Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 | 1x | /**
* Generate MP4 Box
*/
// import Hex from '../utils/hex';
const UINT32_MAX = Math.pow(2, 32) - 1;
class MP4 {
static init () {
MP4.types = {
avc1: [], // codingname
avcC: [],
btrt: [],
dinf: [],
dref: [],
esds: [],
ftyp: [],
hdlr: [],
mdat: [],
mdhd: [],
mdia: [],
mfhd: [],
minf: [],
moof: [],
moov: [],
mp4a: [],
'.mp3': [],
mvex: [],
mvhd: [],
pasp: [],
sdtp: [],
stbl: [],
stco: [],
stsc: [],
stsd: [],
stsz: [],
stts: [],
tfdt: [],
tfhd: [],
traf: [],
trak: [],
trun: [],
trex: [],
tkhd: [],
vmhd: [],
smhd: []
};
let i;
for (i in MP4.types) {
if (MP4.types.hasOwnProperty(i)) {
MP4.types[i] = [
i.charCodeAt(0),
i.charCodeAt(1),
i.charCodeAt(2),
i.charCodeAt(3)
];
}
}
let videoHdlr = new Uint8Array([
0x00, // version 0
0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x00, // pre_defined
0x76, 0x69, 0x64, 0x65, // handler_type: 'vide'
0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, // reserved
0x56, 0x69, 0x64, 0x65,
0x6f, 0x48, 0x61, 0x6e,
0x64, 0x6c, 0x65, 0x72, 0x00 // name: 'VideoHandler'
]);
let audioHdlr = new Uint8Array([
0x00, // version 0
0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x00, // pre_defined
0x73, 0x6f, 0x75, 0x6e, // handler_type: 'soun'
0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, // reserved
0x53, 0x6f, 0x75, 0x6e,
0x64, 0x48, 0x61, 0x6e,
0x64, 0x6c, 0x65, 0x72, 0x00 // name: 'SoundHandler'
]);
MP4.HDLR_TYPES = {
'video': videoHdlr,
'audio': audioHdlr
};
let dref = new Uint8Array([
0x00, // version 0
0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x01, // entry_count
0x00, 0x00, 0x00, 0x0c, // entry_size
0x75, 0x72, 0x6c, 0x20, // 'url' type
0x00, // version 0
0x00, 0x00, 0x01 // entry_flags
]);
let stco = new Uint8Array([
0x00, // version
0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x00 // entry_count
]);
MP4.STTS = MP4.STSC = MP4.STCO = stco;
MP4.STSZ = new Uint8Array([
0x00, // version
0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x00, // sample_size
0x00, 0x00, 0x00, 0x00 // sample_count
]);
MP4.VMHD = new Uint8Array([
0x00, // version
0x00, 0x00, 0x01, // flags
0x00, 0x00, // graphicsmode
0x00, 0x00,
0x00, 0x00,
0x00, 0x00 // opcolor
]);
MP4.SMHD = new Uint8Array([
0x00, // version
0x00, 0x00, 0x00, // flags
0x00, 0x00, // balance
0x00, 0x00 // reserved
]);
MP4.STSD = new Uint8Array([
0x00, // version 0
0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x01]);// entry_count
let majorBrand = new Uint8Array([105, 115, 111, 109]); // isom
let avc1Brand = new Uint8Array([97, 118, 99, 49]); // avc1
let minorVersion = new Uint8Array([0, 0, 0, 1]);
MP4.FTYP = MP4.box(MP4.types.ftyp, majorBrand, minorVersion, majorBrand, avc1Brand);
MP4.DINF = MP4.box(MP4.types.dinf, MP4.box(MP4.types.dref, dref));
}
static box (type) {
let
payload = Array.prototype.slice.call(arguments, 1),
size = 8,
i = payload.length,
len = i,
result;
// calculate the total size we need to allocate
while (i--)
size += payload[i].byteLength;
result = new Uint8Array(size);
result[0] = (size >> 24) & 0xff;
result[1] = (size >> 16) & 0xff;
result[2] = (size >> 8) & 0xff;
result[3] = size & 0xff;
result.set(type, 4);
// copy the payload into the result
for (i = 0, size = 8; i < len; i++) {
// copy payload[i] array @ offset size
result.set(payload[i], size);
size += payload[i].byteLength;
}
return result;
}
static hdlr (type) {
return MP4.box(MP4.types.hdlr, MP4.HDLR_TYPES[type]);
