Mercurial > SDL_sound_CoreAudio
annotate decoders/voc.c @ 355:5dbf2f9cde00
Added docs stuff.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 07 Jun 2002 13:26:13 +0000 |
| parents | f6475949cd59 |
| children | cbb15ecf423a |
| 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 #include <assert.h> | |
| 50 | |
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51 #include "SDL_sound.h" |
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52 |
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53 #define __SDL_SOUND_INTERNAL__ |
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54 #include "SDL_sound_internal.h" |
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55 |
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56 static int VOC_init(void); |
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57 static void VOC_quit(void); |
| 14 | 58 static int VOC_open(Sound_Sample *sample, const char *ext); |
| 59 static void VOC_close(Sound_Sample *sample); | |
| 60 static Uint32 VOC_read(Sound_Sample *sample); | |
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61 static int VOC_rewind(Sound_Sample *sample); |
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62 static int VOC_seek(Sound_Sample *sample, Uint32 ms); |
| 14 | 63 |
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64 static const char *extensions_voc[] = { "VOC", NULL }; |
| 14 | 65 const Sound_DecoderFunctions __Sound_DecoderFunctions_VOC = |
| 66 { | |
| 67 { | |
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68 extensions_voc, |
| 14 | 69 "Creative Labs Voice format", |
| 70 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
| 71 "http://www.icculus.org/SDL_sound/" | |
| 72 }, | |
| 73 | |
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74 VOC_init, /* init() method */ |
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75 VOC_quit, /* quit() method */ |
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76 VOC_open, /* open() method */ |
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77 VOC_close, /* close() method */ |
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78 VOC_read, /* read() method */ |
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79 VOC_rewind, /* rewind() method */ |
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80 VOC_seek /* seek() method */ |
| 14 | 81 }; |
| 82 | |
| 83 | |
| 84 /* Private data for VOC file */ | |
| 85 typedef struct vocstuff { | |
| 86 Uint32 rest; /* bytes remaining in current block */ | |
| 87 Uint32 rate; /* rate code (byte) of this chunk */ | |
| 88 int silent; /* sound or silence? */ | |
| 89 Uint32 srate; /* rate code (byte) of silence */ | |
| 90 Uint32 blockseek; /* start of current output block */ | |
| 91 Uint32 samples; /* number of samples output */ | |
| 92 Uint32 size; /* word length of data */ | |
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93 Uint8 channels; /* number of sound channels */ |
| 14 | 94 int extended; /* Has an extended block been read? */ |
| 95 Uint32 bufpos; /* byte position in internal->buffer. */ | |
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96 Uint32 start_pos; /* offset to seek to in stream when rewinding. */ |
| 14 | 97 } vs_t; |
| 98 | |
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99 /* Size field */ |
| 14 | 100 /* SJB: note that the 1st 3 are sometimes used as sizeof(type) */ |
| 101 #define ST_SIZE_BYTE 1 | |
| 102 #define ST_SIZE_8BIT 1 | |
| 103 #define ST_SIZE_WORD 2 | |
| 104 #define ST_SIZE_16BIT 2 | |
| 105 #define ST_SIZE_DWORD 4 | |
| 106 #define ST_SIZE_32BIT 4 | |
| 107 #define ST_SIZE_FLOAT 5 | |
| 108 #define ST_SIZE_DOUBLE 6 | |
| 109 #define ST_SIZE_IEEE 7 /* IEEE 80-bit floats. */ | |
| 110 | |
| 111 /* Style field */ | |
| 112 #define ST_ENCODING_UNSIGNED 1 /* unsigned linear: Sound Blaster */ | |
| 113 #define ST_ENCODING_SIGN2 2 /* signed linear 2's comp: Mac */ | |
| 114 #define ST_ENCODING_ULAW 3 /* U-law signed logs: US telephony, SPARC */ | |
| 115 #define ST_ENCODING_ALAW 4 /* A-law signed logs: non-US telephony */ | |
| 116 #define ST_ENCODING_ADPCM 5 /* Compressed PCM */ | |
| 117 #define ST_ENCODING_IMA_ADPCM 6 /* Compressed PCM */ | |
| 118 #define ST_ENCODING_GSM 7 /* GSM 6.10 33-byte frame lossy compression */ | |
| 119 | |
| 120 #define VOC_TERM 0 | |
| 121 #define VOC_DATA 1 | |
| 122 #define VOC_CONT 2 | |
| 123 #define VOC_SILENCE 3 | |
| 124 #define VOC_MARKER 4 | |
| 125 #define VOC_TEXT 5 | |
| 126 #define VOC_LOOP 6 | |
