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* Audio Stream Controller
*/
import BinarySearch from '../utils/binary-search';
import BufferHelper from '../helper/buffer-helper';
import Demuxer from '../demux/demuxer';
import Event from '../events';
import * as LevelHelper from '../helper/level-helper';
import TimeRanges from '../utils/time-ranges';
import { ErrorTypes, ErrorDetails } from '../errors';
import { logger } from '../utils/logger';
import { findFragWithCC } from '../utils/discontinuities';
import TaskLoop from '../task-loop';
import { FragmentState } from '../helper/fragment-tracker';
import Fragment from '../loader/fragment';
const State = {
STOPPED: 'STOPPED',
STARTING: 'STARTING',
IDLE: 'IDLE',
PAUSED: 'PAUSED',
KEY_LOADING: 'KEY_LOADING',
FRAG_LOADING: 'FRAG_LOADING',
FRAG_LOADING_WAITING_RETRY: 'FRAG_LOADING_WAITING_RETRY',
WAITING_TRACK: 'WAITING_TRACK',
PARSING: 'PARSING',
PARSED: 'PARSED',
BUFFER_FLUSHING: 'BUFFER_FLUSHING',
ENDED: 'ENDED',
ERROR: 'ERROR',
WAITING_INIT_PTS: 'WAITING_INIT_PTS'
};
class AudioStreamController extends TaskLoop {
constructor (hls, fragmentTracker) {
super(hls,
Event.MEDIA_ATTACHED,
Event.MEDIA_DETACHING,
Event.AUDIO_TRACKS_UPDATED,
Event.AUDIO_TRACK_SWITCHING,
Event.AUDIO_TRACK_LOADED,
Event.KEY_LOADED,
Event.FRAG_LOADED,
Event.FRAG_PARSING_INIT_SEGMENT,
Event.FRAG_PARSING_DATA,
Event.FRAG_PARSED,
Event.ERROR,
Event.BUFFER_RESET,
Event.BUFFER_CREATED,
Event.BUFFER_APPENDED,
Event.BUFFER_FLUSHED,
Event.INIT_PTS_FOUND);
this.fragmentTracker = fragmentTracker;
this.config = hls.config;
this.audioCodecSwap = false;
this._state = State.STOPPED;
this.initPTS = [];
this.waitingFragment = null;
this.videoTrackCC = null;
}
onHandlerDestroying () {
this.stopLoad();
}
onHandlerDestroyed () {
this.state = State.STOPPED;
this.fragmentTracker = null;
}
// Signal that video PTS was found
onInitPtsFound (data) {
let demuxerId = data.id, cc = data.frag.cc, initPTS = data.initPTS;
if (demuxerId === 'main') {
// Always update the new INIT PTS
// Can change due level switch
this.initPTS[cc] = initPTS;
this.videoTrackCC = cc;
logger.log(`InitPTS for cc: ${cc} found from video track: ${initPTS}`);
// If we are waiting we need to demux/remux the waiting frag
// With the new initPTS
if (this.state === State.WAITING_INIT_PTS)
this.tick();
}
}
startLoad (startPosition) {
Iif (this.tracks) {
let lastCurrentTime = this.lastCurrentTime;
this.stopLoad();
this.setInterval(100);
this.fragLoadError = 0;
if (lastCurrentTime > 0 && startPosition === -1) {
logger.log(`audio:override startPosition with lastCurrentTime @${lastCurrentTime.toFixed(3)}`);
this.state = State.IDLE;
} else {
this.lastCurrentTime = this.startPosition ? this.startPosition : startPosition;
this.state = State.STARTING;
}
this.nextLoadPosition = this.startPosition = this.lastCurrentTime;
this.tick();
} else {
this.startPosition = startPosition;
this.state = State.STOPPED;
}
}
stopLoad () {
let frag = this.fragCurrent;
if (frag) {
if (frag.loader)
frag.loader.abort();
this.fragmentTracker.removeFragment(frag);
this.fragCurrent = null;
}
this.fragPrevious = null;
if (this.demuxer) {
this.demuxer.destroy();
this.demuxer = null;
}
this.state = State.STOPPED;
}
set state (nextState) {
Iif (this.state !== nextState) {
const previousState = this.state;
this._state = nextState;
logger.log(`audio stream:${previousState}->${nextState}`);
}
}
get state () {
return this._state;
}
doTick () {
let pos, track, trackDetails, hls = this.hls, config = hls.config;
// logger.log('audioStream:' + this.state);
switch (this.state) {
case State.ERROR:
// don't do anything in error state to avoid breaking further ...
