Alexandre Lision | 7c6f4a6 | 2013-09-05 13:27:01 -0400 | [diff] [blame] | 1 | /* |
| 2 | ** Copyright (C) 1999-2011 Erik de Castro Lopo <erikd@mega-nerd.com> |
| 3 | ** |
| 4 | ** This program is free software; you can redistribute it and/or modify |
| 5 | ** it under the terms of the GNU Lesser General Public License as published by |
| 6 | ** the Free Software Foundation; either version 2.1 of the License, or |
| 7 | ** (at your option) any later version. |
| 8 | ** |
| 9 | ** This program is distributed in the hope that it will be useful, |
| 10 | ** but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | ** GNU Lesser General Public License for more details. |
| 13 | ** |
| 14 | ** You should have received a copy of the GNU Lesser General Public License |
| 15 | ** along with this program; if not, write to the Free Software |
| 16 | ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #include "sfconfig.h" |
| 20 | |
| 21 | #include <stdio.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | #include <math.h> |
| 25 | |
| 26 | #include "sndfile.h" |
| 27 | #include "sfendian.h" |
| 28 | #include "common.h" |
| 29 | |
| 30 | typedef struct IMA_ADPCM_PRIVATE_tag |
| 31 | { int (*decode_block) (SF_PRIVATE *psf, struct IMA_ADPCM_PRIVATE_tag *pima) ; |
| 32 | int (*encode_block) (SF_PRIVATE *psf, struct IMA_ADPCM_PRIVATE_tag *pima) ; |
| 33 | |
| 34 | int channels, blocksize, samplesperblock, blocks ; |
| 35 | int blockcount, samplecount ; |
| 36 | int previous [2] ; |
| 37 | int stepindx [2] ; |
| 38 | unsigned char *block ; |
| 39 | short *samples ; |
| 40 | #if HAVE_FLEXIBLE_ARRAY |
| 41 | short data [] ; /* ISO C99 struct flexible array. */ |
| 42 | #else |
| 43 | short data [0] ; /* This is a hack and might not work. */ |
| 44 | #endif |
| 45 | } IMA_ADPCM_PRIVATE ; |
| 46 | |
| 47 | /*============================================================================================ |
| 48 | ** Predefined IMA ADPCM data. |
| 49 | */ |
| 50 | |
| 51 | static int ima_indx_adjust [16] = |
| 52 | { -1, -1, -1, -1, /* +0 - +3, decrease the step size */ |
| 53 | 2, 4, 6, 8, /* +4 - +7, increase the step size */ |
| 54 | -1, -1, -1, -1, /* -0 - -3, decrease the step size */ |
| 55 | 2, 4, 6, 8, /* -4 - -7, increase the step size */ |
| 56 | } ; |
| 57 | |
| 58 | static int ima_step_size [89] = |
| 59 | { 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 19, 21, 23, 25, 28, 31, 34, 37, 41, 45, |
| 60 | 50, 55, 60, 66, 73, 80, 88, 97, 107, 118, 130, 143, 157, 173, 190, 209, 230, |
| 61 | 253, 279, 307, 337, 371, 408, 449, 494, 544, 598, 658, 724, 796, 876, 963, |
| 62 | 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024, 3327, |
| 63 | 3660, 4026, 4428, 4871, 5358, 5894, 6484, 7132, 7845, 8630, 9493, 10442, |
| 64 | 11487, 12635, 13899, 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, |
| 65 | 32767 |
| 66 | } ; |
| 67 | |
| 68 | static int ima_reader_init (SF_PRIVATE *psf, int blockalign, int samplesperblock) ; |
| 69 | static int ima_writer_init (SF_PRIVATE *psf, int blockalign) ; |
| 70 | |
| 71 | static int ima_read_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima, short *ptr, int len) ; |
| 72 | static int ima_write_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima, const short *ptr, int len) ; |
| 73 | |
| 74 | static sf_count_t ima_read_s (SF_PRIVATE *psf, short *ptr, sf_count_t len) ; |
| 75 | static sf_count_t ima_read_i (SF_PRIVATE *psf, int *ptr, sf_count_t len) ; |
| 76 | static sf_count_t ima_read_f (SF_PRIVATE *psf, float *ptr, sf_count_t len) ; |
| 77 | static sf_count_t ima_read_d (SF_PRIVATE *psf, double *ptr, sf_count_t len) ; |
| 78 | |
| 79 | static sf_count_t ima_write_s (SF_PRIVATE *psf, const short *ptr, sf_count_t len) ; |
| 80 | static sf_count_t ima_write_i (SF_PRIVATE *psf, const int *ptr, sf_count_t len) ; |
| 81 | static sf_count_t ima_write_f (SF_PRIVATE *psf, const float *ptr, sf_count_t len) ; |
| 82 | static sf_count_t ima_write_d (SF_PRIVATE *psf, const double *ptr, sf_count_t len) ; |
| 83 | |
| 84 | static sf_count_t ima_seek (SF_PRIVATE *psf, int mode, sf_count_t offset) ; |
| 85 | |
| 86 | static int ima_close (SF_PRIVATE *psf) ; |
| 87 | |
| 88 | static int wav_w64_ima_decode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) ; |
