media/audio/linux/alsa_util.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_LINUX_ALSA_UTIL_H_
   6 #define MEDIA_AUDIO_LINUX_ALSA_UTIL_H_
   7
   8 #include <alsa/asoundlib.h>
   9 #include <string>
  10
  11 namespace media {
  12 class AlsaWrapper;
  13 }
  14
  15 namespace alsa_util {
  16
  17 snd_pcm_format_t BitsToFormat(int bits_per_sample);
  18
  19 snd_pcm_t* OpenCaptureDevice(media::AlsaWrapper* wrapper,
  20                              const char* device_name,
  21                              int channels,
  22                              int sample_rate,
  23                              snd_pcm_format_t pcm_format,
  24                              int latency_us);
  25
  26 snd_pcm_t* OpenPlaybackDevice(media::AlsaWrapper* wrapper,
  27                               const char* device_name,
  28                               int channels,
  29                               int sample_rate,
  30                               snd_pcm_format_t pcm_format,
  31                               int latency_us);
  32
  33 int CloseDevice(media::AlsaWrapper* wrapper, snd_pcm_t* handle);
  34
  35 snd_mixer_t* OpenMixer(media::AlsaWrapper* wrapper,
  36                        const std::string& device_name);
  37
  38 void CloseMixer(media::AlsaWrapper* wrapper,
  39                 snd_mixer_t* mixer,
  40                 const std::string& device_name);
  41
  42 snd_mixer_elem_t* LoadCaptureMixerElement(media::AlsaWrapper* wrapper,
  43                                           snd_mixer_t* mixer);
  44
  45 }  // namespace alsa_util
  46
  47 #endif  // MEDIA_AUDIO_LINUX_ALSA_UTIL_H_