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1 | /* | |
2 | * Copyright (C) 2013 nu774 | |
3 | * For conditions of distribution and use, see copyright notice in COPYING | |
4 | */ | |
5 | #if HAVE_CONFIG_H | |
6 | # include "config.h" | |
7 | #endif | |
8 | #include <stdio.h> | |
9 | #include <stdlib.h> | |
10 | #include <string.h> | |
11 | #include <assert.h> | |
12 | #include <time.h> | |
13 | #if HAVE_STDINT_H | |
14 | # include <stdint.h> | |
15 | #endif | |
16 | #if HAVE_INTTYPES_H | |
17 | # include <inttypes.h> | |
18 | #elif defined _MSC_VER | |
19 | # define PRId64 "I64d" | |
20 | #endif | |
21 | #include "m4af.h" | |
22 | #include "m4af_endian.h" | |
23 | ||
24 | #define m4af_realloc(memory,size) realloc(memory, size) | |
25 | #define m4af_free(memory) free(memory) | |
26 | #define m4af_max(a,b) ((a)<(b)?(b):(a)) | |
27 | ||
28 | #define M4AF_ATOM_WILD 0xffffffff | |
29 | ||
30 | typedef struct m4af_sample_entry_t { | |
31 | uint32_t size; | |
32 | uint32_t delta; | |
33 | } m4af_sample_entry_t; | |
34 | ||
35 | typedef struct m4af_chunk_entry_t { | |
36 | int64_t offset; | |
37 | uint32_t size; | |
38 | uint32_t samples_per_chunk; | |
39 | uint32_t duration; | |
40 | } m4af_chunk_entry_t; | |
41 | ||
42 | typedef struct m4af_track_t { | |
43 | uint32_t codec; | |
44 | uint32_t timescale; | |
45 | int64_t creation_time; | |
46 | int64_t modification_time; | |
47 | int64_t duration; | |
48 | uint32_t frame_duration; | |
49 | uint32_t encoder_delay; | |
50 | uint32_t padding; | |
51 | uint8_t *decSpecificInfo; | |
52 | uint32_t decSpecificInfoSize; | |
53 | uint32_t bufferSizeDB; | |
54 | uint32_t maxBitrate; | |
55 | uint32_t avgBitrate; | |
56 | int is_vbr; | |
57 | ||
58 | m4af_sample_entry_t *sample_table; | |
59 | uint32_t num_samples; | |
60 | uint32_t sample_table_capacity; | |
61 | ||
62 | m4af_chunk_entry_t *chunk_table; | |
63 | uint32_t num_chunks; | |
64 | uint32_t chunk_table_capacity; | |
65 | ||
66 | uint8_t *chunk_buffer; | |
67 | uint32_t chunk_size; | |
68 | uint32_t chunk_capacity; | |
69 | ||
70 | /* temporary, to help parsing */ | |
71 | uint64_t stsc_pos; | |
72 | uint64_t stsc_size; | |
73 | ||
74 | uint64_t stts_pos; | |
75 | uint64_t stts_size; | |
76 | } m4af_track_t; | |
77 | ||
78 | struct m4af_ctx_t { | |
79 | uint32_t timescale; | |
80 | int64_t creation_time; | |
81 | int64_t modification_time; | |
82 | int64_t mdat_pos; | |
83 | int64_t mdat_size; | |
84 | int priming_mode; | |
85 | int last_error; | |
86 | ||
87 | m4af_itmf_entry_t *itmf_table; | |
88 | uint32_t num_tags; | |
89 | uint32_t itmf_table_capacity; | |
90 | ||
91 | m4af_io_callbacks_t io; | |
92 | void *io_cookie; | |
93 | ||
94 | uint16_t num_tracks; | |
95 | m4af_track_t track[2]; | |
96 | ||
97 | m4af_itmf_entry_t current_tag; | |
98 | }; | |
99 | ||
100 | typedef struct m4af_box_parser_t { | |
101 | uint32_t name; | |
102 | int (*handler)(m4af_ctx_t *ctx, uint32_t name, uint64_t size); | |
103 | } m4af_box_parser_t; | |
104 | ||
105 | static | |
106 | int64_t m4af_timestamp(void) | |
107 | { | |
108 | return (int64_t)(time(0)) + (((1970 - 1904) * 365) + 17) * 24 * 60 * 60; | |
109 | } | |
110 | ||
111 | /* | |
112 | * http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2 | |
113 | */ | |
114 | static | |
115 | uint32_t m4af_roundup(uint32_t n) | |
116 | { | |
117 | n--; | |
118 | n |= n >> 1; | |
119 | n |= n >> 2; | |
120 | n |= n >> 4; | |
121 | n |= n >> 8; | |
122 | n |= n >> 16; | |
123 | n++; | |
124 | return n; | |
125 | } | |
126 | ||
127 | static | |
128 | int64_t m4af_tell(m4af_ctx_t *ctx) | |
129 | { | |
130 | int64_t pos = -1; | |
131 | if ((pos = ctx->io.tell(ctx->io_cookie)) < 0) | |
132 | ctx->last_error = M4AF_IO_ERROR; | |
133 | return pos; | |
134 | } | |
135 | ||
136 | static | |
137 | int m4af_set_pos(m4af_ctx_t *ctx, int64_t pos) | |
138 | { | |
139 | int rc = -1; | |
140 | if ((rc = ctx->io.seek(ctx->io_cookie, pos, SEEK_SET)) < 0) | |
141 | ctx->last_error = M4AF_IO_ERROR; | |
142 | return rc; | |
143 | } | |
144 | ||
145 | static | |
146 | int m4af_write(m4af_ctx_t *ctx, const void *data, uint32_t size) | |
147 | { | |
148 | int rc = -1; | |
149 | if ((rc = ctx->io.write(ctx->io_cookie, data, size)) < 0) | |
150 | ctx->last_error = M4AF_IO_ERROR; | |
151 | return rc; | |
152 | } | |
153 | ||
154 | static | |
155 | int m4af_write16(m4af_ctx_t *ctx, uint32_t data) | |
156 | { | |
157 | data = m4af_htob16(data); | |
158 | return m4af_write(ctx, &data, 2); | |
159 | } | |
160 | ||
161 | static | |
162 | int m4af_write32(m4af_ctx_t *ctx, uint32_t data) | |
163 | { | |
164 | data = m4af_htob32(data); | |
165 | return m4af_write(ctx, &data, 4); | |
166 | } | |
167 | ||
168 | static | |
169 | int m4af_write64(m4af_ctx_t *ctx, uint64_t data) | |
170 | { | |
171 | data = m4af_htob64(data); | |
172 | return m4af_write(ctx, &data, 8); | |
173 | } | |
174 | ||
175 | static | |
176 | int m4af_write24(m4af_ctx_t *ctx, uint32_t data) | |
177 | { | |
178 | data = m4af_htob32(data << 8); | |
179 | return m4af_write(ctx, &data, 3); | |
180 | } | |
181 | ||
182 | static | |
183 | void m4af_write32_at(m4af_ctx_t *ctx, int64_t pos, uint32_t value) | |
184 | { | |
185 | int64_t current_pos = m4af_tell(ctx); | |
186 | m4af_set_pos(ctx, pos); | |
187 | m4af_write32(ctx, value); | |
188 | m4af_set_pos(ctx, current_pos); | |
189 | } | |
190 | ||
191 | m4af_ctx_t *m4af_create(uint32_t codec, uint32_t timescale, | |
192 | m4af_io_callbacks_t *io, void *io_cookie) | |
193 | { | |
194 | m4af_ctx_t *ctx; | |
195 | int64_t timestamp; | |
196 | ||
197 | if (codec != M4AF_FOURCC('m','p','4','a') && | |
198 | codec != M4AF_FOURCC('a','l','a','c')) | |
199 | return 0; | |
200 | if ((ctx = m4af_realloc(0, sizeof(m4af_ctx_t))) == 0) | |
201 | return 0; | |
202 | memset(ctx, 0, sizeof(m4af_ctx_t)); | |
203 | memcpy(&ctx->io, io, sizeof(m4af_io_callbacks_t)); | |
204 | ctx->io_cookie = io_cookie; | |
205 | ctx->timescale = timescale; | |
