MediaStreamTrack: Add echo-cancellation and device-id to getSettings

content/renderer/media/webaudio_media_stream_source.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 "content/renderer/media/webaudio_media_stream_source.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 
 namespace content {
 
 WebAudioMediaStreamSource::WebAudioMediaStreamSource(
     blink::WebMediaStreamSource* blink_source)
     : MediaStreamAudioSource(false /* is_remote */),
       is_registered_consumer_(false),
       fifo_(base::Bind(&WebAudioMediaStreamSource::DeliverRebufferedAudio,
                        base::Unretained(this))),
       blink_source_(*blink_source) {
   DVLOG(1) << "WebAudioMediaStreamSource::WebAudioMediaStreamSource()";
 }
 
 WebAudioMediaStreamSource::~WebAudioMediaStreamSource() {
   DVLOG(1) << "WebAudioMediaStreamSource::~WebAudioMediaStreamSource()";
   EnsureSourceIsStopped();
 }
 
+void WebAudioMediaStreamSource::getSettings(
+    blink::WebMediaStreamTrack::Settings& settings) {
+  // This source type does not support echo cancellation.
+  settings.setEchoCancellation(false);
+}
+
 void WebAudioMediaStreamSource::setFormat(size_t number_of_channels,
                                           float sample_rate) {
   DCHECK(thread_checker_.CalledOnValidThread());
   VLOG(1) << "WebAudio media stream source changed format to: channels="
           << number_of_channels << ", sample_rate=" << sample_rate;
 
   // If the channel count is greater than 8, use discrete layout. However,
   // anything beyond 8 is ignored by some audio tracks/sinks.
   media::ChannelLayout channel_layout =
       number_of_channels > 8 ? media::CHANNEL_LAYOUT_DISCRETE
@@ skipping 64 matching lines @@
     int frame_delay) {
   const base::TimeTicks reference_time =
       current_reference_time_ +
       base::TimeDelta::FromMicroseconds(
           frame_delay * base::Time::kMicrosecondsPerSecond /
           MediaStreamAudioSource::GetAudioParameters().sample_rate());
   MediaStreamAudioSource::DeliverDataToTracks(audio_bus, reference_time);
 }
 
 }  // namespace content