1/*
2 * SSA/ASS encoder
3 * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
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 "libavutil/avstring.h"
24
25static 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
35static 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
60AVCodec ff_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};
68