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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 <string.h> | |
23 | ||
24 | #include "avcodec.h" | |
25 | #include "ass_split.h" | |
26 | #include "ass.h" | |
27 | #include "libavutil/avstring.h" | |
28 | #include "libavutil/internal.h" | |
29 | #include "libavutil/mem.h" | |
30 | ||
31 | typedef struct { | |
32 | int id; ///< current event id, ReadOrder field | |
33 | } ASSEncodeContext; | |
34 | ||
35 | static av_cold int ass_encode_init(AVCodecContext *avctx) | |
36 | { | |
37 | avctx->extradata = av_malloc(avctx->subtitle_header_size + 1); | |
38 | if (!avctx->extradata) | |
39 | return AVERROR(ENOMEM); | |
40 | memcpy(avctx->extradata, avctx->subtitle_header, avctx->subtitle_header_size); | |
41 | avctx->extradata_size = avctx->subtitle_header_size; | |
42 | avctx->extradata[avctx->extradata_size] = 0; | |
43 | return 0; | |
44 | } | |
45 | ||
46 | static int ass_encode_frame(AVCodecContext *avctx, | |
47 | unsigned char *buf, int bufsize, | |
48 | const AVSubtitle *sub) | |
49 | { | |
50 | ASSEncodeContext *s = avctx->priv_data; | |
51 | int i, len, total_len = 0; | |
52 | ||
53 | for (i=0; i<sub->num_rects; i++) { | |
54 | char ass_line[2048]; | |
55 | const char *ass = sub->rects[i]->ass; | |
56 | ||
57 | if (sub->rects[i]->type != SUBTITLE_ASS) { | |
58 | av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n"); | |
59 | return -1; | |
60 | } | |
61 | ||
62 | if (strncmp(ass, "Dialogue: ", 10)) { | |
63 | av_log(avctx, AV_LOG_ERROR, "AVSubtitle rectangle ass \"%s\"" | |
64 | " does not look like a SSA markup\n", ass); | |
65 | return AVERROR_INVALIDDATA; | |
66 | } | |
67 | ||
68 | if (avctx->codec->id == AV_CODEC_ID_ASS) { | |
69 | long int layer; | |
70 | char *p; | |
71 | ||
72 | if (i > 0) { | |
73 | av_log(avctx, AV_LOG_ERROR, "ASS encoder supports only one " | |
74 | "ASS rectangle field.\n"); | |
75 | return AVERROR_INVALIDDATA; | |
76 | } | |
77 | ||
78 | ass += 10; // skip "Dialogue: " | |
79 | /* parse Layer field. If it's a Marked field, the content | |
80 | * will be "Marked=N" instead of the layer num, so we will | |
81 | * have layer=0, which is fine. */ | |
82 | layer = strtol(ass, &p, 10); | |
83 | ||
84 | #define SKIP_ENTRY(ptr) do { \ | |
85 | char *sep = strchr(ptr, ','); \ | |
86 | if (sep) \ | |
87 | ptr = sep + 1; \ | |
88 | } while (0) | |
89 | ||
90 | SKIP_ENTRY(p); // skip layer or marked | |
91 | SKIP_ENTRY(p); // skip start timestamp | |
92 | SKIP_ENTRY(p); // skip end timestamp | |
93 | snprintf(ass_line, sizeof(ass_line), "%d,%ld,%s", ++s->id, layer, p); | |
94 | ass_line[strcspn(ass_line, "\r\n")] = 0; | |
95 | ass = ass_line; | |
96 | } | |
97 | len = av_strlcpy(buf+total_len, ass, bufsize-total_len); | |
98 | ||
99 | if (len > bufsize-total_len-1) { | |
100 | av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n"); | |
101 | return -1; | |
102 | } | |
103 | ||
104 | total_len += len; | |
105 | } | |
106 | ||
107 | return total_len; | |
108 | } | |
109 | ||
110 | #if CONFIG_SSA_ENCODER | |
111 | AVCodec ff_ssa_encoder = { | |
112 | .name = "ssa", | |
113 | .long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"), | |
114 | .type = AVMEDIA_TYPE_SUBTITLE, | |
115 | .id = AV_CODEC_ID_SSA, | |
116 | .init = ass_encode_init, | |
117 | .encode_sub = ass_encode_frame, | |
118 | .priv_data_size = sizeof(ASSEncodeContext), | |
119 | }; | |
120 | #endif | |
121 | ||
122 | #if CONFIG_ASS_ENCODER | |
123 | AVCodec ff_ass_encoder = { | |
124 | .name = "ass", | |
125 | .long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"), | |
126 | .type = AVMEDIA_TYPE_SUBTITLE, | |
127 | .id = AV_CODEC_ID_ASS, | |
128 | .init = ass_encode_init, | |
129 | .encode_sub = ass_encode_frame, | |
130 | .priv_data_size = sizeof(ASSEncodeContext), | |
131 | }; | |
132 | #endif |