48e2f01c |
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 <time.h> |
12 | #if HAVE_STDINT_H |
13 | # include <stdint.h> |
14 | #endif |
15 | #include "m4af.h" |
16 | #include "m4af_endian.h" |
17 | |
18 | #define m4af_realloc(memory,size) realloc(memory, size) |
19 | #define m4af_free(memory) free(memory) |
20 | |
21 | typedef struct m4af_sample_entry_t { |
22 | uint32_t size; |
23 | uint32_t delta; |
24 | } m4af_sample_entry_t; |
25 | |
26 | typedef struct m4af_chunk_entry_t { |
27 | int64_t offset; |
28 | uint32_t size; |
29 | uint32_t samples_per_chunk; |
30 | uint32_t duration; |
31 | } m4af_chunk_entry_t; |
32 | |
33 | typedef struct m4af_itmf_entry_t { |
34 | uint32_t type; /* fcc */ |
35 | union { |
36 | uint32_t type_code; |
37 | char *name; |
38 | } u; |
39 | char *data; |
40 | uint32_t data_size; |
41 | } m4af_itmf_entry_t; |
42 | |
43 | typedef struct m4af_track_t { |
44 | uint32_t codec; |
45 | uint32_t timescale; |
46 | int64_t creation_time; |
47 | int64_t modification_time; |
48 | int64_t duration; |
49 | uint32_t frame_duration; |
50 | uint32_t encoder_delay; |
51 | uint32_t padding; |
52 | uint8_t *decSpecificInfo; |
53 | uint32_t decSpecificInfoSize; |
54 | uint32_t bufferSizeDB; |
55 | uint32_t maxBitrate; |
56 | uint32_t avgBitrate; |
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 | } m4af_track_t; |
70 | |
71 | struct m4af_writer_t { |
72 | uint32_t timescale; |
73 | int64_t creation_time; |
74 | int64_t modification_time; |
75 | int64_t mdat_pos; |
76 | int64_t mdat_size; |
77 | int last_error; |
78 | |
79 | m4af_itmf_entry_t *itmf_table; |
80 | uint32_t num_tags; |
81 | uint32_t itmf_table_capacity; |
82 | |
83 | m4af_io_callbacks_t io; |
84 | void *io_cookie; |
85 | |
86 | uint16_t num_tracks; |
87 | m4af_track_t track[1]; |
88 | }; |
89 | |
90 | static |
91 | int64_t m4af_timestamp(void) |
92 | { |
93 | return (int64_t)(time(0)) + (((1970 - 1904) * 365) + 17) * 24 * 60 * 60; |
94 | } |
95 | |
96 | /* |
97 | * http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2 |
98 | */ |
99 | static |
100 | uint32_t m4af_roundup(uint32_t n) |
101 | { |
102 | n--; |
103 | n |= n >> 1; |
104 | n |= n >> 2; |
105 | n |= n >> 4; |
106 | n |= n >> 8; |
107 | n |= n >> 16; |
108 | n++; |
109 | return n; |
110 | } |
111 | |
112 | static |
113 | int64_t m4af_tell(m4af_writer_t *ctx) |
114 | { |
115 | int64_t pos = -1; |
116 | if (!ctx->last_error && (pos = ctx->io.tell(ctx->io_cookie)) < 0) |
117 | ctx->last_error = M4AF_IO_ERROR; |
118 | return pos; |
119 | } |
120 | |
121 | static |
122 | int m4af_set_pos(m4af_writer_t *ctx, int64_t pos) |
123 | { |
124 | int rc = -1; |
125 | if (!ctx->last_error && |
126 | (rc = ctx->io.seek(ctx->io_cookie, pos, SEEK_SET)) < 0) |
127 | ctx->last_error = M4AF_IO_ERROR; |
128 | return rc; |
129 | } |
130 | |
131 | static |
132 | int m4af_write(m4af_writer_t *ctx, const void *data, uint32_t size) |
133 | { |
134 | int rc = -1; |
135 | if (!ctx->last_error && |
136 | (rc = ctx->io.write(ctx->io_cookie, data, size)) < 0) |
137 | ctx->last_error = M4AF_IO_ERROR; |
138 | return rc; |
139 | } |
140 | |
141 | static |
142 | int m4af_write32(m4af_writer_t *ctx, uint32_t data) |
143 | { |
144 | data = m4af_htob32(data); |
145 | return m4af_write(ctx, &data, 4); |
146 | } |
147 | |
148 | static |
149 | int m4af_write64(m4af_writer_t *ctx, uint64_t data) |
150 | { |
151 | data = m4af_htob64(data); |
152 | return m4af_write(ctx, &data, 8); |
153 | } |
154 | |
155 | static |
156 | int m4af_write24(m4af_writer_t *ctx, uint32_t data) |
157 | { |
158 | data = m4af_htob32(data << 8); |
159 | return m4af_write(ctx, &data, 3); |
160 | } |
161 | |
162 | static |
163 | void m4af_write32_at(m4af_writer_t *ctx, int64_t pos, uint32_t value) |
164 | { |
165 | int64_t current_pos = m4af_tell(ctx); |
166 | m4af_set_pos(ctx, pos); |
167 | m4af_write32(ctx, value); |
168 | m4af_set_pos(ctx, current_pos); |
169 | } |
170 | |
171 | m4af_writer_t *m4af_create(uint32_t codec, uint32_t timescale, |
172 | m4af_io_callbacks_t *io, void *io_cookie) |
173 | { |
174 | m4af_writer_t *ctx; |
175 | int64_t timestamp; |
176 | |
177 | if (codec != M4AF_FOURCC('m','p','4','a') && |
178 | codec != M4AF_FOURCC('a','l','a','c')) |
179 | return 0; |
180 | if ((ctx = m4af_realloc(0, sizeof(m4af_writer_t))) == 0) |
181 | return 0; |
182 | memset(ctx, 0, sizeof(m4af_writer_t)); |
183 | memcpy(&ctx->io, io, sizeof(m4af_io_callbacks_t)); |
184 | ctx->io_cookie = io_cookie; |
185 | ctx->timescale = timescale; |
186 | timestamp = m4af_timestamp(); |
187 | ctx->creation_time = timestamp; |
188 | ctx->modification_time = timestamp; |
189 | ctx->num_tracks = 1; |
190 | ctx->track[0].codec = codec; |
191 | ctx->track[0].timescale = timescale; |
