chiark - git - mdw - disorder/blob - lib/uaudio-pulseaudio.c

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2013 Richard Kettlewell
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18 /** @file lib/uaudio-pulseaudio.c
  19  * @brief Support for PulseAudio backend */
  20 #include "common.h"
  21
  22 #if HAVE_PULSEAUDIO
  23
  24 #include <pulse/simple.h>
  25 #include <pulse/error.h>
  26
  27 #include "mem.h"
  28 #include "log.h"
  29 #include "uaudio.h"
  30 #include "configuration.h"
  31
  32 static const char *const pulseaudio_options[] = {
  33   "application",
  34   NULL
  35 };
  36
  37 static pa_simple *pulseaudio_simple_handle;
  38
  39 /** @brief Open the PulseAudio sound device */
  40 static void pulseaudio_open() {
  41   pa_sample_spec ss;
  42   int error;
  43   ss.format = -1;
  44   switch(uaudio_bits) {
  45   case 8:
  46     if(!uaudio_signed)
  47       ss.format = PA_SAMPLE_U8;
  48     break;
  49   case 16:
  50     if(uaudio_signed)
  51       ss.format = PA_SAMPLE_S16NE;
  52     break;
  53   case 32:
  54     if(uaudio_signed)
  55       ss.format = PA_SAMPLE_S32NE;
  56     break;
  57   }
  58   if(ss.format == -1)
  59     disorder_fatal(0, "unsupported uaudio format (%d, %d)",
  60                    uaudio_bits, uaudio_signed);
  61   ss.channels = uaudio_channels;
  62   ss.rate = uaudio_rate;
  63   pulseaudio_simple_handle = pa_simple_new(NULL,
  64                                            uaudio_get("application", "DisOrder"),
  65                                            PA_STREAM_PLAYBACK,
  66                                            NULL,
  67                                            "DisOrder",
  68                                            &ss,
  69                                            NULL,
  70                                            NULL,
  71                                            &error);
  72   if(!pulseaudio_simple_handle)
  73     disorder_fatal(0, "pa_simple_new: %s", pa_strerror(error));
  74 }
  75
  76 /** @brief Close the PulseAudio sound device */
  77 static void pulseaudio_close(void) {
  78   pa_simple_free(pulseaudio_simple_handle);
  79   pulseaudio_simple_handle = NULL;
  80 }
  81
  82 /** @brief Actually play sound via PulseAudio */
  83 static size_t pulseaudio_play(void *buffer, size_t samples,
  84                               unsigned attribute((unused)) flags) {
  85   int error;
  86   int ret = pa_simple_write(pulseaudio_simple_handle,
  87                             buffer,
  88                             samples * uaudio_sample_size,
  89                             &error);
  90   if(ret < 0)
  91     disorder_fatal(0, "pa_simple_write: %s", pa_strerror(error));
  92   return samples;
  93 }
  94
  95 static void pulseaudio_start(uaudio_callback *callback,
  96                              void *userdata) {
  97   pulseaudio_open();
  98   uaudio_thread_start(callback, userdata, pulseaudio_play,
  99                       32 / uaudio_sample_size,
 100                       4096 / uaudio_sample_size,
 101                       0);
 102 }
 103
 104 static void pulseaudio_stop(void) {
 105   uaudio_thread_stop();
 106   pulseaudio_close();
 107 }
 108
 109 static void pulseaudio_open_mixer(void) {
 110   disorder_error(0, "no pulseaudio mixer support yet");
 111 }
 112
 113 static void pulseaudio_close_mixer(void) {
 114 }
 115
 116 static void pulseaudio_get_volume(int *left, int *right) {
 117   *left = *right = 0;
 118 }
 119
 120 static void pulseaudio_set_volume(int *left, int *right) {
 121   *left = *right = 0;
 122 }
 123
 124 static void pulseaudio_configure(void) {
 125 }
 126
 127 const struct uaudio uaudio_pulseaudio = {
 128   .name = "pulseaudio",
 129   .options = pulseaudio_options,
 130   .start = pulseaudio_start,
 131   .stop = pulseaudio_stop,
 132   .activate = uaudio_thread_activate,
 133   .deactivate = uaudio_thread_deactivate,
 134   .open_mixer = pulseaudio_open_mixer,
 135   .close_mixer = pulseaudio_close_mixer,
 136   .get_volume = pulseaudio_get_volume,
 137   .set_volume = pulseaudio_set_volume,
 138   .configure = pulseaudio_configure,
 139   .flags = UAUDIO_API_CLIENT,
 140 };
 141
 142 #endif
 143
 144 /*
 145 Local Variables:
 146 c-basic-offset:2
 147 comment-column:40
 148 fill-column:79
 149 indent-tabs-mode:nil
 150 End:
 151 */