mirror of https://github.com/ericonr/sndio.git
Use a 8-th order FIR low-pass filter for resampling
This commit is contained in:
Alexandre Ratchov
parent
40cdc42e22
commit
2996dcdc03
113
aucat/dsp.c
113
aucat/dsp.c
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@ -108,6 +108,75 @@ short dec_alawmap[256] = {
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944, 912, 1008, 976, 816, 784, 880, 848
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};
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int resamp_filt[RESAMP_LENGTH / RESAMP_STEP + 1] = {
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0, 0, 3, 9, 22, 42, 73, 116,
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174, 248, 341, 454, 589, 749, 934, 1148,
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1392, 1666, 1974, 2316, 2693, 3107, 3560, 4051,
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4582, 5154, 5766, 6420, 7116, 7853, 8632, 9451,
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10311, 11210, 12148, 13123, 14133, 15178, 16253, 17359,
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18491, 19647, 20824, 22018, 23226, 24443, 25665, 26888,
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28106, 29315, 30509, 31681, 32826, 33938, 35009, 36033,
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37001, 37908, 38744, 39502, 40174, 40750, 41223, 41582,
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41819, 41925, 41890, 41704, 41358, 40842, 40147, 39261,
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38176, 36881, 35366, 33623, 31641, 29411, 26923, 24169,
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21140, 17827, 14222, 10317, 6105, 1580, -3267, -8440,
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-13944, -19785, -25967, -32492, -39364, -46584, -54153, -62072,
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-70339, -78953, -87911, -97209, -106843, -116806, -127092, -137692,
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-148596, -159795, -171276, -183025, -195029, -207271, -219735, -232401,
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-245249, -258259, -271407, -284670, -298021, -311434, -324880, -338329,
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-351750, -365111, -378378, -391515, -404485, -417252, -429775, -442015,
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-453930, -465477, -476613, -487294, -497472, -507102, -516137, -524527,
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-532225, -539181, -545344, -550664, -555090, -558571, -561055, -562490,
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-562826, -562010, -559990, -556717, -552139, -546205, -538866, -530074,
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-519779, -507936, -494496, -479416, -462652, -444160, -423901, -401835,
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-377923, -352132, -324425, -294772, -263143, -229509, -193847, -156134,
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-116348, -74474, -30494, 15601, 63822, 114174, 166661, 221283,
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278037, 336916, 397911, 461009, 526194, 593446, 662741, 734054,
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807354, 882608, 959779, 1038826, 1119706, 1202370, 1286768, 1372846,
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1460546, 1549808, 1640566, 1732753, 1826299, 1921130, 2017169, 2114336,
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2212550, 2311723, 2411770, 2512598, 2614116, 2716228, 2818836, 2921841,
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3025142, 3128636, 3232218, 3335782, 3439219, 3542423, 3645282, 3747687,
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3849526, 3950687, 4051059, 4150530, 4248987, 4346320, 4442415, 4537163,
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4630453, 4722177, 4812225, 4900493, 4986873, 5071263, 5153561, 5233668,
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5311485, 5386917, 5459872, 5530259, 5597992, 5662986, 5725160, 5784436,
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5840739, 5893999, 5944148, 5991122, 6034862, 6075313, 6112422, 6146142,
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6176430, 6203247, 6226559, 6246335, 6262551, 6275185, 6284220, 6289647,
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6291456, 6289647, 6284220, 6275185, 6262551, 6246335, 6226559, 6203247,
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6176430, 6146142, 6112422, 6075313, 6034862, 5991122, 5944148, 5893999,
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5840739, 5784436, 5725160, 5662986, 5597992, 5530259, 5459872, 5386917,
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5311485, 5233668, 5153561, 5071263, 4986873, 4900493, 4812225, 4722177,
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4630453, 4537163, 4442415, 4346320, 4248987, 4150530, 4051059, 3950687,
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3849526, 3747687, 3645282, 3542423, 3439219, 3335782, 3232218, 3128636,
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3025142, 2921841, 2818836, 2716228, 2614116, 2512598, 2411770, 2311723,
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2212550, 2114336, 2017169, 1921130, 1826299, 1732753, 1640566, 1549808,
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1460546, 1372846, 1286768, 1202370, 1119706, 1038826, 959779, 882608,
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807354, 734054, 662741, 593446, 526194, 461009, 397911, 336916,
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278037, 221283, 166661, 114174, 63822, 15601, -30494, -74474,
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-116348, -156134, -193847, -229509, -263143, -294772, -324425, -352132,
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-377923, -401835, -423901, -444160, -462652, -479416, -494496, -507936,
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-519779, -530074, -538866, -546205, -552139, -556717, -559990, -562010,
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-562826, -562490, -561055, -558571, -555090, -550664, -545344, -539181,
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-532225, -524527, -516137, -507102, -497472, -487294, -476613, -465477,
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-453930, -442015, -429775, -417252, -404485, -391515, -378378, -365111,
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-351750, -338329, -324880, -311434, -298021, -284670, -271407, -258259,
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-245249, -232401, -219735, -207271, -195029, -183025, -171276, -159795,
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-148596, -137692, -127092, -116806, -106843, -97209, -87911, -78953,
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-70339, -62072, -54153, -46584, -39364, -32492, -25967, -19785,
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-13944, -8440, -3267, 1580, 6105, 10317, 14222, 17827,
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21140, 24169, 26923, 29411, 31641, 33623, 35366, 36881,
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38176, 39261, 40147, 40842, 41358, 41704, 41890, 41925,
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41819, 41582, 41223, 40750, 40174, 39502, 38744, 37908,
