Mercurial > SDL_sound_CoreAudio
annotate decoders/voc.c @ 507:7f11a82e918e stable-1.0
Whoops, didn't actually fix the gcc4 warnings (backport from devbranch).
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sat, 17 Dec 2005 18:50:17 +0000 |
| parents | 3f03af31e246 |
| children | 50bb9a6cebfe |
| 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 v->error = 1; |
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150 BAIL_MACRO("VOC: i/o error", 0); |
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151 } /* if */ |
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152 |
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153 return(1); |
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154 } /* voc_readbytes */ |
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155 |
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156 |
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157 static __inline__ int voc_check_header(SDL_RWops *src) |
| 14 | 158 { |
| 159 /* VOC magic header */ | |
| 160 Uint8 signature[20]; /* "Creative Voice File\032" */ | |
| 161 Uint16 datablockofs; | |
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162 vs_t v; /* dummy struct for voc_readbytes */ |
| 14 | 163 |
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164 if (!voc_readbytes(src, &v, signature, sizeof (signature))) |
| 14 | 165 return(0); |
| 166 | |
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167 if (memcmp(signature, "Creative Voice File\032", sizeof (signature)) != 0) |
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168 { |
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169 BAIL_MACRO("VOC: Wrong signature; not a VOC file.", 0); |
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170 } /* if */ |
| 14 | 171 |
| 172 /* get the offset where the first datablock is located */ | |
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173 if (!voc_readbytes(src, &v, &datablockofs, sizeof (Uint16))) |
| 14 | 174 return(0); |
| 175 | |
| 176 datablockofs = SDL_SwapLE16(datablockofs); | |
| 177 | |
| 178 if (SDL_RWseek(src, datablockofs, SEEK_SET) != datablockofs) | |
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179 { |
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180 BAIL_MACRO("VOC: Failed to seek to data block.", 0); |
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181 } /* if */ |
| 14 | 182 |
| 183 return(1); /* success! */ | |
| 184 } /* voc_check_header */ | |
| 185 | |
| 186 | |
| 187 /* Read next block header, save info, leave position at start of data */ | |
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188 static int voc_get_block(Sound_Sample *sample, vs_t *v) |
| 14 | 189 { |
| 190 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 191 SDL_RWops *src = internal->rw; | |
| 192 Uint8 bits24[3]; | |
| 193 Uint8 uc, block; | |
| 194 Uint32 sblen; | |
| 195 Uint16 new_rate_short; | |
| 196 Uint32 new_rate_long; | |
| 197 Uint8 trash[6]; | |
| 198 Uint16 period; | |
| 199 int i; | |
| 200 | |
| 201 v->silent = 0; | |
| 202 while (v->rest == 0) | |
| 203 { | |
| 204 if (SDL_RWread(src, &block, sizeof (block), 1) != 1) | |
| 205 return 1; /* assume that's the end of the file. */ | |
| 206 | |
| 207 if (block == VOC_TERM) | |
| 208 return 1; | |
| 209 | |
| 210 if (SDL_RWread(src, bits24, sizeof (bits24), 1) != 1) | |
| 211 return 1; /* assume that's the end of the file. */ | |
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212 |
| 14 | 213 /* Size is an 24-bit value. Ugh. */ |
| 214 sblen = ( (bits24[0]) | (bits24[1] << 8) | (bits24[2] << 16) ); | |
| 215 | |
| 216 switch(block) | |
| 217 { | |
| 218 case VOC_DATA: | |
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219 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
| 14 | 220 return 0; |
| 221 | |
| 222 /* When DATA block preceeded by an EXTENDED */ | |
| 223 /* block, the DATA blocks rate value is invalid */ | |
| 224 if (!v->extended) | |
| 225 { | |
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226 BAIL_IF_MACRO(uc == 0, "VOC: Sample rate is zero?", 0); |
| 14 | 227 |
| 228 if ((v->rate != -1) && (uc != v->rate)) | |
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229 BAIL_MACRO("VOC sample rate codes differ", 0); |
| 14 | 230 |
| 231 v->rate = uc; | |
| 481 | 232 v->channels = 1; |
| 14 | 233 sample->actual.rate = 1000000.0/(256 - v->rate); |
| 481 | 234 sample->actual.channels = 1; |
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235 } /* if */ |
| 14 | 236 |
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237 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
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238 return(0); |
| 14 | 239 |
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240 BAIL_IF_MACRO(uc != 0, "VOC: only supports 8-bit data", 0); |
| 14 | 241 |
| 242 v->extended = 0; | |
| 243 v->rest = sblen - 2; | |
| 244 v->size = ST_SIZE_BYTE; | |
| 245 return 1; | |
| 246 | |
| 247 case VOC_DATA_16: | |
|
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248 if (!voc_readbytes(src, v, &new_rate_long, sizeof (Uint32))) |
| 14 | 249 return 0; |
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250 |
| 14 | 251 new_rate_long = SDL_SwapLE32(new_rate_long); |
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252 BAIL_IF_MACRO(!new_rate_long, "VOC: Sample rate is zero?", 0); |
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253 |
| 14 | 254 if ((v->rate != -1) && (new_rate_long != v->rate)) |
|
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255 BAIL_MACRO("VOC: sample rate codes differ", 0); |