206 | timestamp = m4af_timestamp(); | |
207 | ctx->creation_time = timestamp; | |
208 | ctx->modification_time = timestamp; | |
209 | ctx->num_tracks = 1; | |
210 | ctx->track[0].codec = codec; | |
211 | ctx->track[0].timescale = timescale; | |
212 | ctx->track[0].creation_time = timestamp; | |
213 | ctx->track[0].modification_time = timestamp; | |
214 | return ctx; | |
215 | } | |
216 | ||
217 | static | |
218 | void m4af_free_itmf_table(m4af_ctx_t *ctx) | |
219 | { | |
220 | uint32_t i; | |
221 | m4af_itmf_entry_t *entry = ctx->itmf_table; | |
222 | for (i = 0; i < ctx->num_tags; ++i, ++entry) { | |
223 | if (entry->fcc == M4AF_FOURCC('-','-','-','-')) | |
224 | m4af_free(entry->name); | |
225 | m4af_free(entry->data); | |
226 | } | |
227 | m4af_free(ctx->itmf_table); | |
228 | } | |
229 | ||
230 | static | |
231 | void m4af_clear_track(m4af_ctx_t *ctx, int track_idx) | |
232 | { | |
233 | m4af_track_t *track = ctx->track + track_idx; | |
234 | if (track->decSpecificInfo) | |
235 | m4af_free(track->decSpecificInfo); | |
236 | if (track->sample_table) | |
237 | m4af_free(track->sample_table); | |
238 | if (track->chunk_table) | |
239 | m4af_free(track->chunk_table); | |
240 | if (track->chunk_buffer) | |
241 | m4af_free(track->chunk_buffer); | |
242 | memset(track, 0, sizeof(m4af_track_t)); | |
243 | } | |
244 | ||
245 | void m4af_teardown(m4af_ctx_t **ctxp) | |
246 | { | |
247 | unsigned i; | |
248 | m4af_ctx_t *ctx = *ctxp; | |
249 | for (i = 0; i < ctx->num_tracks; ++i) | |
250 | m4af_clear_track(ctx, i); | |
251 | if (ctx->itmf_table) | |
252 | m4af_free_itmf_table(ctx); | |
253 | m4af_free(ctx); | |
254 | *ctxp = 0; | |
255 | } | |
256 | ||
257 | void m4af_set_fixed_frame_duration(m4af_ctx_t *ctx, uint32_t track_idx, | |
258 | uint32_t length) | |
259 | { | |
260 | ctx->track[track_idx].frame_duration = length; | |
261 | } | |
262 | ||
263 | int m4af_set_decoder_specific_info(m4af_ctx_t *ctx, uint32_t track_idx, | |
264 | uint8_t *data, uint32_t size) | |
265 | { | |
266 | m4af_track_t *track = &ctx->track[track_idx]; | |
267 | if (size > track->decSpecificInfoSize) { | |
268 | uint8_t *memory = m4af_realloc(track->decSpecificInfo, size); | |
269 | if (memory == 0) { | |
270 | ctx->last_error = M4AF_NO_MEMORY; | |
271 | goto DONE; | |
272 | } | |
273 | track->decSpecificInfo = memory; | |
274 | } | |
275 | if (size > 0) | |
276 | memcpy(track->decSpecificInfo, data, size); | |
277 | track->decSpecificInfoSize = size; | |
278 | DONE: | |
279 | return ctx->last_error; | |
280 | } | |
281 | ||
282 | void m4af_set_vbr_mode(m4af_ctx_t *ctx, uint32_t track_idx, int is_vbr) | |
283 | { | |
284 | m4af_track_t *track = &ctx->track[track_idx]; | |
285 | track->is_vbr = is_vbr; | |
286 | } | |
287 | ||
288 | void m4af_set_priming(m4af_ctx_t *ctx, uint32_t track_idx, | |
289 | uint32_t encoder_delay, uint32_t padding) | |
290 | { | |
291 | m4af_track_t *track = &ctx->track[track_idx]; | |
292 | track->encoder_delay = encoder_delay; | |
293 | track->padding = padding; | |
294 | } | |
295 | ||
296 | void m4af_set_priming_mode(m4af_ctx_t *ctx, int mode) | |
297 | { | |
298 | ctx->priming_mode = mode; | |
299 | } | |
300 | ||
301 | static | |
302 | int m4af_add_sample_entry(m4af_ctx_t *ctx, uint32_t track_idx, | |
303 | uint32_t size, uint32_t delta) | |
304 | { | |
305 | m4af_track_t *track = &ctx->track[track_idx]; | |
306 | m4af_sample_entry_t *entry; | |
307 | ||
308 | if (ctx->last_error) | |
309 | return -1; | |
310 | if (track->num_samples == track->sample_table_capacity) { | |
311 | uint32_t new_size = track->sample_table_capacity; | |
312 | new_size = new_size ? new_size * 2 : 1; | |
313 | entry = m4af_realloc(track->sample_table, new_size * sizeof(*entry)); | |
314 | if (entry == 0) { | |
315 | ctx->last_error = M4AF_NO_MEMORY; | |
316 | return -1; | |
317 | } | |
318 | track->sample_table = entry; | |
319 | track->sample_table_capacity = new_size; | |
320 | } | |
321 | entry = track->sample_table + track->num_samples; | |
322 | entry->size = size; | |
323 | entry->delta = delta; | |
324 | ++track->num_samples; | |
325 | return 0; | |
326 | } | |
327 | ||
328 | static | |
329 | int m4af_flush_chunk(m4af_ctx_t *ctx, uint32_t track_idx) | |
330 | { | |
331 | m4af_track_t *track = &ctx->track[track_idx]; | |
332 | m4af_chunk_entry_t *entry; | |
333 | if (!track->num_chunks || !track->chunk_size) | |
334 | return 0; | |
335 | entry = &track->chunk_table[track->num_chunks - 1]; | |
336 | entry->offset = m4af_tell(ctx); | |
337 | m4af_write(ctx, track->chunk_buffer, track->chunk_size); | |
338 | ctx->mdat_size += track->chunk_size; | |
339 | track->chunk_size = 0; | |
340 | return ctx->last_error ? -1 : 0; | |
341 | } | |
342 | ||
343 | static | |
344 | int m4af_add_chunk_entry(m4af_ctx_t *ctx, uint32_t track_idx) | |
345 | { | |
346 | m4af_track_t *track = &ctx->track[track_idx]; | |
347 | m4af_chunk_entry_t *entry; | |
348 | if (track->num_chunks == track->chunk_table_capacity) { | |
349 | uint32_t new_size = track->chunk_table_capacity; | |
350 | new_size = new_size ? new_size * 2 : 1; | |
351 | entry = m4af_realloc(track->chunk_table, new_size * sizeof(*entry)); | |
352 | if (entry == 0) { | |
353 | ctx->last_error = M4AF_NO_MEMORY; | |
354 | return -1; | |
355 | } | |
356 | track->chunk_table = entry; | |
357 | track->chunk_table_capacity = new_size; | |
358 | } | |
359 | memset(&track->chunk_table[track->num_chunks++], 0, | |
360 | sizeof(m4af_chunk_entry_t)); | |
361 | return 0; | |
362 | } | |
363 | ||
364 | static | |
365 | int m4af_update_chunk_table(m4af_ctx_t *ctx, uint32_t track_idx, | |
366 | uint32_t size, uint32_t delta) | |
367 | { | |
368 | m4af_track_t *track = &ctx->track[track_idx]; | |
369 | m4af_chunk_entry_t *entry; | |
370 | int add_new_chunk = 0; | |
371 | ||
372 | if (ctx->last_error) | |
373 | return -1; | |
374 | if (track->num_chunks == 0) | |
375 | add_new_chunk = 1; | |
376 | else { | |