| 89 | static int wav_w64_ima_encode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) ; |
| 90 | |
| 91 | /*-static int aiff_ima_reader_init (SF_PRIVATE *psf, int blockalign, int samplesperblock) ;-*/ |
| 92 | static int aiff_ima_decode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) ; |
| 93 | static int aiff_ima_encode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) ; |
| 94 | |
| 95 | |
| 96 | static inline int |
| 97 | clamp_ima_step_index (int indx) |
| 98 | { if (indx < 0) |
| 99 | return 0 ; |
| 100 | if (indx >= ARRAY_LEN (ima_step_size)) |
| 101 | return ARRAY_LEN (ima_step_size) - 1 ; |
| 102 | |
| 103 | return indx ; |
| 104 | } /* clamp_ima_step_index */ |
| 105 | |
| 106 | /*============================================================================================ |
| 107 | ** IMA ADPCM Reader initialisation function. |
| 108 | */ |
| 109 | |
| 110 | int |
| 111 | wav_w64_ima_init (SF_PRIVATE *psf, int blockalign, int samplesperblock) |
| 112 | { int error ; |
| 113 | |
| 114 | if (psf->codec_data != NULL) |
| 115 | { psf_log_printf (psf, "*** psf->codec_data is not NULL.\n") ; |
| 116 | return SFE_INTERNAL ; |
| 117 | } ; |
| 118 | |
| 119 | if (psf->file.mode == SFM_RDWR) |
| 120 | return SFE_BAD_MODE_RW ; |
| 121 | |
| 122 | if (psf->file.mode == SFM_READ) |
| 123 | if ((error = ima_reader_init (psf, blockalign, samplesperblock))) |
| 124 | return error ; |
| 125 | |
| 126 | if (psf->file.mode == SFM_WRITE) |
| 127 | if ((error = ima_writer_init (psf, blockalign))) |
| 128 | return error ; |
| 129 | |
| 130 | psf->codec_close = ima_close ; |
| 131 | psf->seek = ima_seek ; |
| 132 | |
| 133 | return 0 ; |
| 134 | } /* wav_w64_ima_init */ |
| 135 | |
| 136 | int |
| 137 | aiff_ima_init (SF_PRIVATE *psf, int blockalign, int samplesperblock) |
| 138 | { int error ; |
| 139 | |
| 140 | if (psf->file.mode == SFM_RDWR) |
| 141 | return SFE_BAD_MODE_RW ; |
| 142 | |
| 143 | if (psf->file.mode == SFM_READ) |
| 144 | if ((error = ima_reader_init (psf, blockalign, samplesperblock))) |
| 145 | return error ; |
| 146 | |
| 147 | if (psf->file.mode == SFM_WRITE) |
| 148 | if ((error = ima_writer_init (psf, blockalign))) |
| 149 | return error ; |
| 150 | |
| 151 | psf->codec_close = ima_close ; |
| 152 | |
| 153 | return 0 ; |
| 154 | } /* aiff_ima_init */ |
| 155 | |
| 156 | static int |
| 157 | ima_close (SF_PRIVATE *psf) |
| 158 | { IMA_ADPCM_PRIVATE *pima ; |
| 159 | |
| 160 | pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ; |
| 161 | |
| 162 | if (psf->file.mode == SFM_WRITE) |
| 163 | { /* If a block has been partially assembled, write it out |
| 164 | ** as the final block. |
| 165 | */ |
| 166 | if (pima->samplecount && pima->samplecount < pima->samplesperblock) |
| 167 | pima->encode_block (psf, pima) ; |
| 168 | |
| 169 | psf->sf.frames = pima->samplesperblock * pima->blockcount / psf->sf.channels ; |
| 170 | } ; |
| 171 | |
| 172 | return 0 ; |
| 173 | } /* ima_close */ |
| 174 | |
| 175 | /*============================================================================================ |
| 176 | ** IMA ADPCM Read Functions. |
| 177 | */ |
| 178 | |
| 179 | static int |
| 180 | ima_reader_init (SF_PRIVATE *psf, int blockalign, int samplesperblock) |
| 181 | { IMA_ADPCM_PRIVATE *pima ; |
| 182 | int pimasize, count ; |
| 183 | |
| 184 | if (psf->file.mode != SFM_READ) |
| 185 | return SFE_BAD_MODE_RW ; |
| 186 | |
| 187 | pimasize = sizeof (IMA_ADPCM_PRIVATE) + blockalign * psf->sf.channels + 3 * psf->sf.channels * samplesperblock ; |
| 188 | |
| 189 | if (! (pima = calloc (1, pimasize))) |
| 190 | return SFE_MALLOC_FAILED ; |
| 191 | |
| 192 | psf->codec_data = (void*) pima ; |
| 193 | |
| 194 | pima->samples = pima->data ; |
| 195 | pima->block = (unsigned char*) (pima->data + samplesperblock * psf->sf.channels) ; |
| 196 | |
| 197 | pima->channels = psf->sf.channels ; |
| 198 | pima->blocksize = blockalign ; |
| 199 | pima->samplesperblock = samplesperblock ; |
| 200 | |
| 201 | psf->filelength = psf_get_filelen (psf) ; |
| 202 | psf->datalength = (psf->dataend) ? psf->dataend - psf->dataoffset : |
| 203 | psf->filelength - psf->dataoffset ; |
| 204 | |
| 205 | if (pima->blocksize == 0) |
| 206 | { psf_log_printf (psf, "*** Error : pima->blocksize should not be zero.\n") ; |
| 207 | return SFE_INTERNAL ; |
| 208 | } ; |
| 209 | |
