| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * TED Talks captions format decoder | ||
| 3 | * Copyright (c) 2012 Nicolas George | ||
| 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/bprint.h" | ||
| 23 | #include "libavutil/log.h" | ||
| 24 | #include "libavutil/opt.h" | ||
| 25 | #include "avformat.h" | ||
| 26 | #include "demux.h" | ||
| 27 | #include "internal.h" | ||
| 28 | #include "subtitles.h" | ||
| 29 | |||
| 30 | typedef struct { | ||
| 31 | AVClass *class; | ||
| 32 | int64_t start_time; | ||
| 33 | FFDemuxSubtitlesQueue subs; | ||
| 34 | } TEDCaptionsDemuxer; | ||
| 35 | |||
| 36 | static const AVOption tedcaptions_options[] = { | ||
| 37 | { "start_time", "set the start time (offset) of the subtitles, in ms", | ||
| 38 | offsetof(TEDCaptionsDemuxer, start_time), AV_OPT_TYPE_INT64, | ||
| 39 | { .i64 = 15000 }, INT64_MIN, INT64_MAX, | ||
| 40 | AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM }, | ||
| 41 | { NULL }, | ||
| 42 | }; | ||
| 43 | |||
| 44 | static const AVClass tedcaptions_demuxer_class = { | ||
| 45 | .class_name = "tedcaptions_demuxer", | ||
| 46 | .item_name = av_default_item_name, | ||
| 47 | .option = tedcaptions_options, | ||
| 48 | .version = LIBAVUTIL_VERSION_INT, | ||
| 49 | }; | ||
| 50 | |||
| 51 | #define BETWEEN(a, amin, amax) ((unsigned)((a) - (amin)) <= (amax) - (amin)) | ||
| 52 | |||
| 53 | #define HEX_DIGIT_TEST(c) (BETWEEN(c, '0', '9') || BETWEEN((c) | 32, 'a', 'z')) | ||
| 54 | #define HEX_DIGIT_VAL(c) ((c) <= '9' ? (c) - '0' : ((c) | 32) - 'a' + 10) | ||
| 55 | #define ERR_CODE(c) ((c) < 0 ? (c) : AVERROR_INVALIDDATA) | ||
| 56 | |||
| 57 | ✗ | static void av_bprint_utf8(AVBPrint *bp, unsigned c) | |
| 58 | { | ||
| 59 | int bytes, i; | ||
| 60 | |||
| 61 | ✗ | if (c <= 0x7F) { | |
| 62 | ✗ | av_bprint_chars(bp, c, 1); | |
| 63 | ✗ | return; | |
| 64 | } | ||
| 65 | ✗ | bytes = (av_log2(c) - 2) / 5; | |
| 66 | ✗ | av_bprint_chars(bp, (c >> (bytes * 6)) | ((0xFF80 >> bytes) & 0xFF), 1); | |
| 67 | ✗ | for (i = bytes - 1; i >= 0; i--) | |
| 68 | ✗ | av_bprint_chars(bp, ((c >> (i * 6)) & 0x3F) | 0x80, 1); | |
| 69 | } | ||
| 70 | |||
| 71 | ✗ | static void next_byte(AVIOContext *pb, int *cur_byte) | |
| 72 | { | ||
| 73 | uint8_t b; | ||
| 74 | ✗ | int ret = avio_read(pb, &b, 1); | |
| 75 | ✗ | *cur_byte = ret > 0 ? b : ret == 0 ? AVERROR_EOF : ret; | |
| 76 | ✗ | } | |
| 77 | |||
| 78 | ✗ | static void skip_spaces(AVIOContext *pb, int *cur_byte) | |
| 79 | { | ||
| 80 | ✗ | while (*cur_byte == ' ' || *cur_byte == '\t' || | |
| 81 | ✗ | *cur_byte == '\n' || *cur_byte == '\r') | |
| 82 | ✗ | next_byte(pb, cur_byte); | |
| 83 | ✗ | } | |
| 84 | |||
| 85 | ✗ | static int expect_byte(AVIOContext *pb, int *cur_byte, uint8_t c) | |
| 86 | { | ||
