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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 | ||
459 | int m4af_add_itmf_int32_tag(m4af_writer_t *ctx, uint32_t type, int value) | |
460 | { | |
461 | uint32_t data = m4af_htob32(value); | |
462 | return m4af_add_itmf_short_tag(ctx, type, M4AF_INTEGER, &data, 4); | |
463 | } | |
464 | ||
465 | int m4af_add_itmf_track_tag(m4af_writer_t *ctx, int track, int total) | |
466 | { | |
467 | uint16_t data[4] = { 0 }; | |
468 | data[1] = m4af_htob16(track); | |
469 | data[2] = m4af_htob16(total); | |
470 | return m4af_add_itmf_short_tag(ctx, M4AF_FOURCC('t','r','k','n'), | |
471 | M4AF_IMPLICIT, &data, 8); | |
472 | } | |
473 | ||
474 | int m4af_add_itmf_disk_tag(m4af_writer_t *ctx, int disk, int total) | |
475 | { | |
476 | uint16_t data[3] = { 0 }; | |
477 | data[1] = m4af_htob16(disk); | |
478 | data[2] = m4af_htob16(total); | |
479 | return m4af_add_itmf_short_tag(ctx, M4AF_FOURCC('d','i','s','k'), | |
480 | M4AF_IMPLICIT, &data, 6); | |
481 | } | |
482 | ||
483 | int m4af_add_itmf_genre_tag(m4af_writer_t *ctx, int genre) | |
484 | { | |
485 | uint16_t data = m4af_htob16(genre); | |
486 | return m4af_add_itmf_short_tag(ctx, M4AF_FOURCC('g','n','r','e'), | |
487 | M4AF_IMPLICIT, &data, 2); | |
488 | } | |
489 | ||
490 | static | |
491 | int m4af_set_iTunSMPB(m4af_writer_t *ctx) | |
492 | { | |
493 | const char *template = " 00000000 %08X %08X %08X%08X 00000000 00000000 " | |
494 | "00000000 00000000 00000000 00000000 00000000 00000000"; | |
495 | m4af_track_t *track = &ctx->track[0]; | |
496 | char buf[256]; | |
497 | uint64_t length = track->duration - track->encoder_delay - track->padding; | |
498 | sprintf(buf, template, track->encoder_delay, track->padding, | |
499 | (uint32_t)(length >> 32), (uint32_t)length); | |
500 | return m4af_add_itmf_long_tag(ctx, "iTunSMPB", buf); | |
501 | } | |
502 | ||
503 | static | |
504 | void m4af_update_size(m4af_writer_t *ctx, int64_t pos) | |
505 | { | |
506 | int64_t current_pos = m4af_tell(ctx); | |
507 | m4af_set_pos(ctx, pos); | |
508 | m4af_write32(ctx, current_pos - pos); | |
509 | m4af_set_pos(ctx, current_pos); | |
510 | } | |
511 | ||
512 | static | |
513 | int m4af_head_version(m4af_writer_t *ctx, int track_idx) | |
514 | { | |
515 | m4af_track_t *track = &ctx->track[track_idx]; | |
516 | return track->duration > UINT32_MAX | |
517 | || track->creation_time > UINT32_MAX | |
518 | || track->modification_time > UINT32_MAX; | |
519 | } | |
520 | ||
521 | static | |
522 | void m4af_descriptor(m4af_writer_t *ctx, uint32_t tag, uint32_t size) | |
523 | { | |
524 | uint8_t buf[5]; | |
525 | buf[0] = tag; | |
526 | buf[1] = ((size >> 21) | 0x80); | |
527 | buf[2] = ((size >> 14) | 0x80); | |
528 | buf[3] = ((size >> 7) | 0x80); | |
529 | buf[4] = (size & 0x7f); | |
530 | m4af_write(ctx, buf, 5); | |
531 | } | |
532 | ||
533 | static | |
534 | void m4af_ftyp_box(m4af_writer_t *ctx) | |
535 | { | |
536 | m4af_write(ctx, "\0\0\0\040""ftypM4A \0\0\0\0M4A mp42isom\0\0\0\0", 32); | |
537 | } | |
538 | ||
539 | static | |
540 | void m4af_free_box(m4af_writer_t *ctx, uint32_t size) | |
541 | { | |
