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| 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 | 1x 28x 28x 28x 28x 28x 28x 28x 28x 28x | /* * Buffer Controller */ import Event from '../events'; import EventHandler from '../event-handler'; import { logger } from '../utils/logger'; import { ErrorTypes, ErrorDetails } from '../errors'; import { getMediaSource } from '../helper/mediasource-helper'; const MediaSource = getMediaSource(); class BufferController extends EventHandler { constructor (hls) { super(hls, Event.MEDIA_ATTACHING, Event.MEDIA_DETACHING, Event.MANIFEST_PARSED, Event.BUFFER_RESET, Event.BUFFER_APPENDING, Event.BUFFER_CODECS, Event.BUFFER_EOS, Event.BUFFER_FLUSHING, Event.LEVEL_PTS_UPDATED, Event.LEVEL_UPDATED); // the value that we have set mediasource.duration to // (the actual duration may be tweaked slighly by the browser) this._msDuration = null; // the value that we want to set mediaSource.duration to this._levelDuration = null; // current stream state: true - for live broadcast, false - for VoD content this._live = null; // cache the self generated object url to detect hijack of video tag this._objectUrl = null; // Source Buffer listeners this.onsbue = this.onSBUpdateEnd.bind(this); this.onsbe = this.onSBUpdateError.bind(this); this.pendingTracks = {}; this.tracks = {}; } destroy () { EventHandler.prototype.destroy.call(this); } onLevelPtsUpdated (data) { let type = data.type; let audioTrack = this.tracks.audio; // Adjusting `SourceBuffer.timestampOffset` (desired point in the timeline where the next frames should be appended) // in Chrome browser when we detect MPEG audio container and time delta between level PTS and `SourceBuffer.timestampOffset` // is greater than 100ms (this is enough to handle seek for VOD or level change for LIVE videos). At the time of change we issue // `SourceBuffer.abort()` and adjusting `SourceBuffer.timestampOffset` if `SourceBuffer.updating` is false or awaiting `updateend` // event if SB is in updating state. // More info here: https://github.com/video-dev/hls.js/issues/332#issuecomment-257986486 if (type === 'audio' && audioTrack && audioTrack.container === 'audio/mpeg') { // Chrome audio mp3 track let audioBuffer = this.sourceBuffer.audio; let delta = Math.abs(audioBuffer.timestampOffset - data.start); // adjust timestamp offset if time delta is greater than 100ms if (delta > 0.1) { let updating = audioBuffer.updating; try { audioBuffer.abort(); } catch (err) { updating = true; logger.warn('can not abort audio buffer: ' + err); } if (!updating) { logger.warn('change mpeg audio timestamp offset from ' + audioBuffer.timestampOffset + ' to ' + data.start); audioBuffer.timestampOffset = data.start; } else { this.audioTimestampOffset = data.start; } } } } onManifestParsed (data) { let audioExpected = data.audio, videoExpected = data.video || (data.levels.length && data.audio), sourceBufferNb = 0; // in case of alt audio 2 BUFFER_CODECS events will be triggered, one per stream controller // sourcebuffers will be created all at once when the expected nb of tracks will be reached // in case alt audio is not used, only one BUFFER_CODEC event will be fired from main stream controller // it will contain the expected nb of source buffers, no need to compute it if (data.altAudio && (audioExpected || videoExpected)) { sourceBufferNb = (audioExpected ? 1 : 0) + (videoExpected ? 