| 87 | ✗ | skip_spaces(pb, cur_byte); | |
| 88 | ✗ | if (*cur_byte != c) | |
| 89 | ✗ | return ERR_CODE(*cur_byte); | |
| 90 | ✗ | next_byte(pb, cur_byte); | |
| 91 | ✗ | return 0; | |
| 92 | } | ||
| 93 | |||
| 94 | ✗ | static int parse_string(AVIOContext *pb, int *cur_byte, AVBPrint *bp, int full) | |
| 95 | { | ||
| 96 | int ret; | ||
| 97 | |||
| 98 | ✗ | ret = expect_byte(pb, cur_byte, '"'); | |
| 99 | ✗ | if (ret < 0) | |
| 100 | ✗ | return ret; | |
| 101 | ✗ | while (*cur_byte > 0 && *cur_byte != '"') { | |
| 102 | ✗ | if (*cur_byte == '\\') { | |
| 103 | ✗ | next_byte(pb, cur_byte); | |
| 104 | ✗ | if (*cur_byte < 0) | |
| 105 | ✗ | return AVERROR_INVALIDDATA; | |
| 106 | ✗ | if ((*cur_byte | 32) == 'u') { | |
| 107 | ✗ | unsigned chr = 0, i; | |
| 108 | ✗ | for (i = 0; i < 4; i++) { | |
| 109 | ✗ | next_byte(pb, cur_byte); | |
| 110 | ✗ | if (!HEX_DIGIT_TEST(*cur_byte)) | |
| 111 | ✗ | return ERR_CODE(*cur_byte); | |
| 112 | ✗ | chr = chr * 16 + HEX_DIGIT_VAL(*cur_byte); | |
| 113 | } | ||
| 114 | ✗ | av_bprint_utf8(bp, chr); | |
| 115 | } else { | ||
| 116 | ✗ | av_bprint_chars(bp, *cur_byte, 1); | |
| 117 | } | ||
| 118 | } else { | ||
| 119 | ✗ | av_bprint_chars(bp, *cur_byte, 1); | |
| 120 | } | ||
| 121 | ✗ | next_byte(pb, cur_byte); | |
| 122 | } | ||
| 123 | ✗ | ret = expect_byte(pb, cur_byte, '"'); | |
| 124 | ✗ | if (ret < 0) | |
| 125 | ✗ | return ret; | |
| 126 | ✗ | if (full && !av_bprint_is_complete(bp)) | |
| 127 | ✗ | return AVERROR(ENOMEM); | |
| 128 | |||
| 129 | ✗ | return 0; | |
| 130 | } | ||
| 131 | |||
| 132 | ✗ | static int parse_label(AVIOContext *pb, int *cur_byte, AVBPrint *bp) | |
| 133 | { | ||
| 134 | int ret; | ||
| 135 | |||
| 136 | ✗ | av_bprint_init(bp, 0, AV_BPRINT_SIZE_AUTOMATIC); | |
| 137 | ✗ | ret = parse_string(pb, cur_byte, bp, 0); | |
| 138 | ✗ | if (ret < 0) | |
| 139 | ✗ | return ret; | |
| 140 | ✗ | ret = expect_byte(pb, cur_byte, ':'); | |
| 141 | ✗ | if (ret < 0) | |
| 142 | ✗ | return ret; | |
| 143 | ✗ | return 0; | |
| 144 | } | ||
| 145 | |||
| 146 | ✗ | static int parse_boolean(AVIOContext *pb, int *cur_byte, int *result) | |
| 147 | { | ||
| 148 | static const char * const text[] = { "false", "true" }; | ||
| 149 | const char *p; | ||
| 150 | int i; | ||
| 151 | |||
| 152 | ✗ | skip_spaces(pb, cur_byte); | |
| 153 | ✗ | for (i = 0; i < 2; i++) { | |
| 154 | ✗ | p = text[i]; | |
| 155 | ✗ | if (*cur_byte != *p) | |
| 156 | ✗ | continue; | |
| 157 | ✗ | for (; *p; p++, next_byte(pb, cur_byte)) | |
| 158 | ✗ | if (*cur_byte != *p) | |
| 159 | ✗ | return AVERROR_INVALIDDATA; | |
| 160 | ✗ | if (BETWEEN(*cur_byte | 32, 'a', 'z')) | |
| 161 | ✗ | return AVERROR_INVALIDDATA; | |
| 162 | ✗ | *result = i; | |
| 163 | ✗ | return 0; | |
| 164 | } | ||
