mirror of https://git.ffmpeg.org/ffmpeg.git
145 lines
4.8 KiB
C
145 lines
4.8 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* libswresample public header
|
|
*/
|
|
|
|
#ifndef SWR_H
|
|
#define SWR_H
|
|
|
|
#include <inttypes.h>
|
|
#include "libavutil/samplefmt.h"
|
|
|
|
#define LIBSWRESAMPLE_VERSION_MAJOR 0
|
|
#define LIBSWRESAMPLE_VERSION_MINOR 5
|
|
#define LIBSWRESAMPLE_VERSION_MICRO 100
|
|
|
|
#define LIBSWRESAMPLE_VERSION_INT AV_VERSION_INT(LIBSWRESAMPLE_VERSION_MAJOR, \
|
|
LIBSWRESAMPLE_VERSION_MINOR, \
|
|
LIBSWRESAMPLE_VERSION_MICRO)
|
|
|
|
#define SWR_CH_MAX 16 ///< Maximum number of channels
|
|
|
|
#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.
|
|
*
|
|
* If you use this function you will need to set the parameters (manually or
|
|
* with swr_alloc_set_opts()) before calling swr_init().
|
|
*
|
|
* @see swr_alloc_set_opts(), swr_init(), swr_free()
|
|
* @return NULL on error, allocated context otherwise
|
|
*/
|
|
struct SwrContext *swr_alloc(void);
|
|
|
|
/**
|
|
* Initialize context after user parameters have been set.
|
|
*
|
|
* @return AVERROR error code in case of failure.
|
|
*/
|
|
int swr_init(struct SwrContext *s);
|
|
|
|
/**
|
|
* Allocate SwrContext if needed and set/reset common parameters.
|
|
*
|
|
* This function does not require s to be allocated with swr_alloc(). On the
|
|
* other hand, swr_alloc() can use swr_alloc_set_opts() to set the parameters
|
|
* on the allocated context.
|
|
*
|
|
* @param s Swr context, can be NULL
|
|
* @param out_ch_layout output channel layout (AV_CH_LAYOUT_*)
|
|
* @param out_sample_fmt output sample format (AV_SAMPLE_FMT_*).
|
|
* @param out_sample_rate output sample rate (frequency in Hz)
|
|
* @param in_ch_layout input channel layout (AV_CH_LAYOUT_*)
|
|
* @param in_sample_fmt input sample format (AV_SAMPLE_FMT_*).
|
|
* @param in_sample_rate input sample rate (frequency in Hz)
|
|
* @param log_offset logging level offset
|
|
* @param log_ctx parent logging context, can be NULL
|
|
*
|
|
* @see swr_init(), swr_free()
|
|
* @return NULL on error, allocated context otherwise
|
|
*/
|
|
struct SwrContext *swr_alloc_set_opts(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.
|
|
*
|
|
* in and in_count can be set to 0 to flush the last few samples out at the
|
|
* end.
|
|
*
|
|
* @param s allocated Swr context, with parameters set
|
|
* @param out output buffers, only the first one need be set in case of packed audio
|
|
* @param out_count amount of space available for output in samples per channel
|
|
* @param in input buffers, only the first one need to be set in case of packed audio
|
|
* @param in_count number of input samples available in one 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);
|
|
|
|
/**
|
|
* Activate resampling compensation.
|
|
*/
|
|
void swr_compensate(struct SwrContext *s, int sample_delta, int compensation_distance);
|
|
|
|
/**
|
|
* Set a customized input channel mapping.
|
|
*
|
|
* @param s allocated Swr context, not yet initialized
|
|
* @param channel_map customized input channel mapping (array of channel
|
|
* indexes, -1 for a muted channel)
|
|
* @return AVERROR error code in case of failure.
|
|
*/
|
|
int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map);
|
|
|
|
/**
|
|
* Return the LIBSWRESAMPLE_VERSION_INT constant.
|
|
*/
|
|
unsigned swresample_version(void);
|
|
|
|
/**
|
|
* Return the swr build-time configuration.
|
|
*/
|
|
const char *swresample_configuration(void);
|
|
|
|
/**
|
|
* Return the swr license.
|
|
*/
|
|
const char *swresample_license(void);
|
|
|
|
#endif
|