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1.14 ! miko 1: /* $OpenBSD: dsp.c,v 1.13 2018/06/08 06:21:56 ratchov Exp $ */
1.1 ratchov 2: /*
3: * Copyright (c) 2008-2012 Alexandre Ratchov <alex@caoua.org>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: */
17: #include <string.h>
18: #include "dsp.h"
19: #include "utils.h"
20:
21: int aparams_ctltovol[128] = {
22: 0,
23: 256, 266, 276, 287, 299, 310, 323, 335,
24: 348, 362, 376, 391, 406, 422, 439, 456,
25: 474, 493, 512, 532, 553, 575, 597, 621,
26: 645, 670, 697, 724, 753, 782, 813, 845,
27: 878, 912, 948, 985, 1024, 1064, 1106, 1149,
28: 1195, 1241, 1290, 1341, 1393, 1448, 1505, 1564,
29: 1625, 1689, 1756, 1825, 1896, 1971, 2048, 2128,
30: 2212, 2299, 2389, 2483, 2580, 2682, 2787, 2896,
31: 3010, 3128, 3251, 3379, 3511, 3649, 3792, 3941,
32: 4096, 4257, 4424, 4598, 4778, 4966, 5161, 5363,
33: 5574, 5793, 6020, 6256, 6502, 6757, 7023, 7298,
34: 7585, 7883, 8192, 8514, 8848, 9195, 9556, 9931,
35: 10321, 10726, 11148, 11585, 12040, 12513, 13004, 13515,
36: 14045, 14596, 15170, 15765, 16384, 17027, 17696, 18390,
37: 19112, 19863, 20643, 21453, 22295, 23170, 24080, 25025,
38: 26008, 27029, 28090, 29193, 30339, 31530, 32768
39: };
40:
41: /*
42: * Generate a string corresponding to the encoding in par,
43: * return the length of the resulting string.
44: */
45: int
46: aparams_enctostr(struct aparams *par, char *ostr)
47: {
48: char *p = ostr;
49:
50: *p++ = par->sig ? 's' : 'u';
51: if (par->bits > 9)
52: *p++ = '0' + par->bits / 10;
53: *p++ = '0' + par->bits % 10;
54: if (par->bps > 1) {
55: *p++ = par->le ? 'l' : 'b';
56: *p++ = 'e';
57: if (par->bps != APARAMS_BPS(par->bits) ||
58: par->bits < par->bps * 8) {
59: *p++ = par->bps + '0';
60: if (par->bits < par->bps * 8) {
61: *p++ = par->msb ? 'm' : 'l';
62: *p++ = 's';
63: *p++ = 'b';
64: }
65: }
66: }
67: *p++ = '\0';
68: return p - ostr - 1;
69: }
70:
71: /*
72: * Parse an encoding string, examples: s8, u8, s16, s16le, s24be ...
73: * set *istr to the char following the encoding. Return the number
74: * of bytes consumed.
75: */
76: int
77: aparams_strtoenc(struct aparams *par, char *istr)
78: {
79: char *p = istr;
80: int i, sig, bits, le, bps, msb;
81:
82: #define IS_SEP(c) \
83: (((c) < 'a' || (c) > 'z') && \
84: ((c) < 'A' || (c) > 'Z') && \
85: ((c) < '0' || (c) > '9'))
86:
87: /*
88: * get signedness
89: */
90: if (*p == 's') {
91: sig = 1;
92: } else if (*p == 'u') {
93: sig = 0;
94: } else
95: return 0;
96: p++;
97:
98: /*
99: * get number of bits per sample
100: */
101: bits = 0;
102: for (i = 0; i < 2; i++) {
103: if (*p < '0' || *p > '9')
104: break;
105: bits = (bits * 10) + *p - '0';
106: p++;
107: }
108: if (bits < BITS_MIN || bits > BITS_MAX)
109: return 0;
110: bps = APARAMS_BPS(bits);
111: msb = 1;
112: le = ADATA_LE;
113:
114: /*
115: * get (optional) endianness
116: */
117: if (p[0] == 'l' && p[1] == 'e') {
118: le = 1;
119: p += 2;
120: } else if (p[0] == 'b' && p[1] == 'e') {
121: le = 0;
122: p += 2;
123: } else if (IS_SEP(*p)) {
124: goto done;
125: } else
126: return 0;
127:
128: /*
129: * get (optional) number of bytes
130: */
131: if (*p >= '0' && *p <= '9') {
132: bps = *p - '0';
133: if (bps < (bits + 7) / 8 ||
134: bps > (BITS_MAX + 7) / 8)
135: return 0;
136: p++;
137:
138: /*
1.7 nicm 139: * get (optional) alignment
1.1 ratchov 140: */
141: if (p[0] == 'm' && p[1] == 's' && p[2] == 'b') {
142: msb = 1;
143: p += 3;
144: } else if (p[0] == 'l' && p[1] == 's' && p[2] == 'b') {
145: msb = 0;
146: p += 3;
147: } else if (IS_SEP(*p)) {
148: goto done;
149: } else
150: return 0;
151: } else if (!IS_SEP(*p))
152: return 0;
153:
154: done:
1.10 ratchov 155: par->msb = msb;
1.1 ratchov 156: par->sig = sig;
157: par->bits = bits;
158: par->bps = bps;
159: par->le = le;
160: return p - istr;
161: }
162:
163: /*
164: * Initialise parameters structure with the defaults natively supported
165: * by the machine.