| 165 | ✗ | return AVERROR_INVALIDDATA; | |
| 166 | } | ||
| 167 | |||
| 168 | ✗ | static int parse_int(AVIOContext *pb, int *cur_byte, int64_t *result) | |
| 169 | { | ||
| 170 | ✗ | int64_t val = 0; | |
| 171 | |||
| 172 | ✗ | skip_spaces(pb, cur_byte); | |
| 173 | ✗ | if ((unsigned)*cur_byte - '0' > 9) | |
| 174 | ✗ | return AVERROR_INVALIDDATA; | |
| 175 | ✗ | while (BETWEEN(*cur_byte, '0', '9')) { | |
| 176 | ✗ | if (val > INT_MAX/10 - (*cur_byte - '0')) | |
| 177 | ✗ | return AVERROR_INVALIDDATA; | |
| 178 | ✗ | val = val * 10 + (*cur_byte - '0'); | |
| 179 | ✗ | next_byte(pb, cur_byte); | |
| 180 | } | ||
| 181 | ✗ | *result = val; | |
| 182 | ✗ | return 0; | |
| 183 | } | ||
| 184 | |||
| 185 | ✗ | static int parse_file(AVIOContext *pb, FFDemuxSubtitlesQueue *subs) | |
| 186 | { | ||
| 187 | int ret, cur_byte, start_of_par; | ||
| 188 | AVBPrint label, content; | ||
| 189 | int64_t pos, start, duration; | ||
| 190 | AVPacket *pkt; | ||
| 191 | |||
| 192 | ✗ | av_bprint_init(&content, 0, AV_BPRINT_SIZE_UNLIMITED); | |
| 193 | |||
| 194 | ✗ | next_byte(pb, &cur_byte); | |
| 195 | ✗ | ret = expect_byte(pb, &cur_byte, '{'); | |
| 196 | ✗ | if (ret < 0) | |
| 197 | ✗ | return AVERROR_INVALIDDATA; | |
| 198 | ✗ | ret = parse_label(pb, &cur_byte, &label); | |
| 199 | ✗ | if (ret < 0 || strcmp(label.str, "captions")) | |
| 200 | ✗ | return AVERROR_INVALIDDATA; | |
| 201 | ✗ | ret = expect_byte(pb, &cur_byte, '['); | |
| 202 | ✗ | if (ret < 0) | |
| 203 | ✗ | return AVERROR_INVALIDDATA; | |
| 204 | while (1) { | ||
| 205 | ✗ | start = duration = AV_NOPTS_VALUE; | |
| 206 | ✗ | ret = expect_byte(pb, &cur_byte, '{'); | |
| 207 | ✗ | if (ret < 0) | |
| 208 | ✗ | goto fail; | |
| 209 | ✗ | pos = avio_tell(pb) - 1; | |
| 210 | while (1) { | ||
| 211 | ✗ | ret = parse_label(pb, &cur_byte, &label); | |
| 212 | ✗ | if (ret < 0) | |
| 213 | ✗ | goto fail; | |
| 214 | ✗ | if (!strcmp(label.str, "startOfParagraph")) { | |
| 215 | ✗ | ret = parse_boolean(pb, &cur_byte, &start_of_par); | |
| 216 | ✗ | if (ret < 0) | |
| 217 | ✗ | goto fail; | |
| 218 | ✗ | } else if (!strcmp(label.str, "content")) { | |
| 219 | ✗ | ret = parse_string(pb, &cur_byte, &content, 1); | |
| 220 | ✗ | if (ret < 0) | |
| 221 | ✗ | goto fail; | |
| 222 | ✗ | } else if (!strcmp(label.str, "startTime")) { | |
| 223 | ✗ | ret = parse_int(pb, &cur_byte, &start); | |
| 224 | ✗ | if (ret < 0) | |
| 225 | ✗ | goto fail; | |
| 226 | ✗ | } else if (!strcmp(label.str, "duration")) { | |
| 227 | ✗ | ret = parse_int(pb, &cur_byte, &duration); | |
| 228 | ✗ | if (ret < 0) | |
| 229 | ✗ | goto fail; | |
| 230 | } else { | ||
| 231 | ✗ | ret = AVERROR_INVALIDDATA; | |
| 232 | ✗ | goto fail; | |
| 233 | } | ||
| 234 | ✗ | skip_spaces(pb, &cur_byte); | |
