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// Copyright (c) 2012 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 "media/audio/linux/alsa_wrapper.h"
#include <alsa/asoundlib.h>
AlsaWrapper::AlsaWrapper() {
}
AlsaWrapper::~AlsaWrapper() {
}
int AlsaWrapper::PcmOpen(snd_pcm_t** handle, const char* name,
snd_pcm_stream_t stream, int mode) {
return snd_pcm_open(handle, name, stream, mode);
}
int AlsaWrapper::DeviceNameHint(int card, const char* iface, void*** hints) {
return snd_device_name_hint(card, iface, hints);
}
char* AlsaWrapper::DeviceNameGetHint(const void* hint, const char* id) {
return snd_device_name_get_hint(hint, id);
}
int AlsaWrapper::DeviceNameFreeHint(void** hints) {
return snd_device_name_free_hint(hints);
}
int AlsaWrapper::CardNext(int* rcard) {
return snd_card_next(rcard);
}
int AlsaWrapper::PcmClose(snd_pcm_t* handle) {
return snd_pcm_close(handle);
}
int AlsaWrapper::PcmPrepare(snd_pcm_t* handle) {
return snd_pcm_prepare(handle);
}
int AlsaWrapper::PcmDrop(snd_pcm_t* handle) {
return snd_pcm_drop(handle);
}
int AlsaWrapper::PcmDelay(snd_pcm_t* handle, snd_pcm_sframes_t* delay) {
return snd_pcm_delay(handle, delay);
}
snd_pcm_sframes_t AlsaWrapper::PcmWritei(snd_pcm_t* handle,
const void* buffer,
snd_pcm_uframes_t size) {
return snd_pcm_writei(handle, buffer, size);
}
snd_pcm_sframes_t AlsaWrapper::PcmReadi(snd_pcm_t* handle,
void* buffer,
snd_pcm_uframes_t size) {
return snd_pcm_readi(handle, buffer, size);
}
int AlsaWrapper::PcmRecover(snd_pcm_t* handle, int err, int silent) {
return snd_pcm_recover(handle, err, silent);
}
const char* AlsaWrapper::PcmName(snd_pcm_t* handle) {
return snd_pcm_name(handle);
}
int AlsaWrapper::ConfigureHwParams(snd_pcm_t* handle,
snd_pcm_hw_params_t* hw_params,
snd_pcm_format_t format,
snd_pcm_access_t access,
unsigned int channels,
unsigned int rate,
int soft_resample,
unsigned int latency) {
int err = 0;
if ((err = snd_pcm_hw_params_any(handle, hw_params)) < 0)
return err;
if ((err = snd_pcm_hw_params_set_rate_resample(handle, hw_params,
soft_resample)) < 0) {
return err;
}
if ((err = snd_pcm_hw_params_set_format(handle, hw_params, format)) < 0)
return err;
int dir = 0;
unsigned new_rate = rate;
if ((err = snd_pcm_hw_params_set_rate_near(handle, hw_params,
&new_rate, &dir)) < 0) {
return err;
}
if ((err = snd_pcm_hw_params_set_access(handle, hw_params, access)) < 0)
return err;
if ((err = snd_pcm_hw_params_set_channels(handle, hw_params, channels)) < 0)
return err;
unsigned buffer_time = latency;
if (buffer_time == 0) {
if ((err = snd_pcm_hw_params_get_buffer_time_max(hw_params,
&buffer_time, 0)) < 0) {
return err;
}
if (buffer_time > 500000)
buffer_time = 500000;
}
unsigned period_time = buffer_time / 4;
if ((err = snd_pcm_hw_params_set_period_time_near(handle, hw_params,
&period_time, 0)) < 0) {
return err;
}
err = snd_pcm_hw_params_set_buffer_time_near(handle, hw_params,
&buffer_time, 0);
return err;
}
int AlsaWrapper::PcmSetParams(snd_pcm_t* handle, snd_pcm_format_t format,
snd_pcm_access_t access, unsigned int channels,
unsigned int rate, int soft_resample,
unsigned int latency) {
int err = 0;
snd_pcm_hw_params_t* hw_params;
if ((err = snd_pcm_hw_params_malloc(&hw_params)) < 0)
return err;
if ((err = ConfigureHwParams(handle, hw_params, format, access, channels,
rate, soft_resample, latency)) >= 0) {
err = snd_pcm_hw_params(handle, hw_params);
}
snd_pcm_hw_params_free(hw_params);
return err;
}
int AlsaWrapper::PcmGetParams(snd_pcm_t* handle, snd_pcm_uframes_t* buffer_size,
snd_pcm_uframes_t* period_size) {
return snd_pcm_get_params(handle, buffer_size, period_size);
}
snd_pcm_sframes_t AlsaWrapper::PcmAvailUpdate(snd_pcm_t* handle) {
return snd_pcm_avail_update(handle);
}
snd_pcm_state_t AlsaWrapper::PcmState(snd_pcm_t* handle) {
return snd_pcm_state(handle);
}
const char* AlsaWrapper::StrError(int errnum) {
return snd_strerror(errnum);
}
int AlsaWrapper::PcmStart(snd_pcm_t* handle) {
return snd_pcm_start(handle);
}
int AlsaWrapper::MixerOpen(snd_mixer_t** mixer, int mode) {
return snd_mixer_open(mixer, mode);
}
int AlsaWrapper::MixerAttach(snd_mixer_t* mixer, const char* name) {
return snd_mixer_attach(mixer, name);
}
int AlsaWrapper::MixerElementRegister(snd_mixer_t* mixer,
struct snd_mixer_selem_regopt* options,
snd_mixer_class_t** classp) {
return snd_mixer_selem_register(mixer, options, classp);
}
void AlsaWrapper::MixerFree(snd_mixer_t* mixer) {
snd_mixer_free(mixer);
}
int AlsaWrapper::MixerDetach(snd_mixer_t* mixer, const char* name) {
return snd_mixer_detach(mixer, name);
}
int AlsaWrapper::MixerClose(snd_mixer_t* mixer) {
return snd_mixer_close(mixer);
}
int AlsaWrapper::MixerLoad(snd_mixer_t* mixer) {
return snd_mixer_load(mixer);
}
snd_mixer_elem_t* AlsaWrapper::MixerFirstElem(snd_mixer_t* mixer) {
return snd_mixer_first_elem(mixer);
}
snd_mixer_elem_t* AlsaWrapper::MixerNextElem(snd_mixer_elem_t* elem) {
return snd_mixer_elem_next(elem);
}
int AlsaWrapper::MixerSelemIsActive(snd_mixer_elem_t* elem) {
return snd_mixer_selem_is_active(elem);
}
const char* AlsaWrapper::MixerSelemName(snd_mixer_elem_t* elem) {
return snd_mixer_selem_get_name(elem);
}
int AlsaWrapper::MixerSelemSetCaptureVolumeAll(
snd_mixer_elem_t* elem, long value) {
return snd_mixer_selem_set_capture_volume_all(elem, value);
}
int AlsaWrapper::MixerSelemGetCaptureVolume(
snd_mixer_elem_t* elem, snd_mixer_selem_channel_id_t channel, long* value) {
return snd_mixer_selem_get_capture_volume(elem, channel, value);
}
int AlsaWrapper::MixerSelemHasCaptureVolume(snd_mixer_elem_t* elem) {
return snd_mixer_selem_has_capture_volume(elem);
}
int AlsaWrapper::MixerSelemGetCaptureVolumeRange(snd_mixer_elem_t* elem,
long* min, long* max) {
return snd_mixer_selem_get_capture_volume_range(elem, min, max);
}
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