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sndio/aucat/dsp.c

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/* $OpenBSD$ */
/*
* Copyright (c) 2008-2012 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <string.h>
#include "dsp.h"
#include "utils.h"
const int aparams_ctltovol[128] = {
0,
256, 266, 276, 287, 299, 310, 323, 335,
348, 362, 376, 391, 406, 422, 439, 456,
474, 493, 512, 532, 553, 575, 597, 621,
645, 670, 697, 724, 753, 782, 813, 845,
878, 912, 948, 985, 1024, 1064, 1106, 1149,
1195, 1241, 1290, 1341, 1393, 1448, 1505, 1564,
1625, 1689, 1756, 1825, 1896, 1971, 2048, 2128,
2212, 2299, 2389, 2483, 2580, 2682, 2787, 2896,
3010, 3128, 3251, 3379, 3511, 3649, 3792, 3941,
4096, 4257, 4424, 4598, 4778, 4966, 5161, 5363,
5574, 5793, 6020, 6256, 6502, 6757, 7023, 7298,
7585, 7883, 8192, 8514, 8848, 9195, 9556, 9931,
10321, 10726, 11148, 11585, 12040, 12513, 13004, 13515,
14045, 14596, 15170, 15765, 16384, 17027, 17696, 18390,
19112, 19863, 20643, 21453, 22295, 23170, 24080, 25025,
26008, 27029, 28090, 29193, 30339, 31530, 32768
};
const short dec_ulawmap[256] = {
-32124, -31100, -30076, -29052, -28028, -27004, -25980, -24956,
-23932, -22908, -21884, -20860, -19836, -18812, -17788, -16764,
-15996, -15484, -14972, -14460, -13948, -13436, -12924, -12412,
-11900, -11388, -10876, -10364, -9852, -9340, -8828, -8316,
-7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140,
-5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092,
-3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004,
-2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980,
-1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436,
-1372, -1308, -1244, -1180, -1116, -1052, -988, -924,
-876, -844, -812, -780, -748, -716, -684, -652,
-620, -588, -556, -524, -492, -460, -428, -396,
-372, -356, -340, -324, -308, -292, -276, -260,
-244, -228, -212, -196, -180, -164, -148, -132,
-120, -112, -104, -96, -88, -80, -72, -64,
-56, -48, -40, -32, -24, -16, -8, 0,
32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956,
23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764,
15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,
11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316,
7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140,
5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092,
3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004,
2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980,
1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436,
1372, 1308, 1244, 1180, 1116, 1052, 988, 924,
876, 844, 812, 780, 748, 716, 684, 652,
620, 588, 556, 524, 492, 460, 428, 396,
372, 356, 340, 324, 308, 292, 276, 260,
244, 228, 212, 196, 180, 164, 148, 132,
120, 112, 104, 96, 88, 80, 72, 64,
56, 48, 40, 32, 24, 16, 8, 0
};
const short dec_alawmap[256] = {
-5504, -5248, -6016, -5760, -4480, -4224, -4992, -4736,
-7552, -7296, -8064, -7808, -6528, -6272, -7040, -6784,
-2752, -2624, -3008, -2880, -2240, -2112, -2496, -2368,
-3776, -3648, -4032, -3904, -3264, -3136, -3520, -3392,
-22016, -20992, -24064, -23040, -17920, -16896, -19968, -18944,
