| 1 | /* |
| 2 | * Copyright (c) 2012 Nicolas George |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 6 | * FFmpeg is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public License |
| 8 | * as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * FFmpeg is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public License |
| 17 | * along with FFmpeg; if not, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | #include "libavutil/avassert.h" |
| 22 | #include "libavutil/avstring.h" |
| 23 | #include "libavutil/intreadwrite.h" |
| 24 | #include "libavutil/opt.h" |
| 25 | #include "libavutil/parseutils.h" |
| 26 | #include "libavutil/timestamp.h" |
| 27 | #include "avformat.h" |
| 28 | #include "internal.h" |
| 29 | #include "url.h" |
| 30 | |
| 31 | typedef enum ConcatMatchMode { |
| 32 | MATCH_ONE_TO_ONE, |
| 33 | MATCH_EXACT_ID, |
| 34 | } ConcatMatchMode; |
| 35 | |
| 36 | typedef struct ConcatStream { |
| 37 | AVBitStreamFilterContext *bsf; |
| 38 | int out_stream_index; |
| 39 | } ConcatStream; |
| 40 | |
| 41 | typedef struct { |
| 42 | char *url; |
| 43 | int64_t start_time; |
| 44 | int64_t duration; |
| 45 | ConcatStream *streams; |
| 46 | int nb_streams; |
| 47 | } ConcatFile; |
| 48 | |
| 49 | typedef struct { |
| 50 | AVClass *class; |
| 51 | ConcatFile *files; |
| 52 | ConcatFile *cur_file; |
| 53 | unsigned nb_files; |
| 54 | AVFormatContext *avf; |
| 55 | int safe; |
| 56 | int seekable; |
| 57 | ConcatMatchMode stream_match_mode; |
| 58 | unsigned auto_convert; |
| 59 | } ConcatContext; |
| 60 | |
| 61 | static int concat_probe(AVProbeData *probe) |
| 62 | { |
| 63 | return memcmp(probe->buf, "ffconcat version 1.0", 20) ? |
| 64 | 0 : AVPROBE_SCORE_MAX; |
| 65 | } |
| 66 | |
| 67 | static char *get_keyword(uint8_t **cursor) |
| 68 | { |
| 69 | char *ret = *cursor += strspn(*cursor, SPACE_CHARS); |
| 70 | *cursor += strcspn(*cursor, SPACE_CHARS); |
| 71 | if (**cursor) { |
| 72 | *((*cursor)++) = 0; |
| 73 | *cursor += strspn(*cursor, SPACE_CHARS); |
| 74 | } |
| 75 | return ret; |
| 76 | } |
| 77 | |
| 78 | static int safe_filename(const char *f) |
| 79 | { |
| 80 | const char *start = f; |
| 81 | |
| 82 | for (; *f; f++) { |
| 83 | /* A-Za-z0-9_- */ |
| 84 | if (!((unsigned)((*f | 32) - 'a') < 26 || |
| 85 | (unsigned)(*f - '0') < 10 || *f == '_' || *f == '-')) { |
| 86 | if (f == start) |
| 87 | return 0; |
| 88 | else if (*f == '/') |
| 89 | start = f + 1; |
| 90 | else if (*f != '.') |
| 91 | return 0; |
| 92 | } |
| 93 | } |
| 94 | return 1; |
| 95 | } |
| 96 | |
| 97 | #define FAIL(retcode) do { ret = (retcode); goto fail; } while(0) |
| 98 | |
| 99 | static int add_file(AVFormatContext *avf, char *filename, ConcatFile **rfile, |
| 100 | unsigned *nb_files_alloc) |
| 101 | { |
| 102 | ConcatContext *cat = avf->priv_data; |
| 103 | ConcatFile *file; |
| 104 | char *url = NULL; |
| 105 | const char *proto; |
| 106 | size_t url_len, proto_len; |
| 107 | int ret; |
| 108 | |
| 109 | if (cat->safe > 0 && !safe_filename(filename)) { |
| 110 | av_log(avf, AV_LOG_ERROR, "Unsafe file name '%s'\n", filename); |
| 111 | FAIL(AVERROR(EPERM)); |
| 112 | } |
| 113 | |
