145 lines
4.8 KiB
C
145 lines
4.8 KiB
C
/*
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* Copyright (C) 2012-2013 Michael Niedermayer (michaelni@gmx.at)
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*
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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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#include "libavutil/avassert.h"
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#include "swresample_internal.h"
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#include "noise_shaping_data.c"
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void swri_get_dither(SwrContext *s, void *dst, int len, unsigned seed, enum AVSampleFormat noise_fmt) {
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double scale = s->dither.noise_scale;
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#define TMP_EXTRA 2
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double *tmp = av_malloc((len + TMP_EXTRA) * sizeof(double));
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int i;
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for(i=0; i<len + TMP_EXTRA; i++){
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double v;
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seed = seed* 1664525 + 1013904223;
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switch(s->dither.method){
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case SWR_DITHER_RECTANGULAR: v= ((double)seed) / UINT_MAX - 0.5; break;
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default:
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av_assert0(s->dither.method < SWR_DITHER_NB);
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v = ((double)seed) / UINT_MAX;
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seed = seed*1664525 + 1013904223;
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v-= ((double)seed) / UINT_MAX;
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break;
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}
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tmp[i] = v;
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}
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for(i=0; i<len; i++){
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double v;
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switch(s->dither.method){
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default:
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av_assert0(s->dither.method < SWR_DITHER_NB);
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v = tmp[i];
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break;
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case SWR_DITHER_TRIANGULAR_HIGHPASS :
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v = (- tmp[i] + 2*tmp[i+1] - tmp[i+2]) / sqrt(6);
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break;
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}
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v*= scale;
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switch(noise_fmt){
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case AV_SAMPLE_FMT_S16P: ((int16_t*)dst)[i] = v; break;
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case AV_SAMPLE_FMT_S32P: ((int32_t*)dst)[i] = v; break;
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case AV_SAMPLE_FMT_FLTP: ((float *)dst)[i] = v; break;
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case AV_SAMPLE_FMT_DBLP: ((double *)dst)[i] = v; break;
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default: av_assert0(0);
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}
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}
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av_free(tmp);
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}
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int swri_dither_init(SwrContext *s, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt)
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{
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int i;
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double scale = 0;
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if (s->dither.method > SWR_DITHER_TRIANGULAR_HIGHPASS && s->dither.method <= SWR_DITHER_NS)
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return AVERROR(EINVAL);
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out_fmt = av_get_packed_sample_fmt(out_fmt);
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in_fmt = av_get_packed_sample_fmt( in_fmt);
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if(in_fmt == AV_SAMPLE_FMT_FLT || in_fmt == AV_SAMPLE_FMT_DBL){
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if(out_fmt == AV_SAMPLE_FMT_S32) scale = 1.0/(1L<<31);
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if(out_fmt == AV_SAMPLE_FMT_S16) scale = 1.0/(1L<<15);
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if(out_fmt == AV_SAMPLE_FMT_U8 ) scale = 1.0/(1L<< 7);
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}
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if(in_fmt == AV_SAMPLE_FMT_S32 && out_fmt == AV_SAMPLE_FMT_S16) scale = 1L<<16;
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if(in_fmt == AV_SAMPLE_FMT_S32 && out_fmt == AV_SAMPLE_FMT_U8 ) scale = 1L<<24;
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if(in_fmt == AV_SAMPLE_FMT_S16 && out_fmt == AV_SAMPLE_FMT_U8 ) scale = 1L<<8;
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scale *= s->dither.scale;
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s->dither.ns_pos = 0;
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s->dither.noise_scale= scale;
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s->dither.ns_scale = scale;
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s->dither.ns_scale_1 = 1/scale;
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memset(s->dither.ns_errors, 0, sizeof(s->dither.ns_errors));
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for (i=0; filters[i].coefs; i++) {
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const filter_t *f = &filters[i];
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if (fabs(s->out_sample_rate - f->rate) / f->rate <= .05 && f->name == s->dither.method) {
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int j;
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s->dither.ns_taps = f->len;
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for (j=0; j<f->len; j++)
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s->dither.ns_coeffs[j] = f->coefs[j];
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s->dither.ns_scale_1 *= 1 - exp(f->gain_cB * M_LN10 * 0.005) * 2 / (1<<(8*av_get_bytes_per_sample(out_fmt)));
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break;
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}
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}
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if (!filters[i].coefs && s->dither.method > SWR_DITHER_NS) {
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av_log(s, AV_LOG_WARNING, "Requested noise shaping dither not available at this sampling rate, using triangular hp dither\n");
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s->dither.method = SWR_DITHER_TRIANGULAR_HIGHPASS;
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}
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av_assert0(!s->preout.count);
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s->dither.noise = s->preout;
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s->dither.temp = s->preout;
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if (s->dither.method > SWR_DITHER_NS) {
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s->dither.noise.bps = 4;
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s->dither.noise.fmt = AV_SAMPLE_FMT_FLTP;
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s->dither.noise_scale = 1;
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}
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return 0;
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}
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#define TEMPLATE_DITHER_S16
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#include "dither_template.c"
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#undef TEMPLATE_DITHER_S16
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#define TEMPLATE_DITHER_S32
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#include "dither_template.c"
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#undef TEMPLATE_DITHER_S32
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#define TEMPLATE_DITHER_FLT
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#include "dither_template.c"
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#undef TEMPLATE_DITHER_FLT
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#define TEMPLATE_DITHER_DBL
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#include "dither_template.c"
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#undef TEMPLATE_DITHER_DBL
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