542 | int64_t pos = m4af_tell(ctx); | |
543 | m4af_write32(ctx, size + 8); | |
544 | m4af_write(ctx, "free", 4); | |
545 | if (size > 0) | |
546 | m4af_set_pos(ctx, pos + size + 8); | |
547 | } | |
548 | ||
549 | int m4af_begin_write(m4af_writer_t *ctx) | |
550 | { | |
551 | m4af_ftyp_box(ctx); | |
552 | m4af_free_box(ctx, 0); | |
553 | m4af_write(ctx, "\0\0\0\0mdat", 8); | |
554 | ctx->mdat_pos = m4af_tell(ctx); | |
555 | return ctx->last_error ? -1 : 0; | |
556 | } | |
557 | ||
558 | static | |
559 | void m4af_stco_box(m4af_writer_t *ctx, int track_idx) | |
560 | { | |
561 | m4af_track_t *track = &ctx->track[track_idx]; | |
562 | uint32_t i; | |
563 | m4af_chunk_entry_t *index = track->chunk_table; | |
564 | int is_co64 = (ctx->mdat_pos + ctx->mdat_size > UINT32_MAX); | |
565 | int64_t pos = m4af_tell(ctx); | |
566 | ||
567 | m4af_write32(ctx, 0); /* size */ | |
568 | m4af_write(ctx, is_co64 ? "co64" : "stco", 4); | |
569 | m4af_write32(ctx, 0); /* version and flags */ | |
570 | m4af_write32(ctx, track->num_chunks); | |
571 | for (i = 0; i < track->num_chunks; ++i, ++index) { | |
572 | if (is_co64) | |
573 | m4af_write64(ctx, index->offset); | |
574 | else | |
575 | m4af_write32(ctx, index->offset); | |
576 | } | |
577 | m4af_update_size(ctx, pos); | |
578 | } | |
579 | ||
580 | static | |
581 | void m4af_stsz_box(m4af_writer_t *ctx, int track_idx) | |
582 | { | |
583 | m4af_track_t *track = &ctx->track[track_idx]; | |
584 | m4af_sample_entry_t *index = track->sample_table; | |
585 | uint32_t i; | |
586 | int64_t pos = m4af_tell(ctx); | |
587 | m4af_write(ctx, | |
588 | "\0\0\0\0" /* size */ | |
589 | "stsz" /* type */ | |
590 | "\0" /* version */ | |
591 | "\0\0\0" /* flags */ | |
592 | "\0\0\0\0" /* sample_size: 0(variable) */ | |
593 | , 16); | |
594 | m4af_write32(ctx, track->num_samples); | |
595 | for (i = 0; i < track->num_samples; ++i, ++index) | |
596 | m4af_write32(ctx, index->size); | |
597 | m4af_update_size(ctx, pos); | |
598 | } | |
599 | ||
600 | static | |
601 | void m4af_stsc_box(m4af_writer_t *ctx, int track_idx) | |
602 | { | |
603 | m4af_track_t *track = &ctx->track[track_idx]; | |
604 | m4af_chunk_entry_t *index = track->chunk_table; | |
605 | uint32_t i, prev_samples_per_chunk = 0, entry_count = 0; | |
606 | int64_t pos = m4af_tell(ctx); | |
607 | m4af_write(ctx, | |
608 | "\0\0\0\0" /* size */ | |
609 | "stsc" /* type */ | |
610 | "\0" /* version */ | |
611 | "\0\0\0" /* flags */ | |
612 | "\0\0\0\0" /* entry_count */ | |
613 | , 16); | |
614 | ||
615 | for (i = 0; i < track->num_chunks; ++i, ++index) { | |
616 | if (index->samples_per_chunk != prev_samples_per_chunk) { | |
617 | ++entry_count; | |
618 | m4af_write32(ctx, i + 1); | |
619 | m4af_write32(ctx, index->samples_per_chunk); | |
620 | m4af_write32(ctx, 1); /* sample_description_index */ | |
621 | prev_samples_per_chunk = index->samples_per_chunk; | |
622 | } | |
623 | } | |
624 | m4af_write32_at(ctx, pos + 12, entry_count); | |
625 | m4af_update_size(ctx, pos); | |
626 | } | |
627 | ||
628 | static | |
629 | void m4af_stts_box(m4af_writer_t *ctx, int track_idx) | |
630 | { | |
631 | m4af_track_t *track = &ctx->track[track_idx]; | |