| 114 | proto = avio_find_protocol_name(filename); |
| 115 | proto_len = proto ? strlen(proto) : 0; |
| 116 | if (!memcmp(filename, proto, proto_len) && |
| 117 | (filename[proto_len] == ':' || filename[proto_len] == ',')) { |
| 118 | url = filename; |
| 119 | filename = NULL; |
| 120 | } else { |
| 121 | url_len = strlen(avf->filename) + strlen(filename) + 16; |
| 122 | if (!(url = av_malloc(url_len))) |
| 123 | FAIL(AVERROR(ENOMEM)); |
| 124 | ff_make_absolute_url(url, url_len, avf->filename, filename); |
| 125 | av_freep(&filename); |
| 126 | } |
| 127 | |
| 128 | if (cat->nb_files >= *nb_files_alloc) { |
| 129 | size_t n = FFMAX(*nb_files_alloc * 2, 16); |
| 130 | ConcatFile *new_files; |
| 131 | if (n <= cat->nb_files || n > SIZE_MAX / sizeof(*cat->files) || |
| 132 | !(new_files = av_realloc(cat->files, n * sizeof(*cat->files)))) |
| 133 | FAIL(AVERROR(ENOMEM)); |
| 134 | cat->files = new_files; |
| 135 | *nb_files_alloc = n; |
| 136 | } |
| 137 | |
| 138 | file = &cat->files[cat->nb_files++]; |
| 139 | memset(file, 0, sizeof(*file)); |
| 140 | *rfile = file; |
| 141 | |
| 142 | file->url = url; |
| 143 | file->start_time = AV_NOPTS_VALUE; |
| 144 | file->duration = AV_NOPTS_VALUE; |
| 145 | |
| 146 | return 0; |
| 147 | |
| 148 | fail: |
| 149 | av_free(url); |
| 150 | av_free(filename); |
| 151 | return ret; |
| 152 | } |
| 153 | |
| 154 | static int copy_stream_props(AVStream *st, AVStream *source_st) |
| 155 | { |
| 156 | int ret; |
| 157 | |
| 158 | if (st->codec->codec_id || !source_st->codec->codec_id) { |
| 159 | if (st->codec->extradata_size < source_st->codec->extradata_size) { |
| 160 | ret = ff_alloc_extradata(st->codec, |
| 161 | source_st->codec->extradata_size); |
| 162 | if (ret < 0) |
| 163 | return ret; |
| 164 | } |
| 165 | memcpy(st->codec->extradata, source_st->codec->extradata, |
| 166 | source_st->codec->extradata_size); |
| 167 | return 0; |
| 168 | } |
| 169 | if ((ret = avcodec_copy_context(st->codec, source_st->codec)) < 0) |
| 170 | return ret; |
| 171 | st->r_frame_rate = source_st->r_frame_rate; |
| 172 | st->avg_frame_rate = source_st->avg_frame_rate; |
| 173 | st->time_base = source_st->time_base; |
| 174 | st->sample_aspect_ratio = source_st->sample_aspect_ratio; |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | static int detect_stream_specific(AVFormatContext *avf, int idx) |
| 179 | { |
| 180 | ConcatContext *cat = avf->priv_data; |
| 181 | AVStream *st = cat->avf->streams[idx]; |
| 182 | ConcatStream *cs = &cat->cur_file->streams[idx]; |
| 183 | AVBitStreamFilterContext *bsf; |
| 184 | |
| 185 | if (cat->auto_convert && st->codec->codec_id == AV_CODEC_ID_H264 && |
| 186 | (st->codec->extradata_size < 4 || AV_RB32(st->codec->extradata) != 1)) { |
| 187 | av_log(cat->avf, AV_LOG_INFO, |
| 188 | "Auto-inserting h264_mp4toannexb bitstream filter\n"); |
| 189 | if (!(bsf = av_bitstream_filter_init("h264_mp4toannexb"))) { |
| 190 | av_log(avf, AV_LOG_ERROR, "h264_mp4toannexb bitstream filter " |
| 191 | "required for H.264 streams\n"); |
| 192 | return AVERROR_BSF_NOT_FOUND; |
| 193 | } |
| 194 | cs->bsf = bsf; |