166: */
167: void
168: aparams_init(struct aparams *par)
169: {
170: par->bps = sizeof(adata_t);
171: par->bits = ADATA_BITS;
172: par->le = ADATA_LE;
173: par->sig = 1;
174: par->msb = 0;
175: }
176:
177: /*
178: * log the given format/channels/encoding
179: */
180: void
181: aparams_log(struct aparams *par)
182: {
183: char enc[ENCMAX];
184:
185: aparams_enctostr(par, enc);
186: log_puts(enc);
187: }
188:
189: /*
190: * return true if encoding corresponds to what we store in adata_t
191: */
192: int
193: aparams_native(struct aparams *par)
194: {
195: return par->bps == sizeof(adata_t) && par->bits == ADATA_BITS &&
196: (par->bps == 1 || par->le == ADATA_LE) &&
197: (par->bits == par->bps * 8 || !par->msb);
198: }
199:
200: /*
201: * resample the given number of frames
202: */
1.13 ratchov 203: void
1.1 ratchov 204: resamp_do(struct resamp *p, adata_t *in, adata_t *out, int todo)
205: {
206: unsigned int nch;
207: adata_t *idata;
208: unsigned int oblksz;
209: int s, ds, diff;
210: adata_t *odata;
211: unsigned int iblksz;
212: unsigned int c;
213: adata_t *ctxbuf, *ctx;
214: unsigned int ctx_start;
215:
1.13 ratchov 216: #ifdef DEBUG
217: if (todo % p->iblksz != 0) {
218: log_puts("resamp_do: partial blocks not supported\n");
219: panic();
220: }
221: #endif
222:
1.1 ratchov 223: /*
224: * Partially copy structures into local variables, to avoid
225: * unnecessary indirections; this also allows the compiler to
226: * order local variables more "cache-friendly".