377 | entry = &track->chunk_table[track->num_chunks - 1]; | |
378 | if (entry->duration + delta > track->timescale / 2) | |
379 | add_new_chunk = 1; | |
380 | } | |
381 | if (add_new_chunk) { | |
382 | m4af_flush_chunk(ctx, track_idx); | |
383 | if (m4af_add_chunk_entry(ctx, track_idx) < 0) | |
384 | return -1; | |
385 | } | |
386 | entry = &track->chunk_table[track->num_chunks - 1]; | |
387 | entry->size += size; | |
388 | ++entry->samples_per_chunk; | |
389 | entry->duration += delta; | |
390 | return 0; | |
391 | } | |
392 | ||
393 | static | |
394 | void m4af_update_max_bitrate(m4af_ctx_t *ctx, uint32_t track_idx) | |
395 | { | |
396 | m4af_track_t *track = &ctx->track[track_idx]; | |
397 | uint32_t duration = 0, size = 0, bitrate; | |
398 | m4af_sample_entry_t *ent = track->sample_table + track->num_samples - 1; | |
399 | ||
400 | for (; ent >= track->sample_table && duration < track->timescale; --ent) { | |
401 | duration += ent->delta; | |
402 | size += ent->size; | |
403 | } | |
404 | bitrate = (uint32_t)(size * 8.0 * track->timescale / duration + .5); | |
405 | if (bitrate > track->maxBitrate) | |
406 | track->maxBitrate = bitrate; | |
407 | } | |
408 | ||
409 | static | |
410 | int m4af_append_sample_to_chunk(m4af_ctx_t *ctx, uint32_t track_idx, | |
411 | const void *data, uint32_t size) | |
412 | { | |
413 | m4af_track_t *track = &ctx->track[track_idx]; | |
414 | uint32_t newsize = track->chunk_size + size; | |
415 | ||
416 | if (ctx->last_error) | |
417 | return -1; | |
418 | if (track->chunk_capacity < newsize) { | |
419 | uint32_t capacity = m4af_roundup(newsize); | |
420 | uint8_t *memory = realloc(track->chunk_buffer, capacity); | |
421 | if (!memory) { | |
422 | ctx->last_error = M4AF_NO_MEMORY; | |
423 | return -1; | |
424 | } | |
425 | track->chunk_buffer = memory; | |
426 | track->chunk_capacity = capacity; | |
427 | } | |
428 | memcpy(track->chunk_buffer + track->chunk_size, data, size); | |
429 | track->chunk_size = newsize; | |
430 | return 0; | |
431 | } | |
432 | ||
433 | int m4af_write_sample(m4af_ctx_t *ctx, uint32_t track_idx, const void *data, | |
434 | uint32_t size, uint32_t duration) | |
435 | { | |
436 | m4af_track_t *track = &ctx->track[track_idx]; | |
437 | if (track->frame_duration) | |
438 | duration = track->frame_duration; | |
439 | if (size > track->bufferSizeDB) | |
440 | track->bufferSizeDB = size; | |
441 | track->duration += duration; | |
442 | m4af_add_sample_entry(ctx, track_idx, size, duration); | |
443 | m4af_update_chunk_table(ctx, track_idx, size, duration); | |
444 | m4af_update_max_bitrate(ctx, track_idx); | |
445 | m4af_append_sample_to_chunk(ctx, track_idx, data, size); | |
446 | return ctx->last_error; | |
447 | } | |
448 | ||
449 | static | |
450 | m4af_itmf_entry_t *m4af_find_itmf_slot(m4af_ctx_t *ctx, uint32_t fcc, | |
451 | const char *name) | |
452 | { | |
453 | m4af_itmf_entry_t *entry = ctx->itmf_table; | |
454 | ||
455 | if (name) | |
456 | fcc = M4AF_FOURCC('-','-','-','-'); | |
457 | ||
458 | if (fcc != M4AF_TAG_ARTWORK) | |
459 | for (; entry != ctx->itmf_table + ctx->num_tags; ++entry) | |
460 | if (fcc == entry->fcc && (!name || !strcmp(name, entry->name))) | |
461 | return entry; | |
462 | ||
463 | if (ctx->num_tags == ctx->itmf_table_capacity) { | |
464 | uint32_t new_size = ctx->itmf_table_capacity; | |
465 | new_size = new_size ? new_size * 2 : 1; | |
466 | entry = m4af_realloc(ctx->itmf_table, new_size * sizeof(*entry)); | |
467 | if (entry == 0) { | |
468 | ctx->last_error = M4AF_NO_MEMORY; | |
469 | return 0; | |
470 | } | |
471 | ctx->itmf_table = entry; | |
472 | ctx->itmf_table_capacity = new_size; | |
473 | } | |
474 | entry = &ctx->itmf_table[ctx->num_tags++]; | |
475 | memset(entry, 0, sizeof(m4af_itmf_entry_t)); | |
476 | entry->fcc = fcc; | |
477 | if (name) { | |
478 | char *name_copy = m4af_realloc(0, strlen(name) + 1); | |
479 | if (!name_copy) { | |
480 | ctx->last_error = M4AF_NO_MEMORY; | |
481 | --ctx->num_tags; | |
482 | return 0; | |
483 | } | |
484 | strcpy(name_copy, name); | |
485 | entry->name = name_copy; | |
486 | } | |
487 | return entry; | |
488 | } | |
489 | ||
490 | int m4af_add_itmf_long_tag(m4af_ctx_t *ctx, const char *name, | |
491 | const char *data) | |
492 | { | |
493 | m4af_itmf_entry_t *entry; | |
494 | char *data_copy = 0; | |
495 | size_t name_len = strlen(name); | |
496 | size_t data_len = strlen(data); | |
497 | if (!name_len || !data_len) | |
498 | return 0; | |
499 | ||
500 | if ((entry = m4af_find_itmf_slot(ctx, 0, name)) == 0) | |
501 | goto FAIL; | |
502 | entry->type_code = M4AF_UTF8; | |
503 | if ((data_copy = m4af_realloc(entry->data, data_len)) == 0) { | |
504 | ctx->last_error = M4AF_NO_MEMORY; | |
505 | goto FAIL; | |
506 | } | |
507 | memcpy(data_copy, data, data_len); | |
508 | entry->data = data_copy; | |
509 | entry->data_size = data_len; | |
510 | return 0; | |
511 | FAIL: | |
512 | return ctx->last_error; | |
513 | } | |
514 | ||
515 | int m4af_add_itmf_short_tag(m4af_ctx_t *ctx, uint32_t fcc, | |
516 | uint32_t type_code, const void *data, | |
517 | uint32_t data_size) | |
518 | { | |
519 | m4af_itmf_entry_t *entry; | |
520 | char *data_copy = 0; | |
521 | ||
522 | if (!data_size) | |
523 | return 0; | |
524 | if ((entry = m4af_find_itmf_slot(ctx, fcc, 0)) == 0) | |
525 | goto FAIL; | |
526 | entry->type_code = type_code; | |
527 | if ((data_copy = m4af_realloc(entry->data, data_size)) == 0) { | |
528 | ctx->last_error = M4AF_NO_MEMORY; | |
529 | goto FAIL; | |
530 | } | |
531 | memcpy(data_copy, data, data_size); | |
532 | entry->data = data_copy; | |
533 | entry->data_size = data_size; | |
534 | return 0; | |
535 | FAIL: | |
536 | return ctx->last_error; | |
537 | } | |
538 | ||
539 | int m4af_add_itmf_string_tag(m4af_ctx_t *ctx, uint32_t fcc, const char *data) | |
540 | { | |
541 | return m4af_add_itmf_short_tag(ctx, fcc, M4AF_UTF8, data, strlen(data)); | |
542 | } | |
543 | ||
544 | int m4af_add_itmf_int8_tag(m4af_ctx_t *ctx, uint32_t fcc, int value) | |
