| 1 | /* |
| 2 | * AVI demuxer |
| 3 | * Copyright (c) 2001 Fabrice Bellard |
| 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 <inttypes.h> |
| 23 | |
| 24 | #include "libavutil/avassert.h" |
| 25 | #include "libavutil/avstring.h" |
| 26 | #include "libavutil/bswap.h" |
| 27 | #include "libavutil/opt.h" |
| 28 | #include "libavutil/dict.h" |
| 29 | #include "libavutil/internal.h" |
| 30 | #include "libavutil/intreadwrite.h" |
| 31 | #include "libavutil/mathematics.h" |
| 32 | #include "avformat.h" |
| 33 | #include "avi.h" |
| 34 | #include "dv.h" |
| 35 | #include "internal.h" |
| 36 | #include "riff.h" |
| 37 | #include "libavcodec/bytestream.h" |
| 38 | #include "libavcodec/exif.h" |
| 39 | |
| 40 | typedef struct AVIStream { |
| 41 | int64_t frame_offset; /* current frame (video) or byte (audio) counter |
| 42 | * (used to compute the pts) */ |
| 43 | int remaining; |
| 44 | int packet_size; |
| 45 | |
| 46 | uint32_t scale; |
| 47 | uint32_t rate; |
| 48 | int sample_size; /* size of one sample (or packet) |
| 49 | * (in the rate/scale sense) in bytes */ |
| 50 | |
| 51 | int64_t cum_len; /* temporary storage (used during seek) */ |
| 52 | int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */ |
| 53 | int prefix_count; |
| 54 | uint32_t pal[256]; |
| 55 | int has_pal; |
| 56 | int dshow_block_align; /* block align variable used to emulate bugs in |
| 57 | * the MS dshow demuxer */ |
| 58 | |
| 59 | AVFormatContext *sub_ctx; |
| 60 | AVPacket sub_pkt; |
| 61 | uint8_t *sub_buffer; |
| 62 | |
| 63 | int64_t seek_pos; |
| 64 | } AVIStream; |
| 65 | |
| 66 | typedef struct { |
| 67 | const AVClass *class; |
| 68 | int64_t riff_end; |
| 69 | int64_t movi_end; |
| 70 | int64_t fsize; |
| 71 | int64_t io_fsize; |
| 72 | int64_t movi_list; |
| 73 | int64_t last_pkt_pos; |
| 74 | int index_loaded; |
| 75 | int is_odml; |
| 76 | int non_interleaved; |
| 77 | int stream_index; |
| 78 | DVDemuxContext *dv_demux; |
| 79 | int odml_depth; |
| 80 | int use_odml; |
| 81 | #define MAX_ODML_DEPTH 1000 |
| 82 | int64_t dts_max; |
| 83 | } AVIContext; |
| 84 | |
| 85 | |
| 86 | static const AVOption options[] = { |
| 87 | { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM}, |
| 88 | { NULL }, |
| 89 | }; |
| 90 | |
| 91 | static const AVClass demuxer_class = { |
| 92 | .class_name = "avi", |
| 93 | .item_name = av_default_item_name, |
| 94 | .option = options, |
| 95 | .version = LIBAVUTIL_VERSION_INT, |
| 96 | .category = AV_CLASS_CATEGORY_DEMUXER, |
| 97 | }; |
| 98 | |
| 99 | |
| 100 | static const char avi_headers[][8] = { |
| 101 | { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' }, |
| 102 | { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' }, |
| 103 | { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 }, |
| 104 | { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' }, |
| 105 | { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' }, |
| 106 | { 0 } |
| 107 | }; |
| 108 | |
| 109 | static const AVMetadataConv avi_metadata_conv[] = { |
| 110 | { "strn", "title" }, |
| 111 | { 0 }, |
| 112 | }; |
| 113 | |
| 114 | static int avi_load_index(AVFormatContext *s); |
| 115 | static int guess_ni_flag(AVFormatContext *s); |
| 116 | |
| 117 | #define print_tag(str, tag, size) \ |
| 118 | av_dlog(NULL, "pos:%"PRIX64" %s: tag=%c%c%c%c size=0x%x\n", \ |
| 119 | avio_tell(pb), str, tag & 0xff, \ |
| 120 | (tag >> 8) & 0xff, \ |
| 121 | (tag >> 16) & 0xff, \ |
| 122 | (tag >> 24) & 0xff, \ |
| 123 | size) |
| 124 | |
| 125 | static inline int get_duration(AVIStream *ast, int len) |
| 126 | { |
| 127 | if (ast->sample_size) |
| 128 | return len; |
| 129 | else if (ast->dshow_block_align) |
| 130 | return (len + ast->dshow_block_align - 1) / ast->dshow_block_align; |
| 131 | else |
| 132 | return 1; |
| 133 | } |
| 134 | |
| 135 | static int get_riff(AVFormatContext *s, AVIOContext *pb) |
| 136 | { |
| 137 | AVIContext *avi = s->priv_data; |
| 138 | char header[8]; |
| 139 | int i; |
| 140 | |
| 141 | /* check RIFF header */ |
| 142 | avio_read(pb, header, 4); |
| 143 | avi->riff_end = avio_rl32(pb); /* RIFF chunk size */ |
| 144 | avi->riff_end += avio_tell(pb); /* RIFF chunk end */ |
| 145 | avio_read(pb, header + 4, 4); |
| 146 | |
| 147 | for (i = 0; avi_headers[i][0]; i++) |
| 148 | if (!memcmp(header, avi_headers[i], 8)) |
| 149 | break; |
| 150 | if (!avi_headers[i][0]) |
| 151 | return AVERROR_INVALIDDATA; |
| 152 | |
| 153 | if (header[7] == 0x19) |
| 154 | av_log(s, AV_LOG_INFO, |
| 155 | "This file has been generated by a totally broken muxer.\n"); |
| 156 | |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | static int read_braindead_odml_indx(AVFormatContext *s, int frame_num) |
| 161 | { |
| 162 | AVIContext *avi = s->priv_data; |
| 163 | AVIOContext *pb = s->pb; |
| 164 | int longs_pre_entry = avio_rl16(pb); |
| 165 | int index_sub_type = avio_r8(pb); |
| 166 | int index_type = avio_r8(pb); |
| 167 | int entries_in_use = avio_rl32(pb); |
| 168 | int chunk_id = avio_rl32(pb); |
| 169 | int64_t base = avio_rl64(pb); |
| 170 | int stream_id = ((chunk_id & 0xFF) - '0') * 10 + |
| 171 | ((chunk_id >> 8 & 0xFF) - '0'); |
| 172 | AVStream *st; |
| 173 | AVIStream *ast; |
| 174 | int i; |
| 175 | int64_t last_pos = -1; |
| 176 | int64_t filesize = avi->fsize; |
| 177 | |
| 178 | av_dlog(s, |
| 179 | "longs_pre_entry:%d index_type:%d entries_in_use:%d " |
| 180 | "chunk_id:%X base:%16"PRIX64"\n", |
| 181 | longs_pre_entry, |
| 182 | index_type, |
| 183 | entries_in_use, |
| 184 | chunk_id, |
| 185 | base); |
| 186 | |
| 187 | if (stream_id >= s->nb_streams || stream_id < 0) |
| 188 | return AVERROR_INVALIDDATA; |
| 189 | st = s->streams[stream_id]; |
| 190 | ast = st->priv_data; |
| 191 | |
| 192 | if (index_sub_type) |
| 193 | return AVERROR_INVALIDDATA; |
| 194 | |
| 195 | avio_rl32(pb); |
| 196 | |
| 197 | if (index_type && longs_pre_entry != 2) |
| 198 | return AVERROR_INVALIDDATA; |
| 199 | if (index_type > 1) |
| 200 | return AVERROR_INVALIDDATA; |
| 201 | |
| 202 | if (filesize > 0 && base >= filesize) { |
| 203 | av_log(s, AV_LOG_ERROR, "ODML index invalid\n"); |
| 204 | if (base >> 32 == (base & 0xFFFFFFFF) && |
| 205 | (base & 0xFFFFFFFF) < filesize && |
| 206 | filesize <= 0xFFFFFFFF) |
| 207 | base &= 0xFFFFFFFF; |
| 208 | else |
| 209 | return AVERROR_INVALIDDATA; |
| 210 | } |
| 211 | |
| 212 | for (i = 0; i < entries_in_use; i++) { |
| 213 | if (index_type) { |
| 214 | int64_t pos = avio_rl32(pb) + base - 8; |
| 215 | int len = avio_rl32(pb); |
| 216 | int key = len >= 0; |
| 217 | len &= 0x7FFFFFFF; |
| 218 | |
| 219 | #ifdef DEBUG_SEEK |
| 220 | av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len); |
| 221 | #endif |
| 222 | if (avio_feof(pb)) |
| 223 | return AVERROR_INVALIDDATA; |
| 224 | |
| 225 | if (last_pos == pos || pos == base - 8) |
| 226 | avi->non_interleaved = 1; |
| 227 | if (last_pos != pos && len) |
| 228 | av_add_index_entry(st, pos, ast->cum_len, len, 0, |
| 229 | key ? AVINDEX_KEYFRAME : 0); |
| 230 | |
| 231 | ast->cum_len += get_duration(ast, len); |
| 232 | last_pos = pos; |
| 233 | } else { |
| 234 | int64_t offset, pos; |
| 235 | int duration; |
| 236 | offset = avio_rl64(pb); |
| 237 | avio_rl32(pb); /* size */ |
| 238 | duration = avio_rl32(pb); |
| 239 | |
| 240 | if (avio_feof(pb)) |
| 241 | return AVERROR_INVALIDDATA; |
| 242 | |
| 243 | pos = avio_tell(pb); |
| 244 | |
| 245 | if (avi->odml_depth > MAX_ODML_DEPTH) { |
| 246 | av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n"); |
| 247 | return AVERROR_INVALIDDATA; |
| 248 | } |
| 249 | |
| 250 | if (avio_seek(pb, offset + 8, SEEK_SET) < 0) |
| 251 | return -1; |
| 252 | avi->odml_depth++; |
| 253 | read_braindead_odml_indx(s, frame_num); |
| 254 | avi->odml_depth--; |
| 255 | frame_num += duration; |
| 256 | |
| 257 | if (avio_seek(pb, pos, SEEK_SET) < 0) { |
| 258 | av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n"); |
| 259 | return -1; |
| 260 | } |
| 261 | |
| 262 | } |
| 263 | } |
| 264 | avi->index_loaded = 2; |
