Mercurial > SDL_sound_CoreAudio
annotate decoders/voc.c @ 377:cbb15ecf423a
WinCE (PocketPC) patches from Tyler.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Tue, 02 Jul 2002 03:58:24 +0000 |
| parents | f6475949cd59 |
| children | 9efb760c4a6b |
| 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 { | |
| 85 Uint32 rest; /* bytes remaining in current block */ | |
| 86 Uint32 rate; /* rate code (byte) of this chunk */ | |
| 87 int silent; /* sound or silence? */ | |
| 88 Uint32 srate; /* rate code (byte) of silence */ | |
| 89 Uint32 blockseek; /* start of current output block */ | |
| 90 Uint32 samples; /* number of samples output */ | |
| 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. */ |
| 14 | 96 } vs_t; |
| 97 | |
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98 /* Size field */ |
| 14 | 99 /* SJB: note that the 1st 3 are sometimes used as sizeof(type) */ |
| 100 #define ST_SIZE_BYTE 1 | |
| 101 #define ST_SIZE_8BIT 1 | |
| 102 #define ST_SIZE_WORD 2 | |
| 103 #define ST_SIZE_16BIT 2 | |
| 104 #define ST_SIZE_DWORD 4 | |
| 105 #define ST_SIZE_32BIT 4 | |
| 106 #define ST_SIZE_FLOAT 5 | |
| 107 #define ST_SIZE_DOUBLE 6 | |
| 108 #define ST_SIZE_IEEE 7 /* IEEE 80-bit floats. */ | |
| 109 | |
| 110 /* Style field */ | |
| 111 #define ST_ENCODING_UNSIGNED 1 /* unsigned linear: Sound Blaster */ | |
| 112 #define ST_ENCODING_SIGN2 2 /* signed linear 2's comp: Mac */ | |
| 113 #define ST_ENCODING_ULAW 3 /* U-law signed logs: US telephony, SPARC */ | |
| 114 #define ST_ENCODING_ALAW 4 /* A-law signed logs: non-US telephony */ | |
| 115 #define ST_ENCODING_ADPCM 5 /* Compressed PCM */ | |
| 116 #define ST_ENCODING_IMA_ADPCM 6 /* Compressed PCM */ | |
| 117 #define ST_ENCODING_GSM 7 /* GSM 6.10 33-byte frame lossy compression */ | |
| 118 | |
| 119 #define VOC_TERM 0 | |
| 120 #define VOC_DATA 1 | |
| 121 #define VOC_CONT 2 | |
| 122 #define VOC_SILENCE 3 | |
| 123 #define VOC_MARKER 4 | |
| 124 #define VOC_TEXT 5 | |
| 125 #define VOC_LOOP 6 | |
| 126 #define VOC_LOOPEND 7 | |
| 127 #define VOC_EXTENDED 8 | |
| 128 #define VOC_DATA_16 9 | |
| 129 | |
| 130 | |
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131 static int VOC_init(void) |
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132 { |
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133 return(1); /* always succeeds. */ |
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134 } /* VOC_init */ |
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135 |
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136 |
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137 static void VOC_quit(void) |
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138 { |
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139 /* it's a no-op. */ |
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140 } /* VOC_quit */ |
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141 |
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142 |
| 301 | 143 static inline int voc_check_header(SDL_RWops *src) |
| 14 | 144 { |
| 145 /* VOC magic header */ | |
| 146 Uint8 signature[20]; /* "Creative Voice File\032" */ | |
| 147 Uint16 datablockofs; | |
| 148 | |
| 149 if (SDL_RWread(src, signature, sizeof (signature), 1) != 1) | |
| 150 return(0); | |
| 151 | |
| 152 if (memcmp(signature, "Creative Voice File\032", sizeof (signature)) != 0) { | |
| 153 Sound_SetError("Unrecognized file type (not VOC)"); | |
| 154 return(0); | |
| 155 } | |
| 156 | |
| 157 /* get the offset where the first datablock is located */ | |
| 158 if (SDL_RWread(src, &datablockofs, sizeof (Uint16), 1) != 1) | |
| 159 return(0); | |
| 160 | |
| 161 datablockofs = SDL_SwapLE16(datablockofs); | |
| 162 | |
| 163 if (SDL_RWseek(src, datablockofs, SEEK_SET) != datablockofs) | |
| 164 return(0); | |
| 165 | |
| 166 return(1); /* success! */ | |
| 167 } /* voc_check_header */ | |
| 168 | |
| 169 /* !!! FIXME : Add a flag to vs_t that distinguishes EOF and Error conditions. */ | |
| 170 | |