632 | m4af_sample_entry_t *index = track->sample_table; | |
633 | uint32_t i, prev_delta = 0, entry_count = 0, sample_count = 0; | |
634 | int64_t pos = m4af_tell(ctx); | |
635 | m4af_write(ctx, | |
636 | "\0\0\0\0" /* size */ | |
637 | "stts" /* type */ | |
638 | "\0" /* version */ | |
639 | "\0\0\0" /* flags */ | |
640 | "\0\0\0\0" /* entry_count */ | |
641 | , 16); | |
642 | ||
643 | for (i = 0; i < track->num_samples; ++i, ++index) { | |
644 | if (index->delta == prev_delta) | |
645 | ++sample_count; | |
646 | else { | |
647 | ++entry_count; | |
648 | if (sample_count) { | |
649 | m4af_write32(ctx, sample_count); | |
650 | m4af_write32(ctx, prev_delta); | |
651 | } | |
652 | prev_delta = index->delta; | |
653 | sample_count = 1; | |
654 | } | |
655 | } | |
656 | if (sample_count) { | |
657 | m4af_write32(ctx, sample_count); | |
658 | m4af_write32(ctx, prev_delta); | |
659 | } | |
660 | m4af_write32_at(ctx, pos + 12, entry_count); | |
661 | m4af_update_size(ctx, pos); | |
662 | } | |
663 | ||
664 | static | |
665 | void m4af_esds_box(m4af_writer_t *ctx, int track_idx) | |
666 | { | |
667 | m4af_track_t *track = &ctx->track[track_idx]; | |
668 | int64_t pos = m4af_tell(ctx); | |
669 | m4af_write(ctx, "\0\0\0\0esds", 8); | |
670 | m4af_write32(ctx, 0); /* version + flags */ | |
671 | ||
672 | /* ES_Descriptor */ | |
673 | m4af_descriptor(ctx, 3, 32 + track->decSpecificInfoSize); | |
674 | m4af_write(ctx, "\0\0\0", 3); | |
675 | /* DecoderConfigDescriptor */ | |
676 | m4af_descriptor(ctx, 4, 18 + track->decSpecificInfoSize); | |
677 | m4af_write(ctx, | |
678 | "\x40" /* objectTypeIndication: 0x40(Audio ISO/IEC 14496-3)*/ | |
679 | "\x15" /* streamType(6): 0x05(AudioStream) | |
680 | * upStream(1) : 0 | |
681 | * reserved(1) : 1 | |
682 | */ | |
683 | , 2); | |
684 | m4af_write24(ctx, track->bufferSizeDB); | |
685 | m4af_write32(ctx, track->maxBitrate); | |
686 | m4af_write32(ctx, track->avgBitrate); | |
687 | /* DecoderSpecificInfo */ | |
688 | m4af_descriptor(ctx, 5, track->decSpecificInfoSize); | |
689 | m4af_write(ctx, track->decSpecificInfo, track->decSpecificInfoSize); | |
690 | /* SLConfigDescriptor */ | |
691 | m4af_descriptor(ctx, 6, 1); | |
692 | m4af_write(ctx, "\002", 1); /* predefined */ | |
693 | ||
694 | m4af_update_size(ctx, pos); | |
695 | } | |
696 | ||
697 | static | |
698 | void m4af_alac_box(m4af_writer_t *ctx, int track_idx) | |
699 | { | |
700 | m4af_track_t *track = &ctx->track[track_idx]; | |
701 | int64_t pos = m4af_tell(ctx); | |
702 | m4af_write(ctx, | |
703 | "\0\0\0\0" /* size */ | |
704 | "alac" /* type */ | |
705 | "\0" /* version */ | |
706 | "\0\0\0" /* flags */ | |
707 | , 12); | |
708 | m4af_write(ctx, track->decSpecificInfo, track->decSpecificInfoSize); | |
709 | m4af_update_size(ctx, pos); | |
710 | } | |
711 | ||
712 | static | |
713 | void m4af_mp4a_box(m4af_writer_t *ctx, int track_idx) | |
714 | { | |
715 | m4af_track_t *track = &ctx->track[track_idx]; | |
716 | int64_t pos = m4af_tell(ctx); | |
717 | m4af_write32(ctx, 0); /* size */ | |
718 | m4af_write32(ctx, track->codec); /* mp4a or alac */ | |
719 | m4af_write(ctx, | |
720 | "\0\0\0\0\0\0" /* reserved */ | |
