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6410397600
Based partially on implementation by Michael Niedermayer <michaelni@gmx.at> in libswresample in FFmpeg. See commits:7f1ae79d3824ab1abfb6
103 lines
3.4 KiB
C
103 lines
3.4 KiB
C
/*
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* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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(CONFIG_RESAMPLE_DBL)
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#define SET_TYPE(func) func ## _dbl
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#define FELEM double
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#define FELEM2 double
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#define FELEML double
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#define OUT(d, v) d = v
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#define DBL_TO_FELEM(d, v) d = v
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#elif defined(CONFIG_RESAMPLE_FLT)
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#define SET_TYPE(func) func ## _flt
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#define FELEM float
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#define FELEM2 float
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#define FELEML float
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#define OUT(d, v) d = v
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#define DBL_TO_FELEM(d, v) d = v
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#elif defined(CONFIG_RESAMPLE_S32)
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#define SET_TYPE(func) func ## _s32
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#define FELEM int32_t
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#define FELEM2 int64_t
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#define FELEML int64_t
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#define OUT(d, v) d = av_clipl_int32((v + (1 << 29)) >> 30)
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#define DBL_TO_FELEM(d, v) d = av_clipl_int32(llrint(v * (1 << 30)));
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#else
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#define SET_TYPE(func) func ## _s16
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#define FELEM int16_t
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#define FELEM2 int32_t
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#define FELEML int64_t
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#define OUT(d, v) d = av_clip_int16((v + (1 << 14)) >> 15)
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#define DBL_TO_FELEM(d, v) d = av_clip_int16(lrint(v * (1 << 15)))
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#endif
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static void SET_TYPE(resample_one)(ResampleContext *c, int no_filter,
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void *dst0, int dst_index, const void *src0,
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int src_size, int index, int frac)
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{
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FELEM *dst = dst0;
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const FELEM *src = src0;
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if (no_filter) {
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dst[dst_index] = src[index];
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} else {
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int i;
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int sample_index = index >> c->phase_shift;
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FELEM2 val = 0;
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FELEM *filter = ((FELEM *)c->filter_bank) +
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c->filter_length * (index & c->phase_mask);
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if (sample_index < 0) {
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for (i = 0; i < c->filter_length; i++)
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val += src[FFABS(sample_index + i) % src_size] *
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(FELEM2)filter[i];
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} else if (c->linear) {
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FELEM2 v2 = 0;
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for (i = 0; i < c->filter_length; i++) {
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val += src[abs(sample_index + i)] * (FELEM2)filter[i];
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v2 += src[abs(sample_index + i)] * (FELEM2)filter[i + c->filter_length];
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}
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val += (v2 - val) * (FELEML)frac / c->src_incr;
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} else {
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for (i = 0; i < c->filter_length; i++)
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val += src[sample_index + i] * (FELEM2)filter[i];
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}
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OUT(dst[dst_index], val);
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}
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}
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static void SET_TYPE(set_filter)(void *filter0, double *tab, int phase,
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int tap_count)
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{
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int i;
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FELEM *filter = ((FELEM *)filter0) + phase * tap_count;
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for (i = 0; i < tap_count; i++) {
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DBL_TO_FELEM(filter[i], tab[i]);
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}
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}
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#undef SET_TYPE
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#undef FELEM
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#undef FELEM2
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#undef FELEML
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#undef OUT
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#undef DBL_TO_FELEM
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