| 210 | if (psf->datalength % pima->blocksize) |
| 211 | pima->blocks = psf->datalength / pima->blocksize + 1 ; |
| 212 | else |
| 213 | pima->blocks = psf->datalength / pima->blocksize ; |
| 214 | |
| 215 | switch (SF_CONTAINER (psf->sf.format)) |
| 216 | { case SF_FORMAT_WAV : |
| 217 | case SF_FORMAT_W64 : |
| 218 | count = 2 * (pima->blocksize - 4 * pima->channels) / pima->channels + 1 ; |
| 219 | |
| 220 | if (pima->samplesperblock != count) |
| 221 | { psf_log_printf (psf, "*** Error : samplesperblock should be %d.\n", count) ; |
| 222 | return SFE_INTERNAL ; |
| 223 | } ; |
| 224 | |
| 225 | pima->decode_block = wav_w64_ima_decode_block ; |
| 226 | |
| 227 | psf->sf.frames = pima->samplesperblock * pima->blocks ; |
| 228 | break ; |
| 229 | |
| 230 | case SF_FORMAT_AIFF : |
| 231 | psf_log_printf (psf, "still need to check block count\n") ; |
| 232 | pima->decode_block = aiff_ima_decode_block ; |
| 233 | psf->sf.frames = pima->samplesperblock * pima->blocks / pima->channels ; |
| 234 | break ; |
| 235 | |
| 236 | default : |
| 237 | psf_log_printf (psf, "ima_reader_init: bad psf->sf.format\n") ; |
| 238 | return SFE_INTERNAL ; |
| 239 | } ; |
| 240 | |
| 241 | pima->decode_block (psf, pima) ; /* Read first block. */ |
| 242 | |
| 243 | psf->read_short = ima_read_s ; |
| 244 | psf->read_int = ima_read_i ; |
| 245 | psf->read_float = ima_read_f ; |
| 246 | psf->read_double = ima_read_d ; |
| 247 | |
| 248 | return 0 ; |
| 249 | } /* ima_reader_init */ |
| 250 | |
| 251 | static int |
| 252 | aiff_ima_decode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) |
| 253 | { unsigned char *blockdata ; |
| 254 | int chan, k, diff, bytecode, predictor ; |
| 255 | short step, stepindx, *sampledata ; |
| 256 | |
| 257 | static int count = 0 ; |
| 258 | count ++ ; |
| 259 | |
| 260 | pima->blockcount += pima->channels ; |
| 261 | pima->samplecount = 0 ; |
| 262 | |
| 263 | if (pima->blockcount > pima->blocks) |
| 264 | { memset (pima->samples, 0, pima->samplesperblock * pima->channels * sizeof (short)) ; |
| 265 | return 1 ; |
| 266 | } ; |
| 267 | |
| 268 | if ((k = psf_fread (pima->block, 1, pima->blocksize * pima->channels, psf)) != pima->blocksize * pima->channels) |
| 269 | psf_log_printf (psf, "*** Warning : short read (%d != %d).\n", k, pima->blocksize) ; |
| 270 | |
| 271 | /* Read and check the block header. */ |
| 272 | for (chan = 0 ; chan < pima->channels ; chan++) |
| 273 | { blockdata = pima->block + chan * 34 ; |
| 274 | sampledata = pima->samples + chan ; |
| 275 | |
| 276 | predictor = (blockdata [0] << 8) | (blockdata [1] & 0x80) ; |
| 277 | |
| 278 | stepindx = blockdata [1] & 0x7F ; |
| 279 | stepindx = clamp_ima_step_index (stepindx) ; |
| 280 | |
| 281 | /* |
| 282 | ** Pull apart the packed 4 bit samples and store them in their |
| 283 | ** correct sample positions. |
| 284 | */ |
| 285 | for (k = 0 ; k < pima->blocksize - 2 ; k++) |
| 286 | { bytecode = blockdata [k + 2] ; |
| 287 | sampledata [pima->channels * (2 * k + 0)] = bytecode & 0xF ; |
| 288 | sampledata [pima->channels * (2 * k + 1)] = (bytecode >> 4) & 0xF ; |
| 289 | } ; |
| 290 | |
| 291 | /* Decode the encoded 4 bit samples. */ |
| 292 | for (k = 0 ; k < pima->samplesperblock ; k ++) |
| 293 | { step = ima_step_size [stepindx] ; |
| 294 | |
| 295 | bytecode = pima->samples [pima->channels * k + chan] ; |
| 296 | |
| 297 | stepindx += ima_indx_adjust [bytecode] ; |
| 298 | stepindx = clamp_ima_step_index (stepindx) ; |
| 299 | |
| 300 | diff = step >> 3 ; |
| 301 | if (bytecode & 1) diff += step >> 2 ; |
| 302 | if (bytecode & 2) diff += step >> 1 ; |
| 303 | if (bytecode & 4) diff += step ; |
| 304 | if (bytecode & 8) diff = -diff ; |
| 305 | |
| 306 | predictor += diff ; |
| 307 | if (predictor < -32768) |
| 308 | predictor = -32768 ; |
| 309 | else if (predictor > 32767) |
| 310 | predictor = 32767 ; |
| 311 | |
| 312 | pima->samples [pima->channels * k + chan] = predictor ; |
| 313 | } ; |
| 314 | } ; |
| 315 | |
| 316 | return 1 ; |
| 317 | } /* aiff_ima_decode_block */ |
| 318 | |
| 319 | static int |
| 320 | aiff_ima_encode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) |
| 321 | { int chan, k, step, diff, vpdiff, blockindx, indx ; |
| 322 | short bytecode, mask ; |
| 323 | |
| 324 | /* Encode the block header. */ |
| 325 | for (chan = 0 ; chan < pima->channels ; chan ++) |
