annotate decoders/ogg.c @ 233:15a3b1a1291c

Kludged implementation of the rewind method.
author Ryan C. Gordon <icculus@icculus.org>
date Sat, 19 Jan 2002 20:02:55 +0000
parents d3dc34315ac7
children c97be6e1bd27
rev   line source
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1 /*
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2 * SDL_sound -- An abstract sound format decoding API.
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3 * Copyright (C) 2001 Ryan C. Gordon.
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4 *
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5 * This library is free software; you can redistribute it and/or
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6 * modify it under the terms of the GNU Lesser General Public
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7 * License as published by the Free Software Foundation; either
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8 * version 2.1 of the License, or (at your option) any later version.
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9 *
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10 * This library is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 * Lesser General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU Lesser General Public
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16 * License along with this library; if not, write to the Free Software
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17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 */
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19
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20 /*
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21 * Ogg Vorbis decoder for SDL_sound.
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22 *
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23 * This driver handles .OGG audio files, and depends on libvorbisfile to
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24 * do the actual decoding work. libvorbisfile is part of libvorbis, which
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25 * is part of the Ogg Vorbis project.
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26 *
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27 * Ogg Vorbis: http://www.xiph.org/ogg/vorbis/
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28 * vorbisfile documentation: http://www.xiph.org/ogg/vorbis/doc/vorbisfile/
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29 *
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30 * Please see the file COPYING in the source's root directory.
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31 *
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32 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org)
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33 */
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34
106
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35 #if HAVE_CONFIG_H
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36 # include <config.h>
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37 #endif
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38
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39 #ifdef SOUND_SUPPORTS_OGG
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40
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41 #include <stdio.h>
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42 #include <stdlib.h>
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43 #include <string.h>
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44 #include <math.h>
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45 #include <assert.h>
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46
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47 #include "SDL_sound.h"
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48
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49 #define __SDL_SOUND_INTERNAL__
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50 #include "SDL_sound_internal.h"
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51
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52 #include "vorbis/codec.h"
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53 #include "vorbis/vorbisfile.h"
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54
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55
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56 static int OGG_init(void);
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57 static void OGG_quit(void);
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58 static int OGG_open(Sound_Sample *sample, const char *ext);
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59 static void OGG_close(Sound_Sample *sample);
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60 static Uint32 OGG_read(Sound_Sample *sample);
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61 static int OGG_rewind(Sound_Sample *sample);
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62
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63 static const char *extensions_ogg[] = { "OGG", NULL };
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64 const Sound_DecoderFunctions __Sound_DecoderFunctions_OGG =
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65 {
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66 {
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67 extensions_ogg,
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68 "Ogg Vorbis audio through VorbisFile",
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69 "Ryan C. Gordon <icculus@clutteredmind.org>",
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70 "http://www.icculus.org/SDL_sound/"
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71 },
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72
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73 OGG_init, /* init() method */
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74 OGG_quit, /* quit() method */
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75 OGG_open, /* open() method */
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76 OGG_close, /* close() method */
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77 OGG_read, /* read() method */
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78 OGG_rewind /* rewind() method */
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79 };
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81
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82 static int OGG_init(void)
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83 {
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84 return(1); /* always succeeds. */
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85 } /* OGG_init */
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87
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88 static void OGG_quit(void)
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89 {
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90 /* it's a no-op. */
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91 } /* OGG_quit */
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94
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95 /*
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96 * These are callbacks from vorbisfile that let them read data from
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97 * a RWops...