| 265 | return 0; |
| 266 | } |
| 267 | |
| 268 | static void clean_index(AVFormatContext *s) |
| 269 | { |
| 270 | int i; |
| 271 | int64_t j; |
| 272 | |
| 273 | for (i = 0; i < s->nb_streams; i++) { |
| 274 | AVStream *st = s->streams[i]; |
| 275 | AVIStream *ast = st->priv_data; |
| 276 | int n = st->nb_index_entries; |
| 277 | int max = ast->sample_size; |
| 278 | int64_t pos, size, ts; |
| 279 | |
| 280 | if (n != 1 || ast->sample_size == 0) |
| 281 | continue; |
| 282 | |
| 283 | while (max < 1024) |
| 284 | max += max; |
| 285 | |
| 286 | pos = st->index_entries[0].pos; |
| 287 | size = st->index_entries[0].size; |
| 288 | ts = st->index_entries[0].timestamp; |
| 289 | |
| 290 | for (j = 0; j < size; j += max) |
| 291 | av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0, |
| 292 | AVINDEX_KEYFRAME); |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, |
| 297 | uint32_t size) |
| 298 | { |
| 299 | AVIOContext *pb = s->pb; |
| 300 | char key[5] = { 0 }; |
| 301 | char *value; |
| 302 | |
| 303 | size += (size & 1); |
| 304 | |
| 305 | if (size == UINT_MAX) |
| 306 | return AVERROR(EINVAL); |
| 307 | value = av_malloc(size + 1); |
| 308 | if (!value) |
| 309 | return AVERROR(ENOMEM); |
| 310 | avio_read(pb, value, size); |
| 311 | value[size] = 0; |
| 312 | |
| 313 | AV_WL32(key, tag); |
| 314 | |
| 315 | return av_dict_set(st ? &st->metadata : &s->metadata, key, value, |
| 316 | AV_DICT_DONT_STRDUP_VAL); |
| 317 | } |
| 318 | |
| 319 | static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
| 320 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; |
| 321 | |
| 322 | static void avi_metadata_creation_time(AVDictionary **metadata, char *date) |
| 323 | { |
| 324 | char month[4], time[9], buffer[64]; |
| 325 | int i, day, year; |
| 326 | /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */ |
| 327 | if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d", |
| 328 | month, &day, time, &year) == 4) { |
| 329 | for (i = 0; i < 12; i++) |
| 330 | if (!av_strcasecmp(month, months[i])) { |
| 331 | snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s", |
| 332 | year, i + 1, day, time); |
| 333 | av_dict_set(metadata, "creation_time", buffer, 0); |
| 334 | } |
| 335 | } else if (date[4] == '/' && date[7] == '/') { |
| 336 | date[4] = date[7] = '-'; |
| 337 | av_dict_set(metadata, "creation_time", date, 0); |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | static void avi_read_nikon(AVFormatContext *s, uint64_t end) |
| 342 | { |
| 343 | while (avio_tell(s->pb) < end) { |
| 344 | uint32_t tag = avio_rl32(s->pb); |
| 345 | uint32_t size = avio_rl32(s->pb); |
| 346 | switch (tag) { |
| 347 | case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */ |
| 348 | { |
| 349 | uint64_t tag_end = avio_tell(s->pb) + size; |
| 350 | while (avio_tell(s->pb) < tag_end) { |
| 351 | uint16_t tag = avio_rl16(s->pb); |
| 352 | uint16_t size = avio_rl16(s->pb); |
| 353 | const char *name = NULL; |
| 354 | char buffer[64] = { 0 }; |
| 355 | size = FFMIN(size, tag_end - avio_tell(s->pb)); |
| 356 | size -= avio_read(s->pb, buffer, |
| 357 | FFMIN(size, sizeof(buffer) - 1)); |
| 358 | switch (tag) { |
| 359 | case 0x03: |
| 360 | name = "maker"; |
| 361 | break; |
| 362 | case 0x04: |
| 363 | name = "model"; |
| 364 | break; |
| 365 | case 0x13: |
| 366 | name = "creation_time"; |
| 367 | if (buffer[4] == ':' && buffer[7] == ':') |
| 368 | buffer[4] = buffer[7] = '-'; |
| 369 | break; |
| 370 | } |
| 371 | if (name) |
| 372 | av_dict_set(&s->metadata, name, buffer, 0); |
| 373 | avio_skip(s->pb, size); |
| 374 | } |
| 375 | break; |
| 376 | } |
| 377 | default: |
| 378 | avio_skip(s->pb, size); |
| 379 | break; |
| 380 | } |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | static int avi_extract_stream_metadata(AVStream *st) |
| 385 | { |
| 386 | GetByteContext gb; |
| 387 | uint8_t *data = st->codec->extradata; |
| 388 | int data_size = st->codec->extradata_size; |
| 389 | int tag, offset; |
| 390 | |
| 391 | if (!data || data_size < 8) { |
| 392 | return AVERROR_INVALIDDATA; |
| 393 | } |
| 394 | |
| 395 | bytestream2_init(&gb, data, data_size); |
| 396 | |
| 397 | tag = bytestream2_get_le32(&gb); |
| 398 | |
| 399 | switch (tag) { |
| 400 | case MKTAG('A', 'V', 'I', 'F'): |
| 401 | // skip 4 byte padding |
| 402 | bytestream2_skip(&gb, 4); |
| 403 | offset = bytestream2_tell(&gb); |
| 404 | bytestream2_init(&gb, data + offset, data_size - offset); |
| 405 | |
| 406 | // decode EXIF tags from IFD, AVI is always little-endian |
| 407 | return avpriv_exif_decode_ifd(st->codec, &gb, 1, 0, &st->metadata); |
| 408 | break; |
| 409 | case MKTAG('C', 'A', 'S', 'I'): |
| 410 | avpriv_request_sample(st->codec, "RIFF stream data tag type CASI (%u)", tag); |
| 411 | break; |
| 412 | case MKTAG('Z', 'o', 'r', 'a'): |
| 413 | avpriv_request_sample(st->codec, "RIFF stream data tag type Zora (%u)", tag); |
| 414 | break; |
| 415 | default: |
| 416 | break; |
| 417 | } |
| 418 | |
| 419 | return 0; |
| 420 | } |
| 421 | |
| 422 | static int calculate_bitrate(AVFormatContext *s) |
| 423 | { |
| 424 | AVIContext *avi = s->priv_data; |
| 425 | int i, j; |
| 426 | int64_t lensum = 0; |
| 427 | int64_t maxpos = 0; |
| 428 | |
| 429 | for (i = 0; i<s->nb_streams; i++) { |
| 430 | int64_t len = 0; |
| 431 | AVStream *st = s->streams[i]; |
| 432 | |
| 433 | if (!st->nb_index_entries) |
| 434 | continue; |
| 435 | |
| 436 | for (j = 0; j < st->nb_index_entries; j++) |
| 437 | len += st->index_entries[j].size; |
| 438 | maxpos = FFMAX(maxpos, st->index_entries[j-1].pos); |
| 439 | lensum += len; |
| 440 | } |
| 441 | if (maxpos < avi->io_fsize*9/10) // index does not cover the whole file |
| 442 | return 0; |
| 443 | if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch |
| 444 | return 0; |
| 445 | |
| 446 | for (i = 0; i<s->nb_streams; i++) { |
| 447 | int64_t len = 0; |
| 448 | AVStream *st = s->streams[i]; |
| 449 | int64_t duration; |
| 450 | |
| 451 | for (j = 0; j < st->nb_index_entries; j++) |
| 452 | len += st->index_entries[j].size; |
| 453 | |
| 454 | if (st->nb_index_entries < 2 || st->codec->bit_rate > 0) |
| 455 | continue; |
| 456 | duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp; |
| 457 | st->codec->bit_rate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num); |
| 458 | } |
| 459 | return 1; |
| 460 | } |
| 461 | |
| 462 | static int avi_read_header(AVFormatContext *s) |
| 463 | { |
| 464 | AVIContext *avi = s->priv_data; |
| 465 | AVIOContext *pb = s->pb; |
| 466 | unsigned int tag, tag1, handler; |
| 467 | int codec_type, stream_index, frame_period; |
| 468 | unsigned int size; |
| 469 | int i; |
| 470 | AVStream *st; |
| 471 | AVIStream *ast = NULL; |
| 472 | int avih_width = 0, avih_height = 0; |
| 473 | int amv_file_format = 0; |
| 474 | uint64_t list_end = 0; |
| 475 | int ret; |
| 476 | AVDictionaryEntry *dict_entry; |
| 477 | |
| 478 | avi->stream_index = -1; |
| 479 | |
| 480 | ret = get_riff(s, pb); |
| 481 | if (ret < 0) |
| 482 | return ret; |
| 483 | |
| 484 | av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml); |
| 485 | |
| 486 | avi->io_fsize = avi->fsize = avio_size(pb); |
| 487 | if (avi->fsize <= 0 || avi->fsize < avi->riff_end) |
| 488 | avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end; |
| 489 | |
| 490 | /* first list tag */ |
| 491 | stream_index = -1; |
| 492 | codec_type = -1; |
| 493 | frame_period = 0; |
| 494 | for (;;) { |
| 495 | if (avio_feof(pb)) |
| 496 | goto fail; |
| 497 | tag = avio_rl32(pb); |
| 498 | size = avio_rl32(pb); |
| 499 | |
| 500 | print_tag("tag", tag, size); |
| 501 | |
| 502 | switch (tag) { |
| 503 | case MKTAG('L', 'I', 'S', 'T'): |
| 504 | list_end = avio_tell(pb) + size; |
| 505 | /* Ignored, except at start of video packets. */ |
| 506 | tag1 = avio_rl32(pb); |
| 507 | |
| 508 | print_tag("list", tag1, 0); |
| 509 | |
| 510 | if (tag1 == MKTAG('m', 'o', 'v', 'i')) { |
| 511 | avi->movi_list = avio_tell(pb) - 4; |
| 512 | if (size) |