721 | "\0\001" /* data_reference_index: 1 */ | |
722 | "\0\0\0\0" /* reserved[0] */ | |
723 | "\0\0\0\0" /* reserved[1] */ | |
724 | "\0\002" /* channelcount: 2 */ | |
725 | "\0\020" /* samplesize: 16 */ | |
726 | "\0\0" /* pre_defined */ | |
727 | "\0\0" /* reserved */ | |
728 | ,24); | |
729 | if (track->codec == M4AF_FOURCC('m','p','4','a')) { | |
730 | m4af_write32(ctx, track->timescale << 16); | |
731 | m4af_esds_box(ctx, track_idx); | |
732 | } else { | |
733 | m4af_write32(ctx, 44100); | |
734 | m4af_alac_box(ctx, track_idx); | |
735 | } | |
736 | m4af_update_size(ctx, pos); | |
737 | } | |
738 | ||
739 | static | |
740 | void m4af_stsd_box(m4af_writer_t *ctx, int track_idx) | |
741 | { | |
742 | int64_t pos = m4af_tell(ctx); | |
743 | m4af_write(ctx, "\0\0\0\0stsd", 8); | |
744 | m4af_write(ctx, | |
745 | "\0" /* version */ | |
746 | "\0\0\0" /* flags */ | |
747 | "\0\0\0\001" /* entry_count: 1 */ | |
748 | , 8); | |
749 | m4af_mp4a_box(ctx, track_idx); | |
750 | m4af_update_size(ctx, pos); | |
751 | } | |
752 | ||
753 | static | |
754 | void m4af_stbl_box(m4af_writer_t *ctx, int track_idx) | |
755 | { | |
756 | int64_t pos = m4af_tell(ctx); | |
757 | m4af_write(ctx, "\0\0\0\0stbl", 8); | |
758 | m4af_stsd_box(ctx, track_idx); | |
759 | m4af_stts_box(ctx, track_idx); | |
760 | m4af_stsc_box(ctx, track_idx); | |
761 | m4af_stsz_box(ctx, track_idx); | |
762 | m4af_stco_box(ctx, track_idx); | |
763 | m4af_update_size(ctx, pos); | |
764 | } | |
765 | ||
766 | static | |
767 | void m4af_url_box(m4af_writer_t *ctx, int track_idx) | |
768 | { | |
769 | m4af_write(ctx, | |
770 | "\0\0\0\014" /* size */ | |
771 | "url " /* type */ | |
772 | "\0" /* version */ | |
773 | "\0\0\001" /* flags: 1(in the same file) */ | |
774 | , 12); | |
775 | } | |
776 | ||
777 | static | |
778 | void m4af_dref_box(m4af_writer_t *ctx, int track_idx) | |
779 | { | |
780 | int64_t pos = m4af_tell(ctx); | |
781 | m4af_write(ctx, "\0\0\0\0dref", 8); | |
782 | m4af_write(ctx, | |
783 | "\0" /* version */ | |
784 | "\0\0\0" /* flags */ | |
785 | "\0\0\0\001" /* entry_count: 1 */ | |
786 | ,8); | |
787 | m4af_url_box(ctx, track_idx); | |
788 | m4af_update_size(ctx, pos); | |
789 | } | |
790 | ||
791 | static | |
792 | void m4af_dinf_box(m4af_writer_t *ctx, int track_idx) | |
793 | { | |
794 | int64_t pos = m4af_tell(ctx); | |
795 | m4af_write(ctx, "\0\0\0\0dinf", 8); | |
796 | m4af_dref_box(ctx, track_idx); | |
797 | m4af_update_size(ctx, pos); | |
798 | } | |
799 | ||
800 | static | |
801 | void m4af_smhd_box(m4af_writer_t *ctx, int track_idx) | |
802 | { | |
803 | m4af_write(ctx, | |
804 | "\0\0\0\020" /* size */ | |
805 | "smhd" /* type */ | |
806 | "\0" /* version */ | |
807 | "\0\0\0" /* flags */ | |
808 | "\0\0" /* balance */ | |
809 | "\0\0" /* reserved */ | |
810 | , 16); | |
811 | } | |
812 | ||
813 | static | |
814 | void m4af_minf_box(m4af_writer_t *ctx, int track_idx) | |
815 | { | |
816 | m4af_track_t *track = &ctx->track[track_idx]; | |
817 | int64_t pos = m4af_tell(ctx); | |
818 | m4af_write(ctx, "\0\0\0\0minf", 8); | |
819 | /* TODO: add TEXT support */ | |
820 | if (track->codec != M4AF_CODEC_TEXT) | |
