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https://github.com/FFmpeg/FFmpeg.git
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58 lines
1.6 KiB
C
58 lines
1.6 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 *dsts, const AudioData *srcs, const 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.noise_pos;
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const DELEM *src = (const DELEM*)srcs->ch[ch];
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DELEM *dst = (DELEM*)dsts->ch[ch];
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float *ns_errors = s->dither.ns_errors[ch];
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const float *ns_coeffs = s->dither.ns_coeffs;
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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 = src[i]*S_1;
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for(j=0; j<taps; j++)
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d -= ns_coeffs[j] * ns_errors[pos + j];
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pos = pos ? pos - 1 : taps - 1;
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d1 = rint(d + noise[i]);
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ns_errors[pos + taps] = ns_errors[pos] = d1 - d;
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d1 *= S;
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CLIP(d1);
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dst[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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