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Improve ratio accuracy in SINC.

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This commit is contained in:
Themaister 2012-11-29 11:49:57 +01:00
parent c6111a3259
commit c1a00fac4d
1 changed files with 6 additions and 5 deletions
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11
audio/sinc.c
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@ -43,7 +43,8 @@
#endif
#define PHASE_BITS 16
#define PHASES (1 << PHASE_BITS)
#define SUBPHASE_BITS 10
#define PHASES (1 << (PHASE_BITS + SUBPHASE_BITS))
#define SIDELOBES 8
#define TAPS (SIDELOBES * 2)
@ -75,7 +76,7 @@ static inline double lanzcos(double index)
static void init_sinc_table(rarch_resampler_t *resamp)
{
// Sinc phases: [..., p + 3, p + 2, p + 1, p + 0, p - 1, p - 2, p - 3, p - 4, ...]
for (int i = 0; i < PHASES; i++)
for (int i = 0; i < (1 << PHASE_BITS); i++)
{
for (int j = 0; j < TAPS; j++)
{
@ -138,7 +139,7 @@ static void process_sinc(rarch_resampler_t *resamp, float *out_buffer)
const float *buffer_l = resamp->buffer_l + resamp->ptr;
const float *buffer_r = resamp->buffer_r + resamp->ptr;
unsigned phase = resamp->time;
unsigned phase = resamp->time >> SUBPHASE_BITS;
const float *phase_table = resamp->phase_table[phase];
for (unsigned i = 0; i < TAPS; i += 8)
@ -173,7 +174,7 @@ static void process_sinc(rarch_resampler_t *resamp, float *out_buffer)
const float *buffer_l = resamp->buffer_l + resamp->ptr;
const float *buffer_r = resamp->buffer_r + resamp->ptr;
unsigned phase = resamp->time;
unsigned phase = resamp->time >> SUBPHASE_BITS;
const float *phase_table = resamp->phase_table[phase];
for (unsigned i = 0; i < TAPS; i += 4)
@ -215,7 +216,7 @@ static void process_sinc(rarch_resampler_t *resamp, float *out_buffer)
const float *buffer_l = resamp->buffer_l + resamp->ptr;
const float *buffer_r = resamp->buffer_r + resamp->ptr;
unsigned phase = resamp->time;
unsigned phase = resamp->time >> SUBPHASE_BITS;
const float *phase_table = resamp->phase_table[phase];
for (unsigned i = 0; i < TAPS; i++)