/* * 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_resultint 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_resultint ff_parse_channel_layout(AVChannelLayout *ret, int *nret, const char *arg,                            void *log_ctx); #endif /* AVFILTER_AUDIO_H */