Reland of Move video_encoder.h and video_decoder.h to /api and create GN targets for them

webrtc/video_decoder.h

 /*
- *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *  DEPRECATED: use api/video_codecs/video_decoder.h instead.
+ *  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_VIDEO_DECODER_H_
 #define WEBRTC_VIDEO_DECODER_H_
 
-#include <memory>
-#include <string>
-#include <vector>
-
-#include "webrtc/common_types.h"
-#include "webrtc/typedefs.h"
-#include "webrtc/video_frame.h"
-
-namespace webrtc {
-
-class RTPFragmentationHeader;
-// TODO(pbos): Expose these through a public (root) header or change these APIs.
-struct CodecSpecificInfo;
-class VideoCodec;
-
-class DecodedImageCallback {
- public:
-  virtual ~DecodedImageCallback() {}
-
-  virtual int32_t Decoded(VideoFrame& decodedImage) = 0;
-  // Provides an alternative interface that allows the decoder to specify the
-  // decode time excluding waiting time for any previous pending frame to
-  // return. This is necessary for breaking positive feedback in the delay
-  // estimation when the decoder has a single output buffer.
-  virtual int32_t Decoded(VideoFrame& decodedImage, int64_t decode_time_ms) {
-    // The default implementation ignores custom decode time value.
-    return Decoded(decodedImage);
-  }
-  // TODO(sakal): Remove other implementations when upstream projects have been
-  // updated.
-  virtual void Decoded(VideoFrame& decodedImage,
-                       rtc::Optional<int32_t> decode_time_ms,
-                       rtc::Optional<uint8_t> qp) {
-    Decoded(decodedImage,
-            decode_time_ms ? static_cast<int32_t>(*decode_time_ms) : -1);
-  }
-
-  virtual int32_t ReceivedDecodedReferenceFrame(const uint64_t pictureId) {
-    return -1;
-  }
-
-  virtual int32_t ReceivedDecodedFrame(const uint64_t pictureId) { return -1; }
-};
-
-class VideoDecoder {
- public:
-  virtual ~VideoDecoder() {}
-
-  virtual int32_t InitDecode(const VideoCodec* codec_settings,
-                             int32_t number_of_cores) = 0;
-
-  virtual int32_t Decode(const EncodedImage& input_image,
-                         bool missing_frames,
-                         const RTPFragmentationHeader* fragmentation,
-                         const CodecSpecificInfo* codec_specific_info = NULL,
-                         int64_t render_time_ms = -1) = 0;
-
-  virtual int32_t RegisterDecodeCompleteCallback(
-      DecodedImageCallback* callback) = 0;
-
-  virtual int32_t Release() = 0;
-
-  // Returns true if the decoder prefer to decode frames late.
-  // That is, it can not decode infinite number of frames before the decoded
-  // frame is consumed.
-  virtual bool PrefersLateDecoding() const { return true; }
-
-  virtual const char* ImplementationName() const { return "unknown"; }
-};
-
-}  // namespace webrtc
+#include "webrtc/api/video_codecs/video_decoder.h"
 
 #endif  // WEBRTC_VIDEO_DECODER_H_