Move VideoDecoder::Create() logic to separate internal video decoder factory

webrtc/media/engine/internaldecoderfactory.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_MEDIA_ENGINE_VIDEODECODERSOFTWAREFALLBACKWRAPPER_H_
-#define WEBRTC_MEDIA_ENGINE_VIDEODECODERSOFTWAREFALLBACKWRAPPER_H_
+#ifndef WEBRTC_MEDIA_ENGINE_INTERNALDECODERFACTORY_H_
+#define WEBRTC_MEDIA_ENGINE_INTERNALDECODERFACTORY_H_
 
-#include <memory>
-#include <string>
+#include <vector>
 
-#include "webrtc/video_decoder.h"
+#include "webrtc/media/engine/webrtcvideodecoderfactory.h"
 
-namespace webrtc {
+namespace cricket {
 
-// Class used to wrap external VideoDecoders to provide a fallback option on
-// software decoding when a hardware decoder fails to decode a stream due to
-// hardware restrictions, such as max resolution.
-class VideoDecoderSoftwareFallbackWrapper : public webrtc::VideoDecoder {
+class InternalDecoderFactory : public WebRtcVideoDecoderFactory {
  public:
-  VideoDecoderSoftwareFallbackWrapper(VideoCodecType codec_type,
-                                      VideoDecoder* decoder);
+  InternalDecoderFactory();
+  virtual ~InternalDecoderFactory();
 
-  int32_t InitDecode(const VideoCodec* codec_settings,
-                     int32_t number_of_cores) override;
+  // WebRtcVideoDecoderFactory implementation.
+  webrtc::VideoDecoder* CreateVideoDecoder(
+      webrtc::VideoCodecType type) override;
 
-  int32_t Decode(const EncodedImage& input_image,
-                 bool missing_frames,
-                 const RTPFragmentationHeader* fragmentation,
-                 const CodecSpecificInfo* codec_specific_info,
-                 int64_t render_time_ms) override;
-
-  int32_t RegisterDecodeCompleteCallback(
-      DecodedImageCallback* callback) override;
-
-  int32_t Release() override;
-  bool PrefersLateDecoding() const override;
-
-  const char* ImplementationName() const override;
-
- private:
-  bool InitFallbackDecoder();
-
-  const DecoderType decoder_type_;
-  VideoDecoder* const decoder_;
-
-  VideoCodec codec_settings_;
-  int32_t number_of_cores_;
-  std::string fallback_implementation_name_;
-  std::unique_ptr<VideoDecoder> fallback_decoder_;
-  DecodedImageCallback* callback_;
+  void DestroyVideoDecoder(webrtc::VideoDecoder* decoder) override;
 };
 
-}  // namespace webrtc
+}  // namespace cricket
 
-#endif  // WEBRTC_MEDIA_ENGINE_VIDEODECODERSOFTWAREFALLBACKWRAPPER_H_
+#endif  // WEBRTC_MEDIA_ENGINE_INTERNALDECODERFACTORY_H_