| 326 | { blockindx = chan * pima->blocksize ; |
| 327 | |
| 328 | pima->block [blockindx] = (pima->samples [chan] >> 8) & 0xFF ; |
| 329 | pima->block [blockindx + 1] = (pima->samples [chan] & 0x80) + (pima->stepindx [chan] & 0x7F) ; |
| 330 | |
| 331 | pima->previous [chan] = pima->samples [chan] ; |
| 332 | } ; |
| 333 | |
| 334 | /* Encode second and later samples for every block as a 4 bit value. */ |
| 335 | for (k = pima->channels ; k < (pima->samplesperblock * pima->channels) ; k ++) |
| 336 | { chan = (pima->channels > 1) ? (k % 2) : 0 ; |
| 337 | |
| 338 | diff = pima->samples [k] - pima->previous [chan] ; |
| 339 | |
| 340 | bytecode = 0 ; |
| 341 | step = ima_step_size [pima->stepindx [chan]] ; |
| 342 | vpdiff = step >> 3 ; |
| 343 | if (diff < 0) |
| 344 | { bytecode = 8 ; |
| 345 | diff = -diff ; |
| 346 | } ; |
| 347 | mask = 4 ; |
| 348 | while (mask) |
| 349 | { if (diff >= step) |
| 350 | { bytecode |= mask ; |
| 351 | diff -= step ; |
| 352 | vpdiff += step ; |
| 353 | } ; |
| 354 | step >>= 1 ; |
| 355 | mask >>= 1 ; |
| 356 | } ; |
| 357 | |
| 358 | if (bytecode & 8) |
| 359 | pima->previous [chan] -= vpdiff ; |
| 360 | else |
| 361 | pima->previous [chan] += vpdiff ; |
| 362 | |
| 363 | if (pima->previous [chan] > 32767) |
| 364 | pima->previous [chan] = 32767 ; |
| 365 | else if (pima->previous [chan] < -32768) |
| 366 | pima->previous [chan] = -32768 ; |
| 367 | |
| 368 | pima->stepindx [chan] += ima_indx_adjust [bytecode] ; |
| 369 | |
| 370 | pima->stepindx [chan] = clamp_ima_step_index (pima->stepindx [chan]) ; |
| 371 | pima->samples [k] = bytecode ; |
| 372 | } ; |
| 373 | |
| 374 | /* Pack the 4 bit encoded samples. */ |
| 375 | |
| 376 | for (chan = 0 ; chan < pima->channels ; chan ++) |
| 377 | { for (indx = pima->channels ; indx < pima->channels * pima->samplesperblock ; indx += 2 * pima->channels) |
| 378 | { blockindx = chan * pima->blocksize + 2 + indx / 2 ; |
| 379 | |
| 380 | pima->block [blockindx] = pima->samples [indx] & 0x0F ; |
| 381 | pima->block [blockindx] |= (pima->samples [indx + chan] << 4) & 0xF0 ; |
| 382 | } ; |
| 383 | } ; |
| 384 | |
| 385 | /* Write the block to disk. */ |
| 386 | |
| 387 | if ((k = psf_fwrite (pima->block, 1, pima->channels * pima->blocksize, psf)) != pima->channels * pima->blocksize) |
| 388 | psf_log_printf (psf, "*** Warning : short write (%d != %d).\n", k, pima->channels * pima->blocksize) ; |
| 389 | |
| 390 | memset (pima->samples, 0, pima->channels * pima->samplesperblock * sizeof (short)) ; |
| 391 | pima->samplecount = 0 ; |
| 392 | pima->blockcount ++ ; |
| 393 | |
| 394 | return 1 ; |
| 395 | } /* aiff_ima_encode_block */ |
| 396 | |
| 397 | static int |
| 398 | wav_w64_ima_decode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) |
| 399 | { int chan, k, predictor, blockindx, indx, indxstart, diff ; |
| 400 | short step, bytecode, stepindx [2] ; |
| 401 | |
| 402 | pima->blockcount ++ ; |
| 403 | pima->samplecount = 0 ; |
| 404 | |
| 405 | if (pima->blockcount > pima->blocks) |
| 406 | { memset (pima->samples, 0, pima->samplesperblock * pima->channels * sizeof (short)) ; |
| 407 | return 1 ; |
| 408 | } ; |
| 409 | |
| 410 | if ((k = psf_fread (pima->block, 1, pima->blocksize, psf)) != pima->blocksize) |
| 411 | psf_log_printf (psf, "*** Warning : short read (%d != %d).\n", k, pima->blocksize) ; |
| 412 | |
| 413 | /* Read and check the block header. */ |
| 414 | |
| 415 | for (chan = 0 ; chan < pima->channels ; chan++) |
| 416 | { predictor = pima->block [chan*4] | (pima->block [chan*4+1] << 8) ; |
| 417 | if (predictor & 0x8000) |
| 418 | predictor -= 0x10000 ; |
| 419 | |
| 420 | stepindx [chan] = pima->block [chan*4+2] ; |
| 421 | stepindx [chan] = clamp_ima_step_index (stepindx [chan]) ; |
| 422 | |
| 423 | |
| 424 | if (pima->block [chan*4+3] != 0) |
| 425 | psf_log_printf (psf, "IMA ADPCM synchronisation error.\n") ; |
| 426 | |
| 427 | pima->samples [chan] = predictor ; |
| 428 | } ; |
| 429 | |
| 430 | /* |
| 431 | ** Pull apart the packed 4 bit samples and store them in their |
| 432 | ** correct sample positions. |
| 433 | */ |
| 434 | |
| 435 | blockindx = 4 * pima->channels ; |
| 436 | |
| 437 | indxstart = pima->channels ; |
| 438 | while (blockindx < pima->blocksize) |
| 439 | { for (chan = 0 ; chan < pima->channels ; chan++) |