| 171 /* Read next block header, save info, leave position at start of data */ | |
| 172 static int voc_get_block(Sound_Sample *sample) | |
| 173 { | |
| 174 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 175 SDL_RWops *src = internal->rw; | |
| 176 vs_t *v = (vs_t *) internal->decoder_private; | |
| 177 Uint8 bits24[3]; | |
| 178 Uint8 uc, block; | |
| 179 Uint32 sblen; | |
| 180 Uint16 new_rate_short; | |
| 181 Uint32 new_rate_long; | |
| 182 Uint8 trash[6]; | |
| 183 Uint16 period; | |
| 184 int i; | |
| 185 | |
| 186 v->silent = 0; | |
| 187 while (v->rest == 0) | |
| 188 { | |
| 189 if (SDL_RWread(src, &block, sizeof (block), 1) != 1) | |
| 190 return 1; /* assume that's the end of the file. */ | |
| 191 | |
| 192 if (block == VOC_TERM) | |
| 193 return 1; | |
| 194 | |
| 195 if (SDL_RWread(src, bits24, sizeof (bits24), 1) != 1) | |
| 196 return 1; /* assume that's the end of the file. */ | |
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197 |
| 14 | 198 /* Size is an 24-bit value. Ugh. */ |
| 199 sblen = ( (bits24[0]) | (bits24[1] << 8) | (bits24[2] << 16) ); | |
| 200 | |
| 201 switch(block) | |
| 202 { | |
| 203 case VOC_DATA: | |
| 204 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 205 return 0; | |
| 206 | |
| 207 /* When DATA block preceeded by an EXTENDED */ | |
| 208 /* block, the DATA blocks rate value is invalid */ | |
| 209 if (!v->extended) | |
| 210 { | |
| 211 if (uc == 0) | |
| 212 { | |
| 213 Sound_SetError("VOC Sample rate is zero?"); | |
| 214 return 0; | |
| 215 } | |
| 216 | |
| 217 if ((v->rate != -1) && (uc != v->rate)) | |
| 218 { | |
| 219 Sound_SetError("VOC sample rate codes differ"); | |
| 220 return 0; | |
| 221 } | |
| 222 | |
| 223 v->rate = uc; | |
| 224 sample->actual.rate = 1000000.0/(256 - v->rate); | |
| 225 v->channels = 1; | |
| 226 } | |
| 227 | |
| 228 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 229 return 0; | |
| 230 | |
| 231 if (uc != 0) | |
| 232 { | |
| 233 Sound_SetError("VOC decoder only interprets 8-bit data"); | |
| 234 return 0; | |
| 235 } | |
| 236 | |
| 237 v->extended = 0; | |
| 238 v->rest = sblen - 2; | |
| 239 v->size = ST_SIZE_BYTE; | |
| 240 return 1; | |
| 241 | |
| 242 case VOC_DATA_16: | |
| 243 if (SDL_RWread(src, &new_rate_long, sizeof (new_rate_long), 1) != 1) | |
| 244 return 0; | |
| 245 new_rate_long = SDL_SwapLE32(new_rate_long); | |
| 246 if (new_rate_long == 0) | |
| 247 { | |
| 248 Sound_SetError("VOC Sample rate is zero?"); | |
| 249 return 0; | |
| 250 } | |
| 251 if ((v->rate != -1) && (new_rate_long != v->rate)) | |
| 252 { | |
| 253 Sound_SetError("VOC sample rate codes differ"); | |
| 254 return 0; | |
| 255 } | |
| 256 v->rate = new_rate_long; | |
| 257 sample->actual.rate = new_rate_long; | |
| 258 | |
| 259 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 260 return 0; | |
| 261 | |
| 262 switch (uc) | |
| 263 { | |
| 264 case 8: v->size = ST_SIZE_BYTE; break; | |
| 265 case 16: v->size = ST_SIZE_WORD; break; | |
| 266 default: | |
| 267 Sound_SetError("VOC with unknown data size"); | |
| 268 return 0; | |
| 269 } | |
| 270 | |
| 271 if (SDL_RWread(src, &v->channels, sizeof (Uint8), 1) != 1) | |
| 272 return 0; | |
| 273 | |
| 274 if (SDL_RWread(src, trash, sizeof (Uint8), 6) != 6) | |
| 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: | |
| 285 if (SDL_RWread(src, &period, sizeof (period), 1) != 1) | |
| 286 return 0; | |
| 287 period = SDL_SwapLE16(period); | |
| 288 | |
| 289 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 290 return 0; | |
| 291 if (uc == 0) | |
| 292 { | |
| 293 Sound_SetError("VOC silence sample rate is zero"); | |
| 294 return 0; | |
| 295 } | |
| 296 | |
| 297 /* | |
| 298 * Some silence-packed files have gratuitously | |
| 299 * different sample rate codes in silence. | |
| 300 * Adjust period. | |
| 301 */ | |
| 302 if ((v->rate != -1) && (uc != v->rate)) | |
| 303 period = (period * (256 - uc))/(256 - v->rate); | |
| 304 else | |
| 305 v->rate = uc; | |
