interpretor/lib/src/libsndfile-1.0.25/src/vox_adpcm.c

   1 /*
   2 ** Copyright (C) 2002-2011 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 /*
  20 **      This is the OKI / Dialogic ADPCM encoder/decoder. It converts from
  21 **      12 bit linear sample data to a 4 bit ADPCM.
  22 */
  23
  24 /*
  25  * Note: some early Dialogic hardware does not always reset the ADPCM encoder
  26  * at the start of each vox file. This can result in clipping and/or DC offset
  27  * problems when it comes to decoding the audio. Whilst little can be done
  28  * about the clipping, a DC offset can be removed by passing the decoded audio
  29  * through a high-pass filter at e.g. 10Hz.
  30  */
  31
  32 #include        "sfconfig.h"
  33
  34 #include        <stdio.h>
  35 #include        <stdlib.h>
  36 #include        <string.h>
  37 #include        <math.h>
  38
  39 #include        "sndfile.h"
  40 #include        "sfendian.h"
  41 #include        "common.h"
  42 #include        "ima_oki_adpcm.h"
  43
  44
  45 static sf_count_t vox_read_s (SF_PRIVATE *psf, short *ptr, sf_count_t len) ;
  46 static sf_count_t vox_read_i (SF_PRIVATE *psf, int *ptr, sf_count_t len) ;
  47 static sf_count_t vox_read_f (SF_PRIVATE *psf, float *ptr, sf_count_t len) ;
  48 static sf_count_t vox_read_d (SF_PRIVATE *psf, double *ptr, sf_count_t len) ;
  49
  50 static sf_count_t vox_write_s (SF_PRIVATE *psf, const short *ptr, sf_count_t len) ;
  51 static sf_count_t vox_write_i (SF_PRIVATE *psf, const int *ptr, sf_count_t len) ;
  52 static sf_count_t vox_write_f (SF_PRIVATE *psf, const float *ptr, sf_count_t len) ;
  53 static sf_count_t vox_write_d (SF_PRIVATE *psf, const double *ptr, sf_count_t len) ;
  54
  55 static int vox_read_block (SF_PRIVATE *psf, IMA_OKI_ADPCM *pvox, short *ptr, int len) ;
  56
  57 /*------------------------------------------------------------------------------
  58 */
  59
  60 static int
  61 codec_close (SF_PRIVATE * psf)
  62 {
  63         IMA_OKI_ADPCM * p = (IMA_OKI_ADPCM *) psf->codec_data ;
  64
  65         if (p->errors)
  66                 psf_log_printf (psf, "*** Warning : ADPCM state errors: %d\n", p->errors) ;
  67         return p->errors ;
  68 } /* code_close */
  69
  70 int
  71 vox_adpcm_init (SF_PRIVATE *psf)
  72 {       IMA_OKI_ADPCM *pvox = NULL ;
  73
  74         if (psf->file.mode == SFM_RDWR)
  75                 return SFE_BAD_MODE_RW ;
  76
  77         if (psf->file.mode == SFM_WRITE && psf->sf.channels != 1)
  78                 return SFE_CHANNEL_COUNT ;
  79
  80         if ((pvox = malloc (sizeof (IMA_OKI_ADPCM))) == NULL)
  81                 return SFE_MALLOC_FAILED ;
  82
  83         psf->codec_data = (void*) pvox ;
  84         memset (pvox, 0, sizeof (IMA_OKI_ADPCM)) ;
  85
  86         if (psf->file.mode == SFM_WRITE)
  87         {       psf->write_short        = vox_write_s ;
  88                 psf->write_int          = vox_write_i ;
  89                 psf->write_float        = vox_write_f ;
  90                 psf->write_double       = vox_write_d ;
  91                 }
  92         else
  93         {       psf_log_printf (psf, "Header-less OKI Dialogic ADPCM encoded file.\n") ;
  94                 psf_log_printf (psf, "Setting up for 8kHz, mono, Vox ADPCM.\n") ;
  95
  96                 psf->read_short         = vox_read_s ;
  97                 psf->read_int           = vox_read_i ;
  98                 psf->read_float         = vox_read_f ;
  99                 psf->read_double        = vox_read_d ;
 100                 } ;
 101
 102         /* Standard sample rate chennels etc. */
 103         if (psf->sf.samplerate < 1)