1 : 0); logger.log(`${sourceBufferNb} sourceBuffer(s) expected`); } this.sourceBufferNb = sourceBufferNb; } onMediaAttaching (data) { let media = this.media = data.media; if (media) { // setup the media source let ms = this.mediaSource = new MediaSource(); // Media Source listeners this.onmso = this.onMediaSourceOpen.bind(this); this.onmse = this.onMediaSourceEnded.bind(this); this.onmsc = this.onMediaSourceClose.bind(this); ms.addEventListener('sourceopen', this.onmso); ms.addEventListener('sourceended', this.onmse); ms.addEventListener('sourceclose', this.onmsc); // link video and media Source media.src = URL.createObjectURL(ms); // cache the locally generated object url this._objectUrl = media.src; } } onMediaDetaching () { logger.log('media source detaching'); let ms = this.mediaSource; if (ms) { if (ms.readyState === 'open') { try { // endOfStream could trigger exception if any sourcebuffer is in updating state // we don't really care about checking sourcebuffer state here, // as we are anyway detaching the MediaSource // let's just avoid this exception to propagate ms.endOfStream(); } catch (err) { logger.warn(`onMediaDetaching:${err.message} while calling endOfStream`); } } ms.removeEventListener('sourceopen', this.onmso); ms.removeEventListener('sourceended', this.onmse); ms.removeEventListener('sourceclose', this.onmsc); // Detach properly the MediaSource from the HTMLMediaElement as // suggested in https://github.com/w3c/media-source/issues/53. if (this.media) { URL.revokeObjectURL(this._objectUrl); // clean up video tag src only if it's our own url. some external libraries might // hijack the video tag and change its 'src' without destroying the Hls instance first if (this.media.src === this._objectUrl) { this.media.removeAttribute('src'); this.media.load(); } else { logger.warn('media.src was changed by a third party - skip cleanup'); } } this.mediaSource = null; this.media = null; this._objectUrl = null; this.pendingTracks = {}; this.tracks = {}; this.sourceBuffer = {}; this.flushRange = []; this.segments = []; this.appended = 0; } this.onmso = this.onmse = this.onmsc = null; this.hls.trigger(Event.MEDIA_DETACHED); } onMediaSourceOpen () { logger.log('media source opened'); this.hls.trigger(Event.MEDIA_ATTACHED, { media: this.media }); let mediaSource = this.mediaSource; if (mediaSource) { // once received, don't listen anymore to sourceopen event mediaSource.removeEventListener('sourceopen', this.onmso); } this.checkPendingTracks(); } checkPendingTracks () { // if any buffer codecs pending, check if we have enough to create sourceBuffers let pendingTracks = this.pendingTracks, pendingTracksNb = Object.keys(pendingTracks).length; // if any pending tracks and (if nb of pending tracks gt or equal than expected nb or if unknown expected nb) if (pendingTracksNb && ( this.sourceBufferNb <= pendingTracksNb || this.sourceBufferNb === 0)) { // ok, let's create them now ! this.createSourceBuffers(pendingTracks); this.pendingTracks = {}; // append any pending segments now ! this.doAppending(); } } onMediaSourceClose () { logger.log('media source closed'); } onMediaSourceEnded () { logger.log('media source ended'); } onSBUpdateEnd () { // update timestampOffset if (this.audioTimestampOffset) { let audioBuffer = this.sourceBuffer.audio; logger.warn('change mpeg audio timestamp offset from ' + audioBuffer.timestampOffset + ' to ' + this.audioTimestampOffset); audioBuffer.timestampOffset = this.audioTimestampOffset; delete this.audioTimestampOffset; } if (this._needsFlush) this.doFlush(); if (this._needsEos) this.checkEos(); this.appending = false; let parent = this.parent; // count nb of pending segments waiting for appending on this sourcebuffer let pending = this.segments.reduce((counter, segment) => (segment.parent === parent) ? counter + 1 : counter, 0); // this.sourceBuffer is better to use than media.buffered as it is closer to the PTS data from the fragments let timeRanges = {}; const sourceBuffer = this.sourceBuffer; for (let streamType in sourceBuffer) timeRanges[streamType] = sourceBuffer[streamType].buffered; this.hls.trigger(Event.BUFFER_APPENDED, { parent, pending, timeRanges }); // don't append in flushing mode if (!this._needsFlush) this.doAppending(); this.updateMediaElementDuration(); } onSBUpdateError (event) { logger.error('sourceBuffer error:', event); // according to http://www.w3.org/TR/media-source/#sourcebuffer-append-error // this error might not always be fatal (it is fatal if decode error is set, in that case // it will be followed by a mediaElement error ...) this.hls.trigger(Event.ERROR, { type: ErrorTypes.MEDIA_ERROR, details: ErrorDetails.BUFFER_APPENDING_ERROR, fatal: false }); // we don't need to do more than that, as accordin to the spec, updateend will be fired just after } onBufferReset () { let sourceBuffer = this.sourceBuffer; for (let type in sourceBuffer) { let sb = sourceBuffer[type]; try { this.mediaSource.removeSourceBuffer(sb); sb.removeEventListener('updateend', this.onsbue); sb.removeEventListener('error', this.onsbe); } catch (err) { } } this.sourceBuffer = {}; this.flushRange = []; this.segments = []; this.appended = 0; } onBufferCodecs (tracks) { // if source buffer(s) not created yet, appended buffer tracks in this.pendingTracks // if sourcebuffers already created, do nothing ... if (Object.keys(this.sourceBuffer).length === 0) { for (let trackName in tracks) this.pendingTracks[trackName] = tracks[trackName]; let mediaSource = this.mediaSource; if (mediaSource && mediaSource.readyState === 'open') { // try to create sourcebuffers if mediasource opened this.checkPendingTracks(); } } } createSourceBuffers (tracks) { let sourceBuffer = this.sourceBuffer, mediaSource = this.mediaSource; for (let trackName in tracks) { if (!sourceBuffer[trackName]) { let track = tracks[trackName]; // use levelCodec as first priority let codec = track.levelCodec || track.codec; let mimeType = `${track.container};codecs=${codec}`; logger.log(`creating sourceBuffer(${mimeType})`); try { let sb = sourceBuffer[trackName] = mediaSource.addSourceBuffer(mimeType); sb.addEventListener('updateend', this.onsbue); sb.addEventListener('error', this.onsbe); this.tracks[trackName] = { codec: codec, container: track.container }; track.buffer = sb; } catch (err) { logger.error(`error while trying to add sourceBuffer:${err.message}`); this.hls.trigger(Event.ERROR, { type: ErrorTypes.MEDIA_ERROR, details: ErrorDetails.BUFFER_ADD_CODEC_ERROR, fatal: false, err: err, mimeType: mimeType }); } } } this.hls.trigger(Event.BUFFER_CREATED, { tracks: tracks }); } onBufferAppending (data) { if (!this._needsFlush) { if (!this.segments) this.segments = [ data ]; else this.segments.push(data); this.doAppending(); } } onBufferAppendFail (data) { logger.error('sourceBuffer error:', data.event); // according to http://www.w3.org/TR/media-source/#sourcebuffer-append-error // this error might not always be fatal (it is fatal if decode error is set, in that case // it will be followed by a mediaElement error ...) this.hls.trigger(Event.ERROR, { type: ErrorTypes.MEDIA_ERROR, details: ErrorDetails.BUFFER_APPENDING_ERROR, fatal: false }); } // on BUFFER_EOS mark matching sourcebuffer(s) as ended and trigger checkEos() onBufferEos (data) { let sb = this.sourceBuffer; let dataType = data.type; for (let type in sb) { if (!dataType || type === dataType) { if (!sb[type].ended) { sb[type].ended = true; logger.log(`${type} sourceBuffer now EOS`); } } } this.checkEos(); } // if all source buffers are marked as ended, signal endOfStream() to MediaSource. checkEos () { let sb = this.sourceBuffer, mediaSource = this.mediaSource; if (!mediaSource || mediaSource.readyState !