}
static mdat (data) {
return MP4.box(MP4.types.mdat, data);
}
static mdhd (timescale, duration) {
duration *= timescale;
const upperWordDuration = Math.floor(duration / (UINT32_MAX + 1));
const lowerWordDuration = Math.floor(duration % (UINT32_MAX + 1));
return MP4.box(MP4.types.mdhd, new Uint8Array([
0x01, // version 1
0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, // creation_time
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, // modification_time
(timescale >> 24) & 0xFF,
(timescale >> 16) & 0xFF,
(timescale >> 8) & 0xFF,
timescale & 0xFF, // timescale
(upperWordDuration >> 24),
(upperWordDuration >> 16) & 0xFF,
(upperWordDuration >> 8) & 0xFF,
upperWordDuration & 0xFF,
(lowerWordDuration >> 24),
(lowerWordDuration >> 16) & 0xFF,
(lowerWordDuration >> 8) & 0xFF,
lowerWordDuration & 0xFF,
0x55, 0xc4, // 'und' language (undetermined)
0x00, 0x00
]));
}
static mdia (track) {
return MP4.box(MP4.types.mdia, MP4.mdhd(track.timescale, track.duration), MP4.hdlr(track.type), MP4.minf(track));
}
static mfhd (sequenceNumber) {
return MP4.box(MP4.types.mfhd, new Uint8Array([
0x00,
0x00, 0x00, 0x00, // flags
(sequenceNumber >> 24),
(sequenceNumber >> 16) & 0xFF,
(sequenceNumber >> 8) & 0xFF,
sequenceNumber & 0xFF // sequence_number
]));
}
static minf (track) {
if (track.type === 'audio')
return MP4.box(MP4.types.minf, MP4.box(MP4.types.smhd, MP4.SMHD), MP4.DINF, MP4.stbl(track));
else
return MP4.box(MP4.types.minf, MP4.box(MP4.types.vmhd, MP4.VMHD), MP4.DINF, MP4.stbl(track));
}
static moof (sn, baseMediaDecodeTime, track) {
return MP4.box(MP4.types.moof, MP4.mfhd(sn), MP4.traf(track, baseMediaDecodeTime));
}
/**
* @param tracks... (optional) {array} the tracks associated with this movie
*/
static moov (tracks) {
let
i = tracks.length,
boxes = [];
while (i--)
boxes[i] = MP4.trak(tracks[i]);
return MP4.box.apply(null, [MP4.types.moov, MP4.mvhd(tracks[0].timescale, tracks[0].duration)].concat(boxes).concat(MP4.mvex(tracks)));
}
static mvex (tracks) {
let
i = tracks.length,
boxes = [];
while (i--)
boxes[i] = MP4.trex(tracks[i]);
return MP4.box.apply(null, [MP4.types.mvex].concat(boxes));
}
static mvhd (timescale, duration) {
duration *= timescale;
const upperWordDuration = Math.floor(duration / (UINT32_MAX + 1));
const lowerWordDuration = Math.floor(duration % (UINT32_MAX + 1));
let
bytes = new Uint8Array([
0x01, // version 1
0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, // creation_time
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, // modification_time
(timescale >> 24) & 0xFF,
(timescale >> 16) & 0xFF,
(timescale >> 8) & 0xFF,
timescale & 0xFF, // timescale
(upperWordDuration >> 24),
(upperWordDuration >> 16) & 0xFF,
(upperWordDuration >> 8) & 0xFF,
upperWordDuration & 0xFF,
(lowerWordDuration >> 24),
(lowerWordDuration >> 16) & 0xFF,
(lowerWordDuration >> 8) & 0xFF,
lowerWordDuration & 0xFF,
0x00, 0x01, 0x00, 0x00, // 1.0 rate
0x01, 0x00, // 1.0 volume
0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x01, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x01, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x40, 0x00, 0x00, 0x00, // transformation: unity matrix
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, // pre_defined
0xff, 0xff, 0xff, 0xff // next_track_ID
]);
return MP4.box(MP4.types.mvhd, bytes);
}
static sdtp (track) {
let
samples = track.samples || [],
bytes = new Uint8Array(4 + samples.length),