545 | { | |
546 | uint8_t data = value; | |
547 | return m4af_add_itmf_short_tag(ctx, fcc, M4AF_INTEGER, &data, 1); | |
548 | } | |
549 | ||
550 | int m4af_add_itmf_int16_tag(m4af_ctx_t *ctx, uint32_t fcc, int value) | |
551 | { | |
552 | uint16_t data = m4af_htob16(value); | |
553 | return m4af_add_itmf_short_tag(ctx, fcc, M4AF_INTEGER, &data, 2); | |
554 | } | |
555 | ||
556 | int m4af_add_itmf_int32_tag(m4af_ctx_t *ctx, uint32_t fcc, uint32_t value) | |
557 | { | |
558 | uint32_t data = m4af_htob32(value); | |
559 | return m4af_add_itmf_short_tag(ctx, fcc, M4AF_INTEGER, &data, 4); | |
560 | } | |
561 | ||
562 | int m4af_add_itmf_int64_tag(m4af_ctx_t *ctx, uint32_t fcc, uint64_t value) | |
563 | { | |
564 | uint64_t data = m4af_htob64(value); | |
565 | return m4af_add_itmf_short_tag(ctx, fcc, M4AF_INTEGER, &data, 8); | |
566 | } | |
567 | ||
568 | int m4af_add_itmf_track_tag(m4af_ctx_t *ctx, int track, int total) | |
569 | { | |
570 | uint16_t data[4] = { 0 }; | |
571 | data[1] = m4af_htob16(track); | |
572 | data[2] = m4af_htob16(total); | |
573 | return m4af_add_itmf_short_tag(ctx, M4AF_FOURCC('t','r','k','n'), | |
574 | M4AF_IMPLICIT, &data, 8); | |
575 | } | |
576 | ||
577 | int m4af_add_itmf_disk_tag(m4af_ctx_t *ctx, int disk, int total) | |
578 | { | |
579 | uint16_t data[3] = { 0 }; | |
580 | data[1] = m4af_htob16(disk); | |
581 | data[2] = m4af_htob16(total); | |
582 | return m4af_add_itmf_short_tag(ctx, M4AF_FOURCC('d','i','s','k'), | |
583 | M4AF_IMPLICIT, &data, 6); | |
584 | } | |
585 | ||
586 | int m4af_add_itmf_genre_tag(m4af_ctx_t *ctx, int genre) | |
587 | { | |
588 | uint16_t data = m4af_htob16(genre); | |
589 | return m4af_add_itmf_short_tag(ctx, M4AF_FOURCC('g','n','r','e'), | |
590 | M4AF_IMPLICIT, &data, 2); | |
591 | } | |
592 | ||
593 | static | |
594 | int m4af_set_iTunSMPB(m4af_ctx_t *ctx) | |
595 | { | |
596 | const char *fmt = " 00000000 %08X %08X %08X%08X 00000000 00000000 " | |
597 | "00000000 00000000 00000000 00000000 00000000 00000000"; | |
598 | m4af_track_t *track = &ctx->track[0]; | |
599 | char buf[256]; | |
600 | uint64_t length = track->duration - track->encoder_delay - track->padding; | |
601 | sprintf(buf, fmt, track->encoder_delay, track->padding, | |
602 | (uint32_t)(length >> 32), (uint32_t)length); | |
603 | return m4af_add_itmf_long_tag(ctx, "iTunSMPB", buf); | |
604 | } | |
605 | ||
606 | static | |
607 | uint32_t m4af_update_box_size(m4af_ctx_t *ctx, int64_t pos) | |
608 | { | |
609 | int64_t current_pos = m4af_tell(ctx); | |
610 | m4af_set_pos(ctx, pos); | |
611 | m4af_write32(ctx, current_pos - pos); | |
612 | m4af_set_pos(ctx, current_pos); | |
613 | return current_pos - pos; | |
614 | } | |
615 | ||
616 | static | |
617 | void m4af_write_descriptor(m4af_ctx_t *ctx, uint32_t tag, uint32_t size) | |
618 | { | |
619 | uint8_t buf[5]; | |
620 | buf[0] = tag; | |
621 | buf[1] = ((size >> 21) | 0x80); | |
622 | buf[2] = ((size >> 14) | 0x80); | |
623 | buf[3] = ((size >> 7) | 0x80); | |
624 | buf[4] = (size & 0x7f); | |
625 | m4af_write(ctx, buf, 5); | |
626 | } | |
627 | ||
628 | static | |
629 | void m4af_write_ftyp_box(m4af_ctx_t *ctx) | |
630 | { | |
631 | m4af_write(ctx, "\0\0\0\040""ftypM4A \0\0\0\0M4A mp42isom\0\0\0\0", 32); | |
632 | } | |
633 | ||
634 | static | |
635 | void m4af_write_free_box(m4af_ctx_t *ctx, uint32_t size) | |
636 | { | |
637 | int64_t pos = m4af_tell(ctx); | |
638 | m4af_write32(ctx, size + 8); | |
639 | m4af_write(ctx, "free", 4); | |
640 | if (size > 0) | |
641 | m4af_set_pos(ctx, pos + size + 8); | |
642 | } | |
643 | ||
644 | int m4af_begin_write(m4af_ctx_t *ctx) | |
645 | { | |
646 | m4af_write_ftyp_box(ctx); | |
647 | m4af_write_free_box(ctx, 0); | |
648 | m4af_write(ctx, "\0\0\0\0mdat", 8); | |
649 | ctx->mdat_pos = m4af_tell(ctx); | |
650 | return ctx->last_error; | |
651 | } | |
652 | ||
653 | static | |
654 | void m4af_write_stco_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
655 | { | |
656 | m4af_track_t *track = &ctx->track[track_idx]; | |
657 | uint32_t i; | |
658 | m4af_chunk_entry_t *index = track->chunk_table; | |
659 | int is_co64 = (ctx->mdat_pos + ctx->mdat_size > UINT32_MAX); | |
660 | int64_t pos = m4af_tell(ctx); | |
661 | ||
662 | m4af_write32(ctx, 0); /* size */ | |
663 | m4af_write(ctx, is_co64 ? "co64" : "stco", 4); | |
664 | m4af_write32(ctx, 0); /* version and flags */ | |
665 | m4af_write32(ctx, track->num_chunks); | |
666 | for (i = 0; i < track->num_chunks; ++i, ++index) { | |
667 | if (is_co64) | |
668 | m4af_write64(ctx, index->offset); | |
669 | else | |
670 | m4af_write32(ctx, index->offset); | |
671 | } | |
672 | m4af_update_box_size(ctx, pos); | |
673 | } | |
674 | ||
675 | static | |
676 | void m4af_write_stsz_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
677 | { | |
678 | m4af_track_t *track = &ctx->track[track_idx]; | |
679 | m4af_sample_entry_t *index = track->sample_table; | |
680 | uint32_t i; | |
681 | int64_t pos = m4af_tell(ctx); | |
682 | m4af_write(ctx, | |
683 | "\0\0\0\0" /* size */ | |
684 | "stsz" /* type */ | |
685 | "\0" /* version */ | |
686 | "\0\0\0" /* flags */ | |
687 | "\0\0\0\0" /* sample_size: 0(variable) */ | |
688 | , 16); | |
689 | m4af_write32(ctx, track->num_samples); | |
690 | for (i = 0; i < track->num_samples; ++i, ++index) | |
691 | m4af_write32(ctx, index->size); | |
692 | m4af_update_box_size(ctx, pos); | |
693 | } | |
694 | ||
695 | static | |
696 | void m4af_write_stsc_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
697 | { | |
698 | m4af_track_t *track = &ctx->track[track_idx]; | |
699 | m4af_chunk_entry_t *index = track->chunk_table; | |
700 | uint32_t i, prev_samples_per_chunk = 0, entry_count = 0; | |
701 | int64_t pos = m4af_tell(ctx); | |
702 | m4af_write(ctx, | |
703 | "\0\0\0\0" /* size */ | |
704 | "stsc" /* type */ | |
705 | "\0" /* version */ | |
706 | "\0\0\0" /* flags */ | |
707 | "\0\0\0\0" /* entry_count */ | |
