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84 lines
2.8 KiB
84 lines
2.8 KiB
/* |
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* This file is part of libswresample |
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* |
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* libswresample is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* libswresample is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with libswresample; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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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) while(0) |
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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) while(0) |
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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 pos = s->dither.ns_pos; |
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int i, j, 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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av_assert2((taps&3) != 2); |
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av_assert2((taps&3) != 3 || s->dither.ns_coeffs[taps] == 0); |
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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-2; j+=4) { |
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d -= ns_coeffs[j ] * ns_errors[pos + j ] |
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+ns_coeffs[j + 1] * ns_errors[pos + j + 1] |
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+ns_coeffs[j + 2] * ns_errors[pos + j + 2] |
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+ns_coeffs[j + 3] * ns_errors[pos + j + 3]; |
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} |
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if(j < taps) |
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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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