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https://github.com/libretro/RetroArch
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Start using LERP optionally for SINC again.
This commit is contained in:
Themaister
parent
9dcbfbba0f
commit
d68fe248f3
95
audio/sinc.c
95
audio/sinc.c
@ -22,11 +22,12 @@
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#ifndef RESAMPLER_TEST
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#include "../general.h"
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#else
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#define RARCH_LOG(...)
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#define RARCH_LOG(...) fprintf(stderr, __VA_ARGS__)
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#endif
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#ifdef __SSE__
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@ -45,33 +46,43 @@
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#define SINC_WINDOW_LANCZOS
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#define CUTOFF 0.98
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#define PHASE_BITS 11
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#define SINC_COEFF_LERP 0
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#define SUBPHASE_BITS 10
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#define SIDELOBES 2
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#define ENABLE_AVX 0
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#elif defined(SINC_LOWER_QUALITY)
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#define SINC_WINDOW_LANCZOS
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#define CUTOFF 0.98
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#define PHASE_BITS 12
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#define SUBPHASE_BITS 10
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#define SINC_COEFF_LERP 0
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#define SIDELOBES 4
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#define ENABLE_AVX 0
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#elif defined(SINC_HIGHER_QUALITY)
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#define SINC_WINDOW_KAISER
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#define SINC_WINDOW_KAISER_BETA 10.5
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#define CUTOFF 0.90
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#define PHASE_BITS 16
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#define PHASE_BITS 10
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#define SUBPHASE_BITS 14
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#define SINC_COEFF_LERP 1
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#define SIDELOBES 32
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#define ENABLE_AVX 1
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#elif defined(SINC_HIGHEST_QUALITY)
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#define SINC_WINDOW_KAISER
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#define SINC_WINDOW_KAISER_BETA 14.5
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#define CUTOFF 0.95
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#define PHASE_BITS 16
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#define PHASE_BITS 10
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#define SUBPHASE_BITS 14
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#define SINC_COEFF_LERP 1
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#define SIDELOBES 128
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#define ENABLE_AVX 1
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#else
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#define SINC_WINDOW_KAISER
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#define SINC_WINDOW_KAISER_BETA 5.5
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#define CUTOFF 0.825
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#define PHASE_BITS 14
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#define PHASE_BITS 8
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#define SUBPHASE_BITS 16
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#define SINC_COEFF_LERP 1
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#define SIDELOBES 8
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#define ENABLE_AVX 0
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#endif
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@ -85,14 +96,19 @@
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#include <immintrin.h>
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#endif
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#define SUBPHASE_BITS 10
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#define PHASES (1 << (PHASE_BITS + SUBPHASE_BITS))
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#define TAPS (SIDELOBES * 2)
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#define SUBPHASE_MASK ((1 << SUBPHASE_BITS) - 1)
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#define SUBPHASE_MOD (1.0f / (1 << SUBPHASE_BITS))
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typedef struct rarch_sinc_resampler
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{
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#if SINC_COEFF_LERP
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sample_t phase_table[1 << PHASE_BITS][TAPS * 2];
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#else
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sample_t phase_table[1 << PHASE_BITS][TAPS];
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#endif
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sample_t buffer_l[2 * TAPS];
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sample_t buffer_r[2 * TAPS];
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@ -124,6 +140,7 @@ static inline double besseli0(double x)
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double factorial_mult = 0.0;
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double x_pow = 1.0;
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double two_div_pow = 1.0;
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double x_sqr = x * x;
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// Approximate. This is an infinite sum.
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// Luckily, it converges rather fast.
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@ -132,7 +149,7 @@ static inline double besseli0(double x)
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sum += x_pow * two_div_pow / (factorial * factorial);
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factorial_mult += 1.0;
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x_pow *= x * x;
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x_pow *= x_sqr;
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two_div_pow *= 0.25;
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factorial *= factorial_mult;
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}
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@ -149,21 +166,47 @@ static inline double window_function(double index)
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#endif
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static void init_sinc_table(rarch_sinc_resampler_t *resamp, double cutoff,
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float *phase_table, int phases, int taps)
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float *phase_table, int phases, int taps, bool calculate_delta)
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{
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double window_mod = window_function(0.0); // Need to normalize w(0) to 1.0.
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int stride = calculate_delta ? 2 : 1;
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for (int i = 0; i < phases; i++)
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{
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for (int j = 0; j < taps; j++)
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{
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int n = j * phases + i;
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double window_phase = (double)n / (((1 << PHASE_BITS) * TAPS) - 1.0); // [0, 1].
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window_phase = 2.0 * window_phase - 1.0; // [-1, 1]
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double window_phase = (double)n / (phases * taps); // [0, 1).
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window_phase = 2.0 * window_phase - 1.0; // [-1, 1)
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double sinc_phase = SIDELOBES * window_phase;
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float val = cutoff * sinc(M_PI * sinc_phase * cutoff) * window_function(window_phase) / window_mod;
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phase_table[i * taps + j] = val;
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phase_table[i * stride * taps + j] = val;
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}
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}
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if (calculate_delta)
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{
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for (int i = 0; i < phases - 1; i++)
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{
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for (int j = 0; j < taps; j++)
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{
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float delta = phase_table[(i + 1) * stride * taps + j] - phase_table[i * stride * taps + j];
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phase_table[(i * stride + 1) * taps + j] = delta;
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}
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}
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int i = phases - 1;
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for (int j = 0; j < taps; j++)
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{
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int n = j * phases + (i + 1);
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double window_phase = (double)n / (phases * taps); // [0, 1).
