lavc: add a new bitstream filtering API
[libav.git] / libavcodec / chomp_bsf.c
1 /*
2 * Chomp bitstream filter
3 * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "avcodec.h"
23 #include "bsf.h"
24 #include "internal.h"
25
26 static int chomp_filter(AVBSFContext *ctx, AVPacket *out)
27 {
28 AVPacket *in;
29 int ret;
30
31 ret = ff_bsf_get_packet(ctx, &in);
32 if (ret < 0)
33 return ret;
34
35 while (in->size > 0 && !in->data[in->size - 1])
36 in->size--;
37
38 av_packet_move_ref(out, in);
39 av_packet_free(&in);
40
41 return 0;
42 }
43
44 /**
45 * This filter removes a string of NULL bytes from the end of a packet.
46 */
47 const AVBitStreamFilter ff_chomp_bsf = {
48 .name = "chomp",
49 .filter = chomp_filter,
50 };