| 127 #define VOC_LOOPEND 7 | |
| 128 #define VOC_EXTENDED 8 | |
| 129 #define VOC_DATA_16 9 | |
| 130 | |
| 131 | |
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132 static int VOC_init(void) |
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133 { |
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134 return(1); /* always succeeds. */ |
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135 } /* VOC_init */ |
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136 |
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137 |
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138 static void VOC_quit(void) |
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139 { |
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140 /* it's a no-op. */ |
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141 } /* VOC_quit */ |
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142 |
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143 |
| 301 | 144 static inline int voc_check_header(SDL_RWops *src) |
| 14 | 145 { |
| 146 /* VOC magic header */ | |
| 147 Uint8 signature[20]; /* "Creative Voice File\032" */ | |
| 148 Uint16 datablockofs; | |
| 149 | |
| 150 if (SDL_RWread(src, signature, sizeof (signature), 1) != 1) | |
| 151 return(0); | |
| 152 | |
| 153 if (memcmp(signature, "Creative Voice File\032", sizeof (signature)) != 0) { | |
| 154 Sound_SetError("Unrecognized file type (not VOC)"); | |
| 155 return(0); | |
| 156 } | |
| 157 | |
| 158 /* get the offset where the first datablock is located */ | |
| 159 if (SDL_RWread(src, &datablockofs, sizeof (Uint16), 1) != 1) | |
| 160 return(0); | |
| 161 | |
| 162 datablockofs = SDL_SwapLE16(datablockofs); | |
| 163 | |
| 164 if (SDL_RWseek(src, datablockofs, SEEK_SET) != datablockofs) | |
| 165 return(0); | |
| 166 | |
| 167 return(1); /* success! */ | |
| 168 } /* voc_check_header */ | |
| 169 | |
| 170 /* !!! FIXME : Add a flag to vs_t that distinguishes EOF and Error conditions. */ | |
| 171 | |
| 172 /* Read next block header, save info, leave position at start of data */ | |
| 173 static int voc_get_block(Sound_Sample *sample) | |
| 174 { | |
| 175 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 176 SDL_RWops *src = internal->rw; | |
| 177 vs_t *v = (vs_t *) internal->decoder_private; | |
| 178 Uint8 bits24[3]; | |
| 179 Uint8 uc, block; | |
| 180 Uint32 sblen; | |
| 181 Uint16 new_rate_short; | |
| 182 Uint32 new_rate_long; | |
| 183 Uint8 trash[6]; | |
| 184 Uint16 period; | |
| 185 int i; | |
| 186 | |
| 187 v->silent = 0; | |
| 188 while (v->rest == 0) | |
| 189 { | |
| 190 if (SDL_RWread(src, &block, sizeof (block), 1) != 1) | |
| 191 return 1; /* assume that's the end of the file. */ | |
| 192 | |
| 193 if (block == VOC_TERM) | |
| 194 return 1; | |
| 195 | |
| 196 if (SDL_RWread(src, bits24, sizeof (bits24), 1) != 1) | |
| 197 return 1; /* assume that's the end of the file. */ | |
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198 |
| 14 | 199 /* Size is an 24-bit value. Ugh. */ |
| 200 sblen = ( (bits24[0]) | (bits24[1] << 8) | (bits24[2] << 16) ); | |
| 201 | |
| 202 switch(block) | |
| 203 { | |
| 204 case VOC_DATA: | |
| 205 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 206 return 0; | |
| 207 | |
| 208 /* When DATA block preceeded by an EXTENDED */ | |
| 209 /* block, the DATA blocks rate value is invalid */ | |
| 210 if (!v->extended) | |
| 211 { | |
| 212 if (uc == 0) | |
| 213 { | |
| 214 Sound_SetError("VOC Sample rate is zero?"); | |
| 215 return 0; | |
| 216 } | |
| 217 | |
| 218 if ((v->rate != -1) && (uc != v->rate)) | |
| 219 { | |
| 220 Sound_SetError("VOC sample rate codes differ"); | |
| 221 return 0; | |
| 222 } | |
| 223 | |
| 224 v->rate = uc; | |
| 225 sample->actual.rate = 1000000.0/(256 - v->rate); | |
| 226 v->channels = 1; | |
| 227 } | |
| 228 | |
| 229 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 230 return 0; | |
| 231 | |
| 232 if (uc != 0) | |
| 233 { | |
| 234 Sound_SetError("VOC decoder only interprets 8-bit data"); | |
| 235 return 0; | |
| 236 } | |
| 237 | |
| 238 v->extended = 0; | |
| 239 v->rest = sblen - 2; | |
| 240 v->size = ST_SIZE_BYTE; | |
| 241 return 1; | |
| 242 | |
| 243 case VOC_DATA_16: | |
| 244 if (SDL_RWread(src, &new_rate_long, sizeof (new_rate_long), 1) != 1) | |
| 245 return 0; | |
| 246 new_rate_long = SDL_SwapLE32(new_rate_long); | |
| 247 if (new_rate_long == 0) | |
| 248 { | |
| 249 Sound_SetError("VOC Sample rate is zero?"); | |
| 250 return 0; | |
| 251 } | |
