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https://github.com/pineappleEA/pineapple-src.git
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213 lines
5.5 KiB
C
Executable File
213 lines
5.5 KiB
C
Executable File
/*
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* audio resampling
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* Copyright (c) 2004-2012 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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/**
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* @file
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* audio resampling
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* @author Michael Niedermayer <michaelni@gmx.at>
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*/
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#if defined(TEMPLATE_RESAMPLE_DBL)
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# define RENAME(N) N ## _double
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# define FILTER_SHIFT 0
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# define DELEM double
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# define FELEM double
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# define FELEM2 double
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# define FOFFSET 0
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# define OUT(d, v) d = v
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#elif defined(TEMPLATE_RESAMPLE_FLT)
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# define RENAME(N) N ## _float
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# define FILTER_SHIFT 0
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# define DELEM float
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# define FELEM float
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# define FELEM2 float
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# define FOFFSET 0
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# define OUT(d, v) d = v
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#elif defined(TEMPLATE_RESAMPLE_S32)
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# define RENAME(N) N ## _int32
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# define FILTER_SHIFT 30
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# define DELEM int32_t
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# define FELEM int32_t
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# define FELEM2 int64_t
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# define FELEM_MAX INT32_MAX
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# define FELEM_MIN INT32_MIN
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# define FOFFSET (1<<(FILTER_SHIFT-1))
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# define OUT(d, v) (d) = av_clipl_int32((v)>>FILTER_SHIFT)
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#elif defined(TEMPLATE_RESAMPLE_S16)
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# define RENAME(N) N ## _int16
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# define FILTER_SHIFT 15
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# define DELEM int16_t
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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 FELEM_MAX INT16_MAX
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# define FELEM_MIN INT16_MIN
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# define FOFFSET (1<<(FILTER_SHIFT-1))
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# define OUT(d, v) (d) = av_clip_int16((v)>>FILTER_SHIFT)
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#endif
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static void RENAME(resample_one)(void *dest, const void *source,
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int dst_size, int64_t index2, int64_t incr)
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{
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DELEM *dst = dest;
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const DELEM *src = source;
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int dst_index;
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for (dst_index = 0; dst_index < dst_size; dst_index++) {
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dst[dst_index] = src[index2 >> 32];
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index2 += incr;
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}
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}
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static int RENAME(resample_common)(ResampleContext *c,
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void *dest, const void *source,
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int n, int update_ctx)
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{
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DELEM *dst = dest;
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const DELEM *src = source;
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int dst_index;
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int index= c->index;
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int frac= c->frac;
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int sample_index = 0;
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while (index >= c->phase_count) {
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sample_index++;
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index -= c->phase_count;
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}
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for (dst_index = 0; dst_index < n; dst_index++) {
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FELEM *filter = ((FELEM *) c->filter_bank) + c->filter_alloc * index;
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FELEM2 val = FOFFSET;
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FELEM2 val2= 0;
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int i;
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for (i = 0; i + 1 < c->filter_length; i+=2) {
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val += src[sample_index + i ] * (FELEM2)filter[i ];
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val2 += src[sample_index + i + 1] * (FELEM2)filter[i + 1];
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}
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if (i < c->filter_length)
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val += src[sample_index + i ] * (FELEM2)filter[i ];
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#ifdef FELEML
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OUT(dst[dst_index], val + (FELEML)val2);
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#else
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OUT(dst[dst_index], val + val2);
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#endif
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frac += c->dst_incr_mod;
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index += c->dst_incr_div;
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if (frac >= c->src_incr) {
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frac -= c->src_incr;
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index++;
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}
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while (index >= c->phase_count) {
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sample_index++;
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index -= c->phase_count;
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}
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}
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if(update_ctx){
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c->frac= frac;
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c->index= index;
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}
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return sample_index;
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}
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static int RENAME(resample_linear)(ResampleContext *c,
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void *dest, const void *source,
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int n, int update_ctx)
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{
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DELEM *dst = dest;
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const DELEM *src = source;
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int dst_index;
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int index= c->index;
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int frac= c->frac;
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int sample_index = 0;
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#if FILTER_SHIFT == 0
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double inv_src_incr = 1.0 / c->src_incr;
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#endif
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while (index >= c->phase_count) {
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sample_index++;
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index -= c->phase_count;
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}
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for (dst_index = 0; dst_index < n; dst_index++) {
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FELEM *filter = ((FELEM *) c->filter_bank) + c->filter_alloc * index;
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FELEM2 val = FOFFSET, v2 = FOFFSET;
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int i;
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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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v2 += src[sample_index + i] * (FELEM2)filter[i + c->filter_alloc];
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}
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#ifdef FELEML
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val += (v2 - val) * (FELEML) frac / c->src_incr;
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#else
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# if FILTER_SHIFT == 0
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val += (v2 - val) * inv_src_incr * frac;
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# else
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val += (v2 - val) / c->src_incr * frac;
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# endif
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#endif
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OUT(dst[dst_index], val);
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frac += c->dst_incr_mod;
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index += c->dst_incr_div;
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if (frac >= c->src_incr) {
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frac -= c->src_incr;
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index++;
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}
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while (index >= c->phase_count) {
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sample_index++;
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index -= c->phase_count;
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}
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}
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if(update_ctx){
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c->frac= frac;
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c->index= index;
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}
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return sample_index;
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}
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#undef RENAME
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#undef FILTER_SHIFT
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#undef DELEM
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#undef FELEM
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#undef FELEM2
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#undef FELEML
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#undef FELEM_MAX
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#undef FELEM_MIN
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#undef OUT
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#undef FOFFSET
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