 104                 psf->sf.samplerate      = 8000 ;
 105         psf->sf.channels        = 1 ;
 106
 107         psf->sf.frames = psf->filelength * 2 ;
 108
 109         psf->sf.seekable = SF_FALSE ;
 110         psf->codec_close = codec_close ;
 111
 112         /* Seek back to start of data. */
 113         if (psf_fseek (psf, 0 , SEEK_SET) == -1)
 114                 return SFE_BAD_SEEK ;
 115
 116         ima_oki_adpcm_init (pvox, IMA_OKI_ADPCM_TYPE_OKI) ;
 117
 118         return 0 ;
 119 } /* vox_adpcm_init */
 120
 121 /*==============================================================================
 122 */
 123
 124 static int
 125 vox_read_block (SF_PRIVATE *psf, IMA_OKI_ADPCM *pvox, short *ptr, int len)
 126 {       int     indx = 0, k ;
 127
 128         while (indx < len)
 129         {       pvox->code_count = (len - indx > IMA_OKI_ADPCM_PCM_LEN) ? IMA_OKI_ADPCM_CODE_LEN : (len - indx + 1) / 2 ;
 130
 131                 if ((k = psf_fread (pvox->codes, 1, pvox->code_count, psf)) != pvox->code_count)
 132                 {       if (psf_ftell (psf) != psf->filelength)
 133                                 psf_log_printf (psf, "*** Warning : short read (%d != %d).\n", k, pvox->code_count) ;
 134                         if (k == 0)
 135                                 break ;
 136                         } ;
 137
 138                 pvox->code_count = k ;
 139
 140                 ima_oki_adpcm_decode_block (pvox) ;
 141
 142                 memcpy (&(ptr [indx]), pvox->pcm, pvox->pcm_count * sizeof (short)) ;
 143                 indx += pvox->pcm_count ;
 144                 } ;
 145
 146         return indx ;
 147 } /* vox_read_block */
 148
 149
 150 static sf_count_t
 151 vox_read_s (SF_PRIVATE *psf, short *ptr, sf_count_t len)
 152 {       IMA_OKI_ADPCM   *pvox ;
 153         int                     readcount, count ;
 154         sf_count_t      total = 0 ;
 155
 156         if (! psf->codec_data)
 157                 return 0 ;
 158         pvox = (IMA_OKI_ADPCM*) psf->codec_data ;
 159
 160         while (len > 0)
 161         {       readcount = (len > 0x10000000) ? 0x10000000 : (int) len ;
 162
 163                 count = vox_read_block (psf, pvox, ptr, readcount) ;
 164
 165                 total += count ;
 166                 len -= count ;
 167                 if (count != readcount)
 168                         break ;
 169                 } ;
 170
 171         return total ;
 172 } /* vox_read_s */
 173
 174 static sf_count_t
 175 vox_read_i      (SF_PRIVATE *psf, int *ptr, sf_count_t len)
 176 {       IMA_OKI_ADPCM *pvox ;
 177         short           *sptr ;
 178         int                     k, bufferlen, readcount, count ;
 179         sf_count_t      total = 0 ;
 180
 181         if (! psf->codec_data)
 182                 return 0 ;
 183         pvox = (IMA_OKI_ADPCM*) psf->codec_data ;
 184
 185         sptr = psf->u.sbuf ;
 186         bufferlen = ARRAY_LEN (psf->u.sbuf) ;
 187         while (len > 0)
 188         {       readcount = (len >= bufferlen) ? bufferlen : (int) len ;
 189                 count = vox_read_block (psf, pvox, sptr, readcount) ;
 190                 for (k = 0 ; k < readcount ; k++)
 191                         ptr [total + k] = ((int) sptr [k]) << 16 ;
 192                 total += count ;
 193                 len -= readcount ;
 194                 if (count != readcount)
 195                         break ;
 196                 } ;
 197
 198         return total ;
 199 } /* vox_read_i */
 200
 201 static sf_count_t
 202 vox_read_f (SF_PRIVATE *psf, float *ptr, sf_count_t len)
 203 {       IMA_OKI_ADPCM *pvox ;
 204         short           *sptr ;