case State.PAUSED:
// don't do anything in paused state either ...
case State.BUFFER_FLUSHING:
break;
case State.STARTING:
this.state = State.WAITING_TRACK;
this.loadedmetadata = false;
break;
case State.IDLE:
const tracks = this.tracks;
// audio tracks not received => exit loop
if (!tracks)
break;
// if video not attached AND
// start fragment already requested OR start frag prefetch disable
// exit loop
// => if media not attached but start frag prefetch is enabled and start frag not requested yet, we will not exit loop
if (!this.media &&
(this.startFragRequested || !config.startFragPrefetch))
break;
// determine next candidate fragment to be loaded, based on current position and
// end of buffer position
// if we have not yet loaded any fragment, start loading from start position
if (this.loadedmetadata) {
pos = this.media.currentTime;
} else {
pos = this.nextLoadPosition;
if (pos === undefined)
break;
}
let media = this.mediaBuffer ? this.mediaBuffer : this.media,
videoBuffer = this.videoBuffer ? this.videoBuffer : this.media,
bufferInfo = BufferHelper.bufferInfo(media, pos, config.maxBufferHole),
mainBufferInfo = BufferHelper.bufferInfo(videoBuffer, pos, config.maxBufferHole),
bufferLen = bufferInfo.len,
bufferEnd = bufferInfo.end,
fragPrevious = this.fragPrevious,
// ensure we buffer at least config.maxBufferLength (default 30s) or config.maxMaxBufferLength (default: 600s)
// whichever is smaller.
// once we reach that threshold, don't buffer more than video (mainBufferInfo.len)
maxConfigBuffer = Math.min(config.maxBufferLength, config.maxMaxBufferLength),
maxBufLen = Math.max(maxConfigBuffer, mainBufferInfo.len),
audioSwitch = this.audioSwitch,
trackId = this.trackId;
// if buffer length is less than maxBufLen try to load a new fragment
if ((bufferLen < maxBufLen || audioSwitch) && trackId < tracks.length) {
trackDetails = tracks[trackId].details;
// if track info not retrieved yet, switch state and wait for track retrieval
if (typeof trackDetails === 'undefined') {
this.state = State.WAITING_TRACK;
break;
}
// check if we need to finalize media stream
// we just got done loading the final fragment and there is no other buffered range after ...
// rationale is that in case there are any buffered ranges after, it means that there are unbuffered portion in between
// so we should not switch to ENDED in that case, to be able to buffer them
if (!audioSwitch && !trackDetails.live && fragPrevious && fragPrevious.sn === trackDetails.endSN && !bufferInfo.nextStart) {
// if we are not seeking or if we are seeking but everything (almost) til the end is buffered, let's signal eos
// we don't compare exactly media.duration === bufferInfo.end as there could be some subtle media duration difference when switching
// between different renditions. using half frag duration should help cope with these cases.