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37001, 36033, 35009, 33938, 32826, 31681, 30509, 29315,
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28106, 26888, 25665, 24443, 23226, 22018, 20824, 19647,
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18491, 17359, 16253, 15178, 14133, 13123, 12148, 11210,
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10311, 9451, 8632, 7853, 7116, 6420, 5766, 5154,
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4582, 4051, 3560, 3107, 2693, 2316, 1974, 1666,
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1392, 1148, 934, 749, 589, 454, 341, 248,
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174, 116, 73, 42, 22, 9, 3, 0,
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0
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};
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/*
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* Generate a string corresponding to the encoding in par,
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* return the length of the resulting string.
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@ -309,8 +378,10 @@ resamp_do(struct resamp *p, adata_t *in, adata_t *out, int icnt, int ocnt)
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unsigned int iblksz;
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unsigned int ofr;
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unsigned int c;
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int64_t f[NCHAN_MAX];
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adata_t *ctxbuf, *ctx;
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unsigned int ctx_start;
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int q, qi, qf, n;
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/*
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* Partially copy structures into local variables, to avoid
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@ -346,7 +417,7 @@ resamp_do(struct resamp *p, adata_t *in, adata_t *out, int icnt, int ocnt)
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if (diff >= oblksz) {
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if (ifr == 0)
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break;
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ctx_start ^= 1;
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ctx_start = (ctx_start - 1) & (RESAMP_NCTX - 1);
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ctx = ctxbuf + ctx_start;
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for (c = nch; c > 0; c--) {
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*ctx = *idata++;
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@ -357,13 +428,34 @@ resamp_do(struct resamp *p, adata_t *in, adata_t *out, int icnt, int ocnt)
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} else {
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if (ofr == 0)
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break;
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ctx = ctxbuf;
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for (c = nch; c > 0; c--) {
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s = ctx[ctx_start ^ 1];
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ds = ctx[ctx_start] - s;
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ctx += RESAMP_NCTX;
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*odata++ = s + ADATA_MULDIV(ds, diff, oblksz);
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for (c = nch; c > 0; c--)
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f[c] = 0;
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q = diff * p->filt_step;
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n = ctx_start;
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while (q < RESAMP_LENGTH) {
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qi = q >> RESAMP_STEP_BITS;
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qf = q & (RESAMP_STEP - 1);
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s = resamp_filt[qi];
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ds = resamp_filt[qi + 1] - s;
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s += (int64_t)qf * ds >> RESAMP_STEP_BITS;
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ctx = ctxbuf;
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for (c = nch; c > 0; c--) {
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f[c] += (int64_t)ctx[n] * s;
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ctx += RESAMP_NCTX;
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}
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q += p->filt_cutoff;
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n = (n + 1) & (RESAMP_NCTX - 1);
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}
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for (c = nch; c > 0; c--) {
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s = f[c] >> RESAMP_BITS;
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s = (int64_t)s * p->filt_cutoff >> RESAMP_BITS;
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*odata++ = s;
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}
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diff += iblksz;
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ofr--;
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}
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@ -429,6 +521,13 @@ resamp_init(struct resamp *p, unsigned int iblksz,
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p->nch = nch;
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p->ctx_start = 0;
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memset(p->ctx, 0, sizeof(p->ctx));
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if (p->iblksz < p->oblksz) {
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p->filt_cutoff = RESAMP_UNIT;
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p->filt_step = RESAMP_UNIT / p->oblksz;
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} else {
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p->filt_cutoff = (int64_t)RESAMP_UNIT * p->oblksz / p->iblksz;
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p->filt_step = RESAMP_UNIT / p->iblksz;
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}
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#ifdef DEBUG
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if (log_level >= 3) {
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log_puts("resamp: ");
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29
aucat/dsp.h
29
aucat/dsp.h
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@ -91,6 +91,32 @@ typedef int adata_t;
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#error "only 16-bit and 24-bit precisions are supported"
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#endif
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/*
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* The FIR is sampled and stored in a table of fixed-point numbers
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* with 23 fractional bits. For convenience, we use the same fixed-point
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* numbers to represent time and to walk through the table.
