| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * SubRip subtitle demuxer | ||
| 3 | * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> | ||
| 4 | * Copyright (c) 2015 Clément Bœsch <u pkh me> | ||
| 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 "avformat.h" | ||
| 24 | #include "demux.h" | ||
| 25 | #include "internal.h" | ||
| 26 | #include "subtitles.h" | ||
| 27 | #include "libavutil/bprint.h" | ||
| 28 | #include "libavutil/intreadwrite.h" | ||
| 29 | |||
| 30 | typedef struct { | ||
| 31 | FFDemuxSubtitlesQueue q; | ||
| 32 | } SRTContext; | ||
| 33 | |||
| 34 | 7279 | static int srt_probe(const AVProbeData *p) | |
| 35 | { | ||
| 36 | int v; | ||
| 37 | char buf[64], *pbuf; | ||
| 38 | FFTextReader tr; | ||
| 39 | |||
| 40 | 7279 | ff_text_init_buf(&tr, p->buf, p->buf_size); | |
| 41 | |||
| 42 |
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7286 | while (ff_text_peek_r8(&tr) == '\r' || ff_text_peek_r8(&tr) == '\n') |
| 43 | 7 | ff_text_r8(&tr); | |
| 44 | |||
| 45 | /* Check if the first non-empty line is a number. We do not check what the | ||
| 46 | * number is because in practice it can be anything. | ||
| 47 | * Also, that number can be followed by random garbage, so we can not | ||
| 48 | * unfortunately check that we only have a number. */ | ||
| 49 |
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8845 | if (ff_subtitles_read_line(&tr, buf, sizeof(buf)) < 0 || |
| 50 |
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3132 | strtol(buf, &pbuf, 10) < 0 || pbuf == buf) |
| 51 | 7269 | return 0; | |
| 52 | |||
| 53 | /* Check if the next line matches a SRT timestamp */ | ||
| 54 |
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10 | if (ff_subtitles_read_line(&tr, buf, sizeof(buf)) < 0) |
| 55 | ✗ | return 0; | |
| 56 | 10 | pbuf = buf; | |
| 57 |
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10 | if (buf[0] == '-') |
| 58 | ✗ | pbuf++; | |
| 59 |
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10 | if (pbuf[0] >= '0' && pbuf[0] <= '9' && strstr(buf, " --> ") |
| 60 |
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8 | && sscanf(buf, "%*d:%*d:%*d%*1[,.]%*d --> %*d:%*d:%*d%*1[,.]%d", &v) == 1) |
| 61 | 8 | return AVPROBE_SCORE_MAX; | |
| 62 | |||
| 63 | 2 | return 0; | |
| 64 | } | ||
| 65 | |||
| 66 | struct event_info { | ||
| 67 | int32_t x1, x2, y1, y2; | ||
| 68 | int duration; | ||
| 69 | int64_t pts; | ||
| 70 | int64_t pos; | ||
| 71 | }; | ||
| 72 | |||
| 73 | 3156 | static int get_event_info(const char *line, struct event_info *ei) | |
| 74 | { | ||
| 75 | int hh1, mm1, ss1, ms1; | ||
| 76 | int hh2, mm2, ss2, ms2; | ||
| 77 | |||
| 78 | 3156 | ei->x1 = ei->x2 = ei->y1 = ei->y2 = ei->duration = -1; | |
| 79 | 3156 | ei->pts = AV_NOPTS_VALUE; | |
| 80 | 3156 | ei->pos = -1; | |
| 81 |
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3156 | if (sscanf(line, "%d:%d:%d%*1[,.]%d --> %d:%d:%d%*1[,.]%d" |
| 82 | "%*[ ]X1:%"PRId32" X2:%"PRId32" Y1:%"PRId32" Y2:%"PRId32, | ||
| 83 | &hh1, &mm1, &ss1, &ms1, | ||
| 84 | &hh2, &mm2, &ss2, &ms2, | ||
| 85 | &ei->x1, &ei->x2, &ei->y1, &ei->y2) >= 8) { | ||
| 86 | 774 | const int64_t start = (hh1*3600LL + mm1*60LL + ss1) * 1000LL + ms1; | |
| 87 | 774 | const int64_t end = (hh2*3600LL + mm2*60LL + ss2) * 1000LL + ms2; | |
| 88 | 774 | ei->duration = end - start; | |
