From c75972f54a136eda05ab7cd87966526e026edc5a Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Thu, 16 Feb 2006 22:08:06 +0000 Subject: move alsa-util.[ch], oss-util.[ch] and howl-wrap.[ch] to the modules directory since they are just helper source used exclusively by the modules git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@489 fefdeb5f-60dc-0310-8127-8f9354f1896f --- src/modules/alsa-util.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 125 insertions(+) create mode 100644 src/modules/alsa-util.c (limited to 'src/modules/alsa-util.c') diff --git a/src/modules/alsa-util.c b/src/modules/alsa-util.c new file mode 100644 index 00000000..8318f945 --- /dev/null +++ b/src/modules/alsa-util.c @@ -0,0 +1,125 @@ +/* $Id$ */ + +/*** + This file is part of polypaudio. + + polypaudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as published + by the Free Software Foundation; either version 2 of the License, + or (at your option) any later version. + + polypaudio is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with polypaudio; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + +#ifdef HAVE_CONFIG_H +#include +#endif + +#include +#include + +#include +#include +#include + +#include "alsa-util.h" + +/* Set the hardware parameters of the given ALSA device. Returns the + * selected fragment settings in *period and *period_size */ +int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, const pa_sample_spec *ss, uint32_t *periods, snd_pcm_uframes_t *period_size) { + int ret = -1; + snd_pcm_uframes_t buffer_size; + snd_pcm_hw_params_t *hwparams = NULL; + static const snd_pcm_format_t format_trans[] = { + [PA_SAMPLE_U8] = SND_PCM_FORMAT_U8, + [PA_SAMPLE_ALAW] = SND_PCM_FORMAT_A_LAW, + [PA_SAMPLE_ULAW] = SND_PCM_FORMAT_MU_LAW, + [PA_SAMPLE_S16LE] = SND_PCM_FORMAT_S16_LE, + [PA_SAMPLE_S16BE] = SND_PCM_FORMAT_S16_BE, + [PA_SAMPLE_FLOAT32LE] = SND_PCM_FORMAT_FLOAT_LE, + [PA_SAMPLE_FLOAT32BE] = SND_PCM_FORMAT_FLOAT_BE, + }; + assert(pcm_handle && ss && periods && period_size); + + if (snd_pcm_hw_params_malloc(&hwparams) < 0 || + snd_pcm_hw_params_any(pcm_handle, hwparams) < 0 || + snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED) < 0 || + snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[ss->format]) < 0 || + snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &ss->rate, NULL) < 0 || + snd_pcm_hw_params_set_channels(pcm_handle, hwparams, ss->channels) < 0 || + (*periods > 0 && snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, periods, NULL) < 0) || + (*period_size > 0 && snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, period_size, NULL) < 0) || + snd_pcm_hw_params(pcm_handle, hwparams) < 0) + goto finish; + + if (snd_pcm_prepare(pcm_handle) < 0) + goto finish; + + if (snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size) < 0 || + snd_pcm_hw_params_get_period_size(hwparams, period_size, NULL) < 0) + goto finish; + + assert(buffer_size > 0); + assert(*period_size > 0); + *periods = buffer_size / *period_size; + assert(*periods > 0); + + ret = 0; + +finish: + if (hwparams) + snd_pcm_hw_params_free(hwparams); + + return ret; +} + +/* Allocate an IO event for every ALSA poll descriptor for the + * specified ALSA device. Return a pointer to such an array in + * *io_events. Store the length of that array in *n_io_events. Use the + * specified callback function and userdata. The array has to be freed + * with pa_free_io_events(). */ +int pa_create_io_events(snd_pcm_t *pcm_handle, pa_mainloop_api* m, pa_io_event ***io_events, unsigned *n_io_events, void (*cb)(pa_mainloop_api*a, pa_io_event *e, int fd, pa_io_event_flags_t events, void *userdata), void *userdata) { + unsigned i; + struct pollfd *pfds, *ppfd; + pa_io_event **ios; + assert(pcm_handle && m && io_events && n_io_events && cb); + + *n_io_events = snd_pcm_poll_descriptors_count(pcm_handle); + + pfds = pa_xmalloc(sizeof(struct pollfd) * *n_io_events); + if (snd_pcm_poll_descriptors(pcm_handle, pfds, *n_io_events) < 0) { + pa_xfree(pfds); + return -1; + } + + *io_events = pa_xmalloc(sizeof(void*) * *n_io_events); + + for (i = 0, ios = *io_events, ppfd = pfds; i < *n_io_events; i++, ios++, ppfd++) { + *ios = m->io_new(m, ppfd->fd, + ((ppfd->events & POLLIN) ? PA_IO_EVENT_INPUT : 0) | + ((ppfd->events & POLLOUT) ? PA_IO_EVENT_OUTPUT : 0), cb, userdata); + assert(*ios); + } + + pa_xfree(pfds); + return 0; +} + +/* Free the memory allocated by pa_create_io_events() */ +void pa_free_io_events(pa_mainloop_api* m, pa_io_event **io_events, unsigned n_io_events) { + unsigned i; + pa_io_event **ios; + assert(m && io_events); + + for (ios = io_events, i = 0; i < n_io_events; i++, ios++) + m->io_free(*ios); + pa_xfree(io_events); +} -- cgit