| 235 | ✗ | if (cur_byte != ',') | |
| 236 | ✗ | break; | |
| 237 | ✗ | next_byte(pb, &cur_byte); | |
| 238 | } | ||
| 239 | ✗ | ret = expect_byte(pb, &cur_byte, '}'); | |
| 240 | ✗ | if (ret < 0) | |
| 241 | ✗ | goto fail; | |
| 242 | |||
| 243 | ✗ | if (!content.size || start == AV_NOPTS_VALUE || | |
| 244 | ✗ | duration == AV_NOPTS_VALUE) { | |
| 245 | ✗ | ret = AVERROR_INVALIDDATA; | |
| 246 | ✗ | goto fail; | |
| 247 | } | ||
| 248 | ✗ | pkt = ff_subtitles_queue_insert_bprint(subs, &content, 0); | |
| 249 | ✗ | if (!pkt) { | |
| 250 | ✗ | ret = AVERROR(ENOMEM); | |
| 251 | ✗ | goto fail; | |
| 252 | } | ||
| 253 | ✗ | pkt->pos = pos; | |
| 254 | ✗ | pkt->pts = start; | |
| 255 | ✗ | pkt->duration = duration; | |
| 256 | ✗ | av_bprint_clear(&content); | |
| 257 | |||
| 258 | ✗ | skip_spaces(pb, &cur_byte); | |
| 259 | ✗ | if (cur_byte != ',') | |
| 260 | ✗ | break; | |
| 261 | ✗ | next_byte(pb, &cur_byte); | |
| 262 | } | ||
| 263 | ✗ | ret = expect_byte(pb, &cur_byte, ']'); | |
| 264 | ✗ | if (ret < 0) | |
| 265 | ✗ | goto fail; | |
| 266 | ✗ | ret = expect_byte(pb, &cur_byte, '}'); | |
| 267 | ✗ | if (ret < 0) | |
| 268 | ✗ | goto fail; | |
| 269 | ✗ | skip_spaces(pb, &cur_byte); | |
| 270 | ✗ | if (cur_byte != AVERROR_EOF) | |
| 271 | ✗ | ret = ERR_CODE(cur_byte); | |
| 272 | ✗ | fail: | |
| 273 | ✗ | av_bprint_finalize(&content, NULL); | |
| 274 | ✗ | return ret; | |
| 275 | } | ||
| 276 | |||
| 277 | ✗ | static av_cold int tedcaptions_read_header(AVFormatContext *avf) | |
| 278 | { | ||
| 279 | ✗ | TEDCaptionsDemuxer *tc = avf->priv_data; | |
| 280 | ✗ | AVStream *st = avformat_new_stream(avf, NULL); | |
| 281 | FFStream *sti; | ||
| 282 | int ret, i; | ||
| 283 | AVPacket *last; | ||
| 284 | |||
| 285 | ✗ | if (!st) | |
| 286 | ✗ | return AVERROR(ENOMEM); | |
| 287 | |||
| 288 | ✗ | sti = ffstream(st); | |
| 289 | ✗ | ret = parse_file(avf->pb, &tc->subs); | |
| 290 | ✗ | if (ret < 0) { | |
| 291 | ✗ | if (ret == AVERROR_INVALIDDATA) | |
| 292 | ✗ | av_log(avf, AV_LOG_ERROR, "Syntax error near offset %"PRId64".\n", | |
| 293 | avio_tell(avf->pb)); | ||
| 294 | ✗ | return ret; | |
| 295 | } | ||
| 296 | ✗ | ff_subtitles_queue_finalize(avf, &tc->subs); | |
| 297 | ✗ | for (i = 0; i < tc->subs.nb_subs; i++) | |
| 298 | ✗ | tc->subs.subs[i]->pts += tc->start_time; | |
| 299 | |||
| 300 | ✗ | last = tc->subs.subs[tc->subs.nb_subs - 1]; | |
| 301 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
| 302 | ✗ | st->codecpar->codec_id = AV_CODEC_ID_TEXT; | |
| 303 | ✗ | avpriv_set_pts_info(st, 64, 1, 1000); | |
| 304 | ✗ | sti->probe_packets = 0; | |
| 305 | ✗ | st->start_time = 0; | |
| 306 | ✗ | st->duration = last->pts + last->duration; | |
| 307 | ✗ | sti->cur_dts = 0; | |
| 308 | |||
| 309 | ✗ | return 0; | |
