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54 lines
1.5 KiB
54 lines
1.5 KiB
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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->dither.ns_taps; |
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float S = s->dither.ns_scale; |
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float S_1 = s->dither.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.dither_pos; |
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DELEM *data = (DELEM*)srcs->ch[ch]; |
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pos = s->dither.ns_pos; |
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for (i=0; i<count; i++) { |
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double d1, d = data[i]*S_1; |
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for(j=0; j<taps; j++) |
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d -= s->dither.ns_coeffs[j] * s->dither.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]); |
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s->dither.ns_errors[ch][pos + taps] = s->dither.ns_errors[ch][pos] = d1 - d; |
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d1 *= S; |
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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->dither.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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