0,0 → 1,67 |
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#if defined(TEMPLATE_DITHER_DBL) |
# define RENAME(N) N ## _double |
# define DELEM double |
# define CLIP(v) |
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#elif defined(TEMPLATE_DITHER_FLT) |
# define RENAME(N) N ## _float |
# define DELEM float |
# define CLIP(v) |
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#elif defined(TEMPLATE_DITHER_S32) |
# define RENAME(N) N ## _int32 |
# define DELEM int32_t |
# define CLIP(v) v = FFMAX(FFMIN(v, INT32_MAX), INT32_MIN) |
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#elif defined(TEMPLATE_DITHER_S16) |
# define RENAME(N) N ## _int16 |
# define DELEM int16_t |
# define CLIP(v) v = FFMAX(FFMIN(v, INT16_MAX), INT16_MIN) |
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#else |
ERROR |
#endif |
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void RENAME(swri_noise_shaping)(SwrContext *s, AudioData *dsts, const AudioData *srcs, const AudioData *noises, int count){ |
int pos = s->dither.ns_pos; |
int i, j, ch; |
int taps = s->dither.ns_taps; |
float S = s->dither.ns_scale; |
float S_1 = s->dither.ns_scale_1; |
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av_assert2((taps&3) != 2); |
av_assert2((taps&3) != 3 || s->dither.ns_coeffs[taps] == 0); |
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for (ch=0; ch<srcs->ch_count; ch++) { |
const float *noise = ((const float *)noises->ch[ch]) + s->dither.noise_pos; |
const DELEM *src = (const DELEM*)srcs->ch[ch]; |
DELEM *dst = (DELEM*)dsts->ch[ch]; |
float *ns_errors = s->dither.ns_errors[ch]; |
const float *ns_coeffs = s->dither.ns_coeffs; |
pos = s->dither.ns_pos; |
for (i=0; i<count; i++) { |
double d1, d = src[i]*S_1; |
for(j=0; j<taps-2; j+=4) { |
d -= ns_coeffs[j ] * ns_errors[pos + j ] |
+ns_coeffs[j + 1] * ns_errors[pos + j + 1] |
+ns_coeffs[j + 2] * ns_errors[pos + j + 2] |
+ns_coeffs[j + 3] * ns_errors[pos + j + 3]; |
} |
if(j < taps) |
d -= ns_coeffs[j] * ns_errors[pos + j]; |
pos = pos ? pos - 1 : taps - 1; |
d1 = rint(d + noise[i]); |
ns_errors[pos + taps] = ns_errors[pos] = d1 - d; |
d1 *= S; |
CLIP(d1); |
dst[i] = d1; |
} |
} |
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s->dither.ns_pos = pos; |
} |
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#undef RENAME |
#undef DELEM |
#undef CLIP |