-30208, -29184, -32256, -31232, -26112, -25088, -28160, -27136,
-11008, -10496, -12032, -11520, -8960, -8448, -9984, -9472,
-15104, -14592, -16128, -15616, -13056, -12544, -14080, -13568,
-344, -328, -376, -360, -280, -264, -312, -296,
-472, -456, -504, -488, -408, -392, -440, -424,
-88, -72, -120, -104, -24, -8, -56, -40,
-216, -200, -248, -232, -152, -136, -184, -168,
-1376, -1312, -1504, -1440, -1120, -1056, -1248, -1184,
-1888, -1824, -2016, -1952, -1632, -1568, -1760, -1696,
-688, -656, -752, -720, -560, -528, -624, -592,
-944, -912, -1008, -976, -816, -784, -880, -848,
5504, 5248, 6016, 5760, 4480, 4224, 4992, 4736,
7552, 7296, 8064, 7808, 6528, 6272, 7040, 6784,
2752, 2624, 3008, 2880, 2240, 2112, 2496, 2368,
3776, 3648, 4032, 3904, 3264, 3136, 3520, 3392,
22016, 20992, 24064, 23040, 17920, 16896, 19968, 18944,
30208, 29184, 32256, 31232, 26112, 25088, 28160, 27136,
11008, 10496, 12032, 11520, 8960, 8448, 9984, 9472,
15104, 14592, 16128, 15616, 13056, 12544, 14080, 13568,
344, 328, 376, 360, 280, 264, 312, 296,
472, 456, 504, 488, 408, 392, 440, 424,
88, 72, 120, 104, 24, 8, 56, 40,
216, 200, 248, 232, 152, 136, 184, 168,
1376, 1312, 1504, 1440, 1120, 1056, 1248, 1184,
1888, 1824, 2016, 1952, 1632, 1568, 1760, 1696,
688, 656, 752, 720, 560, 528, 624, 592,
944, 912, 1008, 976, 816, 784, 880, 848
};
const int resamp_filt[RESAMP_LENGTH / RESAMP_STEP + 1] = {
0, 0, 3, 9, 22, 42, 73, 116,
174, 248, 341, 454, 589, 749, 934, 1148,
1392, 1666, 1974, 2316, 2693, 3107, 3560, 4051,
4582, 5154, 5766, 6420, 7116, 7853, 8632, 9451,
10311, 11210, 12148, 13123, 14133, 15178, 16253, 17359,
18491, 19647, 20824, 22018, 23226, 24443, 25665, 26888,
28106, 29315, 30509, 31681, 32826, 33938, 35009, 36033,
37001, 37908, 38744, 39502, 40174, 40750, 41223, 41582,
41819, 41925, 41890, 41704, 41358, 40842, 40147, 39261,
38176, 36881, 35366, 33623, 31641, 29411, 26923, 24169,
21140, 17827, 14222, 10317, 6105, 1580, -3267, -8440,
-13944, -19785, -25967, -32492, -39364, -46584, -54153, -62072,
-70339, -78953, -87911, -97209, -106843, -116806, -127092, -137692,
-148596, -159795, -171276, -183025, -195029, -207271, -219735, -232401,
-245249, -258259, -271407, -284670, -298021, -311434, -324880, -338329,
-351750, -365111, -378378, -391515, -404485, -417252, -429775, -442015,
-453930, -465477, -476613, -487294, -497472, -507102, -516137, -524527,
-532225, -539181, -545344, -550664, -555090, -558571, -561055, -562490,
-562826, -562010, -559990, -556717, -552139, -546205, -538866, -530074,
-519779, -507936, -494496, -479416, -462652, -444160, -423901, -401835,
-377923, -352132, -324425, -294772, -263143, -229509, -193847, -156134,
-116348, -74474, -30494, 15601, 63822, 114174, 166661, 221283,
278037, 336916, 397911, 461009, 526194, 593446, 662741, 734054,
807354, 882608, 959779, 1038826, 1119706, 1202370, 1286768, 1372846,
1460546, 1549808, 1640566, 1732753, 1826299, 1921130, 2017169, 2114336,
2212550, 2311723, 2411770, 2512598, 2614116, 2716228, 2818836, 2921841,
3025142, 3128636, 3232218, 3335782, 3439219, 3542423, 3645282, 3747687,