flags,
i;
// leave the full box header (4 bytes) all zero
// write the sample table
for (i = 0; i < samples.length; i++) {
flags = samples[i].flags;
bytes[i + 4] = (flags.dependsOn << 4) |
(flags.isDependedOn << 2) |
(flags.hasRedundancy);
}
return MP4.box(MP4.types.sdtp, bytes);
}
static stbl (track) {
return MP4.box(MP4.types.stbl, MP4.stsd(track), MP4.box(MP4.types.stts, MP4.STTS), MP4.box(MP4.types.stsc, MP4.STSC), MP4.box(MP4.types.stsz, MP4.STSZ), MP4.box(MP4.types.stco, MP4.STCO));
}
static avc1 (track) {
let sps = [], pps = [], i, data, len;
// assemble the SPSs
for (i = 0; i < track.sps.length; i++) {
data = track.sps[i];
len = data.byteLength;
sps.push((len >>> 8) & 0xFF);
sps.push((len & 0xFF));
sps = sps.concat(Array.prototype.slice.call(data)); // SPS
}
// assemble the PPSs
for (i = 0; i < track.pps.length; i++) {
data = track.pps[i];
len = data.byteLength;
pps.push((len >>> 8) & 0xFF);
pps.push((len & 0xFF));
pps = pps.concat(Array.prototype.slice.call(data));
}
let avcc = MP4.box(MP4.types.avcC, new Uint8Array([
0x01, // version
sps[3], // profile
sps[4], // profile compat
sps[5], // level
0xfc | 3, // lengthSizeMinusOne, hard-coded to 4 bytes
0xE0 | track.sps.length // 3bit reserved (111) + numOfSequenceParameterSets
].concat(sps).concat([
track.pps.length // numOfPictureParameterSets
]).concat(pps))), // "PPS"
width = track.width,
height = track.height,
hSpacing = track.pixelRatio[0],
vSpacing = track.pixelRatio[1];
return MP4.box(MP4.types.avc1, new Uint8Array([
0x00, 0x00, 0x00, // reserved
0x00, 0x00, 0x00, // reserved
0x00, 0x01, // data_reference_index
0x00, 0x00, // pre_defined
0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, // pre_defined
(width >> 8) & 0xFF,
width & 0xff, // width
(height >> 8) & 0xFF,
height & 0xff, // height
0x00, 0x48, 0x00, 0x00, // horizresolution
0x00, 0x48, 0x00, 0x00, // vertresolution
0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x01, // frame_count
0x12,
0x64, 0x61, 0x69, 0x6C, // dailymotion/hls.js
0x79, 0x6D, 0x6F, 0x74,
0x69, 0x6F, 0x6E, 0x2F,
0x68, 0x6C, 0x73, 0x2E,
0x6A, 0x73, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, // compressorname
0x00, 0x18, // depth = 24
0x11, 0x11]), // pre_defined = -1
avcc,
MP4.box(MP4.types.btrt, new Uint8Array([
0x00, 0x1c, 0x9c, 0x80, // bufferSizeDB
0x00, 0x2d, 0xc6, 0xc0, // maxBitrate
0x00, 0x2d, 0xc6, 0xc0])), // avgBitrate
MP4.box(MP4.types.pasp, new Uint8Array([
(hSpacing >> 24), // hSpacing
(hSpacing >> 16) & 0xFF,
(hSpacing >> 8) & 0xFF,
hSpacing & 0xFF,
(vSpacing >> 24), // vSpacing
(vSpacing >> 16) & 0xFF,
(vSpacing >> 8) & 0xFF,
vSpacing & 0xFF]))
);
}
static esds (track) {
let configlen = track.config.length;
return new Uint8Array([
0x00, // version 0
0x00, 0x00, 0x00, // flags
0x03, // descriptor_type
0x17 + configlen, // length
0x00, 0x01, // es_id
0x00, // stream_priority
0x04, // descriptor_type
0x0f + configlen, // length
0x40, // codec : mpeg4_audio
0x15, // stream_type
0x00, 0x00, 0x00, // buffer_size
0x00, 0x00, 0x00, 0x00, // maxBitrate
0x00, 0x00, 0x00, 0x00, // avgBitrate
0x05 // descriptor_type
].concat([configlen]).concat(track.config).concat([0x06, 0x01, 0x02])); // GASpecificConfig)); // length + audio config descriptor
}
static mp4a (track) {
let samplerate = track.samplerate;
return MP4.box(MP4.types.mp4a, new Uint8Array([
0x00, 0x00, 0x00, // reserved
0x00, 0x00, 0x00, // reserved
0x00, 0x01, // data_reference_index