| 440 | { indx = indxstart + chan ; |
| 441 | for (k = 0 ; k < 4 ; k++) |
| 442 | { bytecode = pima->block [blockindx++] ; |
| 443 | pima->samples [indx] = bytecode & 0x0F ; |
| 444 | indx += pima->channels ; |
| 445 | pima->samples [indx] = (bytecode >> 4) & 0x0F ; |
| 446 | indx += pima->channels ; |
| 447 | } ; |
| 448 | } ; |
| 449 | indxstart += 8 * pima->channels ; |
| 450 | } ; |
| 451 | |
| 452 | /* Decode the encoded 4 bit samples. */ |
| 453 | |
| 454 | for (k = pima->channels ; k < (pima->samplesperblock * pima->channels) ; k ++) |
| 455 | { chan = (pima->channels > 1) ? (k % 2) : 0 ; |
| 456 | |
| 457 | bytecode = pima->samples [k] & 0xF ; |
| 458 | |
| 459 | step = ima_step_size [stepindx [chan]] ; |
| 460 | predictor = pima->samples [k - pima->channels] ; |
| 461 | |
| 462 | diff = step >> 3 ; |
| 463 | if (bytecode & 1) |
| 464 | diff += step >> 2 ; |
| 465 | if (bytecode & 2) |
| 466 | diff += step >> 1 ; |
| 467 | if (bytecode & 4) |
| 468 | diff += step ; |
| 469 | if (bytecode & 8) |
| 470 | diff = -diff ; |
| 471 | |
| 472 | predictor += diff ; |
| 473 | |
| 474 | if (predictor > 32767) |
| 475 | predictor = 32767 ; |
| 476 | else if (predictor < -32768) |
| 477 | predictor = -32768 ; |
| 478 | |
| 479 | stepindx [chan] += ima_indx_adjust [bytecode] ; |
| 480 | stepindx [chan] = clamp_ima_step_index (stepindx [chan]) ; |
| 481 | |
| 482 | pima->samples [k] = predictor ; |
| 483 | } ; |
| 484 | |
| 485 | return 1 ; |
| 486 | } /* wav_w64_ima_decode_block */ |
| 487 | |
| 488 | static int |
| 489 | wav_w64_ima_encode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) |
| 490 | { int chan, k, step, diff, vpdiff, blockindx, indx, indxstart ; |
| 491 | short bytecode, mask ; |
| 492 | |
| 493 | /* Encode the block header. */ |
| 494 | for (chan = 0 ; chan < pima->channels ; chan++) |
| 495 | { pima->block [chan*4] = pima->samples [chan] & 0xFF ; |
| 496 | pima->block [chan*4+1] = (pima->samples [chan] >> 8) & 0xFF ; |
| 497 | |
| 498 | pima->block [chan*4+2] = pima->stepindx [chan] ; |
| 499 | pima->block [chan*4+3] = 0 ; |
| 500 | |
| 501 | pima->previous [chan] = pima->samples [chan] ; |
| 502 | } ; |
| 503 | |
| 504 | /* Encode the samples as 4 bit. */ |
| 505 | |
| 506 | for (k = pima->channels ; k < (pima->samplesperblock * pima->channels) ; k ++) |
| 507 | { chan = (pima->channels > 1) ? (k % 2) : 0 ; |
| 508 | |
| 509 | diff = pima->samples [k] - pima->previous [chan] ; |
| 510 | |
| 511 | bytecode = 0 ; |
| 512 | step = ima_step_size [pima->stepindx [chan]] ; |
| 513 | vpdiff = step >> 3 ; |
| 514 | if (diff < 0) |
| 515 | { bytecode = 8 ; |
| 516 | diff = -diff ; |
| 517 | } ; |
| 518 | mask = 4 ; |
| 519 | while (mask) |
| 520 | { if (diff >= step) |
| 521 | { bytecode |= mask ; |
| 522 | diff -= step ; |
| 523 | vpdiff += step ; |
| 524 | } ; |
| 525 | step >>= 1 ; |
| 526 | mask >>= 1 ; |
| 527 | } ; |
| 528 | |
| 529 | if (bytecode & 8) |
| 530 | pima->previous [chan] -= vpdiff ; |
| 531 | else |
| 532 | pima->previous [chan] += vpdiff ; |
| 533 | |
| 534 | if (pima->previous [chan] > 32767) |
| 535 | pima->previous [chan] = 32767 ; |
| 536 | else if (pima->previous [chan] < -32768) |
| 537 | pima->previous [chan] = -32768 ; |
| 538 | |
| 539 | pima->stepindx [chan] += ima_indx_adjust [bytecode] ; |
| 540 | pima->stepindx [chan] = clamp_ima_step_index (pima->stepindx [chan]) ; |
| 541 | |
| 542 | pima->samples [k] = bytecode ; |
| 543 | } ; |
| 544 | |
| 545 | /* Pack the 4 bit encoded samples. */ |
| 546 | |
| 547 | blockindx = 4 * pima->channels ; |
| 548 | |
| 549 | indxstart = pima->channels ; |
| 550 | while (blockindx < pima->blocksize) |
| 551 | { for (chan = 0 ; chan < pima->channels ; chan++) |
| 552 | { indx = indxstart + chan ; |
| 553 | for (k = 0 ; k < 4 ; k++) |
| 554 | { pima->block [blockindx] = pima->samples [indx] & 0x0F ; |
| 555 | indx += pima->channels ; |
| 556 | pima->block [blockindx] |= (pima->samples [indx] << 4) & 0xF0 ; |
| 557 | indx += pima->channels ; |
| 558 | blockindx ++ ; |
| 559 | } ; |
| 560 | } ; |
| 561 | indxstart += 8 * pima->channels ; |
| 562 | } ; |
| 563 | |
| 564 | /* Write the block to disk. */ |
| 565 | |
| 566 | if ((k = psf_fwrite (pima->block, 1, pima->blocksize, psf)) != pima->blocksize) |
| 567 | psf_log_printf (psf, "*** Warning : short write (%d != %d).\n", k, pima->blocksize) ; |
