Detect AudioInputStream muting and propagate to MediaStreamAudioSource.

media/audio/audio_input_device.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/audio/audio_input_device.h"
 
 #include <stdint.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 207 matching lines @@
     // object has been deleted.
     // TODO(tommi): Add an explicit contract for clearing the callback
     // object.  Possibly require calling Initialize again or provide
     // a callback object via Start() and clear it in Stop().
     base::AutoLock auto_lock_(audio_thread_lock_);
     if (audio_thread_)
       callback_->OnCaptureError("IPC delegate state error.");
   }
 }
 
+void AudioInputDevice::OnMuted(bool is_muted) {
+  DCHECK(task_runner()->BelongsToCurrentThread());

[Max Morin, 2017/06/02 09:56:05]

I think you have to check |state_| here to ensure you're not accessing
|callback_| after it's freed (like in OnError).

[ossu-chromium, 2017/06/02 10:48:00]

Oh, you're probably right. I'll look into it.

+  callback_->OnCaptureMuted(is_muted);
+}
+
 void AudioInputDevice::OnIPCClosed() {
   DCHECK(task_runner()->BelongsToCurrentThread());
   state_ = IPC_CLOSED;
   ipc_.reset();
 }
 
 AudioInputDevice::~AudioInputDevice() {
 #if DCHECK_IS_ON()
   // Make sure we've stopped the stream properly before destructing |this|.
   DCHECK(audio_thread_lock_.Try());
@@ skipping 190 matching lines @@
   capture_callback_->Capture(
       audio_bus,
       buffer->params.hardware_delay_bytes / bytes_per_ms_,  // Delay in ms
       buffer->params.volume, buffer->params.key_pressed);
 
   if (++current_segment_id_ >= total_segments_)
     current_segment_id_ = 0;
 }
 
 }  // namespace media