Merge AudioRendererImpl and AudioRendererBase; add NullAudioSink

content/renderer/media/audio_hardware.cc

Index: content/renderer/media/audio_hardware.cc
diff --git a/content/renderer/media/audio_hardware.cc b/content/renderer/media/audio_hardware.cc
index d753a54477df1f8e5cb263f8a264210393c15414..a7322a0f7456b5447dc6c0fb4e00270485ec23fd 100644
--- a/content/renderer/media/audio_hardware.cc
+++ b/content/renderer/media/audio_hardware.cc
@@ -48,36 +48,6 @@ size_t GetOutputBufferSize() {
   return output_buffer_size;
 }
 
-size_t GetHighLatencyOutputBufferSize(int sample_rate) {
-  // TODO(vrk/crogers): The buffer sizes that this function computes is probably
-  // overly conservative. However, reducing the buffer size to 2048-8192 bytes
-  // caused crbug.com/108396. This computation should be revisited while making
-  // sure crbug.com/108396 doesn't happen again.
-
-  // The minimum number of samples in a hardware packet.
-  // This value is selected so that we can handle down to 5khz sample rate.
-  static const size_t kMinSamplesPerHardwarePacket = 1024;
-
-  // The maximum number of samples in a hardware packet.
-  // This value is selected so that we can handle up to 192khz sample rate.
-  static const size_t kMaxSamplesPerHardwarePacket = 64 * 1024;
-
-  // This constant governs the hardware audio buffer size, this value should be
-  // chosen carefully.
-  // This value is selected so that we have 8192 samples for 48khz streams.
-  static const size_t kMillisecondsPerHardwarePacket = 170;
-
-  // Select the number of samples that can provide at least
-  // |kMillisecondsPerHardwarePacket| worth of audio data.
-  size_t samples = kMinSamplesPerHardwarePacket;
-  while (samples <= kMaxSamplesPerHardwarePacket &&
-         samples * base::Time::kMillisecondsPerSecond <
-         sample_rate * kMillisecondsPerHardwarePacket) {
-    samples *= 2;
-  }
-  return samples;
-}
-
 ChannelLayout GetInputChannelLayout() {
   DCHECK(RenderThreadImpl::current() != NULL);