| 252 if ((v->rate != -1) && (new_rate_long != v->rate)) | |
| 253 { | |
| 254 Sound_SetError("VOC sample rate codes differ"); | |
| 255 return 0; | |
| 256 } | |
| 257 v->rate = new_rate_long; | |
| 258 sample->actual.rate = new_rate_long; | |
| 259 | |
| 260 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 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: | |
| 268 Sound_SetError("VOC with unknown data size"); | |
| 269 return 0; | |
| 270 } | |
| 271 | |
| 272 if (SDL_RWread(src, &v->channels, sizeof (Uint8), 1) != 1) | |
| 273 return 0; | |
| 274 | |
| 275 if (SDL_RWread(src, trash, sizeof (Uint8), 6) != 6) | |
| 276 return 0; | |
| 277 | |
| 278 v->rest = sblen - 12; | |
| 279 return 1; | |
| 280 | |
| 281 case VOC_CONT: | |
| 282 v->rest = sblen; | |
| 283 return 1; | |
| 284 | |
| 285 case VOC_SILENCE: | |
| 286 if (SDL_RWread(src, &period, sizeof (period), 1) != 1) | |
| 287 return 0; | |
| 288 period = SDL_SwapLE16(period); | |
| 289 | |
| 290 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 291 return 0; | |
| 292 if (uc == 0) | |
| 293 { | |
| 294 Sound_SetError("VOC silence sample rate is zero"); | |
| 295 return 0; | |
| 296 } | |
| 297 | |
| 298 /* | |
| 299 * Some silence-packed files have gratuitously | |
| 300 * different sample rate codes in silence. | |
| 301 * Adjust period. | |
| 302 */ | |
| 303 if ((v->rate != -1) && (uc != v->rate)) | |
| 304 period = (period * (256 - uc))/(256 - v->rate); | |
| 305 else | |
| 306 v->rate = uc; | |
| 307 v->rest = period; | |
| 308 v->silent = 1; | |
| 309 return 1; | |
| 310 | |
| 311 case VOC_LOOP: | |
| 312 case VOC_LOOPEND: | |
| 313 for(i = 0; i < sblen; i++) /* skip repeat loops. */ | |
| 314 { | |
| 315 if (SDL_RWread(src, trash, sizeof (Uint8), 1) != 1) | |
| 316 return 0; | |
| 317 } | |
| 318 break; | |
| 319 | |
| 320 case VOC_EXTENDED: | |
| 321 /* An Extended block is followed by a data block */ | |
| 322 /* Set this byte so we know to use the rate */ | |
| 323 /* value from the extended block and not the */ | |
| 324 /* data block. */ | |
| 325 v->extended = 1; | |
| 326 if (SDL_RWread(src, &new_rate_short, sizeof (new_rate_short), 1) != 1) | |
| 327 return 0; | |
| 328 new_rate_short = SDL_SwapLE16(new_rate_short); | |
| 329 if (new_rate_short == 0) | |
| 330 { | |
| 331 Sound_SetError("VOC sample rate is zero"); | |
| 332 return 0; | |
| 333 } | |
| 334 if ((v->rate != -1) && (new_rate_short != v->rate)) | |
| 335 { | |
| 336 Sound_SetError("VOC sample rate codes differ"); | |
| 337 return 0; | |
| 338 } | |
| 339 v->rate = new_rate_short; | |
| 340 | |
| 341 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 342 return 0; | |
| 343 | |
| 344 if (uc != 0) | |
| 345 { | |
| 346 Sound_SetError("VOC decoder only interprets 8-bit data"); | |
| 347 return 0; | |
| 348 } | |
| 349 | |
| 350 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 351 return 0; | |
| 352 | |
| 353 if (uc) | |
| 354 sample->actual.channels = 2; /* Stereo */ | |
| 355 /* Needed number of channels before finishing | |
| 356 compute for rate */ | |
| 357 sample->actual.rate = | |
| 358 (256000000L/(65536L - v->rate)) / sample->actual.channels; | |
| 359 /* An extended block must be followed by a data */ | |
| 360 /* block to be valid so loop back to top so it */ | |
| 361 /* can be grabed. */ | |
| 362 continue; | |
| 363 | |
| 364 case VOC_MARKER: | |
| 365 if (SDL_RWread(src, trash, sizeof (Uint8), 2) != 2) | |
| 366 return 0; | |
| 367 | |
| 368 /* Falling! Falling! */ | |
| 369 | |
| 370 default: /* text block or other krapola. */ | |
| 371 for(i = 0; i < sblen; i++) | |
| 372 { | |
| 373 if (SDL_RWread(src, &trash, sizeof (Uint8), 1) != 1) | |
| 374 return 0; | |
| 375 } | |
| 376 | |
| 377 if (block == VOC_TEXT) | |
| 378 continue; /* get next block */ | |
| 379 } | |
| 380 } | |
| 381 | |
| 382 return 1; | |
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383 } /* voc_get_block */ |
| 14 | 384 |
| 385 | |
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386 static int voc_read_waveform(Sound_Sample *sample, int fill_buf, Uint32 max) |
| 14 | 387 { |
| 388 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 389 SDL_RWops *src = internal->rw; | |
| 390 vs_t *v = (vs_t *) internal->decoder_private; | |
| 391 int done = 0; | |
| 392 Uint8 silence = 0x80; | |
| 393 Uint8 *buf = internal->buffer; | |
| 394 | |
| 395 if (v->rest == 0) | |
| 396 { | |
| 397 if (!voc_get_block(sample)) | |
| 398 return 0; | |
