7 files changed, 19 insertions, 8 deletions
diff --git a/media/audio/mac/audio_input_mac.cc b/media/audio/mac/audio_input_mac.cc
index c59eb61..3f73c2e 100644
--- a/media/audio/mac/audio_input_mac.cc
+++ b/media/audio/mac/audio_input_mac.cc
@@ -63,8 +63,8 @@ bool PCMQueueInAudioInputStream::Open() {
 
 void PCMQueueInAudioInputStream::Start(AudioInputCallback* callback) {
   DCHECK(callback);
-  DCHECK(audio_queue_) << "Must call Open() first";
-  if (callback_)
+  DLOG_IF(ERROR, !audio_queue_) << "Open() has not been called successfully";
+  if (callback_ || !audio_queue_)
     return;
   callback_ = callback;
   OSStatus err = AudioQueueStart(audio_queue_, NULL);
diff --git a/media/audio/mac/audio_low_latency_input_mac.cc b/media/audio/mac/audio_low_latency_input_mac.cc
index 00236fa..bd534e1 100644
--- a/media/audio/mac/audio_low_latency_input_mac.cc
+++ b/media/audio/mac/audio_low_latency_input_mac.cc
@@ -215,7 +215,8 @@ bool AUAudioInputStream::Open() {
 
 void AUAudioInputStream::Start(AudioInputCallback* callback) {
   DCHECK(callback);
-  if (started_)
+  DLOG_IF(ERROR, !audio_unit_) << "Open() has not been called successfully";
+  if (started_ || !audio_unit_)
     return;
   sink_ = callback;
   OSStatus result = AudioOutputUnitStart(audio_unit_);
diff --git a/media/audio/mac/audio_low_latency_output_mac.cc b/media/audio/mac/audio_low_latency_output_mac.cc
index 259e240..a304c64 100644
--- a/media/audio/mac/audio_low_latency_output_mac.cc
+++ b/media/audio/mac/audio_low_latency_output_mac.cc
@@ -175,6 +175,10 @@ void AUAudioOutputStream::Close() {
 
 void AUAudioOutputStream::Start(AudioSourceCallback* callback) {
   DCHECK(callback);
+  DLOG_IF(ERROR, !output_unit_) << "Open() has not been called successfully";
+  if (!output_unit_)
+    return;
+
   source_ = callback;
 
   AudioOutputUnitStart(output_unit_);
diff --git a/media/audio/mac/audio_output_mac.cc b/media/audio/mac/audio_output_mac.cc
index 7fbed99..c230373 100644
--- a/media/audio/mac/audio_output_mac.cc
+++ b/media/audio/mac/audio_output_mac.cc
@@ -479,6 +479,10 @@ void PCMQueueOutAudioOutputStream::RenderCallback(void* p_this,
 
 void PCMQueueOutAudioOutputStream::Start(AudioSourceCallback* callback) {
   DCHECK(callback);
+  DLOG_IF(ERROR, !audio_queue_) << "Open() has not been called successfully";
+  if (!audio_queue_)
+    return;
+
   OSStatus err = noErr;
   SetSource(callback);
   pending_bytes_ = 0;
diff --git a/media/audio/pulse/pulse_output.cc b/media/audio/pulse/pulse_output.cc
index 5010a9e..5b55509 100644
--- a/media/audio/pulse/pulse_output.cc
+++ b/media/audio/pulse/pulse_output.cc
@@ -383,8 +383,12 @@ void PulseAudioOutputStream::WriteToStream(size_t bytes_to_write,
 
 void PulseAudioOutputStream::Start(AudioSourceCallback* callback) {
   DCHECK_EQ(message_loop_, MessageLoop::current());
-
   CHECK(callback);
+  DLOG_IF(ERROR, !playback_handle_)
+      << "Open() has not been called successfully";
+  if (!playback_handle_)
+    return;
+
   source_callback_ = callback;
 
   // Clear buffer, it might still have data in it.
diff --git a/media/audio/win/audio_low_latency_input_win.cc b/media/audio/win/audio_low_latency_input_win.cc
index fc6630b..c6bb0ed 100644
--- a/media/audio/win/audio_low_latency_input_win.cc
+++ b/media/audio/win/audio_low_latency_input_win.cc
@@ -121,8 +121,7 @@ bool WASAPIAudioInputStream::Open() {
 
 void WASAPIAudioInputStream::Start(AudioInputCallback* callback) {
   DCHECK(callback);
-  DCHECK(opened_);
-
+  DLOG_IF(ERROR, !opened_) << "Open() has not been called successfully";
   if (!opened_)
     return;
 
diff --git a/media/audio/win/audio_low_latency_output_win.cc b/media/audio/win/audio_low_latency_output_win.cc
index dc9c6ec..b036b94 100644
--- a/media/audio/win/audio_low_latency_output_win.cc
+++ b/media/audio/win/audio_low_latency_output_win.cc
@@ -117,8 +117,7 @@ bool WASAPIAudioOutputStream::Open() {
 void WASAPIAudioOutputStream::Start(AudioSourceCallback* callback) {
   DCHECK_EQ(GetCurrentThreadId(), creating_thread_id_);
   DCHECK(callback);
-  DCHECK(opened_);
-
+  DLOG_IF(ERROR, !opened_) << "Open() has not been called successfully";
   if (!opened_)
     return;