mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
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
/*
|
|
* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#if defined(CONFIG_RESAMPLE_DBL)
|
|
#define SET_TYPE(func) func ## _dbl
|
|
#define FELEM double
|
|
#define FELEM2 double
|
|
#define FELEML double
|
|
#define OUT(d, v) d = v
|
|
#define DBL_TO_FELEM(d, v) d = v
|
|
#elif defined(CONFIG_RESAMPLE_FLT)
|
|
#define SET_TYPE(func) func ## _flt
|
|
#define FELEM float
|
|
#define FELEM2 float
|
|
#define FELEML float
|
|
#define OUT(d, v) d = v
|
|
#define DBL_TO_FELEM(d, v) d = v
|
|
#elif defined(CONFIG_RESAMPLE_S32)
|
|
#define SET_TYPE(func) func ## _s32
|
|
#define FELEM int32_t
|
|
#define FELEM2 int64_t
|
|
#define FELEML int64_t
|
|
#define OUT(d, v) d = av_clipl_int32((v + (1 << 29)) >> 30)
|
|
#define DBL_TO_FELEM(d, v) d = av_clipl_int32(llrint(v * (1 << 30)));
|
|
#else
|
|
#define SET_TYPE(func) func ## _s16
|
|
#define FELEM int16_t
|
|
#define FELEM2 int32_t
|
|
#define FELEML int64_t
|
|
#define OUT(d, v) d = av_clip_int16((v + (1 << 14)) >> 15)
|
|
#define DBL_TO_FELEM(d, v) d = av_clip_int16(lrint(v * (1 << 15)))
|
|
#endif
|
|
|
|
static void SET_TYPE(resample_one)(ResampleContext *c, int no_filter,
|
|
void *dst0, int dst_index, const void *src0,
|
|
int src_size, int index, int frac)
|
|
{
|
|
FELEM *dst = dst0;
|
|
const FELEM *src = src0;
|
|
|
|
if (no_filter) {
|
|
dst[dst_index] = src[index];
|
|
} else {
|
|
int i;
|
|
int sample_index = index >> c->phase_shift;
|
|
FELEM2 val = 0;
|
|
FELEM *filter = ((FELEM *)c->filter_bank) +
|
|
c->filter_length * (index & c->phase_mask);
|
|
|
|
if (sample_index < 0) {
|
|
for (i = 0; i < c->filter_length; i++)
|
|
val += src[FFABS(sample_index + i) % src_size] *
|
|
(FELEM2)filter[i];
|
|
} else if (c->linear) {
|
|
FELEM2 v2 = 0;
|
|
for (i = 0; i < c->filter_length; i++) {
|
|
val += src[abs(sample_index + i)] * (FELEM2)filter[i];
|
|
v2 += src[abs(sample_index + i)] * (FELEM2)filter[i + c->filter_length];
|
|
}
|
|
val += (v2 - val) * (FELEML)frac / c->src_incr;
|
|
} else {
|
|
for (i = 0; i < c->filter_length; i++)
|
|
val += src[sample_index + i] * (FELEM2)filter[i];
|
|
}
|
|
|
|
OUT(dst[dst_index], val);
|
|
}
|
|
}
|
|
|
|
static void SET_TYPE(set_filter)(void *filter0, double *tab, int phase,
|
|
int tap_count)
|
|
{
|
|
int i;
|
|
FELEM *filter = ((FELEM *)filter0) + phase * tap_count;
|
|
for (i = 0; i < tap_count; i++) {
|
|
DBL_TO_FELEM(filter[i], tab[i]);
|
|
}
|
|
}
|
|
|
|
#undef SET_TYPE
|
|
#undef FELEM
|
|
#undef FELEM2
|
|
#undef FELEML
|
|
#undef OUT
|
|
#undef DBL_TO_FELEM
|