Mercurial > SDL_sound_CoreAudio
annotate decoders/voc.c @ 385:9efb760c4a6b
FIXME removal and cleanups.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 05 Jul 2002 22:32:54 +0000 |
| parents | cbb15ecf423a |
| children | fb519e6028e3 |
| rev | line source |
|---|---|
| 14 | 1 /* |
| 2 * SDL_sound -- An abstract sound format decoding API. | |
| 3 * Copyright (C) 2001 Ryan C. Gordon. | |
| 4 * | |
| 5 * This library is free software; you can redistribute it and/or | |
| 6 * modify it under the terms of the GNU Lesser General Public | |
| 7 * License as published by the Free Software Foundation; either | |
| 8 * version 2.1 of the License, or (at your option) any later version. | |
| 9 * | |
| 10 * This library 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 GNU | |
| 13 * Lesser General Public License for more details. | |
| 14 * | |
| 15 * You should have received a copy of the GNU Lesser General Public | |
| 16 * License along with this library; if not, write to the Free Software | |
| 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 */ | |
| 19 | |
| 20 /* | |
| 21 * VOC decoder for SDL_sound. | |
| 22 * | |
| 23 * This driver handles Creative Labs VOC audio data...this is a legacy format, | |
| 24 * but there's some game ports that could make use of such a decoder. Plus, | |
| 25 * VOC is fairly straightforward to decode, so this is a more complex, but | |
| 26 * still palatable example of an SDL_sound decoder. Y'know, in case the | |
| 27 * RAW decoder didn't do it for you. :) | |
| 28 * | |
| 29 * This code was ripped from a decoder I had written for SDL_mixer, which was | |
| 30 * largely ripped from sox v12.17.1's voc.c. | |
| 31 * | |
| 32 * SDL_mixer: http://www.libsdl.org/projects/SDL_mixer/ | |
| 33 * sox: http://www.freshmeat.net/projects/sox/ | |
| 34 * | |
|
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35 * Please see the file COPYING in the source's root directory. |
| 14 | 36 * |
| 37 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org) | |
| 38 */ | |
| 39 | |
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40 #if HAVE_CONFIG_H |
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41 # include <config.h> |
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42 #endif |
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43 |
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44 #ifdef SOUND_SUPPORTS_VOC |
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45 |
| 14 | 46 #include <stdio.h> |
| 47 #include <stdlib.h> | |
| 48 #include <string.h> | |
| 49 | |
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50 #include "SDL_sound.h" |
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51 |
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52 #define __SDL_SOUND_INTERNAL__ |
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53 #include "SDL_sound_internal.h" |
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54 |
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55 static int VOC_init(void); |
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56 static void VOC_quit(void); |
| 14 | 57 static int VOC_open(Sound_Sample *sample, const char *ext); |
| 58 static void VOC_close(Sound_Sample *sample); | |
| 59 static Uint32 VOC_read(Sound_Sample *sample); | |
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60 static int VOC_rewind(Sound_Sample *sample); |
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61 static int VOC_seek(Sound_Sample *sample, Uint32 ms); |
| 14 | 62 |
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63 static const char *extensions_voc[] = { "VOC", NULL }; |
| 14 | 64 const Sound_DecoderFunctions __Sound_DecoderFunctions_VOC = |
| 65 { | |
| 66 { | |
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67 extensions_voc, |
| 14 | 68 "Creative Labs Voice format", |
| 69 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
| 70 "http://www.icculus.org/SDL_sound/" | |
| 71 }, | |
| 72 | |
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73 VOC_init, /* init() method */ |
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74 VOC_quit, /* quit() method */ |
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75 VOC_open, /* open() method */ |
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76 VOC_close, /* close() method */ |
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77 VOC_read, /* read() method */ |
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78 VOC_rewind, /* rewind() method */ |
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79 VOC_seek /* seek() method */ |
| 14 | 80 }; |
| 81 | |
| 82 | |
| 83 /* Private data for VOC file */ | |
| 84 typedef struct vocstuff { | |
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85 Uint32 rest; /* bytes remaining in current block */ |
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86 Uint32 rate; /* rate code (byte) of this chunk */ |
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87 int silent; /* sound or silence? */ |
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88 Uint32 srate; /* rate code (byte) of silence */ |