708 | , 16); | |
709 | ||
710 | for (i = 0; i < track->num_chunks; ++i, ++index) { | |
711 | if (index->samples_per_chunk != prev_samples_per_chunk) { | |
712 | ++entry_count; | |
713 | m4af_write32(ctx, i + 1); | |
714 | m4af_write32(ctx, index->samples_per_chunk); | |
715 | m4af_write32(ctx, 1); /* sample_description_index */ | |
716 | prev_samples_per_chunk = index->samples_per_chunk; | |
717 | } | |
718 | } | |
719 | m4af_write32_at(ctx, pos + 12, entry_count); | |
720 | m4af_update_box_size(ctx, pos); | |
721 | } | |
722 | ||
723 | static | |
724 | void m4af_write_stts_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
725 | { | |
726 | m4af_track_t *track = &ctx->track[track_idx]; | |
727 | m4af_sample_entry_t *index = track->sample_table; | |
728 | uint32_t i, prev_delta = 0, entry_count = 0, sample_count = 0; | |
729 | int64_t pos = m4af_tell(ctx); | |
730 | m4af_write(ctx, | |
731 | "\0\0\0\0" /* size */ | |
732 | "stts" /* type */ | |
733 | "\0" /* version */ | |
734 | "\0\0\0" /* flags */ | |
735 | "\0\0\0\0" /* entry_count */ | |
736 | , 16); | |
737 | ||
738 | for (i = 0; i < track->num_samples; ++i, ++index) { | |
739 | if (index->delta == prev_delta) | |
740 | ++sample_count; | |
741 | else { | |
742 | ++entry_count; | |
743 | if (sample_count) { | |
744 | m4af_write32(ctx, sample_count); | |
745 | m4af_write32(ctx, prev_delta); | |
746 | } | |
747 | prev_delta = index->delta; | |
748 | sample_count = 1; | |
749 | } | |
750 | } | |
751 | if (sample_count) { | |
752 | m4af_write32(ctx, sample_count); | |
753 | m4af_write32(ctx, prev_delta); | |
754 | } | |
755 | m4af_write32_at(ctx, pos + 12, entry_count); | |
756 | m4af_update_box_size(ctx, pos); | |
757 | } | |
758 | ||
759 | static | |
760 | void m4af_write_esds_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
761 | { | |
762 | m4af_track_t *track = &ctx->track[track_idx]; | |
763 | int64_t pos = m4af_tell(ctx); | |
764 | m4af_write(ctx, "\0\0\0\0esds", 8); | |
765 | m4af_write32(ctx, 0); /* version + flags */ | |
766 | ||
767 | /* ES_Descriptor */ | |
768 | m4af_write_descriptor(ctx, 3, 32 + track->decSpecificInfoSize); | |
769 | m4af_write(ctx, "\0\0\0", 3); | |
770 | /* DecoderConfigDescriptor */ | |
771 | m4af_write_descriptor(ctx, 4, 18 + track->decSpecificInfoSize); | |
772 | m4af_write(ctx, | |
773 | "\x40" /* objectTypeIndication: 0x40(Audio ISO/IEC 14496-3)*/ | |
774 | "\x15" /* streamType(6): 0x05(AudioStream) | |
775 | * upStream(1) : 0 | |
776 | * reserved(1) : 1 | |
777 | */ | |
778 | , 2); | |
779 | m4af_write24(ctx, track->bufferSizeDB); | |
780 | m4af_write32(ctx, track->maxBitrate); | |
781 | m4af_write32(ctx, track->is_vbr ? 0: track->avgBitrate); | |
782 | /* DecoderSpecificInfo */ | |
783 | m4af_write_descriptor(ctx, 5, track->decSpecificInfoSize); | |
784 | m4af_write(ctx, track->decSpecificInfo, track->decSpecificInfoSize); | |
785 | /* SLConfigDescriptor */ | |
786 | m4af_write_descriptor(ctx, 6, 1); | |
787 | m4af_write(ctx, "\002", 1); /* predefined */ | |
788 | ||
789 | m4af_update_box_size(ctx, pos); | |
790 | } | |
791 | ||
792 | static | |
793 | void m4af_write_alac_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
794 | { | |
795 | m4af_track_t *track = &ctx->track[track_idx]; | |
796 | int64_t pos = m4af_tell(ctx); | |
797 | m4af_write(ctx, | |
798 | "\0\0\0\0" /* size */ | |
799 | "alac" /* type */ | |
800 | "\0" /* version */ | |
801 | "\0\0\0" /* flags */ | |
802 | , 12); | |
803 | m4af_write(ctx, track->decSpecificInfo, track->decSpecificInfoSize); | |
804 | m4af_update_box_size(ctx, pos); | |
805 | } | |
806 | ||
807 | static | |
808 | void m4af_write_mp4a_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
809 | { | |
810 | m4af_track_t *track = &ctx->track[track_idx]; | |
811 | int64_t pos = m4af_tell(ctx); | |
812 | m4af_write32(ctx, 0); /* size */ | |
813 | m4af_write32(ctx, track->codec); /* mp4a or alac */ | |
814 | m4af_write(ctx, | |
815 | "\0\0\0\0\0\0" /* reserved */ | |
816 | "\0\001" /* data_reference_index: 1 */ | |
817 | "\0\0\0\0" /* reserved[0] */ | |
818 | "\0\0\0\0" /* reserved[1] */ | |
819 | "\0\002" /* channelcount: 2 */ | |
820 | "\0\020" /* samplesize: 16 */ | |
821 | "\0\0" /* pre_defined */ | |
822 | "\0\0" /* reserved */ | |
823 | ,24); | |
824 | if (track->codec == M4AF_FOURCC('m','p','4','a')) { | |
825 | m4af_write32(ctx, track->timescale << 16); | |
826 | m4af_write_esds_box(ctx, track_idx); | |
827 | } else { | |
828 | m4af_write32(ctx, 44100 << 16); | |
829 | m4af_write_alac_box(ctx, track_idx); | |
830 | } | |
831 | m4af_update_box_size(ctx, pos); | |
832 | } | |
833 | ||
834 | static | |
835 | void m4af_write_stsd_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
836 | { | |
837 | int64_t pos = m4af_tell(ctx); | |
838 | m4af_write(ctx, "\0\0\0\0stsd", 8); | |
839 | m4af_write(ctx, | |
840 | "\0" /* version */ | |
841 | "\0\0\0" /* flags */ | |
842 | "\0\0\0\001" /* entry_count: 1 */ | |
843 | , 8); | |
844 | m4af_write_mp4a_box(ctx, track_idx); | |
845 | m4af_update_box_size(ctx, pos); | |
846 | } | |
847 | ||
848 | static | |
849 | void m4af_write_sbgp_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
850 | { | |
851 | m4af_track_t *track = &ctx->track[track_idx]; | |
852 | m4af_write(ctx, | |
853 | "\0\0\0\034" /* size: 28 */ | |
854 | "sbgp" /* type */ | |
855 | "\0" /* version */ | |
856 | "\0\0\0" /* flags */ | |
857 | "roll" /* grouping_type */ | |
858 | "\0\0\0\001" /* entry_count: 1 */ | |
859 | , 20); | |
860 | m4af_write32(ctx, track->num_samples); | |
861 | m4af_write32(ctx, 1); /* group_description_index */ | |
862 | } | |
863 | ||
864 | static | |
865 | void m4af_write_sgpd_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
866 | { | |
867 | m4af_write(ctx, | |
868 | "\0\0\0\026" /* size: 22 */ | |
869 | "sgpd" /* type */ | |
870 | "\0" /* version */ | |
871 | "\0\0\0" /* flags */ | |
872 | "roll" /* grouping_type */ | |
873 | "\0\0\0\001" /* entry_count: 1 */ | |