if (!this.media.seeking || (this.media.duration - bufferEnd) < fragPrevious.duration / 2) {
// Finalize the media stream
this.hls.trigger(Event.BUFFER_EOS, { type: 'audio' });
this.state = State.ENDED;
break;
}
}
// find fragment index, contiguous with end of buffer position
let fragments = trackDetails.fragments,
fragLen = fragments.length,
start = fragments[0].start,
end = fragments[fragLen - 1].start + fragments[fragLen - 1].duration,
frag;
// When switching audio track, reload audio as close as possible to currentTime
if (audioSwitch) {
if (trackDetails.live && !trackDetails.PTSKnown) {
logger.log('switching audiotrack, live stream, unknown PTS,load first fragment');
bufferEnd = 0;
} else {
bufferEnd = pos;
// if currentTime (pos) is less than alt audio playlist start time, it means that alt audio is ahead of currentTime
if (trackDetails.PTSKnown && pos < start) {
// if everything is buffered from pos to start or if audio buffer upfront, let's seek to start
if (bufferInfo.end > start || bufferInfo.nextStart) {
logger.log('alt audio track ahead of main track, seek to start of alt audio track');
this.media.currentTime = start + 0.05;
} else {
return;
}
}
}
}
if (trackDetails.initSegment && !trackDetails.initSegment.data) {
frag = trackDetails.initSegment;
} // eslint-disable-line brace-style
// if bufferEnd before start of playlist, load first fragment
else if (bufferEnd <= start) {
frag = fragments[0];
if (this.videoTrackCC !== null && frag.cc !== this.videoTrackCC) {
// Ensure we find a fragment which matches the continuity of the video track
frag = findFragWithCC(fragments, this.videoTrackCC);
}
if (trackDetails.live && frag.loadIdx && frag.loadIdx === this.fragLoadIdx) {
// we just loaded this first fragment, and we are still lagging behind the start of the live playlist
// let's force seek to start
const nextBuffered = bufferInfo.nextStart ? bufferInfo.nextStart : start;
logger.log(`no alt audio available @currentTime:${this.media.currentTime}, seeking @${nextBuffered + 0.05}`);
this.media.currentTime = nextBuffered + 0.05;
return;
}
} else {
let foundFrag;
let maxFragLookUpTolerance = config.maxFragLookUpTolerance;
const fragNext = fragPrevious ? fragments[fragPrevious.sn - fragments[0].sn + 1] : undefined;
let fragmentWithinToleranceTest = (candidate) => {
// offset should be within fragment boundary - config.maxFragLookUpTolerance
// this is to cope with situations like
// bufferEnd = 9.991
// frag[Ø] : [0,10]
// frag[1] : [10,20]
// bufferEnd is within frag[0] range ... although what we are expecting is to return frag[1] here
// frag start frag start+duration
// |-----------------------------|
// <---> <--->
// ...--------><-----------------------------><---------....
// previous frag matching fragment next frag
// return -1 return 0 return 1
// logger.log(`level/sn/start/end/bufEnd:${level}/${candidate.sn}/${candidate.start}/${(candidate.start+candidate.duration)}/${bufferEnd}`);
// Set the lookup tolerance to be small enough to detect the current segment - ensures we don't skip over very small segments
let candidateLookupTolerance = Math.min(maxFragLookUpTolerance, candidate.duration);
if ((candidate.start + candidate.duration - candidateLookupTolerance) <= bufferEnd)
return 1;
// if maxFragLookUpTolerance will have negative value then don't return -1 for first element
else if (candidate.start - candidateLookupTolerance > bufferEnd && candidate.start)
return -1;
return 0;
};
if (bufferEnd < end) {
if (bufferEnd > end - maxFragLookUpTolerance)