| 195 | } |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | static int match_streams_one_to_one(AVFormatContext *avf) |
| 200 | { |
| 201 | ConcatContext *cat = avf->priv_data; |
| 202 | AVStream *st; |
| 203 | int i, ret; |
| 204 | |
| 205 | for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) { |
| 206 | if (i < avf->nb_streams) { |
| 207 | st = avf->streams[i]; |
| 208 | } else { |
| 209 | if (!(st = avformat_new_stream(avf, NULL))) |
| 210 | return AVERROR(ENOMEM); |
| 211 | } |
| 212 | if ((ret = copy_stream_props(st, cat->avf->streams[i])) < 0) |
| 213 | return ret; |
| 214 | cat->cur_file->streams[i].out_stream_index = i; |
| 215 | } |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | static int match_streams_exact_id(AVFormatContext *avf) |
| 220 | { |
| 221 | ConcatContext *cat = avf->priv_data; |
| 222 | AVStream *st; |
| 223 | int i, j, ret; |
| 224 | |
| 225 | for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) { |
| 226 | st = cat->avf->streams[i]; |
| 227 | for (j = 0; j < avf->nb_streams; j++) { |
| 228 | if (avf->streams[j]->id == st->id) { |
| 229 | av_log(avf, AV_LOG_VERBOSE, |
| 230 | "Match slave stream #%d with stream #%d id 0x%x\n", |
| 231 | i, j, st->id); |
| 232 | if ((ret = copy_stream_props(avf->streams[j], st)) < 0) |
| 233 | return ret; |
| 234 | cat->cur_file->streams[i].out_stream_index = j; |
| 235 | } |
| 236 | } |
| 237 | } |
| 238 | return 0; |
| 239 | } |
| 240 | |
| 241 | static int match_streams(AVFormatContext *avf) |
| 242 | { |
| 243 | ConcatContext *cat = avf->priv_data; |
| 244 | ConcatStream *map; |
| 245 | int i, ret; |
| 246 | |
| 247 | if (cat->cur_file->nb_streams >= cat->avf->nb_streams) |
| 248 | return 0; |
| 249 | map = av_realloc(cat->cur_file->streams, |
| 250 | cat->avf->nb_streams * sizeof(*map)); |
| 251 | if (!map) |
| 252 | return AVERROR(ENOMEM); |
| 253 | cat->cur_file->streams = map; |
| 254 | memset(map + cat->cur_file->nb_streams, 0, |
| 255 | (cat->avf->nb_streams - cat->cur_file->nb_streams) * sizeof(*map)); |
| 256 | |
| 257 | for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) |
| 258 | map[i].out_stream_index = -1; |
| 259 | switch (cat->stream_match_mode) { |
| 260 | case MATCH_ONE_TO_ONE: |
| 261 | ret = match_streams_one_to_one(avf); |
| 262 | break; |
| 263 | case MATCH_EXACT_ID: |
| 264 | ret = match_streams_exact_id(avf); |
| 265 | break; |
| 266 | default: |
| 267 | ret = AVERROR_BUG; |
| 268 | } |
| 269 | if (ret < 0) |
| 270 | return ret; |
| 271 | for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) |
| 272 | if ((ret = detect_stream_specific(avf, i)) < 0) |
| 273 | return ret; |
| 274 | cat->cur_file->nb_streams = cat->avf->nb_streams; |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | static int open_file(AVFormatContext *avf, unsigned fileno) |
| 279 | { |
| 280 | ConcatContext *cat = avf->priv_data; |
| 281 | ConcatFile *file = &cat->files[fileno]; |
| 282 | int ret; |
| 283 | |
| 284 | if (cat->avf) |
| 285 | avformat_close_input(&cat->avf); |
| 286 | |
| 287 | cat->avf = avformat_alloc_context(); |
| 288 | if (!cat->avf) |
| 289 | return AVERROR(ENOMEM); |
| 290 | |
| 291 | cat->avf->interrupt_callback = avf->interrupt_callback; |
