code.delx.au - pulseaudio/blob - src/alsa-util.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <asoundlib.h>
  27
  28 #include "alsa-util.h"
  29 #include "sample.h"
  30
  31 int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, struct pa_sample_spec *ss, uint32_t *periods, snd_pcm_uframes_t *buffer_size) {
  32     int ret = 0;
  33     snd_pcm_hw_params_t *hwparams = NULL;
  34     static const snd_pcm_format_t format_trans[] = {
  35         [PA_SAMPLE_U8] = SND_PCM_FORMAT_U8,
  36         [PA_SAMPLE_ALAW] = SND_PCM_FORMAT_A_LAW,
  37         [PA_SAMPLE_ULAW] = SND_PCM_FORMAT_MU_LAW,
  38         [PA_SAMPLE_S16LE] = SND_PCM_FORMAT_S16_LE,
  39         [PA_SAMPLE_S16BE] = SND_PCM_FORMAT_S16_BE,
  40         [PA_SAMPLE_FLOAT32LE] = SND_PCM_FORMAT_FLOAT_LE,
  41         [PA_SAMPLE_FLOAT32BE] = SND_PCM_FORMAT_FLOAT_BE,
  42     };
  43
  44     if (snd_pcm_hw_params_malloc(&hwparams) < 0 ||
  45         snd_pcm_hw_params_any(pcm_handle, hwparams) < 0 ||
  46         snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED) < 0 ||
  47         snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[ss->format]) < 0 ||
  48         snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &ss->rate, NULL) < 0 ||
  49         snd_pcm_hw_params_set_channels(pcm_handle, hwparams, ss->channels) < 0 ||
  50         snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, periods, NULL) < 0 ||
  51         snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, buffer_size) < 0 ||
  52         snd_pcm_hw_params(pcm_handle, hwparams) < 0) {
  53         ret = -1;
  54     }
  55
  56     if (hwparams)
  57         snd_pcm_hw_params_free(hwparams);
  58     return ret;
  59 }
  60
  61 int pa_create_io_sources(snd_pcm_t *pcm_handle, struct pa_mainloop_api* m, void ***io_sources, unsigned *n_io_sources, void (*cb)(struct pa_mainloop_api*a, void *id, int fd, enum pa_mainloop_api_io_events events, void *userdata), void *userdata) {
  62     unsigned i;
  63     struct pollfd *pfds, *ppfd;
  64     void **ios;
  65     assert(pcm_handle && m && io_sources && n_io_sources && cb);
  66
  67     *n_io_sources = snd_pcm_poll_descriptors_count(pcm_handle);
  68
  69     pfds = malloc(sizeof(struct pollfd) * *n_io_sources);
  70     assert(pfds);
  71     if (snd_pcm_poll_descriptors(pcm_handle, pfds, *n_io_sources) < 0) {
  72         free(pfds);
  73         return -1;
  74     }
  75
  76     *io_sources = malloc(sizeof(void*) * *n_io_sources);
  77     assert(io_sources);
  78
  79     for (i = 0, ios = *io_sources, ppfd = pfds; i < *n_io_sources; i++, ios++, ppfd++) {
  80         *ios = m->source_io(m, ppfd->fd,
  81                             ((ppfd->events & POLLIN) ? PA_MAINLOOP_API_IO_EVENT_INPUT : 0) |
  82                             ((ppfd->events & POLLOUT) ? PA_MAINLOOP_API_IO_EVENT_OUTPUT : 0), cb, userdata);
  83         assert(*ios);
  84     }
  85
  86     free(pfds);
  87     return 0;
  88 }
  89
  90 void pa_free_io_sources(struct pa_mainloop_api* m, void **io_sources, unsigned n_io_sources) {
  91     unsigned i;
  92     void **ios;
  93     assert(m && io_sources);
  94
  95     for (ios = io_sources, i = 0; i < n_io_sources; i++, ios++)
  96         m->cancel_io(m, *ios);
  97     free(io_sources);
  98 }