maxFragLookUpTolerance = 0;
// Prefer the next fragment if it's within tolerance
if (fragNext && !fragmentWithinToleranceTest(fragNext))
foundFrag = fragNext;
else
foundFrag = BinarySearch.search(fragments, fragmentWithinToleranceTest);
} else {
// reach end of playlist
foundFrag = fragments[fragLen - 1];
}
if (foundFrag) {
frag = foundFrag;
start = foundFrag.start;
// logger.log('find SN matching with pos:' + bufferEnd + ':' + frag.sn);
if (fragPrevious && frag.level === fragPrevious.level && frag.sn === fragPrevious.sn) {
if (frag.sn < trackDetails.endSN) {
frag = fragments[frag.sn + 1 - trackDetails.startSN];
logger.log(`SN just loaded, load next one: ${frag.sn}`);
} else {
frag = null;
}
}
}
}
if (frag) {
// logger.log(' loading frag ' + i +',pos/bufEnd:' + pos.toFixed(3) + '/' + bufferEnd.toFixed(3));
if (frag.decryptdata && (frag.decryptdata.uri != null) && (frag.decryptdata.key == null)) {
logger.log(`Loading key for ${frag.sn} of [${trackDetails.startSN} ,${trackDetails.endSN}],track ${trackId}`);
this.state = State.KEY_LOADING;
hls.trigger(Event.KEY_LOADING, { frag: frag });
} else {
logger.log(`Loading ${frag.sn}, cc: ${frag.cc} of [${trackDetails.startSN} ,${trackDetails.endSN}],track ${trackId}, currentTime:${pos},bufferEnd:${bufferEnd.toFixed(3)}`);
// Check if fragment is not loaded
if (this.fragmentTracker.getState(frag) === FragmentState.NOT_LOADED) {
this.fragCurrent = frag;
this.startFragRequested = true;
if (!isNaN(frag.sn))
this.nextLoadPosition = frag.start + frag.duration;
hls.trigger(Event.FRAG_LOADING, { frag });
this.state = State.FRAG_LOADING;
}
}
}
}
break;
case State.WAITING_TRACK:
track = this.tracks[this.trackId];
// check if playlist is already loaded
if (track && track.details)
this.state = State.IDLE;
break;
case State.FRAG_LOADING_WAITING_RETRY:
var now = performance.now();
var retryDate = this.retryDate;
media = this.media;
var isSeeking = media && media.seeking;
// if current time is gt than retryDate, or if media seeking let's switch to IDLE state to retry loading
if (!retryDate || (now >= retryDate) || isSeeking) {
logger.log('audioStreamController: retryDate reached, switch back to IDLE state');
this.state = State.IDLE;
}
break;
case State.WAITING_INIT_PTS:
const videoTrackCC = this.videoTrackCC;
if (this.initPTS[videoTrackCC] === undefined)
break;
// Ensure we don't get stuck in the WAITING_INIT_PTS state if the waiting frag CC doesn't match any initPTS
const waitingFrag = this.waitingFragment;
if (waitingFrag) {
const waitingFragCC = waitingFrag.frag.cc;
if (videoTrackCC !== waitingFragCC) {
track = this.tracks[this.trackId];
if (track.details && track.details.live) {
logger.warn(`Waiting fragment CC (${waitingFragCC}) does not match video track CC (${videoTrackCC})`);
this.waitingFragment = null;
this.state = State.IDLE;
}
} else {
this.state = State.FRAG_LOADING;
this.onFragLoaded(this.waitingFragment);
this.waitingFragment = null;
}
} else {
this.state = State.IDLE;
}
break;
case State.STOPPED:
case State.FRAG_LOADING:
case State.PARSING:
case State.PARSED:
case State.ENDED:
break;
default:
break;
}
}
onMediaAttached (data) {
let media = this.media = this.mediaBuffer = data.media;
this.onvseeking = this.onMediaSeeking.bind(this);
this.onvended = this.onMediaEnded.bind(this);
media.addEventListener('seeking', this.onvseeking);
media.addEventListener('ended', this.onvended);
let config = this.config;
if (this.tracks && config.autoStartLoad)
this.startLoad(config.startPosition);
}
onMediaDetaching () {
let media = this.media;