192 | ctx->track[0].creation_time = timestamp; |
193 | ctx->track[0].modification_time = timestamp; |
194 | return ctx; |
195 | } |
196 | |
197 | void m4af_set_fixed_frame_duration(m4af_writer_t *ctx, int track_idx, |
198 | uint32_t length) |
199 | { |
200 | ctx->track[track_idx].frame_duration = length; |
201 | } |
202 | |
203 | int m4af_decoder_specific_info(m4af_writer_t *ctx, int track_idx, |
204 | uint8_t *data, uint32_t size) |
205 | { |
206 | m4af_track_t *track = &ctx->track[track_idx]; |
207 | if (size > track->decSpecificInfoSize) { |
208 | uint8_t *memory = m4af_realloc(track->decSpecificInfo, size); |
209 | if (memory == 0) { |
210 | ctx->last_error = M4AF_NO_MEMORY; |
211 | return -1; |
212 | } |
213 | track->decSpecificInfo = memory; |
214 | } |
215 | if (size > 0) |
216 | memcpy(track->decSpecificInfo, data, size); |
217 | track->decSpecificInfoSize = size; |
218 | return 0; |
219 | } |
220 | |
221 | void m4af_set_priming(m4af_writer_t *ctx, int track_idx, |
222 | uint32_t encoder_delay, uint32_t padding) |
223 | { |
224 | m4af_track_t *track = &ctx->track[track_idx]; |
225 | track->encoder_delay = encoder_delay; |
226 | track->padding = padding; |
227 | } |
228 | |
229 | static |
230 | int m4af_add_sample_entry(m4af_writer_t *ctx, int track_idx, |
231 | uint32_t size, uint32_t delta) |
232 | { |
233 | m4af_track_t *track = &ctx->track[track_idx]; |
234 | m4af_sample_entry_t *entry; |
235 | |
236 | if (ctx->last_error) |
237 | return -1; |
238 | if (track->num_samples == track->sample_table_capacity) { |
239 | uint32_t new_size = track->sample_table_capacity; |
240 | new_size = new_size ? new_size * 2 : 1; |
241 | entry = m4af_realloc(track->sample_table, new_size * sizeof(*entry)); |
242 | if (entry == 0) { |
243 | ctx->last_error = M4AF_NO_MEMORY; |
244 | return -1; |
245 | } |
246 | track->sample_table = entry; |
247 | track->sample_table_capacity = new_size; |
248 | } |
249 | entry = track->sample_table + track->num_samples; |
250 | entry->size = size; |
251 | entry->delta = delta; |
252 | ++track->num_samples; |
253 | return 0; |
254 | } |
255 | |
256 | static |
257 | int m4af_flush_chunk(m4af_writer_t *ctx, int track_idx) |
258 | { |
259 | m4af_track_t *track = &ctx->track[track_idx]; |
260 | m4af_chunk_entry_t *entry; |
261 | if (!track->num_chunks || !track->chunk_size) |
262 | return 0; |
263 | entry = &track->chunk_table[track->num_chunks - 1]; |
264 | entry->offset = m4af_tell(ctx); |
265 | m4af_write(ctx, track->chunk_buffer, track->chunk_size); |
266 | ctx->mdat_size += track->chunk_size; |
267 | track->chunk_size = 0; |
268 | return ctx->last_error ? -1 : 0; |
269 | } |
270 | |
271 | static |
272 | int m4af_update_chunk_table(m4af_writer_t *ctx, int track_idx, |
273 | uint32_t size, uint32_t delta) |
274 | { |
275 | m4af_track_t *track = &ctx->track[track_idx]; |
276 | m4af_chunk_entry_t *entry; |
277 | int add_new_chunk = 0; |
278 | |
279 | if (ctx->last_error) |
280 | return -1; |
281 | if (track->num_chunks == 0) |
282 | add_new_chunk = 1; |
283 | else { |
284 | entry = &track->chunk_table[track->num_chunks - 1]; |
285 | if (entry->duration + delta > track->timescale / 2) |
286 | add_new_chunk = 1; |
287 | } |
288 | if (add_new_chunk) { |
289 | m4af_flush_chunk(ctx, track_idx); |
290 | if (track->num_chunks == track->chunk_table_capacity) { |
291 | uint32_t new_size = track->chunk_table_capacity; |
292 | new_size = new_size ? new_size * 2 : 1; |
293 | entry = m4af_realloc(track->chunk_table, new_size * sizeof(*entry)); |
294 | if (entry == 0) { |
295 | ctx->last_error = M4AF_NO_MEMORY; |
296 | return -1; |
297 | } |
298 | track->chunk_table = entry; |
299 | track->chunk_table_capacity = new_size; |
300 | } |
301 | memset(&track->chunk_table[track->num_chunks++], 0, |
302 | sizeof(m4af_chunk_entry_t)); |
303 | } |
304 | entry = &track->chunk_table[track->num_chunks - 1]; |
305 | entry->size += size; |
306 | ++entry->samples_per_chunk; |
307 | entry->duration += delta; |
308 | return 0; |
309 | } |
310 | |
311 | static |
312 | void m4af_update_max_bitrate(m4af_writer_t *ctx, int track_idx) |
313 | { |
314 | m4af_track_t *track = &ctx->track[track_idx]; |
315 | uint32_t duration = 0, size = 0, bitrate; |
316 | m4af_sample_entry_t *ent = track->sample_table + track->num_samples - 1; |
317 | |
318 | for (; ent >= track->sample_table && duration < track->timescale; --ent) { |
319 | duration += ent->delta; |
320 | size += ent->size; |
321 | } |
322 | bitrate = (uint32_t)(size * 8.0 * track->timescale / duration + .5); |
323 | if (bitrate > track->maxBitrate) |
324 | track->maxBitrate = bitrate; |
325 | } |
326 | |
327 | static |
328 | int m4af_append_sample_to_chunk(m4af_writer_t *ctx, int track_idx, |