821 | m4af_smhd_box(ctx, track_idx); | |
822 | m4af_dinf_box(ctx, track_idx); | |
823 | m4af_stbl_box(ctx, track_idx); | |
824 | m4af_update_size(ctx, pos); | |
825 | } | |
826 | ||
827 | static | |
828 | void m4af_mdhd_box(m4af_writer_t *ctx, int track_idx) | |
829 | { | |
830 | m4af_track_t *track = &ctx->track[track_idx]; | |
831 | int64_t pos = m4af_tell(ctx); | |
832 | uint8_t version = m4af_head_version(ctx, track_idx); | |
833 | ||
834 | m4af_write(ctx, "\0\0\0\0mdhd", 8); | |
835 | m4af_write(ctx, &version, 1); | |
836 | m4af_write(ctx, "\0\0\0", 3); /* flags */ | |
837 | if (version) { | |
838 | m4af_write64(ctx, track->creation_time); | |
839 | m4af_write64(ctx, track->modification_time); | |
840 | m4af_write32(ctx, track->timescale); | |
841 | m4af_write64(ctx, track->duration); | |
842 | } else { | |
843 | m4af_write32(ctx, track->creation_time); | |
844 | m4af_write32(ctx, track->modification_time); | |
845 | m4af_write32(ctx, track->timescale); | |
846 | m4af_write32(ctx, track->duration); | |
847 | } | |
848 | m4af_write(ctx, | |
849 | "\x55\xc4" /* language: und */ | |
850 | "\0\0" /* pre_defined */ | |
851 | , 4); | |
852 | m4af_update_size(ctx, pos); | |
853 | } | |
854 | ||
855 | static | |
856 | void m4af_hdlr_box(m4af_writer_t *ctx, int track_idx, const char *type) | |
857 | { | |
858 | int64_t pos = m4af_tell(ctx); | |
859 | static const char reserved_and_name[10] = { 0 }; | |
860 | ||
861 | m4af_write(ctx, | |
862 | "\0\0\0\0" /* size */ | |
863 | "hdlr" /* type */ | |
864 | "\0" /* version */ | |
865 | "\0\0\0" /* flags */ | |
866 | "\0\0\0\0" /* pre_defined */ | |
867 | , 16); | |
868 | m4af_write(ctx, type, 4); /* handler_type */ | |
869 | /* reserved[0] */ | |
870 | m4af_write(ctx, !strcmp(type, "mdir") ? "appl" : "\0\0\0\0", 4); | |
871 | /* reserved[1], reserved[2], name */ | |
872 | m4af_write(ctx, reserved_and_name, (pos & 1) ? 9 : 10); | |
873 | m4af_update_size(ctx, pos); | |
874 | } | |
875 | ||
876 | static | |
877 | void m4af_mdia_box(m4af_writer_t *ctx, int track_idx) | |
878 | { | |
879 | m4af_track_t *track = &ctx->track[track_idx]; | |
880 | const char *hdlr = | |
881 | (track->codec == M4AF_CODEC_TEXT) ? "text" : "soun"; | |
882 | int64_t pos = m4af_tell(ctx); | |
883 | m4af_write(ctx, "\0\0\0\0mdia", 8); | |
884 | m4af_mdhd_box(ctx, track_idx); | |
885 | m4af_hdlr_box(ctx, track_idx, hdlr); | |
886 | m4af_minf_box(ctx, track_idx); | |
887 | m4af_update_size(ctx, pos); | |
888 | } | |
889 | ||
890 | static | |
891 | void m4af_tkhd_box(m4af_writer_t *ctx, int track_idx) | |
892 | { | |
893 | m4af_track_t *track = &ctx->track[track_idx]; | |
894 | int64_t pos = m4af_tell(ctx); | |
895 | uint8_t version = m4af_head_version(ctx, track_idx); | |
896 | m4af_write(ctx, "\0\0\0\0tkhd", 8); | |
897 | m4af_write(ctx, &version, 1); | |
898 | m4af_write(ctx, "\0\0\007", 3); /* flags */ | |
899 | if (version) { | |
900 | m4af_write64(ctx, track->creation_time); | |
901 | m4af_write64(ctx, track->modification_time); | |
902 | m4af_write32(ctx, track_idx + 1); | |
903 | m4af_write(ctx, "\0\0\0\0" /* reserved */ | |
904 | , 4); | |
905 | m4af_write64(ctx, track->duration); | |
