annotate decoders/ogg.c @ 549:394e3ec86164 stable-1.0 release-1.0.3

Upped version to 1.0.3.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 20 Apr 2008 20:36:59 +0000
parents 50bb9a6cebfe
children
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@icculus.org)
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33 */
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34
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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
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46 #include "SDL_sound.h"
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47
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48 #define __SDL_SOUND_INTERNAL__
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49 #include "SDL_sound_internal.h"
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50
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51 #include <vorbis/codec.h>
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52 #include <vorbis/vorbisfile.h>
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54
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55 static int OGG_init(void);
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56 static void OGG_quit(void);
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57 static int OGG_open(Sound_Sample *sample, const char *ext);
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58 static void OGG_close(Sound_Sample *sample);
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59 static Uint32 OGG_read(Sound_Sample *sample);
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60 static int OGG_rewind(Sound_Sample *sample);
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61 static int OGG_seek(Sound_Sample *sample, Uint32 ms);
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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@icculus.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 OGG_seek /* seek() method */
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80 };
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81
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82
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83 static int OGG_init(void)
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84 {
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85 return(1); /* always succeeds. */
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86 } /* OGG_init */
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87
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88
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89 static void OGG_quit(void)
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90 {
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91 /* it's a no-op. */
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92 } /* OGG_quit */
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93
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95
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96 /*
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97 * These are callbacks from vorbisfile that let them read data from
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98 * a RWops...
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99 */
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100
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101 static size_t RWops_ogg_read(void *ptr, size_t size, size_t nmemb, void *datasource)
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102 {
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103 return((size_t) SDL_RWread((SDL_RWops *) datasource, ptr, size, nmemb));
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104 } /* RWops_ogg_read */
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105
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106 static int RWops_ogg_seek(void *datasource, ogg_int64_t offset, int whence)
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107 {
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108 return(SDL_RWseek((SDL_RWops *) datasource, offset, whence));
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109 } /* RWops_ogg_seek */
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110
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111 static int RWops_ogg_close(void *datasource)
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112 {
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113 /* do nothing; SDL_sound will delete the RWops at a higher level. */
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114 return(0); /* this is success in fclose(), so I guess that's okay. */
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115 } /* RWops_ogg_close */
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116
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117 static long RWops_ogg_tell(void *datasource)
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118 {
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119 return((long) SDL_RWtell((SDL_RWops *) datasource));
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120 } /* RWops_ogg_tell */
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121
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122 static const ov_callbacks RWops_ogg_callbacks =
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123 {
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124 RWops_ogg_read,
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125 RWops_ogg_seek,
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126 RWops_ogg_close,
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127 RWops_ogg_tell
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128 };
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129
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130
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131 /* Return a human readable version of an VorbisFile error code... */
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132 #if (defined DEBUG_CHATTER)
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133 static const char *ogg_error(int errnum)
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134 {
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135 switch(errnum)
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136 {
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137 case OV_EREAD:
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138 return("i/o error");
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139 case OV_ENOTVORBIS:
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140 return("not a vorbis file");
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141 case OV_EVERSION:
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142 return("Vorbis version mismatch");
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143 case OV_EBADHEADER:
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144 return("invalid Vorbis bitstream header");
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145 case OV_EFAULT:
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146 return("internal logic fault in Vorbis library");
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147 } /* switch */
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148
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149 return("unknown error");
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150 } /* ogg_error */
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151 #endif
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152
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153 static __inline__ void output_ogg_comments(OggVorbis_File *vf)
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154 {
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155 #if (defined DEBUG_CHATTER)
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156 int i;
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157 vorbis_comment *vc = ov_comment(vf, -1);
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158
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
159 if (vc == NULL)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
160 return;
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161
59
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162 SNDDBG(("OGG: vendor == [%s].\n", vc->vendor));
24
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Ryan C. Gordon <icculus@icculus.org>
parents:
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163 for (i = 0; i < vc->comments; i++)
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Ryan C. Gordon <icculus@icculus.org>
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164 {
59
cd91e1857b42 Changed _D macro to SNDDBG, and fixed a warning if compiling without debug
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165 SNDDBG(("OGG: user comment [%s].\n", vc->user_comments[i]));
24
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Ryan C. Gordon <icculus@icculus.org>
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166 } /* for */
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Ryan C. Gordon <icculus@icculus.org>
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167 #endif
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Ryan C. Gordon <icculus@icculus.org>
