140 lines
4.4 KiB
C
140 lines
4.4 KiB
C
/* SoX Resampler Library Copyright (c) 2007-16 robs@users.sourceforge.net
|
|
* Licence for this file: LGPL v2.1 See LICENCE for details. */
|
|
|
|
/* Resample using an interpolated poly-phase FIR with length LEN. */
|
|
/* Input must be followed by FIR_LENGTH-1 samples. */
|
|
|
|
#if COEF_INTERP != 1 && COEF_INTERP != 2 && COEF_INTERP != 3
|
|
#error COEF_INTERP
|
|
#endif
|
|
|
|
#if SIMD_AVX || SIMD_SSE || SIMD_NEON
|
|
#define N (FIR_LENGTH>>2)
|
|
|
|
#if COEF_INTERP == 1
|
|
#define _ sum=vMac(vMac(b,X,a),vLdu(in+j*4),sum), ++j;
|
|
#elif COEF_INTERP == 2
|
|
#define _ sum=vMac(vMac(vMac(c,X,b),X,a),vLdu(in+j*4),sum), ++j;
|
|
#else
|
|
#define _ sum=vMac(vMac(vMac(vMac(d,X,c),X,b),X,a),vLdu(in+j*4),sum), ++j;
|
|
#endif
|
|
|
|
#define a coefs[(COEF_INTERP+1)*(N*phase+j)+(COEF_INTERP-0)]
|
|
#define b coefs[(COEF_INTERP+1)*(N*phase+j)+(COEF_INTERP-1)]
|
|
#define c coefs[(COEF_INTERP+1)*(N*phase+j)+(COEF_INTERP-2)]
|
|
#define d coefs[(COEF_INTERP+1)*(N*phase+j)+(COEF_INTERP-3)]
|
|
|
|
#define BEGINNING v4_t X = vLds(x), sum = vZero(); \
|
|
v4_t const * const __restrict coefs = (v4_t *)COEFS
|
|
#define MIDDLE switch (N) {case 3: CONVOLVE(3); break; case 4: CONVOLVE(4); \
|
|
break; case 5: CONVOLVE(5); break; default: CONVOLVE(N); }
|
|
#define END vStorSum(output+i, sum)
|
|
#define cc(n) case n: core(n); break
|
|
#define CORE(n) switch (n) {cc(2); cc(3); cc(4); cc(5); cc(6); default: core(n);}
|
|
#else
|
|
#define N FIR_LENGTH
|
|
|
|
#if COEF_INTERP == 1
|
|
#define _ sum += (b*x + a)*in[j], ++j;
|
|
#elif COEF_INTERP == 2
|
|
#define _ sum += ((c*x + b)*x + a)*in[j], ++j;
|
|
#else
|
|
#define _ sum += (((d*x + c)*x + b)*x + a)*in[j], ++j;
|
|
#endif
|
|
|
|
#define a (coef(COEFS, COEF_INTERP, N, phase, 0,j))
|
|
#define b (coef(COEFS, COEF_INTERP, N, phase, 1,j))
|
|
#define c (coef(COEFS, COEF_INTERP, N, phase, 2,j))
|
|
#define d (coef(COEFS, COEF_INTERP, N, phase, 3,j))
|
|
|
|
#define BEGINNING sample_t sum = 0
|
|
#define MIDDLE CONVOLVE(N)
|
|
#define END output[i] = sum
|
|
#define CORE(n) core(n)
|
|
#endif
|
|
|
|
#define fphpCore(n) \
|
|
if (p->use_hi_prec_clock) { \
|
|
float_step_t at = p->at.flt; \
|
|
for (i = 0; (int)at < num_in; ++i, at += p->step.flt) { \
|
|
sample_t const * const __restrict in = input + (int)at; \
|
|
float_step_t frac = at - (int)at; \
|
|
int phase = (int)(frac * (1 << PHASE_BITS)); \
|
|
sample_t x = (sample_t)(frac * (1 << PHASE_BITS) - phase); \
|
|
int j = 0; \
|
|
BEGINNING; CONVOLVE(n); END; \
|
|
} \
|
|
fifo_read(&p->fifo, (int)at, NULL); \
|
|
p->at.flt = at - (int)at; \
|
|
} else
|
|
|
|
#define hpCore(n) \
|
|
if (p->use_hi_prec_clock) { \
|
|
for (i = 0; p->at.integer < num_in; ++i, \
|
|
p->at.fix.ls.all += p->step.fix.ls.all, \
|
|
p->at.whole += p->step.whole + (p->at.fix.ls.all < p->step.fix.ls.all)) { \
|
|
sample_t const * const __restrict in = input + p->at.integer; \
|
|
uint32_t frac = p->at.fraction; \
|
|
int phase = (int)(frac >> (32 - PHASE_BITS)); /* high-order bits */ \
|
|
sample_t x = (sample_t)((frac << PHASE_BITS) * (1 / MULT32)); /* low-order bits, scaled to [0,1) */ \
|
|
int j = 0; \
|
|
BEGINNING; CONVOLVE(n); END; \
|
|
} \
|
|
fifo_read(&p->fifo, p->at.integer, NULL); \
|
|
p->at.integer = 0; \
|
|
} else
|
|
|
|
#define spCore(n) { \
|
|
for (i = 0; p->at.integer < num_in; ++i, p->at.whole += p->step.whole) { \
|
|
sample_t const * const __restrict in = input + p->at.integer; \
|
|
uint32_t frac = p->at.fraction; \
|
|
int phase = (int)(frac >> (32 - PHASE_BITS)); /* high-order bits */ \
|
|
sample_t x = (sample_t)((frac << PHASE_BITS) * (1 / MULT32)); /* low-order bits, scaled to [0,1) */ \
|
|
int j = 0; \
|
|
BEGINNING; CONVOLVE(n); END; \
|
|
} \
|
|
fifo_read(&p->fifo, p->at.integer, NULL); \
|
|
p->at.integer = 0; }
|
|
|
|
#if defined HI_PREC_CLOCK && FLOAT_HI_PREC_CLOCK
|
|
#define core(n) fphpCore(n) spCore(n)
|
|
#elif defined HI_PREC_CLOCK
|
|
#define core(n) hpCore(n) spCore(n)
|
|
#else
|
|
#define core(n) spCore(n)
|
|
#endif
|
|
|
|
|
|
|
|
static void FUNCTION(stage_t * p, fifo_t * output_fifo)
|
|
{
|
|
sample_t const * input = stage_read_p(p);
|
|
int num_in = min(stage_occupancy(p), p->input_size);
|
|
int i, max_num_out = 1 + (int)(num_in * p->out_in_ratio);
|
|
sample_t * const __restrict output = fifo_reserve(output_fifo, max_num_out);
|
|
|
|
CORE(N);
|
|
assert(max_num_out - i >= 0);
|
|
fifo_trim_by(output_fifo, max_num_out - i);
|
|
}
|
|
|
|
|
|
|
|
#undef _
|
|
#undef a
|
|
#undef b
|
|
#undef c
|
|
#undef d
|
|
#undef CORE
|
|
#undef cc
|
|
#undef core
|
|
#undef COEF_INTERP
|
|
#undef N
|
|
#undef BEGINNING
|
|
#undef MIDDLE
|
|
#undef END
|
|
#undef CONVOLVE
|
|
#undef FIR_LENGTH
|
|
#undef FUNCTION
|
|
#undef PHASE_BITS
|