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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 | |
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