2 * This file is part of Libav.
4 * Libav is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * Libav is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #ifndef AVFILTER_AUDIO_H
20 #define AVFILTER_AUDIO_H
24 /** default handler for get_audio_buffer() for audio inputs */
25 AVFilterBufferRef *ff_default_get_audio_buffer(AVFilterLink *link, int perms,
28 /** get_audio_buffer() handler for filters which simply pass audio along */
29 AVFilterBufferRef *ff_null_get_audio_buffer(AVFilterLink *link, int perms,
33 * Request an audio samples buffer with a specific set of permissions.
35 * @param link the output link to the filter from which the buffer will
37 * @param perms the required access permissions
38 * @param nb_samples the number of samples per channel
39 * @return A reference to the samples. This must be unreferenced with
40 * avfilter_unref_buffer when you are finished with it.
42 AVFilterBufferRef *ff_get_audio_buffer(AVFilterLink *link, int perms,
46 * Send a buffer of audio samples to the next filter.
48 * @param link the output link over which the audio samples are being sent
49 * @param samplesref a reference to the buffer of audio samples being sent. The
50 * receiving filter will free this reference when it no longer
51 * needs it or pass it on to the next filter.
53 * @return >= 0 on success, a negative AVERROR on error. The receiving filter
54 * is responsible for unreferencing samplesref in case of error.
56 int ff_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref);
58 #endif /* AVFILTER_AUDIO_H */