== 'open') { this._needsEos = false; return; } for (let type in sb) { let sbobj = sb[type]; if (!sbobj.ended) return; if (sbobj.updating) { this._needsEos = true; return; } } logger.log('all media data available, signal endOfStream() to MediaSource and stop loading fragment'); // Notify the media element that it now has all of the media data try { mediaSource.endOfStream(); } catch (e) { logger.warn('exception while calling mediaSource.endOfStream()'); } this._needsEos = false; } onBufferFlushing (data) { this.flushRange.push({ start: data.startOffset, end: data.endOffset, type: data.type }); // attempt flush immediately this.flushBufferCounter = 0; this.doFlush(); } onLevelUpdated ({ details }) { if (details.fragments.length > 0) { this._levelDuration = details.totalduration + details.fragments[0].start; this._live = details.live; this.updateMediaElementDuration(); } } /** * Update Media Source duration to current level duration or override to Infinity if configuration parameter * 'liveDurationInfinity` is set to `true` * More details: https://github.com/video-dev/hls.js/issues/355 */ updateMediaElementDuration () { let { config } = this.hls; let duration; if (this._levelDuration === null || !this.media || !this.mediaSource || !this.sourceBuffer || this.media.readyState === 0 || this.mediaSource.readyState !== 'open') return; for (let type in this.sourceBuffer) { if (this.sourceBuffer[type].updating === true) { // can't set duration whilst a buffer is updating return; } } duration = this.media.duration; // initialise to the value that the media source is reporting if (this._msDuration === null) this._msDuration = this.mediaSource.duration; if (this._live === true && config.liveDurationInfinity === true) { // Override duration to Infinity logger.log('Media Source duration is set to Infinity'); this._msDuration = this.mediaSource.duration = Infinity; } else if ((this._levelDuration > this._msDuration && this._levelDuration > duration) || (duration === Infinity || isNaN(duration))) { // levelDuration was the last value we set. // not using mediaSource.duration as the browser may tweak this value // only update Media Source duration if its value increase, this is to avoid // flushing already buffered portion when switching between quality level logger.log(`Updating Media Source duration to ${this._levelDuration.toFixed(3)}`); this._msDuration = this.mediaSource.duration = this._levelDuration; } } doFlush () { // loop through all buffer ranges to flush while (this.flushRange.length) { let range = this.flushRange[0]; // flushBuffer will abort any buffer append in progress and flush Audio/Video Buffer if (this.flushBuffer(range.start, range.end, range.type)) { // range flushed, remove from flush array this.flushRange.shift(); this.flushBufferCounter = 0; } else { this._needsFlush = true; // avoid looping, wait for SB update end to retrigger a flush return; } } if (this.flushRange.length === 0) { // everything flushed this._needsFlush = false; // let's recompute this.appended, which is used to avoid flush looping let appended = 0; let sourceBuffer = this.sourceBuffer; try { for (let type in sourceBuffer) appended += sourceBuffer[type].buffered.length; } catch (error) { // error could be thrown while accessing buffered, in case sourcebuffer has already been removed from MediaSource // this is harmess at this stage, catch this to avoid reporting an internal exception logger.error('error while accessing sourceBuffer.buffered'); } this.appended = appended; this.hls.trigger(Event.BUFFER_FLUSHED); } } doAppending () { let hls = this.hls, sourceBuffer = this.sourceBuffer, segments = this.segments; if (Object.keys(sourceBuffer).length) { if (this.media.error) { this.segments = []; logger.error('trying to append although a media error occured, flush segment and abort'); return; } if (this.appending) { // logger.log(`sb appending in progress`); return; } if (segments && segments.length) { let segment = segments.shift(); try { let type = segment.type, sb = sourceBuffer[type]; if (sb) { if (!sb.updating) { // reset sourceBuffer ended flag before appending segment sb.ended = false; // logger.log(`appending ${segment.content} ${type} SB, size:${segment.data.length}, ${segment.parent}`); this.parent = segment.parent; sb.appendBuffer(segment.data); this.appendError = 0; this.appended++; this.appending = true; } else { segments.unshift(segment); } } else { // in case we don't have any source buffer matching with this segment type, // it means that Mediasource fails to create sourcebuffer // discard this segment, and trigger update end this.onSBUpdateEnd(); } } catch (err) { // in case any error occured while appending, put back segment in segments table logger.error(`error while trying to append buffer:${err.message}`); segments.unshift(segment); let event = { type: ErrorTypes.MEDIA_ERROR, parent: segment.parent }; if (err.code !== 22) { if (this.appendError) this.appendError++; else this.appendError = 1; event.details = ErrorDetails.BUFFER_APPEND_ERROR; /* with UHD content, we could get loop of quota exceeded error until browser is able to evict some data from sourcebuffer. retrying help recovering this */ if (this.appendError > hls.config.appendErrorMaxRetry) { logger.log(`fail ${hls.config.appendErrorMaxRetry} times to append segment in sourceBuffer`); segments = []; event.fatal = true; hls.trigger(Event.ERROR, event); } else { event.fatal = false; hls.trigger(Event.ERROR, event); } } else { // QuotaExceededError: http://www.w3.org/TR/html5/infrastructure.html#quotaexceedederror // let's stop appending any segments, and report BUFFER_FULL_ERROR error this.segments = []; event.details = ErrorDetails.BUFFER_FULL_ERROR; event.fatal = false; hls.trigger(Event.ERROR, event); } } } } } /* flush specified buffered range, return true once range has been flushed. as sourceBuffer.remove() is asynchronous, flushBuffer will be retriggered on sourceBuffer update end */ flushBuffer (startOffset, endOffset, typeIn) { let sb, i, bufStart, bufEnd, flushStart, flushEnd, sourceBuffer = this.sourceBuffer; if (Object.keys(sourceBuffer).length) { logger.log(`flushBuffer,pos/start/end: ${this.media.currentTime.toFixed(3)}/${startOffset}/${endOffset}`); // safeguard to avoid infinite looping : don't try to flush more than the nb of appended segments if (this.flushBufferCounter < this.appended) { for (let type in sourceBuffer) { // check if sourcebuffer type is defined (typeIn): if yes, let's only flush this one // if no, let's flush all sourcebuffers if (typeIn && type !== typeIn) continue; sb = sourceBuffer[type]; // we are going to flush buffer, mark source buffer as 'not ended' sb.ended = false; if (!sb.updating) { try { for (i = 0; i < sb.buffered.length; i++) { bufStart = sb.buffered.start(i); bufEnd = sb.buffered.end(i); // workaround firefox not able to properly flush multiple buffered range. if (navigator.userAgent.toLowerCase().indexOf('firefox') !== -1 && endOffset === Number.POSITIVE_INFINITY) { flushStart = startOffset; flushEnd = endOffset; } else { flushStart = Math.max(bufStart, startOffset); flushEnd = Math.min(bufEnd, endOffset); } /* sometimes sourcebuffer.remove() does not flush the exact expected time range. to avoid rounding issues/infinite loop, only flush buffer range of length greater than 500ms. */ if (Math.min(flushEnd, bufEnd) - flushStart > 0.5) { this.flushBufferCounter++; logger.log(`flush ${type} [${flushStart},${flushEnd}], of [${bufStart},${bufEnd}], pos:${this.media.currentTime}`); sb.remove(flushStart, flushEnd); return false; } } } catch (e) { logger.warn('exception while accessing sourcebuffer, it might have been removed from MediaSource'); } } else { // logger.log('abort ' + type + ' append in progress'); // this will abort any appending in progress // sb.abort(); logger.warn('cannot flush, sb updating in progress'); return false; } } } else { logger.warn('abort flushing too many retries'); } logger.log('buffer flushed'); } // everything flushed ! return true; } } export default BufferController; |