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2ba45a60 DM |
1 | /* |
2 | * SSA/ASS muxer | |
3 | * Copyright (c) 2008 Michael Niedermayer | |
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 "libavutil/avstring.h" | |
23 | #include "avformat.h" | |
24 | #include "internal.h" | |
25 | ||
26 | typedef struct DialogueLine { | |
27 | int readorder; | |
28 | char *line; | |
29 | struct DialogueLine *prev, *next; | |
30 | } DialogueLine; | |
31 | ||
32 | typedef struct ASSContext{ | |
33 | unsigned int extra_index; | |
34 | int write_ts; // 0: ssa (timing in payload), 1: ass (matroska like) | |
35 | int expected_readorder; | |
36 | DialogueLine *dialogue_cache; | |
37 | DialogueLine *last_added_dialogue; | |
38 | int cache_size; | |
39 | }ASSContext; | |
40 | ||
41 | static int write_header(AVFormatContext *s) | |
42 | { | |
43 | ASSContext *ass = s->priv_data; | |
44 | AVCodecContext *avctx= s->streams[0]->codec; | |
45 | uint8_t *last= NULL; | |
46 | ||
47 | if (s->nb_streams != 1 || (avctx->codec_id != AV_CODEC_ID_SSA && | |
48 | avctx->codec_id != AV_CODEC_ID_ASS)) { | |
49 | av_log(s, AV_LOG_ERROR, "Exactly one ASS/SSA stream is needed.\n"); | |
50 | return -1; | |
51 | } | |
52 | ass->write_ts = avctx->codec_id == AV_CODEC_ID_ASS; | |
53 | avpriv_set_pts_info(s->streams[0], 64, 1, 100); | |
54 | ||
55 | while(ass->extra_index < avctx->extradata_size){ | |
56 | uint8_t *p = avctx->extradata + ass->extra_index; | |
57 | uint8_t *end= strchr(p, '\n'); | |
58 | if(!end) end= avctx->extradata + avctx->extradata_size; | |
59 | else end++; | |
60 | ||
61 | avio_write(s->pb, p, end-p); | |
62 | ass->extra_index += end-p; | |
63 | ||
64 | if(last && !memcmp(last, "[Events]", 8)) | |
65 | break; | |
66 | last=p; | |
67 | } | |
68 | ||
69 | avio_flush(s->pb); | |
70 | ||
71 | return 0; | |
72 | } | |
73 | ||
74 | static void purge_dialogues(AVFormatContext *s, int force) | |
75 | { | |
76 | int n = 0; | |
77 | ASSContext *ass = s->priv_data; | |
78 | DialogueLine *dialogue = ass->dialogue_cache; | |
79 | ||
80 | while (dialogue && (dialogue->readorder == ass->expected_readorder || force)) { | |
81 | DialogueLine *next = dialogue->next; | |
82 | if (dialogue->readorder != ass->expected_readorder) { | |
83 | av_log(s, AV_LOG_WARNING, "ReadOrder gap found between %d and %d\n", | |
84 | ass->expected_readorder, dialogue->readorder); | |
85 | ass->expected_readorder = dialogue->readorder; | |
86 | } | |
87 | avio_printf(s->pb, "Dialogue: %s\r\n", dialogue->line); | |
88 | if (dialogue == ass->last_added_dialogue) | |
89 | ass->last_added_dialogue = next; | |
90 | av_free(dialogue->line); | |
91 | av_free(dialogue); | |
92 | if (next) | |
93 | next->prev = NULL; | |
94 | dialogue = ass->dialogue_cache = next; | |
95 | ass->expected_readorder++; | |
96 | n++; | |
97 | } | |
98 | ass->cache_size -= n; | |
99 | if (n > 1) | |
100 | av_log(s, AV_LOG_DEBUG, "wrote %d ASS lines, cached dialogues: %d, waiting for event id %d\n", | |
101 | n, ass->cache_size, ass->expected_readorder); | |
102 | } | |
103 | ||
104 | static void insert_dialogue(ASSContext *ass, DialogueLine *dialogue) | |
105 | { | |
106 | DialogueLine *cur, *next = NULL, *prev = NULL; | |
107 | ||
108 | /* from the last added to the end of the list */ | |
109 | if (ass->last_added_dialogue) { | |
110 | for (cur = ass->last_added_dialogue; cur; cur = cur->next) { | |
111 | if (cur->readorder > dialogue->readorder) | |
112 | break; | |
