| OLD | NEW |
|---|
| (Empty) |
| 1 /* | |
| 2 * Copyright © 2010 Mozilla Foundation | |
| 3 * | |
| 4 * This program is made available under an ISC-style license. See the | |
| 5 * accompanying file LICENSE for details. | |
| 6 */ | |
| 7 #include <assert.h> | |
| 8 #include <stdlib.h> | |
| 9 #include <string.h> | |
| 10 | |
| 11 #include "third_party/nestegg/halloc/halloc.h" | |
| 12 #include "third_party/nestegg/include/nestegg/nestegg.h" | |
| 13 | |
| 14 /* EBML Elements */ | |
| 15 #define ID_EBML 0x1a45dfa3 | |
| 16 #define ID_EBML_VERSION 0x4286 | |
| 17 #define ID_EBML_READ_VERSION 0x42f7 | |
| 18 #define ID_EBML_MAX_ID_LENGTH 0x42f2 | |
| 19 #define ID_EBML_MAX_SIZE_LENGTH 0x42f3 | |
| 20 #define ID_DOCTYPE 0x4282 | |
| 21 #define ID_DOCTYPE_VERSION 0x4287 | |
| 22 #define ID_DOCTYPE_READ_VERSION 0x4285 | |
| 23 | |
| 24 /* Global Elements */ | |
| 25 #define ID_VOID 0xec | |
| 26 #define ID_CRC32 0xbf | |
| 27 | |
| 28 /* WebM Elements */ | |
| 29 #define ID_SEGMENT 0x18538067 | |
| 30 | |
| 31 /* Seek Head Elements */ | |
| 32 #define ID_SEEK_HEAD 0x114d9b74 | |
| 33 #define ID_SEEK 0x4dbb | |
| 34 #define ID_SEEK_ID 0x53ab | |
| 35 #define ID_SEEK_POSITION 0x53ac | |
| 36 | |
| 37 /* Info Elements */ | |
| 38 #define ID_INFO 0x1549a966 | |
| 39 #define ID_TIMECODE_SCALE 0x2ad7b1 | |
| 40 #define ID_DURATION 0x4489 | |
| 41 | |
| 42 /* Cluster Elements */ | |
| 43 #define ID_CLUSTER 0x1f43b675 | |
| 44 #define ID_TIMECODE 0xe7 | |
| 45 #define ID_BLOCK_GROUP 0xa0 | |
| 46 #define ID_SIMPLE_BLOCK 0xa3 | |
| 47 | |
| 48 /* BlockGroup Elements */ | |
| 49 #define ID_BLOCK 0xa1 | |
| 50 #define ID_BLOCK_DURATION 0x9b | |
| 51 #define ID_REFERENCE_BLOCK 0xfb | |
| 52 #define ID_DISCARD_PADDING 0x75a2 | |
| 53 | |
| 54 /* Tracks Elements */ | |
| 55 #define ID_TRACKS 0x1654ae6b | |
| 56 #define ID_TRACK_ENTRY 0xae | |
| 57 #define ID_TRACK_NUMBER 0xd7 | |
| 58 #define ID_TRACK_UID 0x73c5 | |
| 59 #define ID_TRACK_TYPE 0x83 | |
| 60 #define ID_FLAG_ENABLED 0xb9 | |
| 61 #define ID_FLAG_DEFAULT 0x88 | |
| 62 #define ID_FLAG_LACING 0x9c | |
| 63 #define ID_TRACK_TIMECODE_SCALE 0x23314f | |
| 64 #define ID_LANGUAGE 0x22b59c | |
| 65 #define ID_CODEC_ID 0x86 | |
| 66 #define ID_CODEC_PRIVATE 0x63a2 | |
| 67 #define ID_CODEC_DELAY 0x56aa | |
| 68 #define ID_SEEK_PREROLL 0x56bb | |
| 69 | |
| 70 /* Video Elements */ | |
| 71 #define ID_VIDEO 0xe0 | |
| 72 #define ID_STEREO_MODE 0x53b8 | |
| 73 #define ID_PIXEL_WIDTH 0xb0 | |
| 74 #define ID_PIXEL_HEIGHT 0xba | |
| 75 #define ID_PIXEL_CROP_BOTTOM 0x54aa | |
| 76 #define ID_PIXEL_CROP_TOP 0x54bb | |
| 77 #define ID_PIXEL_CROP_LEFT 0x54cc | |
| 78 #define ID_PIXEL_CROP_RIGHT 0x54dd | |
| 79 #define ID_DISPLAY_WIDTH 0x54b0 | |
| 80 #define ID_DISPLAY_HEIGHT 0x54ba | |
| 81 | |
| 82 /* Audio Elements */ | |
| 83 #define ID_AUDIO 0xe1 | |
| 84 #define ID_SAMPLING_FREQUENCY 0xb5 | |
| 85 #define ID_CHANNELS 0x9f | |
| 86 #define ID_BIT_DEPTH 0x6264 | |
| 87 | |
| 88 /* Cues Elements */ | |
| 89 #define ID_CUES 0x1c53bb6b | |
| 90 #define ID_CUE_POINT 0xbb | |
| 91 #define ID_CUE_TIME 0xb3 | |
| 92 #define ID_CUE_TRACK_POSITIONS 0xb7 | |
| 93 #define ID_CUE_TRACK 0xf7 | |
| 94 #define ID_CUE_CLUSTER_POSITION 0xf1 | |
| 95 #define ID_CUE_BLOCK_NUMBER 0x5378 | |
| 96 | |
| 97 /* EBML Types */ | |
| 98 enum ebml_type_enum { | |
| 99 TYPE_UNKNOWN, | |
| 100 TYPE_MASTER, | |
| 101 TYPE_UINT, | |
| 102 TYPE_FLOAT, | |
| 103 TYPE_INT, | |
| 104 TYPE_STRING, | |
| 105 TYPE_BINARY | |
| 106 }; | |
| 107 | |
| 108 #define LIMIT_STRING (1 << 20) | |
| 109 #define LIMIT_BINARY (1 << 24) | |
| 110 #define LIMIT_BLOCK (1 << 30) | |
| 111 #define LIMIT_FRAME (1 << 28) | |
| 112 | |
| 113 /* Field Flags */ | |
| 114 #define DESC_FLAG_NONE 0 | |
| 115 #define DESC_FLAG_MULTI (1 << 0) | |
| 116 #define DESC_FLAG_SUSPEND (1 << 1) | |
| 117 #define DESC_FLAG_OFFSET (1 << 2) | |
| 118 | |
| 119 /* Block Header Flags */ | |
| 120 #define BLOCK_FLAGS_LACING 6 | |
| 121 | |
| 122 /* Lacing Constants */ | |
| 123 #define LACING_NONE 0 | |
| 124 #define LACING_XIPH 1 | |
| 125 #define LACING_FIXED 2 | |
| 126 #define LACING_EBML 3 | |
| 127 | |
| 128 /* Track Types */ | |
| 129 #define TRACK_TYPE_VIDEO 1 | |
| 130 #define TRACK_TYPE_AUDIO 2 | |
| 131 | |
| 132 /* Track IDs */ | |
| 133 #define TRACK_ID_VP8 "V_VP8" | |
| 134 #define TRACK_ID_VP9 "V_VP9" | |
| 135 #define TRACK_ID_VORBIS "A_VORBIS" | |
| 136 #define TRACK_ID_OPUS "A_OPUS" | |
| 137 | |
| 138 enum vint_mask { | |
| 139 MASK_NONE, | |
| 140 MASK_FIRST_BIT | |
| 141 }; | |
| 142 | |
| 143 struct ebml_binary { | |
| 144 unsigned char * data; | |
| 145 size_t length; | |
| 146 }; | |
| 147 | |
| 148 struct ebml_list_node { | |
| 149 struct ebml_list_node * next; | |
| 150 uint64_t id; | |
| 151 void * data; | |
| 152 }; | |
| 153 | |
| 154 struct ebml_list { | |
| 155 struct ebml_list_node * head; | |
| 156 struct ebml_list_node * tail; | |
| 157 }; | |
| 158 | |
| 159 struct ebml_type { | |
| 160 union ebml_value { | |
| 161 uint64_t u; | |
| 162 double f; | |
| 163 int64_t i; | |
| 164 char * s; | |
| 165 struct ebml_binary b; | |
| 166 } v; | |
| 167 enum ebml_type_enum type; | |
| 168 int read; | |
| 169 }; | |
| 170 | |
| 171 /* EBML Definitions */ | |
| 172 struct ebml { | |
| 173 struct ebml_type ebml_version; | |
| 174 struct ebml_type ebml_read_version; | |
| 175 struct ebml_type ebml_max_id_length; | |
| 176 struct ebml_type ebml_max_size_length; | |
| 177 struct ebml_type doctype; | |
| 178 struct ebml_type doctype_version; | |
| 179 struct ebml_type doctype_read_version; | |
| 180 }; | |
| 181 | |
| 182 /* Matroksa Definitions */ | |
| 183 struct seek { | |
| 184 struct ebml_type id; | |
| 185 struct ebml_type position; | |
| 186 }; | |
| 187 | |
| 188 struct seek_head { | |
| 189 struct ebml_list seek; | |
| 190 }; | |
| 191 | |
| 192 struct info { | |
| 193 struct ebml_type timecode_scale; | |
| 194 struct ebml_type duration; | |
| 195 }; | |
| 196 | |
| 197 struct block_group { | |
| 198 struct ebml_type duration; | |
| 199 struct ebml_type reference_block; | |
| 200 struct ebml_type discard_padding; | |
| 201 }; | |
| 202 | |
| 203 struct cluster { | |
| 204 struct ebml_type timecode; | |
| 205 struct ebml_list block_group; | |
| 206 }; | |
| 207 | |
| 208 struct video { | |
| 209 struct ebml_type stereo_mode; | |
| 210 struct ebml_type pixel_width; | |
| 211 struct ebml_type pixel_height; | |
| 212 struct ebml_type pixel_crop_bottom; | |
| 213 struct ebml_type pixel_crop_top; | |
| 214 struct ebml_type pixel_crop_left; | |
| 215 struct ebml_type pixel_crop_right; | |
| 216 struct ebml_type display_width; | |
| 217 struct ebml_type display_height; | |
| 218 }; | |
| 219 | |
| 220 struct audio { | |
| 221 struct ebml_type sampling_frequency; | |
| 222 struct ebml_type channels; | |
| 223 struct ebml_type bit_depth; | |
| 224 }; | |
| 225 | |
| 226 struct track_entry { | |
| 227 struct ebml_type number; | |
| 228 struct ebml_type uid; | |
| 229 struct ebml_type type; | |
| 230 struct ebml_type flag_enabled; | |
| 231 struct ebml_type flag_default; | |
| 232 struct ebml_type flag_lacing; | |
| 233 struct ebml_type track_timecode_scale; | |
| 234 struct ebml_type language; | |
| 235 struct ebml_type codec_id; | |
| 236 struct ebml_type codec_private; | |
| 237 struct ebml_type codec_delay; | |
| 238 struct ebml_type seek_preroll; | |
| 239 struct video video; | |
| 240 struct audio audio; | |
| 241 }; | |
| 242 | |
| 243 struct tracks { | |
| 244 struct ebml_list track_entry; | |
| 245 }; | |
| 246 | |
| 247 struct cue_track_positions { | |
| 248 struct ebml_type track; | |
| 249 struct ebml_type cluster_position; | |
| 250 struct ebml_type block_number; | |
| 251 }; | |
| 252 | |
| 253 struct cue_point { | |
| 254 struct ebml_type time; | |
| 255 struct ebml_list cue_track_positions; | |
| 256 }; | |
| 257 | |
| 258 struct cues { | |
| 259 struct ebml_list cue_point; | |
| 260 }; | |
| 261 | |
| 262 struct segment { | |
| 263 struct ebml_list seek_head; | |
| 264 struct info info; | |
| 265 struct ebml_list cluster; | |
| 266 struct tracks tracks; | |
| 267 struct cues cues; | |
| 268 }; | |
| 269 | |
| 270 /* Misc. */ | |
| 271 struct pool_ctx { | |
| 272 char dummy; | |
| 273 }; | |
| 274 | |
| 275 struct list_node { | |
| 276 struct list_node * previous; | |
| 277 struct ebml_element_desc * node; | |
| 278 unsigned char * data; | |
| 279 }; | |
| 280 | |
| 281 struct saved_state { | |
| 282 int64_t stream_offset; | |
| 283 struct list_node * ancestor; | |
| 284 uint64_t last_id; | |
| 285 uint64_t last_size; | |
| 286 int last_valid; | |
| 287 }; | |
| 288 | |
| 289 struct frame { | |
| 290 unsigned char * data; | |
| 291 size_t length; | |
| 292 struct frame * next; | |
| 293 }; | |
| 294 | |
| 295 /* Public (opaque) Structures */ | |
| 296 struct nestegg { | |
| 297 nestegg_io * io; | |
| 298 nestegg_log log; | |
