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