| 306 v->rest = period; | |
| 307 v->silent = 1; | |
| 308 return 1; | |
| 309 | |
| 310 case VOC_LOOP: | |
| 311 case VOC_LOOPEND: | |
| 312 for(i = 0; i < sblen; i++) /* skip repeat loops. */ | |
| 313 { | |
| 314 if (SDL_RWread(src, trash, sizeof (Uint8), 1) != 1) | |
| 315 return 0; | |
| 316 } | |
| 317 break; | |
| 318 | |
| 319 case VOC_EXTENDED: | |
| 320 /* An Extended block is followed by a data block */ | |
| 321 /* Set this byte so we know to use the rate */ | |
| 322 /* value from the extended block and not the */ | |
| 323 /* data block. */ | |
| 324 v->extended = 1; | |
| 325 if (SDL_RWread(src, &new_rate_short, sizeof (new_rate_short), 1) != 1) | |
| 326 return 0; | |
| 327 new_rate_short = SDL_SwapLE16(new_rate_short); | |
| 328 if (new_rate_short == 0) | |
| 329 { | |
| 330 Sound_SetError("VOC sample rate is zero"); | |
| 331 return 0; | |
| 332 } | |
| 333 if ((v->rate != -1) && (new_rate_short != v->rate)) | |
| 334 { | |
| 335 Sound_SetError("VOC sample rate codes differ"); | |
| 336 return 0; | |
| 337 } | |
| 338 v->rate = new_rate_short; | |
| 339 | |
| 340 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 341 return 0; | |
| 342 | |
| 343 if (uc != 0) | |
| 344 { | |
| 345 Sound_SetError("VOC decoder only interprets 8-bit data"); | |
| 346 return 0; | |
| 347 } | |
| 348 | |
| 349 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1) | |
| 350 return 0; | |
| 351 | |
| 352 if (uc) | |
| 353 sample->actual.channels = 2; /* Stereo */ | |
| 354 /* Needed number of channels before finishing | |
| 355 compute for rate */ | |
| 356 sample->actual.rate = | |
| 357 (256000000L/(65536L - v->rate)) / sample->actual.channels; | |
| 358 /* An extended block must be followed by a data */ | |
| 359 /* block to be valid so loop back to top so it */ | |
| 360 /* can be grabed. */ | |
| 361 continue; | |
| 362 | |
| 363 case VOC_MARKER: | |
| 364 if (SDL_RWread(src, trash, sizeof (Uint8), 2) != 2) | |
| 365 return 0; | |
| 366 | |
| 367 /* Falling! Falling! */ | |
| 368 | |
| 369 default: /* text block or other krapola. */ | |
| 370 for(i = 0; i < sblen; i++) | |
| 371 { | |
| 372 if (SDL_RWread(src, &trash, sizeof (Uint8), 1) != 1) | |
| 373 return 0; | |
| 374 } | |
| 375 | |
| 376 if (block == VOC_TEXT) | |
| 377 continue; /* get next block */ | |
| 378 } | |
| 379 } | |
| 380 | |
| 381 return 1; | |
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382 } /* voc_get_block */ |
| 14 | 383 |
| 384 | |
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385 static int voc_read_waveform(Sound_Sample *sample, int fill_buf, Uint32 max) |
| 14 | 386 { |
| 387 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 388 SDL_RWops *src = internal->rw; | |
| 389 vs_t *v = (vs_t *) internal->decoder_private; | |
| 390 int done = 0; | |
| 391 Uint8 silence = 0x80; | |
| 392 Uint8 *buf = internal->buffer; | |
| 393 | |
| 394 if (v->rest == 0) | |
| 395 { | |
| 396 if (!voc_get_block(sample)) | |
| 397 return 0; | |
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398 } /* if */ |
| 14 | 399 |
| 400 if (v->rest == 0) | |
| 401 return 0; | |
| 402 | |
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403 max = (v->rest < max) ? v->rest : max; |
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404 |
| 14 | 405 if (v->silent) |
| 406 { | |
| 407 if (v->size == ST_SIZE_WORD) | |
| 408 silence = 0x00; | |
| 409 | |
| 410 /* Fill in silence */ | |
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411 if (fill_buf) |
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412 memset(buf + v->bufpos, silence, max); |
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413 |
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414 done = max; |
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415 v->rest -= done; |
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416 } /* if */ |
| 14 | 417 |
| 418 else | |
| 419 { | |
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420 if (fill_buf) |