906 | } else { | |
907 | m4af_write32(ctx, track->creation_time); | |
908 | m4af_write32(ctx, track->modification_time); | |
909 | m4af_write32(ctx, track_idx + 1); | |
910 | m4af_write(ctx, "\0\0\0\0" /* reserved */ | |
911 | , 4); | |
912 | m4af_write32(ctx, track->duration); | |
913 | } | |
914 | m4af_write(ctx, | |
915 | "\0\0\0\0" /* reserved[0] */ | |
916 | "\0\0\0\0" /* reserved[1] */ | |
917 | "\0\0" /* layer */ | |
918 | "\0\0" /* alternate_group */ | |
919 | "\001\0" /* volume: 1.0 */ | |
920 | "\0\0" /* reserved */ | |
921 | "\0\001\0\0" /* matrix[0] */ | |
922 | "\0\0\0\0" /* matrix[1] */ | |
923 | "\0\0\0\0" /* matrix[2] */ | |
924 | "\0\0\0\0" /* matrix[3] */ | |
925 | "\0\001\0\0" /* matrix[4] */ | |
926 | "\0\0\0\0" /* matrix[5] */ | |
927 | "\0\0\0\0" /* matrix[6] */ | |
928 | "\0\0\0\0" /* matrix[7] */ | |
929 | "\100\0\0\0" /* matrix[8] */ | |
930 | "\0\0\0\0" /* width */ | |
931 | "\0\0\0\0" /* height */ | |
932 | , 60); | |
933 | m4af_update_size(ctx, pos); | |
934 | } | |
935 | ||
936 | static | |
937 | void m4af_trak_box(m4af_writer_t *ctx, int track_idx) | |
938 | { | |
939 | int64_t pos = m4af_tell(ctx); | |
940 | m4af_write(ctx, "\0\0\0\0trak", 8); | |
941 | m4af_tkhd_box(ctx, track_idx); | |
942 | m4af_mdia_box(ctx, track_idx); | |
943 | m4af_update_size(ctx, pos); | |
944 | } | |
945 | ||
946 | static | |
947 | int64_t m4af_movie_duration(m4af_writer_t *ctx) | |
948 | { | |
949 | int64_t movie_duration = 0; | |
950 | unsigned i; | |
951 | for (i = 0; i < ctx->num_tracks; ++i) { | |
952 | double x = ctx->track[i].duration; | |
953 | int64_t duration = x * ctx->track[i].timescale / ctx->timescale + .5; | |
954 | if (duration > movie_duration) | |
955 | movie_duration = duration; | |
956 | } | |
957 | return movie_duration; | |
958 | } | |
959 | ||
960 | static | |
961 | void m4af_mvhd_box(m4af_writer_t *ctx) | |
962 | { | |
963 | int64_t pos = m4af_tell(ctx); | |
964 | uint8_t version = m4af_head_version(ctx, 0); | |
965 | int64_t movie_duration = m4af_movie_duration(ctx); | |
966 | ||
967 | m4af_write(ctx, "\0\0\0\0mvhd", 8); | |
968 | m4af_write(ctx, &version, 1); | |
969 | m4af_write(ctx, "\0\0\0", 3); /* flags */ | |
970 | if (version) { | |
971 | m4af_write64(ctx, ctx->creation_time); | |
972 | m4af_write64(ctx, ctx->modification_time); | |
973 | m4af_write32(ctx, ctx->timescale); | |
974 | m4af_write64(ctx, movie_duration); | |
975 | } else { | |
976 | m4af_write32(ctx, ctx->creation_time); | |
977 | m4af_write32(ctx, ctx->modification_time); | |
978 | m4af_write32(ctx, ctx->timescale); | |
979 | m4af_write32(ctx, movie_duration); | |
980 | } | |
981 | m4af_write(ctx, | |
982 | "\0\001\0\0" /* rate: 1.0 */ | |
983 | "\001\0" /* volume: 1.0 */ | |
984 | "\0\0" /* reserved */ | |
985 | "\0\0\0\0" /* reserved[0] */ | |
986 | "\0\0\0\0" /* reserved[1] */ | |
987 | "\0\001\0\0" /* matrix[0] */ | |
988 | "\0\0\0\0" /* matrix[1] */ | |
989 | "\0\0\0\0" /* matrix[2] */ | |
990 | "\0\0\0\0" /* matrix[3] */ | |
991 | "\0\001\0\0" /* matrix[4] */ | |
992 | "\0\0\0\0" /* matrix[5] */ | |
993 | "\0\0\0\0" /* matrix[6] */ | |
994 | "\0\0\0\0" /* matrix[7] */ | |
995 | "\100\0\0\0" /* matrix[8] */ | |
