (c) 2017 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_API_VIDEO_CODECS_VIDEO_DECODER_FACTORY_H_
+#define WEBRTC_API_VIDEO_CODECS_VIDEO_DECODER_FACTORY_H_
+
+#include <memory>
+#include <vector>
+
+namespace webrtc {
+
+class VideoDecoder;
+struct SdpVideoFormat;
+
+// A factory that creates VideoDecoders.
+// NOTE: This class is still under development and may change without notice.
+class VideoDecoderFactory {
+ public:
+  // Returns a list of supported video formats in order of preference, to use
+  // for signaling etc.
+  virtual std::vector<SdpVideoFormat> GetSupportedFormats() const = 0;
+
+  // Creates a VideoDecoder for the specified format.
+  virtual std::unique_ptr<VideoDecoder> CreateVideoDecoder(
+      const SdpVideoFormat& format) = 0;
+
+  virtual ~VideoDecoderFactory() {}
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_API_VIDEO_CODECS_VIDEO_DECODER_FACTORY_H_