227: */
228: idata = in;
229: odata = out;
1.13 ratchov 230: diff = p->oblksz;
1.1 ratchov 231: iblksz = p->iblksz;
232: oblksz = p->oblksz;
233: ctxbuf = p->ctx;
234: ctx_start = p->ctx_start;
235: nch = p->nch;
236:
237: for (;;) {
1.13 ratchov 238: if (diff >= oblksz) {
239: if (todo == 0)
1.1 ratchov 240: break;
241: ctx_start ^= 1;
242: ctx = ctxbuf + ctx_start;
243: for (c = nch; c > 0; c--) {
244: *ctx = *idata++;
245: ctx += RESAMP_NCTX;
246: }
1.13 ratchov 247: diff -= oblksz;
248: todo--;
249: } else {
1.1 ratchov 250: ctx = ctxbuf;
251: for (c = nch; c > 0; c--) {
1.13 ratchov 252: s = ctx[ctx_start ^ 1];
253: ds = ctx[ctx_start] - s;
1.1 ratchov 254: ctx += RESAMP_NCTX;
255: *odata++ = s + ADATA_MULDIV(ds, diff, oblksz);
256: }
1.13 ratchov 257: diff += iblksz;
1.1 ratchov 258: }
259: }
1.13 ratchov 260:
1.1 ratchov 261: p->ctx_start = ctx_start;
262: }
263:
264: /*
265: * initialize resampler with ibufsz/obufsz factor and "nch" channels
266: */
267: void
1.9 ratchov 268: resamp_init(struct resamp *p, unsigned int iblksz,
269: unsigned int oblksz, int nch)
1.1 ratchov 270: {
271: p->iblksz = iblksz;
272: p->oblksz = oblksz;
273: p->nch = nch;
274: p->ctx_start = 0;
1.14 ! miko 275: memset(p->ctx, 0, sizeof(p->ctx));
1.1 ratchov 276: #ifdef DEBUG
277: if (log_level >= 3) {
278: log_puts("resamp: ");
279: log_putu(iblksz);
280: log_puts("/");
281: log_putu(oblksz);
282: log_puts("\n");
283: }
284: #endif
285: }
286:
287: /*
288: * encode "todo" frames from native to foreign encoding
289: */
290: void
291: enc_do(struct conv *p, unsigned char *in, unsigned char *out, int todo)
292: {
293: unsigned int f;
294: adata_t *idata;
1.8 ratchov 295: unsigned int s;
1.1 ratchov 296: unsigned int oshift;
1.8 ratchov 297: unsigned int obias;
1.1 ratchov 298: unsigned int obps;
299: unsigned int i;
300: unsigned char *odata;
301: int obnext;
302: int osnext;
303:
304: #ifdef DEBUG
305: if (log_level >= 4) {
306: log_puts("enc: copying ");
307: log_putu(todo);
308: log_puts(" frames\n");
309: }
310: #endif
311: /*
312: * Partially copy structures into local variables, to avoid
313: * unnecessary indirections; this also allows the compiler to
314: * order local variables more "cache-friendly".
315: */
316: idata = (adata_t *)in;
317: odata = out;
318: oshift = p->shift;
1.8 ratchov 319: obias = p->bias;
1.1 ratchov 320: obps = p->bps;
321: obnext = p->bnext;
322: osnext = p->snext;
323:
324: /*
325: * Start conversion.
326: */
327: odata += p->bfirst;
328: for (f = todo * p->nch; f > 0; f--) {
1.8 ratchov 329: /* convert adata to u32 */
330: s = (int)*idata++ + ADATA_UNIT;
1.1 ratchov 331: s <<= 32 - ADATA_BITS;
1.8 ratchov 332: /* convert u32 to uN */
1.1 ratchov 333: s >>= oshift;
1.8 ratchov 334: /* convert uN to sN */
335: s -= obias;
336: /* packetize sN */
1.1 ratchov 337: for (i = obps; i > 0; i--) {
338: *odata = (unsigned char)s;
339: s >>= 8;
340: odata += obnext;
341: }
342: odata += osnext;
343: }
344: }
345:
346: /*
347: * store "todo" frames of silence in foreign encoding
348: */
349: void
350: enc_sil_do(struct conv *p, unsigned char *out, int todo)
351: {
352: unsigned int f;
1.8 ratchov 353: unsigned int s;
354: unsigned int oshift;
355: int obias;
1.1 ratchov 356: unsigned int obps;
357: unsigned int i;
358: unsigned char *odata;
359: int obnext;
360: int osnext;
361:
362: #ifdef DEBUG
363: if (log_level >= 4) {
364: log_puts("enc: silence ");
365: log_putu(todo);
366: log_puts(" frames\n");
367: }
368: #endif
369: /*
370: * Partially copy structures into local variables, to avoid
371: * unnecessary indirections; this also allows the compiler to
372: * order local variables more "cache-friendly".
373: */
374: odata = out;
1.8 ratchov 375: oshift = p->shift;
376: obias = p->bias;
1.1 ratchov 377: obps = p->bps;
378: obnext = p->bnext;
379: osnext = p->snext;
380:
381: /*
382: * Start conversion.