| 299 struct pool_ctx * alloc_pool; | |
| 300 uint64_t last_id; | |
| 301 uint64_t last_size; | |
| 302 int last_valid; | |
| 303 struct list_node * ancestor; | |
| 304 struct ebml ebml; | |
| 305 struct segment segment; | |
| 306 int64_t segment_offset; | |
| 307 unsigned int track_count; | |
| 308 }; | |
| 309 | |
| 310 struct nestegg_packet { | |
| 311 uint64_t track; | |
| 312 uint64_t timecode; | |
| 313 struct frame * frame; | |
| 314 int64_t discard_padding; | |
| 315 }; | |
| 316 | |
| 317 /* Element Descriptor */ | |
| 318 struct ebml_element_desc { | |
| 319 char const * name; | |
| 320 uint64_t id; | |
| 321 enum ebml_type_enum type; | |
| 322 size_t offset; | |
| 323 unsigned int flags; | |
| 324 struct ebml_element_desc * children; | |
| 325 size_t size; | |
| 326 size_t data_offset; | |
| 327 }; | |
| 328 | |
| 329 #define E_FIELD(ID, TYPE, STRUCT, FIELD) \ | |
| 330 { #ID, ID, TYPE, offsetof(STRUCT, FIELD), DESC_FLAG_NONE, NULL, 0, 0 } | |
| 331 #define E_MASTER(ID, TYPE, STRUCT, FIELD) \ | |
| 332 { #ID, ID, TYPE, offsetof(STRUCT, FIELD), DESC_FLAG_MULTI, ne_ ## FIELD ## _el
ements, \ | |
| 333 sizeof(struct FIELD), 0 } | |
| 334 #define E_SINGLE_MASTER_O(ID, TYPE, STRUCT, FIELD) \ | |
| 335 { #ID, ID, TYPE, offsetof(STRUCT, FIELD), DESC_FLAG_OFFSET, ne_ ## FIELD ## _e
lements, 0, \ | |
| 336 offsetof(STRUCT, FIELD ## _offset) } | |
| 337 #define E_SINGLE_MASTER(ID, TYPE, STRUCT, FIELD) \ | |
| 338 { #ID, ID, TYPE, offsetof(STRUCT, FIELD), DESC_FLAG_NONE, ne_ ## FIELD ## _ele
ments, 0, 0 } | |
| 339 #define E_SUSPEND(ID, TYPE) \ | |
| 340 { #ID, ID, TYPE, 0, DESC_FLAG_SUSPEND, NULL, 0, 0 } | |
| 341 #define E_LAST \ | |
| 342 { NULL, 0, 0, 0, DESC_FLAG_NONE, NULL, 0, 0 } | |
| 343 | |
| 344 /* EBML Element Lists */ | |
| 345 static struct ebml_element_desc ne_ebml_elements[] = { | |
| 346 E_FIELD(ID_EBML_VERSION, TYPE_UINT, struct ebml, ebml_version), | |
| 347 E_FIELD(ID_EBML_READ_VERSION, TYPE_UINT, struct ebml, ebml_read_version), | |
| 348 E_FIELD(ID_EBML_MAX_ID_LENGTH, TYPE_UINT, struct ebml, ebml_max_id_length), | |
| 349 E_FIELD(ID_EBML_MAX_SIZE_LENGTH, TYPE_UINT, struct ebml, ebml_max_size_length)
, | |
| 350 E_FIELD(ID_DOCTYPE, TYPE_STRING, struct ebml, doctype), | |
| 351 E_FIELD(ID_DOCTYPE_VERSION, TYPE_UINT, struct ebml, doctype_version), | |
| 352 E_FIELD(ID_DOCTYPE_READ_VERSION, TYPE_UINT, struct ebml, doctype_read_version)
, | |
| 353 E_LAST | |
| 354 }; | |
| 355 | |
| 356 /* WebM Element Lists */ | |
| 357 static struct ebml_element_desc ne_seek_elements[] = { | |
| 358 E_FIELD(ID_SEEK_ID, TYPE_BINARY, struct seek, id), | |
| 359 E_FIELD(ID_SEEK_POSITION, TYPE_UINT, struct seek, position), | |
| 360 E_LAST | |
| 361 }; | |
| 362 | |
| 363 static struct ebml_element_desc ne_seek_head_elements[] = { | |
| 364 E_MASTER(ID_SEEK, TYPE_MASTER, struct seek_head, seek), | |
| 365 E_LAST | |
| 366 }; | |
| 367 | |
| 368 static struct ebml_element_desc ne_info_elements[] = { | |
| 369 E_FIELD(ID_TIMECODE_SCALE, TYPE_UINT, struct info, timecode_scale), | |
| 370 E_FIELD(ID_DURATION, TYPE_FLOAT, struct info, duration), | |
| 371 E_LAST | |
| 372 }; | |
| 373 | |
| 374 static struct ebml_element_desc ne_block_group_elements[] = { | |
| 375 E_SUSPEND(ID_BLOCK, TYPE_BINARY), | |
| 376 E_FIELD(ID_BLOCK_DURATION, TYPE_UINT, struct block_group, duration), | |
| 377 E_FIELD(ID_REFERENCE_BLOCK, TYPE_INT, struct block_group, reference_block), | |
| 378 E_FIELD(ID_DISCARD_PADDING, TYPE_INT, struct block_group, discard_padding), | |
| 379 E_LAST | |
| 380 }; | |
| 381 | |
| 382 static struct ebml_element_desc ne_cluster_elements[] = { | |
| 383 E_FIELD(ID_TIMECODE, TYPE_UINT, struct cluster, timecode), | |
| 384 E_MASTER(ID_BLOCK_GROUP, TYPE_MASTER, struct cluster, block_group), | |
| 385 E_SUSPEND(ID_SIMPLE_BLOCK, TYPE_BINARY), | |
| 386 E_LAST | |
| 387 }; | |
| 388 | |
| 389 static struct ebml_element_desc ne_video_elements[] = { | |
| 390 E_FIELD(ID_STEREO_MODE, TYPE_UINT, struct video, stereo_mode), | |
| 391 E_FIELD(ID_PIXEL_WIDTH, TYPE_UINT, struct video, pixel_width), | |
| 392 E_FIELD(ID_PIXEL_HEIGHT, TYPE_UINT, struct video, pixel_height), | |
| 393 E_FIELD(ID_PIXEL_CROP_BOTTOM, TYPE_UINT, struct video, pixel_crop_bottom), | |
| 394 E_FIELD(ID_PIXEL_CROP_TOP, TYPE_UINT, struct video, pixel_crop_top), | |
| 395 E_FIELD(ID_PIXEL_CROP_LEFT, TYPE_UINT, struct video, pixel_crop_left), | |
| 396 E_FIELD(ID_PIXEL_CROP_RIGHT, TYPE_UINT, struct video, pixel_crop_right), | |
| 397 E_FIELD(ID_DISPLAY_WIDTH, TYPE_UINT, struct video, display_width), | |
| 398 E_FIELD(ID_DISPLAY_HEIGHT, TYPE_UINT, struct video, display_height), | |
| 399 E_LAST | |
| 400 }; | |
| 401 | |
| 402 static struct ebml_element_desc ne_audio_elements[] = { | |
| 403 E_FIELD(ID_SAMPLING_FREQUENCY, TYPE_FLOAT, struct audio, sampling_frequency), | |
| 404 E_FIELD(ID_CHANNELS, TYPE_UINT, struct audio, channels), | |
| 405 E_FIELD(ID_BIT_DEPTH, TYPE_UINT, struct audio, bit_depth), | |
| 406 E_LAST | |
| 407 }; | |
| 408 | |
| 409 static struct ebml_element_desc ne_track_entry_elements[] = { | |
| 410 E_FIELD(ID_TRACK_NUMBER, TYPE_UINT, struct track_entry, number), | |
| 411 E_FIELD(ID_TRACK_UID, TYPE_UINT, struct track_entry, uid), | |
| 412 E_FIELD(ID_TRACK_TYPE, TYPE_UINT, struct track_entry, type), | |
| 413 E_FIELD(ID_FLAG_ENABLED, TYPE_UINT, struct track_entry, flag_enabled), | |
| 414 E_FIELD(ID_FLAG_DEFAULT, TYPE_UINT, struct track_entry, flag_default), | |
| 415 E_FIELD(ID_FLAG_LACING, TYPE_UINT, struct track_entry, flag_lacing), | |
| 416 E_FIELD(ID_TRACK_TIMECODE_SCALE, TYPE_FLOAT, struct track_entry, track_timecod
e_scale), | |
| 417 E_FIELD(ID_LANGUAGE, TYPE_STRING, struct track_entry, language), | |
| 418 E_FIELD(ID_CODEC_ID, TYPE_STRING, struct track_entry, codec_id), | |
| 419 E_FIELD(ID_CODEC_PRIVATE, TYPE_BINARY, struct track_entry, codec_private), | |
| 420 E_FIELD(ID_CODEC_DELAY, TYPE_UINT, struct track_entry, codec_delay), | |
| 421 E_FIELD(ID_SEEK_PREROLL, TYPE_UINT, struct track_entry, seek_preroll), | |
| 422 E_SINGLE_MASTER(ID_VIDEO, TYPE_MASTER, struct track_entry, video), | |
| 423 E_SINGLE_MASTER(ID_AUDIO, TYPE_MASTER, struct track_entry, audio), | |
| 424 E_LAST | |
| 425 }; | |
| 426 | |
| 427 static struct ebml_element_desc ne_tracks_elements[] = { | |
| 428 E_MASTER(ID_TRACK_ENTRY, TYPE_MASTER, struct tracks, track_entry), | |
| 429 E_LAST | |
| 430 }; | |
| 431 | |
| 432 static struct ebml_element_desc ne_cue_track_positions_elements[] = { | |
| 433 E_FIELD(ID_CUE_TRACK, TYPE_UINT, struct cue_track_positions, track), | |
| 434 E_FIELD(ID_CUE_CLUSTER_POSITION, TYPE_UINT, struct cue_track_positions, cluste
r_position), | |
| 435 E_FIELD(ID_CUE_BLOCK_NUMBER, TYPE_UINT, struct cue_track_positions, block_numb
er), | |
| 436 E_LAST | |
| 437 }; | |
| 438 | |
| 439 static struct ebml_element_desc ne_cue_point_elements[] = { | |
| 440 E_FIELD(ID_CUE_TIME, TYPE_UINT, struct cue_point, time), | |
| 441 E_MASTER(ID_CUE_TRACK_POSITIONS, TYPE_MASTER, struct cue_point, cue_track_posi
tions), | |
| 442 E_LAST | |
| 443 }; | |
| 444 | |
| 445 static struct ebml_element_desc ne_cues_elements[] = { | |
| 446 E_MASTER(ID_CUE_POINT, TYPE_MASTER, struct cues, cue_point), | |
| 447 E_LAST | |
| 448 }; | |
| 449 | |
| 450 static struct ebml_element_desc ne_segment_elements[] = { | |
| 451 E_MASTER(ID_SEEK_HEAD, TYPE_MASTER, struct segment, seek_head), | |
| 452 E_SINGLE_MASTER(ID_INFO, TYPE_MASTER, struct segment, info), | |
| 453 E_MASTER(ID_CLUSTER, TYPE_MASTER, struct segment, cluster), | |
| 454 E_SINGLE_MASTER(ID_TRACKS, TYPE_MASTER, struct segment, tracks), | |
| 455 E_SINGLE_MASTER(ID_CUES, TYPE_MASTER, struct segment, cues), | |
| 456 E_LAST | |
| 457 }; | |
| 458 | |
| 459 static struct ebml_element_desc ne_top_level_elements[] = { | |
| 460 E_SINGLE_MASTER(ID_EBML, TYPE_MASTER, nestegg, ebml), | |
| 461 E_SINGLE_MASTER_O(ID_SEGMENT, TYPE_MASTER, nestegg, segment), | |
| 462 E_LAST | |
| 463 }; | |
| 464 | |
| 465 #undef E_FIELD | |
| 466 #undef E_MASTER | |
| 467 #undef E_SINGLE_MASTER_O | |
| 468 #undef E_SINGLE_MASTER | |
| 469 #undef E_SUSPEND | |
| 470 #undef E_LAST | |
| 471 | |
| 472 static struct pool_ctx * | |
| 473 ne_pool_init(void) | |
| 474 { | |
| 475 struct pool_ctx * pool; | |
| 476 | |
| 477 pool = h_malloc(sizeof(*pool)); | |
| 478 if (!pool) | |
| 479 abort(); | |
| 480 return pool; | |
| 481 } | |
| 482 | |
| 483 static void | |
| 484 ne_pool_destroy(struct pool_ctx * pool) | |
| 485 { | |
| 486 h_free(pool); | |
| 487 } | |
| 488 | |
| 489 static void * | |
| 490 ne_pool_alloc(size_t size, struct pool_ctx * pool) | |
| 491 { | |
| 492 void * p; | |
| 493 | |
| 494 p = h_malloc(size); | |
| 495 if (!p) | |
| 496 abort(); | |
| 497 hattach(p, pool); | |
| 498 memset(p, 0, size); | |
| 499 return p; | |
| 500 } | |
| 501 | |
| 502 static void * | |
| 503 ne_alloc(size_t size) | |
| 504 { | |
| 505 void * p; | |