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window_phase = 2.0 * window_phase - 1.0; // [-1, 1)
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double sinc_phase = SIDELOBES * window_phase;
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float val = cutoff * sinc(M_PI * sinc_phase * cutoff) * window_function(window_phase) / window_mod;
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float delta = (val - phase_table[i * stride * taps + j]);
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phase_table[(i * stride + 1) * taps + j] = delta;
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}
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}
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}
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@ -197,10 +240,18 @@ static inline void process_sinc_C(rarch_sinc_resampler_t *resamp, float *out_buf
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unsigned phase = resamp->time >> SUBPHASE_BITS;
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const float *phase_table = resamp->phase_table[phase];
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#if SINC_COEFF_LERP
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const float *delta_table = phase_table + TAPS;
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float delta = (float)(resamp->time & SUBPHASE_MASK) * SUBPHASE_MOD;
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#endif
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for (unsigned i = 0; i < TAPS; i++)
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{
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#if SINC_COEFF_LERP
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float sinc_val = phase_table[i] + delta_table[i] * delta;
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#else
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float sinc_val = phase_table[i];
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#endif
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sum_l += buffer_l[i] * sinc_val;
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sum_r += buffer_r[i] * sinc_val;
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}
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@ -221,13 +272,22 @@ static void process_sinc(rarch_sinc_resampler_t *resamp, float *out_buffer)
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unsigned phase = resamp->time >> SUBPHASE_BITS;
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const float *phase_table = resamp->phase_table[phase];
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#if SINC_COEFF_LERP
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const float *delta_table = phase_table + TAPS;
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__m256 delta = _mm256_set1_ps((float)(resamp->time & SUBPHASE_MASK) * SUBPHASE_MOD);
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#endif
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for (unsigned i = 0; i < TAPS; i += 8)
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{
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__m256 buf_l = _mm256_loadu_ps(buffer_l + i);
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__m256 buf_r = _mm256_loadu_ps(buffer_r + i);
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#if SINC_COEFF_LERP
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__m256 deltas = _mm256_load_ps(delta_table + i);
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__m256 sinc = _mm256_add_ps(_mm256_load_ps(phase_table + i), _mm256_mul_ps(deltas, delta));
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#else
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__m256 sinc = _mm256_load_ps(phase_table + i);
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#endif
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sum_l = _mm256_add_ps(sum_l, _mm256_mul_ps(buf_l, sinc));
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sum_r = _mm256_add_ps(sum_r, _mm256_mul_ps(buf_r, sinc));
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}
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@ -257,13 +317,22 @@ static void process_sinc(rarch_sinc_resampler_t *resamp, float *out_buffer)
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unsigned phase = resamp->time >> SUBPHASE_BITS;
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const float *phase_table = resamp->phase_table[phase];
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#if SINC_COEFF_LERP
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const float *delta_table = phase_table + TAPS;
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__m128 delta = _mm_set1_ps((float)(resamp->time & SUBPHASE_MASK) * SUBPHASE_MOD);
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#endif
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for (unsigned i = 0; i < TAPS; i += 4)
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{
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__m128 buf_l = _mm_loadu_ps(buffer_l + i);
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__m128 buf_r = _mm_loadu_ps(buffer_r + i);
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#if SINC_COEFF_LERP
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__m128 deltas = _mm_load_ps(delta_table + i);
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__m128 sinc = _mm_add_ps(_mm_load_ps(phase_table + i), _mm_mul_ps(deltas, delta));
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#else
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__m128 sinc = _mm_load_ps(phase_table + i);
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#endif
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sum_l = _mm_add_ps(sum_l, _mm_mul_ps(buf_l, sinc));
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sum_r = _mm_add_ps(sum_r, _mm_mul_ps(buf_r, sinc));
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}
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@ -295,6 +364,10 @@ static void process_sinc(rarch_sinc_resampler_t *resamp, float *out_buffer)
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#error "NEON asm requires at least 8 taps (for now)."
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#endif
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#if SINC_COEFF_LERP
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#error "NEON asm does not support SINC lerp."
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#endif
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// Need to make this function pointer as Android doesn't have built-in targets
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// for NEON and plain ARMv7a.
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static void (*process_sinc_func)(rarch_sinc_resampler_t *resamp, float *out_buffer);
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@ -367,7 +440,7 @@ static void *resampler_sinc_new(void)
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memset(re, 0, sizeof(*re));
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init_sinc_table(re, CUTOFF, &re->phase_table[0][0], 1 << PHASE_BITS, TAPS);
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init_sinc_table(re, CUTOFF, &re->phase_table[0][0], 1 << PHASE_BITS, TAPS, SINC_COEFF_LERP);
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#if defined(__AVX__) && ENABLE_AVX
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RARCH_LOG("Sinc resampler [AVX]\n");
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@ -11,7 +11,7 @@ TESTS := test-hermite \
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test-sinc-highest \
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test-snr-sinc-highest
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CFLAGS += -O3 -g -Wall -pedantic -std=gnu99 -DRESAMPLER_TEST
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CFLAGS += -O3 -g -Wall -pedantic -march=native -std=gnu99 -DRESAMPLER_TEST
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LDFLAGS += -lm
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all: $(TESTS)
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