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2ba45a60 DM |
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 "ass_split.h" | |
27 | #include "libavutil/internal.h" | |
28 | #include "libavutil/mem.h" | |
29 | ||
30 | static av_cold int ass_decode_init(AVCodecContext *avctx) | |
31 | { | |
32 | avctx->subtitle_header = av_malloc(avctx->extradata_size + 1); | |
33 | if (!avctx->subtitle_header) | |
34 | return AVERROR(ENOMEM); | |
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 | avctx->priv_data = ff_ass_split(avctx->extradata); | |
39 | if(!avctx->priv_data) | |
40 | return -1; | |
41 | return 0; | |
42 | } | |
43 | ||
44 | static int ass_decode_close(AVCodecContext *avctx) | |
45 | { | |
46 | ff_ass_split_free(avctx->priv_data); | |
47 | avctx->priv_data = NULL; | |
48 | return 0; | |
49 | } | |
50 | ||
51 | #if CONFIG_SSA_DECODER | |
52 | static int ssa_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, | |
53 | AVPacket *avpkt) | |
54 | { | |
55 | const char *ptr = avpkt->data; | |
56 | int len, size = avpkt->size; | |
57 | ||
58 | while (size > 0) { | |
59 | int duration; | |
60 | ASSDialog *dialog = ff_ass_split_dialog(avctx->priv_data, ptr, 0, NULL); | |
61 | if (!dialog) | |
62 | return AVERROR_INVALIDDATA; | |
63 | duration = dialog->end - dialog->start; | |
64 | len = ff_ass_add_rect(data, ptr, 0, duration, 1); | |
65 | if (len < 0) | |
66 | return len; | |
67 | ptr += len; | |
68 | size -= len; | |
69 | } | |
70 | ||
71 | *got_sub_ptr = avpkt->size > 0; | |
72 | return avpkt->size; | |
73 | } | |
74 | ||
75 | AVCodec ff_ssa_decoder = { | |
76 | .name = "ssa", | |
77 | .long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"), | |
78 | .type = AVMEDIA_TYPE_SUBTITLE, | |
79 | .id = AV_CODEC_ID_SSA, | |
80 | .init = ass_decode_init, | |
81 | .decode = ssa_decode_frame, | |
82 | .close = ass_decode_close, | |
83 | }; | |
84 | #endif | |
85 | ||
86 | #if CONFIG_ASS_DECODER | |
87 | static int ass_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, | |
88 | AVPacket *avpkt) | |
89 | { | |
90 | int ret; | |
91 | AVSubtitle *sub = data; | |
92 | const char *ptr = avpkt->data; | |
93 | static const AVRational ass_tb = {1, 100}; | |
94 | const int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, ass_tb); | |
95 | const int ts_duration = av_rescale_q(avpkt->duration, avctx->time_base, ass_tb); | |
96 | ||
97 | if (avpkt->size <= 0) | |
98 | return avpkt->size; | |
99 | ||
100 | ret = ff_ass_add_rect(sub, ptr, ts_start, ts_duration, 2); | |
101 | if (ret < 0) { | |
102 | if (ret == AVERROR_INVALIDDATA) | |
103 | av_log(avctx, AV_LOG_ERROR, "Invalid ASS packet\n"); | |
104 | return ret; | |
105 | } | |
106 | ||
107 | *got_sub_ptr = avpkt->size > 0; | |
108 | return avpkt->size; | |
109 | } | |
110 | ||
111 | AVCodec ff_ass_decoder = { | |
112 | .name = "ass", | |
113 | .long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"), | |
114 | .type = AVMEDIA_TYPE_SUBTITLE, | |
115 | .id = AV_CODEC_ID_ASS, | |
116 | .init = ass_decode_init, | |
117 | .decode = ass_decode_frame, | |
118 | .close = ass_decode_close, | |
119 | }; | |
120 | #endif |