| 506 | |
| 507 p = calloc(1, size); | |
| 508 if (!p) | |
| 509 abort(); | |
| 510 return p; | |
| 511 } | |
| 512 | |
| 513 static int | |
| 514 ne_io_read(nestegg_io * io, void * buffer, size_t length) | |
| 515 { | |
| 516 return io->read(buffer, length, io->userdata); | |
| 517 } | |
| 518 | |
| 519 static int | |
| 520 ne_io_seek(nestegg_io * io, int64_t offset, int whence) | |
| 521 { | |
| 522 return io->seek(offset, whence, io->userdata); | |
| 523 } | |
| 524 | |
| 525 static int | |
| 526 ne_io_read_skip(nestegg_io * io, size_t length) | |
| 527 { | |
| 528 size_t get; | |
| 529 unsigned char buf[8192]; | |
| 530 int r = 1; | |
| 531 | |
| 532 while (length > 0) { | |
| 533 get = length < sizeof(buf) ? length : sizeof(buf); | |
| 534 r = ne_io_read(io, buf, get); | |
| 535 if (r != 1) | |
| 536 break; | |
| 537 length -= get; | |
| 538 } | |
| 539 | |
| 540 return r; | |
| 541 } | |
| 542 | |
| 543 static int64_t | |
| 544 ne_io_tell(nestegg_io * io) | |
| 545 { | |
| 546 return io->tell(io->userdata); | |
| 547 } | |
| 548 | |
| 549 static int | |
| 550 ne_bare_read_vint(nestegg_io * io, uint64_t * value, uint64_t * length, enum vin
t_mask maskflag) | |
| 551 { | |
| 552 int r; | |
| 553 unsigned char b; | |
| 554 size_t maxlen = 8; | |
| 555 unsigned int count = 1, mask = 1 << 7; | |
| 556 | |
| 557 r = ne_io_read(io, &b, 1); | |
| 558 if (r != 1) | |
| 559 return r; | |
| 560 | |
| 561 while (count < maxlen) { | |
| 562 if ((b & mask) != 0) | |
| 563 break; | |
| 564 mask >>= 1; | |
| 565 count += 1; | |
| 566 } | |
| 567 | |
| 568 if (length) | |
| 569 *length = count; | |
| 570 *value = b; | |
| 571 | |
| 572 if (maskflag == MASK_FIRST_BIT) | |
| 573 *value = b & ~mask; | |
| 574 | |
| 575 while (--count) { | |
| 576 r = ne_io_read(io, &b, 1); | |
| 577 if (r != 1) | |
| 578 return r; | |
| 579 *value <<= 8; | |
| 580 *value |= b; | |
| 581 } | |
| 582 | |
| 583 return 1; | |
| 584 } | |
| 585 | |
| 586 static int | |
| 587 ne_read_id(nestegg_io * io, uint64_t * value, uint64_t * length) | |
| 588 { | |
| 589 return ne_bare_read_vint(io, value, length, MASK_NONE); | |
| 590 } | |
| 591 | |
| 592 static int | |
| 593 ne_read_vint(nestegg_io * io, uint64_t * value, uint64_t * length) | |
| 594 { | |
| 595 return ne_bare_read_vint(io, value, length, MASK_FIRST_BIT); | |
| 596 } | |
| 597 | |
| 598 static int | |
| 599 ne_read_svint(nestegg_io * io, int64_t * value, uint64_t * length) | |
| 600 { | |
| 601 int r; | |
| 602 uint64_t uvalue; | |
| 603 uint64_t ulength; | |
| 604 int64_t svint_subtr[] = { | |
| 605 0x3f, 0x1fff, | |
| 606 0xfffff, 0x7ffffff, | |
| 607 0x3ffffffffLL, 0x1ffffffffffLL, | |
| 608 0xffffffffffffLL, 0x7fffffffffffffLL | |
| 609 }; | |
| 610 | |
| 611 r = ne_bare_read_vint(io, &uvalue, &ulength, MASK_FIRST_BIT); | |
| 612 if (r != 1) | |
| 613 return r; | |
| 614 *value = uvalue - svint_subtr[ulength - 1]; | |
| 615 if (length) | |
| 616 *length = ulength; | |
| 617 return r; | |
| 618 } | |
| 619 | |
| 620 static int | |
| 621 ne_read_uint(nestegg_io * io, uint64_t * val, uint64_t length) | |
| 622 { | |
| 623 unsigned char b; | |
| 624 int r; | |
| 625 | |
| 626 if (length == 0 || length > 8) | |
| 627 return -1; | |
| 628 r = ne_io_read(io, &b, 1); | |
| 629 if (r != 1) | |
| 630 return r; | |
| 631 *val = b; | |
| 632 while (--length) { | |
| 633 r = ne_io_read(io, &b, 1); | |
| 634 if (r != 1) | |
| 635 return r; | |
| 636 *val <<= 8; | |
| 637 *val |= b; | |
| 638 } | |
| 639 return 1; | |
| 640 } | |
| 641 | |
| 642 static int | |
| 643 ne_read_int(nestegg_io * io, int64_t * val, uint64_t length) | |
| 644 { | |
| 645 int r; | |
| 646 uint64_t uval, base; | |
| 647 | |
| 648 r = ne_read_uint(io, &uval, length); | |
| 649 if (r != 1) | |
| 650 return r; | |
| 651 | |
| 652 if (length < sizeof(int64_t)) { | |
| 653 base = 1; | |
| 654 base <<= length * 8 - 1; | |
| 655 if (uval >= base) { | |
| 656 base = 1; | |
| 657 base <<= length * 8; | |
| 658 } else { | |
| 659 base = 0; | |
| 660 } | |
| 661 *val = uval - base; | |
| 662 } else { | |
| 663 *val = (int64_t) uval; | |
| 664 } | |
| 665 | |
| 666 return 1; | |
| 667 } | |
| 668 | |
| 669 static int | |
| 670 ne_read_float(nestegg_io * io, double * val, uint64_t length) | |
| 671 { | |
| 672 union { | |
| 673 uint64_t u; | |
| 674 float f; | |
| 675 double d; | |
| 676 } value; | |
| 677 int r; | |
| 678 | |
| 679 /* Length == 10 not implemented. */ | |
| 680 if (length != 4 && length != 8) | |
| 681 return -1; | |
| 682 r = ne_read_uint(io, &value.u, length); | |
| 683 if (r != 1) | |
| 684 return r; | |
| 685 if (length == 4) | |
| 686 *val = value.f; | |
| 687 else | |
| 688 *val = value.d; | |
| 689 return 1; | |
| 690 } | |
| 691 | |
| 692 static int | |
| 693 ne_read_string(nestegg * ctx, char ** val, uint64_t length) | |
| 694 { | |
| 695 char * str; | |
| 696 int r; | |
| 697 const size_t alloc_size = (size_t)length + 1; | |
| 698 | |
| 699 if (length == 0 || length > LIMIT_STRING) | |
| 700 return -1; | |
| 701 str = ne_pool_alloc(alloc_size, ctx->alloc_pool); | |
| 702 r = ne_io_read(ctx->io, (unsigned char *) str, alloc_size - 1); | |
| 703 if (r != 1) | |
| 704 return r; | |
| 705 str[alloc_size - 1] = '\0'; | |
| 706 *val = str; | |
| 707 return 1; | |
| 708 } | |
| 709 | |
| 710 static int | |
| 711 ne_read_binary(nestegg * ctx, struct ebml_binary * val, uint64_t length) | |
| 712 { | |
| 713 if (length == 0 || length > LIMIT_BINARY) | |
| 714 return -1; | |
| 715 val->length = (size_t)length; | |
| 716 val->data = ne_pool_alloc(val->length, ctx->alloc_pool); | |
| 717 return ne_io_read(ctx->io, val->data, val->length); | |
| 718 } | |
| 719 | |
| 720 static int | |
| 721 ne_get_uint(struct ebml_type type, uint64_t * value) | |
| 722 { | |
| 723 if (!type.read) | |
| 724 return -1; | |
| 725 | |
| 726 assert(type.type == TYPE_UINT); | |
| 727 | |
| 728 *value = type.v.u; | |
| 729 | |
| 730 return 0; | |
| 731 } | |
| 732 | |
| 733 static int | |
| 734 ne_get_uint32(struct ebml_type type, unsigned int * value) | |
| 735 { | |
| 736 uint64_t v; | |
| 737 if (ne_get_uint(type, &v)) | |
| 738 return -1; | |
| 739 | |
| 740 assert((unsigned int)v == v); | |
| 741 | |
| 742 *value = (unsigned int)v; | |
| 743 | |
| 744 return 0; | |
| 745 } | |
| 746 | |
| 747 static int | |
| 748 ne_get_float(struct ebml_type type, double * value) | |
| 749 { | |
| 750 if (!type.read) | |
| 751 return -1; | |
| 752 | |
| 753 assert(type.type == TYPE_FLOAT); | |
| 754 | |
| 755 *value = type.v.f; | |
| 756 | |
| 757 return 0; | |
| 758 } | |
| 759 | |
| 760 static int | |
| 761 ne_get_string(struct ebml_type type, char ** value) | |
| 762 { | |
| 763 if (!type.read) | |
| 764 return -1; | |
| 765 | |
| 766 assert(type.type == TYPE_STRING); | |
| 767 | |
| 768 *value = type.v.s; | |
| 769 | |
| 770 return 0; | |
| 771 } | |
| 772 | |
| 773 static int | |
| 774 ne_get_binary(struct ebml_type type, struct ebml_binary * value) | |
| 775 { | |
| 776 if (!type.read) | |
| 777 return -1; | |
| 778 | |
| 779 assert(type.type == TYPE_BINARY); | |
| 780 | |
| 781 *value = type.v.b; | |
| 782 | |
| 783 return 0; | |
| 784 } | |
| 785 | |
| 786 static int | |
| 787 ne_is_ancestor_element(uint64_t id, struct list_node * ancestor) | |
| 788 { | |
| 789 struct ebml_element_desc * element; | |
| 790 | |
| 791 for (; ancestor; ancestor = ancestor->previous) | |
| 792 for (element = ancestor->node; element->id; ++element) | |
| 793 if (element->id == id) | |
| 794 return 1; | |
| 795 | |
| 796 return 0; | |
| 797 } | |
| 798 | |
| 799 static struct ebml_element_desc * | |
| 800 ne_find_element(uint64_t id, struct ebml_element_desc * elements) | |
| 801 { | |
| 802 struct ebml_element_desc * element; | |
| 803 | |
| 804 for (element = elements; element->id; ++element) | |
| 805 if (element->id == id) | |
| 806 return element; | |
| 807 | |
| 808 return NULL; | |
| 809 } | |
| 810 | |
| 811 static void | |
| 812 ne_ctx_push(nestegg * ctx, struct ebml_element_desc * ancestor, void * data) | |
| 813 { | |
| 814 struct list_node * item; | |
| 815 | |
| 816 item = ne_alloc(sizeof(*item)); | |
| 817 item->previous = ctx->ancestor; | |
| 818 item->node = ancestor; | |
| 819 item->data = data; | |
| 820 ctx->ancestor = item; | |
| 821 } | |
| 822 | |
| 823 static void | |
| 824 ne_ctx_pop(nestegg * ctx) | |
| 825 { | |
| 826 struct list_node * item; | |
| 827 | |
| 828 item = ctx->ancestor; | |
| 829 ctx->ancestor = item->previous; | |
| 830 free(item); | |
| 831 } | |
| 832 | |
| 833 static int | |
| 834 ne_ctx_save(nestegg * ctx, struct saved_state * s) | |
| 835 { | |
| 836 s->stream_offset = ne_io_tell(ctx->io); | |
| 837 if (s->stream_offset < 0) | |
| 838 return -1; | |
| 839 s->ancestor = ctx->ancestor; | |
| 840 s->last_id = ctx->last_id; | |
| 841 s->last_size = ctx->last_size; | |
| 842 s->last_valid = ctx->last_valid; | |
| 843 return 0; | |