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89 Uint32 blockseek; /* start of current output block */ |
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90 Uint32 samples; /* number of samples output */ |
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91 Uint32 size; /* word length of data */ |
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92 Uint8 channels; /* number of sound channels */ |
| 14 | 93 int extended; /* Has an extended block been read? */ |
| 94 Uint32 bufpos; /* byte position in internal->buffer. */ | |
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95 Uint32 start_pos; /* offset to seek to in stream when rewinding. */ |
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96 int error; /* error condition (as opposed to EOF). */ |
| 14 | 97 } vs_t; |
| 98 | |
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99 |
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100 /* Size field */ |
| 14 | 101 /* SJB: note that the 1st 3 are sometimes used as sizeof(type) */ |
| 102 #define ST_SIZE_BYTE 1 | |
| 103 #define ST_SIZE_8BIT 1 | |
| 104 #define ST_SIZE_WORD 2 | |
| 105 #define ST_SIZE_16BIT 2 | |
| 106 #define ST_SIZE_DWORD 4 | |
| 107 #define ST_SIZE_32BIT 4 | |
| 108 #define ST_SIZE_FLOAT 5 | |
| 109 #define ST_SIZE_DOUBLE 6 | |
| 110 #define ST_SIZE_IEEE 7 /* IEEE 80-bit floats. */ | |
| 111 | |
| 112 /* Style field */ | |
| 113 #define ST_ENCODING_UNSIGNED 1 /* unsigned linear: Sound Blaster */ | |
| 114 #define ST_ENCODING_SIGN2 2 /* signed linear 2's comp: Mac */ | |
| 115 #define ST_ENCODING_ULAW 3 /* U-law signed logs: US telephony, SPARC */ | |
| 116 #define ST_ENCODING_ALAW 4 /* A-law signed logs: non-US telephony */ | |
| 117 #define ST_ENCODING_ADPCM 5 /* Compressed PCM */ | |
| 118 #define ST_ENCODING_IMA_ADPCM 6 /* Compressed PCM */ | |
| 119 #define ST_ENCODING_GSM 7 /* GSM 6.10 33-byte frame lossy compression */ | |
| 120 | |
| 121 #define VOC_TERM 0 | |
| 122 #define VOC_DATA 1 | |
| 123 #define VOC_CONT 2 | |
| 124 #define VOC_SILENCE 3 | |
| 125 #define VOC_MARKER 4 | |
| 126 #define VOC_TEXT 5 | |
| 127 #define VOC_LOOP 6 | |
| 128 #define VOC_LOOPEND 7 | |
| 129 #define VOC_EXTENDED 8 | |
| 130 #define VOC_DATA_16 9 | |
| 131 | |
| 132 | |
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133 static int VOC_init(void) |
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134 { |
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135 return(1); /* always succeeds. */ |
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136 } /* VOC_init */ |
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137 |
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138 |
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139 static void VOC_quit(void) |
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140 { |
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141 /* it's a no-op. */ |
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142 } /* VOC_quit */ |
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143 |
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144 |
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145 static inline int voc_readbytes(SDL_RWops *src, vs_t *v, void *p, int size) |
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146 { |
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147 if (SDL_RWread(src, p, size, 1) != 1) |
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148 { |
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149 Sound_SetError("VOC: i/o error"); |
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150 v->error = 1; |
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151 return 0; |
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152 } /* if */ |
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153 |
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154 return(1); |
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155 } /* voc_readbytes */ |
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156 |
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157 |
| 301 | 158 static inline int voc_check_header(SDL_RWops *src) |
| 14 | 159 { |
| 160 /* VOC magic header */ | |
| 161 Uint8 signature[20]; /* "Creative Voice File\032" */ | |
| 162 Uint16 datablockofs; | |
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163 vs_t v; /* dummy struct for voc_readbytes */ |
| 14 | 164 |
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165 if (!voc_readbytes(src, &v, signature, sizeof (signature))) |
| 14 | 166 return(0); |
| 167 | |
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168 if (memcmp(signature, "Creative Voice File\032", sizeof (signature)) != 0) |
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169 { |
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170 Sound_SetError("VOC: Wrong signature; not a VOC file."); |
| 14 | 171 return(0); |
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172 } /* if */ |
| 14 | 173 |