113 | prev = cur; | |
114 | next = cur->next; | |
115 | } | |
116 | } | |
117 | ||
118 | /* from the beginning to the last one added */ | |
119 | if (!prev) { | |
120 | next = ass->dialogue_cache; | |
121 | for (cur = next; cur != ass->last_added_dialogue; cur = cur->next) { | |
122 | if (cur->readorder > dialogue->readorder) | |
123 | break; | |
124 | prev = cur; | |
125 | next = cur->next; | |
126 | } | |
127 | } | |
128 | ||
129 | if (prev) { | |
130 | prev->next = dialogue; | |
131 | dialogue->prev = prev; | |
132 | } else { | |
133 | dialogue->prev = ass->dialogue_cache; | |
134 | ass->dialogue_cache = dialogue; | |
135 | } | |
136 | if (next) { | |
137 | next->prev = dialogue; | |
138 | dialogue->next = next; | |
139 | } | |
140 | ass->cache_size++; | |
141 | ass->last_added_dialogue = dialogue; | |
142 | } | |
143 | ||
144 | static int write_packet(AVFormatContext *s, AVPacket *pkt) | |
145 | { | |
146 | ASSContext *ass = s->priv_data; | |
147 | ||
148 | if (ass->write_ts) { | |
149 | long int layer; | |
150 | char *p = pkt->data; | |
151 | int64_t start = pkt->pts; | |
152 | int64_t end = start + pkt->duration; | |
153 | int hh1, mm1, ss1, ms1; | |
154 | int hh2, mm2, ss2, ms2; | |
155 | DialogueLine *dialogue = av_mallocz(sizeof(*dialogue)); | |
156 | ||
157 | if (!dialogue) | |
158 | return AVERROR(ENOMEM); | |
159 | ||
160 | dialogue->readorder = strtol(p, &p, 10); | |
161 | if (dialogue->readorder < ass->expected_readorder) | |
162 | av_log(s, AV_LOG_WARNING, "Unexpected ReadOrder %d\n", | |
163 | dialogue->readorder); | |
164 | if (*p == ',') | |
165 | p++; | |
166 | ||
167 | layer = strtol(p, &p, 10); | |
168 | if (*p == ',') | |
169 | p++; | |
170 | hh1 = (int)(start / 360000); mm1 = (int)(start / 6000) % 60; | |
171 | hh2 = (int)(end / 360000); mm2 = (int)(end / 6000) % 60; | |
172 | ss1 = (int)(start / 100) % 60; ms1 = (int)(start % 100); | |
173 | ss2 = (int)(end / 100) % 60; ms2 = (int)(end % 100); | |
174 | if (hh1 > 9) hh1 = 9, mm1 = 59, ss1 = 59, ms1 = 99; | |
175 | if (hh2 > 9) hh2 = 9, mm2 = 59, ss2 = 59, ms2 = 99; | |
176 | ||
177 | dialogue->line = av_asprintf("%ld,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s", | |
178 | layer, hh1, mm1, ss1, ms1, hh2, mm2, ss2, ms2, p); | |
179 | if (!dialogue->line) { | |
180 | av_free(dialogue); | |
181 | return AVERROR(ENOMEM); | |
182 | } | |
183 | insert_dialogue(ass, dialogue); | |
184 | purge_dialogues(s, 0); | |
185 | } else { | |
186 | avio_write(s->pb, pkt->data, pkt->size); | |
187 | } | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
192 | static int write_trailer(AVFormatContext *s) | |
193 | { | |
194 | ASSContext *ass = s->priv_data; | |
195 | AVCodecContext *avctx= s->streams[0]->codec; | |
196 | ||
197 | purge_dialogues(s, 1); | |
198 | avio_write(s->pb, avctx->extradata + ass->extra_index, | |
199 | avctx->extradata_size - ass->extra_index); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | AVOutputFormat ff_ass_muxer = { | |
205 | .name = "ass", | |
206 | .long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"), | |
207 | .mime_type = "text/x-ssa", | |
208 | .extensions = "ass,ssa", | |
209 | .priv_data_size = sizeof(ASSContext), | |
210 | .subtitle_codec = AV_CODEC_ID_SSA, | |
211 | .write_header = write_header, | |
212 | .write_packet = write_packet, | |
213 | .write_trailer = write_trailer, | |
214 | .flags = AVFMT_GLOBALHEADER | AVFMT_NOTIMESTAMPS | AVFMT_TS_NONSTRICT, | |
215 | }; |