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168 } /* output_ogg_comments */
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169
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170
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171 static int OGG_open(Sound_Sample *sample, const char *ext)
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Ryan C. Gordon <icculus@icculus.org>
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172 {
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Ryan C. Gordon <icculus@icculus.org>
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173 int rc;
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Ryan C. Gordon <icculus@icculus.org>
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174 OggVorbis_File *vf;
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Ryan C. Gordon <icculus@icculus.org>
parents:
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175 vorbis_info *info;
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Ryan C. Gordon <icculus@icculus.org>
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176 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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177
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178 vf = (OggVorbis_File *) malloc(sizeof (OggVorbis_File));
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179 BAIL_IF_MACRO(vf == NULL, ERR_OUT_OF_MEMORY, 0);
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180
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181 rc = ov_open_callbacks(internal->rw, vf, NULL, 0, RWops_ogg_callbacks);
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182 if (rc != 0)
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Ryan C. Gordon <icculus@icculus.org>
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183 {
59
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184 SNDDBG(("OGG: can't grok data. reason: [%s].\n", ogg_error(rc)));
24
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185 free(vf);
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Ryan C. Gordon <icculus@icculus.org>
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186 BAIL_MACRO("OGG: Not valid Ogg Vorbis data.", 0);
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Ryan C. Gordon <icculus@icculus.org>
parents:
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187 } /* if */
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188
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Ryan C. Gordon <icculus@icculus.org>
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189 info = ov_info(vf, -1);
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Ryan C. Gordon <icculus@icculus.org>
parents:
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190 if (info == NULL)
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Ryan C. Gordon <icculus@icculus.org>
parents:
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191 {
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Ryan C. Gordon <icculus@icculus.org>
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192 ov_clear(vf);
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Ryan C. Gordon <icculus@icculus.org>
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193 free(vf);
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Ryan C. Gordon <icculus@icculus.org>
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194 BAIL_MACRO("OGG: failed to retrieve bitstream info", 0);
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Ryan C. Gordon <icculus@icculus.org>
parents:
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195 } /* if */
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196
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197 SNDDBG(("OGG: Accepting data stream.\n"));
24
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198
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199 output_ogg_comments(vf);
59
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200 SNDDBG(("OGG: bitstream version == (%d).\n", info->version));
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 channels == (%d).\n", info->channels));
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Ryan C. Gordon <icculus@icculus.org>
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202 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>
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203 SNDDBG(("OGG: seekable == {%s}.\n", ov_seekable(vf) ? "TRUE" : "FALSE"));
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Ryan C. Gordon <icculus@icculus.org>
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204 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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205 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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diff changeset
206 SNDDBG(("OGG: total seconds of sample == (%f).\n", ov_time_total(vf, -1)));
24
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207
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208 internal->decoder_private = vf;
327
aa7f6a110971 Added seek implementation.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
209 sample->flags = SOUND_SAMPLEFLAG_CANSEEK;
24
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diff changeset
210 sample->actual.rate = (Uint32) info->rate;
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
211 sample->actual.channels = (Uint8) info->channels;
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Ryan C. Gordon <icculus@icculus.org>
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212
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
213 /*
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
214 * Since we might have more than one logical bitstream in the OGG file,
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
215 * and these bitstreams may be in different formats, we might be
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
216 * converting two or three times: once in vorbisfile, once again in
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
217 * 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
218 * format. That's wickedly inefficient.
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
219 *
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
220 * To combat this a little, if the user specified a desired format, we
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
221 * claim that to be the "actual" format of the collection of logical
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
222 * bitstreams. This means that VorbisFile will do a conversion as
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
223 * necessary, and SDL_sound will not. If the user didn't specify a
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
224 * desired format, then we pretend the "actual" format is something that
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
225 * OGG files are apparently commonly encoded in.
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
226 */
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
227 sample->actual.format = (sample->desired.format == 0) ?
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
228 AUDIO_S16LSB : sample->desired.format;
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
229 return(1);
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
230 } /* OGG_open */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
231
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
232
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
233 static void OGG_close(Sound_Sample *sample)
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
234 {
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
235 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
236 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private;
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
237 ov_clear(vf);
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
238 free(vf);
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
239 } /* OGG_close */
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
240
433
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
241 /* Note: According to the Vorbis documentation:
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
242 * "ov_read() will decode at most one vorbis packet per invocation,
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
243 * so the value returned will generally be less than length."
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
244 * Due to this, for buffer sizes like 16384, SDL_Sound was always getting
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
245 * an underfilled buffer and always setting the EAGAIN flag.
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
246 * Since the SDL_Sound API implies that the entire buffer
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
247 * should be filled unless EOF, additional code has been added
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
248 * to this function to call ov_read() until the buffer is filled.
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
249 * However, there may still be some corner cases where the buffer
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
250 * cannot be entirely filled. So be aware.
