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/*
* Copyright (c) Stefano Sabatini | stefasab at gmail.com
* Copyright (c) S.N. Hemanth Meenakshisundaram | smeenaks at ucsd.edu
*
* 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
* 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVFILTER_AUDIO_H
#define AVFILTER_AUDIO_H
#include "avfilter.h"
#include "filters.h"
/**
* An AVFilterPad array whose only entry has name "default"
* and is of type AVMEDIA_TYPE_AUDIO.
*/
extern const AVFilterPad ff_audio_default_filterpad[1];
/** default handler for get_audio_buffer() for audio inputs */
AVFrame *ff_default_get_audio_buffer(AVFilterLink *link, int nb_samples);
/** get_audio_buffer() handler for filters which simply pass audio along */
AVFrame *ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples);
/**
* Request an audio samples buffer with a specific set of permissions.
*
* @param link the output link to the filter from which the buffer will
* be requested
* @param nb_samples the number of samples per channel
* @return on success an AVFrame owned by the caller, NULL on error
*/
AVFrame *ff_get_audio_buffer(AVFilterLink *link, int nb_samples);
/**
* Parse a sample rate.
*
* @param ret unsigned integer pointer to where the value should be written
* @param arg string to parse
* @param log_ctx log context
* @return >= 0 in case of success, a negative AVERROR code on error
*/
av_warn_unused_result
int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx);
/**
* Parse a channel layout or a corresponding integer representation.
*
* @param ret 64bit integer pointer to where the value should be written.
* @param nret integer pointer to the number of channels;
* if not NULL, then unknown channel layouts are accepted
* @param arg string to parse
* @param log_ctx log context
* @return >= 0 in case of success, a negative AVERROR code on error
*/
av_warn_unused_result
int ff_parse_channel_layout(AVChannelLayout *ret, int *nret, const char *arg,
void *log_ctx);
#endif /* AVFILTER_AUDIO_H */
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