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 "config_components.h"
23
24 #include <string.h>
25
26 #include "avcodec.h"
27 #include "ass.h"
28 #include "codec_internal.h"
29 #include "libavutil/avstring.h"
30 #include "libavutil/internal.h"
31 #include "libavutil/mem.h"
32
ass_encode_init(AVCodecContext * avctx)33 static av_cold int ass_encode_init(AVCodecContext *avctx)
34 {
35 avctx->extradata = av_malloc(avctx->subtitle_header_size + 1);
36 if (!avctx->extradata)
37 return AVERROR(ENOMEM);
38 memcpy(avctx->extradata, avctx->subtitle_header, avctx->subtitle_header_size);
39 avctx->extradata_size = avctx->subtitle_header_size;
40 avctx->extradata[avctx->extradata_size] = 0;
41 return 0;
42 }
43
ass_encode_frame(AVCodecContext * avctx,unsigned char * buf,int bufsize,const AVSubtitle * sub)44 static int ass_encode_frame(AVCodecContext *avctx,
45 unsigned char *buf, int bufsize,
46 const AVSubtitle *sub)
47 {
48 int i, len, total_len = 0;
49
50 for (i=0; i<sub->num_rects; i++) {
51 const char *ass = sub->rects[i]->ass;
52
53 if (sub->rects[i]->type != SUBTITLE_ASS) {
54 av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
55 return AVERROR(EINVAL);
56 }
57
58 len = av_strlcpy(buf+total_len, ass, bufsize-total_len);
59
60 if (len > bufsize-total_len-1) {
61 av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
62 return AVERROR_BUFFER_TOO_SMALL;
63 }
64
65 total_len += len;
66 }
67
68 return total_len;
69 }
70
71 #if CONFIG_SSA_ENCODER
72 const FFCodec ff_ssa_encoder = {
73 .p.name = "ssa",
74 .p.long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"),
75 .p.type = AVMEDIA_TYPE_SUBTITLE,
76 .p.id = AV_CODEC_ID_ASS,
77 .init = ass_encode_init,
78 FF_CODEC_ENCODE_SUB_CB(ass_encode_frame),
79 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
80 };
81 #endif
82
83 #if CONFIG_ASS_ENCODER
84 const FFCodec ff_ass_encoder = {
85 .p.name = "ass",
86 .p.long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"),
87 .p.type = AVMEDIA_TYPE_SUBTITLE,
88 .p.id = AV_CODEC_ID_ASS,
89 .init = ass_encode_init,
90 FF_CODEC_ENCODE_SUB_CB(ass_encode_frame),
91 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
92 };
93 #endif
94