| 89 | 774 | ei->pts = start; | |
| 90 | 774 | return 0; | |
| 91 | } | ||
| 92 | 2382 | return -1; | |
| 93 | } | ||
| 94 | |||
| 95 | 774 | static int add_event(FFDemuxSubtitlesQueue *q, AVBPrint *buf, char *line_cache, | |
| 96 | const struct event_info *ei, int append_cache) | ||
| 97 | { | ||
| 98 |
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774 | if (append_cache && line_cache[0]) |
| 99 | 2 | av_bprintf(buf, "%s\n", line_cache); | |
| 100 | 774 | line_cache[0] = 0; | |
| 101 |
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774 | if (!av_bprint_is_complete(buf)) |
| 102 | ✗ | return AVERROR(ENOMEM); | |
| 103 | |||
| 104 |
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1544 | while (buf->len > 0 && buf->str[buf->len - 1] == '\n') |
| 105 | 770 | buf->str[--buf->len] = 0; | |
| 106 | |||
| 107 |
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774 | if (buf->len) { |
| 108 | 770 | AVPacket *sub = ff_subtitles_queue_insert_bprint(q, buf, 0); | |
| 109 |
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770 | if (!sub) |
| 110 | ✗ | return AVERROR(ENOMEM); | |
| 111 | 770 | av_bprint_clear(buf); | |
| 112 | 770 | sub->pos = ei->pos; | |
| 113 | 770 | sub->pts = ei->pts; | |
| 114 | 770 | sub->duration = ei->duration; | |
| 115 |
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770 | if (ei->x1 != -1) { |
| 116 | 8 | uint8_t *p = av_packet_new_side_data(sub, AV_PKT_DATA_SUBTITLE_POSITION, 16); | |
| 117 |
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8 | if (p) { |
| 118 | 8 | AV_WL32(p, ei->x1); | |
| 119 | 8 | AV_WL32(p + 4, ei->y1); | |
| 120 | 8 | AV_WL32(p + 8, ei->x2); | |
| 121 | 8 | AV_WL32(p + 12, ei->y2); | |
| 122 | } | ||
| 123 | } | ||
| 124 | } | ||
| 125 | |||
| 126 | 774 | return 0; | |
| 127 | } | ||
| 128 | |||
| 129 | 12 | static int srt_read_header(AVFormatContext *s) | |
| 130 | { | ||
| 131 | 12 | SRTContext *srt = s->priv_data; | |
| 132 | AVBPrint buf; | ||
| 133 | 12 | AVStream *st = avformat_new_stream(s, NULL); | |
| 134 | 12 | int res = 0; | |
| 135 | char line[4096], line_cache[4096]; | ||
| 136 | 12 | int has_event_info = 0; | |
| 137 | struct event_info ei; | ||
| 138 | FFTextReader tr; | ||
| 139 | 12 | ff_text_init_avio(s, &tr, s->pb); | |
| 140 | |||
| 141 |
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12 | if (!st) |
| 142 | ✗ | return AVERROR(ENOMEM); | |
| 143 | 12 | avpriv_set_pts_info(st, 64, 1, 1000); | |
| 144 | 12 | st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
| 145 | 12 | st->codecpar->codec_id = AV_CODEC_ID_SUBRIP; | |
| 146 | |||
| 147 | 12 | av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); | |
| 148 | |||
| 149 | 12 | line_cache[0] = 0; | |
| 150 | |||
| 151 |
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3967 | while (!ff_text_eof(&tr)) { |
| 152 | struct event_info tmp_ei; | ||
| 153 | 3955 | const int64_t pos = ff_text_pos(&tr); | |
| 154 | 3955 | ptrdiff_t len = ff_subtitles_read_line(&tr, line, sizeof(line)); | |
| 155 | |||
| 156 |
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3955 | if (len < 0) |
| 157 | ✗ | break; | |
| 158 | |||
| 159 |
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3955 | if (!len || !line[0]) |
| 160 | 811 | continue; | |
| 161 | |||
| 162 |