329 | const void *data, uint32_t size) |
330 | { |
331 | m4af_track_t *track = &ctx->track[track_idx]; |
332 | uint32_t newsize = track->chunk_size + size; |
333 | |
334 | if (ctx->last_error) |
335 | return -1; |
336 | if (track->chunk_capacity < newsize) { |
337 | uint32_t capacity = m4af_roundup(newsize); |
338 | uint8_t *memory = realloc(track->chunk_buffer, capacity); |
339 | if (!memory) { |
340 | ctx->last_error = M4AF_NO_MEMORY; |
341 | return -1; |
342 | } |
343 | track->chunk_buffer = memory; |
344 | track->chunk_capacity = capacity; |
345 | } |
346 | memcpy(track->chunk_buffer + track->chunk_size, data, size); |
347 | track->chunk_size = newsize; |
348 | return 0; |
349 | } |
350 | |
351 | int m4af_write_sample(m4af_writer_t *ctx, int track_idx, const void *data, |
352 | uint32_t size, uint32_t duration) |
353 | { |
354 | m4af_track_t *track = &ctx->track[track_idx]; |
355 | if (track->frame_duration) |
356 | duration = track->frame_duration; |
357 | if (size > track->bufferSizeDB) |
358 | track->bufferSizeDB = size; |
359 | track->duration += duration; |
360 | m4af_add_sample_entry(ctx, track_idx, size, duration); |
361 | m4af_update_chunk_table(ctx, track_idx, size, duration); |
362 | m4af_update_max_bitrate(ctx, track_idx); |
363 | m4af_append_sample_to_chunk(ctx, track_idx, data, size); |
364 | return ctx->last_error ? -1 : 0; |
365 | } |
366 | |
367 | static |
368 | int m4af_add_itmf_entry(m4af_writer_t *ctx) |
369 | { |
370 | m4af_itmf_entry_t *entry; |
371 | if (ctx->num_tags == ctx->itmf_table_capacity) { |
372 | uint32_t new_size = ctx->itmf_table_capacity; |
373 | new_size = new_size ? new_size * 2 : 1; |
374 | entry = m4af_realloc(ctx->itmf_table, new_size * sizeof(*entry)); |
375 | if (entry == 0) { |
376 | ctx->last_error = M4AF_NO_MEMORY; |
377 | return -1; |
378 | } |
379 | ctx->itmf_table = entry; |
380 | ctx->itmf_table_capacity = new_size; |
381 | } |
382 | ++ctx->num_tags; |
383 | return 0; |
384 | } |
385 | |
386 | int m4af_add_itmf_long_tag(m4af_writer_t *ctx, const char *name, |
387 | const char *data) |
388 | { |
389 | m4af_itmf_entry_t *entry; |
390 | size_t name_len = strlen(name); |
391 | size_t data_len = strlen(data); |
392 | char *name_copy = m4af_realloc(0, name_len + 1); |
393 | char *data_copy = m4af_realloc(0, data_len); |
394 | if (!name_copy || !data_copy) { |
395 | ctx->last_error = M4AF_NO_MEMORY; |
396 | goto FAIL; |
397 | } |
398 | if (m4af_add_itmf_entry(ctx) < 0) |
399 | goto FAIL; |
400 | memcpy(name_copy, name, name_len + 1); |
401 | memcpy(data_copy, data, data_len); |
402 | entry = ctx->itmf_table + ctx->num_tags - 1; |
403 | entry->type = M4AF_FOURCC('-','-','-','-'); |
404 | entry->u.name = name_copy; |
405 | entry->data = data_copy; |
406 | entry->data_size = data_len; |
407 | return 0; |
408 | FAIL: |
409 | if (name_copy) |
410 | m4af_free(name_copy); |
411 | if (data_copy) |
412 | m4af_free(data_copy); |
413 | return -1; |
414 | } |
415 | |
416 | int m4af_add_itmf_short_tag(m4af_writer_t *ctx, uint32_t type, |
417 | uint32_t type_code, const void *data, |
418 | uint32_t data_size) |
419 | { |
420 | m4af_itmf_entry_t *entry; |
421 | char *data_copy = m4af_realloc(0, data_size); |
422 | if (!data_copy) { |
423 | ctx->last_error = M4AF_NO_MEMORY; |
424 | goto FAIL; |
425 | } |
426 | if (m4af_add_itmf_entry(ctx) < 0) |
427 | goto FAIL; |
428 | entry = ctx->itmf_table + ctx->num_tags - 1; |
429 | entry->type = type; |
430 | entry->u.type_code = type_code; |
431 | memcpy(data_copy, data, data_size); |
432 | entry->data = data_copy; |
433 | entry->data_size = data_size; |
434 | return 0; |
435 | FAIL: |
436 | if (data_copy) |
437 | m4af_free(data_copy); |
438 | return -1; |
439 | } |
440 | |
441 | int m4af_add_itmf_string_tag(m4af_writer_t *ctx, uint32_t type, |
442 | const char *data) |
443 | { |
444 | return m4af_add_itmf_short_tag(ctx, type, M4AF_UTF8, data, strlen(data)); |
445 | } |
446 | |
447 | int m4af_add_itmf_int8_tag(m4af_writer_t *ctx, uint32_t type, int value) |
448 | { |
449 | uint8_t data = value; |
450 | return m4af_add_itmf_short_tag(ctx, type, M4AF_INTEGER, &data, 1); |
451 | } |
452 | |
453 | int m4af_add_itmf_int16_tag(m4af_writer_t *ctx, uint32_t type, int value) |
454 | { |
455 | uint16_t data = m4af_htob16(value); |
456 | return m4af_add_itmf_short_tag(ctx, type, M4AF_INTEGER, &data, 2); |
457 | } |
458 | |
c5c45908 |
459 | int m4af_add_itmf_int32_tag(m4af_writer_t *ctx, uint32_t type, uint32_t value) |
48e2f01c |
460 | { |
461 | uint32_t data = m4af_htob32(value); |
462 | return m4af_add_itmf_short_tag(ctx, type, M4AF_INTEGER, &data, 4); |
463 | } |
464 | |
c5c45908 |
465 | int m4af_add_itmf_int64_tag(m4af_writer_t *ctx, uint32_t type, uint64_t value) |
466 | { |
