1 /*
2 * SSA/ASS decoder
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 <string.h>
23
24 #include "avcodec.h"
25 #include "ass.h"
26 #include "libavutil/internal.h"
27 #include "libavutil/mem.h"
28
ass_decode_init(AVCodecContext * avctx)29 static av_cold int ass_decode_init(AVCodecContext *avctx)
30 {
31 avctx->subtitle_header = av_malloc(avctx->extradata_size + 1);
32 if (!avctx->subtitle_header)
33 return AVERROR(ENOMEM);
34 if (avctx->extradata_size)
35 memcpy(avctx->subtitle_header, avctx->extradata, avctx->extradata_size);
36 avctx->subtitle_header[avctx->extradata_size] = 0;
37 avctx->subtitle_header_size = avctx->extradata_size;
38 return 0;
39 }
40
ass_decode_frame(AVCodecContext * avctx,void * data,int * got_sub_ptr,AVPacket * avpkt)41 static int ass_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr,
42 AVPacket *avpkt)
43 {
44 AVSubtitle *sub = data;
45
46 if (avpkt->size <= 0)
47 return avpkt->size;
48
49 sub->rects = av_malloc(sizeof(*sub->rects));
50 if (!sub->rects)
51 return AVERROR(ENOMEM);
52 sub->rects[0] = av_mallocz(sizeof(*sub->rects[0]));
53 if (!sub->rects[0])
54 return AVERROR(ENOMEM);
55 sub->num_rects = 1;
56 sub->rects[0]->type = SUBTITLE_ASS;
57 sub->rects[0]->ass = av_strdup(avpkt->data);
58 if (!sub->rects[0]->ass)
59 return AVERROR(ENOMEM);
60 *got_sub_ptr = 1;
61 return avpkt->size;
62 }
63
64 #if CONFIG_SSA_DECODER
65 AVCodec ff_ssa_decoder = {
66 .name = "ssa",
67 .long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"),
68 .type = AVMEDIA_TYPE_SUBTITLE,
69 .id = AV_CODEC_ID_ASS,
70 .init = ass_decode_init,
71 .decode = ass_decode_frame,
72 };
73 #endif
74
75 #if CONFIG_ASS_DECODER
76 AVCodec ff_ass_decoder = {
77 .name = "ass",
78 .long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"),
79 .type = AVMEDIA_TYPE_SUBTITLE,
80 .id = AV_CODEC_ID_ASS,
81 .init = ass_decode_init,
82 .decode = ass_decode_frame,
83 };
84 #endif
85