| 844 } | |
| 845 | |
| 846 static int | |
| 847 ne_ctx_restore(nestegg * ctx, struct saved_state * s) | |
| 848 { | |
| 849 int r; | |
| 850 | |
| 851 r = ne_io_seek(ctx->io, s->stream_offset, NESTEGG_SEEK_SET); | |
| 852 if (r != 0) | |
| 853 return -1; | |
| 854 ctx->ancestor = s->ancestor; | |
| 855 ctx->last_id = s->last_id; | |
| 856 ctx->last_size = s->last_size; | |
| 857 ctx->last_valid = s->last_valid; | |
| 858 return 0; | |
| 859 } | |
| 860 | |
| 861 static int | |
| 862 ne_peek_element(nestegg * ctx, uint64_t * id, uint64_t * size) | |
| 863 { | |
| 864 int r; | |
| 865 | |
| 866 if (ctx->last_valid) { | |
| 867 if (id) | |
| 868 *id = ctx->last_id; | |
| 869 if (size) | |
| 870 *size = ctx->last_size; | |
| 871 return 1; | |
| 872 } | |
| 873 | |
| 874 r = ne_read_id(ctx->io, &ctx->last_id, NULL); | |
| 875 if (r != 1) | |
| 876 return r; | |
| 877 | |
| 878 r = ne_read_vint(ctx->io, &ctx->last_size, NULL); | |
| 879 if (r != 1) | |
| 880 return r; | |
| 881 | |
| 882 if (id) | |
| 883 *id = ctx->last_id; | |
| 884 if (size) | |
| 885 *size = ctx->last_size; | |
| 886 | |
| 887 ctx->last_valid = 1; | |
| 888 | |
| 889 return 1; | |
| 890 } | |
| 891 | |
| 892 static int | |
| 893 ne_read_element(nestegg * ctx, uint64_t * id, uint64_t * size) | |
| 894 { | |
| 895 int r; | |
| 896 | |
| 897 r = ne_peek_element(ctx, id, size); | |
| 898 if (r != 1) | |
| 899 return r; | |
| 900 | |
| 901 ctx->last_valid = 0; | |
| 902 | |
| 903 return 1; | |
| 904 } | |
| 905 | |
| 906 static void | |
| 907 ne_read_master(nestegg * ctx, struct ebml_element_desc * desc) | |
| 908 { | |
| 909 struct ebml_list * list; | |
| 910 struct ebml_list_node * node, * oldtail; | |
| 911 | |
| 912 assert(desc->type == TYPE_MASTER && desc->flags & DESC_FLAG_MULTI); | |
| 913 | |
| 914 ctx->log(ctx, NESTEGG_LOG_DEBUG, "multi master element %llx (%s)", | |
| 915 desc->id, desc->name); | |
| 916 | |
| 917 list = (struct ebml_list *) (ctx->ancestor->data + desc->offset); | |
| 918 | |
| 919 node = ne_pool_alloc(sizeof(*node), ctx->alloc_pool); | |
| 920 node->id = desc->id; | |
| 921 node->data = ne_pool_alloc(desc->size, ctx->alloc_pool); | |
| 922 | |
| 923 oldtail = list->tail; | |
| 924 if (oldtail) | |
| 925 oldtail->next = node; | |
| 926 list->tail = node; | |
| 927 if (!list->head) | |
| 928 list->head = node; | |
| 929 | |
| 930 ctx->log(ctx, NESTEGG_LOG_DEBUG, " -> using data %p", node->data); | |
| 931 | |
| 932 ne_ctx_push(ctx, desc->children, node->data); | |
| 933 } | |
| 934 | |
| 935 static void | |
| 936 ne_read_single_master(nestegg * ctx, struct ebml_element_desc * desc) | |
| 937 { | |
| 938 assert(desc->type == TYPE_MASTER && !(desc->flags & DESC_FLAG_MULTI)); | |
| 939 | |
| 940 ctx->log(ctx, NESTEGG_LOG_DEBUG, "single master element %llx (%s)", | |
| 941 desc->id, desc->name); | |
| 942 ctx->log(ctx, NESTEGG_LOG_DEBUG, " -> using data %p (%u)", | |
| 943 ctx->ancestor->data + desc->offset, desc->offset); | |
| 944 | |
| 945 ne_ctx_push(ctx, desc->children, ctx->ancestor->data + desc->offset); | |
| 946 } | |
| 947 | |
| 948 static int | |
| 949 ne_read_simple(nestegg * ctx, struct ebml_element_desc * desc, size_t length) | |
| 950 { | |
| 951 struct ebml_type * storage; | |
| 952 int r = 0; | |
| 953 | |
| 954 storage = (struct ebml_type *) (ctx->ancestor->data + desc->offset); | |
| 955 | |
| 956 if (storage->read) { | |
| 957 ctx->log(ctx, NESTEGG_LOG_DEBUG, "element %llx (%s) already read, skipping", | |
| 958 desc->id, desc->name); | |
| 959 return 0; | |
| 960 } | |
| 961 | |
| 962 storage->type = desc->type; | |
| 963 | |
| 964 ctx->log(ctx, NESTEGG_LOG_DEBUG, "element %llx (%s) -> %p (%u)", | |
| 965 desc->id, desc->name, storage, desc->offset); | |
| 966 | |
| 967 switch (desc->type) { | |
| 968 case TYPE_UINT: | |
| 969 r = ne_read_uint(ctx->io, &storage->v.u, length); | |
| 970 break; | |
| 971 case TYPE_FLOAT: | |
| 972 r = ne_read_float(ctx->io, &storage->v.f, length); | |
| 973 break; | |
| 974 case TYPE_INT: | |
| 975 r = ne_read_int(ctx->io, &storage->v.i, length); | |
| 976 break; | |
| 977 case TYPE_STRING: | |
| 978 r = ne_read_string(ctx, &storage->v.s, length); | |
| 979 break; | |
| 980 case TYPE_BINARY: | |
| 981 r = ne_read_binary(ctx, &storage->v.b, length); | |
| 982 break; | |
| 983 case TYPE_MASTER: | |
| 984 case TYPE_UNKNOWN: | |
| 985 assert(0); | |
| 986 break; | |
| 987 } | |
| 988 | |
| 989 if (r == 1) | |
| 990 storage->read = 1; | |
| 991 | |
| 992 return r; | |
| 993 } | |
| 994 | |
| 995 static int | |
| 996 ne_parse(nestegg * ctx, struct ebml_element_desc * top_level, int64_t max_offset
) | |
| 997 { | |
| 998 int r; | |
| 999 int64_t * data_offset; | |
| 1000 uint64_t id, size, peeked_id; | |
| 1001 struct ebml_element_desc * element; | |
| 1002 | |
| 1003 if (!ctx->ancestor) | |
| 1004 return -1; | |
| 1005 | |
| 1006 for (;;) { | |
| 1007 if (max_offset > 0 && ne_io_tell(ctx->io) >= max_offset) { | |
| 1008 /* Reached end of offset allowed for parsing - return gracefully */ | |
| 1009 r = 1; | |
| 1010 break; | |
| 1011 } | |
| 1012 r = ne_peek_element(ctx, &id, &size); | |
| 1013 if (r != 1) | |
| 1014 break; | |
| 1015 peeked_id = id; | |
| 1016 | |
| 1017 element = ne_find_element(id, ctx->ancestor->node); | |
| 1018 if (element) { | |
| 1019 if (element->flags & DESC_FLAG_SUSPEND) { | |
| 1020 assert(element->type == TYPE_BINARY); | |
| 1021 ctx->log(ctx, NESTEGG_LOG_DEBUG, "suspend parse at %llx", id); | |
| 1022 r = 1; | |
| 1023 break; | |
| 1024 } | |
| 1025 | |
| 1026 r = ne_read_element(ctx, &id, &size); | |
| 1027 if (r != 1) | |
| 1028 break; | |
| 1029 assert(id == peeked_id); | |
| 1030 | |
| 1031 if (element->flags & DESC_FLAG_OFFSET) { | |
| 1032 data_offset = (int64_t *) (ctx->ancestor->data + element->data_offset); | |
| 1033 *data_offset = ne_io_tell(ctx->io); | |
| 1034 if (*data_offset < 0) { | |
| 1035 r = -1; | |
| 1036 break; | |
| 1037 } | |
| 1038 } | |
| 1039 | |
| 1040 if (element->type == TYPE_MASTER) { | |
| 1041 if (element->flags & DESC_FLAG_MULTI) | |
| 1042 ne_read_master(ctx, element); | |
| 1043 else | |
| 1044 ne_read_single_master(ctx, element); | |
| 1045 continue; | |
| 1046 } else { | |
| 1047 r = ne_read_simple(ctx, element, (size_t)size); | |
| 1048 if (r < 0) | |
| 1049 break; | |
| 1050 } | |
| 1051 } else if (ne_is_ancestor_element(id, ctx->ancestor->previous)) { | |
| 1052 ctx->log(ctx, NESTEGG_LOG_DEBUG, "parent element %llx", id); | |
| 1053 if (top_level && ctx->ancestor->node == top_level) { | |
| 1054 ctx->log(ctx, NESTEGG_LOG_DEBUG, "*** parse about to back up past top_le
vel"); | |
| 1055 r = 1; | |
| 1056 break; | |
| 1057 } | |
| 1058 ne_ctx_pop(ctx); | |
| 1059 } else { | |
| 1060 r = ne_read_element(ctx, &id, &size); | |
| 1061 if (r != 1) | |
| 1062 break; | |
| 1063 | |
| 1064 if (id != ID_VOID && id != ID_CRC32) | |
| 1065 ctx->log(ctx, NESTEGG_LOG_DEBUG, "unknown element %llx", id); | |
| 1066 r = ne_io_read_skip(ctx->io, (size_t)size); | |
| 1067 if (r != 1) | |
| 1068 break; | |
| 1069 } | |
| 1070 } | |
| 1071 | |
| 1072 if (r != 1) | |
| 1073 while (ctx->ancestor) | |
| 1074 ne_ctx_pop(ctx); | |
| 1075 | |
| 1076 return r; | |
| 1077 } | |
| 1078 | |
| 1079 static uint64_t | |
| 1080 ne_xiph_lace_value(unsigned char ** np) | |
| 1081 { | |
| 1082 uint64_t lace; | |
| 1083 uint64_t value; | |
| 1084 unsigned char * p = *np; | |
| 1085 | |
| 1086 lace = *p++; | |
| 1087 value = lace; | |
| 1088 while (lace == 255) { | |
| 1089 lace = *p++; | |
| 1090 value += lace; | |
| 1091 } | |
| 1092 | |
| 1093 *np = p; | |
| 1094 | |
| 1095 return value; | |
| 1096 } | |
| 1097 | |
| 1098 static int | |
| 1099 ne_read_xiph_lace_value(nestegg_io * io, uint64_t * value, size_t * consumed) | |
| 1100 { | |
| 1101 int r; | |
| 1102 uint64_t lace; | |
| 1103 | |
| 1104 r = ne_read_uint(io, &lace, 1); | |
| 1105 if (r != 1) | |
| 1106 return r; | |
| 1107 *consumed += 1; | |
| 1108 | |
| 1109 *value = lace; | |
| 1110 while (lace == 255) { | |
| 1111 r = ne_read_uint(io, &lace, 1); | |
| 1112 if (r != 1) | |
| 1113 return r; | |
| 1114 *consumed += 1; | |
| 1115 *value += lace; | |
| 1116 } | |
| 1117 | |
| 1118 return 1; | |
| 1119 } | |
| 1120 | |
| 1121 static int | |
| 1122 ne_read_xiph_lacing(nestegg_io * io, size_t block, size_t * read, uint64_t n, ui
nt64_t * sizes) | |
| 1123 { | |
| 1124 int r; | |
| 1125 size_t i = 0; | |
| 1126 uint64_t sum = 0; | |
| 1127 | |
| 1128 while (--n) { | |
| 1129 r = ne_read_xiph_lace_value(io, &sizes[i], read); | |
| 1130 if (r != 1) | |
| 1131 return r; | |
| 1132 sum += sizes[i]; | |
| 1133 i += 1; | |
| 1134 } | |
| 1135 | |
| 1136 if (*read + sum > block) | |
| 1137 return -1; | |
| 1138 | |
| 1139 /* Last frame is the remainder of the block. */ | |
| 1140 sizes[i] = block - *read - sum; | |
| 1141 return 1; | |
| 1142 } | |
| 1143 | |
| 1144 static int | |