| 513 | avi->movi_end = avi->movi_list + size + (size & 1); |
| 514 | else |
| 515 | avi->movi_end = avi->fsize; |
| 516 | av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end); |
| 517 | goto end_of_header; |
| 518 | } else if (tag1 == MKTAG('I', 'N', 'F', 'O')) |
| 519 | ff_read_riff_info(s, size - 4); |
| 520 | else if (tag1 == MKTAG('n', 'c', 'd', 't')) |
| 521 | avi_read_nikon(s, list_end); |
| 522 | |
| 523 | break; |
| 524 | case MKTAG('I', 'D', 'I', 'T'): |
| 525 | { |
| 526 | unsigned char date[64] = { 0 }; |
| 527 | size += (size & 1); |
| 528 | size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1)); |
| 529 | avio_skip(pb, size); |
| 530 | avi_metadata_creation_time(&s->metadata, date); |
| 531 | break; |
| 532 | } |
| 533 | case MKTAG('d', 'm', 'l', 'h'): |
| 534 | avi->is_odml = 1; |
| 535 | avio_skip(pb, size + (size & 1)); |
| 536 | break; |
| 537 | case MKTAG('a', 'm', 'v', 'h'): |
| 538 | amv_file_format = 1; |
| 539 | case MKTAG('a', 'v', 'i', 'h'): |
| 540 | /* AVI header */ |
| 541 | /* using frame_period is bad idea */ |
| 542 | frame_period = avio_rl32(pb); |
| 543 | avio_rl32(pb); /* max. bytes per second */ |
| 544 | avio_rl32(pb); |
| 545 | avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX; |
| 546 | |
| 547 | avio_skip(pb, 2 * 4); |
| 548 | avio_rl32(pb); |
| 549 | avio_rl32(pb); |
| 550 | avih_width = avio_rl32(pb); |
| 551 | avih_height = avio_rl32(pb); |
| 552 | |
| 553 | avio_skip(pb, size - 10 * 4); |
| 554 | break; |
| 555 | case MKTAG('s', 't', 'r', 'h'): |
| 556 | /* stream header */ |
| 557 | |
| 558 | tag1 = avio_rl32(pb); |
| 559 | handler = avio_rl32(pb); /* codec tag */ |
| 560 | |
| 561 | if (tag1 == MKTAG('p', 'a', 'd', 's')) { |
| 562 | avio_skip(pb, size - 8); |
| 563 | break; |
| 564 | } else { |
| 565 | stream_index++; |
| 566 | st = avformat_new_stream(s, NULL); |
| 567 | if (!st) |
| 568 | goto fail; |
| 569 | |
| 570 | st->id = stream_index; |
| 571 | ast = av_mallocz(sizeof(AVIStream)); |
| 572 | if (!ast) |
| 573 | goto fail; |
| 574 | st->priv_data = ast; |
| 575 | } |
| 576 | if (amv_file_format) |
| 577 | tag1 = stream_index ? MKTAG('a', 'u', 'd', 's') |
| 578 | : MKTAG('v', 'i', 'd', 's'); |
| 579 | |
| 580 | print_tag("strh", tag1, -1); |
| 581 | |
| 582 | if (tag1 == MKTAG('i', 'a', 'v', 's') || |
| 583 | tag1 == MKTAG('i', 'v', 'a', 's')) { |
| 584 | int64_t dv_dur; |
| 585 | |
| 586 | /* After some consideration -- I don't think we |
| 587 | * have to support anything but DV in type1 AVIs. */ |
| 588 | if (s->nb_streams != 1) |
| 589 | goto fail; |
| 590 | |
| 591 | if (handler != MKTAG('d', 'v', 's', 'd') && |
| 592 | handler != MKTAG('d', 'v', 'h', 'd') && |
| 593 | handler != MKTAG('d', 'v', 's', 'l')) |
| 594 | goto fail; |
| 595 | |
| 596 | ast = s->streams[0]->priv_data; |
| 597 | av_freep(&s->streams[0]->codec->extradata); |
| 598 | av_freep(&s->streams[0]->codec); |
| 599 | if (s->streams[0]->info) |
| 600 | av_freep(&s->streams[0]->info->duration_error); |
| 601 | av_freep(&s->streams[0]->info); |
| 602 | av_freep(&s->streams[0]); |
| 603 | s->nb_streams = 0; |
| 604 | if (CONFIG_DV_DEMUXER) { |
| 605 | avi->dv_demux = avpriv_dv_init_demux(s); |
| 606 | if (!avi->dv_demux) |
| 607 | goto fail; |
| 608 | } else |
| 609 | goto fail; |
| 610 | s->streams[0]->priv_data = ast; |
| 611 | avio_skip(pb, 3 * 4); |
| 612 | ast->scale = avio_rl32(pb); |
| 613 | ast->rate = avio_rl32(pb); |
| 614 | avio_skip(pb, 4); /* start time */ |
| 615 | |
| 616 | dv_dur = avio_rl32(pb); |
| 617 | if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) { |
| 618 | dv_dur *= AV_TIME_BASE; |
| 619 | s->duration = av_rescale(dv_dur, ast->scale, ast->rate); |
| 620 | } |
| 621 | /* else, leave duration alone; timing estimation in utils.c |
| 622 | * will make a guess based on bitrate. */ |
| 623 | |
| 624 | stream_index = s->nb_streams - 1; |
| 625 | avio_skip(pb, size - 9 * 4); |
| 626 | break; |
| 627 | } |
| 628 | |
| 629 | av_assert0(stream_index < s->nb_streams); |
| 630 | st->codec->stream_codec_tag = handler; |
| 631 | |
| 632 | avio_rl32(pb); /* flags */ |
| 633 | avio_rl16(pb); /* priority */ |
| 634 | avio_rl16(pb); /* language */ |
| 635 | avio_rl32(pb); /* initial frame */ |
| 636 | ast->scale = avio_rl32(pb); |
| 637 | ast->rate = avio_rl32(pb); |
| 638 | if (!(ast->scale && ast->rate)) { |
| 639 | av_log(s, AV_LOG_WARNING, |
| 640 | "scale/rate is %"PRIu32"/%"PRIu32" which is invalid. " |
| 641 | "(This file has been generated by broken software.)\n", |
| 642 | ast->scale, |
| 643 | ast->rate); |
| 644 | if (frame_period) { |
| 645 | ast->rate = 1000000; |
| 646 | ast->scale = frame_period; |
| 647 | } else { |
| 648 | ast->rate = 25; |
| 649 | ast->scale = 1; |
| 650 | } |
| 651 | } |
| 652 | avpriv_set_pts_info(st, 64, ast->scale, ast->rate); |
| 653 | |
| 654 | ast->cum_len = avio_rl32(pb); /* start */ |
| 655 | st->nb_frames = avio_rl32(pb); |
| 656 | |
| 657 | st->start_time = 0; |
| 658 | avio_rl32(pb); /* buffer size */ |
| 659 | avio_rl32(pb); /* quality */ |
| 660 | if (ast->cum_len*ast->scale/ast->rate > 3600) { |
| 661 | av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n"); |
| 662 | return AVERROR_INVALIDDATA; |
| 663 | } |
| 664 | ast->sample_size = avio_rl32(pb); /* sample ssize */ |
| 665 | ast->cum_len *= FFMAX(1, ast->sample_size); |
| 666 | av_dlog(s, "%"PRIu32" %"PRIu32" %d\n", |
| 667 | ast->rate, ast->scale, ast->sample_size); |
| 668 | |
| 669 | switch (tag1) { |
| 670 | case MKTAG('v', 'i', 'd', 's'): |
| 671 | codec_type = AVMEDIA_TYPE_VIDEO; |
| 672 | |
| 673 | ast->sample_size = 0; |
| 674 | st->avg_frame_rate = av_inv_q(st->time_base); |
| 675 | break; |
| 676 | case MKTAG('a', 'u', 'd', 's'): |
| 677 | codec_type = AVMEDIA_TYPE_AUDIO; |
| 678 | break; |
| 679 | case MKTAG('t', 'x', 't', 's'): |
| 680 | codec_type = AVMEDIA_TYPE_SUBTITLE; |
| 681 | break; |
| 682 | case MKTAG('d', 'a', 't', 's'): |
| 683 | codec_type = AVMEDIA_TYPE_DATA; |
| 684 | break; |
| 685 | default: |
| 686 | av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1); |
| 687 | } |
| 688 | if (ast->sample_size == 0) { |
| 689 | st->duration = st->nb_frames; |
| 690 | if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) { |
| 691 | av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n"); |
| 692 | st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end); |
| 693 | } |
| 694 | } |
| 695 | ast->frame_offset = ast->cum_len; |
| 696 | avio_skip(pb, size - 12 * 4); |
| 697 | break; |
| 698 | case MKTAG('s', 't', 'r', 'f'): |
| 699 | /* stream header */ |
| 700 | if (!size) |
| 701 | break; |
| 702 | if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) { |
| 703 | avio_skip(pb, size); |
| 704 | } else { |
| 705 | uint64_t cur_pos = avio_tell(pb); |
| 706 | unsigned esize; |
| 707 | if (cur_pos < list_end) |
| 708 | size = FFMIN(size, list_end - cur_pos); |
| 709 | st = s->streams[stream_index]; |
| 710 | if (st->codec->codec_type != AVMEDIA_TYPE_UNKNOWN) { |
| 711 | avio_skip(pb, size); |
| 712 | break; |
| 713 | } |
| 714 | switch (codec_type) { |
| 715 | case AVMEDIA_TYPE_VIDEO: |
| 716 | if (amv_file_format) { |
| 717 | st->codec->width = avih_width; |
| 718 | st->codec->height = avih_height; |
| 719 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 720 | st->codec->codec_id = AV_CODEC_ID_AMV; |
| 721 | avio_skip(pb, size); |
| 722 | break; |
| 723 | } |
| 724 | tag1 = ff_get_bmp_header(pb, st, &esize); |
| 725 | |
| 726 | if (tag1 == MKTAG('D', 'X', 'S', 'B') || |
| 727 | tag1 == MKTAG('D', 'X', 'S', 'A')) { |
| 728 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
| 729 | st->codec->codec_tag = tag1; |
| 730 | st->codec->codec_id = AV_CODEC_ID_XSUB; |
| 731 | break; |
| 732 | } |
| 733 | |
| 734 | if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) { |
| 735 | if (esize == size-1 && (esize&1)) { |
| 736 | st->codec->extradata_size = esize - 10 * 4; |
| 737 | } else |
| 738 | st->codec->extradata_size = size - 10 * 4; |
| 739 | if (ff_get_extradata(st->codec, pb, st->codec->extradata_size) < 0) |
