FFmpeg/libswresample/resample.h
Muhammad Faiz 06f94149c6 swresample/resample: optimize exact_rational=on:linear_interp=on case
separate dsp.resample to dsp.resample_common and dsp.resample_linear
and choose to call faster resample_common even when linear_interp=on
when c->frac and c->dst_incr_mod are both zero

speed up resampling when exact_rational and linear_interp are both
enabled because exact_rational force c->frac and c->dst_incr_mod to
be zero when soft compensation does not happen

benchmark on exact_rational=on:linear_interp=on
        old     new
real    8.432s  5.097s
user    7.679s  4.989s
sys     0.125s  0.107s

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>
2016-11-25 03:22:04 +07:00

68 lines
2.2 KiB
C

/*
* audio resampling
* Copyright (c) 2004-2012 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef SWRESAMPLE_RESAMPLE_H
#define SWRESAMPLE_RESAMPLE_H
#include "libavutil/log.h"
#include "libavutil/samplefmt.h"
#include "swresample_internal.h"
typedef struct ResampleContext {
const AVClass *av_class;
uint8_t *filter_bank;
int filter_length;
int filter_alloc;
int ideal_dst_incr;
int dst_incr;
int dst_incr_div;
int dst_incr_mod;
int index;
int frac;
int src_incr;
int compensation_distance;
int phase_count;
int linear;
enum SwrFilterType filter_type;
double kaiser_beta;
double factor;
enum AVSampleFormat format;
int felem_size;
int filter_shift;
int phase_count_compensation; /* desired phase_count when compensation is enabled */
struct {
void (*resample_one)(void *dst, const void *src,
int n, int64_t index, int64_t incr);
int (*resample_common)(struct ResampleContext *c, void *dst,
const void *src, int n, int update_ctx);
int (*resample_linear)(struct ResampleContext *c, void *dst,
const void *src, int n, int update_ctx);
} dsp;
} ResampleContext;
void swri_resample_dsp_init(ResampleContext *c);
void swri_resample_dsp_x86_init(ResampleContext *c);
void swri_resample_dsp_arm_init(ResampleContext *c);
#endif /* SWRESAMPLE_RESAMPLE_H */