467 | uint64_t data = m4af_htob64(value); |
468 | return m4af_add_itmf_short_tag(ctx, type, M4AF_INTEGER, &data, 8); |
469 | } |
470 | |
48e2f01c |
471 | int m4af_add_itmf_track_tag(m4af_writer_t *ctx, int track, int total) |
472 | { |
473 | uint16_t data[4] = { 0 }; |
474 | data[1] = m4af_htob16(track); |
475 | data[2] = m4af_htob16(total); |
476 | return m4af_add_itmf_short_tag(ctx, M4AF_FOURCC('t','r','k','n'), |
477 | M4AF_IMPLICIT, &data, 8); |
478 | } |
479 | |
480 | int m4af_add_itmf_disk_tag(m4af_writer_t *ctx, int disk, int total) |
481 | { |
482 | uint16_t data[3] = { 0 }; |
483 | data[1] = m4af_htob16(disk); |
484 | data[2] = m4af_htob16(total); |
485 | return m4af_add_itmf_short_tag(ctx, M4AF_FOURCC('d','i','s','k'), |
486 | M4AF_IMPLICIT, &data, 6); |
487 | } |
488 | |
489 | int m4af_add_itmf_genre_tag(m4af_writer_t *ctx, int genre) |
490 | { |
491 | uint16_t data = m4af_htob16(genre); |
492 | return m4af_add_itmf_short_tag(ctx, M4AF_FOURCC('g','n','r','e'), |
493 | M4AF_IMPLICIT, &data, 2); |
494 | } |
495 | |
496 | static |
497 | int m4af_set_iTunSMPB(m4af_writer_t *ctx) |
498 | { |
499 | const char *template = " 00000000 %08X %08X %08X%08X 00000000 00000000 " |
500 | "00000000 00000000 00000000 00000000 00000000 00000000"; |
501 | m4af_track_t *track = &ctx->track[0]; |
502 | char buf[256]; |
503 | uint64_t length = track->duration - track->encoder_delay - track->padding; |
504 | sprintf(buf, template, track->encoder_delay, track->padding, |
505 | (uint32_t)(length >> 32), (uint32_t)length); |
506 | return m4af_add_itmf_long_tag(ctx, "iTunSMPB", buf); |
507 | } |
508 | |
509 | static |
510 | void m4af_update_size(m4af_writer_t *ctx, int64_t pos) |
511 | { |
512 | int64_t current_pos = m4af_tell(ctx); |
513 | m4af_set_pos(ctx, pos); |
514 | m4af_write32(ctx, current_pos - pos); |
515 | m4af_set_pos(ctx, current_pos); |
516 | } |
517 | |
518 | static |
519 | int m4af_head_version(m4af_writer_t *ctx, int track_idx) |
520 | { |
521 | m4af_track_t *track = &ctx->track[track_idx]; |
522 | return track->duration > UINT32_MAX |
523 | || track->creation_time > UINT32_MAX |
524 | || track->modification_time > UINT32_MAX; |
525 | } |
526 | |
527 | static |
528 | void m4af_descriptor(m4af_writer_t *ctx, uint32_t tag, uint32_t size) |
529 | { |
530 | uint8_t buf[5]; |
531 | buf[0] = tag; |
532 | buf[1] = ((size >> 21) | 0x80); |
533 | buf[2] = ((size >> 14) | 0x80); |
534 | buf[3] = ((size >> 7) | 0x80); |
535 | buf[4] = (size & 0x7f); |
536 | m4af_write(ctx, buf, 5); |
537 | } |
538 | |
539 | static |
540 | void m4af_ftyp_box(m4af_writer_t *ctx) |
541 | { |
542 | m4af_write(ctx, "\0\0\0\040""ftypM4A \0\0\0\0M4A mp42isom\0\0\0\0", 32); |
543 | } |
544 | |
545 | static |
546 | void m4af_free_box(m4af_writer_t *ctx, uint32_t size) |
547 | { |
548 | int64_t pos = m4af_tell(ctx); |
549 | m4af_write32(ctx, size + 8); |
550 | m4af_write(ctx, "free", 4); |
551 | if (size > 0) |
552 | m4af_set_pos(ctx, pos + size + 8); |
553 | } |
554 | |
555 | int m4af_begin_write(m4af_writer_t *ctx) |
556 | { |
557 | m4af_ftyp_box(ctx); |
558 | m4af_free_box(ctx, 0); |
559 | m4af_write(ctx, "\0\0\0\0mdat", 8); |
560 | ctx->mdat_pos = m4af_tell(ctx); |
561 | return ctx->last_error ? -1 : 0; |
562 | } |
563 | |
564 | static |
565 | void m4af_stco_box(m4af_writer_t *ctx, int track_idx) |
566 | { |
567 | m4af_track_t *track = &ctx->track[track_idx]; |
568 | uint32_t i; |
569 | m4af_chunk_entry_t *index = track->chunk_table; |
570 | int is_co64 = (ctx->mdat_pos + ctx->mdat_size > UINT32_MAX); |
571 | int64_t pos = m4af_tell(ctx); |
572 | |
573 | m4af_write32(ctx, 0); /* size */ |
574 | m4af_write(ctx, is_co64 ? "co64" : "stco", 4); |
575 | m4af_write32(ctx, 0); /* version and flags */ |
576 | m4af_write32(ctx, track->num_chunks); |
577 | for (i = 0; i < track->num_chunks; ++i, ++index) { |
578 | if (is_co64) |
579 | m4af_write64(ctx, index->offset); |
580 | else |
581 | m4af_write32(ctx, index->offset); |
582 | } |
583 | m4af_update_size(ctx, pos); |
584 | } |
585 | |
586 | static |
587 | void m4af_stsz_box(m4af_writer_t *ctx, int track_idx) |
588 | { |
589 | m4af_track_t *track = &ctx->track[track_idx]; |
590 | m4af_sample_entry_t *index = track->sample_table; |
591 | uint32_t i; |
592 | int64_t pos = m4af_tell(ctx); |
593 | m4af_write(ctx, |
594 | "\0\0\0\0" /* size */ |
595 | "stsz" /* type */ |
596 | "\0" /* version */ |
597 | "\0\0\0" /* flags */ |
598 | "\0\0\0\0" /* sample_size: 0(variable) */ |
599 | , 16); |
600 | m4af_write32(ctx, track->num_samples); |
601 | for (i = 0; i < track->num_samples; ++i, ++index) |
602 | m4af_write32(ctx, index->size); |
603 | m4af_update_size(ctx, pos); |
604 | } |
605 | |
606 | static |
607 | void m4af_stsc_box(m4af_writer_t *ctx, int track_idx) |