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421 done = SDL_RWread(src, buf + v->bufpos, 1, max); |
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422 else |
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423 { |
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424 int cur, rc; |
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425 cur = SDL_RWtell(src); |
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426 if (cur >= 0) |
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427 { |
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428 rc = SDL_RWseek(src, max, SEEK_CUR); |
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429 if (rc >= 0) |
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430 done = rc - cur; |
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431 } /* if */ |
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432 } /* else */ |
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433 |
| 14 | 434 v->rest -= done; |
| 435 v->bufpos += done; | |
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436 } /* else */ |
| 14 | 437 |
| 438 return done; | |
|
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439 } /* voc_read_waveform */ |
| 14 | 440 |
| 441 | |
| 442 static int VOC_open(Sound_Sample *sample, const char *ext) | |
| 443 { | |
| 444 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 445 vs_t *v = NULL; | |
| 446 | |
| 447 if (!voc_check_header(internal->rw)) | |
| 448 return(0); | |
| 449 | |
| 450 v = (vs_t *) malloc(sizeof (vs_t)); | |
| 451 BAIL_IF_MACRO(v == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 452 memset(v, '\0', sizeof (vs_t)); | |
| 453 internal->decoder_private = v; | |
| 454 | |
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455 v->start_pos = SDL_RWtell(internal->rw); |
| 14 | 456 v->rate = -1; |
| 457 if (!voc_get_block(sample)) | |
| 458 { | |
| 459 free(v); | |
| 460 return(0); | |
| 461 } /* if */ | |
| 462 | |
| 463 if (v->rate == -1) | |
| 464 { | |
| 465 Sound_SetError("VOC data had no sound!"); | |
| 466 free(v); | |
| 467 return(0); | |
| 468 } /* if */ | |
| 469 | |
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470 SNDDBG(("VOC: Accepting data stream.\n")); |
| 14 | 471 sample->actual.format = (v->size == ST_SIZE_WORD) ? AUDIO_S16LSB:AUDIO_U8; |
| 472 sample->actual.channels = v->channels; | |
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473 sample->flags = SOUND_SAMPLEFLAG_CANSEEK; |
| 14 | 474 return(1); |
| 475 } /* VOC_open */ | |
| 476 | |
| 477 | |
| 478 static void VOC_close(Sound_Sample *sample) | |
| 479 { | |
| 480 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 481 free(internal->decoder_private); | |
| 482 } /* VOC_close */ | |
| 483 | |
| 484 | |
| 485 static Uint32 VOC_read(Sound_Sample *sample) | |
| 486 { | |
| 487 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 488 vs_t *v = (vs_t *) internal->decoder_private; | |
| 489 | |
| 490 v->bufpos = 0; | |
| 491 while (v->bufpos < internal->buffer_size) | |
| 492 { | |
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493 Uint32 rc = voc_read_waveform(sample, 1, internal->buffer_size); |
| 14 | 494 if (rc == 0) /* !!! FIXME: Could be an error... */ |
| 495 { | |
| 496 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 497 break; | |
| 498 } /* if */ | |
| 499 | |
| 500 if (!voc_get_block(sample)) | |
| 501 { | |
| 502 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 503 break; | |
| 504 } /* if */ | |
| 505 } /* while */ | |
| 506 | |
| 507 return(v->bufpos); | |
| 508 } /* VOC_read */ | |
| 509 | |
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510 |
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511 static int VOC_rewind(Sound_Sample *sample) |
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512 { |
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513 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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514 vs_t *v = (vs_t *) internal->decoder_private; |