| 740 | return AVERROR(ENOMEM); |
| 741 | } |
| 742 | |
| 743 | // FIXME: check if the encoder really did this correctly |
| 744 | if (st->codec->extradata_size & 1) |
| 745 | avio_r8(pb); |
| 746 | |
| 747 | /* Extract palette from extradata if bpp <= 8. |
| 748 | * This code assumes that extradata contains only palette. |
| 749 | * This is true for all paletted codecs implemented in |
| 750 | * FFmpeg. */ |
| 751 | if (st->codec->extradata_size && |
| 752 | (st->codec->bits_per_coded_sample <= 8)) { |
| 753 | int pal_size = (1 << st->codec->bits_per_coded_sample) << 2; |
| 754 | const uint8_t *pal_src; |
| 755 | |
| 756 | pal_size = FFMIN(pal_size, st->codec->extradata_size); |
| 757 | pal_src = st->codec->extradata + |
| 758 | st->codec->extradata_size - pal_size; |
| 759 | /* Exclude the "BottomUp" field from the palette */ |
| 760 | if (pal_src - st->codec->extradata >= 9 && |
| 761 | !memcmp(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9)) |
| 762 | pal_src -= 9; |
| 763 | for (i = 0; i < pal_size / 4; i++) |
| 764 | ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i); |
| 765 | ast->has_pal = 1; |
| 766 | } |
| 767 | |
| 768 | print_tag("video", tag1, 0); |
| 769 | |
| 770 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 771 | st->codec->codec_tag = tag1; |
| 772 | st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, |
| 773 | tag1); |
| 774 | /* This is needed to get the pict type which is necessary |
| 775 | * for generating correct pts. */ |
| 776 | st->need_parsing = AVSTREAM_PARSE_HEADERS; |
| 777 | if (st->codec->codec_tag == MKTAG('V', 'S', 'S', 'H')) |
| 778 | st->need_parsing = AVSTREAM_PARSE_FULL; |
| 779 | |
| 780 | if (st->codec->codec_tag == 0 && st->codec->height > 0 && |
| 781 | st->codec->extradata_size < 1U << 30) { |
| 782 | st->codec->extradata_size += 9; |
| 783 | if ((ret = av_reallocp(&st->codec->extradata, |
| 784 | st->codec->extradata_size + |
| 785 | FF_INPUT_BUFFER_PADDING_SIZE)) < 0) { |
| 786 | st->codec->extradata_size = 0; |
| 787 | return ret; |
| 788 | } else |
| 789 | memcpy(st->codec->extradata + st->codec->extradata_size - 9, |
| 790 | "BottomUp", 9); |
| 791 | } |
| 792 | st->codec->height = FFABS(st->codec->height); |
| 793 | |
| 794 | // avio_skip(pb, size - 5 * 4); |
| 795 | break; |
| 796 | case AVMEDIA_TYPE_AUDIO: |
| 797 | ret = ff_get_wav_header(pb, st->codec, size); |
| 798 | if (ret < 0) |
| 799 | return ret; |
| 800 | ast->dshow_block_align = st->codec->block_align; |
| 801 | if (ast->sample_size && st->codec->block_align && |
| 802 | ast->sample_size != st->codec->block_align) { |
| 803 | av_log(s, |
| 804 | AV_LOG_WARNING, |
| 805 | "sample size (%d) != block align (%d)\n", |
| 806 | ast->sample_size, |
| 807 | st->codec->block_align); |
| 808 | ast->sample_size = st->codec->block_align; |
| 809 | } |
| 810 | /* 2-aligned |
| 811 | * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */ |
| 812 | if (size & 1) |
| 813 | avio_skip(pb, 1); |
| 814 | /* Force parsing as several audio frames can be in |
| 815 | * one packet and timestamps refer to packet start. */ |
| 816 | st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS; |
| 817 | /* ADTS header is in extradata, AAC without header must be |
| 818 | * stored as exact frames. Parser not needed and it will |
| 819 | * fail. */ |
| 820 | if (st->codec->codec_id == AV_CODEC_ID_AAC && |
| 821 | st->codec->extradata_size) |
| 822 | st->need_parsing = AVSTREAM_PARSE_NONE; |
| 823 | /* AVI files with Xan DPCM audio (wrongly) declare PCM |
| 824 | * audio in the header but have Axan as stream_code_tag. */ |
| 825 | if (st->codec->stream_codec_tag == AV_RL32("Axan")) { |
| 826 | st->codec->codec_id = AV_CODEC_ID_XAN_DPCM; |
| 827 | st->codec->codec_tag = 0; |
| 828 | ast->dshow_block_align = 0; |
| 829 | } |
| 830 | if (amv_file_format) { |
| 831 | st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV; |
| 832 | ast->dshow_block_align = 0; |
| 833 | } |
| 834 | if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align <= 4 && ast->dshow_block_align) { |
| 835 | av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align); |
| 836 | ast->dshow_block_align = 0; |
| 837 | } |
| 838 | if (st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 || |
| 839 | st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 || |
| 840 | st->codec->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) { |
| 841 | av_log(s, AV_LOG_DEBUG, "overriding sample_size\n"); |
| 842 | ast->sample_size = 0; |
| 843 | } |
| 844 | break; |
| 845 | case AVMEDIA_TYPE_SUBTITLE: |
| 846 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
| 847 | st->request_probe= 1; |
| 848 | avio_skip(pb, size); |
| 849 | break; |
| 850 | default: |
| 851 | st->codec->codec_type = AVMEDIA_TYPE_DATA; |
| 852 | st->codec->codec_id = AV_CODEC_ID_NONE; |
| 853 | st->codec->codec_tag = 0; |
| 854 | avio_skip(pb, size); |
| 855 | break; |
| 856 | } |
| 857 | } |
| 858 | break; |
| 859 | case MKTAG('s', 't', 'r', 'd'): |
| 860 | if (stream_index >= (unsigned)s->nb_streams |
| 861 | || s->streams[stream_index]->codec->extradata_size |
| 862 | || s->streams[stream_index]->codec->codec_tag == MKTAG('H','2','6','4')) { |
| 863 | avio_skip(pb, size); |
| 864 | } else { |
| 865 | uint64_t cur_pos = avio_tell(pb); |
| 866 | if (cur_pos < list_end) |
| 867 | size = FFMIN(size, list_end - cur_pos); |
| 868 | st = s->streams[stream_index]; |
| 869 | |
| 870 | if (size<(1<<30)) { |
| 871 | if (ff_get_extradata(st->codec, pb, size) < 0) |
| 872 | return AVERROR(ENOMEM); |
| 873 | } |
| 874 | |
| 875 | if (st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly |
| 876 | avio_r8(pb); |
| 877 | |
| 878 | ret = avi_extract_stream_metadata(st); |
| 879 | if (ret < 0) { |
| 880 | av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n"); |
| 881 | } |
| 882 | } |
| 883 | break; |
| 884 | case MKTAG('i', 'n', 'd', 'x'): |
| 885 | i = avio_tell(pb); |
| 886 | if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) && |
| 887 | avi->use_odml && |
| 888 | read_braindead_odml_indx(s, 0) < 0 && |
| 889 | (s->error_recognition & AV_EF_EXPLODE)) |
| 890 | goto fail; |
| 891 | avio_seek(pb, i + size, SEEK_SET); |
| 892 | break; |
| 893 | case MKTAG('v', 'p', 'r', 'p'): |
| 894 | if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) { |
| 895 | AVRational active, active_aspect; |
| 896 | |
| 897 | st = s->streams[stream_index]; |
| 898 | avio_rl32(pb); |
| 899 | avio_rl32(pb); |
| 900 | avio_rl32(pb); |
| 901 | avio_rl32(pb); |
| 902 | avio_rl32(pb); |
| 903 | |
| 904 | active_aspect.den = avio_rl16(pb); |
| 905 | active_aspect.num = avio_rl16(pb); |
| 906 | active.num = avio_rl32(pb); |
| 907 | active.den = avio_rl32(pb); |
| 908 | avio_rl32(pb); // nbFieldsPerFrame |
| 909 | |
| 910 | if (active_aspect.num && active_aspect.den && |
| 911 | active.num && active.den) { |
| 912 | st->sample_aspect_ratio = av_div_q(active_aspect, active); |
| 913 | av_dlog(s, "vprp %d/%d %d/%d\n", |
| 914 | active_aspect.num, active_aspect.den, |
| 915 | active.num, active.den); |
| 916 | } |
| 917 | size -= 9 * 4; |
| 918 | } |
| 919 | avio_skip(pb, size); |
| 920 | break; |
| 921 | case MKTAG('s', 't', 'r', 'n'): |
| 922 | if (s->nb_streams) { |
| 923 | ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size); |
| 924 | if (ret < 0) |
| 925 | return ret; |
| 926 | break; |
| 927 | } |
| 928 | default: |
| 929 | if (size > 1000000) { |
| 930 | av_log(s, AV_LOG_ERROR, |
| 931 | "Something went wrong during header parsing, " |
| 932 | "I will ignore it and try to continue anyway.\n"); |
| 933 | if (s->error_recognition & AV_EF_EXPLODE) |
| 934 | goto fail; |
| 935 | avi->movi_list = avio_tell(pb) - 4; |
| 936 | avi->movi_end = avi->fsize; |
| 937 | goto end_of_header; |
| 938 | } |
| 939 | /* skip tag */ |
| 940 | size += (size & 1); |
| 941 | avio_skip(pb, size); |
| 942 | break; |
| 943 | } |
| 944 | } |
| 945 | |
| 946 | end_of_header: |
| 947 | /* check stream number */ |