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98 */
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99
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100 static size_t RWops_ogg_read(void *ptr, size_t size, size_t nmemb, void *datasource)
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101 {
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102 return((size_t) SDL_RWread((SDL_RWops *) datasource, ptr, size, nmemb));
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103 } /* RWops_ogg_read */
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104
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105 static int RWops_ogg_seek(void *datasource, ogg_int64_t offset, int whence)
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106 {
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107 return(SDL_RWseek((SDL_RWops *) datasource, offset, whence));
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108 } /* RWops_ogg_seek */
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109
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110 static int RWops_ogg_close(void *datasource)
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111 {
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112 /* do nothing; SDL_sound will delete the RWops at a higher level. */
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113 return(0); /* this is success in fclose(), so I guess that's okay. */
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114 } /* RWops_ogg_close */
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115
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116 static long RWops_ogg_tell(void *datasource)
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117 {
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118 return((long) SDL_RWtell((SDL_RWops *) datasource));
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119 } /* RWops_ogg_tell */
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120
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121 static const ov_callbacks RWops_ogg_callbacks =
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122 {
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123 RWops_ogg_read,
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124 RWops_ogg_seek,
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125 RWops_ogg_close,
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126 RWops_ogg_tell
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127 };
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128
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129
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130 /* Return a human readable version of an VorbisFile error code... */
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131 #if (defined DEBUG_CHATTER)
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132 static const char *ogg_error(int errnum)
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133 {
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134 switch(errnum)
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135 {
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136 case OV_EREAD:
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137 return("i/o error");
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138 case OV_ENOTVORBIS:
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139 return("not a vorbis file");
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140 case OV_EVERSION:
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141 return("Vorbis version mismatch");
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142 case OV_EBADHEADER:
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143 return("invalid Vorbis bitstream header");
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144 case OV_EFAULT:
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145 return("internal logic fault in Vorbis library");
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146 } /* switch */
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147
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148 return("unknown error");
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149 } /* ogg_error */
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150 #endif
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151
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152 static __inline__ void output_ogg_comments(OggVorbis_File *vf)
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153 {
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154 #if (defined DEBUG_CHATTER)
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155 int i;
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156 vorbis_comment *vc = ov_comment(vf, -1);
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157
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158 if (vc == NULL)
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Ryan C. Gordon <icculus@icculus.org>
parents:
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159 return;
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160
59
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161 SNDDBG(("OGG: vendor == [%s].\n", vc->vendor));
24
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Ryan C. Gordon <icculus@icculus.org>
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162 for (i = 0; i < vc->comments; i++)
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Ryan C. Gordon <icculus@icculus.org>
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163 {
59
cd91e1857b42 Changed _D macro to SNDDBG, and fixed a warning if compiling without debug
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
164 SNDDBG(("OGG: user comment [%s].\n", vc->user_comments[i]));
24
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165 } /* for */
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Ryan C. Gordon <icculus@icculus.org>
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166 #endif
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Ryan C. Gordon <icculus@icculus.org>
parents:
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167 } /* output_ogg_comments */
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Ryan C. Gordon <icculus@icculus.org>
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168
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169
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Ryan C. Gordon <icculus@icculus.org>
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170 static int OGG_open(Sound_Sample *sample, const char *ext)
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171 {
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Ryan C. Gordon <icculus@icculus.org>
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172 int rc;
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Ryan C. Gordon <icculus@icculus.org>
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173 OggVorbis_File *vf;
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Ryan C. Gordon <icculus@icculus.org>
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174 vorbis_info *info;
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Ryan C. Gordon <icculus@icculus.org>
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175 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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176
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177 vf = (OggVorbis_File *) malloc(sizeof (OggVorbis_File));
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178 BAIL_IF_MACRO(vf == NULL, ERR_OUT_OF_MEMORY, 0);
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179
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180 rc = ov_open_callbacks(internal->rw, vf, NULL, 0, RWops_ogg_callbacks);
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181 if (rc != 0)
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Ryan C. Gordon <icculus@icculus.org>
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182 {
59
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183 SNDDBG(("OGG: can't grok data. reason: [%s].\n", ogg_error(rc)));
24
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Ryan C. Gordon <icculus@icculus.org>
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184 free(vf);
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Ryan C. Gordon <icculus@icculus.org>
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185 BAIL_MACRO("OGG: Not valid Ogg Vorbis data.", 0);
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Ryan C. Gordon <icculus@icculus.org>
parents:
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186 } /* if */
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187
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188 info = ov_info(vf, -1);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
189 if (info == NULL)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
190 {
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Ryan C. Gordon <icculus@icculus.org>
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191 ov_clear(vf);
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Ryan C. Gordon <icculus@icculus.org>
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192 free(vf);
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Ryan C. Gordon <icculus@icculus.org>
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193 BAIL_MACRO("OGG: failed to retrieve bitstream info", 0);
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Ryan C. Gordon <icculus@icculus.org>
parents:
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194 } /* if */
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195
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196 SNDDBG(("OGG: Accepting data stream.\n"));
24
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197
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198 output_ogg_comments(vf);
59
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199 SNDDBG(("OGG: bitstream version == (%d).\n", info->version));
cd91e1857b42 Changed _D macro to SNDDBG, and fixed a warning if compiling without debug
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200 SNDDBG(("OGG: bitstream channels == (%d).\n", info->channels));
cd91e1857b42 Changed _D macro to SNDDBG, and fixed a warning if compiling without debug
Ryan C. Gordon <icculus@icculus.org>
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201 SNDDBG(("OGG: bitstream sampling rate == (%ld).\n", info->rate));
cd91e1857b42 Changed _D macro to SNDDBG, and fixed a warning if compiling without debug
Ryan C. Gordon <icculus@icculus.org>
parents: 47
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202 SNDDBG(("OGG: seekable == {%s}.\n", ov_seekable(vf) ? "TRUE" : "FALSE"));
cd91e1857b42 Changed _D macro to SNDDBG, and fixed a warning if compiling without debug
Ryan C. Gordon <icculus@icculus.org>
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203 SNDDBG(("OGG: number of logical bitstreams == (%ld).\n", ov_streams(vf)));
cd91e1857b42 Changed _D macro to SNDDBG, and fixed a warning if compiling without debug
Ryan C. Gordon <icculus@icculus.org>
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204 SNDDBG(("OGG: serial number == (%ld).\n", ov_serialnumber(vf, -1)));
cd91e1857b42 Changed _D macro to SNDDBG, and fixed a warning if compiling without debug
Ryan C. Gordon <icculus@icculus.org>
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205 SNDDBG(("OGG: total seconds of sample == (%f).\n", ov_time_total(vf, -1)));
24
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206
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Ryan C. Gordon <icculus@icculus.org>
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207 internal->decoder_private = vf;
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Ryan C. Gordon <icculus@icculus.org>
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208 sample->flags = SOUND_SAMPLEFLAG_NONE;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
209 sample->actual.rate = (Uint32) info->rate;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
210 sample->actual.channels = (Uint8) info->channels;
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Ryan C. Gordon <icculus@icculus.org>
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211
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
212 /*
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Ryan C. Gordon <icculus@icculus.org>
parents:
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213 * Since we might have more than one logical bitstream in the OGG file,
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Ryan C. Gordon <icculus@icculus.org>
parents:
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214 * and these bitstreams may be in different formats, we might be
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Ryan C. Gordon <icculus@icculus.org>
parents:
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215 * converting two or three times: once in vorbisfile, once again in
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
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216 * SDL_sound, and perhaps a third time to get it to the sound device's
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
217 * format. That's wickedly inefficient.
