ed52d5a211
Instead of holding SPEC-variable dependent files and directories inline within the repository structure, move them into 'spec' subdirectories at the corresponding levels, e.g.: repos/base/include/spec repos/base/mk/spec repos/base/lib/mk/spec repos/base/src/core/spec ... Moreover, this commit removes the 'platform' directories. That term was used in an overloaded sense. All SPEC-relative 'platform' directories are now named 'spec'. Other files, like for instance those related to the kernel/architecture specific startup library, where moved from 'platform' directories to explicit, more meaningful places like e.g.: 'src/lib/startup'. Fix #1673
89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
/*
|
|
* \brief ALSA-based audio for Linux
|
|
* \author Sebastian Sumpf
|
|
* \author Christian Helmuth
|
|
* \date 2009-12-04
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2009-2013 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#include <alsa/asoundlib.h>
|
|
|
|
#include "alsa.h"
|
|
|
|
static snd_pcm_t *playback_handle;
|
|
|
|
int audio_drv_init(void)
|
|
{
|
|
unsigned int rate = 44100;
|
|
int err;
|
|
snd_pcm_hw_params_t *hw_params;
|
|
|
|
if ((err = snd_pcm_open(&playback_handle, "hw", SND_PCM_STREAM_PLAYBACK, 0)) < 0)
|
|
return -1;
|
|
|
|
if ((err = snd_pcm_hw_params_malloc(&hw_params)) < 0)
|
|
return -2;
|
|
|
|
if ((err = snd_pcm_hw_params_any(playback_handle, hw_params)) < 0)
|
|
return -3;
|
|
|
|
if ((err = snd_pcm_hw_params_set_access(playback_handle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
|
|
return -4;
|
|
|
|
if ((err = snd_pcm_hw_params_set_format(playback_handle, hw_params, SND_PCM_FORMAT_S16_LE)) < 0)
|
|
return -5;
|
|
|
|
if ((err = snd_pcm_hw_params_set_rate(playback_handle, hw_params, rate, 0)) < 0)
|
|
return -6;
|
|
|
|
if ((err = snd_pcm_hw_params_set_channels(playback_handle, hw_params, 2)) < 0)
|
|
return -7;
|
|
|
|
if ((err = snd_pcm_hw_params_set_period_size(playback_handle, hw_params, 2048, 0)) < 0)
|
|
return -8;
|
|
|
|
if ((err = snd_pcm_hw_params_set_periods(playback_handle, hw_params, 4, 0)) < 0)
|
|
return -9;
|
|
|
|
if ((err = snd_pcm_hw_params(playback_handle, hw_params)) < 0)
|
|
return -10;
|
|
|
|
snd_pcm_hw_params_free(hw_params);
|
|
|
|
if ((err = snd_pcm_prepare(playback_handle)) < 0)
|
|
return -11;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void audio_drv_adopt_myself() { }
|
|
|
|
|
|
int audio_drv_play(void *data, int frame_cnt)
|
|
{
|
|
int err;
|
|
if ((err = snd_pcm_writei(playback_handle, data, frame_cnt)) != frame_cnt)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void audio_drv_stop(void)
|
|
{
|
|
snd_pcm_drop(playback_handle);
|
|
}
|
|
|
|
|
|
void audio_drv_start(void)
|
|
{
|
|
snd_pcm_prepare(playback_handle);
|
|
}
|