| 948 | if (stream_index != s->nb_streams - 1) { |
| 949 | |
| 950 | fail: |
| 951 | return AVERROR_INVALIDDATA; |
| 952 | } |
| 953 | |
| 954 | if (!avi->index_loaded && pb->seekable) |
| 955 | avi_load_index(s); |
| 956 | calculate_bitrate(s); |
| 957 | avi->index_loaded |= 1; |
| 958 | |
| 959 | if ((ret = guess_ni_flag(s)) < 0) |
| 960 | return ret; |
| 961 | |
| 962 | avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS); |
| 963 | |
| 964 | dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0); |
| 965 | if (dict_entry && !strcmp(dict_entry->value, "PotEncoder")) |
| 966 | for (i = 0; i < s->nb_streams; i++) { |
| 967 | AVStream *st = s->streams[i]; |
| 968 | if ( st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO |
| 969 | || st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO) |
| 970 | st->need_parsing = AVSTREAM_PARSE_FULL; |
| 971 | } |
| 972 | |
| 973 | for (i = 0; i < s->nb_streams; i++) { |
| 974 | AVStream *st = s->streams[i]; |
| 975 | if (st->nb_index_entries) |
| 976 | break; |
| 977 | } |
| 978 | // DV-in-AVI cannot be non-interleaved, if set this must be |
| 979 | // a mis-detection. |
| 980 | if (avi->dv_demux) |
| 981 | avi->non_interleaved = 0; |
| 982 | if (i == s->nb_streams && avi->non_interleaved) { |
| 983 | av_log(s, AV_LOG_WARNING, |
| 984 | "Non-interleaved AVI without index, switching to interleaved\n"); |
| 985 | avi->non_interleaved = 0; |
| 986 | } |
| 987 | |
| 988 | if (avi->non_interleaved) { |
| 989 | av_log(s, AV_LOG_INFO, "non-interleaved AVI\n"); |
| 990 | clean_index(s); |
| 991 | } |
| 992 | |
| 993 | ff_metadata_conv_ctx(s, NULL, avi_metadata_conv); |
| 994 | ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv); |
| 995 | |
| 996 | return 0; |
| 997 | } |
| 998 | |
| 999 | static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt) |
| 1000 | { |
| 1001 | if (pkt->size >= 7 && |
| 1002 | pkt->size < INT_MAX - AVPROBE_PADDING_SIZE && |
| 1003 | !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) { |
| 1004 | uint8_t desc[256]; |
| 1005 | int score = AVPROBE_SCORE_EXTENSION, ret; |
| 1006 | AVIStream *ast = st->priv_data; |
| 1007 | AVInputFormat *sub_demuxer; |
| 1008 | AVRational time_base; |
| 1009 | int size; |
| 1010 | AVIOContext *pb = avio_alloc_context(pkt->data + 7, |
| 1011 | pkt->size - 7, |
| 1012 | 0, NULL, NULL, NULL, NULL); |
| 1013 | AVProbeData pd; |
| 1014 | unsigned int desc_len = avio_rl32(pb); |
| 1015 | |
| 1016 | if (desc_len > pb->buf_end - pb->buf_ptr) |
| 1017 | goto error; |
| 1018 | |
| 1019 | ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc)); |
| 1020 | avio_skip(pb, desc_len - ret); |
| 1021 | if (*desc) |
| 1022 | av_dict_set(&st->metadata, "title", desc, 0); |
| 1023 | |
| 1024 | avio_rl16(pb); /* flags? */ |
| 1025 | avio_rl32(pb); /* data size */ |
| 1026 | |
| 1027 | size = pb->buf_end - pb->buf_ptr; |
| 1028 | pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE), |
| 1029 | .buf_size = size }; |
| 1030 | if (!pd.buf) |
| 1031 | goto error; |
| 1032 | memcpy(pd.buf, pb->buf_ptr, size); |
| 1033 | sub_demuxer = av_probe_input_format2(&pd, 1, &score); |
| 1034 | av_freep(&pd.buf); |
| 1035 | if (!sub_demuxer) |
| 1036 | goto error; |
| 1037 | |
| 1038 | if (!(ast->sub_ctx = avformat_alloc_context())) |
| 1039 | goto error; |
| 1040 | |
| 1041 | ast->sub_ctx->pb = pb; |
| 1042 | |
| 1043 | if (ff_copy_whitelists(ast->sub_ctx, s) < 0) |
| 1044 | goto error; |
| 1045 | |
| 1046 | if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) { |
| 1047 | ff_read_packet(ast->sub_ctx, &ast->sub_pkt); |
| 1048 | *st->codec = *ast->sub_ctx->streams[0]->codec; |
| 1049 | ast->sub_ctx->streams[0]->codec->extradata = NULL; |
| 1050 | time_base = ast->sub_ctx->streams[0]->time_base; |
| 1051 | avpriv_set_pts_info(st, 64, time_base.num, time_base.den); |
| 1052 | } |
| 1053 | ast->sub_buffer = pkt->data; |
| 1054 | memset(pkt, 0, sizeof(*pkt)); |
| 1055 | return 1; |
| 1056 | |
| 1057 | error: |
| 1058 | av_freep(&ast->sub_ctx); |
| 1059 | av_freep(&pb); |
| 1060 | } |
| 1061 | return 0; |
| 1062 | } |
| 1063 | |
| 1064 | static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st, |
| 1065 | AVPacket *pkt) |
| 1066 | { |
| 1067 | AVIStream *ast, *next_ast = next_st->priv_data; |
| 1068 | int64_t ts, next_ts, ts_min = INT64_MAX; |
| 1069 | AVStream *st, *sub_st = NULL; |
| 1070 | int i; |
| 1071 | |
| 1072 | next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base, |
| 1073 | AV_TIME_BASE_Q); |
| 1074 | |
| 1075 | for (i = 0; i < s->nb_streams; i++) { |
| 1076 | st = s->streams[i]; |
| 1077 | ast = st->priv_data; |
| 1078 | if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) { |
| 1079 | ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q); |
| 1080 | if (ts <= next_ts && ts < ts_min) { |
| 1081 | ts_min = ts; |
| 1082 | sub_st = st; |
| 1083 | } |
| 1084 | } |
| 1085 | } |
| 1086 | |
| 1087 | if (sub_st) { |
| 1088 | ast = sub_st->priv_data; |
| 1089 | *pkt = ast->sub_pkt; |
| 1090 | pkt->stream_index = sub_st->index; |
| 1091 | |
| 1092 | if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0) |
| 1093 | ast->sub_pkt.data = NULL; |
| 1094 | } |
| 1095 | return sub_st; |
| 1096 | } |
| 1097 | |
| 1098 | static int get_stream_idx(const unsigned *d) |
| 1099 | { |
| 1100 | if (d[0] >= '0' && d[0] <= '9' && |
| 1101 | d[1] >= '0' && d[1] <= '9') { |
| 1102 | return (d[0] - '0') * 10 + (d[1] - '0'); |
| 1103 | } else { |
| 1104 | return 100; // invalid stream ID |
| 1105 | } |
| 1106 | } |
| 1107 | |
| 1108 | /** |
| 1109 | * |
| 1110 | * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet |
| 1111 | */ |
| 1112 | static int avi_sync(AVFormatContext *s, int exit_early) |
| 1113 | { |
| 1114 | AVIContext *avi = s->priv_data; |
| 1115 | AVIOContext *pb = s->pb; |
| 1116 | int n; |
| 1117 | unsigned int d[8]; |
| 1118 | unsigned int size; |
| 1119 | int64_t i, sync; |
| 1120 | |
| 1121 | start_sync: |
| 1122 | memset(d, -1, sizeof(d)); |
| 1123 | for (i = sync = avio_tell(pb); !avio_feof(pb); i++) { |
| 1124 | int j; |
| 1125 | |
| 1126 | for (j = 0; j < 7; j++) |
| 1127 | d[j] = d[j + 1]; |
| 1128 | d[7] = avio_r8(pb); |
| 1129 | |
| 1130 | size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24); |
| 1131 | |
| 1132 | n = get_stream_idx(d + 2); |
| 1133 | av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n", |
| 1134 | d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n); |
| 1135 | if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127) |
| 1136 | continue; |
| 1137 | |
| 1138 | // parse ix## |
| 1139 | if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) || |
| 1140 | // parse JUNK |
| 1141 | (d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') || |
| 1142 | (d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) { |
| 1143 | avio_skip(pb, size); |
| 1144 | goto start_sync; |
| 1145 | } |
| 1146 | |
| 1147 | // parse stray LIST |
| 1148 | if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') { |
| 1149 | avio_skip(pb, 4); |
| 1150 | goto start_sync; |
| 1151 | } |
| 1152 | |
| 1153 | n = get_stream_idx(d); |
| 1154 | |
| 1155 | if (!((i - avi->last_pkt_pos) & 1) && |
| 1156 | get_stream_idx(d + 1) < s->nb_streams) |
| 1157 | continue; |
| 1158 | |
| 1159 | // detect ##ix chunk and skip |
| 1160 | if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) { |
| 1161 | avio_skip(pb, size); |
| 1162 | goto start_sync; |
| 1163 | } |
| 1164 | |
| 1165 | if (avi->dv_demux && n != 0) |
| 1166 | continue; |
| 1167 | |
| 1168 | // parse ##dc/##wb |
| 1169 | if (n < s->nb_streams) { |
| 1170 | AVStream *st; |
| 1171 | AVIStream *ast; |
| 1172 | st = s->streams[n]; |
| 1173 | ast = st->priv_data; |
| 1174 | |
| 1175 | if (!ast) { |
| 1176 | av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n); |
| 1177 | continue; |
| 1178 | } |
| 1179 | |
| 1180 | if (s->nb_streams >= 2) { |
| 1181 | AVStream *st1 = s->streams[1]; |
| 1182 | AVIStream *ast1 = st1->priv_data; |
| 1183 | // workaround for broken small-file-bug402.avi |
| 1184 | if ( d[2] == 'w' && d[3] == 'b' |