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399 } /* if */ |
| 14 | 400 |
| 401 if (v->rest == 0) | |
| 402 return 0; | |
| 403 | |
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404 max = (v->rest < max) ? v->rest : max; |
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405 |
| 14 | 406 if (v->silent) |
| 407 { | |
| 408 if (v->size == ST_SIZE_WORD) | |
| 409 silence = 0x00; | |
| 410 | |
| 411 /* Fill in silence */ | |
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412 if (fill_buf) |
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413 memset(buf + v->bufpos, silence, max); |
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414 |
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415 done = max; |
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416 v->rest -= done; |
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417 } /* if */ |
| 14 | 418 |
| 419 else | |
| 420 { | |
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421 if (fill_buf) |
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422 done = SDL_RWread(src, buf + v->bufpos, 1, max); |
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423 else |
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424 { |
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425 int cur, rc; |
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426 cur = SDL_RWtell(src); |
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427 if (cur >= 0) |
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428 { |
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429 rc = SDL_RWseek(src, max, SEEK_CUR); |
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430 if (rc >= 0) |
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431 done = rc - cur; |
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432 } /* if */ |
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433 } /* else */ |
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434 |
| 14 | 435 v->rest -= done; |
| 436 v->bufpos += done; | |
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437 } /* else */ |
| 14 | 438 |
| 439 return done; | |
|
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440 } /* voc_read_waveform */ |
| 14 | 441 |
| 442 | |
| 443 static int VOC_open(Sound_Sample *sample, const char *ext) | |
| 444 { | |
| 445 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 446 vs_t *v = NULL; | |
| 447 | |
| 448 if (!voc_check_header(internal->rw)) | |
| 449 return(0); | |
| 450 | |
| 451 v = (vs_t *) malloc(sizeof (vs_t)); | |
| 452 BAIL_IF_MACRO(v == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 453 memset(v, '\0', sizeof (vs_t)); | |
| 454 internal->decoder_private = v; | |
| 455 | |
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456 v->start_pos = SDL_RWtell(internal->rw); |
| 14 | 457 v->rate = -1; |
| 458 if (!voc_get_block(sample)) | |
| 459 { | |
| 460 free(v); | |
| 461 return(0); | |
| 462 } /* if */ | |
| 463 | |
| 464 if (v->rate == -1) | |
| 465 { | |
| 466 Sound_SetError("VOC data had no sound!"); | |
| 467 free(v); | |
| 468 return(0); | |
| 469 } /* if */ | |
| 470 | |
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471 SNDDBG(("VOC: Accepting data stream.\n")); |
| 14 | 472 sample->actual.format = (v->size == ST_SIZE_WORD) ? AUDIO_S16LSB:AUDIO_U8; |
| 473 sample->actual.channels = v->channels; | |
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474 sample->flags = SOUND_SAMPLEFLAG_CANSEEK; |
| 14 | 475 return(1); |
| 476 } /* VOC_open */ | |
| 477 | |
| 478 | |
| 479 static void VOC_close(Sound_Sample *sample) | |
| 480 { | |
| 481 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 482 free(internal->decoder_private); | |
| 483 } /* VOC_close */ | |
| 484 | |
| 485 | |
| 486 static Uint32 VOC_read(Sound_Sample *sample) | |
| 487 { | |
| 488 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 489 vs_t *v = (vs_t *) internal->decoder_private; | |
| 490 | |
| 491 v->bufpos = 0; | |
| 492 while (v->bufpos < internal->buffer_size) | |
| 493 { | |
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494 Uint32 rc = voc_read_waveform(sample, 1, internal->buffer_size); |
| 14 | 495 if (rc == 0) /* !!! FIXME: Could be an error... */ |
| 496 { | |
| 497 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 498 break; | |
| 499 } /* if */ | |
| 500 | |
| 501 if (!voc_get_block(sample)) | |
| 502 { | |
| 503 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 504 break; | |
| 505 } /* if */ | |
| 506 } /* while */ | |
| 507 | |