if (media && media.ended) {
logger.log('MSE detaching and video ended, reset startPosition');
this.startPosition = this.lastCurrentTime = 0;
}
// remove video listeners
if (media) {
media.removeEventListener('seeking', this.onvseeking);
media.removeEventListener('ended', this.onvended);
this.onvseeking = this.onvseeked = this.onvended = null;
}
this.media = this.mediaBuffer = this.videoBuffer = null;
this.loadedmetadata = false;
this.stopLoad();
}
onMediaSeeking () {
if (this.state === State.ENDED) {
// switch to IDLE state to check for potential new fragment
this.state = State.IDLE;
}
if (this.media)
this.lastCurrentTime = this.media.currentTime;
// tick to speed up processing
this.tick();
}
onMediaEnded () {
// reset startPosition and lastCurrentTime to restart playback @ stream beginning
this.startPosition = this.lastCurrentTime = 0;
}
onAudioTracksUpdated (data) {
logger.log('audio tracks updated');
this.tracks = data.audioTracks;
}
onAudioTrackSwitching (data) {
// if any URL found on new audio track, it is an alternate audio track
let altAudio = !!data.url;
this.trackId = data.id;
this.fragCurrent = null;
this.state = State.PAUSED;
this.waitingFragment = null;
// destroy useless demuxer when switching audio to main
if (!altAudio) {
if (this.demuxer) {
this.demuxer.destroy();
this.demuxer = null;
}
} else {
// switching to audio track, start timer if not already started
this.setInterval(100);
}
// should we switch tracks ?
if (altAudio) {
this.audioSwitch = true;
// main audio track are handled by stream-controller, just do something if switching to alt audio track
this.state = State.IDLE;
}
this.tick();
}
onAudioTrackLoaded (data) {
let newDetails = data.details,
trackId = data.id,
track = this.tracks[trackId],
duration = newDetails.totalduration,
sliding = 0;
logger.log(`track ${trackId} loaded [${newDetails.startSN},${newDetails.endSN}],duration:${duration}`);
if (newDetails.live) {
let curDetails = track.details;
if (curDetails && newDetails.fragments.length > 0) {
// we already have details for that level, merge them
LevelHelper.mergeDetails(curDetails, newDetails);
sliding = newDetails.fragments[0].start;
// TODO
// this.liveSyncPosition = this.computeLivePosition(sliding, curDetails);
if (newDetails.PTSKnown)
logger.log(`live audio playlist sliding:${sliding.toFixed(3)}`);
else
logger.log('live audio playlist - outdated PTS, unknown sliding');
} else {
newDetails.PTSKnown = false;
logger.log('live audio playlist - first load, unknown sliding');
}
} else {
newDetails.PTSKnown = false;
}
track.details = newDetails;
// compute start position
if (!this.startFragRequested) {
// compute start position if set to -1. use it straight away if value is defined
if (this.startPosition === -1) {
// first, check if start time offset has been set in playlist, if yes, use this value
let startTimeOffset = newDetails.startTimeOffset;
if (!isNaN(startTimeOffset)) {
logger.log(`start time offset found in playlist, adjust startPosition to ${startTimeOffset}`);
this.startPosition = startTimeOffset;
} else {
this.startPosition = 0;
}
}
this.nextLoadPosition = this.startPosition;
}
// only switch batck to IDLE state if we were waiting for track to start downloading a new fragment
if (this.state === State.WAITING_TRACK)
this.state = State.IDLE;
// trigger handler right now
this.tick();
}
onKeyLoaded () {
if (this.state === State.KEY_LOADING) {
this.state = State.IDLE;
this.tick();
}
}
onFragLoaded (data) {
let fragCurrent = this.fragCurrent,
fragLoaded = data.frag;
Iif (this.state === State.FRAG_LOADING &&