| 1185 | && n == 0 |
| 1186 | && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO |
| 1187 | && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO |
| 1188 | && ast->prefix == 'd'*256+'c' |
| 1189 | && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count) |
| 1190 | ) { |
| 1191 | n = 1; |
| 1192 | st = st1; |
| 1193 | ast = ast1; |
| 1194 | av_log(s, AV_LOG_WARNING, |
| 1195 | "Invalid stream + prefix combination, assuming audio.\n"); |
| 1196 | } |
| 1197 | } |
| 1198 | |
| 1199 | if (!avi->dv_demux && |
| 1200 | ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* || |
| 1201 | // FIXME: needs a little reordering |
| 1202 | (st->discard >= AVDISCARD_NONKEY && |
| 1203 | !(pkt->flags & AV_PKT_FLAG_KEY)) */ |
| 1204 | || st->discard >= AVDISCARD_ALL)) { |
| 1205 | if (!exit_early) { |
| 1206 | ast->frame_offset += get_duration(ast, size); |
| 1207 | avio_skip(pb, size); |
| 1208 | goto start_sync; |
| 1209 | } |
| 1210 | } |
| 1211 | |
| 1212 | if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) { |
| 1213 | int k = avio_r8(pb); |
| 1214 | int last = (k + avio_r8(pb) - 1) & 0xFF; |
| 1215 | |
| 1216 | avio_rl16(pb); // flags |
| 1217 | |
| 1218 | // b + (g << 8) + (r << 16); |
| 1219 | for (; k <= last; k++) |
| 1220 | ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8; |
| 1221 | |
| 1222 | ast->has_pal = 1; |
| 1223 | goto start_sync; |
| 1224 | } else if (((ast->prefix_count < 5 || sync + 9 > i) && |
| 1225 | d[2] < 128 && d[3] < 128) || |
| 1226 | d[2] * 256 + d[3] == ast->prefix /* || |
| 1227 | (d[2] == 'd' && d[3] == 'c') || |
| 1228 | (d[2] == 'w' && d[3] == 'b') */) { |
| 1229 | if (exit_early) |
| 1230 | return 0; |
| 1231 | if (d[2] * 256 + d[3] == ast->prefix) |
| 1232 | ast->prefix_count++; |
| 1233 | else { |
| 1234 | ast->prefix = d[2] * 256 + d[3]; |
| 1235 | ast->prefix_count = 0; |
| 1236 | } |
| 1237 | |
| 1238 | avi->stream_index = n; |
| 1239 | ast->packet_size = size + 8; |
| 1240 | ast->remaining = size; |
| 1241 | |
| 1242 | if (size) { |
| 1243 | uint64_t pos = avio_tell(pb) - 8; |
| 1244 | if (!st->index_entries || !st->nb_index_entries || |
| 1245 | st->index_entries[st->nb_index_entries - 1].pos < pos) { |
| 1246 | av_add_index_entry(st, pos, ast->frame_offset, size, |
| 1247 | 0, AVINDEX_KEYFRAME); |
| 1248 | } |
| 1249 | } |
| 1250 | return 0; |
| 1251 | } |
| 1252 | } |
| 1253 | } |
| 1254 | |
| 1255 | if (pb->error) |
| 1256 | return pb->error; |
| 1257 | return AVERROR_EOF; |
| 1258 | } |
| 1259 | |
| 1260 | static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 1261 | { |
| 1262 | AVIContext *avi = s->priv_data; |
| 1263 | AVIOContext *pb = s->pb; |
| 1264 | int err; |
| 1265 | #if FF_API_DESTRUCT_PACKET |
| 1266 | void *dstr; |
| 1267 | #endif |
| 1268 | |
| 1269 | if (CONFIG_DV_DEMUXER && avi->dv_demux) { |
| 1270 | int size = avpriv_dv_get_packet(avi->dv_demux, pkt); |
| 1271 | if (size >= 0) |
| 1272 | return size; |
| 1273 | else |
| 1274 | goto resync; |
| 1275 | } |
| 1276 | |
| 1277 | if (avi->non_interleaved) { |
| 1278 | int best_stream_index = 0; |
| 1279 | AVStream *best_st = NULL; |
| 1280 | AVIStream *best_ast; |
| 1281 | int64_t best_ts = INT64_MAX; |
| 1282 | int i; |
| 1283 | |
| 1284 | for (i = 0; i < s->nb_streams; i++) { |
| 1285 | AVStream *st = s->streams[i]; |
| 1286 | AVIStream *ast = st->priv_data; |
| 1287 | int64_t ts = ast->frame_offset; |
| 1288 | int64_t last_ts; |
| 1289 | |
| 1290 | if (!st->nb_index_entries) |
| 1291 | continue; |
| 1292 | |
| 1293 | last_ts = st->index_entries[st->nb_index_entries - 1].timestamp; |
| 1294 | if (!ast->remaining && ts > last_ts) |
| 1295 | continue; |
| 1296 | |
| 1297 | ts = av_rescale_q(ts, st->time_base, |
| 1298 | (AVRational) { FFMAX(1, ast->sample_size), |
| 1299 | AV_TIME_BASE }); |
| 1300 | |
| 1301 | av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts, |
| 1302 | st->time_base.num, st->time_base.den, ast->frame_offset); |
| 1303 | if (ts < best_ts) { |
| 1304 | best_ts = ts; |
| 1305 | best_st = st; |
| 1306 | best_stream_index = i; |
| 1307 | } |
| 1308 | } |
| 1309 | if (!best_st) |
| 1310 | return AVERROR_EOF; |
| 1311 | |
| 1312 | best_ast = best_st->priv_data; |
| 1313 | best_ts = best_ast->frame_offset; |
| 1314 | if (best_ast->remaining) { |
| 1315 | i = av_index_search_timestamp(best_st, |
| 1316 | best_ts, |
| 1317 | AVSEEK_FLAG_ANY | |
| 1318 | AVSEEK_FLAG_BACKWARD); |
| 1319 | } else { |
| 1320 | i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY); |
| 1321 | if (i >= 0) |
| 1322 | best_ast->frame_offset = best_st->index_entries[i].timestamp; |
| 1323 | } |
| 1324 | |
| 1325 | if (i >= 0) { |
| 1326 | int64_t pos = best_st->index_entries[i].pos; |
| 1327 | pos += best_ast->packet_size - best_ast->remaining; |
| 1328 | if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0) |
| 1329 | return AVERROR_EOF; |
| 1330 | |
| 1331 | av_assert0(best_ast->remaining <= best_ast->packet_size); |
| 1332 | |
| 1333 | avi->stream_index = best_stream_index; |
| 1334 | if (!best_ast->remaining) |
| 1335 | best_ast->packet_size = |
| 1336 | best_ast->remaining = best_st->index_entries[i].size; |
| 1337 | } |
| 1338 | else |
| 1339 | return AVERROR_EOF; |
| 1340 | } |
| 1341 | |
| 1342 | resync: |
| 1343 | if (avi->stream_index >= 0) { |
| 1344 | AVStream *st = s->streams[avi->stream_index]; |
| 1345 | AVIStream *ast = st->priv_data; |
| 1346 | int size, err; |
| 1347 | |
| 1348 | if (get_subtitle_pkt(s, st, pkt)) |
| 1349 | return 0; |
| 1350 | |
| 1351 | // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM |
| 1352 | if (ast->sample_size <= 1) |
| 1353 | size = INT_MAX; |
| 1354 | else if (ast->sample_size < 32) |
| 1355 | // arbitrary multiplier to avoid tiny packets for raw PCM data |
| 1356 | size = 1024 * ast->sample_size; |
| 1357 | else |
| 1358 | size = ast->sample_size; |
| 1359 | |
| 1360 | if (size > ast->remaining) |
| 1361 | size = ast->remaining; |
| 1362 | avi->last_pkt_pos = avio_tell(pb); |
| 1363 | err = av_get_packet(pb, pkt, size); |
| 1364 | if (err < 0) |
| 1365 | return err; |
| 1366 | size = err; |
| 1367 | |
| 1368 | if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2) { |
| 1369 | uint8_t *pal; |
| 1370 | pal = av_packet_new_side_data(pkt, |
| 1371 | AV_PKT_DATA_PALETTE, |
| 1372 | AVPALETTE_SIZE); |
| 1373 | if (!pal) { |
| 1374 | av_log(s, AV_LOG_ERROR, |
| 1375 | "Failed to allocate data for palette\n"); |
| 1376 | } else { |
| 1377 | memcpy(pal, ast->pal, AVPALETTE_SIZE); |
| 1378 | ast->has_pal = 0; |
| 1379 | } |
| 1380 | } |
| 1381 | |
| 1382 | if (CONFIG_DV_DEMUXER && avi->dv_demux) { |
| 1383 | AVBufferRef *avbuf = pkt->buf; |
| 1384 | #if FF_API_DESTRUCT_PACKET |
| 1385 | FF_DISABLE_DEPRECATION_WARNINGS |
| 1386 | dstr = pkt->destruct; |
| 1387 | FF_ENABLE_DEPRECATION_WARNINGS |
| 1388 | #endif |
| 1389 | size = avpriv_dv_produce_packet(avi->dv_demux, pkt, |
| 1390 | pkt->data, pkt->size, pkt->pos); |
| 1391 | #if FF_API_DESTRUCT_PACKET |
| 1392 | FF_DISABLE_DEPRECATION_WARNINGS |
| 1393 | pkt->destruct = dstr; |
| 1394 | FF_ENABLE_DEPRECATION_WARNINGS |
| 1395 | #endif |
| 1396 | pkt->buf = avbuf; |
| 1397 | pkt->flags |= AV_PKT_FLAG_KEY; |
| 1398 | if (size < 0) |
| 1399 | av_free_packet(pkt); |
| 1400 | } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE && |
| 1401 | !st->codec->codec_tag && read_gab2_sub(s, st, pkt)) { |
| 1402 | ast->frame_offset++; |
| 1403 | avi->stream_index = -1; |
| 1404 | ast->remaining = 0; |
| 1405 | goto resync; |
| 1406 | } else { |
| 1407 | /* XXX: How to handle B-frames in AVI? */ |
| 1408 | pkt->dts = ast->frame_offset; |
| 1409 | // pkt->dts += ast->start; |
| 1410 | if (ast->sample_size) |
| 1411 | pkt->dts /= ast->sample_size; |
| 1412 | av_dlog(s, |
| 1413 | "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d " |
| 1414 | "base:%d st:%d size:%d\n", |
| 1415 | pkt->dts, |
| 1416 | ast->frame_offset, |
| 1417 | ast->scale, |
| 1418 | ast->rate, |
| 1419 | ast->sample_size, |
| 1420 | AV_TIME_BASE, |
