vorbis-tools/ogg123/audio.c

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
   4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
   5  * THE GNU PUBLIC LICENSE 2, WHICH IS INCLUDED WITH THIS SOURCE.    *
   6  * PLEASE READ THESE TERMS BEFORE DISTRIBUTING.                     *
   7  *                                                                  *
   8  * THE Ogg123 SOURCE CODE IS (C) COPYRIGHT 2000-2001                *
   9  * by Stan Seibert <volsung@xiph.org> AND OTHER CONTRIBUTORS        *
  10  * http://www.xiph.org/                                             *
  11  *                                                                  *
  12  ********************************************************************
  13
  14  last mod: $Id$
  15
  16  ********************************************************************/
  17
  18 #ifdef HAVE_CONFIG_H
  19 #include <config.h>
  20 #endif
  21
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <limits.h>
  25
  26 #include "audio.h"
  27
  28
  29 int audio_format_equal (audio_format_t *a, audio_format_t *b)
  30 {
  31   return
  32     a->big_endian    == b->big_endian    &&
  33     a->word_size     == b->word_size     &&
  34     a->signed_sample == b->signed_sample &&
  35     a->rate          == b->rate          &&
  36     a->channels      == b->channels      &&
  37     ((a->matrix==NULL && b->matrix==NULL) ||
  38      !strcmp(a->matrix,b->matrix));
  39 }
  40
  41 audio_device_t *append_audio_device(audio_device_t *devices_list,
  42                                      int driver_id,
  43                                      ao_option *options, char *filename)
  44 {
  45   if (devices_list != NULL) {
  46     while (devices_list->next_device != NULL)
  47       devices_list = devices_list->next_device;
  48     devices_list = devices_list->next_device =
  49       malloc(sizeof(audio_device_t));
  50   } else {
  51     devices_list = (audio_device_t *) malloc(sizeof(audio_device_t));
  52   }
  53   devices_list->driver_id = driver_id;
  54   devices_list->options = options;
  55   devices_list->filename = filename;
  56   devices_list->device = NULL;
  57   devices_list->next_device = NULL;
  58
  59   return devices_list;
  60 }
  61
  62
  63 int audio_devices_write(audio_device_t *d, void *ptr, int nbytes)
  64 {
  65
  66   while (d != NULL) {
  67     if (ao_play(d->device, ptr, nbytes) == 0)
  68       return 0; /* error occurred */
  69     d = d->next_device;
  70   }
  71
  72   return 1;
  73 }
  74
  75 int add_ao_option(ao_option **op_h, const char *optstring)
  76 {
  77   char *key, *value;
  78   int result;
  79
  80   key = strdup(optstring);
  81   if (key == NULL)
  82     return 0;
  83
  84   value = strchr(key, ':');
  85   if (value) {
  86     /* split by replacing the separator with a null */
  87     *value++ = '\0';
  88   }
  89
  90   result = ao_append_option(op_h, key, value);
  91   free(key);
  92
  93   return (result);
  94 }
  95
  96 void close_audio_devices (audio_device_t *devices)
  97 {
  98   audio_device_t *current = devices;
  99
 100   while (current != NULL) {
 101     if (current->device)
 102       ao_close(current->device);
 103     current->device = NULL;
 104     current = current->next_device;
 105   }
 106 }
 107
 108 void free_audio_devices (audio_device_t *devices)
 109 {
 110   audio_device_t *current;
 111
 112   while (devices != NULL) {
 113     current = devices->next_device;
 114     free (devices);
 115     devices = current;
 116   }
 117 }
 118
 119 void ao_onexit (void *arg)
 120 {
 121   audio_device_t *devices = (audio_device_t *) arg;
 122
 123   close_audio_devices (devices);
 124   free_audio_devices (devices);
 125
 126   ao_shutdown();
 127 }