3849526, 3950687, 4051059, 4150530, 4248987, 4346320, 4442415, 4537163,
4630453, 4722177, 4812225, 4900493, 4986873, 5071263, 5153561, 5233668,
5311485, 5386917, 5459872, 5530259, 5597992, 5662986, 5725160, 5784436,
5840739, 5893999, 5944148, 5991122, 6034862, 6075313, 6112422, 6146142,
6176430, 6203247, 6226559, 6246335, 6262551, 6275185, 6284220, 6289647,
6291456, 6289647, 6284220, 6275185, 6262551, 6246335, 6226559, 6203247,
6176430, 6146142, 6112422, 6075313, 6034862, 5991122, 5944148, 5893999,
5840739, 5784436, 5725160, 5662986, 5597992, 5530259, 5459872, 5386917,
5311485, 5233668, 5153561, 5071263, 4986873, 4900493, 4812225, 4722177,
4630453, 4537163, 4442415, 4346320, 4248987, 4150530, 4051059, 3950687,
3849526, 3747687, 3645282, 3542423, 3439219, 3335782, 3232218, 3128636,
3025142, 2921841, 2818836, 2716228, 2614116, 2512598, 2411770, 2311723,
2212550, 2114336, 2017169, 1921130, 1826299, 1732753, 1640566, 1549808,
1460546, 1372846, 1286768, 1202370, 1119706, 1038826, 959779, 882608,
807354, 734054, 662741, 593446, 526194, 461009, 397911, 336916,
278037, 221283, 166661, 114174, 63822, 15601, -30494, -74474,
-116348, -156134, -193847, -229509, -263143, -294772, -324425, -352132,
-377923, -401835, -423901, -444160, -462652, -479416, -494496, -507936,
-519779, -530074, -538866, -546205, -552139, -556717, -559990, -562010,
-562826, -562490, -561055, -558571, -555090, -550664, -545344, -539181,
-532225, -524527, -516137, -507102, -497472, -487294, -476613, -465477,
-453930, -442015, -429775, -417252, -404485, -391515, -378378, -365111,
-351750, -338329, -324880, -311434, -298021, -284670, -271407, -258259,
-245249, -232401, -219735, -207271, -195029, -183025, -171276, -159795,
-148596, -137692, -127092, -116806, -106843, -97209, -87911, -78953,
-70339, -62072, -54153, -46584, -39364, -32492, -25967, -19785,
-13944, -8440, -3267, 1580, 6105, 10317, 14222, 17827,
21140, 24169, 26923, 29411, 31641, 33623, 35366, 36881,
38176, 39261, 40147, 40842, 41358, 41704, 41890, 41925,
41819, 41582, 41223, 40750, 40174, 39502, 38744, 37908,
37001, 36033, 35009, 33938, 32826, 31681, 30509, 29315,
28106, 26888, 25665, 24443, 23226, 22018, 20824, 19647,
18491, 17359, 16253, 15178, 14133, 13123, 12148, 11210,
10311, 9451, 8632, 7853, 7116, 6420, 5766, 5154,
4582, 4051, 3560, 3107, 2693, 2316, 1974, 1666,
1392, 1148, 934, 749, 589, 454, 341, 248,
174, 116, 73, 42, 22, 9, 3, 0,
0
};
/*
* Generate a string corresponding to the encoding in par,
* return the length of the resulting string.
*/
int
aparams_enctostr(struct aparams *par, char *ostr)
{
char *p = ostr;
*p++ = par->sig ? 's' : 'u';
if (par->bits > 9)
*p++ = '0' + par->bits / 10;
*p++ = '0' + par->bits % 10;
if (par->bps > 1) {
*p++ = par->le ? 'l' : 'b';
*p++ = 'e';
if (par->bps != APARAMS_BPS(par->bits) ||
par->bits < par->bps * 8) {
*p++ = par->bps + '0';
if (par->bits < par->bps * 8) {
*p++ = par->msb ? 'm' : 'l';
*p++ = 's';
*p++ = 'b';
}
}
}
*p++ = '\0';
return p - ostr - 1;
}
/*
* Parse an encoding string, examples: s8, u8, s16, s16le, s24be ...
* set *istr to the char following the encoding. Return the number
* of bytes consumed.