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515 int rc = SDL_RWseek(internal->rw, v->start_pos, SEEK_SET); |
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516 BAIL_IF_MACRO(rc != v->start_pos, ERR_IO_ERROR, 0); |
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517 v->rest = 0; |
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518 return(1); |
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519 } /* VOC_rewind */ |
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520 |
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521 |
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522 static int VOC_seek(Sound_Sample *sample, Uint32 ms) |
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523 { |
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524 /* |
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525 * VOCs don't lend themselves well to seeking, since you have to |
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526 * parse each section, which is an arbitrary size. The best we can do |
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527 * is rewind, set a flag saying not to write the waveforms to a buffer, |
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528 * and decode to the point that we want. Ugh. Fortunately, there's |
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529 * really no such thing as a large VOC, due to the era and hardware that |
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530 * spawned them, so even though this is inefficient, this is still a |
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531 * relatively fast operation in most cases. |
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532 */ |
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533 |
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534 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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535 vs_t *v = (vs_t *) internal->decoder_private; |
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536 int offset = __Sound_convertMsToBytePos(&sample->actual, ms); |
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537 int origpos = SDL_RWtell(internal->rw); |
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538 int origrest = v->rest; |
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539 |
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540 BAIL_IF_MACRO(!VOC_rewind(sample), NULL, 0); |
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541 |
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542 v->bufpos = 0; |
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543 |
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544 while (offset > 0) |
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545 { |
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546 Uint32 rc = voc_read_waveform(sample, 0, offset); |
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547 if ( (rc == 0) || (!voc_get_block(sample)) ) |
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548 { |
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549 SDL_RWseek(internal->rw, origpos, SEEK_SET); |
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550 v->rest = origrest; |
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551 return(0); |
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552 } /* if */ |
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553 |
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554 offset -= rc; |
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555 } /* while */ |
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556 |
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557 return(1); |
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558 } /* VOC_seek */ |
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559 |
|
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560 #endif /* SOUND_SUPPORTS_VOC */ |
| 14 | 561 |
| 562 /* end of voc.c ... */ |