82742294b7
The following variants are implemented: lipshitz noise shaping dither shibata noise shaping dither low shibata noise shaping dither high shibata noise shaping dither f-weighted noise shaping dither modified-e-weighted noise shaping dither improved-e-weighted noise shaping dither Data tables taken from SOX Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
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#if defined(TEMPLATE_DITHER_DBL)
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# define RENAME(N) N ## _double
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# define DELEM double
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# define CLIP(v)
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#elif defined(TEMPLATE_DITHER_FLT)
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# define RENAME(N) N ## _float
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# define DELEM float
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# define CLIP(v)
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#elif defined(TEMPLATE_DITHER_S32)
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# define RENAME(N) N ## _int32
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# define DELEM int32_t
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# define CLIP(v) v = FFMAX(FFMIN(v, INT32_MAX), INT32_MIN)
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#elif defined(TEMPLATE_DITHER_S16)
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# define RENAME(N) N ## _int16
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# define DELEM int16_t
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# define CLIP(v) v = FFMAX(FFMIN(v, INT16_MAX), INT16_MIN)
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#else
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ERROR
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#endif
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void RENAME(swri_noise_shaping)(SwrContext *s, AudioData *srcs, AudioData *noises, int count){
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int i, j, pos, ch;
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int taps = s->ns_taps;
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float S = s->ns_scale;
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float S_1 = s->ns_scale_1;
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for (ch=0; ch<srcs->ch_count; ch++) {
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const float *noise = ((const float *)noises->ch[ch]) + s->dither_pos;
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DELEM *data = (DELEM*)srcs->ch[ch];
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pos = s->ns_pos;
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for (i=0; i<count; i++) {
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double d1, d = data[i];
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for(j=0; j<taps; j++)
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d -= s->ns_coeffs[j] * s->ns_errors[ch][pos + j];
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pos = pos ? pos - 1 : pos - 1 + taps;
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d1 = rint((d + noise[i]) * S_1)*S;
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s->ns_errors[ch][pos + taps] = s->ns_errors[ch][pos] = d1 - d;
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CLIP(d1);
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data[i] = d1;
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}
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}
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s->ns_pos = pos;
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}
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#undef RENAME
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#undef DELEM
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#undef CLIP
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