*/
int
aparams_strtoenc(struct aparams *par, char *istr)
{
char *p = istr;
int i, sig, bits, le, bps, msb;
#define IS_SEP(c) \
(((c) < 'a' || (c) > 'z') && \
((c) < 'A' || (c) > 'Z') && \
((c) < '0' || (c) > '9'))
/*
* get signedness
*/
if (*p == 's') {
sig = 1;
} else if (*p == 'u') {
sig = 0;
} else
return 0;
p++;
/*
* get number of bits per sample
*/
bits = 0;
for (i = 0; i < 2; i++) {
if (*p < '0' || *p > '9')
break;
bits = (bits * 10) + *p - '0';
p++;
}
if (bits < BITS_MIN || bits > BITS_MAX)
return 0;
bps = APARAMS_BPS(bits);
msb = 1;
le = ADATA_LE;
/*
* get (optional) endianness
*/
if (p[0] == 'l' && p[1] == 'e') {
le = 1;
p += 2;
} else if (p[0] == 'b' && p[1] == 'e') {
le = 0;
p += 2;
} else if (IS_SEP(*p)) {
goto done;
} else
return 0;
/*
* get (optional) number of bytes
*/
if (*p >= '0' && *p <= '9') {
bps = *p - '0';
if (bps < (bits + 7) / 8 ||
bps > (BITS_MAX + 7) / 8)
return 0;
p++;
/*
* get (optional) alignment
*/
if (p[0] == 'm' && p[1] == 's' && p[2] == 'b') {
msb = 1;
p += 3;
} else if (p[0] == 'l' && p[1] == 's' && p[2] == 'b') {
msb = 0;
p += 3;
} else if (IS_SEP(*p)) {
goto done;
} else
return 0;
} else if (!IS_SEP(*p))
return 0;
done:
par->msb = msb;
par->sig = sig;
par->bits = bits;
par->bps = bps;
par->le = le;
return p - istr;
}
/*
* Initialise parameters structure with the defaults natively supported
* by the machine.
*/
void
aparams_init(struct aparams *par)
{
par->bps = sizeof(adata_t);
par->bits = ADATA_BITS;
par->le = ADATA_LE;
par->sig = 1;
par->msb = 0;
}
/*
* log the given format/channels/encoding
*/
void
aparams_log(struct aparams *par)
{
char enc[ENCMAX];
aparams_enctostr(par, enc);
log_puts(enc);
}
/*
* return true if encoding corresponds to what we store in adata_t
*/
int
aparams_native(struct aparams *par)
{
return par->sig &&
par->bps == sizeof(adata_t) &&
par->bits == ADATA_BITS &&
(par->bps == 1 || par->le == ADATA_LE) &&
(par->bits == par->bps * 8 || !par->msb);
}
/*
* Return the number of input and output frame that would be consumed
* by resamp_do(p, *icnt, *ocnt).
*/
void
resamp_getcnt(struct resamp *p, int *icnt, int *ocnt)
{
long long idiff, odiff;
int cdiff;
cdiff = p->oblksz - p->diff;
idiff = (long long)*icnt * p->oblksz;
odiff = (long long)*ocnt * p->iblksz;
if (odiff - idiff >= cdiff)
*ocnt = (idiff + cdiff + p->iblksz - 1) / p->iblksz;
else
*icnt = (odiff + p->diff) / p->oblksz;
}
/*
* Resample the given number of frames. The number of output frames
* must match the coresponding number of input frames. Either always
* use icnt and ocnt such that:
*
* icnt * oblksz = ocnt * iblksz
*
* or use resamp_getcnt() to calculate the proper numbers.
*/
void
resamp_do(struct resamp *p, adata_t *in, adata_t *out, int icnt, int ocnt)
{
unsigned int nch;
adata_t *idata;
unsigned int oblksz;
unsigned int ifr;
int s, ds, diff;
adata_t *odata;
unsigned int iblksz;
unsigned int ofr;
unsigned int c;
int64_t f[NCHAN_MAX];
adata_t *ctxbuf, *ctx;
unsigned int ctx_start;
int q, qi, qf, n;
/*
* Partially copy structures into local variables, to avoid
* unnecessary indirections; this also allows the compiler to
* order local variables more "cache-friendly".