 205         int                     k, bufferlen, readcount, count ;
 206         sf_count_t      total = 0 ;
 207         float           normfact ;
 208
 209         if (! psf->codec_data)
 210                 return 0 ;
 211         pvox = (IMA_OKI_ADPCM*) psf->codec_data ;
 212
 213         normfact = (psf->norm_float == SF_TRUE) ? 1.0 / ((float) 0x8000) : 1.0 ;
 214
 215         sptr = psf->u.sbuf ;
 216         bufferlen = ARRAY_LEN (psf->u.sbuf) ;
 217         while (len > 0)
 218         {       readcount = (len >= bufferlen) ? bufferlen : (int) len ;
 219                 count = vox_read_block (psf, pvox, sptr, readcount) ;
 220                 for (k = 0 ; k < readcount ; k++)
 221                         ptr [total + k] = normfact * (float) (sptr [k]) ;
 222                 total += count ;
 223                 len -= readcount ;
 224                 if (count != readcount)
 225                         break ;
 226                 } ;
 227
 228         return total ;
 229 } /* vox_read_f */
 230
 231 static sf_count_t
 232 vox_read_d (SF_PRIVATE *psf, double *ptr, sf_count_t len)
 233 {       IMA_OKI_ADPCM *pvox ;
 234         short           *sptr ;
 235         int                     k, bufferlen, readcount, count ;
 236         sf_count_t      total = 0 ;
 237         double          normfact ;
 238
 239         if (! psf->codec_data)
 240                 return 0 ;
 241         pvox = (IMA_OKI_ADPCM*) psf->codec_data ;
 242
 243         normfact = (psf->norm_double == SF_TRUE) ? 1.0 / ((double) 0x8000) : 1.0 ;
 244
 245         sptr = psf->u.sbuf ;
 246         bufferlen = ARRAY_LEN (psf->u.sbuf) ;
 247         while (len > 0)
 248         {       readcount = (len >= bufferlen) ? bufferlen : (int) len ;
 249                 count = vox_read_block (psf, pvox, sptr, readcount) ;
 250                 for (k = 0 ; k < readcount ; k++)
 251                         ptr [total + k] = normfact * (double) (sptr [k]) ;
 252                 total += count ;
 253                 len -= readcount ;
 254                 if (count != readcount)
 255                         break ;
 256                 } ;
 257
 258         return total ;
 259 } /* vox_read_d */
 260
 261 /*------------------------------------------------------------------------------
 262 */
 263
 264 static int
 265 vox_write_block (SF_PRIVATE *psf, IMA_OKI_ADPCM *pvox, const short *ptr, int len)
 266 {       int     indx = 0, k ;
 267
 268         while (indx < len)
 269         {       pvox->pcm_count = (len - indx > IMA_OKI_ADPCM_PCM_LEN) ? IMA_OKI_ADPCM_PCM_LEN : len - indx ;
 270
 271                 memcpy (pvox->pcm, &(ptr [indx]), pvox->pcm_count * sizeof (short)) ;
 272
 273                 ima_oki_adpcm_encode_block (pvox) ;
 274
 275                 if ((k = psf_fwrite (pvox->codes, 1, pvox->code_count, psf)) != pvox->code_count)
 276                         psf_log_printf (psf, "*** Warning : short write (%d != %d).\n", k, pvox->code_count) ;
 277
 278                 indx += pvox->pcm_count ;
 279                 } ;
 280
 281         return indx ;
 282 } /* vox_write_block */
 283
 284 static sf_count_t
 285 vox_write_s (SF_PRIVATE *psf, const short *ptr, sf_count_t len)
 286 {       IMA_OKI_ADPCM   *pvox ;
 287         int                     writecount, count ;
 288         sf_count_t      total = 0 ;
 289
 290         if (! psf->codec_data)
 291                 return 0 ;
 292         pvox = (IMA_OKI_ADPCM*) psf->codec_data ;
 293
 294         while (len)
 295         {       writecount = (len > 0x10000000) ? 0x10000000 : (int) len ;
 296
 297                 count = vox_write_block (psf, pvox, ptr, writecount) ;
 298