| 1145 ne_read_ebml_lacing(nestegg_io * io, size_t block, size_t * read, uint64_t n, ui
nt64_t * sizes) | |
| 1146 { | |
| 1147 int r; | |
| 1148 uint64_t lace, sum, length; | |
| 1149 int64_t slace; | |
| 1150 size_t i = 0; | |
| 1151 | |
| 1152 r = ne_read_vint(io, &lace, &length); | |
| 1153 if (r != 1) | |
| 1154 return r; | |
| 1155 assert(length <= 8); | |
| 1156 *read += (size_t)length; | |
| 1157 | |
| 1158 sizes[i] = lace; | |
| 1159 sum = sizes[i]; | |
| 1160 | |
| 1161 i += 1; | |
| 1162 n -= 1; | |
| 1163 | |
| 1164 while (--n) { | |
| 1165 r = ne_read_svint(io, &slace, &length); | |
| 1166 if (r != 1) | |
| 1167 return r; | |
| 1168 assert(length <= 8); | |
| 1169 *read += (size_t)length; | |
| 1170 sizes[i] = sizes[i - 1] + slace; | |
| 1171 sum += sizes[i]; | |
| 1172 i += 1; | |
| 1173 } | |
| 1174 | |
| 1175 if (*read + sum > block) | |
| 1176 return -1; | |
| 1177 | |
| 1178 /* Last frame is the remainder of the block. */ | |
| 1179 sizes[i] = block - *read - sum; | |
| 1180 return 1; | |
| 1181 } | |
| 1182 | |
| 1183 static uint64_t | |
| 1184 ne_get_timecode_scale(nestegg * ctx) | |
| 1185 { | |
| 1186 uint64_t scale; | |
| 1187 | |
| 1188 if (ne_get_uint(ctx->segment.info.timecode_scale, &scale) != 0) | |
| 1189 scale = 1000000; | |
| 1190 | |
| 1191 return scale; | |
| 1192 } | |
| 1193 | |
| 1194 static int | |
| 1195 ne_map_track_number_to_index(nestegg * ctx, | |
| 1196 unsigned int track_number, | |
| 1197 unsigned int * track_index) | |
| 1198 { | |
| 1199 struct ebml_list_node * node; | |
| 1200 struct track_entry * t_entry; | |
| 1201 uint64_t t_number = 0; | |
| 1202 | |
| 1203 if (!track_index) | |
| 1204 return -1; | |
| 1205 *track_index = 0; | |
| 1206 | |
| 1207 if (track_number == 0) | |
| 1208 return -1; | |
| 1209 | |
| 1210 node = ctx->segment.tracks.track_entry.head; | |
| 1211 while (node) { | |
| 1212 assert(node->id == ID_TRACK_ENTRY); | |
| 1213 t_entry = node->data; | |
| 1214 if (ne_get_uint(t_entry->number, &t_number) != 0) | |
| 1215 return -1; | |
| 1216 if (t_number == track_number) | |
| 1217 return 0; | |
| 1218 *track_index += 1; | |
| 1219 node = node->next; | |
| 1220 } | |
| 1221 | |
| 1222 return -1; | |
| 1223 } | |
| 1224 | |
| 1225 static struct track_entry * | |
| 1226 ne_find_track_entry(nestegg * ctx, unsigned int track) | |
| 1227 { | |
| 1228 struct ebml_list_node * node; | |
| 1229 unsigned int tracks = 0; | |
| 1230 | |
| 1231 node = ctx->segment.tracks.track_entry.head; | |
| 1232 while (node) { | |
| 1233 assert(node->id == ID_TRACK_ENTRY); | |
| 1234 if (track == tracks) | |
| 1235 return node->data; | |
| 1236 tracks += 1; | |
| 1237 node = node->next; | |
| 1238 } | |
| 1239 | |
| 1240 return NULL; | |
| 1241 } | |
| 1242 | |
| 1243 static int | |
| 1244 ne_read_block(nestegg * ctx, uint64_t block_id, uint64_t block_size, nestegg_pac
ket ** data) | |
| 1245 { | |
| 1246 int r; | |
| 1247 int64_t timecode, abs_timecode; | |
| 1248 nestegg_packet * pkt; | |
| 1249 struct cluster * cluster; | |
| 1250 struct frame * f, * last; | |
| 1251 struct track_entry * entry; | |
| 1252 const int track_scale = 1; | |
| 1253 uint64_t track_number, length, frame_sizes[256], cluster_tc, flags, frames, tc
_scale, total; | |
| 1254 unsigned int i, lacing, track; | |
| 1255 size_t consumed = 0; | |
| 1256 | |
| 1257 *data = NULL; | |
| 1258 | |
| 1259 if (block_size > LIMIT_BLOCK) | |
| 1260 return -1; | |
| 1261 | |
| 1262 r = ne_read_vint(ctx->io, &track_number, &length); | |
| 1263 if (r != 1) | |
| 1264 return r; | |
| 1265 | |
| 1266 if (track_number == 0 || (unsigned int)track_number != track_number) | |
| 1267 return -1; | |
| 1268 | |
| 1269 assert(length <= 8); | |
| 1270 consumed += (size_t)length; | |
| 1271 | |
| 1272 r = ne_read_int(ctx->io, &timecode, 2); | |
| 1273 if (r != 1) | |
| 1274 return r; | |
| 1275 | |
| 1276 consumed += 2; | |
| 1277 | |
| 1278 r = ne_read_uint(ctx->io, &flags, 1); | |
| 1279 if (r != 1) | |
| 1280 return r; | |
| 1281 | |
| 1282 consumed += 1; | |
| 1283 | |
| 1284 frames = 0; | |
| 1285 | |
| 1286 /* Flags are different between Block and SimpleBlock, but lacing is | |
| 1287 encoded the same way. */ | |
| 1288 lacing = (flags & BLOCK_FLAGS_LACING) >> 1; | |
| 1289 | |
| 1290 switch (lacing) { | |
| 1291 case LACING_NONE: | |
| 1292 frames = 1; | |
| 1293 break; | |
| 1294 case LACING_XIPH: | |
| 1295 case LACING_FIXED: | |
| 1296 case LACING_EBML: | |
| 1297 r = ne_read_uint(ctx->io, &frames, 1); | |
| 1298 if (r != 1) | |
| 1299 return r; | |
| 1300 consumed += 1; | |
| 1301 frames += 1; | |
| 1302 } | |
| 1303 | |
| 1304 if (frames > 256) | |
| 1305 return -1; | |
| 1306 | |
| 1307 switch (lacing) { | |
| 1308 case LACING_NONE: | |
| 1309 frame_sizes[0] = block_size - consumed; | |
| 1310 break; | |
| 1311 case LACING_XIPH: | |
| 1312 if (frames == 1) | |
| 1313 return -1; | |
| 1314 r = ne_read_xiph_lacing(ctx->io, (size_t)block_size, &consumed, frames, fram
e_sizes); | |
| 1315 if (r != 1) | |
| 1316 return r; | |
| 1317 break; | |
| 1318 case LACING_FIXED: | |
| 1319 if ((block_size - consumed) % frames) | |
| 1320 return -1; | |
| 1321 for (i = 0; i < frames; ++i) | |
| 1322 frame_sizes[i] = (block_size - consumed) / frames; | |
| 1323 break; | |
| 1324 case LACING_EBML: | |
| 1325 if (frames == 1) | |
| 1326 return -1; | |
| 1327 r = ne_read_ebml_lacing(ctx->io, (size_t)block_size, &consumed, frames, fram
e_sizes); | |
| 1328 if (r != 1) | |
| 1329 return r; | |
| 1330 break; | |
| 1331 } | |
| 1332 | |
| 1333 /* Sanity check unlaced frame sizes against total block size. */ | |
| 1334 total = consumed; | |
| 1335 for (i = 0; i < frames; ++i) | |
| 1336 total += frame_sizes[i]; | |
| 1337 if (total > block_size) | |
| 1338 return -1; | |
| 1339 | |
| 1340 if (ne_map_track_number_to_index(ctx, (unsigned int)track_number, &track) != 0
) | |
| 1341 return -1; | |
| 1342 | |
| 1343 entry = ne_find_track_entry(ctx, track); | |
| 1344 if (!entry) | |
| 1345 return -1; | |
| 1346 | |
| 1347 tc_scale = ne_get_timecode_scale(ctx); | |
| 1348 | |
| 1349 assert(ctx->segment.cluster.tail->id == ID_CLUSTER); | |
| 1350 cluster = ctx->segment.cluster.tail->data; | |
| 1351 if (ne_get_uint(cluster->timecode, &cluster_tc) != 0) | |
| 1352 return -1; | |
| 1353 | |
| 1354 abs_timecode = timecode + cluster_tc; | |
| 1355 if (abs_timecode < 0) | |
| 1356 return -1; | |
| 1357 | |
| 1358 pkt = ne_alloc(sizeof(*pkt)); | |
| 1359 pkt->track = track; | |
| 1360 pkt->timecode = abs_timecode * tc_scale * track_scale; | |
| 1361 | |
| 1362 ctx->log(ctx, NESTEGG_LOG_DEBUG, "%sblock t %lld pts %f f %llx frames: %llu", | |
| 1363 block_id == ID_BLOCK ? "" : "simple", pkt->track, pkt->timecode / 1e9
, flags, frames); | |
| 1364 | |
| 1365 last = NULL; | |
| 1366 for (i = 0; i < frames; ++i) { | |
| 1367 if (frame_sizes[i] > LIMIT_FRAME) { | |
| 1368 nestegg_free_packet(pkt); | |
| 1369 return -1; | |
| 1370 } | |
| 1371 f = ne_alloc(sizeof(*f)); | |
| 1372 f->length = (size_t)frame_sizes[i]; | |
| 1373 f->data = ne_alloc(f->length); | |
| 1374 r = ne_io_read(ctx->io, f->data, f->length); | |
| 1375 if (r != 1) { | |
| 1376 free(f->data); | |
| 1377 free(f); | |
| 1378 nestegg_free_packet(pkt); | |
| 1379 return -1; | |
| 1380 } | |
| 1381 | |
| 1382 if (!last) | |
| 1383 pkt->frame = f; | |
| 1384 else | |
| 1385 last->next = f; | |
| 1386 last = f; | |
| 1387 } | |
| 1388 | |
| 1389 *data = pkt; | |
| 1390 | |
| 1391 return 1; | |
| 1392 } | |
| 1393 | |
| 1394 static int | |
| 1395 ne_read_discard_padding(nestegg * ctx, nestegg_packet * pkt) | |
| 1396 { | |
| 1397 int r; | |
| 1398 uint64_t id, size; | |
| 1399 struct ebml_element_desc * element; | |
| 1400 struct ebml_type * storage; | |
| 1401 | |
| 1402 r = ne_peek_element(ctx, &id, &size); | |
| 1403 if (r != 1) | |
| 1404 return r; | |
| 1405 | |
| 1406 if (id != ID_DISCARD_PADDING) | |
| 1407 return 1; | |
| 1408 | |
| 1409 element = ne_find_element(id, ctx->ancestor->node); | |
| 1410 if (!element) | |
| 1411 return 1; | |
| 1412 | |
| 1413 assert((size_t)size == size); | |
| 1414 r = ne_read_simple(ctx, element, (size_t)size); | |
| 1415 if (r != 1) | |
| 1416 return r; | |
| 1417 storage = (struct ebml_type *) (ctx->ancestor->data + element->offset); | |
| 1418 pkt->discard_padding = storage->v.i; | |
| 1419 | |
| 1420 return 1; | |
| 1421 } | |
| 1422 | |
| 1423 | |
| 1424 static uint64_t | |
| 1425 ne_buf_read_id(unsigned char const * p, size_t length) | |
| 1426 { | |
| 1427 uint64_t id = 0; | |
| 1428 | |
| 1429 while (length--) { | |
| 1430 id <<= 8; | |
| 1431 id |= *p++; | |
| 1432 } | |
| 1433 | |
| 1434 return id; | |
| 1435 } | |
| 1436 | |
| 1437 static struct seek * | |
| 1438 ne_find_seek_for_id(struct ebml_list_node * seek_head, uint64_t id) | |
| 1439 { | |
| 1440 struct ebml_list * head; | |
| 1441 struct ebml_list_node * seek; | |
| 1442 struct ebml_binary binary_id; | |