383: */
384: odata += p->bfirst;
385: for (f = todo * p->nch; f > 0; f--) {
1.8 ratchov 386: s = ((1U << 31) >> oshift) - obias;
1.1 ratchov 387: for (i = obps; i > 0; i--) {
388: *odata = (unsigned char)s;
389: s >>= 8;
390: odata += obnext;
391: }
392: odata += osnext;
393: }
394: }
395:
396: /*
397: * initialize encoder from native to foreign encoding
398: */
399: void
400: enc_init(struct conv *p, struct aparams *par, int nch)
401: {
402: p->nch = nch;
403: p->bps = par->bps;
404: if (par->msb) {
405: p->shift = 32 - par->bps * 8;
406: } else {
407: p->shift = 32 - par->bits;
408: }
1.8 ratchov 409: if (par->sig) {
410: p->bias = (1U << 31) >> p->shift;
411: } else {
412: p->bias = 0;
1.9 ratchov 413: }
1.1 ratchov 414: if (!par->le) {
415: p->bfirst = par->bps - 1;
416: p->bnext = -1;
417: p->snext = 2 * par->bps;
418: } else {
419: p->bfirst = 0;
420: p->bnext = 1;
421: p->snext = 0;
422: }
423: #ifdef DEBUG
424: if (log_level >= 3) {
425: log_puts("enc: ");
426: aparams_log(par);
427: log_puts(", ");
428: log_puti(p->nch);
429: log_puts(" channels\n");
430: }
431: #endif
432: }
433:
434: /*
1.12 ratchov 435: * decode "todo" frames from foreign to native encoding
1.1 ratchov 436: */
437: void
438: dec_do(struct conv *p, unsigned char *in, unsigned char *out, int todo)
439: {
440: unsigned int f;
441: unsigned int ibps;
442: unsigned int i;
1.8 ratchov 443: unsigned int s = 0xdeadbeef;
1.1 ratchov 444: unsigned char *idata;
445: int ibnext;
446: int isnext;
1.8 ratchov 447: unsigned int ibias;
1.1 ratchov 448: unsigned int ishift;
449: adata_t *odata;
450:
451: #ifdef DEBUG
452: if (log_level >= 4) {
453: log_puts("dec: copying ");
454: log_putu(todo);
455: log_puts(" frames\n");
456: }
457: #endif
458: /*
459: * Partially copy structures into local variables, to avoid
460: * unnecessary indirections; this also allows the compiler to
461: * order local variables more "cache-friendly".
462: */
463: idata = in;
464: odata = (adata_t *)out;
465: ibps = p->bps;
466: ibnext = p->bnext;
1.8 ratchov 467: ibias = p->bias;
1.1 ratchov 468: ishift = p->shift;
469: isnext = p->snext;
470:
471: /*
472: * Start conversion.
473: */
474: idata += p->bfirst;
475: for (f = todo * p->nch; f > 0; f--) {
476: for (i = ibps; i > 0; i--) {
477: s <<= 8;
478: s |= *idata;
479: idata += ibnext;
480: }
481: idata += isnext;
1.8 ratchov 482: s += ibias;
1.1 ratchov 483: s <<= ishift;
484: s >>= 32 - ADATA_BITS;
1.8 ratchov 485: *odata++ = s - ADATA_UNIT;
1.1 ratchov 486: }
487: }
488:
489: /*
490: * initialize decoder from foreign to native encoding
491: */
492: void
493: dec_init(struct conv *p, struct aparams *par, int nch)
494: {
495: p->bps = par->bps;
496: p->nch = nch;
497: if (par->msb) {
498: p->shift = 32 - par->bps * 8;
499: } else {
500: p->shift = 32 - par->bits;
501: }
1.8 ratchov 502: if (par->sig) {
503: p->bias = (1U << 31) >> p->shift;
504: } else {
505: p->bias = 0;
1.9 ratchov 506: }
1.1 ratchov 507: if (par->le) {
508: p->bfirst = par->bps - 1;
509: p->bnext = -1;
510: p->snext = 2 * par->bps;
511: } else {
512: p->bfirst = 0;
513: p->bnext = 1;
514: p->snext = 0;
515: }
516: #ifdef DEBUG
517: if (log_level >= 3) {
518: log_puts("dec: ");
519: aparams_log(par);
520: log_puts(", ");
521: log_puti(p->nch);