608 | { |
609 | m4af_track_t *track = &ctx->track[track_idx]; |
610 | m4af_chunk_entry_t *index = track->chunk_table; |
611 | uint32_t i, prev_samples_per_chunk = 0, entry_count = 0; |
612 | int64_t pos = m4af_tell(ctx); |
613 | m4af_write(ctx, |
614 | "\0\0\0\0" /* size */ |
615 | "stsc" /* type */ |
616 | "\0" /* version */ |
617 | "\0\0\0" /* flags */ |
618 | "\0\0\0\0" /* entry_count */ |
619 | , 16); |
620 | |
621 | for (i = 0; i < track->num_chunks; ++i, ++index) { |
622 | if (index->samples_per_chunk != prev_samples_per_chunk) { |
623 | ++entry_count; |
624 | m4af_write32(ctx, i + 1); |
625 | m4af_write32(ctx, index->samples_per_chunk); |
626 | m4af_write32(ctx, 1); /* sample_description_index */ |
627 | prev_samples_per_chunk = index->samples_per_chunk; |
628 | } |
629 | } |
630 | m4af_write32_at(ctx, pos + 12, entry_count); |
631 | m4af_update_size(ctx, pos); |
632 | } |
633 | |
634 | static |
635 | void m4af_stts_box(m4af_writer_t *ctx, int track_idx) |
636 | { |
637 | m4af_track_t *track = &ctx->track[track_idx]; |
638 | m4af_sample_entry_t *index = track->sample_table; |
639 | uint32_t i, prev_delta = 0, entry_count = 0, sample_count = 0; |
640 | int64_t pos = m4af_tell(ctx); |
641 | m4af_write(ctx, |
642 | "\0\0\0\0" /* size */ |
643 | "stts" /* type */ |
644 | "\0" /* version */ |
645 | "\0\0\0" /* flags */ |
646 | "\0\0\0\0" /* entry_count */ |
647 | , 16); |
648 | |
649 | for (i = 0; i < track->num_samples; ++i, ++index) { |
650 | if (index->delta == prev_delta) |
651 | ++sample_count; |
652 | else { |
653 | ++entry_count; |
654 | if (sample_count) { |
655 | m4af_write32(ctx, sample_count); |
656 | m4af_write32(ctx, prev_delta); |
657 | } |
658 | prev_delta = index->delta; |
659 | sample_count = 1; |
660 | } |
661 | } |
662 | if (sample_count) { |
663 | m4af_write32(ctx, sample_count); |
664 | m4af_write32(ctx, prev_delta); |
665 | } |
666 | m4af_write32_at(ctx, pos + 12, entry_count); |
667 | m4af_update_size(ctx, pos); |
668 | } |
669 | |
670 | static |
671 | void m4af_esds_box(m4af_writer_t *ctx, int track_idx) |
672 | { |
673 | m4af_track_t *track = &ctx->track[track_idx]; |
674 | int64_t pos = m4af_tell(ctx); |
675 | m4af_write(ctx, "\0\0\0\0esds", 8); |
676 | m4af_write32(ctx, 0); /* version + flags */ |
677 | |
678 | /* ES_Descriptor */ |
679 | m4af_descriptor(ctx, 3, 32 + track->decSpecificInfoSize); |
680 | m4af_write(ctx, "\0\0\0", 3); |
681 | /* DecoderConfigDescriptor */ |
682 | m4af_descriptor(ctx, 4, 18 + track->decSpecificInfoSize); |
683 | m4af_write(ctx, |
684 | "\x40" /* objectTypeIndication: 0x40(Audio ISO/IEC 14496-3)*/ |
685 | "\x15" /* streamType(6): 0x05(AudioStream) |
686 | * upStream(1) : 0 |
687 | * reserved(1) : 1 |
688 | */ |
689 | , 2); |
690 | m4af_write24(ctx, track->bufferSizeDB); |
691 | m4af_write32(ctx, track->maxBitrate); |
692 | m4af_write32(ctx, track->avgBitrate); |
693 | /* DecoderSpecificInfo */ |
694 | m4af_descriptor(ctx, 5, track->decSpecificInfoSize); |
695 | m4af_write(ctx, track->decSpecificInfo, track->decSpecificInfoSize); |
696 | /* SLConfigDescriptor */ |
697 | m4af_descriptor(ctx, 6, 1); |
698 | m4af_write(ctx, "\002", 1); /* predefined */ |
699 | |
700 | m4af_update_size(ctx, pos); |
701 | } |
702 | |
703 | static |
704 | void m4af_alac_box(m4af_writer_t *ctx, int track_idx) |
705 | { |
706 | m4af_track_t *track = &ctx->track[track_idx]; |
707 | int64_t pos = m4af_tell(ctx); |
708 | m4af_write(ctx, |
709 | "\0\0\0\0" /* size */ |
710 | "alac" /* type */ |
711 | "\0" /* version */ |
712 | "\0\0\0" /* flags */ |
713 | , 12); |
714 | m4af_write(ctx, track->decSpecificInfo, track->decSpecificInfoSize); |
715 | m4af_update_size(ctx, pos); |
716 | } |
717 | |
718 | static |
719 | void m4af_mp4a_box(m4af_writer_t *ctx, int track_idx) |
720 | { |
721 | m4af_track_t *track = &ctx->track[track_idx]; |
722 | int64_t pos = m4af_tell(ctx); |
723 | m4af_write32(ctx, 0); /* size */ |
724 | m4af_write32(ctx, track->codec); /* mp4a or alac */ |
725 | m4af_write(ctx, |
726 | "\0\0\0\0\0\0" /* reserved */ |
727 | "\0\001" /* data_reference_index: 1 */ |
728 | "\0\0\0\0" /* reserved[0] */ |
729 | "\0\0\0\0" /* reserved[1] */ |
730 | "\0\002" /* channelcount: 2 */ |
731 | "\0\020" /* samplesize: 16 */ |
732 | "\0\0" /* pre_defined */ |
733 | "\0\0" /* reserved */ |
734 | ,24); |
735 | if (track->codec == M4AF_FOURCC('m','p','4','a')) { |
736 | m4af_write32(ctx, track->timescale << 16); |
737 | m4af_esds_box(ctx, track_idx); |
738 | } else { |
739 | m4af_write32(ctx, 44100); |
740 | m4af_alac_box(ctx, track_idx); |
741 | } |
742 | m4af_update_size(ctx, pos); |
743 | } |
744 | |
745 | static |
746 | void m4af_stsd_box(m4af_writer_t *ctx, int track_idx) |
747 | { |
748 | int64_t pos = m4af_tell(ctx); |
