WebRTC Unity Plugin Rebase

examples/unityplugin/unity_plugin_apis.h

 /*
  *  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.
  */
 
 // This file provides an example of unity native plugin APIs.
 
 #ifndef EXAMPLES_UNITYPLUGIN_UNITY_PLUGIN_APIS_H_
 #define EXAMPLES_UNITYPLUGIN_UNITY_PLUGIN_APIS_H_
 
 #include <stdint.h>
 
 // Definitions of callback functions.
+// To support alpha channel, one needs to patch
+// https://codereview.chromium.org/2951033003/. We put it in general
+// interface in order to make this plugin work well with our Unity
+// Demo even without the Alpha Support.
 typedef void (*I420FRAMEREADY_CALLBACK)(const uint8_t* data_y,
                                         const uint8_t* data_u,
                                         const uint8_t* data_v,
+                                        const uint8_t* data_a,
                                         int stride_y,
                                         int stride_u,
                                         int stride_v,
+                                        int stride_a,
                                         uint32_t width,
                                         uint32_t height);
 typedef void (*LOCALDATACHANNELREADY_CALLBACK)();
 typedef void (*DATAFROMEDATECHANNELREADY_CALLBACK)(const char* msg);
 typedef void (*FAILURE_CALLBACK)(const char* msg);
 typedef void (*LOCALSDPREADYTOSEND_CALLBACK)(const char* type, const char* sdp);
 typedef void (*ICECANDIDATEREADYTOSEND_CALLBACK)(const char* candidate,
                                                  const int sdp_mline_index,
                                                  const char* sdp_mid);
 typedef void (*AUDIOBUSREADY_CALLBACK)(const void* audio_data,
@@ skipping 61 matching lines @@
                                                AUDIOBUSREADY_CALLBACK callback);
 WEBRTC_PLUGIN_API bool RegisterOnLocalSdpReadytoSend(
     int peer_connection_id,
     LOCALSDPREADYTOSEND_CALLBACK callback);
 WEBRTC_PLUGIN_API bool RegisterOnIceCandiateReadytoSend(
     int peer_connection_id,
     ICECANDIDATEREADYTOSEND_CALLBACK callback);
 }
 
 #endif  // EXAMPLES_UNITYPLUGIN_UNITY_PLUGIN_APIS_H_