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, // reserved
0x00, track.channelCount, // channelcount
0x00, 0x10, // sampleSize:16bits
0x00, 0x00, 0x00, 0x00, // reserved2
(samplerate >> 8) & 0xFF,
samplerate & 0xff, //
0x00, 0x00]),
MP4.box(MP4.types.esds, MP4.esds(track)));
}
static mp3 (track) {
let samplerate = track.samplerate;
return MP4.box(MP4.types['.mp3'], new Uint8Array([
0x00, 0x00, 0x00, // reserved
0x00, 0x00, 0x00, // reserved
0x00, 0x01, // data_reference_index
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, // reserved
0x00, track.channelCount, // channelcount
0x00, 0x10, // sampleSize:16bits
0x00, 0x00, 0x00, 0x00, // reserved2
(samplerate >> 8) & 0xFF,
samplerate & 0xff, //
0x00, 0x00]));
}
static stsd (track) {
if (track.type === 'audio') {
if (!track.isAAC && track.codec === 'mp3')
return MP4.box(MP4.types.stsd, MP4.STSD, MP4.mp3(track));
return MP4.box(MP4.types.stsd, MP4.STSD, MP4.mp4a(track));
} else {
return MP4.box(MP4.types.stsd, MP4.STSD, MP4.avc1(track));
}
}
static tkhd (track) {
let id = track.id,
duration = track.duration * track.timescale,
width = track.width,
height = track.height,
upperWordDuration = Math.floor(duration / (UINT32_MAX + 1)),
lowerWordDuration = Math.floor(duration % (UINT32_MAX + 1));
return MP4.box(MP4.types.tkhd, new Uint8Array([
0x01, // version 1
0x00, 0x00, 0x07, // flags
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, // creation_time
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, // modification_time
(id >> 24) & 0xFF,
(id >> 16) & 0xFF,
(id >> 8) & 0xFF,
id & 0xFF, // track_ID
0x00, 0x00, 0x00, 0x00, // reserved
(upperWordDuration >> 24),
(upperWordDuration >> 16) & 0xFF,
(upperWordDuration >> 8) & 0xFF,
upperWordDuration & 0xFF,
(lowerWordDuration >> 24),
(lowerWordDuration >> 16) & 0xFF,
(lowerWordDuration >> 8) & 0xFF,
lowerWordDuration & 0xFF,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x00, // layer
0x00, 0x00, // alternate_group
0x00, 0x00, // non-audio track volume
0x00, 0x00, // reserved
0x00, 0x01, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x01, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x40, 0x00, 0x00, 0x00, // transformation: unity matrix
(width >> 8) & 0xFF,
width & 0xFF,
0x00, 0x00, // width
(height >> 8) & 0xFF,
height & 0xFF,
0x00, 0x00 // height
]));
}
static traf (track, baseMediaDecodeTime) {
let sampleDependencyTable = MP4.sdtp(track),
id = track.id,
upperWordBaseMediaDecodeTime = Math.floor(baseMediaDecodeTime / (UINT32_MAX + 1)),
lowerWordBaseMediaDecodeTime = Math.floor(baseMediaDecodeTime % (UINT32_MAX + 1));
return MP4.box(MP4.types.traf,
MP4.box(MP4.types.tfhd, new Uint8Array([
0x00, // version 0
0x00, 0x00, 0x00, // flags
(id >> 24),
(id >> 16) & 0XFF,
(id >> 8) & 0XFF,
(id & 0xFF) // track_ID
])),
MP4.box(MP4.types.tfdt, new Uint8Array([
0x01, // version 1
0x00, 0x00, 0x00, // flags
(upperWordBaseMediaDecodeTime >> 24),
(upperWordBaseMediaDecodeTime >> 16) & 0XFF,
(upperWordBaseMediaDecodeTime >> 8) & 0XFF,
(upperWordBaseMediaDecodeTime & 0xFF),
(lowerWordBaseMediaDecodeTime >> 24),
(lowerWordBaseMediaDecodeTime >> 16) & 0XFF,
(lowerWordBaseMediaDecodeTime >> 8) & 0XFF,
(lowerWordBaseMediaDecodeTime & 0xFF)
])),
MP4.trun(track,
sampleDependencyTable.length +
16 + // tfhd
20 + // tfdt
8 + // traf header
16 + // mfhd
8 + // moof header
8), // mdat header
sampleDependencyTable);
}
/**
* Generate a track box.
