media/audio/sample_rates.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MEDIA_AUDIO_SAMPLE_RATES_H_
   6 #define MEDIA_AUDIO_SAMPLE_RATES_H_
   7
   8 #include "media/base/media_export.h"
   9
  10 namespace media {
  11
  12 // Enumeration used for histogramming sample rates into distinct buckets.
  13 // Logged to UMA, so never reuse a value, always add new/greater ones!
  14 enum AudioSampleRate {
  15   k8000Hz = 0,
  16   k16000Hz = 1,
  17   k32000Hz = 2,
  18   k48000Hz = 3,
  19   k96000Hz = 4,
  20   k11025Hz = 5,
  21   k22050Hz = 6,
  22   k44100Hz = 7,
  23   k88200Hz = 8,
  24   k176400Hz = 9,
  25   k192000Hz = 10,
  26   // Must always equal the largest value ever reported:
  27   kAudioSampleRateMax = k192000Hz,
  28 };
  29
  30 // Helper method to convert integral values to their respective enum values,
  31 // returns false for unexpected sample rates.
  32 MEDIA_EXPORT bool ToAudioSampleRate(int sample_rate, AudioSampleRate* asr);
  33
  34 }  // namespace media
  35
  36 #endif  // MEDIA_AUDIO_SAMPLE_RATES_H_