c6f017ce5d01ecfb42f54cdfc25cb93412a9f96e
[libav.git] / libavcodec / assenc.c
1 /*
2 * SSA/ASS encoder
3 * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 "libavutil/avstring.h"
24
25 static av_cold int ass_encode_init(AVCodecContext *avctx)
26 {
27 avctx->extradata = av_malloc(avctx->subtitle_header_size);
28 if (!avctx->extradata)
29 return AVERROR(ENOMEM);
30 memcpy(avctx->extradata, avctx->subtitle_header, avctx->subtitle_header_size);
31 avctx->extradata_size = avctx->subtitle_header_size;
32 return 0;
33 }
34
35 static int ass_encode_frame(AVCodecContext *avctx,
36 unsigned char *buf, int bufsize, void *data)
37 {
38 AVSubtitle *sub = data;
39 int i, len, total_len = 0;
40
41 for (i=0; i<sub->num_rects; i++) {
42 if (sub->rects[i]->type != SUBTITLE_ASS) {
43 av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
44 return -1;
45 }
46
47 len = av_strlcpy(buf+total_len, sub->rects[i]->ass, bufsize-total_len);
48
49 if (len > bufsize-total_len-1) {
50 av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
51 return -1;
52 }
53
54 total_len += len;
55 }
56
57 return total_len;
58 }
59
60 AVCodec ass_encoder = {
61 .name = "ass",
62 .long_name = NULL_IF_CONFIG_SMALL("Advanced SubStation Alpha subtitle"),
63 .type = AVMEDIA_TYPE_SUBTITLE,
64 .id = CODEC_ID_SSA,
65 .init = ass_encode_init,
66 .encode = ass_encode_frame,
67 };