Implement GetDefaultOutputDeviceID, GetAssociatedOutputDeviceID and ...

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 "base/basictypes.h"
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/threading/thread_restrictions.h"
@@ skipping 273 matching lines @@
   shared_memory_.Map(memory_length_);
 }
 
 void AudioInputDevice::AudioThreadCallback::Process(int pending_data) {
   // The shared memory represents parameters, size of the data buffer and the
   // actual data buffer containing audio data. Map the memory into this
   // structure and parse out parameters and the data area.
   uint8* ptr = static_cast<uint8*>(shared_memory_.memory());
   ptr += current_segment_id_ * segment_length_;
   AudioInputBuffer* buffer = reinterpret_cast<AudioInputBuffer*>(ptr);
-  DCHECK_EQ(buffer->params.size,
+  // Usually this will be equal but in the case of low sample rate (e.g. 8kHz,
+  // the buffer may be bigger (on mac at least)).
+  DCHECK_GE(buffer->params.size,
             segment_length_ - sizeof(AudioInputBufferParameters));
   double volume = buffer->params.volume;
   bool key_pressed = buffer->params.key_pressed;
 
   int audio_delay_milliseconds = pending_data / bytes_per_ms_;
   int16* memory = reinterpret_cast<int16*>(&buffer->audio[0]);
   const int bytes_per_sample = sizeof(memory[0]);
 
   if (++current_segment_id_ >= total_segments_)
     current_segment_id_ = 0;
 
   // Deinterleave each channel and convert to 32-bit floating-point
   // with nominal range -1.0 -> +1.0.
   audio_bus_->FromInterleaved(memory, audio_bus_->frames(), bytes_per_sample);
 
   // Deliver captured data to the client in floating point format
   // and update the audio-delay measurement.
   capture_callback_->Capture(
       audio_bus_.get(), audio_delay_milliseconds, volume, key_pressed);
 }
 
 }  // namespace media