*/
idata = in;
odata = out;
diff = p->diff;
iblksz = p->iblksz;
oblksz = p->oblksz;
ctxbuf = p->ctx;
ctx_start = p->ctx_start;
nch = p->nch;
ifr = icnt;
ofr = ocnt;
/*
* Start conversion.
*/
#ifdef DEBUG
if (log_level >= 4) {
log_puts("resamp: copying ");
log_puti(ifr);
log_puts(" -> ");
log_putu(ofr);
log_puts(" frames, diff = ");
log_puti(diff);
log_puts("\n");
}
#endif
for (;;) {
if (diff >= oblksz) {
if (ifr == 0)
break;
ctx_start = (ctx_start - 1) & (RESAMP_NCTX - 1);
ctx = ctxbuf + ctx_start;
for (c = nch; c > 0; c--) {
*ctx = *idata++;
ctx += RESAMP_NCTX;
}
diff -= oblksz;
ifr--;
} else {
if (ofr == 0)
break;
for (c = 0; c < nch; c++)
f[c] = 0;
q = diff * p->filt_step;
n = ctx_start;
while (q < RESAMP_LENGTH) {
qi = q >> RESAMP_STEP_BITS;
qf = q & (RESAMP_STEP - 1);
s = resamp_filt[qi];
ds = resamp_filt[qi + 1] - s;
s += (int64_t)qf * ds >> RESAMP_STEP_BITS;
ctx = ctxbuf;
for (c = 0; c < nch; c++) {
f[c] += (int64_t)ctx[n] * s;
ctx += RESAMP_NCTX;
}
q += p->filt_cutoff;
n = (n + 1) & (RESAMP_NCTX - 1);
}
for (c = 0; c < nch; c++) {
s = f[c] >> RESAMP_BITS;
s = (int64_t)s * p->filt_cutoff >> RESAMP_BITS;
#if ADATA_BITS == 16
/*
* In 16-bit mode, we've no room for filter
* overshoots, so we need to clip the signal
* to avoid 16-bit integers to wrap around.
* In 24-bit mode, samples may exceed the
* [-1:1] range. Later, cmap_add() will clip
* them, so no need to clip them here as well.
*/
if (s >= ADATA_UNIT)
s = ADATA_UNIT - 1;
else if (s < -ADATA_UNIT)
s = -ADATA_UNIT;
#endif
*odata++ = s;
}
diff += iblksz;
ofr--;
}
}
p->diff = diff;
p->ctx_start = ctx_start;
#ifdef DEBUG
if (ifr != 0) {
log_puts("resamp_do: ");
log_puti(ifr);
log_puts(": too many input frames\n");
panic();
}
if (ofr != 0) {
log_puts("resamp_do: ");
log_puti(ofr);
log_puts(": too many output frames\n");
panic();
}
#endif
}
static unsigned int
uint_gcd(unsigned int a, unsigned int b)
{
unsigned int r;
while (b > 0) {
r = a % b;
a = b;
b = r;
}
return a;
}
/*
* initialize resampler with ibufsz/obufsz factor and "nch" channels
*/
void
resamp_init(struct resamp *p, unsigned int iblksz,
unsigned int oblksz, int nch)
{
unsigned int g;
/*
* reduce iblksz/oblksz fraction
*/
g = uint_gcd(iblksz, oblksz);
iblksz /= g;
oblksz /= g;
/*
* ensure weird rates don't cause integer overflow
*/
while (iblksz > ADATA_UNIT || oblksz > ADATA_UNIT) {
iblksz >>= 1;
oblksz >>= 1;
}
p->iblksz = iblksz;
p->oblksz = oblksz;
p->diff = 0;
p->nch = nch;
p->ctx_start = 0;
memset(p->ctx, 0, sizeof(p->ctx));
if (p->iblksz < p->oblksz) {
p->filt_cutoff = RESAMP_UNIT;
p->filt_step = RESAMP_UNIT / p->oblksz;
} else {
p->filt_cutoff = (int64_t)RESAMP_UNIT * p->oblksz / p->iblksz;
p->filt_step = RESAMP_UNIT / p->iblksz;
}
#ifdef DEBUG
if (log_level >= 3) {
log_puts("resamp: ");
log_putu(iblksz);
log_puts("/");
log_putu(oblksz);
log_puts("\n");
}
#endif
}
/*
* encode "todo" frames from native to foreign encoding
*/
void
enc_do(struct conv *p, unsigned char *in, unsigned char *out, int todo)
{
unsigned int f;
