1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/*
* SSA/ASS muxer
* Copyright (c) 2008 Michael Niedermayer
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avstring.h"
#include "avformat.h"
#include "internal.h"
#include "libavutil/opt.h"
typedef struct DialogueLine {
int readorder;
char *line;
struct DialogueLine *prev, *next;
} DialogueLine;
typedef struct ASSContext {
const AVClass *class;
int expected_readorder;
DialogueLine *dialogue_cache;
DialogueLine *last_added_dialogue;
int cache_size;
int ssa_mode;
int ignore_readorder;
uint8_t *trailer;
size_t trailer_size;
} ASSContext;
static int write_header(AVFormatContext *s)
{
ASSContext *ass = s->priv_data;
AVCodecParameters *par = s->streams[0]->codecpar;
if (s->nb_streams != 1 || par->codec_id != AV_CODEC_ID_ASS) {
av_log(s, AV_LOG_ERROR, "Exactly one ASS/SSA stream is needed.\n");
return AVERROR(EINVAL);
}
avpriv_set_pts_info(s->streams[0], 64, 1, 100);
if (par->extradata_size > 0) {
size_t header_size = par->extradata_size;
uint8_t *trailer = strstr(par->extradata, "\n[Events]");
if (trailer)
trailer = strstr(trailer, "Format:");
if (trailer)
trailer = strstr(trailer, "\n");
if (trailer++) {
header_size = (trailer - par->extradata);
ass->trailer_size = par->extradata_size - header_size;
if (ass->trailer_size)
ass->trailer = trailer;
}
avio_write(s->pb, par->extradata, header_size);
if (par->extradata[header_size - 1] != '\n')
avio_write(s->pb, "\r\n", 2);
ass->ssa_mode = !strstr(par->extradata, "\n[V4+ Styles]");
if (!strstr(par->extradata, "\n[Events]"))
avio_printf(s->pb, "[Events]\r\nFormat: %s, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\r\n",
ass->ssa_mode ? "Marked" : "Layer");
}
return 0;
}
static void purge_dialogues(AVFormatContext *s, int force)
{
int n = 0;
ASSContext *ass = s->priv_data;
DialogueLine *dialogue = ass->dialogue_cache;
while (dialogue && (dialogue->readorder == ass->expected_readorder || force)) {
DialogueLine *next = dialogue->next;
if (dialogue->readorder != ass->expected_readorder) {
av_log(s, AV_LOG_WARNING, "ReadOrder gap found between %d and %d\n",
ass->expected_readorder, dialogue->readorder);
ass->expected_readorder = dialogue->readorder;
}
avio_print(s->pb, "Dialogue: ", dialogue->line, "\r\n");
if (dialogue == ass->last_added_dialogue)
ass->last_added_dialogue = next;
av_freep(&dialogue->line);
av_free(dialogue);
if (next)
next->prev = NULL;
dialogue = ass->dialogue_cache = next;
ass->expected_readorder++;
n++;
}
ass->cache_size -= n;
if (n > 1)
av_log(s, AV_LOG_DEBUG, "wrote %d ASS lines, cached dialogues: %d, waiting for event id %d\n",
n, ass->cache_size, ass->expected_readorder);
}
static void insert_dialogue(ASSContext *ass, DialogueLine *dialogue)
{
DialogueLine *cur, *next = NULL, *prev = NULL;
/* from the last added to the end of the list */
if (ass->last_added_dialogue) {
for (cur = ass->last_added_dialogue; cur; cur = cur->next) {
if (cur->readorder > dialogue->readorder)
break;
prev = cur;
next = cur->next;
}
}
/* from the beginning to the last one added */
if (!prev) {
next = ass->dialogue_cache;
for (cur = next; cur != ass->last_added_dialogue; cur = cur->next) {
if (cur->readorder > dialogue->readorder)
break;
prev = cur;
next = cur->next;
}
}
if (prev) {
prev->next = dialogue;
dialogue->prev = prev;
} else {
dialogue->prev = ass->dialogue_cache;
ass->dialogue_cache = dialogue;
}
if (next) {
next->prev = dialogue;
dialogue->next = next;
}
ass->cache_size++;
ass->last_added_dialogue = dialogue;
}
static int write_packet(AVFormatContext *s, AVPacket *pkt)
{
ASSContext *ass = s->priv_data;
long int layer;
char *p = pkt->data;
int64_t start = pkt->pts;
int64_t end = start + pkt->duration;
int hh1, mm1, ss1, ms1;
int hh2, mm2, ss2, ms2;
DialogueLine *dialogue = av_mallocz(sizeof(*dialogue));
if (!dialogue)
return AVERROR(ENOMEM);
dialogue->readorder = strtol(p, &p, 10);
if (dialogue->readorder < ass->expected_readorder)
av_log(s, AV_LOG_WARNING, "Unexpected ReadOrder %d\n",
dialogue->readorder);
if (*p == ',')
p++;
if (ass->ssa_mode && !strncmp(p, "Marked=", 7))
p += 7;
layer = strtol(p, &p, 10);
if (*p == ',')
p++;
hh1 = (int)(start / 360000); mm1 = (int)(start / 6000) % 60;
hh2 = (int)(end / 360000); mm2 = (int)(end / 6000) % 60;
ss1 = (int)(start / 100) % 60; ms1 = (int)(start % 100);
ss2 = (int)(end / 100) % 60; ms2 = (int)(end % 100);
if (hh1 > 9) hh1 = 9, mm1 = 59, ss1 = 59, ms1 = 99;
if (hh2 > 9) hh2 = 9, mm2 = 59, ss2 = 59, ms2 = 99;
dialogue->line = av_asprintf("%s%ld,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s",
ass->ssa_mode ? "Marked=" : "",
layer, hh1, mm1, ss1, ms1, hh2, mm2, ss2, ms2, p);
if (!dialogue->line) {
av_free(dialogue);
return AVERROR(ENOMEM);
}
insert_dialogue(ass, dialogue);
purge_dialogues(s, ass->ignore_readorder);
return 0;
}
static int write_trailer(AVFormatContext *s)
{
ASSContext *ass = s->priv_data;
purge_dialogues(s, 1);
if (ass->trailer) {
avio_write(s->pb, ass->trailer, ass->trailer_size);
}
return 0;
}
#define OFFSET(x) offsetof(ASSContext, x)
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "ignore_readorder", "write events immediately, even if they're out-of-order", OFFSET(ignore_readorder), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
{ NULL },
};
static const AVClass ass_class = {
.class_name = "ass muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const AVOutputFormat ff_ass_muxer = {
.name = "ass",
.long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
.mime_type = "text/x-ass",
.extensions = "ass,ssa",
.priv_data_size = sizeof(ASSContext),
.subtitle_codec = AV_CODEC_ID_ASS,
.write_header = write_header,
.write_packet = write_packet,
.write_trailer = write_trailer,
.flags = AVFMT_GLOBALHEADER | AVFMT_NOTIMESTAMPS | AVFMT_TS_NONSTRICT,
.priv_class = &ass_class,
};
|