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*/
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#define RESAMP_BITS 23
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#define RESAMP_UNIT (1 << RESAMP_BITS)
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/*
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* Filter window length (the time unit is RESAMP_UNIT)
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*/
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#define RESAMP_LENGTH (8 * RESAMP_UNIT)
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/*
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* Time between samples of the FIR (the time unit is RESAMP_UNIT)
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*/
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#define RESAMP_STEP_BITS (RESAMP_BITS - 6)
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#define RESAMP_STEP (1 << RESAMP_STEP_BITS)
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/*
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* Maximum downsample/upsample ratio we support, must be a power of two.
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* The ratio between the max and the min sample rates is 192kHz / 4kHz = 48,
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* so we can use 64
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*/
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#define RESAMP_RATIO 64
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/*
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* Maximum size of the encording string (the longest possible
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* encoding is ``s24le3msb'').
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@ -111,9 +137,10 @@ struct aparams {
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};
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struct resamp {
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#define RESAMP_NCTX 2
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#define RESAMP_NCTX (RESAMP_LENGTH / RESAMP_UNIT * RESAMP_RATIO)
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unsigned int ctx_start;
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adata_t ctx[NCHAN_MAX * RESAMP_NCTX];
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int filt_cutoff, filt_step;
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unsigned int iblksz, oblksz;
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int diff;
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int nch;
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110
sndiod/dsp.c
110
sndiod/dsp.c
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@ -38,6 +38,75 @@ int aparams_ctltovol[128] = {
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26008, 27029, 28090, 29193, 30339, 31530, 32768
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};
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int resamp_filt[RESAMP_LENGTH / RESAMP_STEP + 1] = {
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0, 0, 3, 9, 22, 42, 73, 116,
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174, 248, 341, 454, 589, 749, 934, 1148,
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1392, 1666, 1974, 2316, 2693, 3107, 3560, 4051,
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4582, 5154, 5766, 6420, 7116, 7853, 8632, 9451,
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10311, 11210, 12148, 13123, 14133, 15178, 16253, 17359,
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18491, 19647, 20824, 22018, 23226, 24443, 25665, 26888,
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28106, 29315, 30509, 31681, 32826, 33938, 35009, 36033,
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37001, 37908, 38744, 39502, 40174, 40750, 41223, 41582,
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41819, 41925, 41890, 41704, 41358, 40842, 40147, 39261,
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38176, 36881, 35366, 33623, 31641, 29411, 26923, 24169,
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21140, 17827, 14222, 10317, 6105, 1580, -3267, -8440,
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-13944, -19785, -25967, -32492, -39364, -46584, -54153, -62072,
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-70339, -78953, -87911, -97209, -106843, -116806, -127092, -137692,
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-148596, -159795, -171276, -183025, -195029, -207271, -219735, -232401,
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-245249, -258259, -271407, -284670, -298021, -311434, -324880, -338329,
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-351750, -365111, -378378, -391515, -404485, -417252, -429775, -442015,
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-453930, -465477, -476613, -487294, -497472, -507102, -516137, -524527,
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-532225, -539181, -545344, -550664, -555090, -558571, -561055, -562490,
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-562826, -562010, -559990, -556717, -552139, -546205, -538866, -530074,
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-519779, -507936, -494496, -479416, -462652, -444160, -423901, -401835,
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-377923, -352132, -324425, -294772, -263143, -229509, -193847, -156134,
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-116348, -74474, -30494, 15601, 63822, 114174, 166661, 221283,
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278037, 336916, 397911, 461009, 526194, 593446, 662741, 734054,
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807354, 882608, 959779, 1038826, 1119706, 1202370, 1286768, 1372846,
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1460546, 1549808, 1640566, 1732753, 1826299, 1921130, 2017169, 2114336,
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2212550, 2311723, 2411770, 2512598, 2614116, 2716228, 2818836, 2921841,
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3025142, 3128636, 3232218, 3335782, 3439219, 3542423, 3645282, 3747687,
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3849526, 3950687, 4051059, 4150530, 4248987, 4346320, 4442415, 4537163,
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4630453, 4722177, 4812225, 4900493, 4986873, 5071263, 5153561, 5233668,
|
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5311485, 5386917, 5459872, 5530259, 5597992, 5662986, 5725160, 5784436,
|
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5840739, 5893999, 5944148, 5991122, 6034862, 6075313, 6112422, 6146142,
|
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6176430, 6203247, 6226559, 6246335, 6262551, 6275185, 6284220, 6289647,
|
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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,
|
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18491, 17359, 16253, 15178, 14133, 13123, 12148, 11210,
|
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10311, 9451, 8632, 7853, 7116, 6420, 5766, 5154,
|
||||
4582, 4051, 3560, 3107, 2693, 2316, 1974, 1666,
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1392, 1148, 934, 749, 589, 454, 341, 248,
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174, 116, 73, 42, 22, 9, 3, 0,
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0
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};
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/*
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* Generate a string corresponding to the encoding in par,
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* return the length of the resulting string.