adata_t *idata;
unsigned int s;
unsigned int oshift;
unsigned int obias;
unsigned int obps;
unsigned int i;
unsigned char *odata;
int obnext;
int osnext;
#ifdef DEBUG
if (log_level >= 4) {
log_puts("enc: copying ");
log_putu(todo);
log_puts(" frames\n");
}
#endif
/*
* Partially copy structures into local variables, to avoid
* unnecessary indirections; this also allows the compiler to
* order local variables more "cache-friendly".
*/
idata = (adata_t *)in;
odata = out;
oshift = p->shift;
obias = p->bias;
obps = p->bps;
obnext = p->bnext;
osnext = p->snext;
/*
* Start conversion.
*/
odata += p->bfirst;
for (f = todo * p->nch; f > 0; f--) {
/* convert adata to u32 */
s = (int)*idata++ + ADATA_UNIT;
s <<= 32 - ADATA_BITS;
/* convert u32 to uN */
s >>= oshift;
/* convert uN to sN */
s -= obias;
/* packetize sN */
for (i = obps; i > 0; i--) {
*odata = (unsigned char)s;
s >>= 8;
odata += obnext;
}
odata += osnext;
}
}
/*
* store "todo" frames of silence in foreign encoding
*/
void
enc_sil_do(struct conv *p, unsigned char *out, int todo)
{
unsigned int f;
unsigned int s;
unsigned int oshift;
int obias;
unsigned int obps;
unsigned int i;
unsigned char *odata;
int obnext;
int osnext;
#ifdef DEBUG
if (log_level >= 4) {
log_puts("enc: silence ");
log_putu(todo);
log_puts(" frames\n");
}
#endif
/*
* Partially copy structures into local variables, to avoid
* unnecessary indirections; this also allows the compiler to
* order local variables more "cache-friendly".
*/
odata = out;
oshift = p->shift;
obias = p->bias;
obps = p->bps;
obnext = p->bnext;
osnext = p->snext;
/*
* Start conversion.
*/
odata += p->bfirst;
for (f = todo * p->nch; f > 0; f--) {
s = ((1U << 31) >> oshift) - obias;
for (i = obps; i > 0; i--) {
*odata = (unsigned char)s;
s >>= 8;
odata += obnext;
}
odata += osnext;
}
}
/*
* initialize encoder from native to foreign encoding
*/
void
enc_init(struct conv *p, struct aparams *par, int nch)
{
p->nch = nch;
p->bps = par->bps;
if (par->msb) {
p->shift = 32 - par->bps * 8;
} else {
p->shift = 32 - par->bits;
}
if (par->sig) {
p->bias = (1U << 31) >> p->shift;
} else {
p->bias = 0;
}
if (!par->le) {
p->bfirst = par->bps - 1;
p->bnext = -1;
p->snext = 2 * par->bps;
} else {
p->bfirst = 0;
p->bnext = 1;
p->snext = 0;
}
#ifdef DEBUG
if (log_level >= 3) {
log_puts("enc: ");
aparams_log(par);
log_puts(", ");
log_puti(p->nch);
log_puts(" channels\n");
}
#endif
}
/*
* decode "todo" frames from foreign to native encoding
*/
void
dec_do(struct conv *p, unsigned char *in, unsigned char *out, int todo)
{
unsigned int f;
unsigned int ibps;
unsigned int i;
unsigned int s = 0xdeadbeef;
unsigned char *idata;
int ibnext;
int isnext;
unsigned int ibias;
unsigned int ishift;
adata_t *odata;
#ifdef DEBUG
if (log_level >= 4) {
log_puts("dec: copying ");
log_putu(todo);
log_puts(" frames\n");
}
#endif
/*
* Partially copy structures into local variables, to avoid
* unnecessary indirections; this also allows the compiler to
* order local variables more "cache-friendly".