| 174 /* get the offset where the first datablock is located */ | |
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175 if (!voc_readbytes(src, &v, &datablockofs, sizeof (Uint16))) |
| 14 | 176 return(0); |
| 177 | |
| 178 datablockofs = SDL_SwapLE16(datablockofs); | |
| 179 | |
| 180 if (SDL_RWseek(src, datablockofs, SEEK_SET) != datablockofs) | |
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181 { |
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182 Sound_SetError("VOC: Failed to seek to data block."); |
| 14 | 183 return(0); |
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184 } /* if */ |
| 14 | 185 |
| 186 return(1); /* success! */ | |
| 187 } /* voc_check_header */ | |
| 188 | |
| 189 | |
| 190 /* Read next block header, save info, leave position at start of data */ | |
| 191 static int voc_get_block(Sound_Sample *sample) | |
| 192 { | |
| 193 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 194 SDL_RWops *src = internal->rw; | |
| 195 vs_t *v = (vs_t *) internal->decoder_private; | |
| 196 Uint8 bits24[3]; | |
| 197 Uint8 uc, block; | |
| 198 Uint32 sblen; | |
| 199 Uint16 new_rate_short; | |
| 200 Uint32 new_rate_long; | |
| 201 Uint8 trash[6]; | |
| 202 Uint16 period; | |
| 203 int i; | |
| 204 | |
| 205 v->silent = 0; | |
| 206 while (v->rest == 0) | |
| 207 { | |
| 208 if (SDL_RWread(src, &block, sizeof (block), 1) != 1) | |
| 209 return 1; /* assume that's the end of the file. */ | |
| 210 | |
| 211 if (block == VOC_TERM) | |
| 212 return 1; | |
| 213 | |
| 214 if (SDL_RWread(src, bits24, sizeof (bits24), 1) != 1) | |
| 215 return 1; /* assume that's the end of the file. */ | |
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216 |
| 14 | 217 /* Size is an 24-bit value. Ugh. */ |
| 218 sblen = ( (bits24[0]) | (bits24[1] << 8) | (bits24[2] << 16) ); | |
| 219 | |
| 220 switch(block) | |
| 221 { | |
| 222 case VOC_DATA: | |
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223 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
| 14 | 224 return 0; |
| 225 | |
| 226 /* When DATA block preceeded by an EXTENDED */ | |
| 227 /* block, the DATA blocks rate value is invalid */ | |
| 228 if (!v->extended) | |
| 229 { | |
| 230 if (uc == 0) | |
| 231 { | |
| 232 Sound_SetError("VOC Sample rate is zero?"); | |
| 233 return 0; | |
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234 } /* if */ |
| 14 | 235 |
| 236 if ((v->rate != -1) && (uc != v->rate)) | |
| 237 { | |
| 238 Sound_SetError("VOC sample rate codes differ"); | |
| 239 return 0; | |
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240 } /* if */ |
| 14 | 241 |
| 242 v->rate = uc; | |
| 243 sample->actual.rate = 1000000.0/(256 - v->rate); | |
| 244 v->channels = 1; | |
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245 } /* if */ |
| 14 | 246 |
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247 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
| 14 | 248 return 0; |
| 249 | |
| 250 if (uc != 0) | |
| 251 { | |
| 252 Sound_SetError("VOC decoder only interprets 8-bit data"); | |
| 253 return 0; | |
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254 } /* if */ |
| 14 | 255 |
| 256 v->extended = 0; | |
| 257 v->rest = sblen - 2; | |
| 258 v->size = ST_SIZE_BYTE; | |
| 259 return 1; | |
| 260 | |
| 261 case VOC_DATA_16: | |
|
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262 if (!voc_readbytes(src, v, &new_rate_long, sizeof (Uint32))) |
| 14 | 263 return 0; |
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264 |
| 14 | 265 new_rate_long = SDL_SwapLE32(new_rate_long); |
| 266 if (new_rate_long == 0) | |
| 267 { | |
| 268 Sound_SetError("VOC Sample rate is zero?"); | |
| 269 return 0; | |
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270 } /* if */ |
| 14 | 271 if ((v->rate != -1) && (new_rate_long != v->rate)) |
| 272 { | |
| 273 Sound_SetError("VOC sample rate codes differ"); | |
| 274 return 0; | |
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275 } /* if */ |
| 14 | 276 v->rate = new_rate_long; |
| 277 sample->actual.rate = new_rate_long; | |
| 278 | |
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279 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
| 14 | 280 return 0; |
| 281 | |
| 282 switch (uc) | |
| 283 { | |
| 284 case 8: v->size = ST_SIZE_BYTE; break; | |
| 285 case 16: v->size = ST_SIZE_WORD; break; | |
| 286 default: | |
| 287 Sound_SetError("VOC with unknown data size"); | |
| 288 return 0; | |
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289 } /* switch */ |
| 14 | 290 |
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291 if (!voc_readbytes(src, v, &v->channels, sizeof (Uint8))) |
| 14 | 292 return 0; |
| 293 | |
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294 if (!voc_readbytes(src, v, trash, sizeof (Uint8) * 6)) |
| 14 | 295 return 0; |
| 296 | |
| 297 v->rest = sblen - 12; | |
| 298 return 1; | |
| 299 | |
| 300 case VOC_CONT: | |
| 301 v->rest = sblen; | |
| 302 return 1; | |
| 303 | |
| 304 case VOC_SILENCE: | |
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305 if (!voc_readbytes(src, v, &period, sizeof (period))) |
