bool WebRtcAudioRenderer::Initialize(WebRtcAudioRendererSource* source) {
  base::AutoLock auto_lock(lock_);
  DCHECK_EQ(state_, UNINITIALIZED);
  DCHECK(source);
  DCHECK(!sink_);
  DCHECK(!source_);

  sink_ = AudioDeviceFactory::NewOutputDevice();
  DCHECK(sink_);

  int sample_rate = GetAudioOutputSampleRate();
  DVLOG(1) << "Audio output hardware sample rate: " << sample_rate;
  UMA_HISTOGRAM_ENUMERATION("WebRTC.AudioOutputSampleRate",
                            sample_rate, media::kUnexpectedAudioSampleRate);

  if (std::find(&kValidOutputRates[0],
                &kValidOutputRates[0] + arraysize(kValidOutputRates),
                sample_rate) ==
                    &kValidOutputRates[arraysize(kValidOutputRates)]) {
    DLOG(ERROR) << sample_rate << " is not a supported output rate.";
    return false;
  }

  media::ChannelLayout channel_layout = media::CHANNEL_LAYOUT_STEREO;

  int buffer_size = 0;

#if defined(OS_WIN)
  channel_layout = media::CHANNEL_LAYOUT_STEREO;


  if (sample_rate == 96000 || sample_rate == 48000) {
    buffer_size = (sample_rate / 100);
  } else {
    buffer_size = 2 * 440;
  }

  if (base::win::GetVersion() < base::win::VERSION_VISTA) {
    buffer_size = 3 * buffer_size;
    DLOG(WARNING) << "Extending the output buffer size by a factor of three "
                  << "since Windows XP has been detected.";
  }
#elif defined(OS_MACOSX)
  channel_layout = media::CHANNEL_LAYOUT_MONO;
 
 
  if (sample_rate == 48000) {
    buffer_size = 480;
   } else {
    buffer_size = 440;
  }
#elif defined(OS_LINUX) || defined(OS_OPENBSD)
  channel_layout = media::CHANNEL_LAYOUT_MONO;

  buffer_size = 480;
#else
  DLOG(ERROR) << "Unsupported platform";
  return false;
#endif

  params_.Reset(media::AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout,
                sample_rate, 16, buffer_size);

  buffer_.reset(new int16[params_.frames_per_buffer() * params_.channels()]);

  source_ = source;
  source->SetRenderFormat(params_);

  sink_->Initialize(params_, this);
  sink_->SetSourceRenderView(source_render_view_id_);
  sink_->Start();

  state_ = PAUSED;

  UMA_HISTOGRAM_ENUMERATION("WebRTC.AudioOutputChannelLayout",
                            channel_layout, media::CHANNEL_LAYOUT_MAX);
  UMA_HISTOGRAM_ENUMERATION("WebRTC.AudioOutputFramesPerBuffer",
                            buffer_size, kUnexpectedAudioBufferSize);
  AddHistogramFramesPerBuffer(buffer_size);

  return true;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.