| 1443 struct seek * s; | |
| 1444 | |
| 1445 while (seek_head) { | |
| 1446 assert(seek_head->id == ID_SEEK_HEAD); | |
| 1447 head = seek_head->data; | |
| 1448 seek = head->head; | |
| 1449 | |
| 1450 while (seek) { | |
| 1451 assert(seek->id == ID_SEEK); | |
| 1452 s = seek->data; | |
| 1453 | |
| 1454 if (ne_get_binary(s->id, &binary_id) == 0 && | |
| 1455 ne_buf_read_id(binary_id.data, binary_id.length) == id) | |
| 1456 return s; | |
| 1457 | |
| 1458 seek = seek->next; | |
| 1459 } | |
| 1460 | |
| 1461 seek_head = seek_head->next; | |
| 1462 } | |
| 1463 | |
| 1464 return NULL; | |
| 1465 } | |
| 1466 | |
| 1467 static struct cue_track_positions * | |
| 1468 ne_find_cue_position_for_track(nestegg * ctx, struct ebml_list_node * node, unsi
gned int track) | |
| 1469 { | |
| 1470 struct cue_track_positions * pos = NULL; | |
| 1471 unsigned int track_number; | |
| 1472 unsigned int t; | |
| 1473 | |
| 1474 while (node) { | |
| 1475 assert(node->id == ID_CUE_TRACK_POSITIONS); | |
| 1476 pos = node->data; | |
| 1477 if (ne_get_uint32(pos->track, &track_number) != 0) | |
| 1478 return NULL; | |
| 1479 | |
| 1480 if (ne_map_track_number_to_index(ctx, track_number, &t) != 0) | |
| 1481 return NULL; | |
| 1482 | |
| 1483 if (t == track) | |
| 1484 return pos; | |
| 1485 | |
| 1486 node = node->next; | |
| 1487 } | |
| 1488 | |
| 1489 return NULL; | |
| 1490 } | |
| 1491 | |
| 1492 static struct cue_point * | |
| 1493 ne_find_cue_point_for_tstamp(nestegg * ctx, struct ebml_list_node * cue_point, u
nsigned int track, uint64_t scale, uint64_t tstamp) | |
| 1494 { | |
| 1495 uint64_t time; | |
| 1496 struct cue_point * c, * prev = NULL; | |
| 1497 | |
| 1498 while (cue_point) { | |
| 1499 assert(cue_point->id == ID_CUE_POINT); | |
| 1500 c = cue_point->data; | |
| 1501 | |
| 1502 if (!prev) | |
| 1503 prev = c; | |
| 1504 | |
| 1505 if (ne_get_uint(c->time, &time) == 0 && time * scale > tstamp) | |
| 1506 break; | |
| 1507 | |
| 1508 if (ne_find_cue_position_for_track(ctx, c->cue_track_positions.head, track)
!= NULL) | |
| 1509 prev = c; | |
| 1510 | |
| 1511 cue_point = cue_point->next; | |
| 1512 } | |
| 1513 | |
| 1514 return prev; | |
| 1515 } | |
| 1516 | |
| 1517 static int | |
| 1518 ne_is_suspend_element(uint64_t id) | |
| 1519 { | |
| 1520 if (id == ID_SIMPLE_BLOCK || id == ID_BLOCK) | |
| 1521 return 1; | |
| 1522 return 0; | |
| 1523 } | |
| 1524 | |
| 1525 static void | |
| 1526 ne_null_log_callback(nestegg * ctx, unsigned int severity, char const * fmt, ...
) | |
| 1527 { | |
| 1528 if (ctx && severity && fmt) | |
| 1529 return; | |
| 1530 } | |
| 1531 | |
| 1532 static int | |
| 1533 ne_init_cue_points(nestegg * ctx, int64_t max_offset) | |
| 1534 { | |
| 1535 int r; | |
| 1536 struct ebml_list_node * node = ctx->segment.cues.cue_point.head; | |
| 1537 struct seek * found; | |
| 1538 uint64_t seek_pos, id; | |
| 1539 struct saved_state state; | |
| 1540 | |
| 1541 /* If there are no cues loaded, check for cues element in the seek head | |
| 1542 and load it. */ | |
| 1543 if (!node) { | |
| 1544 found = ne_find_seek_for_id(ctx->segment.seek_head.head, ID_CUES); | |
| 1545 if (!found) | |
| 1546 return -1; | |
| 1547 | |
| 1548 if (ne_get_uint(found->position, &seek_pos) != 0) | |
| 1549 return -1; | |
| 1550 | |
| 1551 /* Save old parser state. */ | |
| 1552 r = ne_ctx_save(ctx, &state); | |
| 1553 if (r != 0) | |
| 1554 return -1; | |
| 1555 | |
| 1556 /* Seek and set up parser state for segment-level element (Cues). */ | |
| 1557 r = ne_io_seek(ctx->io, ctx->segment_offset + seek_pos, NESTEGG_SEEK_SET); | |
| 1558 if (r != 0) | |
| 1559 return -1; | |
| 1560 ctx->last_valid = 0; | |
| 1561 | |
| 1562 r = ne_read_element(ctx, &id, NULL); | |
| 1563 if (r != 1) | |
| 1564 return -1; | |
| 1565 | |
| 1566 if (id != ID_CUES) | |
| 1567 return -1; | |
| 1568 | |
| 1569 ctx->ancestor = NULL; | |
| 1570 ne_ctx_push(ctx, ne_top_level_elements, ctx); | |
| 1571 ne_ctx_push(ctx, ne_segment_elements, &ctx->segment); | |
| 1572 ne_ctx_push(ctx, ne_cues_elements, &ctx->segment.cues); | |
| 1573 /* parser will run until end of cues element. */ | |
| 1574 ctx->log(ctx, NESTEGG_LOG_DEBUG, "seek: parsing cue elements"); | |
| 1575 r = ne_parse(ctx, ne_cues_elements, max_offset); | |
| 1576 while (ctx->ancestor) | |
| 1577 ne_ctx_pop(ctx); | |
| 1578 | |
| 1579 /* Reset parser state to original state and seek back to old position. */ | |
| 1580 if (ne_ctx_restore(ctx, &state) != 0) | |
| 1581 return -1; | |
| 1582 | |
| 1583 if (r < 0) | |
| 1584 return -1; | |
| 1585 | |
| 1586 node = ctx->segment.cues.cue_point.head; | |
| 1587 if (!node) | |
| 1588 return -1; | |
| 1589 } | |
| 1590 | |
| 1591 return 0; | |
| 1592 } | |
| 1593 | |
| 1594 /* Three functions that implement the nestegg_io interface, operating on a | |
| 1595 * sniff_buffer. */ | |
| 1596 struct sniff_buffer { | |
| 1597 unsigned char const * buffer; | |
| 1598 size_t length; | |
| 1599 int64_t offset; | |
| 1600 }; | |
| 1601 | |
| 1602 static int | |
| 1603 ne_buffer_read(void * buffer, size_t length, void * user_data) | |
| 1604 { | |
| 1605 struct sniff_buffer * sb = user_data; | |
| 1606 | |
| 1607 int rv = 1; | |
| 1608 size_t available = sb->length - (size_t)sb->offset; | |
| 1609 | |
| 1610 if (available < length) | |
| 1611 return 0; | |
| 1612 | |
| 1613 memcpy(buffer, sb->buffer + sb->offset, length); | |
| 1614 sb->offset += length; | |
| 1615 | |
| 1616 return rv; | |
| 1617 } | |
| 1618 | |
| 1619 static int | |
| 1620 ne_buffer_seek(int64_t offset, int whence, void * user_data) | |
| 1621 { | |
| 1622 struct sniff_buffer * sb = user_data; | |
| 1623 int64_t o = sb->offset; | |
| 1624 | |
| 1625 switch(whence) { | |
| 1626 case NESTEGG_SEEK_SET: | |
| 1627 o = offset; | |
| 1628 break; | |
| 1629 case NESTEGG_SEEK_CUR: | |
| 1630 o += offset; | |
| 1631 break; | |
| 1632 case NESTEGG_SEEK_END: | |
| 1633 o = sb->length + offset; | |
| 1634 break; | |
| 1635 } | |
| 1636 | |
| 1637 if (o < 0 || o > (int64_t) sb->length) | |
| 1638 return -1; | |
| 1639 | |
| 1640 sb->offset = o; | |
| 1641 return 0; | |
| 1642 } | |
| 1643 | |
| 1644 static int64_t | |
| 1645 ne_buffer_tell(void * user_data) | |
| 1646 { | |
| 1647 struct sniff_buffer * sb = user_data; | |
| 1648 return sb->offset; | |
| 1649 } | |
| 1650 | |
| 1651 static int | |
| 1652 ne_match_webm(nestegg_io io, int64_t max_offset) | |
| 1653 { | |
| 1654 int r; | |
| 1655 uint64_t id; | |
| 1656 char * doctype; | |
| 1657 nestegg * ctx; | |
| 1658 | |
| 1659 if (!(io.read && io.seek && io.tell)) | |
| 1660 return -1; | |
| 1661 | |
| 1662 ctx = ne_alloc(sizeof(*ctx)); | |
| 1663 | |
| 1664 ctx->io = ne_alloc(sizeof(*ctx->io)); | |
| 1665 *ctx->io = io; | |
| 1666 ctx->alloc_pool = ne_pool_init(); | |
| 1667 ctx->log = ne_null_log_callback; | |
| 1668 | |
| 1669 r = ne_peek_element(ctx, &id, NULL); | |
| 1670 if (r != 1) { | |
| 1671 nestegg_destroy(ctx); | |
| 1672 return 0; | |
| 1673 } | |
| 1674 | |
| 1675 if (id != ID_EBML) { | |
| 1676 nestegg_destroy(ctx); | |
| 1677 return 0; | |
| 1678 } | |
| 1679 | |
| 1680 ne_ctx_push(ctx, ne_top_level_elements, ctx); | |
| 1681 | |
| 1682 /* we don't check the return value of ne_parse, that might fail because | |
| 1683 * max_offset is not on a valid element end point. We only want to check | |
| 1684 * the EBML ID and that the doctype is "webm". */ | |
| 1685 ne_parse(ctx, NULL, max_offset); | |
| 1686 | |
| 1687 if (ne_get_string(ctx->ebml.doctype, &doctype) != 0 || | |
| 1688 strcmp(doctype, "webm") != 0) { | |
| 1689 nestegg_destroy(ctx); | |
| 1690 return 0; | |
| 1691 } | |
| 1692 | |
| 1693 nestegg_destroy(ctx); | |
| 1694 | |
| 1695 return 1; | |
| 1696 } | |
| 1697 | |
| 1698 int | |
| 1699 nestegg_init(nestegg ** context, nestegg_io io, nestegg_log callback, int64_t ma
x_offset) | |
| 1700 { | |
| 1701 int r; | |
| 1702 uint64_t id, version, docversion; | |
| 1703 struct ebml_list_node * track; | |
| 1704 char * doctype; | |
| 1705 nestegg * ctx; | |
| 1706 | |
| 1707 if (!(io.read && io.seek && io.tell)) | |
| 1708 return -1; | |
| 1709 | |
| 1710 ctx = ne_alloc(sizeof(*ctx)); | |
| 1711 | |
| 1712 ctx->io = ne_alloc(sizeof(*ctx->io)); | |
| 1713 *ctx->io = io; | |
| 1714 ctx->log = callback; | |
| 1715 ctx->alloc_pool = ne_pool_init(); | |
| 1716 | |
| 1717 if (!ctx->log) | |
| 1718 ctx->log = ne_null_log_callback; | |
| 1719 | |
| 1720 r = ne_peek_element(ctx, &id, NULL); | |
| 1721 if (r != 1) { | |
| 1722 nestegg_destroy(ctx); | |
| 1723 return -1; | |
| 1724 } | |
| 1725 | |
| 1726 if (id != ID_EBML) { | |
| 1727 nestegg_destroy(ctx); | |
| 1728 return -1; | |
| 1729 } | |
| 1730 | |
| 1731 ctx->log(ctx, NESTEGG_LOG_DEBUG, "ctx %p", ctx); | |
| 1732 | |
| 1733 ne_ctx_push(ctx, ne_top_level_elements, ctx); | |
| 1734 | |
| 1735 r = ne_parse(ctx, NULL, max_offset); | |
| 1736 | |
| 1737 if (r != 1) { | |
| 1738 nestegg_destroy(ctx); | |