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256 |
| 14 | 257 v->rate = new_rate_long; |
| 258 sample->actual.rate = new_rate_long; | |
| 259 | |
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260 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
| 14 | 261 return 0; |
| 262 | |
| 263 switch (uc) | |
| 264 { | |
| 265 case 8: v->size = ST_SIZE_BYTE; break; | |
| 266 case 16: v->size = ST_SIZE_WORD; break; | |
| 267 default: | |
|
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268 BAIL_MACRO("VOC: unknown data size", 0); |
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269 } /* switch */ |
| 14 | 270 |
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271 if (!voc_readbytes(src, v, &v->channels, sizeof (Uint8))) |
| 14 | 272 return 0; |
| 273 | |
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274 if (!voc_readbytes(src, v, trash, sizeof (Uint8) * 6)) |
| 14 | 275 return 0; |
| 276 | |
| 277 v->rest = sblen - 12; | |
| 278 return 1; | |
| 279 | |
| 280 case VOC_CONT: | |
| 281 v->rest = sblen; | |
| 282 return 1; | |
| 283 | |
| 284 case VOC_SILENCE: | |
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285 if (!voc_readbytes(src, v, &period, sizeof (period))) |
| 14 | 286 return 0; |
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287 |
| 14 | 288 period = SDL_SwapLE16(period); |
| 289 | |
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290 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
| 14 | 291 return 0; |
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292 |
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293 BAIL_IF_MACRO(uc == 0, "VOC: silence sample rate is zero", 0); |
| 14 | 294 |
| 295 /* | |
| 296 * Some silence-packed files have gratuitously | |
| 297 * different sample rate codes in silence. | |
| 298 * Adjust period. | |
| 299 */ | |
| 300 if ((v->rate != -1) && (uc != v->rate)) | |
| 301 period = (period * (256 - uc))/(256 - v->rate); | |
| 302 else | |
| 303 v->rate = uc; | |
| 304 v->rest = period; | |
| 305 v->silent = 1; | |
| 306 return 1; | |
| 307 | |
| 308 case VOC_LOOP: | |
| 309 case VOC_LOOPEND: | |
| 310 for(i = 0; i < sblen; i++) /* skip repeat loops. */ | |
| 311 { | |
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312 if (!voc_readbytes(src, v, trash, sizeof (Uint8))) |
| 14 | 313 return 0; |
|
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314 } /* for */ |
| 14 | 315 break; |
| 316 | |
| 317 case VOC_EXTENDED: | |
| 318 /* An Extended block is followed by a data block */ | |
| 319 /* Set this byte so we know to use the rate */ | |
| 320 /* value from the extended block and not the */ | |
| 321 /* data block. */ | |
| 322 v->extended = 1; | |
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323 if (!voc_readbytes(src, v, &new_rate_short, sizeof (Uint16))) |
| 14 | 324 return 0; |
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325 |
| 14 | 326 new_rate_short = SDL_SwapLE16(new_rate_short); |
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327 BAIL_IF_MACRO(!new_rate_short, "VOC: sample rate is zero", 0); |
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328 |
| 14 | 329 if ((v->rate != -1) && (new_rate_short != v->rate)) |
|
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330 BAIL_MACRO("VOC: sample rate codes differ", 0); |
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331 |
| 14 | 332 v->rate = new_rate_short; |
| 333 | |
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334 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
| 14 | 335 return 0; |
| 336 | |
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337 BAIL_IF_MACRO(uc != 0, "VOC: only supports 8-bit data", 0); |
| 14 | 338 |
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339 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
| 14 | 340 return 0; |
| 341 | |
| 342 if (uc) | |
| 343 sample->actual.channels = 2; /* Stereo */ | |
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344 |
| 14 | 345 /* Needed number of channels before finishing |
| 346 compute for rate */ | |
| 347 sample->actual.rate = | |
| 348 (256000000L/(65536L - v->rate)) / sample->actual.channels; | |
| 349 /* An extended block must be followed by a data */ | |
| 350 /* block to be valid so loop back to top so it */ | |
| 351 /* can be grabed. */ | |
| 352 continue; | |
| 353 | |
| 354 case VOC_MARKER: | |
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355 if (!voc_readbytes(src, v, trash, sizeof (Uint8) * 2)) |
| 14 | 356 return 0; |
| 357 | |
| 358 /* Falling! Falling! */ | |
| 359 | |
| 360 default: /* text block or other krapola. */ | |
|
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361 for(i = 0; i < sblen; i++) /* skip repeat loops. */ |
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362 { |
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363 if (!voc_readbytes(src, v, trash, sizeof (Uint8))) |
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364 return 0; |
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365 } /* for */ |
| 14 | 366 |
| 367 if (block == VOC_TEXT) | |
| 368 continue; /* get next block */ | |
|
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369 } /* switch */ |
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370 } /* while */ |
| 14 | 371 |
| 372 return 1; | |
|
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373 } /* voc_get_block */ |
| 14 | 374 |
| 375 | |
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376 static int voc_read_waveform(Sound_Sample *sample, int fill_buf, Uint32 max) |
