579a5d07aadb63b578ed3b96aeeab3d40c18eb26
[Faustine.git] / 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