| 292 | |
| 293 | if ((ret = ff_copy_whitelists(cat->avf, avf)) < 0) |
| 294 | return ret; |
| 295 | |
| 296 | if ((ret = avformat_open_input(&cat->avf, file->url, NULL, NULL)) < 0 || |
| 297 | (ret = avformat_find_stream_info(cat->avf, NULL)) < 0) { |
| 298 | av_log(avf, AV_LOG_ERROR, "Impossible to open '%s'\n", file->url); |
| 299 | avformat_close_input(&cat->avf); |
| 300 | return ret; |
| 301 | } |
| 302 | cat->cur_file = file; |
| 303 | if (file->start_time == AV_NOPTS_VALUE) |
| 304 | file->start_time = !fileno ? 0 : |
| 305 | cat->files[fileno - 1].start_time + |
| 306 | cat->files[fileno - 1].duration; |
| 307 | if ((ret = match_streams(avf)) < 0) |
| 308 | return ret; |
| 309 | return 0; |
| 310 | } |
| 311 | |
| 312 | static int concat_read_close(AVFormatContext *avf) |
| 313 | { |
| 314 | ConcatContext *cat = avf->priv_data; |
| 315 | unsigned i; |
| 316 | |
| 317 | if (cat->avf) |
| 318 | avformat_close_input(&cat->avf); |
| 319 | for (i = 0; i < cat->nb_files; i++) { |
| 320 | av_freep(&cat->files[i].url); |
| 321 | av_freep(&cat->files[i].streams); |
| 322 | } |
| 323 | av_freep(&cat->files); |
| 324 | return 0; |
| 325 | } |
| 326 | |
| 327 | static int concat_read_header(AVFormatContext *avf) |
| 328 | { |
| 329 | ConcatContext *cat = avf->priv_data; |
| 330 | uint8_t buf[4096]; |
| 331 | uint8_t *cursor, *keyword; |
| 332 | int ret, line = 0, i; |
| 333 | unsigned nb_files_alloc = 0; |
| 334 | ConcatFile *file = NULL; |
| 335 | int64_t time = 0; |
| 336 | |
| 337 | while (1) { |
| 338 | if ((ret = ff_get_line(avf->pb, buf, sizeof(buf))) <= 0) |
| 339 | break; |
| 340 | line++; |
| 341 | cursor = buf; |
| 342 | keyword = get_keyword(&cursor); |
| 343 | if (!*keyword || *keyword == '#') |
| 344 | continue; |
| 345 | |
| 346 | if (!strcmp(keyword, "file")) { |
| 347 | char *filename = av_get_token((const char **)&cursor, SPACE_CHARS); |
| 348 | if (!filename) { |
| 349 | av_log(avf, AV_LOG_ERROR, "Line %d: filename required\n", line); |
| 350 | FAIL(AVERROR_INVALIDDATA); |
| 351 | } |
| 352 | if ((ret = add_file(avf, filename, &file, &nb_files_alloc)) < 0) |
| 353 | goto fail; |
| 354 | } else if (!strcmp(keyword, "duration")) { |
| 355 | char *dur_str = get_keyword(&cursor); |
| 356 | int64_t dur; |
| 357 | if (!file) { |
| 358 | av_log(avf, AV_LOG_ERROR, "Line %d: duration without file\n", |
| 359 | line); |
| 360 | FAIL(AVERROR_INVALIDDATA); |
| 361 | } |
| 362 | if ((ret = av_parse_time(&dur, dur_str, 1)) < 0) { |
| 363 | av_log(avf, AV_LOG_ERROR, "Line %d: invalid duration '%s'\n", |
| 364 | line, dur_str); |
| 365 | goto fail; |
| 366 | } |
| 367 | file->duration = dur; |
| 368 | } else if (!strcmp(keyword, "stream")) { |
| 369 | if (!avformat_new_stream(avf, NULL)) |
| 370 | FAIL(AVERROR(ENOMEM)); |
| 371 | } else if (!strcmp(keyword, "exact_stream_id")) { |
| 372 | if (!avf->nb_streams) { |
| 373 | av_log(avf, AV_LOG_ERROR, "Line %d: exact_stream_id without stream\n", |
| 374 | line); |
| 375 | FAIL(AVERROR_INVALIDDATA); |
| 376 | } |
| 377 | avf->streams[avf->nb_streams - 1]->id = |
| 378 | strtol(get_keyword(&cursor), NULL, 0); |