*/
idata = in;
odata = (adata_t *)out;
ibps = p->bps;
ibnext = p->bnext;
ibias = p->bias;
ishift = p->shift;
isnext = p->snext;
/*
* Start conversion.
*/
idata += p->bfirst;
for (f = todo * p->nch; f > 0; f--) {
for (i = ibps; i > 0; i--) {
s <<= 8;
s |= *idata;
idata += ibnext;
}
idata += isnext;
s += ibias;
s <<= ishift;
s >>= 32 - ADATA_BITS;
*odata++ = s - ADATA_UNIT;
}
}
/*
* convert a 32-bit float to adata_t, clipping to -1:1, boundaries
* excluded
*/
static inline int
f32_to_adata(unsigned int x)
{
unsigned int s, e, m, y;
s = (x >> 31);
e = (x >> 23) & 0xff;
m = (x << 8) | 0x80000000;
/*
* f32 exponent is (e - 127) and the point is after the 31-th
* bit, thus the shift is:
*
* 31 - (BITS - 1) - (e - 127)
*
* to ensure output is in the 0..(2^BITS)-1 range, the minimum
* shift is 31 - (BITS - 1) + 1, and maximum shift is 31
*/
if (e < 127 - (ADATA_BITS - 1))
y = 0;
else if (e >= 127)
y = ADATA_UNIT - 1;
else
y = m >> (127 + (32 - ADATA_BITS) - e);
return (y ^ -s) + s;
}
/*
* convert samples from little endian ieee 754 floats to adata_t
*/
void
dec_do_float(struct conv *p, unsigned char *in, unsigned char *out, int todo)
{
unsigned int f;
unsigned int i;
unsigned int s = 0xdeadbeef;
unsigned char *idata;
int ibnext;
int isnext;
adata_t *odata;
#ifdef DEBUG
if (log_level >= 4) {
log_puts("dec_float: copying ");
log_putu(todo);
log_puts(" frames\n");
}
#endif
/*
* Partially copy structures into local variables, to avoid
* unnecessary indirections; this also allows the compiler to
* order local variables more "cache-friendly".
*/
idata = in;
odata = (adata_t *)out;
ibnext = p->bnext;
isnext = p->snext;
/*
* Start conversion.