| 1421 | avi->stream_index, |
| 1422 | size); |
| 1423 | pkt->stream_index = avi->stream_index; |
| 1424 | |
| 1425 | if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) { |
| 1426 | AVIndexEntry *e; |
| 1427 | int index; |
| 1428 | |
| 1429 | index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY); |
| 1430 | e = &st->index_entries[index]; |
| 1431 | |
| 1432 | if (index >= 0 && e->timestamp == ast->frame_offset) { |
| 1433 | if (index == st->nb_index_entries-1) { |
| 1434 | int key=1; |
| 1435 | int i; |
| 1436 | uint32_t state=-1; |
| 1437 | for (i=0; i<FFMIN(size,256); i++) { |
| 1438 | if (st->codec->codec_id == AV_CODEC_ID_MPEG4) { |
| 1439 | if (state == 0x1B6) { |
| 1440 | key= !(pkt->data[i]&0xC0); |
| 1441 | break; |
| 1442 | } |
| 1443 | }else |
| 1444 | break; |
| 1445 | state= (state<<8) + pkt->data[i]; |
| 1446 | } |
| 1447 | if (!key) |
| 1448 | e->flags &= ~AVINDEX_KEYFRAME; |
| 1449 | } |
| 1450 | if (e->flags & AVINDEX_KEYFRAME) |
| 1451 | pkt->flags |= AV_PKT_FLAG_KEY; |
| 1452 | } |
| 1453 | } else { |
| 1454 | pkt->flags |= AV_PKT_FLAG_KEY; |
| 1455 | } |
| 1456 | ast->frame_offset += get_duration(ast, pkt->size); |
| 1457 | } |
| 1458 | ast->remaining -= err; |
| 1459 | if (!ast->remaining) { |
| 1460 | avi->stream_index = -1; |
| 1461 | ast->packet_size = 0; |
| 1462 | } |
| 1463 | |
| 1464 | if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) { |
| 1465 | av_free_packet(pkt); |
| 1466 | goto resync; |
| 1467 | } |
| 1468 | ast->seek_pos= 0; |
| 1469 | |
| 1470 | if (!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1) { |
| 1471 | int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q); |
| 1472 | |
| 1473 | if (avi->dts_max - dts > 2*AV_TIME_BASE) { |
| 1474 | avi->non_interleaved= 1; |
| 1475 | av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n"); |
| 1476 | }else if (avi->dts_max < dts) |
| 1477 | avi->dts_max = dts; |
| 1478 | } |
| 1479 | |
| 1480 | return 0; |
| 1481 | } |
| 1482 | |
| 1483 | if ((err = avi_sync(s, 0)) < 0) |
| 1484 | return err; |
| 1485 | goto resync; |
| 1486 | } |
| 1487 | |
| 1488 | /* XXX: We make the implicit supposition that the positions are sorted |
| 1489 | * for each stream. */ |
| 1490 | static int avi_read_idx1(AVFormatContext *s, int size) |
| 1491 | { |
| 1492 | AVIContext *avi = s->priv_data; |
| 1493 | AVIOContext *pb = s->pb; |
| 1494 | int nb_index_entries, i; |
| 1495 | AVStream *st; |
| 1496 | AVIStream *ast; |
| 1497 | unsigned int index, tag, flags, pos, len, first_packet = 1; |
| 1498 | unsigned last_pos = -1; |
| 1499 | unsigned last_idx = -1; |
| 1500 | int64_t idx1_pos, first_packet_pos = 0, data_offset = 0; |
| 1501 | int anykey = 0; |
| 1502 | |
| 1503 | nb_index_entries = size / 16; |
| 1504 | if (nb_index_entries <= 0) |
| 1505 | return AVERROR_INVALIDDATA; |
| 1506 | |
| 1507 | idx1_pos = avio_tell(pb); |
| 1508 | avio_seek(pb, avi->movi_list + 4, SEEK_SET); |
| 1509 | if (avi_sync(s, 1) == 0) |
| 1510 | first_packet_pos = avio_tell(pb) - 8; |
| 1511 | avi->stream_index = -1; |
| 1512 | avio_seek(pb, idx1_pos, SEEK_SET); |
| 1513 | |
| 1514 | if (s->nb_streams == 1 && s->streams[0]->codec->codec_tag == AV_RL32("MMES")) { |
| 1515 | first_packet_pos = 0; |
| 1516 | data_offset = avi->movi_list; |
| 1517 | } |
| 1518 | |
| 1519 | /* Read the entries and sort them in each stream component. */ |
| 1520 | for (i = 0; i < nb_index_entries; i++) { |
| 1521 | if (avio_feof(pb)) |
| 1522 | return -1; |
| 1523 | |
| 1524 | tag = avio_rl32(pb); |
| 1525 | flags = avio_rl32(pb); |
| 1526 | pos = avio_rl32(pb); |
| 1527 | len = avio_rl32(pb); |
| 1528 | av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/", |
| 1529 | i, tag, flags, pos, len); |
| 1530 | |
| 1531 | index = ((tag & 0xff) - '0') * 10; |
| 1532 | index += (tag >> 8 & 0xff) - '0'; |
| 1533 | if (index >= s->nb_streams) |
| 1534 | continue; |
| 1535 | st = s->streams[index]; |
| 1536 | ast = st->priv_data; |
| 1537 | |
| 1538 | if (first_packet && first_packet_pos) { |
| 1539 | data_offset = first_packet_pos - pos; |
| 1540 | first_packet = 0; |
| 1541 | } |
| 1542 | pos += data_offset; |
| 1543 | |
| 1544 | av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len); |
| 1545 | |
| 1546 | // even if we have only a single stream, we should |
| 1547 | // switch to non-interleaved to get correct timestamps |
| 1548 | if (last_pos == pos) |
| 1549 | avi->non_interleaved = 1; |
| 1550 | if (last_idx != pos && len) { |
| 1551 | av_add_index_entry(st, pos, ast->cum_len, len, 0, |
| 1552 | (flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0); |
| 1553 | last_idx= pos; |
| 1554 | } |
| 1555 | ast->cum_len += get_duration(ast, len); |
| 1556 | last_pos = pos; |
| 1557 | anykey |= flags&AVIIF_INDEX; |
| 1558 | } |
| 1559 | if (!anykey) { |
| 1560 | for (index = 0; index < s->nb_streams; index++) { |
| 1561 | st = s->streams[index]; |
| 1562 | if (st->nb_index_entries) |
| 1563 | st->index_entries[0].flags |= AVINDEX_KEYFRAME; |
| 1564 | } |
| 1565 | } |
| 1566 | return 0; |
| 1567 | } |
| 1568 | |
| 1569 | /* Scan the index and consider any file with streams more than |
| 1570 | * 2 seconds or 64MB apart non-interleaved. */ |
| 1571 | static int check_stream_max_drift(AVFormatContext *s) |
| 1572 | { |
| 1573 | int64_t min_pos, pos; |
| 1574 | int i; |
| 1575 | int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx)); |
| 1576 | if (!idx) |
| 1577 | return AVERROR(ENOMEM); |
| 1578 | for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) { |
| 1579 | int64_t max_dts = INT64_MIN / 2; |
| 1580 | int64_t min_dts = INT64_MAX / 2; |
| 1581 | int64_t max_buffer = 0; |
| 1582 | |
| 1583 | min_pos = INT64_MAX; |
| 1584 | |
| 1585 | for (i = 0; i < s->nb_streams; i++) { |
| 1586 | AVStream *st = s->streams[i]; |
| 1587 | AVIStream *ast = st->priv_data; |
| 1588 | int n = st->nb_index_entries; |
| 1589 | while (idx[i] < n && st->index_entries[idx[i]].pos < pos) |
| 1590 | idx[i]++; |
| 1591 | if (idx[i] < n) { |
| 1592 | int64_t dts; |
| 1593 | dts = av_rescale_q(st->index_entries[idx[i]].timestamp / |
| 1594 | FFMAX(ast->sample_size, 1), |
| 1595 | st->time_base, AV_TIME_BASE_Q); |
| 1596 | min_dts = FFMIN(min_dts, dts); |
| 1597 | min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos); |
| 1598 | } |
| 1599 | } |
| 1600 | for (i = 0; i < s->nb_streams; i++) { |
| 1601 | AVStream *st = s->streams[i]; |
| 1602 | AVIStream *ast = st->priv_data; |
| 1603 | |
| 1604 | if (idx[i] && min_dts != INT64_MAX / 2) { |
| 1605 | int64_t dts; |
| 1606 | dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp / |
| 1607 | FFMAX(ast->sample_size, 1), |
| 1608 | st->time_base, AV_TIME_BASE_Q); |
| 1609 | max_dts = FFMAX(max_dts, dts); |
| 1610 | max_buffer = FFMAX(max_buffer, |
| 1611 | av_rescale(dts - min_dts, |
| 1612 | st->codec->bit_rate, |
| 1613 | AV_TIME_BASE)); |
| 1614 | } |
| 1615 | } |
| 1616 | if (max_dts - min_dts > 2 * AV_TIME_BASE || |
| 1617 | max_buffer > 1024 * 1024 * 8 * 8) { |
| 1618 | av_free(idx); |
| 1619 | return 1; |
| 1620 | } |
| 1621 | } |
| 1622 | av_free(idx); |
| 1623 | return 0; |
| 1624 | } |
| 1625 | |
| 1626 | static int guess_ni_flag(AVFormatContext *s) |
| 1627 | { |
| 1628 | int i; |
| 1629 | int64_t last_start = 0; |
| 1630 | int64_t first_end = INT64_MAX; |
| 1631 | int64_t oldpos = avio_tell(s->pb); |
| 1632 | |
| 1633 | for (i = 0; i < s->nb_streams; i++) { |
| 1634 | AVStream *st = s->streams[i]; |
| 1635 | int n = st->nb_index_entries; |
| 1636 | unsigned int size; |
| 1637 | |
| 1638 | if (n <= 0) |
| 1639 | continue; |
| 1640 | |
| 1641 | if (n >= 2) { |
| 1642 | int64_t pos = st->index_entries[0].pos; |
| 1643 | avio_seek(s->pb, pos + 4, SEEK_SET); |
| 1644 | size = avio_rl32(s->pb); |
| 1645 | if (pos + size > st->index_entries[1].pos) |
| 1646 | last_start = INT64_MAX; |
| 1647 | } |
| 1648 | |
| 1649 | if (st->index_entries[0].pos > last_start) |
| 1650 | last_start = st->index_entries[0].pos; |
| 1651 | if (st->index_entries[n - 1].pos < first_end) |
