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Optimize media tag codec parsing, add a test for it, extract tag strings into constants

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This commit is contained in:
Vanilagy
2026-04-16 11:31:43 +02:00
parent 2d0aac3208
commit f99adf2208
4 changed files with 102 additions and 53 deletions
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src/hls/hls-segmented-input.ts
+32 -19
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@@ -13,7 +13,20 @@ import { toDataView, joinPaths, last, assert, binarySearchLessOrEqual, arrayArgm
import { readAllLines, readBytes, Reader } from '../reader';
import { PathedSource, ReadableStreamSource, SourceRef } from '../source';
import { HlsDemuxer } from './hls-demuxer';
import { AttributeList, canIgnoreLine } from './hls-misc';
import {
AttributeList,
canIgnoreLine,
TAG_BYTERANGE,
TAG_DISCONTINUITY,
TAG_ENDLIST,
TAG_EXTINF,
TAG_KEY,
TAG_MAP,
TAG_MEDIA_SEQUENCE,
TAG_PLAYLIST_TYPE,
TAG_PROGRAM_DATE_TIME,
TAG_TARGETDURATION,
} from './hls-misc';
const IV_STRING_REGEX = /^0[xX][0-9a-fA-F]+$/;
@@ -229,7 +242,7 @@ export class HlsSegmentedInput extends SegmentedInput {
setNextSequenceNumber(nextSequenceNumber + 1);
}
if (line.startsWith('#EXTINF:')) {
if (line.startsWith(TAG_EXTINF)) {
if (prevLastSegment) {
segmentSeen = true;
continue;
@@ -244,7 +257,7 @@ export class HlsSegmentedInput extends SegmentedInput {
segmentSeen = true;
}
const extinfContent = line.slice(8);
const extinfContent = line.slice(TAG_EXTINF.length);
const commaIndex = extinfContent.indexOf(',');
const durationStr = commaIndex === -1 ? extinfContent : extinfContent.slice(0, commaIndex);
const duration = Number(durationStr);
@@ -253,8 +266,8 @@ export class HlsSegmentedInput extends SegmentedInput {
}
nextSegmentDuration = duration;
} else if (line.startsWith('#EXT-X-MAP:')) {
const attributes = new AttributeList(line.slice(11));
} else if (line.startsWith(TAG_MAP)) {
const attributes = new AttributeList(line.slice(TAG_MAP.length));
const uri = attributes.get('uri');
if (!uri) {
throw new Error('Invalid #EXT-X-MAP tag; missing URI attribute.');
@@ -308,8 +321,8 @@ export class HlsSegmentedInput extends SegmentedInput {
} else {
nextByteRange = null;
}
} else if (line.startsWith('#EXT-X-KEY:')) {
const attributes = new AttributeList(line.slice(11));
} else if (line.startsWith(TAG_KEY)) {
const attributes = new AttributeList(line.slice(TAG_KEY.length));
const method = attributes.get('method');
if (method === 'NONE') {
@@ -349,8 +362,8 @@ export class HlsSegmentedInput extends SegmentedInput {
+ ` please raise an issue.`,
);
}
} else if (line.startsWith('#EXT-X-MEDIA-SEQUENCE:')) {
const value = line.slice(22);
} else if (line.startsWith(TAG_MEDIA_SEQUENCE)) {
const value = line.slice(TAG_MEDIA_SEQUENCE.length);
const number = Number(value);
if (!Number.isInteger(number) || number < 0) {
@@ -358,8 +371,8 @@ export class HlsSegmentedInput extends SegmentedInput {
}
setNextSequenceNumber(number);
} else if (line.startsWith('#EXT-X-BYTERANGE:')) {
const parsed = parseByteRange(line.slice(17));
} else if (line.startsWith(TAG_BYTERANGE)) {
const parsed = parseByteRange(line.slice(TAG_BYTERANGE.length));
if (parsed.offset === null) {
if (lastByteRangeEnd === null) {
throw new Error(
@@ -371,14 +384,14 @@ export class HlsSegmentedInput extends SegmentedInput {
nextByteRange = parsed as { length: number; offset: number };
lastByteRangeEnd = parsed.offset + parsed.length;
} else if (line.startsWith('#EXT-X-PROGRAM-DATE-TIME:')) {
} else if (line.startsWith(TAG_PROGRAM_DATE_TIME)) {
if (prevLastSegment) {
// No need to spend effort parsing dates if we're gonna discard it anyway. Also would be wrong to do
// the segment shifting!
continue;
}
const dateTime = line.slice(25);
const dateTime = line.slice(TAG_PROGRAM_DATE_TIME.length);
const dateTimeMs = Date.parse(dateTime);
if (!Number.isFinite(dateTimeMs)) {
@@ -409,11 +422,11 @@ export class HlsSegmentedInput extends SegmentedInput {
lastProgramDateTimeSeconds = dateTimeSeconds;
accumulatedTime = dateTimeSeconds; // Snap the accumulated time to the datetime
} else if (line === '#EXT-X-DISCONTINUITY') {
} else if (line === TAG_DISCONTINUITY) {
currentFirstSegment = null;
currentInitSegment = null;
} else if (line.startsWith('#EXT-X-TARGETDURATION:')) {
const value = line.slice(22);
} else if (line.startsWith(TAG_TARGETDURATION)) {
const value = line.slice(TAG_TARGETDURATION.length);
const duration = Number(value);
if (!Number.isFinite(duration) || duration < 0) {
@@ -422,11 +435,11 @@ export class HlsSegmentedInput extends SegmentedInput {
this.refreshInterval = duration;
targetDuration = duration;
} else if (line === '#EXT-X-ENDLIST') {
} else if (line === TAG_ENDLIST) {
this.streamHasEnded = true;
break; // No need to keep reading after this
} else if (line.startsWith('#EXT-X-PLAYLIST-TYPE')) {
const type = line.slice(21);
} else if (line.startsWith(TAG_PLAYLIST_TYPE)) {
const type = line.slice(TAG_PLAYLIST_TYPE.length);
if (type.toLowerCase() === 'vod') {
// A VOD playlist cannot be updated per spec so we can be sure the stream has ended
this.streamHasEnded = true;