| 568 | |
| 569 | memset (pima->samples, 0, pima->samplesperblock * sizeof (short)) ; |
| 570 | pima->samplecount = 0 ; |
| 571 | pima->blockcount ++ ; |
| 572 | |
| 573 | return 1 ; |
| 574 | } /* wav_w64_ima_encode_block */ |
| 575 | |
| 576 | static int |
| 577 | ima_read_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima, short *ptr, int len) |
| 578 | { int count, total = 0, indx = 0 ; |
| 579 | |
| 580 | while (indx < len) |
| 581 | { if (pima->blockcount >= pima->blocks && pima->samplecount >= pima->samplesperblock) |
| 582 | { memset (&(ptr [indx]), 0, (size_t) ((len - indx) * sizeof (short))) ; |
| 583 | return total ; |
| 584 | } ; |
| 585 | |
| 586 | if (pima->samplecount >= pima->samplesperblock) |
| 587 | pima->decode_block (psf, pima) ; |
| 588 | |
| 589 | count = (pima->samplesperblock - pima->samplecount) * pima->channels ; |
| 590 | count = (len - indx > count) ? count : len - indx ; |
| 591 | |
| 592 | memcpy (&(ptr [indx]), &(pima->samples [pima->samplecount * pima->channels]), count * sizeof (short)) ; |
| 593 | indx += count ; |
| 594 | pima->samplecount += count / pima->channels ; |
| 595 | total = indx ; |
| 596 | } ; |
| 597 | |
| 598 | return total ; |
| 599 | } /* ima_read_block */ |
| 600 | |
| 601 | static sf_count_t |
| 602 | ima_read_s (SF_PRIVATE *psf, short *ptr, sf_count_t len) |
| 603 | { IMA_ADPCM_PRIVATE *pima ; |
| 604 | int readcount, count ; |
| 605 | sf_count_t total = 0 ; |
| 606 | |
| 607 | if (! psf->codec_data) |
| 608 | return 0 ; |
| 609 | pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ; |
| 610 | |
| 611 | while (len > 0) |
| 612 | { readcount = (len > 0x10000000) ? 0x10000000 : (int) len ; |
| 613 | |
| 614 | count = ima_read_block (psf, pima, ptr, readcount) ; |
| 615 | |
| 616 | total += count ; |
| 617 | len -= count ; |
| 618 | if (count != readcount) |
| 619 | break ; |
| 620 | } ; |
| 621 | |
| 622 | return total ; |
| 623 | } /* ima_read_s */ |
| 624 | |
| 625 | static sf_count_t |
| 626 | ima_read_i (SF_PRIVATE *psf, int *ptr, sf_count_t len) |
| 627 | { IMA_ADPCM_PRIVATE *pima ; |
| 628 | short *sptr ; |
| 629 | int k, bufferlen, readcount, count ; |
| 630 | sf_count_t total = 0 ; |
| 631 | |
| 632 | if (! psf->codec_data) |
| 633 | return 0 ; |
| 634 | pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ; |
| 635 | |
| 636 | sptr = psf->u.sbuf ; |
| 637 | bufferlen = ARRAY_LEN (psf->u.sbuf) ; |
| 638 | while (len > 0) |
| 639 | { readcount = (len >= bufferlen) ? bufferlen : (int) len ; |
| 640 | count = ima_read_block (psf, pima, sptr, readcount) ; |
| 641 | for (k = 0 ; k < readcount ; k++) |
| 642 | ptr [total + k] = ((int) sptr [k]) << 16 ; |
| 643 | total += count ; |
| 644 | len -= readcount ; |
| 645 | if (count != readcount) |
| 646 | break ; |
| 647 | } ; |
| 648 | |
| 649 | return total ; |
| 650 | } /* ima_read_i */ |
| 651 | |
| 652 | static sf_count_t |
| 653 | ima_read_f (SF_PRIVATE *psf, float *ptr, sf_count_t len) |
| 654 | { IMA_ADPCM_PRIVATE *pima ; |
| 655 | short *sptr ; |
| 656 | int k, bufferlen, readcount, count ; |
| 657 | sf_count_t total = 0 ; |
| 658 | float normfact ; |
| 659 | |
| 660 | if (! psf->codec_data) |
| 661 | return 0 ; |
| 662 | pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ; |
| 663 | |
| 664 | normfact = (psf->norm_float == SF_TRUE) ? 1.0 / ((float) 0x8000) : 1.0 ; |
| 665 | |
| 666 | sptr = psf->u.sbuf ; |
| 667 | bufferlen = ARRAY_LEN (psf->u.sbuf) ; |
| 668 | while (len > 0) |
| 669 | { readcount = (len >= bufferlen) ? bufferlen : (int) len ; |
| 670 | count = ima_read_block (psf, pima, sptr, readcount) ; |
| 671 | for (k = 0 ; k < readcount ; k++) |
| 672 | ptr [total + k] = normfact * (float) (sptr [k]) ; |
| 673 | total += count ; |
| 674 | len -= readcount ; |
| 675 | if (count != readcount) |
| 676 | break ; |
| 677 | } ; |
| 678 | |
| 679 | return total ; |
| 680 | } /* ima_read_f */ |
| 681 | |
| 682 | static sf_count_t |
| 683 | ima_read_d (SF_PRIVATE *psf, double *ptr, sf_count_t len) |
| 684 | { IMA_ADPCM_PRIVATE *pima ; |
| 685 | short *sptr ; |
| 686 | int k, bufferlen, readcount, count ; |
| 687 | sf_count_t total = 0 ; |
| 688 | double normfact ; |
| 689 | |
| 690 | if (! psf->codec_data) |
| 691 | return 0 ; |
| 692 | pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ; |