fragCurrent &&
fragLoaded.type === 'audio' &&
fragLoaded.level === fragCurrent.level &&
fragLoaded.sn === fragCurrent.sn) {
let track = this.tracks[this.trackId],
details = track.details,
duration = details.totalduration,
trackId = fragCurrent.level,
sn = fragCurrent.sn,
cc = fragCurrent.cc,
audioCodec = this.config.defaultAudioCodec || track.audioCodec || 'mp4a.40.2',
stats = this.stats = data.stats;
if (sn === 'initSegment') {
this.state = State.IDLE;
stats.tparsed = stats.tbuffered = performance.now();
details.initSegment.data = data.payload;
this.hls.trigger(Event.FRAG_BUFFERED, { stats: stats, frag: fragCurrent, id: 'audio' });
this.tick();
} else {
this.state = State.PARSING;
// transmux the MPEG-TS data to ISO-BMFF segments
this.appended = false;
if (!this.demuxer)
this.demuxer = new Demuxer(this.hls, 'audio');
// Check if we have video initPTS
// If not we need to wait for it
let initPTS = this.initPTS[cc];
let initSegmentData = details.initSegment ? details.initSegment.data : [];
if (details.initSegment || initPTS !== undefined) {
this.pendingBuffering = true;
logger.log(`Demuxing ${sn} of [${details.startSN} ,${details.endSN}],track ${trackId}`);
// time Offset is accurate if level PTS is known, or if playlist is not sliding (not live)
let accurateTimeOffset = false; // details.PTSKnown || !details.live;
this.demuxer.push(data.payload, initSegmentData, audioCodec, null, fragCurrent, duration, accurateTimeOffset, initPTS);
} else {
logger.log(`unknown video PTS for continuity counter ${cc}, waiting for video PTS before demuxing audio frag ${sn} of [${details.startSN} ,${details.endSN}],track ${trackId}`);
this.waitingFragment = data;
this.state = State.WAITING_INIT_PTS;
}
}
}
this.fragLoadError = 0;
}
onFragParsingInitSegment (data) {
const fragCurrent = this.fragCurrent;
const fragNew = data.frag;
if (fragCurrent &&
data.id === 'audio' &&
fragNew.sn === fragCurrent.sn &&
fragNew.level === fragCurrent.level &&
this.state === State.PARSING) {
let tracks = data.tracks, track;
// delete any video track found on audio demuxer
if (tracks.video)
delete tracks.video;
// include levelCodec in audio and video tracks
track = tracks.audio;
if (track) {
track.levelCodec = track.codec;
track.id = data.id;
this.hls.trigger(Event.BUFFER_CODECS, tracks);
logger.log(`audio track:audio,container:${track.container},codecs[level/parsed]=[${track.levelCodec}/${track.codec}]`);
let initSegment = track.initSegment;
if (initSegment) {
let appendObj = { type: 'audio', data: initSegment, parent: 'audio', content: 'initSegment' };
if (this.audioSwitch) {
this.pendingData = [appendObj];
} else {
this.appended = true;
// arm pending Buffering flag before appending a segment
this.pendingBuffering = true;
this.hls.trigger(Event.BUFFER_APPENDING, appendObj);
}
}
// trigger handler right now
this.tick();
}
}
}
onFragParsingData (data) {
const fragCurrent = this.fragCurrent;
const fragNew = data.frag;
if (fragCurrent &&
data.id === 'audio' &&
data.type === 'audio' &&
fragNew.sn === fragCurrent.sn &&
fragNew.level === fragCurrent.level &&
this.state === State.PARSING) {
let trackId = this.trackId,
track = this.tracks[trackId],
hls = this.hls;
if (isNaN(data.endPTS)) {
data.endPTS = data.startPTS + fragCurrent.duration;
data.endDTS = data.startDTS + fragCurrent.duration;
}
fragCurrent.addElementaryStream(Fragment.ElementaryStreamTypes.AUDIO);
logger.log(`parsed ${data.type},PTS:[${data.startPTS.toFixed(3)},${data.endPTS.toFixed(3)}],DTS:[${data.startDTS.toFixed(3)}/${data.endDTS.toFixed(3)}],nb:${data.nb}`);