749 | m4af_write(ctx, "\0\0\0\0stsd", 8); |
750 | m4af_write(ctx, |
751 | "\0" /* version */ |
752 | "\0\0\0" /* flags */ |
753 | "\0\0\0\001" /* entry_count: 1 */ |
754 | , 8); |
755 | m4af_mp4a_box(ctx, track_idx); |
756 | m4af_update_size(ctx, pos); |
757 | } |
758 | |
759 | static |
760 | void m4af_stbl_box(m4af_writer_t *ctx, int track_idx) |
761 | { |
762 | int64_t pos = m4af_tell(ctx); |
763 | m4af_write(ctx, "\0\0\0\0stbl", 8); |
764 | m4af_stsd_box(ctx, track_idx); |
765 | m4af_stts_box(ctx, track_idx); |
766 | m4af_stsc_box(ctx, track_idx); |
767 | m4af_stsz_box(ctx, track_idx); |
768 | m4af_stco_box(ctx, track_idx); |
769 | m4af_update_size(ctx, pos); |
770 | } |
771 | |
772 | static |
773 | void m4af_url_box(m4af_writer_t *ctx, int track_idx) |
774 | { |
775 | m4af_write(ctx, |
776 | "\0\0\0\014" /* size */ |
777 | "url " /* type */ |
778 | "\0" /* version */ |
779 | "\0\0\001" /* flags: 1(in the same file) */ |
780 | , 12); |
781 | } |
782 | |
783 | static |
784 | void m4af_dref_box(m4af_writer_t *ctx, int track_idx) |
785 | { |
786 | int64_t pos = m4af_tell(ctx); |
787 | m4af_write(ctx, "\0\0\0\0dref", 8); |
788 | m4af_write(ctx, |
789 | "\0" /* version */ |
790 | "\0\0\0" /* flags */ |
791 | "\0\0\0\001" /* entry_count: 1 */ |
792 | ,8); |
793 | m4af_url_box(ctx, track_idx); |
794 | m4af_update_size(ctx, pos); |
795 | } |
796 | |
797 | static |
798 | void m4af_dinf_box(m4af_writer_t *ctx, int track_idx) |
799 | { |
800 | int64_t pos = m4af_tell(ctx); |
801 | m4af_write(ctx, "\0\0\0\0dinf", 8); |
802 | m4af_dref_box(ctx, track_idx); |
803 | m4af_update_size(ctx, pos); |
804 | } |
805 | |
806 | static |
807 | void m4af_smhd_box(m4af_writer_t *ctx, int track_idx) |
808 | { |
809 | m4af_write(ctx, |
810 | "\0\0\0\020" /* size */ |
811 | "smhd" /* type */ |
812 | "\0" /* version */ |
813 | "\0\0\0" /* flags */ |
814 | "\0\0" /* balance */ |
815 | "\0\0" /* reserved */ |
816 | , 16); |
817 | } |
818 | |
819 | static |
820 | void m4af_minf_box(m4af_writer_t *ctx, int track_idx) |
821 | { |
822 | m4af_track_t *track = &ctx->track[track_idx]; |
823 | int64_t pos = m4af_tell(ctx); |
824 | m4af_write(ctx, "\0\0\0\0minf", 8); |
825 | /* TODO: add TEXT support */ |
826 | if (track->codec != M4AF_CODEC_TEXT) |
827 | m4af_smhd_box(ctx, track_idx); |
828 | m4af_dinf_box(ctx, track_idx); |
829 | m4af_stbl_box(ctx, track_idx); |
830 | m4af_update_size(ctx, pos); |
831 | } |
832 | |
833 | static |
834 | void m4af_mdhd_box(m4af_writer_t *ctx, int track_idx) |
835 | { |
836 | m4af_track_t *track = &ctx->track[track_idx]; |
837 | int64_t pos = m4af_tell(ctx); |
838 | uint8_t version = m4af_head_version(ctx, track_idx); |
839 | |
840 | m4af_write(ctx, "\0\0\0\0mdhd", 8); |
841 | m4af_write(ctx, &version, 1); |
842 | m4af_write(ctx, "\0\0\0", 3); /* flags */ |
843 | if (version) { |
844 | m4af_write64(ctx, track->creation_time); |
845 | m4af_write64(ctx, track->modification_time); |
846 | m4af_write32(ctx, track->timescale); |
847 | m4af_write64(ctx, track->duration); |
848 | } else { |
849 | m4af_write32(ctx, track->creation_time); |
850 | m4af_write32(ctx, track->modification_time); |
851 | m4af_write32(ctx, track->timescale); |
852 | m4af_write32(ctx, track->duration); |
853 | } |
854 | m4af_write(ctx, |
855 | "\x55\xc4" /* language: und */ |
856 | "\0\0" /* pre_defined */ |
857 | , 4); |
858 | m4af_update_size(ctx, pos); |
859 | } |
860 | |
861 | static |
862 | void m4af_hdlr_box(m4af_writer_t *ctx, int track_idx, const char *type) |
863 | { |
864 | int64_t pos = m4af_tell(ctx); |
865 | static const char reserved_and_name[10] = { 0 }; |
866 | |
867 | m4af_write(ctx, |
868 | "\0\0\0\0" /* size */ |
869 | "hdlr" /* type */ |
870 | "\0" /* version */ |
871 | "\0\0\0" /* flags */ |
872 | "\0\0\0\0" /* pre_defined */ |
873 | , 16); |
874 | m4af_write(ctx, type, 4); /* handler_type */ |
875 | /* reserved[0] */ |
876 | m4af_write(ctx, !strcmp(type, "mdir") ? "appl" : "\0\0\0\0", 4); |
877 | /* reserved[1], reserved[2], name */ |
878 | m4af_write(ctx, reserved_and_name, (pos & 1) ? 9 : 10); |
879 | m4af_update_size(ctx, pos); |
880 | } |
881 | |
882 | static |
883 | void m4af_mdia_box(m4af_writer_t *ctx, int track_idx) |
884 | { |
885 | m4af_track_t *track = &ctx->track[track_idx]; |
886 | const char *hdlr = |
887 | (track->codec == M4AF_CODEC_TEXT) ? "text" : "soun"; |
888 | int64_t pos = m4af_tell(ctx); |
889 | m4af_write(ctx, "\0\0\0\0mdia", 8); |
890 | m4af_mdhd_box(ctx, track_idx); |
891 | m4af_hdlr_box(ctx, track_idx, hdlr); |
892 | m4af_minf_box(ctx, track_idx); |
893 | m4af_update_size(ctx, pos); |
894 | } |
895 | |
896 | static |
897 | void m4af_tkhd_box(m4af_writer_t *ctx, int track_idx) |
898 | { |
899 | m4af_track_t *track = &ctx->track[track_idx]; |
