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