| 14 | 306 return 0; |
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307 |
| 14 | 308 period = SDL_SwapLE16(period); |
| 309 | |
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310 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
| 14 | 311 return 0; |
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312 |
| 14 | 313 if (uc == 0) |
| 314 { | |
| 315 Sound_SetError("VOC silence sample rate is zero"); | |
| 316 return 0; | |
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317 } /* if */ |
| 14 | 318 |
| 319 /* | |
| 320 * Some silence-packed files have gratuitously | |
| 321 * different sample rate codes in silence. | |
| 322 * Adjust period. | |
| 323 */ | |
| 324 if ((v->rate != -1) && (uc != v->rate)) | |
| 325 period = (period * (256 - uc))/(256 - v->rate); | |
| 326 else | |
| 327 v->rate = uc; | |
| 328 v->rest = period; | |
| 329 v->silent = 1; | |
| 330 return 1; | |
| 331 | |
| 332 case VOC_LOOP: | |
| 333 case VOC_LOOPEND: | |
| 334 for(i = 0; i < sblen; i++) /* skip repeat loops. */ | |
| 335 { | |
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336 if (!voc_readbytes(src, v, trash, sizeof (Uint8))) |
| 14 | 337 return 0; |
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338 } /* for */ |
| 14 | 339 break; |
| 340 | |
| 341 case VOC_EXTENDED: | |
| 342 /* An Extended block is followed by a data block */ | |
| 343 /* Set this byte so we know to use the rate */ | |
| 344 /* value from the extended block and not the */ | |
| 345 /* data block. */ | |
| 346 v->extended = 1; | |
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347 if (!voc_readbytes(src, v, &new_rate_short, sizeof (Uint16))) |
| 14 | 348 return 0; |
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349 |
| 14 | 350 new_rate_short = SDL_SwapLE16(new_rate_short); |
| 351 if (new_rate_short == 0) | |
| 352 { | |
| 353 Sound_SetError("VOC sample rate is zero"); | |
| 354 return 0; | |
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355 } /* if */ |
| 14 | 356 if ((v->rate != -1) && (new_rate_short != v->rate)) |
| 357 { | |
| 358 Sound_SetError("VOC sample rate codes differ"); | |
| 359 return 0; | |
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360 } /* if */ |
| 14 | 361 v->rate = new_rate_short; |
| 362 | |
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363 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
| 14 | 364 return 0; |
| 365 | |
| 366 if (uc != 0) | |
| 367 { | |
| 368 Sound_SetError("VOC decoder only interprets 8-bit data"); | |
| 369 return 0; | |
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370 } /* if */ |
| 14 | 371 |
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372 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
| 14 | 373 return 0; |
| 374 | |
| 375 if (uc) | |
| 376 sample->actual.channels = 2; /* Stereo */ | |
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377 |
| 14 | 378 /* Needed number of channels before finishing |
| 379 compute for rate */ | |
| 380 sample->actual.rate = | |
| 381 (256000000L/(65536L - v->rate)) / sample->actual.channels; | |
| 382 /* An extended block must be followed by a data */ | |
| 383 /* block to be valid so loop back to top so it */ | |
| 384 /* can be grabed. */ | |
| 385 continue; | |
| 386 | |
| 387 case VOC_MARKER: | |
|
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388 if (!voc_readbytes(src, v, trash, sizeof (Uint8) * 2)) |
| 14 | 389 return 0; |
| 390 | |
| 391 /* Falling! Falling! */ | |
| 392 | |
| 393 default: /* text block or other krapola. */ | |
|
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394 if (!voc_readbytes(src, v, &trash, sizeof (Uint8) * sblen)) |
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395 return 0; |
| 14 | 396 |
| 397 if (block == VOC_TEXT) | |
| 398 continue; /* get next block */ | |
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399 } /* switch */ |
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400 } /* while */ |
| 14 | 401 |
| 402 return 1; | |
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403 } /* voc_get_block */ |
| 14 | 404 |
| 405 | |
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406 static int voc_read_waveform(Sound_Sample *sample, int fill_buf, Uint32 max) |
| 14 | 407 { |
| 408 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 409 SDL_RWops *src = internal->rw; | |
| 410 vs_t *v = (vs_t *) internal->decoder_private; | |
| 411 int done = 0; | |
| 412 Uint8 silence = 0x80; | |
| 413 Uint8 *buf = internal->buffer; | |
| 414 | |
| 415 if (v->rest == 0) | |
| 416 { | |
| 417 if (!voc_get_block(sample)) | |
| 418 return 0; | |
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419 } /* if */ |
| 14 | 420 |
| 421 if (v->rest == 0) | |
| 422 return 0; | |
| 423 | |
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424 max = (v->rest < max) ? v->rest : max; |
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425 |
| 14 | 426 if (v->silent) |
| 427 { | |
| 428 if (v->size == ST_SIZE_WORD) | |
| 429 silence = 0x00; | |
| 430 | |