874 | "\377\377" /* payload_data: -1 */ | |
875 | , 22); | |
876 | } | |
877 | ||
878 | static | |
879 | void m4af_write_stbl_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
880 | { | |
881 | m4af_track_t *track = &ctx->track[track_idx]; | |
882 | int64_t pos = m4af_tell(ctx); | |
883 | m4af_write(ctx, "\0\0\0\0stbl", 8); | |
884 | m4af_write_stsd_box(ctx, track_idx); | |
885 | if ((ctx->priming_mode & M4AF_PRIMING_MODE_EDTS) && | |
886 | (track->encoder_delay || track->padding)) { | |
887 | m4af_write_sbgp_box(ctx, track_idx); | |
888 | m4af_write_sgpd_box(ctx, track_idx); | |
889 | } | |
890 | m4af_write_stts_box(ctx, track_idx); | |
891 | m4af_write_stsc_box(ctx, track_idx); | |
892 | m4af_write_stsz_box(ctx, track_idx); | |
893 | m4af_write_stco_box(ctx, track_idx); | |
894 | m4af_update_box_size(ctx, pos); | |
895 | } | |
896 | ||
897 | static | |
898 | void m4af_write_url_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
899 | { | |
900 | m4af_write(ctx, | |
901 | "\0\0\0\014" /* size */ | |
902 | "url " /* type */ | |
903 | "\0" /* version */ | |
904 | "\0\0\001" /* flags: 1(in the same file) */ | |
905 | , 12); | |
906 | } | |
907 | ||
908 | static | |
909 | void m4af_write_dref_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
910 | { | |
911 | int64_t pos = m4af_tell(ctx); | |
912 | m4af_write(ctx, "\0\0\0\0dref", 8); | |
913 | m4af_write(ctx, | |
914 | "\0" /* version */ | |
915 | "\0\0\0" /* flags */ | |
916 | "\0\0\0\001" /* entry_count: 1 */ | |
917 | ,8); | |
918 | m4af_write_url_box(ctx, track_idx); | |
919 | m4af_update_box_size(ctx, pos); | |
920 | } | |
921 | ||
922 | static | |
923 | void m4af_write_dinf_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
924 | { | |
925 | int64_t pos = m4af_tell(ctx); | |
926 | m4af_write(ctx, "\0\0\0\0dinf", 8); | |
927 | m4af_write_dref_box(ctx, track_idx); | |
928 | m4af_update_box_size(ctx, pos); | |
929 | } | |
930 | ||
931 | static | |
932 | void m4af_write_smhd_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
933 | { | |
934 | m4af_write(ctx, | |
935 | "\0\0\0\020" /* size */ | |
936 | "smhd" /* type */ | |
937 | "\0" /* version */ | |
938 | "\0\0\0" /* flags */ | |
939 | "\0\0" /* balance */ | |
940 | "\0\0" /* reserved */ | |
941 | , 16); | |
942 | } | |
943 | ||
944 | static | |
945 | void m4af_write_minf_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
946 | { | |
947 | m4af_track_t *track = &ctx->track[track_idx]; | |
948 | int64_t pos = m4af_tell(ctx); | |
949 | m4af_write(ctx, "\0\0\0\0minf", 8); | |
950 | /* TODO: add TEXT support */ | |
951 | if (track->codec != M4AF_CODEC_TEXT) | |
952 | m4af_write_smhd_box(ctx, track_idx); | |
953 | m4af_write_dinf_box(ctx, track_idx); | |
954 | m4af_write_stbl_box(ctx, track_idx); | |
955 | m4af_update_box_size(ctx, pos); | |
956 | } | |
957 | ||
958 | static | |
959 | void m4af_write_mdhd_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
960 | { | |
961 | m4af_track_t *track = &ctx->track[track_idx]; | |
962 | int64_t pos = m4af_tell(ctx); | |
963 | uint8_t version = (track->creation_time > UINT32_MAX || | |
964 | track->modification_time > UINT32_MAX || | |
965 | track->duration > UINT32_MAX); | |
966 | ||
967 | m4af_write(ctx, "\0\0\0\0mdhd", 8); | |
968 | m4af_write(ctx, &version, 1); | |
969 | m4af_write(ctx, "\0\0\0", 3); /* flags */ | |
970 | if (version) { | |
971 | m4af_write64(ctx, track->creation_time); | |
972 | m4af_write64(ctx, track->modification_time); | |
973 | m4af_write32(ctx, track->timescale); | |
974 | m4af_write64(ctx, track->duration); | |
975 | } else { | |
976 | m4af_write32(ctx, track->creation_time); | |
977 | m4af_write32(ctx, track->modification_time); | |
978 | m4af_write32(ctx, track->timescale); | |
979 | m4af_write32(ctx, track->duration); | |
980 | } | |
981 | m4af_write(ctx, | |
982 | "\x55\xc4" /* language: und */ | |
983 | "\0\0" /* pre_defined */ | |
984 | , 4); | |
985 | m4af_update_box_size(ctx, pos); | |
986 | } | |
987 | ||
988 | static | |
989 | void m4af_write_hdlr_box(m4af_ctx_t *ctx, uint32_t track_idx, const char *type) | |
990 | { | |
991 | int64_t pos = m4af_tell(ctx); | |
992 | static const char reserved_and_name[10] = { 0 }; | |
993 | ||
994 | m4af_write(ctx, | |
995 | "\0\0\0\0" /* size */ | |
996 | "hdlr" /* type */ | |
997 | "\0" /* version */ | |
998 | "\0\0\0" /* flags */ | |
999 | "\0\0\0\0" /* pre_defined */ | |
1000 | , 16); | |
1001 | m4af_write(ctx, type, 4); /* handler_type */ | |
1002 | /* reserved[0] */ | |
1003 | m4af_write(ctx, !strcmp(type, "mdir") ? "appl" : "\0\0\0\0", 4); | |
1004 | /* reserved[1], reserved[2], name */ | |
1005 | m4af_write(ctx, reserved_and_name, (pos & 1) ? 9 : 10); | |
1006 | m4af_update_box_size(ctx, pos); | |
1007 | } | |
1008 | ||
1009 | static | |
1010 | void m4af_write_mdia_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
1011 | { | |
1012 | m4af_track_t *track = &ctx->track[track_idx]; | |
1013 | const char *hdlr = | |
1014 | (track->codec == M4AF_CODEC_TEXT) ? "text" : "soun"; | |
1015 | int64_t pos = m4af_tell(ctx); | |
1016 | m4af_write(ctx, "\0\0\0\0mdia", 8); | |
1017 | m4af_write_mdhd_box(ctx, track_idx); | |
1018 | m4af_write_hdlr_box(ctx, track_idx, hdlr); | |
1019 | m4af_write_minf_box(ctx, track_idx); | |
1020 | m4af_update_box_size(ctx, pos); | |
1021 | } | |
1022 | ||
1023 | static | |
1024 | void m4af_write_elst_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
1025 | { | |
1026 | m4af_track_t *track = &ctx->track[track_idx]; | |
1027 | uint8_t version; | |
1028 | int64_t duration = track->duration - track->encoder_delay - track->padding; | |
1029 | int64_t pos = m4af_tell(ctx); | |
1030 | duration = (double)duration / track->timescale * ctx->timescale + .5; | |
1031 | version = (duration > UINT32_MAX); | |
1032 | ||
1033 | m4af_write(ctx, "\0\0\0\0elst", 8); | |
1034 | m4af_write(ctx, &version, 1); | |
1035 | m4af_write(ctx, "\0\0\0", 3); /* flags */ | |
1036 | m4af_write32(ctx, 1); /* entry_count: 1 */ | |
