code.delx.au - pulseaudio/blob - polyp/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 Lesser 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 Lesser 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 #include "xmalloc.h"
  31
  32 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) {
  33     int ret = 0;
  34     snd_pcm_hw_params_t *hwparams = NULL;
  35     static const snd_pcm_format_t format_trans[] = {
  36         [PA_SAMPLE_U8] = SND_PCM_FORMAT_U8,
  37         [PA_SAMPLE_ALAW] = SND_PCM_FORMAT_A_LAW,
  38         [PA_SAMPLE_ULAW] = SND_PCM_FORMAT_MU_LAW,
  39         [PA_SAMPLE_S16LE] = SND_PCM_FORMAT_S16_LE,
  40         [PA_SAMPLE_S16BE] = SND_PCM_FORMAT_S16_BE,
  41         [PA_SAMPLE_FLOAT32LE] = SND_PCM_FORMAT_FLOAT_LE,
  42         [PA_SAMPLE_FLOAT32BE] = SND_PCM_FORMAT_FLOAT_BE,
  43     };
  44
  45     if (snd_pcm_hw_params_malloc(&hwparams) < 0 ||
  46         snd_pcm_hw_params_any(pcm_handle, hwparams) < 0 ||
  47         snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED) < 0 ||
  48         snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[ss->format]) < 0 ||
  49         snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &ss->rate, NULL) < 0 ||
  50         snd_pcm_hw_params_set_channels(pcm_handle, hwparams, ss->channels) < 0 ||
  51         snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, periods, NULL) < 0 ||
  52         snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, buffer_size) < 0 ||
  53         snd_pcm_hw_params(pcm_handle, hwparams) < 0) {
  54         ret = -1;
  55     }
  56
  57     if (hwparams)
  58         snd_pcm_hw_params_free(hwparams);
  59     return ret;
  60 }
  61
  62 int pa_create_io_events(snd_pcm_t *pcm_handle, struct pa_mainloop_api* m, struct pa_io_event ***io_events, unsigned *n_io_events, void (*cb)(struct pa_mainloop_api*a, struct pa_io_event *e, int fd, enum pa_io_event_flags events, void *userdata), void *userdata) {
  63     unsigned i;
  64     struct pollfd *pfds, *ppfd;
  65     struct pa_io_event **ios;
  66     assert(pcm_handle && m && io_events && n_io_events && cb);
  67
  68     *n_io_events = snd_pcm_poll_descriptors_count(pcm_handle);
  69
  70     pfds = pa_xmalloc(sizeof(struct pollfd) * *n_io_events);
  71     if (snd_pcm_poll_descriptors(pcm_handle, pfds, *n_io_events) < 0) {
  72         pa_xfree(pfds);
  73         return -1;
  74     }
  75
  76     *io_events = pa_xmalloc(sizeof(void*) * *n_io_events);
  77
  78     for (i = 0, ios = *io_events, ppfd = pfds; i < *n_io_events; i++, ios++, ppfd++) {
  79         *ios = m->io_new(m, ppfd->fd,
  80                             ((ppfd->events & POLLIN) ? PA_IO_EVENT_INPUT : 0) |
  81                             ((ppfd->events & POLLOUT) ? PA_IO_EVENT_OUTPUT : 0), cb, userdata);
  82         assert(*ios);
  83     }
  84
  85     pa_xfree(pfds);
  86     return 0;
  87 }
  88
  89 void pa_free_io_events(struct pa_mainloop_api* m, struct pa_io_event **io_events, unsigned n_io_events) {
  90     unsigned i;
  91     struct pa_io_event **ios;
  92     assert(m && io_events);
  93
  94     for (ios = io_events, i = 0; i < n_io_events; i++, ios++)
  95         m->io_free(*ios);
  96     pa_xfree(io_events);
  97 }