| 379 | } else if (!strcmp(keyword, "ffconcat")) { |
| 380 | char *ver_kw = get_keyword(&cursor); |
| 381 | char *ver_val = get_keyword(&cursor); |
| 382 | if (strcmp(ver_kw, "version") || strcmp(ver_val, "1.0")) { |
| 383 | av_log(avf, AV_LOG_ERROR, "Line %d: invalid version\n", line); |
| 384 | FAIL(AVERROR_INVALIDDATA); |
| 385 | } |
| 386 | if (cat->safe < 0) |
| 387 | cat->safe = 1; |
| 388 | } else { |
| 389 | av_log(avf, AV_LOG_ERROR, "Line %d: unknown keyword '%s'\n", |
| 390 | line, keyword); |
| 391 | FAIL(AVERROR_INVALIDDATA); |
| 392 | } |
| 393 | } |
| 394 | if (ret < 0) |
| 395 | goto fail; |
| 396 | if (!cat->nb_files) |
| 397 | FAIL(AVERROR_INVALIDDATA); |
| 398 | |
| 399 | for (i = 0; i < cat->nb_files; i++) { |
| 400 | if (cat->files[i].start_time == AV_NOPTS_VALUE) |
| 401 | cat->files[i].start_time = time; |
| 402 | else |
| 403 | time = cat->files[i].start_time; |
| 404 | if (cat->files[i].duration == AV_NOPTS_VALUE) |
| 405 | break; |
| 406 | time += cat->files[i].duration; |
| 407 | } |
| 408 | if (i == cat->nb_files) { |
| 409 | avf->duration = time; |
| 410 | cat->seekable = 1; |
| 411 | } |
| 412 | |
| 413 | cat->stream_match_mode = avf->nb_streams ? MATCH_EXACT_ID : |
| 414 | MATCH_ONE_TO_ONE; |
| 415 | if ((ret = open_file(avf, 0)) < 0) |
| 416 | goto fail; |
| 417 | return 0; |
| 418 | |
| 419 | fail: |
| 420 | concat_read_close(avf); |
| 421 | return ret; |
| 422 | } |
| 423 | |
| 424 | static int open_next_file(AVFormatContext *avf) |
| 425 | { |
| 426 | ConcatContext *cat = avf->priv_data; |
| 427 | unsigned fileno = cat->cur_file - cat->files; |
| 428 | |
| 429 | if (cat->cur_file->duration == AV_NOPTS_VALUE) |
| 430 | cat->cur_file->duration = cat->avf->duration; |
| 431 | |
| 432 | if (++fileno >= cat->nb_files) |
| 433 | return AVERROR_EOF; |
| 434 | return open_file(avf, fileno); |
| 435 | } |
| 436 | |
| 437 | static int filter_packet(AVFormatContext *avf, ConcatStream *cs, AVPacket *pkt) |
| 438 | { |
| 439 | AVStream *st = avf->streams[cs->out_stream_index]; |
| 440 | AVBitStreamFilterContext *bsf; |
| 441 | AVPacket pkt2; |
| 442 | int ret; |
| 443 | |
| 444 | av_assert0(cs->out_stream_index >= 0); |
| 445 | for (bsf = cs->bsf; bsf; bsf = bsf->next) { |
| 446 | pkt2 = *pkt; |
| 447 | ret = av_bitstream_filter_filter(bsf, st->codec, NULL, |
| 448 | &pkt2.data, &pkt2.size, |
| 449 | pkt->data, pkt->size, |
| 450 | !!(pkt->flags & AV_PKT_FLAG_KEY)); |
| 451 | if (ret < 0) { |
| 452 | av_packet_unref(pkt); |
| 453 | return ret; |
| 454 | } |
| 455 | av_assert0(pkt2.buf); |
| 456 | if (ret == 0 && pkt2.data != pkt->data) { |
| 457 | if ((ret = av_copy_packet(&pkt2, pkt)) < 0) { |
| 458 | av_free(pkt2.data); |
| 459 | return ret; |
| 460 | } |
| 461 | ret = 1; |
| 462 | } |
| 463 | if (ret > 0) { |
| 464 | av_free_packet(pkt); |
| 465 | pkt2.buf = av_buffer_create(pkt2.data, pkt2.size, |
| 466 | av_buffer_default_free, NULL, 0); |
| 467 | if (!pkt2.buf) { |
| 468 | av_free(pkt2.data); |
| 469 | return AVERROR(ENOMEM); |
| 470 | } |
| 471 | } |
| 472 | *pkt = pkt2; |
| 473 | } |
| 474 | return 0; |
| 475 | } |
| 476 | |
| 477 | static int concat_read_packet(AVFormatContext *avf, AVPacket *pkt) |