| 431 /* Fill in silence */ | |
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432 if (fill_buf) |
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433 memset(buf + v->bufpos, silence, max); |
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434 |
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435 done = max; |
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436 v->rest -= done; |
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437 } /* if */ |
| 14 | 438 |
| 439 else | |
| 440 { | |
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441 if (fill_buf) |
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442 { |
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443 done = SDL_RWread(src, buf + v->bufpos, 1, max); |
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444 if (done < max) |
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445 { |
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446 Sound_SetError("VOC: i/o error"); |
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447 sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
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448 } /* if */ |
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449 } /* if */ |
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450 |
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451 else |
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452 { |
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453 int cur, rc; |
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454 cur = SDL_RWtell(src); |
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455 if (cur >= 0) |
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456 { |
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457 rc = SDL_RWseek(src, max, SEEK_CUR); |
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458 if (rc >= 0) |
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459 done = rc - cur; |
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460 else |
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461 { |
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462 Sound_SetError("VOC: seek error"); |
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463 sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
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464 } /* else */ |
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465 } /* if */ |
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466 } /* else */ |
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467 |
| 14 | 468 v->rest -= done; |
| 469 v->bufpos += done; | |
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470 } /* else */ |
| 14 | 471 |
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472 return(done); |
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473 } /* voc_read_waveform */ |
| 14 | 474 |
| 475 | |
| 476 static int VOC_open(Sound_Sample *sample, const char *ext) | |
| 477 { | |
| 478 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 479 vs_t *v = NULL; | |
| 480 | |
| 481 if (!voc_check_header(internal->rw)) | |
| 482 return(0); | |
| 483 | |
| 484 v = (vs_t *) malloc(sizeof (vs_t)); | |
| 485 BAIL_IF_MACRO(v == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 486 memset(v, '\0', sizeof (vs_t)); | |
| 487 internal->decoder_private = v; | |
| 488 | |
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489 v->start_pos = SDL_RWtell(internal->rw); |
| 14 | 490 v->rate = -1; |
| 491 if (!voc_get_block(sample)) | |
| 492 { | |
| 493 free(v); | |
| 494 return(0); | |
| 495 } /* if */ | |
| 496 | |
| 497 if (v->rate == -1) | |
| 498 { | |
| 499 Sound_SetError("VOC data had no sound!"); | |
| 500 free(v); | |
| 501 return(0); | |
| 502 } /* if */ | |
| 503 | |
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504 SNDDBG(("VOC: Accepting data stream.\n")); |
| 14 | 505 sample->actual.format = (v->size == ST_SIZE_WORD) ? AUDIO_S16LSB:AUDIO_U8; |
| 506 sample->actual.channels = v->channels; | |
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507 sample->flags = SOUND_SAMPLEFLAG_CANSEEK; |
| 14 | 508 return(1); |
| 509 } /* VOC_open */ | |
| 510 | |
| 511 | |
| 512 static void VOC_close(Sound_Sample *sample) | |
| 513 { | |
| 514 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 515 free(internal->decoder_private); | |
| 516 } /* VOC_close */ | |
| 517 | |
| 518 | |
| 519 static Uint32 VOC_read(Sound_Sample *sample) | |
| 520 { | |
| 521 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 522 vs_t *v = (vs_t *) internal->decoder_private; | |
| 523 | |
| 524 v->bufpos = 0; | |
| 525 while (v->bufpos < internal->buffer_size) | |
| 526 { | |
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527 Uint32 rc = voc_read_waveform(sample, 1, internal->buffer_size); |
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528 if (rc == 0) |
| 14 | 529 { |
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530 sample->flags |= (v->error) ? |
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531 SOUND_SAMPLEFLAG_ERROR : |
