MediaStreamRecorder: enable in Android (including linking libwebm)

media/capture/webm_muxer.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/capture/webm_muxer.h"
 
 #include "base/bind.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/limits.h"
 #include "media/base/video_frame.h"
@@ skipping 27 matching lines @@
   // Set channel mapping.
   if (params.channels() > 2) {
     // Also possible to have a multistream, not supported for now.
     DCHECK_LE(params.channels(), OPUS_MAX_VORBIS_CHANNELS);
     header[OPUS_EXTRADATA_CHANNEL_MAPPING_OFFSET] = 1;
     // Assuming no coupled streams. This should actually be
     // channels() - |coupled_streams|.
     header[OPUS_EXTRADATA_NUM_STREAMS_OFFSET] = params.channels();
     header[OPUS_EXTRADATA_NUM_COUPLED_OFFSET] = 0;
     // Set the actual stream map.
-    memcpy(header + OPUS_EXTRADATA_STREAM_MAP_OFFSET,
-           kOpusVorbisChannelMap[params.channels() - 1], params.channels());
+    for (int i = 0; i < params.channels(); ++i) {
+      header[OPUS_EXTRADATA_STREAM_MAP_OFFSET + i] =
+          kOpusVorbisChannelMap[params.channels() - 1][i];
+    }
   } else {
     header[OPUS_EXTRADATA_CHANNEL_MAPPING_OFFSET] = 0;
   }
 }
 
 static double GetFrameRate(const scoped_refptr<VideoFrame>& video_frame) {
   const double kZeroFrameRate = 0.0;
   const double kDefaultFrameRate = 30.0;
 
   double frame_rate = kDefaultFrameRate;
@@ skipping 185 matching lines @@
 }
 
 void WebmMuxer::ElementStartNotify(mkvmuxer::uint64 element_id,
                                    mkvmuxer::int64 position) {
   // This method gets pinged before items are sent to |write_data_callback_|.
   DCHECK_GE(position, position_.ValueOrDefault(0))
       << "Can't go back in a live WebM stream.";
 }
 
 }  // namespace media