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* Copyright (c) 2004 Michael Niedermayer <>
* 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
* 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
#include "avresample.h"
#include "internal.h"
#include "audio_data.h"
struct ResampleContext {
AVAudioResampleContext *avr;
AudioData *buffer;
uint8_t *filter_bank;
int filter_length;
int ideal_dst_incr;
int dst_incr;
unsigned int index;
int frac;
int src_incr;
int compensation_distance;
int phase_shift;
int phase_mask;
int linear;
enum AVResampleFilterType filter_type;
int kaiser_beta;
void (*set_filter)(void *filter, double *tab, int phase, int tap_count);
void (*resample_one)(struct ResampleContext *c, void *dst0,
int dst_index, const void *src0,
unsigned int index, int frac);
void (*resample_nearest)(void *dst0, int dst_index,
const void *src0, unsigned int index);
int padding_size;
int initial_padding_filled;
int initial_padding_samples;
int final_padding_filled;
int final_padding_samples;
* Allocate and initialize a ResampleContext.
* The parameters in the AVAudioResampleContext are used to initialize the
* ResampleContext.
* @param avr AVAudioResampleContext
* @return newly-allocated ResampleContext
ResampleContext *ff_audio_resample_init(AVAudioResampleContext *avr);
* Free a ResampleContext.
* @param c ResampleContext
void ff_audio_resample_free(ResampleContext **c);
* Resample audio data.
* Changes the sample rate.
* @par
* All samples in the source data may not be consumed depending on the
* resampling parameters and the size of the output buffer. The unconsumed
* samples are automatically added to the start of the source in the next call.
* If the destination data can be reallocated, that may be done in this function
* in order to fit all available output. If it cannot be reallocated, fewer
* input samples will be consumed in order to have the output fit in the
* destination data buffers.
* @param c ResampleContext
* @param dst destination audio data
* @param src source audio data
* @return 0 on success, negative AVERROR code on failure
int ff_audio_resample(ResampleContext *c, AudioData *dst, AudioData *src);