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@ -212,8 +281,10 @@ resamp_do(struct resamp *p, adata_t *in, adata_t *out, int todo)
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adata_t *odata;
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unsigned int iblksz;
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unsigned int c;
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int64_t f[NCHAN_MAX];
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adata_t *ctxbuf, *ctx;
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unsigned int ctx_start;
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int q, qi, qf, n;
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#ifdef DEBUG
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if (todo % p->iblksz != 0) {
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@ -240,7 +311,7 @@ resamp_do(struct resamp *p, adata_t *in, adata_t *out, int todo)
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if (diff >= oblksz) {
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if (todo == 0)
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break;
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ctx_start ^= 1;
|
||||
ctx_start = (ctx_start - 1) & (RESAMP_NCTX - 1);
|
||||
ctx = ctxbuf + ctx_start;
|
||||
for (c = nch; c > 0; c--) {
|
||||
*ctx = *idata++;
|
||||
|
|
@ -249,12 +320,32 @@ resamp_do(struct resamp *p, adata_t *in, adata_t *out, int todo)
|
|||
diff -= oblksz;
|
||||
todo--;
|
||||
} else {
|
||||
ctx = ctxbuf;
|
||||
|
||||
for (c = nch; c > 0; 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 = nch; c > 0; c--) {
|
||||
f[c] += (int64_t)ctx[n] * s;
|
||||
ctx += RESAMP_NCTX;
|
||||
}
|
||||
q += p->filt_cutoff;
|
||||
n = (n + 1) & (RESAMP_NCTX - 1);
|
||||
}
|
||||
|
||||
for (c = nch; c > 0; c--) {
|
||||
s = ctx[ctx_start ^ 1];
|
||||
ds = ctx[ctx_start] - s;
|
||||
ctx += RESAMP_NCTX;
|
||||
*odata++ = s + ADATA_MULDIV(ds, diff, oblksz);
|
||||
s = f[c] >> RESAMP_BITS;
|
||||
s = (int64_t)s * p->filt_cutoff >> RESAMP_BITS;
|
||||
*odata++ = s;
|
||||
}
|
||||
diff += iblksz;
|
||||
}
|
||||
|
|
@ -275,6 +366,13 @@ resamp_init(struct resamp *p, unsigned int iblksz,
|
|||
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: ");
|
||||
|
|
|
|||
29
sndiod/dsp.h
29
sndiod/dsp.h
|
|
@ -91,6 +91,32 @@ typedef int adata_t;
|
|||
#error "only 16-bit and 24-bit precisions are supported"
|
||||
#endif
|
||||
|
||||
/*
|
||||
* The FIR is sampled and stored in a table of fixed-point numbers
|
||||
* with 23 fractional bits. For convenience, we use the same fixed-point
|
||||
* numbers to represent time and to walk through the table.
|
||||
*/
|
||||
#define RESAMP_BITS 23
|
||||
#define RESAMP_UNIT (1 << RESAMP_BITS)
|
||||
|
||||
/*
|
||||
* Filter window length (the time unit is RESAMP_UNIT)
|
||||
*/
|
||||
#define RESAMP_LENGTH (8 * RESAMP_UNIT)
|
||||
|
||||
/*
|
||||
* Time between samples of the FIR (the time unit is RESAMP_UNIT)
|
||||
*/
|
||||
#define RESAMP_STEP_BITS (RESAMP_BITS - 6)
|
||||
#define RESAMP_STEP (1 << RESAMP_STEP_BITS)
|
||||
|
||||
/*
|
||||
* Maximum downsample/upsample ratio we support, must be a power of two.
|
||||
* The ratio between the max and the min sample rates is 192kHz / 4kHz = 48,
|
||||
* so we can use 64
|
||||
*/
|
||||
#define RESAMP_RATIO 64
|
||||
|
||||
/*
|
||||
* Maximum size of the encording string (the longest possible
|
||||
* encoding is ``s24le3msb'').
|
||||
|
|
@ -111,9 +137,10 @@ struct aparams {
|
|||
};
|
||||
|
||||
struct resamp {
|
||||
#define RESAMP_NCTX 2
|
||||
#define RESAMP_NCTX (RESAMP_LENGTH / RESAMP_UNIT * RESAMP_RATIO)
|
||||
unsigned int ctx_start;
|
||||
adata_t ctx[NCHAN_MAX * RESAMP_NCTX];
|
||||
int filt_cutoff, filt_step;
|
||||
unsigned int iblksz, oblksz;
|
||||
int nch;
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in New Issue