996 | "\0\0\0\0" /* pre_defined[0] */ | |
997 | "\0\0\0\0" /* pre_defined[1] */ | |
998 | "\0\0\0\0" /* pre_defined[2] */ | |
999 | "\0\0\0\0" /* pre_defined[3] */ | |
1000 | "\0\0\0\0" /* pre_defined[4] */ | |
1001 | "\0\0\0\0" /* pre_defined[5] */ | |
1002 | , 76); | |
1003 | m4af_write32(ctx, ctx->num_tracks + 1); | |
1004 | m4af_update_size(ctx, pos); | |
1005 | } | |
1006 | ||
1007 | static | |
1008 | void m4af_mean_box(m4af_writer_t *ctx) | |
1009 | { | |
1010 | m4af_write(ctx, | |
1011 | "\0\0\0\034" /* size */ | |
1012 | "mean" | |
1013 | "\0" /* version */ | |
1014 | "\0\0\0" /* flags */ | |
1015 | "com.apple.iTunes" /* meaning-string */ | |
1016 | , 28); | |
1017 | } | |
1018 | ||
1019 | static | |
1020 | void m4af_name_box(m4af_writer_t *ctx, const char *name) | |
1021 | { | |
1022 | int64_t pos = m4af_tell(ctx); | |
1023 | m4af_write(ctx, | |
1024 | "\0\0\0\0" /* size */ | |
1025 | "name" /* type */ | |
1026 | "\0" /* version */ | |
1027 | "\0\0\0" /* flags */ | |
1028 | , 12); | |
1029 | m4af_write(ctx, name, strlen(name)); | |
1030 | m4af_update_size(ctx, pos); | |
1031 | } | |
1032 | ||
1033 | static | |
1034 | void m4af_data_box(m4af_writer_t *ctx, uint32_t type_code, | |
1035 | const char *data, uint32_t data_size) | |
1036 | { | |
1037 | int64_t pos = m4af_tell(ctx); | |
1038 | uint8_t code = type_code; | |
1039 | m4af_write(ctx, | |
1040 | "\0\0\0\0" /* size */ | |
1041 | "data" /* type */ | |
1042 | "\0\0" /* reserved */ | |
1043 | "\0" /* type_set_indifier */ | |
1044 | ,11); | |
1045 | m4af_write(ctx, &code, 1); | |
1046 | m4af_write(ctx, "\0\0\0\0", 4); /* locale */ | |
1047 | m4af_write(ctx, data, data_size); | |
1048 | m4af_update_size(ctx, pos); | |
1049 | } | |
1050 | ||
1051 | static | |
1052 | void m4af_write_metadata(m4af_writer_t *ctx, m4af_itmf_entry_t *entry) | |
1053 | { | |
1054 | int64_t pos = m4af_tell(ctx); | |
1055 | m4af_write(ctx, "\0\0\0\0", 4); | |
1056 | m4af_write32(ctx, entry->type); | |
1057 | if (entry->type != M4AF_FOURCC('-','-','-','-')) | |
1058 | m4af_data_box(ctx, entry->u.type_code, entry->data, entry->data_size); | |
1059 | else { | |
1060 | m4af_mean_box(ctx); | |
1061 | m4af_name_box(ctx, entry->u.name); | |
1062 | m4af_data_box(ctx, 1, entry->data, entry->data_size); | |
1063 | } | |
1064 | m4af_update_size(ctx, pos); | |
1065 | } | |
1066 | ||
1067 | static | |
1068 | void m4af_ilst_box(m4af_writer_t *ctx) | |
1069 | { | |
1070 | uint32_t i; | |
1071 | int64_t pos = m4af_tell(ctx); | |
1072 | m4af_write(ctx, "\0\0\0\0ilst", 8); | |
1073 | for (i = 0; i < ctx->num_tags; ++i) | |
1074 | m4af_write_metadata(ctx, &ctx->itmf_table[i]); | |
1075 | m4af_update_size(ctx, pos); | |
1076 | } | |
1077 | ||
1078 | static | |
1079 | void m4af_meta_box(m4af_writer_t *ctx) | |
1080 | { | |
1081 | int64_t pos = m4af_tell(ctx); | |
1082 | m4af_write(ctx, | |
1083 | "\0\0\0\0" /* size */ | |
1084 | "meta" /* type */ | |
1085 | "\0" /* version */ | |
1086 | "\0\0\0" /* flags */ | |
1087 | , 12); | |
1088 | m4af_hdlr_box(ctx, 0, "mdir"); | |
1089 | m4af_ilst_box(ctx); | |
1090 | m4af_update_size(ctx, pos); | |
1091 | } | |
1092 | ||
1093 | static | |
