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2ba45a60 DM |
1 | /* |
2 | * SSA/ASS demuxer | |
3 | * Copyright (c) 2008 Michael Niedermayer | |
f6fa7814 | 4 | * Copyright (c) 2014 Clément Bœsch |
2ba45a60 DM |
5 | * |
6 | * This file is part of FFmpeg. | |
7 | * | |
8 | * FFmpeg is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2.1 of the License, or (at your option) any later version. | |
12 | * | |
13 | * FFmpeg is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with FFmpeg; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #include <stdint.h> | |
24 | ||
25 | #include "avformat.h" | |
26 | #include "internal.h" | |
27 | #include "subtitles.h" | |
28 | #include "libavcodec/internal.h" | |
29 | #include "libavutil/bprint.h" | |
30 | ||
31 | typedef struct ASSContext { | |
32 | FFDemuxSubtitlesQueue q; | |
f6fa7814 | 33 | unsigned readorder; |
2ba45a60 DM |
34 | } ASSContext; |
35 | ||
36 | static int ass_probe(AVProbeData *p) | |
37 | { | |
38 | char buf[13]; | |
39 | FFTextReader tr; | |
40 | ff_text_init_buf(&tr, p->buf, p->buf_size); | |
41 | ||
42 | ff_text_read(&tr, buf, sizeof(buf)); | |
43 | ||
44 | if (!memcmp(buf, "[Script Info]", 13)) | |
45 | return AVPROBE_SCORE_MAX; | |
46 | ||
47 | return 0; | |
48 | } | |
49 | ||
50 | static int ass_read_close(AVFormatContext *s) | |
51 | { | |
52 | ASSContext *ass = s->priv_data; | |
53 | ff_subtitles_queue_clean(&ass->q); | |
54 | return 0; | |
55 | } | |
56 | ||
f6fa7814 DM |
57 | static int read_dialogue(ASSContext *ass, AVBPrint *dst, const uint8_t *p, |
58 | int64_t *start, int *duration) | |
2ba45a60 | 59 | { |
f6fa7814 | 60 | int pos = 0; |
2ba45a60 DM |
61 | int64_t end; |
62 | int hh1, mm1, ss1, ms1; | |
63 | int hh2, mm2, ss2, ms2; | |
64 | ||
f6fa7814 | 65 | if (sscanf(p, "Dialogue: %*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d,%n", |
2ba45a60 | 66 | &hh1, &mm1, &ss1, &ms1, |
f6fa7814 DM |
67 | &hh2, &mm2, &ss2, &ms2, &pos) >= 8 && pos > 0) { |
68 | ||
69 | /* This is not part of the sscanf itself in order to handle an actual | |
70 | * number (which would be the Layer) or the form "Marked=N" (which is | |
71 | * the old SSA field, now replaced by Layer, and will lead to Layer | |
72 | * being 0 here). */ | |
73 | const int layer = atoi(p + 10); | |
74 | ||
2ba45a60 DM |
75 | end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2; |
76 | *start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1; | |
77 | *duration = end - *start; | |
f6fa7814 DM |
78 | |
79 | av_bprint_clear(dst); | |
80 | av_bprintf(dst, "%u,%d,%s", ass->readorder++, layer, p + pos); | |
81 | ||
82 | /* right strip the buffer */ | |
83 | while (dst->len > 0 && | |
84 | dst->str[dst->len - 1] == '\r' || | |
85 | dst->str[dst->len - 1] == '\n') | |
86 | dst->str[--dst->len] = 0; | |
2ba45a60 DM |
87 | return 0; |
88 | } | |
89 | return -1; | |
90 | } | |
91 | ||
92 | static int64_t get_line(AVBPrint *buf, FFTextReader *tr) | |
93 | { | |
94 | int64_t pos = ff_text_pos(tr); | |
95 | ||
96 | av_bprint_clear(buf); | |
97 | for (;;) { | |
98 | char c = ff_text_r8(tr); | |
