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 "codec_internal.h"
27 #include "config_components.h"
28 #include "libavutil/internal.h"
29 #include "libavutil/mem.h"
30
ass_decode_init(AVCodecContext *avctx)31 static av_cold int ass_decode_init(AVCodecContext *avctx)
32 {
33 avctx->subtitle_header = av_malloc(avctx->extradata_size + 1);
34 if (!avctx->subtitle_header)
35 return AVERROR(ENOMEM);
36 if (avctx->extradata_size)
37 memcpy(avctx->subtitle_header, avctx->extradata, avctx->extradata_size);
38 avctx->subtitle_header[avctx->extradata_size] = 0;
39 avctx->subtitle_header_size = avctx->extradata_size;
40 return 0;
41 }
42
ass_decode_frame(AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, const AVPacket *avpkt)43 static int ass_decode_frame(AVCodecContext *avctx, AVSubtitle *sub,
44 int *got_sub_ptr, const AVPacket *avpkt)
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 const FFCodec ff_ssa_decoder = {
66 .p.name = "ssa",
67 .p.long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"),
68 .p.type = AVMEDIA_TYPE_SUBTITLE,
69 .p.id = AV_CODEC_ID_ASS,
70 .init = ass_decode_init,
71 FF_CODEC_DECODE_SUB_CB(ass_decode_frame),
72 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
73 };
74 #endif
75
76 #if CONFIG_ASS_DECODER
77 const FFCodec ff_ass_decoder = {
78 .p.name = "ass",
79 .p.long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"),
80 .p.type = AVMEDIA_TYPE_SUBTITLE,
81 .p.id = AV_CODEC_ID_ASS,
82 .init = ass_decode_init,
83 FF_CODEC_DECODE_SUB_CB(ass_decode_frame),
84 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
85 };
86 #endif
87