| 1739 return -1; | |
| 1740 } | |
| 1741 | |
| 1742 if (ne_get_uint(ctx->ebml.ebml_read_version, &version) != 0) | |
| 1743 version = 1; | |
| 1744 if (version != 1) { | |
| 1745 nestegg_destroy(ctx); | |
| 1746 return -1; | |
| 1747 } | |
| 1748 | |
| 1749 if (ne_get_string(ctx->ebml.doctype, &doctype) != 0) | |
| 1750 doctype = "matroska"; | |
| 1751 if (strcmp(doctype, "webm") != 0) { | |
| 1752 nestegg_destroy(ctx); | |
| 1753 return -1; | |
| 1754 } | |
| 1755 | |
| 1756 if (ne_get_uint(ctx->ebml.doctype_read_version, &docversion) != 0) | |
| 1757 docversion = 1; | |
| 1758 if (docversion < 1 || docversion > 2) { | |
| 1759 nestegg_destroy(ctx); | |
| 1760 return -1; | |
| 1761 } | |
| 1762 | |
| 1763 if (!ctx->segment.tracks.track_entry.head) { | |
| 1764 nestegg_destroy(ctx); | |
| 1765 return -1; | |
| 1766 } | |
| 1767 | |
| 1768 track = ctx->segment.tracks.track_entry.head; | |
| 1769 ctx->track_count = 0; | |
| 1770 | |
| 1771 while (track) { | |
| 1772 ctx->track_count += 1; | |
| 1773 track = track->next; | |
| 1774 } | |
| 1775 | |
| 1776 *context = ctx; | |
| 1777 | |
| 1778 return 0; | |
| 1779 } | |
| 1780 | |
| 1781 void | |
| 1782 nestegg_destroy(nestegg * ctx) | |
| 1783 { | |
| 1784 while (ctx->ancestor) | |
| 1785 ne_ctx_pop(ctx); | |
| 1786 ne_pool_destroy(ctx->alloc_pool); | |
| 1787 free(ctx->io); | |
| 1788 free(ctx); | |
| 1789 } | |
| 1790 | |
| 1791 int | |
| 1792 nestegg_duration(nestegg * ctx, uint64_t * duration) | |
| 1793 { | |
| 1794 uint64_t tc_scale; | |
| 1795 double unscaled_duration; | |
| 1796 | |
| 1797 if (ne_get_float(ctx->segment.info.duration, &unscaled_duration) != 0) | |
| 1798 return -1; | |
| 1799 | |
| 1800 tc_scale = ne_get_timecode_scale(ctx); | |
| 1801 | |
| 1802 *duration = (uint64_t) (unscaled_duration * tc_scale); | |
| 1803 return 0; | |
| 1804 } | |
| 1805 | |
| 1806 int | |
| 1807 nestegg_tstamp_scale(nestegg * ctx, uint64_t * scale) | |
| 1808 { | |
| 1809 *scale = ne_get_timecode_scale(ctx); | |
| 1810 return 0; | |
| 1811 } | |
| 1812 | |
| 1813 int | |
| 1814 nestegg_track_count(nestegg * ctx, unsigned int * tracks) | |
| 1815 { | |
| 1816 *tracks = ctx->track_count; | |
| 1817 return 0; | |
| 1818 } | |
| 1819 | |
| 1820 int | |
| 1821 nestegg_get_cue_point(nestegg * ctx, unsigned int cluster_num, int64_t max_offse
t, | |
| 1822 int64_t * start_pos, int64_t * end_pos, uint64_t * tstamp) | |
| 1823 { | |
| 1824 int range_obtained = 0; | |
| 1825 unsigned int cluster_count = 0; | |
| 1826 struct cue_point * cue_point; | |
| 1827 struct cue_track_positions * pos; | |
| 1828 uint64_t seek_pos, track_number, tc_scale, time; | |
| 1829 struct ebml_list_node * cues_node = ctx->segment.cues.cue_point.head; | |
| 1830 struct ebml_list_node * cue_pos_node = NULL; | |
| 1831 unsigned int track = 0, track_count = 0, track_index; | |
| 1832 | |
| 1833 if (!start_pos || !end_pos || !tstamp) | |
| 1834 return -1; | |
| 1835 | |
| 1836 /* Initialise return values */ | |
| 1837 *start_pos = -1; | |
| 1838 *end_pos = -1; | |
| 1839 *tstamp = 0; | |
| 1840 | |
| 1841 if (!cues_node) { | |
| 1842 ne_init_cue_points(ctx, max_offset); | |
| 1843 cues_node = ctx->segment.cues.cue_point.head; | |
| 1844 /* Verify cues have been added to context. */ | |
| 1845 if (!cues_node) | |
| 1846 return -1; | |
| 1847 } | |
| 1848 | |
| 1849 nestegg_track_count(ctx, &track_count); | |
| 1850 | |
| 1851 tc_scale = ne_get_timecode_scale(ctx); | |
| 1852 | |
| 1853 while (cues_node && !range_obtained) { | |
| 1854 assert(cues_node->id == ID_CUE_POINT); | |
| 1855 cue_point = cues_node->data; | |
| 1856 cue_pos_node = cue_point->cue_track_positions.head; | |
| 1857 while (cue_pos_node) { | |
| 1858 assert(cue_pos_node->id == ID_CUE_TRACK_POSITIONS); | |
| 1859 pos = cue_pos_node->data; | |
| 1860 for (track = 0; track < track_count; track++) { | |
| 1861 if (ne_get_uint(pos->track, &track_number) != 0) | |
| 1862 return -1; | |
| 1863 | |
| 1864 if (ne_map_track_number_to_index(ctx, (unsigned int)track_number, &track
_index) != 0) | |
| 1865 return -1; | |
| 1866 | |
| 1867 if (track_index == track) { | |
| 1868 if (ne_get_uint(pos->cluster_position, &seek_pos) != 0) | |
| 1869 return -1; | |
| 1870 if (cluster_count == cluster_num) { | |
| 1871 *start_pos = ctx->segment_offset+seek_pos; | |
| 1872 if (ne_get_uint(cue_point->time, &time) != 0) | |
| 1873 return -1; | |
| 1874 *tstamp = time * tc_scale; | |
| 1875 } else if (cluster_count == cluster_num+1) { | |
| 1876 *end_pos = (ctx->segment_offset+seek_pos)-1; | |
| 1877 range_obtained = 1; | |
| 1878 break; | |
| 1879 } | |
| 1880 cluster_count++; | |
| 1881 } | |
| 1882 } | |
| 1883 cue_pos_node = cue_pos_node->next; | |
| 1884 } | |
| 1885 cues_node = cues_node->next; | |
| 1886 } | |
| 1887 | |
| 1888 return 0; | |
| 1889 } | |
| 1890 | |
| 1891 int | |
| 1892 nestegg_offset_seek(nestegg * ctx, uint64_t offset) | |
| 1893 { | |
| 1894 int r; | |
| 1895 | |
| 1896 /* Seek and set up parser state for segment-level element (Cluster). */ | |
| 1897 r = ne_io_seek(ctx->io, offset, NESTEGG_SEEK_SET); | |
| 1898 if (r != 0) | |
| 1899 return -1; | |
| 1900 ctx->last_valid = 0; | |
| 1901 | |
| 1902 while (ctx->ancestor) | |
| 1903 ne_ctx_pop(ctx); | |
| 1904 | |
| 1905 ne_ctx_push(ctx, ne_top_level_elements, ctx); | |
| 1906 ne_ctx_push(ctx, ne_segment_elements, &ctx->segment); | |
| 1907 | |
| 1908 return 0; | |
| 1909 } | |
| 1910 | |
| 1911 int | |
| 1912 nestegg_track_seek(nestegg * ctx, unsigned int track, uint64_t tstamp) | |
| 1913 { | |
| 1914 int r; | |
| 1915 struct cue_point * cue_point; | |
| 1916 struct cue_track_positions * pos; | |
| 1917 uint64_t seek_pos, tc_scale; | |
| 1918 | |
| 1919 /* If there are no cues loaded, check for cues element in the seek head | |
| 1920 and load it. */ | |
| 1921 if (!ctx->segment.cues.cue_point.head) { | |
| 1922 r = ne_init_cue_points(ctx, -1); | |
| 1923 if (r != 0) | |
| 1924 return -1; | |
| 1925 } | |
| 1926 | |
| 1927 tc_scale = ne_get_timecode_scale(ctx); | |
| 1928 | |
| 1929 cue_point = ne_find_cue_point_for_tstamp(ctx, ctx->segment.cues.cue_point.head
, | |
| 1930 track, tc_scale, tstamp); | |
| 1931 if (!cue_point) | |
| 1932 return -1; | |
| 1933 | |
| 1934 pos = ne_find_cue_position_for_track(ctx, cue_point->cue_track_positions.head,
track); | |
| 1935 if (pos == NULL) | |
| 1936 return -1; | |
| 1937 | |
| 1938 if (ne_get_uint(pos->cluster_position, &seek_pos) != 0) | |
| 1939 return -1; | |
| 1940 | |
| 1941 /* Seek and set up parser state for segment-level element (Cluster). */ | |
| 1942 r = nestegg_offset_seek(ctx, ctx->segment_offset + seek_pos); | |
| 1943 ctx->log(ctx, NESTEGG_LOG_DEBUG, "seek: parsing cluster elements"); | |
| 1944 r = ne_parse(ctx, NULL, -1); | |
| 1945 if (r != 1) | |
| 1946 return -1; | |
| 1947 | |
| 1948 if (!ne_is_suspend_element(ctx->last_id)) | |
| 1949 return -1; | |
| 1950 | |
| 1951 return 0; | |
| 1952 } | |
| 1953 | |
| 1954 int | |
| 1955 nestegg_track_type(nestegg * ctx, unsigned int track) | |
| 1956 { | |
| 1957 struct track_entry * entry; | |
| 1958 uint64_t type; | |
| 1959 | |
| 1960 entry = ne_find_track_entry(ctx, track); | |
| 1961 if (!entry) | |
| 1962 return -1; | |
| 1963 | |
| 1964 if (ne_get_uint(entry->type, &type) != 0) | |
| 1965 return -1; | |
| 1966 | |
| 1967 if (type & TRACK_TYPE_VIDEO) | |
| 1968 return NESTEGG_TRACK_VIDEO; | |
| 1969 | |
| 1970 if (type & TRACK_TYPE_AUDIO) | |
| 1971 return NESTEGG_TRACK_AUDIO; | |
| 1972 | |
| 1973 return -1; | |
| 1974 } | |
| 1975 | |
| 1976 int | |
| 1977 nestegg_track_codec_id(nestegg * ctx, unsigned int track) | |
| 1978 { | |
| 1979 char * codec_id; | |
| 1980 struct track_entry * entry; | |
| 1981 | |
| 1982 entry = ne_find_track_entry(ctx, track); | |
| 1983 if (!entry) | |
| 1984 return -1; | |
| 1985 | |
| 1986 if (ne_get_string(entry->codec_id, &codec_id) != 0) | |
| 1987 return -1; | |
| 1988 | |
| 1989 if (strcmp(codec_id, TRACK_ID_VP8) == 0) | |
| 1990 return NESTEGG_CODEC_VP8; | |
| 1991 | |
| 1992 if (strcmp(codec_id, TRACK_ID_VP9) == 0) | |
| 1993 return NESTEGG_CODEC_VP9; | |
| 1994 | |
| 1995 if (strcmp(codec_id, TRACK_ID_VORBIS) == 0) | |
| 1996 return NESTEGG_CODEC_VORBIS; | |
| 1997 | |
| 1998 if (strcmp(codec_id, TRACK_ID_OPUS) == 0) | |
| 1999 return NESTEGG_CODEC_OPUS; | |
| 2000 | |
| 2001 return -1; | |
| 2002 } | |
| 2003 | |
| 2004 int | |
| 2005 nestegg_track_codec_data_count(nestegg * ctx, unsigned int track, | |
| 2006 unsigned int * count) | |
| 2007 { | |
| 2008 struct track_entry * entry; | |
| 2009 struct ebml_binary codec_private; | |
| 2010 unsigned char * p; | |
| 2011 | |
| 2012 *count = 0; | |
| 2013 | |
| 2014 entry = ne_find_track_entry(ctx, track); | |
| 2015 if (!entry) | |
| 2016 return -1; | |
| 2017 | |
| 2018 if (nestegg_track_codec_id(ctx, track) != NESTEGG_CODEC_VORBIS) | |
| 2019 return -1; | |
| 2020 | |