1037 | if (version) { | |
1038 | m4af_write64(ctx, duration); | |
1039 | m4af_write64(ctx, track->encoder_delay); | |
1040 | } else { | |
1041 | m4af_write32(ctx, duration); | |
1042 | m4af_write32(ctx, track->encoder_delay); | |
1043 | } | |
1044 | m4af_write16(ctx, 1); /* media_rate_integer */ | |
1045 | m4af_write16(ctx, 0); /* media_rate_fraction */ | |
1046 | m4af_update_box_size(ctx, pos); | |
1047 | } | |
1048 | ||
1049 | static | |
1050 | void m4af_write_edts_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
1051 | { | |
1052 | int64_t pos = m4af_tell(ctx); | |
1053 | m4af_write(ctx, "\0\0\0\0edts", 8); | |
1054 | m4af_write_elst_box(ctx, track_idx); | |
1055 | m4af_update_box_size(ctx, pos); | |
1056 | } | |
1057 | ||
1058 | static | |
1059 | void m4af_write_tkhd_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
1060 | { | |
1061 | m4af_track_t *track = &ctx->track[track_idx]; | |
1062 | int64_t pos = m4af_tell(ctx); | |
1063 | int64_t duration = | |
1064 | (double)track->duration / track->timescale * ctx->timescale + .5; | |
1065 | uint8_t version = (track->creation_time > UINT32_MAX || | |
1066 | track->modification_time > UINT32_MAX || | |
1067 | duration > UINT32_MAX); | |
1068 | m4af_write(ctx, "\0\0\0\0tkhd", 8); | |
1069 | m4af_write(ctx, &version, 1); | |
1070 | m4af_write(ctx, "\0\0\007", 3); /* flags */ | |
1071 | if (version) { | |
1072 | m4af_write64(ctx, track->creation_time); | |
1073 | m4af_write64(ctx, track->modification_time); | |
1074 | m4af_write32(ctx, track_idx + 1); | |
1075 | m4af_write(ctx, "\0\0\0\0" /* reserved */ | |
1076 | , 4); | |
1077 | m4af_write64(ctx, duration); | |
1078 | } else { | |
1079 | m4af_write32(ctx, track->creation_time); | |
1080 | m4af_write32(ctx, track->modification_time); | |
1081 | m4af_write32(ctx, track_idx + 1); | |
1082 | m4af_write(ctx, "\0\0\0\0" /* reserved */ | |
1083 | , 4); | |
1084 | m4af_write32(ctx, duration); | |
1085 | } | |
1086 | m4af_write(ctx, | |
1087 | "\0\0\0\0" /* reserved[0] */ | |
1088 | "\0\0\0\0" /* reserved[1] */ | |
1089 | "\0\0" /* layer */ | |
1090 | "\0\0" /* alternate_group */ | |
1091 | "\001\0" /* volume: 1.0 */ | |
1092 | "\0\0" /* reserved */ | |
1093 | "\0\001\0\0" /* matrix[0] */ | |
1094 | "\0\0\0\0" /* matrix[1] */ | |
1095 | "\0\0\0\0" /* matrix[2] */ | |
1096 | "\0\0\0\0" /* matrix[3] */ | |
1097 | "\0\001\0\0" /* matrix[4] */ | |
1098 | "\0\0\0\0" /* matrix[5] */ | |
1099 | "\0\0\0\0" /* matrix[6] */ | |
1100 | "\0\0\0\0" /* matrix[7] */ | |
1101 | "\100\0\0\0" /* matrix[8] */ | |
1102 | "\0\0\0\0" /* width */ | |
1103 | "\0\0\0\0" /* height */ | |
1104 | , 60); | |
1105 | m4af_update_box_size(ctx, pos); | |
1106 | } | |
1107 | ||
1108 | static | |
1109 | void m4af_write_trak_box(m4af_ctx_t *ctx, uint32_t track_idx) | |
1110 | { | |
1111 | m4af_track_t *track = &ctx->track[track_idx]; | |
1112 | int64_t pos = m4af_tell(ctx); | |
1113 | m4af_write(ctx, "\0\0\0\0trak", 8); | |
1114 | m4af_write_tkhd_box(ctx, track_idx); | |
1115 | if ((ctx->priming_mode & M4AF_PRIMING_MODE_EDTS) && | |
1116 | (track->encoder_delay || track->padding)) | |
1117 | m4af_write_edts_box(ctx, track_idx); | |
1118 | m4af_write_mdia_box(ctx, track_idx); | |
1119 | m4af_update_box_size(ctx, pos); | |
1120 | } | |
1121 | ||
1122 | static | |
1123 | int64_t m4af_movie_duration(m4af_ctx_t *ctx) | |
1124 | { | |
1125 | int64_t movie_duration = 0; | |
1126 | unsigned i; | |
1127 | for (i = 0; i < ctx->num_tracks; ++i) { | |
1128 | double x = ctx->track[i].duration; | |
1129 | int64_t duration = x / ctx->track[i].timescale * ctx->timescale + .5; | |
1130 | if (duration > movie_duration) | |
1131 | movie_duration = duration; | |
1132 | } | |
1133 | return movie_duration; | |
1134 | } | |
1135 | ||
1136 | static | |
1137 | void m4af_write_mvhd_box(m4af_ctx_t *ctx) | |
1138 | { | |
1139 | int64_t pos = m4af_tell(ctx); | |
1140 | int64_t movie_duration = m4af_movie_duration(ctx); | |
1141 | uint8_t version = (ctx->creation_time > UINT32_MAX || | |
1142 | ctx->modification_time > UINT32_MAX || | |
1143 | movie_duration > UINT32_MAX); | |
1144 | ||
1145 | m4af_write(ctx, "\0\0\0\0mvhd", 8); | |
1146 | m4af_write(ctx, &version, 1); | |
1147 | m4af_write(ctx, "\0\0\0", 3); /* flags */ | |
1148 | if (version) { | |
1149 | m4af_write64(ctx, ctx->creation_time); | |
1150 | m4af_write64(ctx, ctx->modification_time); | |
1151 | m4af_write32(ctx, ctx->timescale); | |
1152 | m4af_write64(ctx, movie_duration); | |
1153 | } else { | |
1154 | m4af_write32(ctx, ctx->creation_time); | |
1155 | m4af_write32(ctx, ctx->modification_time); | |
1156 | m4af_write32(ctx, ctx->timescale); | |
1157 | m4af_write32(ctx, movie_duration); | |
1158 | } | |
1159 | m4af_write(ctx, | |
1160 | "\0\001\0\0" /* rate: 1.0 */ | |
1161 | "\001\0" /* volume: 1.0 */ | |
1162 | "\0\0" /* reserved */ | |
1163 | "\0\0\0\0" /* reserved[0] */ | |
1164 | "\0\0\0\0" /* reserved[1] */ | |
1165 | "\0\001\0\0" /* matrix[0] */ | |
1166 | "\0\0\0\0" /* matrix[1] */ | |
1167 | "\0\0\0\0" /* matrix[2] */ | |
1168 | "\0\0\0\0" /* matrix[3] */ | |
1169 | "\0\001\0\0" /* matrix[4] */ | |
1170 | "\0\0\0\0" /* matrix[5] */ | |
1171 | "\0\0\0\0" /* matrix[6] */ | |
1172 | "\0\0\0\0" /* matrix[7] */ | |
1173 | "\100\0\0\0" /* matrix[8] */ | |
1174 | "\0\0\0\0" /* pre_defined[0] */ | |
1175 | "\0\0\0\0" /* pre_defined[1] */ | |
1176 | "\0\0\0\0" /* pre_defined[2] */ | |
1177 | "\0\0\0\0" /* pre_defined[3] */ | |
1178 | "\0\0\0\0" /* pre_defined[4] */ | |
1179 | "\0\0\0\0" /* pre_defined[5] */ | |
1180 | , 76); | |
1181 | m4af_write32(ctx, ctx->num_tracks + 1); | |
1182 | m4af_update_box_size(ctx, pos); | |
1183 | } | |
1184 | ||
1185 | static | |
1186 | void m4af_write_mean_box(m4af_ctx_t *ctx) | |
1187 | { | |
1188 | m4af_write(ctx, | |
1189 | "\0\0\0\034" /* size */ | |
1190 | "mean" | |
1191 | "\0" /* version */ | |
1192 | "\0\0\0" /* flags */ | |
1193 | "com.apple.iTunes" /* meaning-string */ | |