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532 SOUND_SAMPLEFLAG_EOF; |
| 14 | 533 break; |
| 534 } /* if */ | |
| 535 | |
| 536 if (!voc_get_block(sample)) | |
| 537 { | |
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538 sample->flags |= (v->error) ? |
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539 SOUND_SAMPLEFLAG_ERROR : |
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540 SOUND_SAMPLEFLAG_EOF; |
| 14 | 541 break; |
| 542 } /* if */ | |
| 543 } /* while */ | |
| 544 | |
| 545 return(v->bufpos); | |
| 546 } /* VOC_read */ | |
| 547 | |
|
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548 |
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549 static int VOC_rewind(Sound_Sample *sample) |
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550 { |
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224
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551 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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552 vs_t *v = (vs_t *) internal->decoder_private; |
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553 int rc = SDL_RWseek(internal->rw, v->start_pos, SEEK_SET); |
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554 BAIL_IF_MACRO(rc != v->start_pos, ERR_IO_ERROR, 0); |
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555 v->rest = 0; |
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556 return(1); |
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557 } /* VOC_rewind */ |
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558 |
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559 |
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560 static int VOC_seek(Sound_Sample *sample, Uint32 ms) |
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561 { |
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562 /* |
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563 * VOCs don't lend themselves well to seeking, since you have to |
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564 * parse each section, which is an arbitrary size. The best we can do |
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565 * is rewind, set a flag saying not to write the waveforms to a buffer, |
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566 * and decode to the point that we want. Ugh. Fortunately, there's |
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567 * really no such thing as a large VOC, due to the era and hardware that |
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568 * spawned them, so even though this is inefficient, this is still a |
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569 * relatively fast operation in most cases. |
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570 */ |
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571 |
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572 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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573 vs_t *v = (vs_t *) internal->decoder_private; |
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574 int offset = __Sound_convertMsToBytePos(&sample->actual, ms); |
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575 int origpos = SDL_RWtell(internal->rw); |
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576 int origrest = v->rest; |
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577 |
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578 BAIL_IF_MACRO(!VOC_rewind(sample), NULL, 0); |
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579 |
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580 v->bufpos = 0; |
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581 |
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582 while (offset > 0) |
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583 { |
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584 Uint32 rc = voc_read_waveform(sample, 0, offset); |
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585 if ( (rc == 0) || (!voc_get_block(sample)) ) |
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586 { |
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587 SDL_RWseek(internal->rw, origpos, SEEK_SET); |
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588 v->rest = origrest; |
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589 return(0); |
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590 } /* if */ |
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591 |
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592 offset -= rc; |
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593 } /* while */ |
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594 |
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595 return(1); |
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596 } /* VOC_seek */ |
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597 |
|
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598 #endif /* SOUND_SUPPORTS_VOC */ |
| 14 | 599 |
| 600 /* end of voc.c ... */ |