mirror of
https://github.com/librempeg/librempeg
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126 lines
4.4 KiB
C
126 lines
4.4 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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/**
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* @file
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* libswresample public header
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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 4
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#define LIBSWRESAMPLE_VERSION_MICRO 0
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#define SWR_CH_MAX 16 ///< Maximum number of channels
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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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*
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* If you use this function you will need to set the parameters (manually or
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* with swr_alloc_set_opts()) before calling swr_init().
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*
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* @see swr_alloc_set_opts(), swr_init(), swr_free()
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* @return NULL on error, allocated context otherwise
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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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*
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* @return AVERROR error code in case of failure.
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*/
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int swr_init(struct SwrContext *s);
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/**
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* Allocate SwrContext if needed and set/reset common parameters.
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*
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* This function does not require s to be allocated with swr_alloc(). On the
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* other hand, swr_alloc() can use swr_alloc_set_opts() to set the parameters
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* on the allocated context.
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*
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* @param s Swr context, can be NULL
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* @param out_ch_layout output channel layout (AV_CH_LAYOUT_*)
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* @param out_sample_fmt output sample format (AV_SAMPLE_FMT_*). Use +0x100 for planar audio
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* @param out_sample_rate output sample rate (frequency in Hz)
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* @param in_ch_layout input channel layout (AV_CH_LAYOUT_*)
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* @param in_sample_fmt input sample format (AV_SAMPLE_FMT_*). Use +0x100 for planar audio
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* @param in_sample_rate input sample rate (frequency in Hz)
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* @param log_offset logging level offset
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* @param log_ctx parent logging context, can be NULL
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*
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* @see swr_init(), swr_free()
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* @return NULL on error, allocated context otherwise
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*/
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struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
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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 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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*
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* in and in_count can be set to 0 to flush the last few samples out at the
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* end.
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*
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* @param s allocated Swr context, with parameters set
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* @param out output buffers, only the first one need be set in case of packed audio
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* @param out_count amount of space available for output in samples per channel
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* @param in input buffers, only the first one need to be set in case of packed audio
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* @param in_count number of input samples available in one channel
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*
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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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/**
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* Activate resampling compensation.
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*/
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void swr_compensate(struct SwrContext *s, int sample_delta, int compensation_distance);
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/**
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* Set a customized input channel mapping.
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*
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* @param s allocated Swr context, not yet initialized
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* @param channel_map customized input channel mapping (array of channel
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* indexes, -1 for a muted channel)
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* @return AVERROR error code in case of failure.
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*/
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int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map);
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#endif
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