1194 | , 28); | |
1195 | } | |
1196 | ||
1197 | static | |
1198 | void m4af_write_name_box(m4af_ctx_t *ctx, const char *name) | |
1199 | { | |
1200 | int64_t pos = m4af_tell(ctx); | |
1201 | m4af_write(ctx, | |
1202 | "\0\0\0\0" /* size */ | |
1203 | "name" /* type */ | |
1204 | "\0" /* version */ | |
1205 | "\0\0\0" /* flags */ | |
1206 | , 12); | |
1207 | m4af_write(ctx, name, strlen(name)); | |
1208 | m4af_update_box_size(ctx, pos); | |
1209 | } | |
1210 | ||
1211 | static | |
1212 | void m4af_write_data_box(m4af_ctx_t *ctx, uint32_t type_code, | |
1213 | const char *data, uint32_t data_size) | |
1214 | { | |
1215 | int64_t pos = m4af_tell(ctx); | |
1216 | uint8_t code = type_code; | |
1217 | m4af_write(ctx, | |
1218 | "\0\0\0\0" /* size */ | |
1219 | "data" /* type */ | |
1220 | "\0\0" /* reserved */ | |
1221 | "\0" /* type_set_indifier */ | |
1222 | ,11); | |
1223 | m4af_write(ctx, &code, 1); | |
1224 | m4af_write(ctx, "\0\0\0\0", 4); /* locale */ | |
1225 | m4af_write(ctx, data, data_size); | |
1226 | m4af_update_box_size(ctx, pos); | |
1227 | } | |
1228 | ||
1229 | static | |
1230 | void m4af_write_metadata(m4af_ctx_t *ctx, m4af_itmf_entry_t *entry) | |
1231 | { | |
1232 | int64_t pos = m4af_tell(ctx); | |
1233 | m4af_write(ctx, "\0\0\0\0", 4); | |
1234 | m4af_write32(ctx, entry->fcc); | |
1235 | if (entry->fcc != M4AF_FOURCC('-','-','-','-')) | |
1236 | m4af_write_data_box(ctx, entry->type_code, | |
1237 | entry->data, entry->data_size); | |
1238 | else { | |
1239 | m4af_write_mean_box(ctx); | |
1240 | m4af_write_name_box(ctx, entry->name); | |
1241 | m4af_write_data_box(ctx, 1, entry->data, entry->data_size); | |
1242 | } | |
1243 | m4af_update_box_size(ctx, pos); | |
1244 | } | |
1245 | ||
1246 | static | |
1247 | void m4af_write_ilst_box(m4af_ctx_t *ctx) | |
1248 | { | |
1249 | uint32_t i; | |
1250 | int64_t pos = m4af_tell(ctx); | |
1251 | m4af_write(ctx, "\0\0\0\0ilst", 8); | |
1252 | for (i = 0; i < ctx->num_tags; ++i) | |
1253 | m4af_write_metadata(ctx, &ctx->itmf_table[i]); | |
1254 | m4af_update_box_size(ctx, pos); | |
1255 | } | |
1256 | ||
1257 | static | |
1258 | void m4af_write_meta_box(m4af_ctx_t *ctx) | |
1259 | { | |
1260 | int64_t pos = m4af_tell(ctx); | |
1261 | m4af_write(ctx, | |
1262 | "\0\0\0\0" /* size */ | |
1263 | "meta" /* type */ | |
1264 | "\0" /* version */ | |
1265 | "\0\0\0" /* flags */ | |
1266 | , 12); | |
1267 | m4af_write_hdlr_box(ctx, 0, "mdir"); | |
1268 | m4af_write_ilst_box(ctx); | |
1269 | m4af_update_box_size(ctx, pos); | |
1270 | } | |
1271 | ||
1272 | static | |
1273 | void m4af_write_udta_box(m4af_ctx_t *ctx) | |
1274 | { | |
1275 | int64_t pos = m4af_tell(ctx); | |
1276 | m4af_write(ctx, "\0\0\0\0udta", 8); | |
1277 | m4af_write_meta_box(ctx); | |
1278 | m4af_update_box_size(ctx, pos); | |
1279 | } | |
1280 | ||
1281 | static | |
1282 | uint32_t m4af_write_moov_box(m4af_ctx_t *ctx) | |
1283 | { | |
1284 | unsigned i; | |
1285 | int64_t pos = m4af_tell(ctx); | |
1286 | m4af_write(ctx, "\0\0\0\0moov", 8); | |
1287 | m4af_write_mvhd_box(ctx); | |
1288 | for (i = 0; i < ctx->num_tracks; ++i) | |
1289 | m4af_write_trak_box(ctx, i); | |
1290 | if (ctx->num_tags) | |
1291 | m4af_write_udta_box(ctx); | |
1292 | return m4af_update_box_size(ctx, pos); | |
1293 | } | |
1294 | ||
1295 | static | |
1296 | void m4af_finalize_mdat(m4af_ctx_t *ctx) | |
1297 | { | |
1298 | if (ctx->mdat_size + 8 > UINT32_MAX) { | |
1299 | m4af_set_pos(ctx, ctx->mdat_pos - 16); | |
1300 | m4af_write32(ctx, 1); | |
1301 | m4af_write(ctx, "mdat", 4); | |
1302 | m4af_write64(ctx, ctx->mdat_size + 16); | |
1303 | } else { | |
1304 | m4af_set_pos(ctx, ctx->mdat_pos - 8); | |
1305 | m4af_write32(ctx, ctx->mdat_size + 8); | |
1306 | } | |
1307 | m4af_set_pos(ctx, ctx->mdat_pos + ctx->mdat_size); | |
1308 | } | |
1309 | ||
1310 | static | |
1311 | void m4af_shift_mdat_pos(m4af_ctx_t *ctx, uint32_t offset) | |
1312 | { | |
1313 | unsigned i, j; | |
1314 | int64_t begin, end; | |
1315 | char buf[8192]; | |
1316 | ||
1317 | end = ctx->mdat_pos + ctx->mdat_size; | |
1318 | for (; (begin = m4af_max(ctx->mdat_pos, end - 8192)) < end; end = begin) { | |
1319 | m4af_set_pos(ctx, begin); | |
1320 | ctx->io.read(ctx->io_cookie, buf, end - begin); | |
1321 | m4af_set_pos(ctx, begin + offset); | |
1322 | m4af_write(ctx, buf, end - begin); | |
1323 | } | |
1324 | for (i = 0; i < ctx->num_tracks; ++i) | |
1325 | for (j = 0; j < ctx->track[i].num_chunks; ++j) | |
1326 | ctx->track[i].chunk_table[j].offset += offset; | |
1327 | ctx->mdat_pos += offset; | |
1328 | m4af_set_pos(ctx, ctx->mdat_pos - 16); | |
1329 | m4af_write_free_box(ctx, 0); | |
1330 | m4af_write(ctx, "\0\0\0\0mdat", 8); | |
1331 | m4af_finalize_mdat(ctx); | |
1332 | } | |
1333 | ||
1334 | int m4af_finalize(m4af_ctx_t *ctx, int optimize) | |
1335 | { | |
1336 | unsigned i; | |
1337 | m4af_track_t *track; | |
1338 | uint32_t moov_size; | |
1339 | ||
1340 | for (i = 0; i < ctx->num_tracks; ++i) { | |
1341 | track = ctx->track + i; | |
1342 | if (track->duration) { | |
1343 | int64_t track_size = 0; | |
1344 | unsigned j; | |
1345 | for (j = 0; j < track->num_chunks; ++j) | |
1346 | track_size += track->chunk_table[j].size; | |
1347 | track->avgBitrate = | |
1348 | 8.0 * track_size * track->timescale / track->duration + .5; | |
1349 | } | |
1350 | m4af_flush_chunk(ctx, i); | |
1351 | } | |
1352 | track = ctx->track; | |
1353 | if ((ctx->priming_mode & M4AF_PRIMING_MODE_ITUNSMPB) && | |
1354 | (track->encoder_delay || track->padding)) | |
1355 | m4af_set_iTunSMPB(ctx); | |
1356 | m4af_finalize_mdat(ctx); | |
1357 | moov_size = m4af_write_moov_box(ctx); | |
1358 | if (optimize) { | |
1359 | int64_t pos; | |
1360 | m4af_shift_mdat_pos(ctx, moov_size + 1024); | |
1361 | m4af_set_pos(ctx, 32); | |
1362 | m4af_write_moov_box(ctx); | |
1363 | pos = m4af_tell(ctx); | |
1364 | m4af_write_free_box(ctx, ctx->mdat_pos - pos - 24); | |
1365 | } | |
1366 | return ctx->last_error; | |
1367 | } |