| 2021 if (ne_get_binary(entry->codec_private, &codec_private) != 0) | |
| 2022 return -1; | |
| 2023 | |
| 2024 if (codec_private.length < 1) | |
| 2025 return -1; | |
| 2026 | |
| 2027 p = codec_private.data; | |
| 2028 *count = *p + 1; | |
| 2029 | |
| 2030 if (*count > 3) | |
| 2031 return -1; | |
| 2032 | |
| 2033 return 0; | |
| 2034 } | |
| 2035 | |
| 2036 int | |
| 2037 nestegg_track_codec_data(nestegg * ctx, unsigned int track, unsigned int item, | |
| 2038 unsigned char ** data, size_t * length) | |
| 2039 { | |
| 2040 struct track_entry * entry; | |
| 2041 struct ebml_binary codec_private; | |
| 2042 uint64_t sizes[3], total; | |
| 2043 unsigned char * p; | |
| 2044 unsigned int count, i; | |
| 2045 | |
| 2046 *data = NULL; | |
| 2047 *length = 0; | |
| 2048 | |
| 2049 entry = ne_find_track_entry(ctx, track); | |
| 2050 if (!entry) | |
| 2051 return -1; | |
| 2052 | |
| 2053 if (nestegg_track_codec_id(ctx, track) != NESTEGG_CODEC_VORBIS | |
| 2054 && nestegg_track_codec_id(ctx, track) != NESTEGG_CODEC_OPUS) | |
| 2055 return -1; | |
| 2056 | |
| 2057 if (ne_get_binary(entry->codec_private, &codec_private) != 0) | |
| 2058 return -1; | |
| 2059 | |
| 2060 if (nestegg_track_codec_id(ctx, track) == NESTEGG_CODEC_VORBIS) { | |
| 2061 p = codec_private.data; | |
| 2062 count = *p++ + 1; | |
| 2063 | |
| 2064 if (count > 3) | |
| 2065 return -1; | |
| 2066 | |
| 2067 i = 0; | |
| 2068 total = 0; | |
| 2069 while (--count) { | |
| 2070 sizes[i] = ne_xiph_lace_value(&p); | |
| 2071 total += sizes[i]; | |
| 2072 i += 1; | |
| 2073 } | |
| 2074 sizes[i] = codec_private.length - total - (p - codec_private.data); | |
| 2075 | |
| 2076 for (i = 0; i < item; ++i) { | |
| 2077 if (sizes[i] > LIMIT_FRAME) | |
| 2078 return -1; | |
| 2079 p += sizes[i]; | |
| 2080 } | |
| 2081 *data = p; | |
| 2082 *length = (size_t)sizes[item]; | |
| 2083 } else { | |
| 2084 *data = codec_private.data; | |
| 2085 *length = codec_private.length; | |
| 2086 } | |
| 2087 | |
| 2088 return 0; | |
| 2089 } | |
| 2090 | |
| 2091 int | |
| 2092 nestegg_track_video_params(nestegg * ctx, unsigned int track, | |
| 2093 nestegg_video_params * params) | |
| 2094 { | |
| 2095 struct track_entry * entry; | |
| 2096 unsigned int value; | |
| 2097 | |
| 2098 memset(params, 0, sizeof(*params)); | |
| 2099 | |
| 2100 entry = ne_find_track_entry(ctx, track); | |
| 2101 if (!entry) | |
| 2102 return -1; | |
| 2103 | |
| 2104 if (nestegg_track_type(ctx, track) != NESTEGG_TRACK_VIDEO) | |
| 2105 return -1; | |
| 2106 | |
| 2107 value = 0; | |
| 2108 ne_get_uint32(entry->video.stereo_mode, &value); | |
| 2109 if (value <= NESTEGG_VIDEO_STEREO_TOP_BOTTOM || | |
| 2110 value == NESTEGG_VIDEO_STEREO_RIGHT_LEFT) | |
| 2111 params->stereo_mode = value; | |
| 2112 | |
| 2113 if (ne_get_uint32(entry->video.pixel_width, &value) != 0) | |
| 2114 return -1; | |
| 2115 params->width = value; | |
| 2116 | |
| 2117 if (ne_get_uint32(entry->video.pixel_height, &value) != 0) | |
| 2118 return -1; | |
| 2119 params->height = value; | |
| 2120 | |
| 2121 value = 0; | |
| 2122 ne_get_uint32(entry->video.pixel_crop_bottom, &value); | |
| 2123 params->crop_bottom = value; | |
| 2124 | |
| 2125 value = 0; | |
| 2126 ne_get_uint32(entry->video.pixel_crop_top, &value); | |
| 2127 params->crop_top = value; | |
| 2128 | |
| 2129 value = 0; | |
| 2130 ne_get_uint32(entry->video.pixel_crop_left, &value); | |
| 2131 params->crop_left = value; | |
| 2132 | |
| 2133 value = 0; | |
| 2134 ne_get_uint32(entry->video.pixel_crop_right, &value); | |
| 2135 params->crop_right = value; | |
| 2136 | |
| 2137 value = params->width; | |
| 2138 ne_get_uint32(entry->video.display_width, &value); | |
| 2139 params->display_width = value; | |
| 2140 | |
| 2141 value = params->height; | |
| 2142 ne_get_uint32(entry->video.display_height, &value); | |
| 2143 params->display_height = value; | |
| 2144 | |
| 2145 return 0; | |
| 2146 } | |
| 2147 | |
| 2148 int | |
| 2149 nestegg_track_audio_params(nestegg * ctx, unsigned int track, | |
| 2150 nestegg_audio_params * params) | |
| 2151 { | |
| 2152 struct track_entry * entry; | |
| 2153 unsigned int value; | |
| 2154 | |
| 2155 memset(params, 0, sizeof(*params)); | |
| 2156 | |
| 2157 entry = ne_find_track_entry(ctx, track); | |
| 2158 if (!entry) | |
| 2159 return -1; | |
| 2160 | |
| 2161 if (nestegg_track_type(ctx, track) != NESTEGG_TRACK_AUDIO) | |
| 2162 return -1; | |
| 2163 | |
| 2164 params->rate = 8000; | |
| 2165 ne_get_float(entry->audio.sampling_frequency, ¶ms->rate); | |
| 2166 | |
| 2167 value = 1; | |
| 2168 ne_get_uint32(entry->audio.channels, &value); | |
| 2169 params->channels = value; | |
| 2170 | |
| 2171 value = 16; | |
| 2172 ne_get_uint32(entry->audio.bit_depth, &value); | |
| 2173 params->depth = value; | |
| 2174 | |
| 2175 value = 0; | |
| 2176 ne_get_uint32(entry->codec_delay, &value); | |
| 2177 params->codec_delay = value; | |
| 2178 | |
| 2179 value = 0; | |
| 2180 ne_get_uint32(entry->seek_preroll, &value); | |
| 2181 params->seek_preroll = value; | |
| 2182 | |
| 2183 return 0; | |
| 2184 } | |
| 2185 | |
| 2186 int | |
| 2187 nestegg_read_packet(nestegg * ctx, nestegg_packet ** pkt) | |
| 2188 { | |
| 2189 int r; | |
| 2190 uint64_t id, size; | |
| 2191 | |
| 2192 *pkt = NULL; | |
| 2193 | |
| 2194 for (;;) { | |
| 2195 r = ne_peek_element(ctx, &id, &size); | |
| 2196 if (r != 1) | |
| 2197 return r; | |
| 2198 | |
| 2199 /* Any DESC_FLAG_SUSPEND fields must be handled here. */ | |
| 2200 if (ne_is_suspend_element(id)) { | |
| 2201 r = ne_read_element(ctx, &id, &size); | |
| 2202 if (r != 1) | |
| 2203 return r; | |
| 2204 | |
| 2205 /* The only DESC_FLAG_SUSPEND fields are Blocks and SimpleBlocks, which we | |
| 2206 handle directly. */ | |
| 2207 r = ne_read_block(ctx, id, size, pkt); | |
| 2208 if (r != 1) | |
| 2209 return r; | |
| 2210 | |
| 2211 r = ne_read_discard_padding(ctx, *pkt); | |
| 2212 if (r != 1) | |
| 2213 return r; | |
| 2214 | |
| 2215 return r; | |
| 2216 } | |
| 2217 | |
| 2218 r = ne_parse(ctx, NULL, -1); | |
| 2219 if (r != 1) | |
| 2220 return r; | |
| 2221 } | |
| 2222 | |
| 2223 return 1; | |
| 2224 } | |
| 2225 | |
| 2226 void | |
| 2227 nestegg_free_packet(nestegg_packet * pkt) | |
| 2228 { | |
| 2229 struct frame * frame; | |
| 2230 | |
| 2231 while (pkt->frame) { | |
| 2232 frame = pkt->frame; | |
| 2233 pkt->frame = frame->next; | |
| 2234 free(frame->data); | |
| 2235 free(frame); | |
| 2236 } | |
| 2237 | |
| 2238 free(pkt); | |
| 2239 } | |
| 2240 | |
| 2241 int | |
| 2242 nestegg_packet_track(nestegg_packet * pkt, unsigned int * track) | |
| 2243 { | |
| 2244 *track = (unsigned int)pkt->track; | |
| 2245 return 0; | |
| 2246 } | |
| 2247 | |
| 2248 int | |
| 2249 nestegg_packet_tstamp(nestegg_packet * pkt, uint64_t * tstamp) | |
| 2250 { | |
| 2251 *tstamp = pkt->timecode; | |
| 2252 return 0; | |
| 2253 } | |
| 2254 | |
| 2255 int | |
| 2256 nestegg_packet_discard_padding(nestegg_packet * pkt, int64_t * discard_padding) | |
| 2257 { | |
| 2258 *discard_padding = pkt->discard_padding; | |
| 2259 return 0; | |
| 2260 } | |
| 2261 | |
| 2262 int | |
| 2263 nestegg_packet_count(nestegg_packet * pkt, unsigned int * count) | |
| 2264 { | |
| 2265 struct frame * f = pkt->frame; | |
| 2266 | |
| 2267 *count = 0; | |
| 2268 | |
| 2269 while (f) { | |
| 2270 *count += 1; | |
| 2271 f = f->next; | |
| 2272 } | |
| 2273 | |
| 2274 return 0; | |
| 2275 } | |
| 2276 | |
| 2277 int | |
| 2278 nestegg_packet_data(nestegg_packet * pkt, unsigned int item, | |
| 2279 unsigned char ** data, size_t * length) | |
| 2280 { | |
| 2281 struct frame * f = pkt->frame; | |
| 2282 unsigned int count = 0; | |
| 2283 | |
| 2284 *data = NULL; | |
| 2285 *length = 0; | |
| 2286 | |
| 2287 while (f) { | |
| 2288 if (count == item) { | |
| 2289 *data = f->data; | |
| 2290 *length = f->length; | |
| 2291 return 0; | |
| 2292 } | |
| 2293 count += 1; | |
| 2294 f = f->next; | |
| 2295 } | |
| 2296 | |
| 2297 return -1; | |
| 2298 } | |
| 2299 | |
| 2300 int | |
| 2301 nestegg_has_cues(nestegg * ctx) | |
| 2302 { | |
| 2303 return ctx->segment.cues.cue_point.head || | |
| 2304 ne_find_seek_for_id(ctx->segment.seek_head.head, ID_CUES); | |
| 2305 } | |
| 2306 | |
| 2307 int | |
| 2308 nestegg_sniff(unsigned char const * buffer, size_t length) | |
| 2309 { | |
| 2310 nestegg_io io; | |
| 2311 struct sniff_buffer user_data; | |
| 2312 | |
| 2313 user_data.buffer = buffer; | |
| 2314 user_data.length = length; | |
| 2315 user_data.offset = 0; | |
| 2316 | |
| 2317 io.read = ne_buffer_read; | |
| 2318 io.seek = ne_buffer_seek; | |
| 2319 io.tell = ne_buffer_tell; | |
| 2320 io.userdata = &user_data; | |
| 2321 return ne_match_webm(io, length); | |
| 2322 } | |
| 2323 | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 341293003:
libvpx: Pull from upstream (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/deps/third_party/libvpx/