| 693 | |
| 694 | normfact = (psf->norm_double == SF_TRUE) ? 1.0 / ((double) 0x8000) : 1.0 ; |
| 695 | |
| 696 | sptr = psf->u.sbuf ; |
| 697 | bufferlen = ARRAY_LEN (psf->u.sbuf) ; |
| 698 | while (len > 0) |
| 699 | { readcount = (len >= bufferlen) ? bufferlen : (int) len ; |
| 700 | count = ima_read_block (psf, pima, sptr, readcount) ; |
| 701 | for (k = 0 ; k < readcount ; k++) |
| 702 | ptr [total + k] = normfact * (double) (sptr [k]) ; |
| 703 | total += count ; |
| 704 | len -= readcount ; |
| 705 | if (count != readcount) |
| 706 | break ; |
| 707 | } ; |
| 708 | |
| 709 | return total ; |
| 710 | } /* ima_read_d */ |
| 711 | |
| 712 | static sf_count_t |
| 713 | ima_seek (SF_PRIVATE *psf, int mode, sf_count_t offset) |
| 714 | { IMA_ADPCM_PRIVATE *pima ; |
| 715 | int newblock, newsample ; |
| 716 | |
| 717 | if (! psf->codec_data) |
| 718 | return 0 ; |
| 719 | pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ; |
| 720 | |
| 721 | if (psf->datalength < 0 || psf->dataoffset < 0) |
| 722 | { psf->error = SFE_BAD_SEEK ; |
| 723 | return PSF_SEEK_ERROR ; |
| 724 | } ; |
| 725 | |
| 726 | if (offset == 0) |
| 727 | { psf_fseek (psf, psf->dataoffset, SEEK_SET) ; |
| 728 | pima->blockcount = 0 ; |
| 729 | pima->decode_block (psf, pima) ; |
| 730 | pima->samplecount = 0 ; |
| 731 | return 0 ; |
| 732 | } ; |
| 733 | |
| 734 | if (offset < 0 || offset > pima->blocks * pima->samplesperblock) |
| 735 | { psf->error = SFE_BAD_SEEK ; |
| 736 | return PSF_SEEK_ERROR ; |
| 737 | } ; |
| 738 | |
| 739 | newblock = offset / pima->samplesperblock ; |
| 740 | newsample = offset % pima->samplesperblock ; |
| 741 | |
| 742 | if (mode == SFM_READ) |
| 743 | { psf_fseek (psf, psf->dataoffset + newblock * pima->blocksize, SEEK_SET) ; |
| 744 | pima->blockcount = newblock ; |
| 745 | pima->decode_block (psf, pima) ; |
| 746 | pima->samplecount = newsample ; |
| 747 | } |
| 748 | else |
| 749 | { /* What to do about write??? */ |
| 750 | psf->error = SFE_BAD_SEEK ; |
| 751 | return PSF_SEEK_ERROR ; |
| 752 | } ; |
| 753 | |
| 754 | return newblock * pima->samplesperblock + newsample ; |
| 755 | } /* ima_seek */ |
| 756 | |
| 757 | /*========================================================================================== |
| 758 | ** IMA ADPCM Write Functions. |
| 759 | */ |
| 760 | |
| 761 | static int |
| 762 | ima_writer_init (SF_PRIVATE *psf, int blockalign) |
| 763 | { IMA_ADPCM_PRIVATE *pima ; |
| 764 | int samplesperblock ; |
| 765 | unsigned int pimasize ; |
| 766 | |
| 767 | if (psf->file.mode != SFM_WRITE) |
| 768 | return SFE_BAD_MODE_RW ; |
| 769 | |
| 770 | samplesperblock = 2 * (blockalign - 4 * psf->sf.channels) / psf->sf.channels + 1 ; |
| 771 | |
| 772 | pimasize = sizeof (IMA_ADPCM_PRIVATE) + blockalign + 3 * psf->sf.channels * samplesperblock ; |
| 773 | |
| 774 | if ((pima = calloc (1, pimasize)) == NULL) |
| 775 | return SFE_MALLOC_FAILED ; |
| 776 | |
| 777 | psf->codec_data = (void*) pima ; |
| 778 | |
| 779 | pima->channels = psf->sf.channels ; |
| 780 | pima->blocksize = blockalign ; |
| 781 | pima->samplesperblock = samplesperblock ; |
| 782 | |
| 783 | pima->block = (unsigned char*) pima->data ; |
| 784 | pima->samples = (short*) (pima->data + blockalign) ; |
| 785 | |
| 786 | pima->samplecount = 0 ; |
| 787 | |
| 788 | switch (SF_CONTAINER (psf->sf.format)) |
| 789 | { case SF_FORMAT_WAV : |
| 790 | case SF_FORMAT_W64 : |
| 791 | pima->encode_block = wav_w64_ima_encode_block ; |
| 792 | break ; |
| 793 | |
| 794 | case SF_FORMAT_AIFF : |
| 795 | pima->encode_block = aiff_ima_encode_block ; |
| 796 | break ; |
| 797 | |
| 798 | default : |
| 799 | psf_log_printf (psf, "ima_reader_init: bad psf->sf.format\n") ; |
| 800 | return SFE_INTERNAL ; |
| 801 | } ; |
| 802 | |
| 803 | psf->write_short = ima_write_s ; |
| 804 | psf->write_int = ima_write_i ; |
| 805 | psf->write_float = ima_write_f ; |
| 806 | psf->write_double = ima_write_d ; |
| 807 | |
| 808 | return 0 ; |
| 809 | } /* ima_writer_init */ |
| 810 | |
| 811 | /*========================================================================================== |
| 812 | */ |
| 813 | |
| 814 | static int |
| 815 | ima_write_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima, const short *ptr, int len) |
| 816 | { int count, total = 0, indx = 0 ; |
| 817 | |
| 818 | while (indx < len) |