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3156 | if (get_event_info(line, &tmp_ei) < 0) { |
| 163 | char *pline; | ||
| 164 | |||
| 165 |
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2382 | if (!has_event_info) |
| 166 | 12 | continue; | |
| 167 | |||
| 168 |
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2370 | if (line_cache[0]) { |
| 169 | /* We got some cache and a new line so we assume the cached | ||
| 170 | * line was actually part of the payload */ | ||
| 171 | 21 | av_bprintf(&buf, "%s\n", line_cache); | |
| 172 | 21 | line_cache[0] = 0; | |
| 173 | } | ||
| 174 | |||
| 175 | /* If the line doesn't start with a number, we assume it's part of | ||
| 176 | * the payload, otherwise is likely an event number preceding the | ||
| 177 | * timing information... but we can't be sure of this yet, so we | ||
| 178 | * cache it */ | ||
| 179 |
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2370 | if (strtol(line, &pline, 10) < 0 || line == pline) |
| 180 | 1587 | av_bprintf(&buf, "%s\n", line); | |
| 181 | else | ||
| 182 | 783 | strcpy(line_cache, line); | |
| 183 | } else { | ||
| 184 |
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774 | if (has_event_info) { |
| 185 | /* We have the information of previous event, append it to the | ||
| 186 | * queue. We insert the cached line if and only if the payload | ||
| 187 | * is empty and the cached line is not a standalone number. */ | ||
| 188 | 762 | char *pline = NULL; | |
| 189 |
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762 | const int standalone_number = strtol(line_cache, &pline, 10) >= 0 && pline && !*pline; |
| 190 |
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762 | res = add_event(&srt->q, &buf, line_cache, &ei, !buf.len && !standalone_number); |
| 191 |
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762 | if (res < 0) |
| 192 | ✗ | goto end; | |
| 193 | } else { | ||
| 194 | 12 | has_event_info = 1; | |
| 195 | } | ||
| 196 | 774 | tmp_ei.pos = pos; | |
| 197 | 774 | ei = tmp_ei; | |
| 198 | } | ||
| 199 | } | ||
| 200 | |||
| 201 | /* Append the last event. Here we force the cache to be flushed, because a | ||
| 202 | * trailing number is more likely to be genuine (for example a copyright | ||
| 203 | * date) and not the event index of an inexistent event */ | ||
| 204 |
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12 | if (has_event_info) { |
| 205 | 12 | res = add_event(&srt->q, &buf, line_cache, &ei, 1); | |
| 206 |
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12 | if (res < 0) |
| 207 | ✗ | goto end; | |
| 208 | } | ||
| 209 | |||
| 210 | 12 | ff_subtitles_queue_finalize(s, &srt->q); | |
| 211 | |||
| 212 | 12 | end: | |
| 213 | 12 | av_bprint_finalize(&buf, NULL); | |
| 214 | 12 | return res; | |
| 215 | } | ||
| 216 | |||
| 217 | const FFInputFormat ff_srt_demuxer = { | ||
| 218 | .p.name = "srt", | ||
| 219 | .p.long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), | ||
| 220 | .priv_data_size = sizeof(SRTContext), | ||
| 221 | .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP, | ||
| 222 | .read_probe = srt_probe, | ||
| 223 | .read_header = srt_read_header, | ||
| 224 | .read_packet = ff_subtitles_read_packet, | ||
| 225 | .read_seek2 = ff_subtitles_read_seek, | ||
| 226 | .read_close = ff_subtitles_read_close, | ||
| 227 | }; | ||
| 228 |