| 14 | 377 { |
| 378 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 379 SDL_RWops *src = internal->rw; | |
| 380 vs_t *v = (vs_t *) internal->decoder_private; | |
| 381 int done = 0; | |
| 382 Uint8 silence = 0x80; | |
| 383 Uint8 *buf = internal->buffer; | |
| 384 | |
| 385 if (v->rest == 0) | |
| 386 { | |
|
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387 if (!voc_get_block(sample, v)) |
| 14 | 388 return 0; |
|
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389 } /* if */ |
| 14 | 390 |
| 391 if (v->rest == 0) | |
| 392 return 0; | |
| 393 | |
|
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394 max = (v->rest < max) ? v->rest : max; |
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395 |
| 14 | 396 if (v->silent) |
| 397 { | |
| 398 if (v->size == ST_SIZE_WORD) | |
| 399 silence = 0x00; | |
| 400 | |
| 401 /* Fill in silence */ | |
|
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402 if (fill_buf) |
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403 memset(buf + v->bufpos, silence, max); |
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404 |
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405 done = max; |
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406 v->rest -= done; |
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407 } /* if */ |
| 14 | 408 |
| 409 else | |
| 410 { | |
|
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411 if (fill_buf) |
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412 { |
|
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413 done = SDL_RWread(src, buf + v->bufpos, 1, max); |
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414 if (done < max) |
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415 { |
|
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416 __Sound_SetError("VOC: i/o error"); |
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417 sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
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418 } /* if */ |
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419 } /* if */ |
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420 |
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421 else |
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422 { |
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423 int cur, rc; |
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424 cur = SDL_RWtell(src); |
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425 if (cur >= 0) |
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426 { |
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427 rc = SDL_RWseek(src, max, SEEK_CUR); |
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428 if (rc >= 0) |
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429 done = rc - cur; |
|
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430 else |
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431 { |
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432 __Sound_SetError("VOC: seek error"); |
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433 sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
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434 } /* else */ |
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435 } /* if */ |
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436 } /* else */ |
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437 |
| 14 | 438 v->rest -= done; |
| 439 v->bufpos += done; | |
|
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440 } /* else */ |
| 14 | 441 |
|
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442 return(done); |
|
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443 } /* voc_read_waveform */ |
| 14 | 444 |
| 445 | |
| 446 static int VOC_open(Sound_Sample *sample, const char *ext) | |
| 447 { | |
| 448 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 449 vs_t *v = NULL; | |
| 450 | |
| 451 if (!voc_check_header(internal->rw)) | |
| 452 return(0); | |
| 453 | |
| 454 v = (vs_t *) malloc(sizeof (vs_t)); | |
| 455 BAIL_IF_MACRO(v == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 456 memset(v, '\0', sizeof (vs_t)); | |
| 457 | |
|
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458 v->start_pos = SDL_RWtell(internal->rw); |
| 14 | 459 v->rate = -1; |
|
468
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460 if (!voc_get_block(sample, v)) |
| 14 | 461 { |
| 462 free(v); | |
| 463 return(0); | |
| 464 } /* if */ | |
| 465 | |
| 466 if (v->rate == -1) | |
| 467 { | |
| 468 free(v); | |
|
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469 BAIL_MACRO("VOC: data had no sound!", 0); |
| 14 | 470 } /* if */ |
| 471 | |
|
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472 SNDDBG(("VOC: Accepting data stream.\n")); |
| 14 | 473 sample->actual.format = (v->size == ST_SIZE_WORD) ? AUDIO_S16LSB:AUDIO_U8; |
| 474 sample->actual.channels = v->channels; | |
|
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475 sample->flags = SOUND_SAMPLEFLAG_CANSEEK; |
|
449
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476 internal->decoder_private = v; |
| 14 | 477 return(1); |
| 478 } /* VOC_open */ | |
| 479 | |
| 480 | |
| 481 static void VOC_close(Sound_Sample *sample) | |
| 482 { | |
| 483 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 484 free(internal->decoder_private); | |
| 485 } /* VOC_close */ | |
| 486 | |
| 487 | |
| 488 static Uint32 VOC_read(Sound_Sample *sample) | |
| 489 { | |
| 490 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 491 vs_t *v = (vs_t *) internal->decoder_private; | |