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
218 *
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
219 * To combat this a little, if the user specified a desired format, we
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
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220 * claim that to be the "actual" format of the collection of logical
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
221 * bitstreams. This means that VorbisFile will do a conversion as
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
222 * necessary, and SDL_sound will not. If the user didn't specify a
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
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223 * desired format, then we pretend the "actual" format is something that
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
224 * OGG files are apparently commonly encoded in.
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
225 */
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
226 sample->actual.format = (sample->desired.format == 0) ?
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
227 AUDIO_S16LSB : sample->desired.format;
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parents:
diff changeset
228 return(1);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
229 } /* OGG_open */
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diff changeset
230
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diff changeset
231
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
232 static void OGG_close(Sound_Sample *sample)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
233 {
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
234 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
235 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
236 ov_clear(vf);
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
237 free(vf);
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
238 } /* OGG_close */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
239
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diff changeset
240
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
241 static Uint32 OGG_read(Sound_Sample *sample)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
242 {
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
243 int rc;
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
244 int bitstream;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
245 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
246 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private;
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
247
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
248 rc = ov_read(vf, internal->buffer, internal->buffer_size,
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
249 ((sample->actual.format & 0x1000) ? 1 : 0), /* bigendian? */
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
250 ((sample->actual.format & 0xFF) / 8), /* bytes per sample point */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
251 ((sample->actual.format & 0x8000) ? 1 : 0), /* signed data? */
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
252 &bitstream);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
253
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
254 /* Make sure the read went smoothly... */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
255 if (rc == 0)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
256 sample->flags |= SOUND_SAMPLEFLAG_EOF;
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
257
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
258 else if (rc < 0)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
259 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
260
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
261 /* (next call this EAGAIN may turn into an EOF or error.) */
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
262 else if ((Uint32) rc < internal->buffer_size)
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
263 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
264
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
265 return((Uint32) rc);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
266 } /* OGG_read */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
267
221
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
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diff changeset
268
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
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diff changeset
269 static int OGG_rewind(Sound_Sample *sample)
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 184
diff changeset
270 {
231
d3dc34315ac7 Rewind method implemented by Torbj�rn.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
271 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
d3dc34315ac7 Rewind method implemented by Torbj�rn.
Ryan C. Gordon <icculus@icculus.org>
parents: 221
diff changeset
272 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private;
d3dc34315ac7 Rewind method implemented by Torbj�rn.
Ryan C. Gordon <icculus@icculus.org>
parents: 221
diff changeset
273
d3dc34315ac7 Rewind method implemented by Torbj�rn.
Ryan C. Gordon <icculus@icculus.org>
parents: 221
diff changeset
274 BAIL_IF_MACRO(ov_raw_seek(vf, 0) < 0, ERR_IO_ERROR, 0);
d3dc34315ac7 Rewind method implemented by Torbj�rn.
Ryan C. Gordon <icculus@icculus.org>
parents: 221
diff changeset
275 return(1);
221
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 184
diff changeset
276 } /* OGG_rewind */
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 184
diff changeset
277
63
9669aa13d3e0 Changes in preparation for autoconf, and the RWops wrappers changed to
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diff changeset
278 #endif /* SOUND_SUPPORTS_OGG */
9669aa13d3e0 Changes in preparation for autoconf, and the RWops wrappers changed to
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diff changeset
279
9669aa13d3e0 Changes in preparation for autoconf, and the RWops wrappers changed to
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
280
24
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Ryan C. Gordon <icculus@icculus.org>
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281 /* end of ogg.c ... */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
282