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
251 */
24
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
252 static Uint32 OGG_read(Sound_Sample *sample)
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
253 {
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
254 int rc;
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
255 int bitstream;
433
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
256 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
24
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
257 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private;
433
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
258
24
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
259 rc = ov_read(vf, internal->buffer, internal->buffer_size,
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
260 ((sample->actual.format & 0x1000) ? 1 : 0), /* bigendian? */
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
261 ((sample->actual.format & 0xFF) / 8), /* bytes per sample point */
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
262 ((sample->actual.format & 0x8000) ? 1 : 0), /* signed data? */
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
263 &bitstream);
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
264
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
265 /* Make sure the read went smoothly... */
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
266 if (rc == 0)
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
267 sample->flags |= SOUND_SAMPLEFLAG_EOF;
433
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
268
24
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
269 else if (rc < 0)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
270 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
271
433
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
272 /* If the buffer isn't filled, keep trying to fill it
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
273 * until no more data can be grabbed */
24
0fc0f91b1b84 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
274 else if ((Uint32) rc < internal->buffer_size)
433
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
275 {
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
276 /* Creating a pointer to the buffer that denotes where to start
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
277 * writing new data. */
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
278 Uint8* buffer_start_point = NULL;
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
279 int total_bytes_read = rc;
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
280 int bytes_remaining = internal->buffer_size - rc;
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
281
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
282 /* Keep grabbing data until something prevents
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
283 * us from getting more. (Could be EOF,
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
284 * packets are too large to fit in remaining
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
285 * space, or an error.)
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
286 */
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
287 while( (rc > 0) && (bytes_remaining > 0) )
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
288 {
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
289 /* Set buffer pointer to end of last write */
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
290 /* All the messiness is to get rid of the warning for
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
291 * dereferencing a void*
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
292 */
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
293 buffer_start_point = &(((Uint8*)internal->buffer)[total_bytes_read]);
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
294 rc = ov_read(vf, buffer_start_point, bytes_remaining,
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
295 ((sample->actual.format & 0x1000) ? 1 : 0), /* bigendian? */
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
296 ((sample->actual.format & 0xFF) / 8), /* bytes per sample point */
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
297 ((sample->actual.format & 0x8000) ? 1 : 0), /* signed data? */
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
298 &bitstream);
f1c16afd9ebe Read until buffer is full in Sound_Decode() rather than one packet per call.
Ryan C. Gordon <icculus@icculus.org>
parents: 377
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299 /* Make sure rc > 0 because we don't accidently want
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300 * to change the counters if there was an error
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301 */
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302 if(rc > 0)
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303 {
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304 total_bytes_read += rc;
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305 bytes_remaining = bytes_remaining - rc;
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306 }
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307 }
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308 /* I think the minimum read size is 2, though I'm
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309 * not sure about this. (I've hit cases where I
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310 * couldn't read less than 4.) What I don't want to do is
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311 * accidently claim we hit EOF when the reason rc == 0
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312 * is because the requested amount of data was smaller
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313 * than the minimum packet size.
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314 * For now, I will be conservative
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315 * and not set the EOF flag, and let the next call to
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316 * this function figure it out.
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317 * I think the ERROR flag is safe to set because
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318 * it looks like OGG simply returns 0 if the
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319 * read size is too small.
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320 * And in most cases for sensible buffer sizes,
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321 * this fix will fill the buffer,
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322 * so we can set the EAGAIN flag without worrying
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323 * that it will always be set.
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324 */
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325 if(rc < 0)
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326 {
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327 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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328 }
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329 else if(rc == 0)
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330 {
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331 /* Do nothing for now until there is a better solution */
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332 /* sample->flags |= SOUND_SAMPLEFLAG_EOF; */
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333 }
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334
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335 /* Test for a buffer underrun. It should occur less frequently
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336 * now, but it still may happen and not necessarily mean
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337 * anything useful. */
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338 if ((Uint32) total_bytes_read < internal->buffer_size)
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339 {
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340 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
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341 }
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342 /* change rc to the total bytes read so function
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343 * can return the correct value.
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344 */
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345 rc = total_bytes_read;
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346 }
24
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347
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348 return((Uint32) rc);
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349 } /* OGG_read */
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350
221
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351
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352 static int OGG_rewind(Sound_Sample *sample)
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353 {
231
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354 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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355 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private;
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356
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357 BAIL_IF_MACRO(ov_raw_seek(vf, 0) < 0, ERR_IO_ERROR, 0);
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358 return(1);
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359 } /* OGG_rewind */
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360
306
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361
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362 static int OGG_seek(Sound_Sample *sample, Uint32 ms)
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363 {
327
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364 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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365 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private;
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366 double timepos = (((double) ms) / 1000.0);
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367 BAIL_IF_MACRO(ov_time_seek(vf, timepos) < 0, ERR_IO_ERROR, 0);
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368 return(1);
306
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369 } /* OGG_seek */
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370
63
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371 #endif /* SOUND_SUPPORTS_OGG */
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372
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373
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374 /* end of ogg.c ... */
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375