vorbis-tools-1.2.0/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: audio.c,v 1.2 2001/12/19 02:52:53 volsung Exp $
  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 }
  38
  39
  40 audio_device_t *append_audio_device(audio_device_t *devices_list,
  41                                      int driver_id,
  42                                      ao_option *options, char *filename)
  43 {
  44   audio_device_t *head = devices_list;
  45
  46   if (devices_list != NULL) {
  47     while (devices_list->next_device != NULL)
  48       devices_list = devices_list->next_device;
  49     devices_list = devices_list->next_device =
  50       malloc(sizeof(audio_device_t));
  51   } else {
  52     head = devices_list = (audio_device_t *) malloc(sizeof(audio_device_t));
  53   }
  54   devices_list->driver_id = driver_id;
  55   devices_list->options = options;
  56   devices_list->filename = filename;
  57   devices_list->device = NULL;
  58   devices_list->next_device = NULL;
  59
  60   return devices_list;
  61 }
  62
  63
  64 int audio_devices_write(audio_device_t *d, void *ptr, int nbytes)
  65 {
  66
  67   while (d != NULL) {
  68     if (ao_play(d->device, ptr, nbytes) == 0)
  69       return 0; /* error occurred */
  70     d = d->next_device;
  71   }
  72
  73   return 1;
  74 }
  75
  76 int add_ao_option(ao_option **op_h, const char *optstring)
  77 {
  78   char *key, *value;
  79   int result;
  80
  81   key = strdup(optstring);
  82   if (key == NULL)
  83     return 0;
  84
  85   value = strchr(key, ':');
  86   if (value == NULL) {
  87     free(key);
  88     return 0;
  89   }
  90
  91   /* split by replacing the separator with a null */
  92   *value++ = '\0';
  93
  94   result = ao_append_option(op_h, key, value);
  95   free(key);
  96
  97   return (result);
  98 }
  99
 100 void close_audio_devices (audio_device_t *devices)
 101 {
 102   audio_device_t *current = devices;
 103
 104   while (current != NULL) {
 105     if (current->device)
 106       ao_close(current->device);
 107     current->device = NULL;
 108     current = current->next_device;
 109   }
 110 }
 111
 112 void free_audio_devices (audio_device_t *devices)
 113 {
 114   audio_device_t *current;
 115
 116   while (devices != NULL) {
 117     current = devices->next_device;
 118     free (devices);
 119     devices = current;
 120   }
 121 }
 122
 123 void ao_onexit (void *arg)
 124 {
 125   audio_device_t *devices = (audio_device_t *) arg;
 126
 127   close_audio_devices (devices);
 128   free_audio_devices (devices);
 129
 130   ao_shutdown();
 131 }