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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
/*
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* Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at)
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*
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* This file is part of libswresample
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*
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* libswresample 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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* libswresample 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 libswresample; 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 SWR_H
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#define SWR_H
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#include <inttypes.h>
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#include "libavutil/samplefmt.h"
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#define LIBSWRESAMPLE_VERSION_MAJOR 0
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#define LIBSWRESAMPLE_VERSION_MINOR 0
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#define LIBSWRESAMPLE_VERSION_MICRO 0
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#define SWR_CH_MAX 16
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#define SWR_FLAG_RESAMPLE 1///< Force resampling even if equal sample rate
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//TODO use int resample ?
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//long term TODO can we enable this dynamically?
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struct SwrContext;
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/**
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* Allocate SwrContext.
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* @see swr_init(),swr_free()
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* @return NULL on error
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*/
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struct SwrContext *swr_alloc(void);
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/**
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* Initialize context after user parameters have been set.
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* @return negativo n error
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*/
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int swr_init(struct SwrContext *s);
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/**
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* Allocate SwrContext.
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* @see swr_init(),swr_free()
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* @return NULL on error
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*/
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struct SwrContext *swr_alloc2(struct SwrContext *s, int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
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int64_t in_ch_layout, enum AVSampleFormat in_sample_fmt, int in_sample_rate,
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int log_offset, void *log_ctx);
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/**
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* Free the given SwrContext.
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* And set the pointer to NULL
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*/
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void swr_free(struct SwrContext **s);
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/**
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* Convert audio.
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* @param in_count Number of input samples available in one channel.
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* @param out_count Amount of space available for output in samples per channel.
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* @return number of samples output per channel
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*/
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int swr_convert(struct SwrContext *s, uint8_t *out[SWR_CH_MAX], int out_count,
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const uint8_t *in [SWR_CH_MAX], int in_count);
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void swr_compensate(struct SwrContext *s, int sample_delta, int compensation_distance);
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#endif
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