900 | int64_t pos = m4af_tell(ctx); |
901 | uint8_t version = m4af_head_version(ctx, track_idx); |
902 | m4af_write(ctx, "\0\0\0\0tkhd", 8); |
903 | m4af_write(ctx, &version, 1); |
904 | m4af_write(ctx, "\0\0\007", 3); /* flags */ |
905 | if (version) { |
906 | m4af_write64(ctx, track->creation_time); |
907 | m4af_write64(ctx, track->modification_time); |
908 | m4af_write32(ctx, track_idx + 1); |
909 | m4af_write(ctx, "\0\0\0\0" /* reserved */ |
910 | , 4); |
911 | m4af_write64(ctx, track->duration); |
912 | } else { |
913 | m4af_write32(ctx, track->creation_time); |
914 | m4af_write32(ctx, track->modification_time); |
915 | m4af_write32(ctx, track_idx + 1); |
916 | m4af_write(ctx, "\0\0\0\0" /* reserved */ |
917 | , 4); |
918 | m4af_write32(ctx, track->duration); |
919 | } |
920 | m4af_write(ctx, |
921 | "\0\0\0\0" /* reserved[0] */ |
922 | "\0\0\0\0" /* reserved[1] */ |
923 | "\0\0" /* layer */ |
924 | "\0\0" /* alternate_group */ |
925 | "\001\0" /* volume: 1.0 */ |
926 | "\0\0" /* reserved */ |
927 | "\0\001\0\0" /* matrix[0] */ |
928 | "\0\0\0\0" /* matrix[1] */ |
929 | "\0\0\0\0" /* matrix[2] */ |
930 | "\0\0\0\0" /* matrix[3] */ |
931 | "\0\001\0\0" /* matrix[4] */ |
932 | "\0\0\0\0" /* matrix[5] */ |
933 | "\0\0\0\0" /* matrix[6] */ |
934 | "\0\0\0\0" /* matrix[7] */ |
935 | "\100\0\0\0" /* matrix[8] */ |
936 | "\0\0\0\0" /* width */ |
937 | "\0\0\0\0" /* height */ |
938 | , 60); |
939 | m4af_update_size(ctx, pos); |
940 | } |
941 | |
942 | static |
943 | void m4af_trak_box(m4af_writer_t *ctx, int track_idx) |
944 | { |
945 | int64_t pos = m4af_tell(ctx); |
946 | m4af_write(ctx, "\0\0\0\0trak", 8); |
947 | m4af_tkhd_box(ctx, track_idx); |
948 | m4af_mdia_box(ctx, track_idx); |
949 | m4af_update_size(ctx, pos); |
950 | } |
951 | |
952 | static |
953 | int64_t m4af_movie_duration(m4af_writer_t *ctx) |
954 | { |
955 | int64_t movie_duration = 0; |
956 | unsigned i; |
957 | for (i = 0; i < ctx->num_tracks; ++i) { |
958 | double x = ctx->track[i].duration; |
959 | int64_t duration = x * ctx->track[i].timescale / ctx->timescale + .5; |
960 | if (duration > movie_duration) |
961 | movie_duration = duration; |
962 | } |
963 | return movie_duration; |
964 | } |
965 | |
966 | static |
967 | void m4af_mvhd_box(m4af_writer_t *ctx) |
968 | { |
969 | int64_t pos = m4af_tell(ctx); |
970 | uint8_t version = m4af_head_version(ctx, 0); |
971 | int64_t movie_duration = m4af_movie_duration(ctx); |
972 | |
973 | m4af_write(ctx, "\0\0\0\0mvhd", 8); |
974 | m4af_write(ctx, &version, 1); |
975 | m4af_write(ctx, "\0\0\0", 3); /* flags */ |
976 | if (version) { |
977 | m4af_write64(ctx, ctx->creation_time); |
978 | m4af_write64(ctx, ctx->modification_time); |
979 | m4af_write32(ctx, ctx->timescale); |
980 | m4af_write64(ctx, movie_duration); |
981 | } else { |
982 | m4af_write32(ctx, ctx->creation_time); |
983 | m4af_write32(ctx, ctx->modification_time); |
984 | m4af_write32(ctx, ctx->timescale); |
985 | m4af_write32(ctx, movie_duration); |
986 | } |
987 | m4af_write(ctx, |
988 | "\0\001\0\0" /* rate: 1.0 */ |
989 | "\001\0" /* volume: 1.0 */ |
990 | "\0\0" /* reserved */ |
991 | "\0\0\0\0" /* reserved[0] */ |
992 | "\0\0\0\0" /* reserved[1] */ |
993 | "\0\001\0\0" /* matrix[0] */ |
994 | "\0\0\0\0" /* matrix[1] */ |
995 | "\0\0\0\0" /* matrix[2] */ |
996 | "\0\0\0\0" /* matrix[3] */ |
997 | "\0\001\0\0" /* matrix[4] */ |
998 | "\0\0\0\0" /* matrix[5] */ |
999 | "\0\0\0\0" /* matrix[6] */ |
1000 | "\0\0\0\0" /* matrix[7] */ |
1001 | "\100\0\0\0" /* matrix[8] */ |
1002 | "\0\0\0\0" /* pre_defined[0] */ |
1003 | "\0\0\0\0" /* pre_defined[1] */ |
1004 | "\0\0\0\0" /* pre_defined[2] */ |
1005 | "\0\0\0\0" /* pre_defined[3] */ |
1006 | "\0\0\0\0" /* pre_defined[4] */ |
1007 | "\0\0\0\0" /* pre_defined[5] */ |
1008 | , 76); |
1009 | m4af_write32(ctx, ctx->num_tracks + 1); |
1010 | m4af_update_size(ctx, pos); |
1011 | } |
1012 | |
1013 | static |
1014 | void m4af_mean_box(m4af_writer_t *ctx) |
1015 | { |
1016 | m4af_write(ctx, |
1017 | "\0\0\0\034" /* size */ |
1018 | "mean" |
1019 | "\0" /* version */ |
1020 | "\0\0\0" /* flags */ |
1021 | "com.apple.iTunes" /* meaning-string */ |
1022 | , 28); |
1023 | } |
1024 | |
1025 | static |
1026 | void m4af_name_box(m4af_writer_t *ctx, const char *name) |
1027 | { |
1028 | int64_t pos = m4af_tell(ctx); |
1029 | m4af_write(ctx, |
1030 | "\0\0\0\0" /* size */ |
1031 | "name" /* type */ |
1032 | "\0" /* version */ |
1033 | "\0\0\0" /* flags */ |
1034 | , 12); |
1035 | m4af_write(ctx, name, strlen(name)); |
1036 | m4af_update_size(ctx, pos); |
1037 | } |
1038 | |
1039 | static |
1040 | void m4af_data_box(m4af_writer_t *ctx, uint32_t type_code, |
1041 | const char *data, uint32_t data_size) |
1042 | { |