1094 | void m4af_udta_box(m4af_writer_t *ctx) | |
1095 | { | |
1096 | int64_t pos = m4af_tell(ctx); | |
1097 | m4af_write(ctx, "\0\0\0\0udta", 8); | |
1098 | m4af_meta_box(ctx); | |
1099 | m4af_update_size(ctx, pos); | |
1100 | } | |
1101 | ||
1102 | static | |
1103 | void m4af_moov_box(m4af_writer_t *ctx) | |
1104 | { | |
1105 | unsigned i; | |
1106 | int64_t pos = m4af_tell(ctx); | |
1107 | m4af_write(ctx, "\0\0\0\0moov", 8); | |
1108 | m4af_mvhd_box(ctx); | |
1109 | for (i = 0; i < ctx->num_tracks; ++i) | |
1110 | m4af_trak_box(ctx, i); | |
1111 | if (ctx->num_tags) | |
1112 | m4af_udta_box(ctx); | |
1113 | m4af_update_size(ctx, pos); | |
1114 | } | |
1115 | ||
1116 | static | |
1117 | void m4af_finalize_mdat(m4af_writer_t *ctx) | |
1118 | { | |
1119 | if (ctx->mdat_size + 8 > UINT32_MAX) { | |
1120 | m4af_set_pos(ctx, ctx->mdat_pos - 16); | |
1121 | m4af_write32(ctx, 1); | |
1122 | m4af_write(ctx, "mdat", 4); | |
1123 | m4af_write64(ctx, ctx->mdat_size + 16); | |
1124 | } else { | |
1125 | m4af_set_pos(ctx, ctx->mdat_pos - 8); | |
1126 | m4af_write32(ctx, ctx->mdat_size + 8); | |
1127 | } | |
1128 | m4af_set_pos(ctx, ctx->mdat_pos + ctx->mdat_size); | |
1129 | } | |
1130 | ||
1131 | int m4af_finalize(m4af_writer_t *ctx) | |
1132 | { | |
1133 | unsigned i; | |
1134 | m4af_track_t *track; | |
1135 | ||
1136 | for (i = 0; i < ctx->num_tracks; ++i) { | |
1137 | track = ctx->track + i; | |
1138 | if (track->duration) { | |
1139 | int64_t track_size = 0; | |
1140 | unsigned j; | |
1141 | for (j = 0; j < track->num_chunks; ++j) | |
1142 | track_size += track->chunk_table[j].size; | |
1143 | track->avgBitrate = | |
1144 | 8.0 * track_size * track->timescale / track->duration + .5; | |
1145 | } | |
1146 | m4af_flush_chunk(ctx, i); | |
1147 | } | |
1148 | if (ctx->track[0].encoder_delay || ctx->track[0].padding) | |
1149 | m4af_set_iTunSMPB(ctx); | |
1150 | m4af_finalize_mdat(ctx); | |
1151 | m4af_moov_box(ctx); | |
1152 | return ctx->last_error ? -1 : 0; | |
1153 | } | |
1154 | ||
1155 | static | |
1156 | void m4af_free_itmf_table(m4af_writer_t *ctx) | |
1157 | { | |
1158 | uint32_t i; | |
1159 | m4af_itmf_entry_t *entry = ctx->itmf_table; | |
1160 | for (i = 0; i < ctx->num_tags; ++i, ++entry) { | |
1161 | if (entry->type == M4AF_FOURCC('-','-','-','-')) | |
1162 | m4af_free(entry->u.name); | |
1163 | m4af_free(entry->data); | |
1164 | } | |
1165 | m4af_free(ctx->itmf_table); | |
1166 | } | |
1167 | ||
1168 | void m4af_teardown(m4af_writer_t **ctxp) | |
1169 | { | |
1170 | unsigned i; | |
1171 | m4af_writer_t *ctx = *ctxp; | |
1172 | m4af_track_t *track; | |
1173 | for (i = 0; i < ctx->num_tracks; ++i) { | |
1174 | track = ctx->track + i; | |
1175 | if (track->decSpecificInfo) | |
1176 | m4af_free(track->decSpecificInfo); | |
1177 | if (track->sample_table) | |
1178 | m4af_free(track->sample_table); | |
1179 | if (track->chunk_table) | |
1180 | m4af_free(track->chunk_table); | |
1181 | if (track->chunk_buffer) | |
1182 | m4af_free(track->chunk_buffer); | |
1183 | } | |
1184 | if (ctx->itmf_table) | |
1185 | m4af_free_itmf_table(ctx); | |
1186 | m4af_free(ctx); | |
1187 | *ctxp = 0; | |
1188 | } |