b5875b9111
Similar to libswscale this does resampling and format convertion, just for audio instead of video. changing sampling rate, sample formats, channel layouts and sample packing all in one with a very simple public interface. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/*
|
|
* Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at)
|
|
*
|
|
* This file is part of libswresample
|
|
*
|
|
* libswresample 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.
|
|
*
|
|
* libswresample 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 libswresample; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef SWR_H
|
|
#define SWR_H
|
|
|
|
#include <inttypes.h>
|
|
#include "libavutil/samplefmt.h"
|
|
|
|
#define LIBSWRESAMPLE_VERSION_MAJOR 0
|
|
#define LIBSWRESAMPLE_VERSION_MINOR 0
|
|
#define LIBSWRESAMPLE_VERSION_MICRO 0
|
|
|
|
#define SWR_CH_MAX 16
|
|
|
|
#define SWR_FLAG_RESAMPLE 1///< Force resampling even if equal sample rate
|
|
//TODO use int resample ?
|
|
//long term TODO can we enable this dynamically?
|
|
|
|
|
|
struct SwrContext;
|
|
|
|
/**
|
|
* Allocate SwrContext.
|
|
* @see swr_init(),swr_free()
|
|
* @return NULL on error
|
|
*/
|
|
struct SwrContext *swr_alloc(void);
|
|
|
|
/**
|
|
* Initialize context after user parameters have been set.
|
|
* @return negativo n error
|
|
*/
|
|
int swr_init(struct SwrContext *s);
|
|
|
|
/**
|
|
* Allocate SwrContext.
|
|
* @see swr_init(),swr_free()
|
|
* @return NULL on error
|
|
*/
|
|
struct SwrContext *swr_alloc2(struct SwrContext *s, int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
|
|
int64_t in_ch_layout, enum AVSampleFormat in_sample_fmt, int in_sample_rate,
|
|
int log_offset, void *log_ctx);
|
|
|
|
/**
|
|
* Free the given SwrContext.
|
|
* And set the pointer to NULL
|
|
*/
|
|
void swr_free(struct SwrContext **s);
|
|
|
|
/**
|
|
* Convert audio.
|
|
* @param in_count Number of input samples available in one channel.
|
|
* @param out_count Amount of space available for output in samples per channel.
|
|
* @return number of samples output per channel
|
|
*/
|
|
int swr_convert(struct SwrContext *s, uint8_t *out[SWR_CH_MAX], int out_count,
|
|
const uint8_t *in [SWR_CH_MAX], int in_count);
|
|
|
|
void swr_compensate(struct SwrContext *s, int sample_delta, int compensation_distance);
|
|
|
|
#endif
|