* @param track {object} a track definition
* @return {Uint8Array} the track box
*/
static trak (track) {
track.duration = track.duration || 0xffffffff;
return MP4.box(MP4.types.trak, MP4.tkhd(track), MP4.mdia(track));
}
static trex (track) {
let id = track.id;
return MP4.box(MP4.types.trex, new Uint8Array([
0x00, // version 0
0x00, 0x00, 0x00, // flags
(id >> 24),
(id >> 16) & 0XFF,
(id >> 8) & 0XFF,
(id & 0xFF), // track_ID
0x00, 0x00, 0x00, 0x01, // default_sample_description_index
0x00, 0x00, 0x00, 0x00, // default_sample_duration
0x00, 0x00, 0x00, 0x00, // default_sample_size
0x00, 0x01, 0x00, 0x01 // default_sample_flags
]));
}
static trun (track, offset) {
let samples = track.samples || [],
len = samples.length,
arraylen = 12 + (16 * len),
array = new Uint8Array(arraylen),
i, sample, duration, size, flags, cts;
offset += 8 + arraylen;
array.set([
0x00, // version 0
0x00, 0x0f, 0x01, // flags
(len >>> 24) & 0xFF,
(len >>> 16) & 0xFF,
(len >>> 8) & 0xFF,
len & 0xFF, // sample_count
(offset >>> 24) & 0xFF,
(offset >>> 16) & 0xFF,
(offset >>> 8) & 0xFF,
offset & 0xFF // data_offset
], 0);
for (i = 0; i < len; i++) {
sample = samples[i];
duration = sample.duration;
size = sample.size;
flags = sample.flags;
cts = sample.cts;
array.set([
(duration >>> 24) & 0xFF,
(duration >>> 16) & 0xFF,
(duration >>> 8) & 0xFF,
duration & 0xFF, // sample_duration
(size >>> 24) & 0xFF,
(size >>> 16) & 0xFF,
(size >>> 8) & 0xFF,
size & 0xFF, // sample_size
(flags.isLeading << 2) | flags.dependsOn,
(flags.isDependedOn << 6) |
(flags.hasRedundancy << 4) |
(flags.paddingValue << 1) |
flags.isNonSync,
flags.degradPrio & 0xF0 << 8,
flags.degradPrio & 0x0F, // sample_flags
(cts >>> 24) & 0xFF,
(cts >>> 16) & 0xFF,
(cts >>> 8) & 0xFF,
cts & 0xFF // sample_composition_time_offset
], 12 + 16 * i);
}
return MP4.box(MP4.types.trun, array);
}
static initSegment (tracks) {
if (!MP4.types)
MP4.init();
let movie = MP4.moov(tracks), result;
result = new Uint8Array(MP4.FTYP.byteLength + movie.byteLength);
result.set(MP4.FTYP);
result.set(movie, MP4.FTYP.byteLength);
return result;
}
}
export default MP4;
|