Use larger buffer sizes for lower power on Linux.

media/base/audio_hardware_config_unittest.cc

 // Copyright (c) 2013 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 "build/build_config.h"
 #include "media/base/audio_hardware_config.h"
 #include "media/audio/audio_parameters.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace media {
 
 static const int kOutputBufferSize = 2048;
 static const int kOutputSampleRate = 48000;
 static const ChannelLayout kOutputChannelLayout = CHANNEL_LAYOUT_STEREO;
 static const int kInputSampleRate = 44100;
@@ skipping 65 matching lines @@
       AudioParameters::AUDIO_PCM_LOW_LATENCY,
       kNewInputChannelLayout,
       kNewInputSampleRate,
       16,
       kOutputBufferSize);
   fake_config.UpdateInputConfig(new_input_params);
   EXPECT_EQ(kNewInputSampleRate, fake_config.GetInputSampleRate());
   EXPECT_EQ(kNewInputChannelLayout, fake_config.GetInputChannelLayout());
 }
 
+TEST(AudioHardwareConfig, HighLatencyBufferSizes) {
+  AudioParameters input_params(AudioParameters::AUDIO_PCM_LOW_LATENCY,
+                               kInputChannelLayout,
+                               kInputSampleRate,
+                               16,
+                               kOutputBufferSize);
+  AudioParameters output_params(AudioParameters::AUDIO_PCM_LOW_LATENCY,
+                                kOutputChannelLayout,
+                                3200,
+                                16,
+                                32);
+  AudioHardwareConfig fake_config(input_params, output_params);
+
+#if defined(OS_LINUX)
+  EXPECT_EQ(64, fake_config.GetHighLatencyBufferSize());
+
+  for (int i = 6400; i <= 204800; i *= 2) {
+    fake_config.UpdateOutputConfig(
+        AudioParameters(AudioParameters::AUDIO_PCM_LOW_LATENCY,
+                        kOutputChannelLayout,
+                        i,
+                        16,
+                        32));
+    EXPECT_EQ(2 * (i / 100), fake_config.GetHighLatencyBufferSize());
+  }
+#else
+  // If high latency buffer sizes are not supported, the value should just pass
+  // through the output buffer size.
+  EXPECT_EQ(32, fake_config.GetHighLatencyBufferSize());
+#endif
+}
+
 }  // namespace content