| 819 | { count = (pima->samplesperblock - pima->samplecount) * pima->channels ; |
| 820 | |
| 821 | if (count > len - indx) |
| 822 | count = len - indx ; |
| 823 | |
| 824 | memcpy (&(pima->samples [pima->samplecount * pima->channels]), &(ptr [total]), count * sizeof (short)) ; |
| 825 | indx += count ; |
| 826 | pima->samplecount += count / pima->channels ; |
| 827 | total = indx ; |
| 828 | |
| 829 | if (pima->samplecount >= pima->samplesperblock) |
| 830 | pima->encode_block (psf, pima) ; |
| 831 | } ; |
| 832 | |
| 833 | return total ; |
| 834 | } /* ima_write_block */ |
| 835 | |
| 836 | static sf_count_t |
| 837 | ima_write_s (SF_PRIVATE *psf, const short *ptr, sf_count_t len) |
| 838 | { IMA_ADPCM_PRIVATE *pima ; |
| 839 | int writecount, count ; |
| 840 | sf_count_t total = 0 ; |
| 841 | |
| 842 | if (! psf->codec_data) |
| 843 | return 0 ; |
| 844 | pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ; |
| 845 | |
| 846 | while (len) |
| 847 | { writecount = (len > 0x10000000) ? 0x10000000 : (int) len ; |
| 848 | |
| 849 | count = ima_write_block (psf, pima, ptr, writecount) ; |
| 850 | |
| 851 | total += count ; |
| 852 | len -= count ; |
| 853 | if (count != writecount) |
| 854 | break ; |
| 855 | } ; |
| 856 | |
| 857 | return total ; |
| 858 | } /* ima_write_s */ |
| 859 | |
| 860 | static sf_count_t |
| 861 | ima_write_i (SF_PRIVATE *psf, const int *ptr, sf_count_t len) |
| 862 | { IMA_ADPCM_PRIVATE *pima ; |
| 863 | short *sptr ; |
| 864 | int k, bufferlen, writecount, count ; |
| 865 | sf_count_t total = 0 ; |
| 866 | |
| 867 | if (! psf->codec_data) |
| 868 | return 0 ; |
| 869 | pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ; |
| 870 | |
| 871 | sptr = psf->u.sbuf ; |
| 872 | bufferlen = ARRAY_LEN (psf->u.sbuf) ; |
| 873 | while (len > 0) |
| 874 | { writecount = (len >= bufferlen) ? bufferlen : (int) len ; |
| 875 | for (k = 0 ; k < writecount ; k++) |
| 876 | sptr [k] = ptr [total + k] >> 16 ; |
| 877 | count = ima_write_block (psf, pima, sptr, writecount) ; |
| 878 | total += count ; |
| 879 | len -= writecount ; |
| 880 | if (count != writecount) |
| 881 | break ; |
| 882 | } ; |
| 883 | |
| 884 | return total ; |
| 885 | } /* ima_write_i */ |
| 886 | |
| 887 | static sf_count_t |
| 888 | ima_write_f (SF_PRIVATE *psf, const float *ptr, sf_count_t len) |
| 889 | { IMA_ADPCM_PRIVATE *pima ; |
| 890 | short *sptr ; |
| 891 | int k, bufferlen, writecount, count ; |
| 892 | sf_count_t total = 0 ; |
| 893 | float normfact ; |
| 894 | |
| 895 | if (! psf->codec_data) |
| 896 | return 0 ; |
| 897 | pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ; |
| 898 | |
| 899 | normfact = (psf->norm_float == SF_TRUE) ? (1.0 * 0x7FFF) : 1.0 ; |
| 900 | |
| 901 | sptr = psf->u.sbuf ; |
| 902 | bufferlen = ARRAY_LEN (psf->u.sbuf) ; |
| 903 | while (len > 0) |
| 904 | { writecount = (len >= bufferlen) ? bufferlen : (int) len ; |
| 905 | for (k = 0 ; k < writecount ; k++) |
| 906 | sptr [k] = lrintf (normfact * ptr [total + k]) ; |
| 907 | count = ima_write_block (psf, pima, sptr, writecount) ; |
| 908 | total += count ; |
| 909 | len -= writecount ; |
| 910 | if (count != writecount) |
| 911 | break ; |
| 912 | } ; |
| 913 | |
| 914 | return total ; |
| 915 | } /* ima_write_f */ |
| 916 | |
| 917 | static sf_count_t |
| 918 | ima_write_d (SF_PRIVATE *psf, const double *ptr, sf_count_t len) |
| 919 | { IMA_ADPCM_PRIVATE *pima ; |
| 920 | short *sptr ; |
| 921 | int k, bufferlen, writecount, count ; |
| 922 | sf_count_t total = 0 ; |
| 923 | double normfact ; |
| 924 | |
| 925 | if (! psf->codec_data) |
| 926 | return 0 ; |
| 927 | pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ; |
| 928 | |
| 929 | normfact = (psf->norm_double == SF_TRUE) ? (1.0 * 0x7FFF) : 1.0 ; |
| 930 | |
| 931 | sptr = psf->u.sbuf ; |
| 932 | bufferlen = ARRAY_LEN (psf->u.sbuf) ; |
| 933 | while (len > 0) |
| 934 | { writecount = (len >= bufferlen) ? bufferlen : (int) len ; |
| 935 | for (k = 0 ; k < writecount ; k++) |
| 936 | sptr [k] = lrint (normfact * ptr [total + k]) ; |
| 937 | count = ima_write_block (psf, pima, sptr, writecount) ; |
| 938 | total += count ; |
| 939 | len -= writecount ; |
| 940 | if (count != writecount) |
| 941 | break ; |
| 942 | } ; |
| 943 | |
| 944 | return total ; |
| 945 | } /* ima_write_d */ |
| 946 | |