1043 | int64_t pos = m4af_tell(ctx); |
1044 | uint8_t code = type_code; |
1045 | m4af_write(ctx, |
1046 | "\0\0\0\0" /* size */ |
1047 | "data" /* type */ |
1048 | "\0\0" /* reserved */ |
1049 | "\0" /* type_set_indifier */ |
1050 | ,11); |
1051 | m4af_write(ctx, &code, 1); |
1052 | m4af_write(ctx, "\0\0\0\0", 4); /* locale */ |
1053 | m4af_write(ctx, data, data_size); |
1054 | m4af_update_size(ctx, pos); |
1055 | } |
1056 | |
1057 | static |
1058 | void m4af_write_metadata(m4af_writer_t *ctx, m4af_itmf_entry_t *entry) |
1059 | { |
1060 | int64_t pos = m4af_tell(ctx); |
1061 | m4af_write(ctx, "\0\0\0\0", 4); |
1062 | m4af_write32(ctx, entry->type); |
1063 | if (entry->type != M4AF_FOURCC('-','-','-','-')) |
1064 | m4af_data_box(ctx, entry->u.type_code, entry->data, entry->data_size); |
1065 | else { |
1066 | m4af_mean_box(ctx); |
1067 | m4af_name_box(ctx, entry->u.name); |
1068 | m4af_data_box(ctx, 1, entry->data, entry->data_size); |
1069 | } |
1070 | m4af_update_size(ctx, pos); |
1071 | } |
1072 | |
1073 | static |
1074 | void m4af_ilst_box(m4af_writer_t *ctx) |
1075 | { |
1076 | uint32_t i; |
1077 | int64_t pos = m4af_tell(ctx); |
1078 | m4af_write(ctx, "\0\0\0\0ilst", 8); |
1079 | for (i = 0; i < ctx->num_tags; ++i) |
1080 | m4af_write_metadata(ctx, &ctx->itmf_table[i]); |
1081 | m4af_update_size(ctx, pos); |
1082 | } |
1083 | |
1084 | static |
1085 | void m4af_meta_box(m4af_writer_t *ctx) |
1086 | { |
1087 | int64_t pos = m4af_tell(ctx); |
1088 | m4af_write(ctx, |
1089 | "\0\0\0\0" /* size */ |
1090 | "meta" /* type */ |
1091 | "\0" /* version */ |
1092 | "\0\0\0" /* flags */ |
1093 | , 12); |
1094 | m4af_hdlr_box(ctx, 0, "mdir"); |
1095 | m4af_ilst_box(ctx); |
1096 | m4af_update_size(ctx, pos); |
1097 | } |
1098 | |
1099 | static |
1100 | void m4af_udta_box(m4af_writer_t *ctx) |
1101 | { |
1102 | int64_t pos = m4af_tell(ctx); |
1103 | m4af_write(ctx, "\0\0\0\0udta", 8); |
1104 | m4af_meta_box(ctx); |
1105 | m4af_update_size(ctx, pos); |
1106 | } |
1107 | |
1108 | static |
1109 | void m4af_moov_box(m4af_writer_t *ctx) |
1110 | { |
1111 | unsigned i; |
1112 | int64_t pos = m4af_tell(ctx); |
1113 | m4af_write(ctx, "\0\0\0\0moov", 8); |
1114 | m4af_mvhd_box(ctx); |
1115 | for (i = 0; i < ctx->num_tracks; ++i) |
1116 | m4af_trak_box(ctx, i); |
1117 | if (ctx->num_tags) |
1118 | m4af_udta_box(ctx); |
1119 | m4af_update_size(ctx, pos); |
1120 | } |
1121 | |
1122 | static |
1123 | void m4af_finalize_mdat(m4af_writer_t *ctx) |
1124 | { |
1125 | if (ctx->mdat_size + 8 > UINT32_MAX) { |
1126 | m4af_set_pos(ctx, ctx->mdat_pos - 16); |
1127 | m4af_write32(ctx, 1); |
1128 | m4af_write(ctx, "mdat", 4); |
1129 | m4af_write64(ctx, ctx->mdat_size + 16); |
1130 | } else { |
1131 | m4af_set_pos(ctx, ctx->mdat_pos - 8); |
1132 | m4af_write32(ctx, ctx->mdat_size + 8); |
1133 | } |
1134 | m4af_set_pos(ctx, ctx->mdat_pos + ctx->mdat_size); |
1135 | } |
1136 | |
1137 | int m4af_finalize(m4af_writer_t *ctx) |
1138 | { |
1139 | unsigned i; |
1140 | m4af_track_t *track; |
1141 | |
1142 | for (i = 0; i < ctx->num_tracks; ++i) { |
1143 | track = ctx->track + i; |
1144 | if (track->duration) { |
1145 | int64_t track_size = 0; |
1146 | unsigned j; |
1147 | for (j = 0; j < track->num_chunks; ++j) |
1148 | track_size += track->chunk_table[j].size; |
1149 | track->avgBitrate = |
1150 | 8.0 * track_size * track->timescale / track->duration + .5; |
1151 | } |
1152 | m4af_flush_chunk(ctx, i); |
1153 | } |
1154 | if (ctx->track[0].encoder_delay || ctx->track[0].padding) |
1155 | m4af_set_iTunSMPB(ctx); |
1156 | m4af_finalize_mdat(ctx); |
1157 | m4af_moov_box(ctx); |
1158 | return ctx->last_error ? -1 : 0; |
1159 | } |
1160 | |
1161 | static |
1162 | void m4af_free_itmf_table(m4af_writer_t *ctx) |
1163 | { |
1164 | uint32_t i; |
1165 | m4af_itmf_entry_t *entry = ctx->itmf_table; |
1166 | for (i = 0; i < ctx->num_tags; ++i, ++entry) { |
1167 | if (entry->type == M4AF_FOURCC('-','-','-','-')) |
1168 | m4af_free(entry->u.name); |
1169 | m4af_free(entry->data); |
1170 | } |
1171 | m4af_free(ctx->itmf_table); |
1172 | } |
1173 | |
1174 | void m4af_teardown(m4af_writer_t **ctxp) |
1175 | { |
1176 | unsigned i; |
1177 | m4af_writer_t *ctx = *ctxp; |
1178 | m4af_track_t *track; |
1179 | for (i = 0; i < ctx->num_tracks; ++i) { |
1180 | track = ctx->track + i; |
1181 | if (track->decSpecificInfo) |
1182 | m4af_free(track->decSpecificInfo); |
1183 | if (track->sample_table) |
1184 | m4af_free(track->sample_table); |
1185 | if (track->chunk_table) |
1186 | m4af_free(track->chunk_table); |
1187 | if (track->chunk_buffer) |
1188 | m4af_free(track->chunk_buffer); |
1189 | } |
1190 | if (ctx->itmf_table) |
1191 | m4af_free_itmf_table(ctx); |
1192 | m4af_free(ctx); |
1193 | *ctxp = 0; |
1194 | } |