Make check for 'opened' consistent across all audio stream implementations of Start() and log an ...

media/audio/mac/audio_low_latency_output_mac.cc

Index: media/audio/mac/audio_low_latency_output_mac.cc
===================================================================
--- media/audio/mac/audio_low_latency_output_mac.cc	(revision 113210)
+++ media/audio/mac/audio_low_latency_output_mac.cc	(working copy)
@@ -175,6 +175,10 @@
 
 void AUAudioOutputStream::Start(AudioSourceCallback* callback) {
   DCHECK(callback);
+  DLOG_IF(ERROR, !output_unit_) << "Must call Open() first";

[henrika (OOO until Aug 14), 2011/12/08 20:30:47]

Can we make the error message also reflect the fact that Open() might have
failed? I mean the user might have called Open() and we log "you have not called
Open()".

[tommi (sloooow) - chröme, 2011/12/08 20:47:02]

good point.  Changed all occurrences to "Open() has not been called
successfully".

+  if (!output_unit_)
+    return;
+
   source_ = callback;
 
   AudioOutputUnitStart(output_unit_);