LevelHelper.updateFragPTSDTS(track.details, fragCurrent, data.startPTS, data.endPTS);
let audioSwitch = this.audioSwitch, media = this.media, appendOnBufferFlush = false;
// Only flush audio from old audio tracks when PTS is known on new audio track
if (audioSwitch && media) {
if (media.readyState) {
let currentTime = media.currentTime;
logger.log('switching audio track : currentTime:' + currentTime);
if (currentTime >= data.startPTS) {
logger.log('switching audio track : flushing all audio');
this.state = State.BUFFER_FLUSHING;
hls.trigger(Event.BUFFER_FLUSHING, { startOffset: 0, endOffset: Number.POSITIVE_INFINITY, type: 'audio' });
appendOnBufferFlush = true;
// Lets announce that the initial audio track switch flush occur
this.audioSwitch = false;
hls.trigger(Event.AUDIO_TRACK_SWITCHED, { id: trackId });
}
} else {
// Lets announce that the initial audio track switch flush occur
this.audioSwitch = false;
hls.trigger(Event.AUDIO_TRACK_SWITCHED, { id: trackId });
}
}
let pendingData = this.pendingData;
if (!pendingData) {
console.warn('Apparently attempt to enqueue media payload without codec initialization data upfront');
hls.trigger(Event.ERROR, { type: ErrorTypes.MEDIA_ERROR, details: null, fatal: true });
return;
}
if (!this.audioSwitch) {
[data.data1, data.data2].forEach(buffer => {
if (buffer && buffer.length)
pendingData.push({ type: data.type, data: buffer, parent: 'audio', content: 'data' });
});
if (!appendOnBufferFlush && pendingData.length) {
pendingData.forEach(appendObj => {
// only append in PARSING state (rationale is that an appending error could happen synchronously on first segment appending)
// in that case it is useless to append following segments
if (this.state === State.PARSING) {
// arm pending Buffering flag before appending a segment
this.pendingBuffering = true;
this.hls.trigger(Event.BUFFER_APPENDING, appendObj);
}
});
this.pendingData = [];
this.appended = true;
}
}
// trigger handler right now
this.tick();
}
}
onFragParsed (data) {
const fragCurrent = this.fragCurrent;
const fragNew = data.frag;
if (fragCurrent &&
data.id === 'audio' &&
fragNew.sn === fragCurrent.sn &&
fragNew.level === fragCurrent.level &&
this.state === State.PARSING) {
this.stats.tparsed = performance.now();
this.state = State.PARSED;
this._checkAppendedParsed();
}
}
onBufferReset () {
// reset reference to sourcebuffers
this.mediaBuffer = this.videoBuffer = null;
this.loadedmetadata = false;
}
onBufferCreated (data) {
let audioTrack = data.tracks.audio;
if (audioTrack) {
this.mediaBuffer = audioTrack.buffer;
this.loadedmetadata = true;
}
if (data.tracks.video)
this.videoBuffer = data.tracks.video.buffer;
}
onBufferAppended (data) {
Iif (data.parent === 'audio') {
const state = this.state;
if (state === State.PARSING || state === State.PARSED) {
// check if all buffers have been appended
this.pendingBuffering = (data.pending > 0);
this._checkAppendedParsed();
}
}
}
_checkAppendedParsed () {
// trigger handler right now
if (this.state === State.PARSED && (!this.appended || !this.pendingBuffering)) {
let frag = this.fragCurrent, stats = this.stats, hls = this.hls;
if (frag) {
this.fragPrevious = frag;
stats.tbuffered = performance.now();
hls.trigger(Event.FRAG_BUFFERED, { stats: stats, frag: frag, id: 'audio' });
let media = this.mediaBuffer ? this.mediaBuffer : this.media;
logger.log(`audio buffered : ${TimeRanges.toString(media.buffered)}`);
if (this.audioSwitch && this.appended) {
this.audioSwitch = false;
