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- // Copyright 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.
- #ifndef MEDIA_AUDIO_ALSA_ALSA_UTIL_H_
- #define MEDIA_AUDIO_ALSA_ALSA_UTIL_H_
- #include <alsa/asoundlib.h>
- #include <string>
- #include "media/base/media_export.h"
- namespace media {
- class AlsaWrapper;
- }
- namespace alsa_util {
- // When opening ALSA devices, |period_us| is the size of a packet and
- // |buffer_us| is the size of the ring buffer, which consists of multiple
- // packets. In capture devices, the latency relies more on |period_us|, and thus
- // one may require more details upon the value implicitly set by ALSA.
- MEDIA_EXPORT snd_pcm_t* OpenCaptureDevice(media::AlsaWrapper* wrapper,
- const char* device_name,
- int channels,
- int sample_rate,
- snd_pcm_format_t pcm_format,
- int buffer_us,
- int period_us);
- snd_pcm_t* OpenPlaybackDevice(media::AlsaWrapper* wrapper,
- const char* device_name,
- int channels,
- int sample_rate,
- snd_pcm_format_t pcm_format,
- int buffer_us);
- int CloseDevice(media::AlsaWrapper* wrapper, snd_pcm_t* handle);
- snd_mixer_t* OpenMixer(media::AlsaWrapper* wrapper,
- const std::string& device_name);
- void CloseMixer(media::AlsaWrapper* wrapper,
- snd_mixer_t* mixer,
- const std::string& device_name);
- snd_mixer_elem_t* LoadCaptureMixerElement(media::AlsaWrapper* wrapper,
- snd_mixer_t* mixer);
- } // namespace alsa_util
- #endif // MEDIA_AUDIO_ALSA_ALSA_UTIL_H_
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