99 | if (!c) | |
100 | break; | |
101 | av_bprint_chars(buf, c, 1); | |
102 | if (c == '\n') | |
103 | break; | |
104 | } | |
105 | return pos; | |
106 | } | |
107 | ||
108 | static int ass_read_header(AVFormatContext *s) | |
109 | { | |
110 | ASSContext *ass = s->priv_data; | |
f6fa7814 DM |
111 | AVBPrint header, line, rline; |
112 | int res = 0; | |
2ba45a60 DM |
113 | AVStream *st; |
114 | FFTextReader tr; | |
f6fa7814 | 115 | ff_text_init_avio(s, &tr, s->pb); |
2ba45a60 DM |
116 | |
117 | st = avformat_new_stream(s, NULL); | |
118 | if (!st) | |
119 | return AVERROR(ENOMEM); | |
120 | avpriv_set_pts_info(st, 64, 1, 100); | |
121 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
f6fa7814 | 122 | st->codec->codec_id = AV_CODEC_ID_ASS; |
2ba45a60 DM |
123 | |
124 | av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED); | |
125 | av_bprint_init(&line, 0, AV_BPRINT_SIZE_UNLIMITED); | |
f6fa7814 | 126 | av_bprint_init(&rline, 0, AV_BPRINT_SIZE_UNLIMITED); |
2ba45a60 DM |
127 | |
128 | for (;;) { | |
129 | int64_t pos = get_line(&line, &tr); | |
f6fa7814 DM |
130 | int64_t ts_start = AV_NOPTS_VALUE; |
131 | int duration = -1; | |
132 | AVPacket *sub; | |
2ba45a60 DM |
133 | |
134 | if (!line.str[0]) // EOF | |
135 | break; | |
136 | ||
f6fa7814 | 137 | if (read_dialogue(ass, &rline, line.str, &ts_start, &duration) < 0) { |
2ba45a60 | 138 | av_bprintf(&header, "%s", line.str); |
f6fa7814 | 139 | continue; |
2ba45a60 | 140 | } |
f6fa7814 DM |
141 | sub = ff_subtitles_queue_insert(&ass->q, rline.str, rline.len, 0); |
142 | if (!sub) { | |
143 | res = AVERROR(ENOMEM); | |
144 | goto end; | |
145 | } | |
146 | sub->pos = pos; | |
147 | sub->pts = ts_start; | |
148 | sub->duration = duration; | |
2ba45a60 DM |
149 | } |
150 | ||
2ba45a60 DM |
151 | res = avpriv_bprint_to_extradata(st->codec, &header); |
152 | if (res < 0) | |
153 | goto end; | |
154 | ||
155 | ff_subtitles_queue_finalize(&ass->q); | |
156 | ||
157 | end: | |
f6fa7814 DM |
158 | av_bprint_finalize(&header, NULL); |
159 | av_bprint_finalize(&line, NULL); | |
160 | av_bprint_finalize(&rline, NULL); | |
2ba45a60 DM |
161 | return res; |
162 | } | |
163 | ||
164 | static int ass_read_packet(AVFormatContext *s, AVPacket *pkt) | |
165 | { | |
166 | ASSContext *ass = s->priv_data; | |
167 | return ff_subtitles_queue_read_packet(&ass->q, pkt); | |
168 | } | |
169 | ||
170 | static int ass_read_seek(AVFormatContext *s, int stream_index, | |
171 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) | |
172 | { | |
173 | ASSContext *ass = s->priv_data; | |
174 | return ff_subtitles_queue_seek(&ass->q, s, stream_index, | |
175 | min_ts, ts, max_ts, flags); | |
176 | } | |
177 | ||
178 | AVInputFormat ff_ass_demuxer = { | |
179 | .name = "ass", | |
180 | .long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"), | |
181 | .priv_data_size = sizeof(ASSContext), | |
182 | .read_probe = ass_probe, | |
183 | .read_header = ass_read_header, | |
184 | .read_packet = ass_read_packet, | |
185 | .read_close = ass_read_close, | |
186 | .read_seek2 = ass_read_seek, | |
187 | }; |