hls.trigger(Event.AUDIO_TRACK_SWITCHED, { id: this.trackId });
}
this.state = State.IDLE;
}
this.tick();
}
}
onError (data) {
let frag = data.frag;
// don't handle frag error not related to audio fragment
Iif (frag && frag.type !== 'audio')
return;
switch (data.details) {
case ErrorDetails.FRAG_LOAD_ERROR:
case ErrorDetails.FRAG_LOAD_TIMEOUT:
if (!data.fatal) {
let loadError = this.fragLoadError;
if (loadError)
loadError++;
else
loadError = 1;
let config = this.config;
if (loadError <= config.fragLoadingMaxRetry) {
this.fragLoadError = loadError;
// exponential backoff capped to config.fragLoadingMaxRetryTimeout
let delay = Math.min(Math.pow(2, loadError - 1) * config.fragLoadingRetryDelay, config.fragLoadingMaxRetryTimeout);
logger.warn(`audioStreamController: frag loading failed, retry in ${delay} ms`);
this.retryDate = performance.now() + delay;
// retry loading state
this.state = State.FRAG_LOADING_WAITING_RETRY;
} else {
logger.error(`audioStreamController: ${data.details} reaches max retry, redispatch as fatal ...`);
// switch error to fatal
data.fatal = true;
this.state = State.ERROR;
}
}
break;
case ErrorDetails.AUDIO_TRACK_LOAD_ERROR:
case ErrorDetails.AUDIO_TRACK_LOAD_TIMEOUT:
case ErrorDetails.KEY_LOAD_ERROR:
case ErrorDetails.KEY_LOAD_TIMEOUT:
// when in ERROR state, don't switch back to IDLE state in case a non-fatal error is received
if (this.state !== State.ERROR) {
// if fatal error, stop processing, otherwise move to IDLE to retry loading
this.state = data.fatal ? State.ERROR : State.IDLE;
logger.warn(`audioStreamController: ${data.details} while loading frag,switch to ${this.state} state ...`);
}
break;
case ErrorDetails.BUFFER_FULL_ERROR:
// if in appending state
if (data.parent === 'audio' && (this.state === State.PARSING || this.state === State.PARSED)) {
const media = this.mediaBuffer,
currentTime = this.media.currentTime,
mediaBuffered = media && BufferHelper.isBuffered(media, currentTime) && BufferHelper.isBuffered(media, currentTime + 0.5);
// reduce max buf len if current position is buffered
if (mediaBuffered) {
const config = this.config;
if (config.maxMaxBufferLength >= config.maxBufferLength) {
// reduce max buffer length as it might be too high. we do this to avoid loop flushing ...
config.maxMaxBufferLength /= 2;
logger.warn(`audio:reduce max buffer length to ${config.maxMaxBufferLength}s`);
}
this.state = State.IDLE;
} else {
// current position is not buffered, but browser is still complaining about buffer full error
// this happens on IE/Edge, refer to https://github.com/video-dev/hls.js/pull/708
// in that case flush the whole audio buffer to recover
logger.warn('buffer full error also media.currentTime is not buffered, flush audio buffer');
this.fragCurrent = null;
// flush everything
this.state = State.BUFFER_FLUSHING;
this.hls.trigger(Event.BUFFER_FLUSHING, { startOffset: 0, endOffset: Number.POSITIVE_INFINITY, type: 'audio' });
}
}
break;
default:
break;
}
}
onBufferFlushed () {
let pendingData = this.pendingData;
if (pendingData && pendingData.length) {
logger.log('appending pending audio data on Buffer Flushed');
pendingData.forEach(appendObj => {
this.hls.trigger(Event.BUFFER_APPENDING, appendObj);
});
this.appended = true;
this.pendingData = [];
this.state = State.PARSED;
} else {
// move to IDLE once flush complete. this should trigger new fragment loading
this.state = State.IDLE;
// reset reference to frag
this.fragPrevious = null;
this.tick();
}
}
}
export default AudioStreamController;
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