| 310 | } | ||
| 311 | |||
| 312 | ✗ | static int tedcaptions_read_packet(AVFormatContext *avf, AVPacket *packet) | |
| 313 | { | ||
| 314 | ✗ | TEDCaptionsDemuxer *tc = avf->priv_data; | |
| 315 | |||
| 316 | ✗ | return ff_subtitles_queue_read_packet(&tc->subs, packet); | |
| 317 | } | ||
| 318 | |||
| 319 | ✗ | static int tedcaptions_read_close(AVFormatContext *avf) | |
| 320 | { | ||
| 321 | ✗ | TEDCaptionsDemuxer *tc = avf->priv_data; | |
| 322 | |||
| 323 | ✗ | ff_subtitles_queue_clean(&tc->subs); | |
| 324 | ✗ | return 0; | |
| 325 | } | ||
| 326 | |||
| 327 | 7186 | static av_cold int tedcaptions_read_probe(const AVProbeData *p) | |
| 328 | { | ||
| 329 | static const char *const tags[] = { | ||
| 330 | "\"captions\"", "\"duration\"", "\"content\"", | ||
| 331 | "\"startOfParagraph\"", "\"startTime\"", | ||
| 332 | }; | ||
| 333 | 7186 | unsigned i, count = 0; | |
| 334 | const char *t; | ||
| 335 | |||
| 336 |
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7186 | if (p->buf[strspn(p->buf, " \t\r\n")] != '{') |
| 337 | 7183 | return 0; | |
| 338 |
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18 | for (i = 0; i < FF_ARRAY_ELEMS(tags); i++) { |
| 339 |
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15 | if (!(t = strstr(p->buf, tags[i]))) |
| 340 | 15 | continue; | |
| 341 | ✗ | t += strlen(tags[i]); | |
| 342 | ✗ | t += strspn(t, " \t\r\n"); | |
| 343 | ✗ | if (*t == ':') | |
| 344 | ✗ | count++; | |
| 345 | } | ||
| 346 |
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6 | return count == FF_ARRAY_ELEMS(tags) ? AVPROBE_SCORE_MAX : |
| 347 |
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3 | count ? AVPROBE_SCORE_EXTENSION : 0; |
| 348 | } | ||
| 349 | |||
| 350 | ✗ | static int tedcaptions_read_seek(AVFormatContext *avf, int stream_index, | |
| 351 | int64_t min_ts, int64_t ts, int64_t max_ts, | ||
| 352 | int flags) | ||
| 353 | { | ||
| 354 | ✗ | TEDCaptionsDemuxer *tc = avf->priv_data; | |
| 355 | ✗ | return ff_subtitles_queue_seek(&tc->subs, avf, stream_index, | |
| 356 | min_ts, ts, max_ts, flags); | ||
| 357 | } | ||
| 358 | |||
| 359 | const FFInputFormat ff_tedcaptions_demuxer = { | ||
| 360 | .p.name = "tedcaptions", | ||
| 361 | .p.long_name = NULL_IF_CONFIG_SMALL("TED Talks captions"), | ||
| 362 | .p.priv_class = &tedcaptions_demuxer_class, | ||
| 363 | .priv_data_size = sizeof(TEDCaptionsDemuxer), | ||
| 364 | .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP, | ||
| 365 | .read_header = tedcaptions_read_header, | ||
| 366 | .read_packet = tedcaptions_read_packet, | ||
| 367 | .read_close = tedcaptions_read_close, | ||
| 368 | .read_probe = tedcaptions_read_probe, | ||
| 369 | .read_seek2 = tedcaptions_read_seek, | ||
| 370 | }; | ||
| 371 |