522: log_puts(" channels\n");
523: }
524: #endif
525: }
526:
527: /*
528: * mix "todo" input frames on the output with the given volume
529: */
530: void
531: cmap_add(struct cmap *p, void *in, void *out, int vol, int todo)
532: {
533: adata_t *idata, *odata;
534: int i, j, nch, istart, inext, onext, ostart, y, v;
535:
536: #ifdef DEBUG
537: if (log_level >= 4) {
538: log_puts("cmap: adding ");
539: log_puti(todo);
540: log_puts(" frames\n");
541: }
542: #endif
543: idata = in;
544: odata = out;
545: ostart = p->ostart;
546: onext = p->onext;
547: istart = p->istart;
548: inext = p->inext;
549: nch = p->nch;
1.2 ratchov 550: v = vol;
1.1 ratchov 551:
552: /*
553: * map/mix input on the output
554: */
555: for (i = todo; i > 0; i--) {
556: odata += ostart;
557: idata += istart;
558: for (j = nch; j > 0; j--) {
559: y = *odata + ADATA_MUL(*idata, v);
560: if (y >= ADATA_UNIT)
561: y = ADATA_UNIT - 1;
562: else if (y < -ADATA_UNIT)
563: y = -ADATA_UNIT;
564: *odata = y;
565: idata++;
566: odata++;
567: }
568: odata += onext;
569: idata += inext;
570: }
571: }
572:
573: /*
1.12 ratchov 574: * overwrite output with "todo" input frames with the given volume
1.1 ratchov 575: */
576: void
577: cmap_copy(struct cmap *p, void *in, void *out, int vol, int todo)
578: {
579: adata_t *idata, *odata;
580: int i, j, nch, istart, inext, onext, ostart, v;
581:
582: #ifdef DEBUG
583: if (log_level >= 4) {
584: log_puts("cmap: copying ");
585: log_puti(todo);
586: log_puts(" frames\n");
587: }
588: #endif
589: idata = in;
590: odata = out;
591: ostart = p->ostart;
592: onext = p->onext;
593: istart = p->istart;
594: inext = p->inext;
595: nch = p->nch;
596: v = vol;
597:
598: /*
599: * copy to the output buffer
600: */
601: for (i = todo; i > 0; i--) {
602: idata += istart;
1.4 ratchov 603: odata += ostart;
1.1 ratchov 604: for (j = nch; j > 0; j--) {
605: *odata = ADATA_MUL(*idata, v);
606: odata++;
607: idata++;
608: }
1.4 ratchov 609: odata += onext;
1.1 ratchov 610: idata += inext;
611: }
612: }
613:
614: /*
615: * initialize channel mapper, to map a subset of input channel range
616: * into a subset of the output channel range
617: */
618: void
619: cmap_init(struct cmap *p,
620: int imin, int imax, int isubmin, int isubmax,
621: int omin, int omax, int osubmin, int osubmax)
622: {
623: int cmin, cmax;
624:
625: cmin = -NCHAN_MAX;
626: if (osubmin > cmin)
627: cmin = osubmin;
628: if (omin > cmin)
629: cmin = omin;
630: if (isubmin > cmin)
631: cmin = isubmin;
632: if (imin > cmin)
633: cmin = imin;
634:
635: cmax = NCHAN_MAX;
636: if (osubmax < cmax)
637: cmax = osubmax;
638: if (omax < cmax)
639: cmax = omax;
640: if (isubmax < cmax)
641: cmax = isubmax;
642: if (imax < cmax)
643: cmax = imax;
644:
645: p->ostart = cmin - omin;
646: p->onext = omax - cmax;
647: p->istart = cmin - imin;
648: p->inext = imax - cmax;
649: p->nch = cmax - cmin + 1;
650: #ifdef DEBUG
651: if (log_level >= 3) {
652: log_puts("cmap: nch = ");
653: log_puti(p->nch);
654: log_puts(", ostart = ");
655: log_puti(p->ostart);
656: log_puts(", onext = ");
657: log_puti(p->onext);
658: log_puts(", istart = ");
659: log_puti(p->istart);
1.6 ratchov 660: log_puts(", inext = ");
1.1 ratchov 661: log_puti(p->inext);
662: log_puts("\n");
663: }
664: #endif
665: }