Allow media track switching.

media/filters/ffmpeg_demuxer.cc

 // Copyright (c) 2012 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/filters/ffmpeg_demuxer.h"
 
 #include <algorithm>
 #include <memory>
 #include <set>
 #include <utility>
@@ skipping 1314 matching lines @@
     // Some metadata is named differently in FFmpeg for webm files.
     if (strstr(format_context->iformat->name, "webm") ||
         strstr(format_context->iformat->name, "matroska")) {
       // TODO(servolk): FFmpeg doesn't set stream->id correctly for webm files.
       // Need to fix that and use it as track id. crbug.com/323183
       track_id =
           static_cast<StreamParser::TrackId>(media_tracks->tracks().size() + 1);
       track_label = streams_[i]->GetMetadata("title");
     }
 
+    if (codec_type == AVMEDIA_TYPE_AUDIO) {
+      streams_[i]->set_enabled(detected_audio_track_count == 1,
+                               base::TimeDelta());
+    } else if (codec_type == AVMEDIA_TYPE_VIDEO) {
+      streams_[i]->set_enabled(detected_video_track_count == 1,
+                               base::TimeDelta());
+    }
+
     if ((codec_type == AVMEDIA_TYPE_AUDIO &&
          media_tracks->getAudioConfig(track_id).IsValidConfig()) ||
         (codec_type == AVMEDIA_TYPE_VIDEO &&
          media_tracks->getVideoConfig(track_id).IsValidConfig())) {
       MEDIA_LOG(INFO, media_log_)
           << GetDisplayName()
           << ": skipping duplicate media stream id=" << track_id;
       continue;
     }
 
@@ skipping 298 matching lines @@
 void FFmpegDemuxer::OnEnabledAudioTracksChanged(
     const std::vector<MediaTrack::Id>& track_ids,
     base::TimeDelta curr_time) {
   DCHECK(task_runner_->BelongsToCurrentThread());
 
   std::set<FFmpegDemuxerStream*> enabled_streams;
   for (const auto& id : track_ids) {
     FFmpegDemuxerStream* stream = track_id_to_demux_stream_map_[id];
     DCHECK(stream);
     DCHECK_EQ(DemuxerStream::AUDIO, stream->type());
+    // TODO(servolk): Remove after multiple enabled audio tracks are supported
+    // by the media::RendererImpl.
+    if (!enabled_streams.empty()) {
+      MEDIA_LOG(INFO, media_log_)
+          << "Only one enabled audio track is supported, ignoring track " << id;
+      continue;
+    }
     enabled_streams.insert(stream);
   }
 
   // First disable all streams that need to be disabled and then enable streams
   // that are enabled.
   for (const auto& stream : streams_) {
     if (stream && stream->type() == DemuxerStream::AUDIO &&
         enabled_streams.find(stream.get()) == enabled_streams.end()) {
       DVLOG(1) << __func__ << ": disabling stream " << stream.get();
       stream->set_enabled(false, curr_time);
@@ skipping 176 matching lines @@
 
 void FFmpegDemuxer::SetLiveness(DemuxerStream::Liveness liveness) {
   DCHECK(task_runner_->BelongsToCurrentThread());
   for (const auto& stream : streams_) {
     if (stream)
       stream->SetLiveness(liveness);
   }
 }
 
 }  // namespace media