| 1652 | first_end = st->index_entries[n - 1].pos; |
| 1653 | } |
| 1654 | avio_seek(s->pb, oldpos, SEEK_SET); |
| 1655 | |
| 1656 | if (last_start > first_end) |
| 1657 | return 1; |
| 1658 | |
| 1659 | return check_stream_max_drift(s); |
| 1660 | } |
| 1661 | |
| 1662 | static int avi_load_index(AVFormatContext *s) |
| 1663 | { |
| 1664 | AVIContext *avi = s->priv_data; |
| 1665 | AVIOContext *pb = s->pb; |
| 1666 | uint32_t tag, size; |
| 1667 | int64_t pos = avio_tell(pb); |
| 1668 | int64_t next; |
| 1669 | int ret = -1; |
| 1670 | |
| 1671 | if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0) |
| 1672 | goto the_end; // maybe truncated file |
| 1673 | av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end); |
| 1674 | for (;;) { |
| 1675 | tag = avio_rl32(pb); |
| 1676 | size = avio_rl32(pb); |
| 1677 | if (avio_feof(pb)) |
| 1678 | break; |
| 1679 | next = avio_tell(pb) + size + (size & 1); |
| 1680 | |
| 1681 | av_dlog(s, "tag=%c%c%c%c size=0x%x\n", |
| 1682 | tag & 0xff, |
| 1683 | (tag >> 8) & 0xff, |
| 1684 | (tag >> 16) & 0xff, |
| 1685 | (tag >> 24) & 0xff, |
| 1686 | size); |
| 1687 | |
| 1688 | if (tag == MKTAG('i', 'd', 'x', '1') && |
| 1689 | avi_read_idx1(s, size) >= 0) { |
| 1690 | avi->index_loaded=2; |
| 1691 | ret = 0; |
| 1692 | }else if (tag == MKTAG('L', 'I', 'S', 'T')) { |
| 1693 | uint32_t tag1 = avio_rl32(pb); |
| 1694 | |
| 1695 | if (tag1 == MKTAG('I', 'N', 'F', 'O')) |
| 1696 | ff_read_riff_info(s, size - 4); |
| 1697 | }else if (!ret) |
| 1698 | break; |
| 1699 | |
| 1700 | if (avio_seek(pb, next, SEEK_SET) < 0) |
| 1701 | break; // something is wrong here |
| 1702 | } |
| 1703 | |
| 1704 | the_end: |
| 1705 | avio_seek(pb, pos, SEEK_SET); |
| 1706 | return ret; |
| 1707 | } |
| 1708 | |
| 1709 | static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp) |
| 1710 | { |
| 1711 | AVIStream *ast2 = st2->priv_data; |
| 1712 | int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base); |
| 1713 | av_free_packet(&ast2->sub_pkt); |
| 1714 | if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 || |
| 1715 | avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0) |
| 1716 | ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt); |
| 1717 | } |
| 1718 | |
| 1719 | static int avi_read_seek(AVFormatContext *s, int stream_index, |
| 1720 | int64_t timestamp, int flags) |
| 1721 | { |
| 1722 | AVIContext *avi = s->priv_data; |
| 1723 | AVStream *st; |
| 1724 | int i, index; |
| 1725 | int64_t pos, pos_min; |
| 1726 | AVIStream *ast; |
| 1727 | |
| 1728 | /* Does not matter which stream is requested dv in avi has the |
| 1729 | * stream information in the first video stream. |
| 1730 | */ |
| 1731 | if (avi->dv_demux) |
| 1732 | stream_index = 0; |
| 1733 | |
| 1734 | if (!avi->index_loaded) { |
| 1735 | /* we only load the index on demand */ |
| 1736 | avi_load_index(s); |
| 1737 | avi->index_loaded |= 1; |
| 1738 | } |
| 1739 | av_assert0(stream_index >= 0); |
| 1740 | |
| 1741 | st = s->streams[stream_index]; |
| 1742 | ast = st->priv_data; |
| 1743 | index = av_index_search_timestamp(st, |
| 1744 | timestamp * FFMAX(ast->sample_size, 1), |
| 1745 | flags); |
| 1746 | if (index < 0) { |
| 1747 | if (st->nb_index_entries > 0) |
| 1748 | av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n", |
| 1749 | timestamp * FFMAX(ast->sample_size, 1), |
| 1750 | st->index_entries[0].timestamp, |
| 1751 | st->index_entries[st->nb_index_entries - 1].timestamp); |
| 1752 | return AVERROR_INVALIDDATA; |
| 1753 | } |
| 1754 | |
| 1755 | /* find the position */ |
| 1756 | pos = st->index_entries[index].pos; |
| 1757 | timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1); |
| 1758 | |
| 1759 | av_dlog(s, "XX %"PRId64" %d %"PRId64"\n", |
| 1760 | timestamp, index, st->index_entries[index].timestamp); |
| 1761 | |
| 1762 | if (CONFIG_DV_DEMUXER && avi->dv_demux) { |
| 1763 | /* One and only one real stream for DV in AVI, and it has video */ |
| 1764 | /* offsets. Calling with other stream indexes should have failed */ |
| 1765 | /* the av_index_search_timestamp call above. */ |
| 1766 | |
| 1767 | if (avio_seek(s->pb, pos, SEEK_SET) < 0) |
| 1768 | return -1; |
| 1769 | |
| 1770 | /* Feed the DV video stream version of the timestamp to the */ |
| 1771 | /* DV demux so it can synthesize correct timestamps. */ |
| 1772 | ff_dv_offset_reset(avi->dv_demux, timestamp); |
| 1773 | |
| 1774 | avi->stream_index = -1; |
| 1775 | return 0; |
| 1776 | } |
| 1777 | |
| 1778 | pos_min = pos; |
| 1779 | for (i = 0; i < s->nb_streams; i++) { |
| 1780 | AVStream *st2 = s->streams[i]; |
| 1781 | AVIStream *ast2 = st2->priv_data; |
| 1782 | |
| 1783 | ast2->packet_size = |
| 1784 | ast2->remaining = 0; |
| 1785 | |
| 1786 | if (ast2->sub_ctx) { |
| 1787 | seek_subtitle(st, st2, timestamp); |
| 1788 | continue; |
| 1789 | } |
| 1790 | |
| 1791 | if (st2->nb_index_entries <= 0) |
| 1792 | continue; |
| 1793 | |
| 1794 | // av_assert1(st2->codec->block_align); |
| 1795 | av_assert0(fabs(av_q2d(st2->time_base) - ast2->scale / (double)ast2->rate) < av_q2d(st2->time_base) * 0.00000001); |
| 1796 | index = av_index_search_timestamp(st2, |
| 1797 | av_rescale_q(timestamp, |
| 1798 | st->time_base, |
| 1799 | st2->time_base) * |
| 1800 | FFMAX(ast2->sample_size, 1), |
| 1801 | flags | |
| 1802 | AVSEEK_FLAG_BACKWARD | |
| 1803 | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0)); |
| 1804 | if (index < 0) |
| 1805 | index = 0; |
| 1806 | ast2->seek_pos = st2->index_entries[index].pos; |
| 1807 | pos_min = FFMIN(pos_min,ast2->seek_pos); |
| 1808 | } |
| 1809 | for (i = 0; i < s->nb_streams; i++) { |
| 1810 | AVStream *st2 = s->streams[i]; |
| 1811 | AVIStream *ast2 = st2->priv_data; |
| 1812 | |
| 1813 | if (ast2->sub_ctx || st2->nb_index_entries <= 0) |
| 1814 | continue; |
| 1815 | |
| 1816 | index = av_index_search_timestamp( |
| 1817 | st2, |
| 1818 | av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1), |
| 1819 | flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0)); |
| 1820 | if (index < 0) |
| 1821 | index = 0; |
| 1822 | while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min) |
| 1823 | index--; |
| 1824 | ast2->frame_offset = st2->index_entries[index].timestamp; |
| 1825 | } |
| 1826 | |
| 1827 | /* do the seek */ |
| 1828 | if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) { |
| 1829 | av_log(s, AV_LOG_ERROR, "Seek failed\n"); |
| 1830 | return -1; |
| 1831 | } |
| 1832 | avi->stream_index = -1; |
| 1833 | avi->dts_max = INT_MIN; |
| 1834 | return 0; |
| 1835 | } |
| 1836 | |
| 1837 | static int avi_read_close(AVFormatContext *s) |
| 1838 | { |
| 1839 | int i; |
| 1840 | AVIContext *avi = s->priv_data; |
| 1841 | |
| 1842 | for (i = 0; i < s->nb_streams; i++) { |
| 1843 | AVStream *st = s->streams[i]; |
| 1844 | AVIStream *ast = st->priv_data; |
| 1845 | if (ast) { |
| 1846 | if (ast->sub_ctx) { |
| 1847 | av_freep(&ast->sub_ctx->pb); |
| 1848 | avformat_close_input(&ast->sub_ctx); |
| 1849 | } |
| 1850 | av_free(ast->sub_buffer); |
| 1851 | av_free_packet(&ast->sub_pkt); |
| 1852 | } |
| 1853 | } |
| 1854 | |
| 1855 | av_free(avi->dv_demux); |
| 1856 | |
| 1857 | return 0; |
| 1858 | } |
| 1859 | |
| 1860 | static int avi_probe(AVProbeData *p) |
| 1861 | { |
| 1862 | int i; |
| 1863 | |
| 1864 | /* check file header */ |
| 1865 | for (i = 0; avi_headers[i][0]; i++) |
| 1866 | if (!memcmp(p->buf, avi_headers[i], 4) && |
| 1867 | !memcmp(p->buf + 8, avi_headers[i] + 4, 4)) |
| 1868 | return AVPROBE_SCORE_MAX; |
| 1869 | |
| 1870 | return 0; |
| 1871 | } |
| 1872 | |
| 1873 | AVInputFormat ff_avi_demuxer = { |
| 1874 | .name = "avi", |
| 1875 | .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"), |
| 1876 | .priv_data_size = sizeof(AVIContext), |
| 1877 | .extensions = "avi", |
| 1878 | .read_probe = avi_probe, |
| 1879 | .read_header = avi_read_header, |
| 1880 | .read_packet = avi_read_packet, |
| 1881 | .read_close = avi_read_close, |
| 1882 | .read_seek = avi_read_seek, |
| 1883 | .priv_class = &demuxer_class, |
| 1884 | }; |