| 508 return(v->bufpos); | |
| 509 } /* VOC_read */ | |
| 510 | |
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511 |
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512 static int VOC_rewind(Sound_Sample *sample) |
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513 { |
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514 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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515 vs_t *v = (vs_t *) internal->decoder_private; |
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516 int rc = SDL_RWseek(internal->rw, v->start_pos, SEEK_SET); |
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517 BAIL_IF_MACRO(rc != v->start_pos, ERR_IO_ERROR, 0); |
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518 v->rest = 0; |
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519 return(1); |
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520 } /* VOC_rewind */ |
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521 |
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522 |
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523 static int VOC_seek(Sound_Sample *sample, Uint32 ms) |
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524 { |
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525 /* |
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526 * VOCs don't lend themselves well to seeking, since you have to |
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527 * parse each section, which is an arbitrary size. The best we can do |
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528 * is rewind, set a flag saying not to write the waveforms to a buffer, |
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529 * and decode to the point that we want. Ugh. Fortunately, there's |
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530 * really no such thing as a large VOC, due to the era and hardware that |
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531 * spawned them, so even though this is inefficient, this is still a |
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532 * relatively fast operation in most cases. |
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533 */ |
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534 |
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535 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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536 vs_t *v = (vs_t *) internal->decoder_private; |
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537 int offset = __Sound_convertMsToBytePos(&sample->actual, ms); |
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538 int origpos = SDL_RWtell(internal->rw); |
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539 int origrest = v->rest; |
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540 |
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541 BAIL_IF_MACRO(!VOC_rewind(sample), NULL, 0); |
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542 |
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543 v->bufpos = 0; |
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544 |
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545 while (offset > 0) |
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546 { |
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547 Uint32 rc = voc_read_waveform(sample, 0, offset); |
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548 if ( (rc == 0) || (!voc_get_block(sample)) ) |
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549 { |
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550 SDL_RWseek(internal->rw, origpos, SEEK_SET); |
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551 v->rest = origrest; |
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552 return(0); |
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553 } /* if */ |
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554 |
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555 offset -= rc; |
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556 } /* while */ |
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557 |
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558 return(1); |
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559 } /* VOC_seek */ |
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560 |
|
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561 #endif /* SOUND_SUPPORTS_VOC */ |
| 14 | 562 |
| 563 /* end of voc.c ... */ |