| 478 | { |
| 479 | ConcatContext *cat = avf->priv_data; |
| 480 | int ret; |
| 481 | int64_t delta; |
| 482 | ConcatStream *cs; |
| 483 | AVStream *st; |
| 484 | |
| 485 | while (1) { |
| 486 | ret = av_read_frame(cat->avf, pkt); |
| 487 | if (ret == AVERROR_EOF) { |
| 488 | if ((ret = open_next_file(avf)) < 0) |
| 489 | return ret; |
| 490 | continue; |
| 491 | } |
| 492 | if (ret < 0) |
| 493 | return ret; |
| 494 | if ((ret = match_streams(avf)) < 0) { |
| 495 | av_packet_unref(pkt); |
| 496 | return ret; |
| 497 | } |
| 498 | cs = &cat->cur_file->streams[pkt->stream_index]; |
| 499 | if (cs->out_stream_index < 0) { |
| 500 | av_packet_unref(pkt); |
| 501 | continue; |
| 502 | } |
| 503 | pkt->stream_index = cs->out_stream_index; |
| 504 | break; |
| 505 | } |
| 506 | if ((ret = filter_packet(avf, cs, pkt))) |
| 507 | return ret; |
| 508 | |
| 509 | st = cat->avf->streams[pkt->stream_index]; |
| 510 | av_log(avf, AV_LOG_DEBUG, "file:%d stream:%d pts:%s pts_time:%s dts:%s dts_time:%s", |
| 511 | (unsigned)(cat->cur_file - cat->files), pkt->stream_index, |
| 512 | av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), |
| 513 | av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base)); |
| 514 | |
| 515 | delta = av_rescale_q(cat->cur_file->start_time - cat->avf->start_time, |
| 516 | AV_TIME_BASE_Q, |
| 517 | cat->avf->streams[pkt->stream_index]->time_base); |
| 518 | if (pkt->pts != AV_NOPTS_VALUE) |
| 519 | pkt->pts += delta; |
| 520 | if (pkt->dts != AV_NOPTS_VALUE) |
| 521 | pkt->dts += delta; |
| 522 | av_log(avf, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n", |
| 523 | av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), |
| 524 | av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base)); |
| 525 | return ret; |
| 526 | } |
| 527 | |
| 528 | static void rescale_interval(AVRational tb_in, AVRational tb_out, |
| 529 | int64_t *min_ts, int64_t *ts, int64_t *max_ts) |
| 530 | { |
| 531 | *ts = av_rescale_q (* ts, tb_in, tb_out); |
| 532 | *min_ts = av_rescale_q_rnd(*min_ts, tb_in, tb_out, |
| 533 | AV_ROUND_UP | AV_ROUND_PASS_MINMAX); |
| 534 | *max_ts = av_rescale_q_rnd(*max_ts, tb_in, tb_out, |
| 535 | AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX); |
| 536 | } |
| 537 | |
| 538 | static int try_seek(AVFormatContext *avf, int stream, |
| 539 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
| 540 | { |
| 541 | ConcatContext *cat = avf->priv_data; |
| 542 | int64_t t0 = cat->cur_file->start_time - cat->avf->start_time; |
| 543 | |
| 544 | ts -= t0; |
| 545 | min_ts = min_ts == INT64_MIN ? INT64_MIN : min_ts - t0; |
| 546 | max_ts = max_ts == INT64_MAX ? INT64_MAX : max_ts - t0; |
| 547 | if (stream >= 0) { |
| 548 | if (stream >= cat->avf->nb_streams) |
| 549 | return AVERROR(EIO); |
| 550 | rescale_interval(AV_TIME_BASE_Q, cat->avf->streams[stream]->time_base, |
| 551 | &min_ts, &ts, &max_ts); |
| 552 | } |
| 553 | return avformat_seek_file(cat->avf, stream, min_ts, ts, max_ts, flags); |
| 554 | } |
| 555 | |
| 556 | static int real_seek(AVFormatContext *avf, int stream, |
| 557 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
