2 files changed, 12 insertions, 4 deletions
diff --git a/media/audio/mac/audio_input_mac.cc b/media/audio/mac/audio_input_mac.cc
index 3f73c2e..eb6f167 100644
--- a/media/audio/mac/audio_input_mac.cc
+++ b/media/audio/mac/audio_input_mac.cc
@@ -21,7 +21,8 @@ PCMQueueInAudioInputStream::PCMQueueInAudioInputStream(
     : manager_(manager),
       callback_(NULL),
       audio_queue_(NULL),
-      buffer_size_bytes_(0) {
+      buffer_size_bytes_(0),
+      started_(false) {
   // We must have a manager.
   DCHECK(manager_);
   // A frame is one sample across all channels. In interleaved audio the per
@@ -68,15 +69,18 @@ void PCMQueueInAudioInputStream::Start(AudioInputCallback* callback) {
     return;
   callback_ = callback;
   OSStatus err = AudioQueueStart(audio_queue_, NULL);
-  if (err != noErr)
+  if (err != noErr) {
     HandleError(err);
-  else
+  } else {
+    started_ = true;
     manager_->IncreaseActiveInputStreamCount();
+  }
 }
 
 void PCMQueueInAudioInputStream::Stop() {
-  if (!audio_queue_)
+  if (!audio_queue_ || !started_)
     return;
+
   // Stop is always called before Close. In case of error, this will be
   // also called when closing the input controller.
   manager_->DecreaseActiveInputStreamCount();
@@ -86,6 +90,8 @@ void PCMQueueInAudioInputStream::Stop() {
   OSStatus err = AudioQueueStop(audio_queue_, true);
   if (err != noErr)
     HandleError(err);
+
+  started_ = false;
 }
 
 void PCMQueueInAudioInputStream::Close() {
diff --git a/media/audio/mac/audio_input_mac.h b/media/audio/mac/audio_input_mac.h
index 7569c36..26be177 100644
--- a/media/audio/mac/audio_input_mac.h
+++ b/media/audio/mac/audio_input_mac.h
@@ -67,6 +67,8 @@ class PCMQueueInAudioInputStream : public AudioInputStream {
   AudioQueueRef audio_queue_;
   // Size of each of the buffers in |audio_buffers_|
   uint32 buffer_size_bytes_;
+  // True iff Start() has been called successfully.
+  bool started_;
 
   DISALLOW_COPY_AND_ASSIGN(PCMQueueInAudioInputStream);
 };