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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 <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 }
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