buffersink.h 2.36 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
/*
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVFILTER_BUFFERSINK_H
#define AVFILTER_BUFFERSINK_H

/**
 * @file
 * memory buffer sink API
 */

#include "avfilter.h"

/**
 * Get a buffer with filtered data from sink and put it in buf.
 *
32
 * @param ctx pointer to a context of a buffersink or abuffersink AVFilter.
33 34 35 36 37 38 39 40
 * @param buf pointer to the buffer will be written here if buf is non-NULL. buf
 *            must be freed by the caller using avfilter_unref_buffer().
 *            Buf may also be NULL to query whether a buffer is ready to be
 *            output.
 *
 * @return >= 0 in case of success, a negative AVERROR code in case of
 *         failure.
 */
41
int av_buffersink_read(AVFilterContext *ctx, AVFilterBufferRef **buf);
42

43 44 45 46 47
/**
 * Same as av_buffersink_read, but with the ability to specify the number of
 * samples read. This function is less efficient than av_buffersink_read(),
 * because it copies the data around.
 *
48
 * @param ctx pointer to a context of the abuffersink AVFilter.
49 50 51 52 53 54 55 56 57 58 59 60 61
 * @param buf pointer to the buffer will be written here if buf is non-NULL. buf
 *            must be freed by the caller using avfilter_unref_buffer(). buf
 *            will contain exactly nb_samples audio samples, except at the end
 *            of stream, when it can contain less than nb_samples.
 *            Buf may also be NULL to query whether a buffer is ready to be
 *            output.
 *
 * @warning do not mix this function with av_buffersink_read(). Use only one or
 * the other with a single sink, not both.
 */
int av_buffersink_read_samples(AVFilterContext *ctx, AVFilterBufferRef **buf,
                               int nb_samples);

62
#endif /* AVFILTER_BUFFERSINK_H */