*/
idata += p->bfirst;
for (f = todo * p->nch; f > 0; f--) {
for (i = 4; i > 0; i--) {
s <<= 8;
s |= *idata;
idata += ibnext;
}
idata += isnext;
*odata++ = f32_to_adata(s);
}
}
/*
* convert samples from ulaw/alaw to adata_t
*/
void
dec_do_ulaw(struct conv *p, unsigned char *in,
unsigned char *out, int todo, int is_alaw)
{
unsigned int f;
unsigned char *idata;
adata_t *odata;
const short *map;
#ifdef DEBUG
if (log_level >= 4) {
log_puts("dec_ulaw: copying ");
log_putu(todo);
log_puts(" frames\n");
}
#endif
map = is_alaw ? dec_alawmap : dec_ulawmap;
idata = in;
odata = (adata_t *)out;
for (f = todo * p->nch; f > 0; f--)
*odata++ = map[*idata++] << (ADATA_BITS - 16);
}
/*
* initialize decoder from foreign to native encoding
*/
void
dec_init(struct conv *p, struct aparams *par, int nch)
{
p->bps = par->bps;
p->nch = nch;
if (par->msb) {
p->shift = 32 - par->bps * 8;
} else {
p->shift = 32 - par->bits;
}
if (par->sig) {
p->bias = (1U << 31) >> p->shift;
} else {
p->bias = 0;
}
if (par->le) {
p->bfirst = par->bps - 1;
p->bnext = -1;
p->snext = 2 * par->bps;
} else {
p->bfirst = 0;
p->bnext = 1;
p->snext = 0;
}
#ifdef DEBUG
if (log_level >= 3) {
log_puts("dec: ");
aparams_log(par);
log_puts(", ");
log_puti(p->nch);
log_puts(" channels\n");
}
#endif
}
/*
* mix "todo" input frames on the output with the given volume
*/
void
cmap_add(struct cmap *p, void *in, void *out, int vol, int todo)
{
adata_t *idata, *odata;
int i, j, nch, istart, inext, onext, ostart, y, v;
#ifdef DEBUG
if (log_level >= 4) {
log_puts("cmap: adding ");
log_puti(todo);
log_puts(" frames\n");
}
#endif
idata = in;
odata = out;
ostart = p->ostart;
onext = p->onext;
istart = p->istart;
inext = p->inext;
nch = p->nch;
v = vol;
/*
* map/mix input on the output
*/
for (i = todo; i > 0; i--) {
odata += ostart;
idata += istart;
for (j = nch; j > 0; j--) {
y = *odata + ADATA_MUL(*idata, v);
if (y >= ADATA_UNIT)
y = ADATA_UNIT - 1;
else if (y < -ADATA_UNIT)
y = -ADATA_UNIT;
*odata = y;
idata++;
odata++;
}
odata += onext;
idata += inext;
}
}
/*
* overwrite output with "todo" input frames with the given volume
*/
void
cmap_copy(struct cmap *p, void *in, void *out, int vol, int todo)
{
adata_t *idata, *odata;
int i, j, nch, istart, inext, onext, ostart, v;
#ifdef DEBUG
if (log_level >= 4) {
log_puts("cmap: copying ");
log_puti(todo);
log_puts(" frames\n");
}
#endif
idata = in;
odata = out;
ostart = p->ostart;
onext = p->onext;
istart = p->istart;
inext = p->inext;
nch = p->nch;
v = vol;
/*
* copy to the output buffer
*/
for (i = todo; i > 0; i--) {
idata += istart;
odata += ostart;
for (j = nch; j > 0; j--) {
*odata = ADATA_MUL(*idata, v);
odata++;
idata++;
}
odata += onext;
idata += inext;
}
}
/*
* initialize channel mapper, to map a subset of input channel range
* into a subset of the output channel range
*/
void
cmap_init(struct cmap *p,
int imin, int imax, int isubmin, int isubmax,
int omin, int omax, int osubmin, int osubmax)
{
int cmin, cmax;
cmin = -NCHAN_MAX;
if (osubmin > cmin)
cmin = osubmin;
if (omin > cmin)
cmin = omin;
if (isubmin > cmin)
cmin = isubmin;
if (imin > cmin)
cmin = imin;
cmax = NCHAN_MAX;
if (osubmax < cmax)
cmax = osubmax;
if (omax < cmax)
cmax = omax;
if (isubmax < cmax)
cmax = isubmax;
if (imax < cmax)
cmax = imax;
p->ostart = cmin - omin;
p->onext = omax - cmax;
p->istart = cmin - imin;
p->inext = imax - cmax;
p->nch = cmax - cmin + 1;
#ifdef DEBUG
if (log_level >= 3) {
log_puts("cmap: nch = ");
log_puti(p->nch);
log_puts(", ostart = ");
log_puti(p->ostart);
log_puts(", onext = ");
log_puti(p->onext);
log_puts(", istart = ");
log_puti(p->istart);
log_puts(", inext = ");
log_puti(p->inext);
log_puts("\n");
}
#endif
}
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