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b8c6e5a661
give high quality resampling
as good as with linear_interp=on
as fast as without linear_interp=on
tested visually with ffplay
ffplay -f lavfi "aevalsrc='sin(10000*t*t)', aresample=osr=48000, showcqt=gamma=5"
ffplay -f lavfi "aevalsrc='sin(10000*t*t)', aresample=osr=48000:linear_interp=on, showcqt=gamma=5"
ffplay -f lavfi "aevalsrc='sin(10000*t*t)', aresample=osr=48000:exact_rational=on, showcqt=gamma=5"
slightly speed improvement
for fair comparison with -cpuflags 0
audio.wav is ~ 1 hour 44100 stereo 16bit wav file
ffmpeg -i audio.wav -af aresample=osr=48000 -f null -
old new
real 13.498s 13.121s
user 13.364s 12.987s
sys 0.131s 0.129s
linear_interp=on
old new
real 23.035s 23.050s
user 22.907s 22.917s
sys 0.119s 0.125s
exact_rational=on
real 12.418s
user 12.298s
sys 0.114s
possibility to decrease memory usage if soft compensation is ignored
Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/*
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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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#ifndef SWRESAMPLE_RESAMPLE_H
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#define SWRESAMPLE_RESAMPLE_H
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#include "libavutil/log.h"
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#include "libavutil/samplefmt.h"
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#include "swresample_internal.h"
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typedef struct ResampleContext {
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const AVClass *av_class;
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uint8_t *filter_bank;
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int filter_length;
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int filter_alloc;
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int ideal_dst_incr;
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int dst_incr;
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int dst_incr_div;
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int dst_incr_mod;
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int index;
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int frac;
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int src_incr;
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int compensation_distance;
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/* TODO remove phase_shift and phase_mask */
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attribute_deprecated int phase_shift;
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attribute_deprecated int phase_mask;
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int phase_count;
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int linear;
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enum SwrFilterType filter_type;
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double kaiser_beta;
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double factor;
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enum AVSampleFormat format;
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int felem_size;
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int filter_shift;
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struct {
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void (*resample_one)(void *dst, const void *src,
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int n, int64_t index, int64_t incr);
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int (*resample)(struct ResampleContext *c, void *dst,
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const void *src, int n, int update_ctx);
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} dsp;
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} ResampleContext;
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void swri_resample_dsp_init(ResampleContext *c);
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void swri_resample_dsp_x86_init(ResampleContext *c);
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void swri_resample_dsp_arm_init(ResampleContext *c);
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#endif /* SWRESAMPLE_RESAMPLE_H */
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