| 492 | |
| 493 v->bufpos = 0; | |
| 494 while (v->bufpos < internal->buffer_size) | |
| 495 { | |
|
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496 Uint32 rc = voc_read_waveform(sample, 1, internal->buffer_size); |
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497 if (rc == 0) |
| 14 | 498 { |
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499 sample->flags |= (v->error) ? |
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500 SOUND_SAMPLEFLAG_ERROR : |
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501 SOUND_SAMPLEFLAG_EOF; |
| 14 | 502 break; |
| 503 } /* if */ | |
| 504 | |
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505 if (!voc_get_block(sample, v)) |
| 14 | 506 { |
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507 sample->flags |= (v->error) ? |
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508 SOUND_SAMPLEFLAG_ERROR : |
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509 SOUND_SAMPLEFLAG_EOF; |
| 14 | 510 break; |
| 511 } /* if */ | |
| 512 } /* while */ | |
| 513 | |
| 514 return(v->bufpos); | |
| 515 } /* VOC_read */ | |
| 516 | |
|
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517 |
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518 static int VOC_rewind(Sound_Sample *sample) |
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519 { |
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520 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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521 vs_t *v = (vs_t *) internal->decoder_private; |
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522 int rc = SDL_RWseek(internal->rw, v->start_pos, SEEK_SET); |
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523 BAIL_IF_MACRO(rc != v->start_pos, ERR_IO_ERROR, 0); |
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524 v->rest = 0; |
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525 return(1); |
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526 } /* VOC_rewind */ |
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527 |
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528 |
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529 static int VOC_seek(Sound_Sample *sample, Uint32 ms) |
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530 { |
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531 /* |
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532 * VOCs don't lend themselves well to seeking, since you have to |
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533 * parse each section, which is an arbitrary size. The best we can do |
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534 * is rewind, set a flag saying not to write the waveforms to a buffer, |
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535 * and decode to the point that we want. Ugh. Fortunately, there's |
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536 * really no such thing as a large VOC, due to the era and hardware that |
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537 * spawned them, so even though this is inefficient, this is still a |
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538 * relatively fast operation in most cases. |
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539 */ |
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540 |
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541 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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542 vs_t *v = (vs_t *) internal->decoder_private; |
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543 int offset = __Sound_convertMsToBytePos(&sample->actual, ms); |
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544 int origpos = SDL_RWtell(internal->rw); |
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545 int origrest = v->rest; |
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546 |
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547 BAIL_IF_MACRO(!VOC_rewind(sample), NULL, 0); |
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548 |
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549 v->bufpos = 0; |
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550 |
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551 while (offset > 0) |
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552 { |
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553 Uint32 rc = voc_read_waveform(sample, 0, offset); |
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554 if ( (rc == 0) || (!voc_get_block(sample, v)) ) |
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555 { |
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556 SDL_RWseek(internal->rw, origpos, SEEK_SET); |
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557 v->rest = origrest; |
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558 return(0); |
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559 } /* if */ |
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560 |
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561 offset -= rc; |
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562 } /* while */ |
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563 |
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564 return(1); |
|
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565 } /* VOC_seek */ |
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566 |
|
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567 #endif /* SOUND_SUPPORTS_VOC */ |
| 14 | 568 |
| 569 /* end of voc.c ... */ |