 299                 total += count ;
 300                 len -= count ;
 301                 if (count != writecount)
 302                         break ;
 303                 } ;
 304
 305         return total ;
 306 } /* vox_write_s */
 307
 308 static sf_count_t
 309 vox_write_i     (SF_PRIVATE *psf, const int *ptr, sf_count_t len)
 310 {       IMA_OKI_ADPCM *pvox ;
 311         short           *sptr ;
 312         int                     k, bufferlen, writecount, count ;
 313         sf_count_t      total = 0 ;
 314
 315         if (! psf->codec_data)
 316                 return 0 ;
 317         pvox = (IMA_OKI_ADPCM*) psf->codec_data ;
 318
 319         sptr = psf->u.sbuf ;
 320         bufferlen = ARRAY_LEN (psf->u.sbuf) ;
 321         while (len > 0)
 322         {       writecount = (len >= bufferlen) ? bufferlen : (int) len ;
 323                 for (k = 0 ; k < writecount ; k++)
 324                         sptr [k] = ptr [total + k] >> 16 ;
 325                 count = vox_write_block (psf, pvox, sptr, writecount) ;
 326                 total += count ;
 327                 len -= writecount ;
 328                 if (count != writecount)
 329                         break ;
 330                 } ;
 331
 332         return total ;
 333 } /* vox_write_i */
 334
 335 static sf_count_t
 336 vox_write_f (SF_PRIVATE *psf, const float *ptr, sf_count_t len)
 337 {       IMA_OKI_ADPCM *pvox ;
 338         short           *sptr ;
 339         int                     k, bufferlen, writecount, count ;
 340         sf_count_t      total = 0 ;
 341         float           normfact ;
 342
 343         if (! psf->codec_data)
 344                 return 0 ;
 345         pvox = (IMA_OKI_ADPCM*) psf->codec_data ;
 346
 347         normfact = (psf->norm_float == SF_TRUE) ? (1.0 * 0x7FFF) : 1.0 ;
 348
 349         sptr = psf->u.sbuf ;
 350         bufferlen = ARRAY_LEN (psf->u.sbuf) ;
 351         while (len > 0)
 352         {       writecount = (len >= bufferlen) ? bufferlen : (int) len ;
 353                 for (k = 0 ; k < writecount ; k++)
 354                         sptr [k] = lrintf (normfact * ptr [total + k]) ;
 355                 count = vox_write_block (psf, pvox, sptr, writecount) ;
 356                 total += count ;
 357                 len -= writecount ;
 358                 if (count != writecount)
 359                         break ;
 360                 } ;
 361
 362         return total ;
 363 } /* vox_write_f */
 364
 365 static sf_count_t
 366 vox_write_d     (SF_PRIVATE *psf, const double *ptr, sf_count_t len)
 367 {       IMA_OKI_ADPCM *pvox ;
 368         short           *sptr ;
 369         int                     k, bufferlen, writecount, count ;
 370         sf_count_t      total = 0 ;
 371         double          normfact ;
 372
 373         if (! psf->codec_data)
 374                 return 0 ;
 375         pvox = (IMA_OKI_ADPCM*) psf->codec_data ;
 376
 377         normfact = (psf->norm_double == SF_TRUE) ? (1.0 * 0x7FFF) : 1.0 ;
 378
 379         sptr = psf->u.sbuf ;
 380         bufferlen = ARRAY_LEN (psf->u.sbuf) ;
 381         while (len > 0)
 382         {       writecount = (len >= bufferlen) ? bufferlen : (int) len ;
 383                 for (k = 0 ; k < writecount ; k++)
 384                         sptr [k] = lrint (normfact * ptr [total + k]) ;
 385                 count = vox_write_block (psf, pvox, sptr, writecount) ;
 386                 total += count ;
 387                 len -= writecount ;
 388                 if (count != writecount)
 389                         break ;
 390                 } ;
 391
 392         return total ;
 393 } /* vox_write_d */
 394