| 558 | { |
| 559 | ConcatContext *cat = avf->priv_data; |
| 560 | int ret, left, right; |
| 561 | |
| 562 | if (stream >= 0) { |
| 563 | if (stream >= avf->nb_streams) |
| 564 | return AVERROR(EINVAL); |
| 565 | rescale_interval(avf->streams[stream]->time_base, AV_TIME_BASE_Q, |
| 566 | &min_ts, &ts, &max_ts); |
| 567 | } |
| 568 | |
| 569 | left = 0; |
| 570 | right = cat->nb_files; |
| 571 | while (right - left > 1) { |
| 572 | int mid = (left + right) / 2; |
| 573 | if (ts < cat->files[mid].start_time) |
| 574 | right = mid; |
| 575 | else |
| 576 | left = mid; |
| 577 | } |
| 578 | |
| 579 | if ((ret = open_file(avf, left)) < 0) |
| 580 | return ret; |
| 581 | |
| 582 | ret = try_seek(avf, stream, min_ts, ts, max_ts, flags); |
| 583 | if (ret < 0 && |
| 584 | left < cat->nb_files - 1 && |
| 585 | cat->files[left + 1].start_time < max_ts) { |
| 586 | if ((ret = open_file(avf, left + 1)) < 0) |
| 587 | return ret; |
| 588 | ret = try_seek(avf, stream, min_ts, ts, max_ts, flags); |
| 589 | } |
| 590 | return ret; |
| 591 | } |
| 592 | |
| 593 | static int concat_seek(AVFormatContext *avf, int stream, |
| 594 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
| 595 | { |
| 596 | ConcatContext *cat = avf->priv_data; |
| 597 | ConcatFile *cur_file_saved = cat->cur_file; |
| 598 | AVFormatContext *cur_avf_saved = cat->avf; |
| 599 | int ret; |
| 600 | |
| 601 | if (!cat->seekable) |
| 602 | return AVERROR(ESPIPE); /* XXX: can we use it? */ |
| 603 | if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME)) |
| 604 | return AVERROR(ENOSYS); |
| 605 | cat->avf = NULL; |
| 606 | if ((ret = real_seek(avf, stream, min_ts, ts, max_ts, flags)) < 0) { |
| 607 | if (cat->avf) |
| 608 | avformat_close_input(&cat->avf); |
| 609 | cat->avf = cur_avf_saved; |
| 610 | cat->cur_file = cur_file_saved; |
| 611 | } else { |
| 612 | avformat_close_input(&cur_avf_saved); |
| 613 | } |
| 614 | return ret; |
| 615 | } |
| 616 | |
| 617 | #define OFFSET(x) offsetof(ConcatContext, x) |
| 618 | #define DEC AV_OPT_FLAG_DECODING_PARAM |
| 619 | |
| 620 | static const AVOption options[] = { |
| 621 | { "safe", "enable safe mode", |
| 622 | OFFSET(safe), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, DEC }, |
| 623 | { "auto_convert", "automatically convert bitstream format", |
| 624 | OFFSET(auto_convert), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC }, |
| 625 | { NULL } |
| 626 | }; |
| 627 | |
| 628 | static const AVClass concat_class = { |
| 629 | .class_name = "concat demuxer", |
| 630 | .item_name = av_default_item_name, |
| 631 | .option = options, |
| 632 | .version = LIBAVUTIL_VERSION_INT, |
| 633 | }; |
| 634 | |
| 635 | |
| 636 | AVInputFormat ff_concat_demuxer = { |
| 637 | .name = "concat", |
| 638 | .long_name = NULL_IF_CONFIG_SMALL("Virtual concatenation script"), |
| 639 | .priv_data_size = sizeof(ConcatContext), |
| 640 | .read_probe = concat_probe, |
| 641 | .read_header = concat_read_header, |
| 642 | .read_packet = concat_read_packet, |
| 643 | .read_close = concat_read_close, |
| 644 | .read_seek2 = concat_seek, |
| 645 | .priv_class = &concat_class, |
| 646 | }; |