Removed CHECK to avoid browser crash for Mac OS X.

media/audio/mac/audio_low_latency_output_mac.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/mac/audio_low_latency_output_mac.h"
 
 #include <CoreServices/CoreServices.h>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
@@ skipping 238 matching lines @@
 
   AudioBuffer& buffer = io_data->mBuffers[0];
   uint8* audio_data = reinterpret_cast<uint8*>(buffer.mData);
   uint32 hardware_pending_bytes = static_cast<uint32>
       ((playout_latency_frames + 0.5) * format_.mBytesPerFrame);
 
   // Unfortunately AUAudioInputStream and AUAudioOutputStream share the frame
   // size set by kAudioDevicePropertyBufferFrameSize above on a per process
   // basis.  What this means is that the |number_of_frames| value may be larger
   // or smaller than the value set during Configure().  In this case either
-  // audio input or audio output will be broken.
-  // See http://crbug.com/154352 for details.
-  CHECK_EQ(number_of_frames, static_cast<UInt32>(audio_bus_->frames()));
+  // audio input or audio output will be broken, so just output silence.
+  // TODO(crogers): Figure out what can trigger a change in |number_of_frames|.
+  // See http://crbug.com/1543 for details.
+   if (number_of_frames != static_cast<UInt32>(audio_bus_->frames())) {
+     memset(audio_data, 0, number_of_frames * format_.mBytesPerFrame);
+     return noErr;
+   }
 
   int frames_filled = source_->OnMoreData(
       audio_bus_.get(), AudioBuffersState(0, hardware_pending_bytes));
 
   // Note: If this ever changes to output raw float the data must be clipped and
   // sanitized since it may come from an untrusted source such as NaCl.
   audio_bus_->ToInterleaved(
       frames_filled, format_.mBitsPerChannel / 8, audio_data);
   uint32 filled = frames_filled * format_.mBytesPerFrame;
 
@@ skipping 116 matching lines @@
   UInt64 output_time_ns = AudioConvertHostTimeToNanos(
       output_time_stamp->mHostTime);
   UInt64 now_ns = AudioConvertHostTimeToNanos(AudioGetCurrentHostTime());
   double delay_frames = static_cast<double>
       (1e-9 * (output_time_ns - now_ns) * format_.mSampleRate);
 
   return (delay_frames + hardware_latency_frames_);
 }
 
 }  // namespace media