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Implement ReadOrchestrator class, add highly optimized UrlSource

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This commit is contained in:
Vanilagy
2025-08-29 19:39:50 +02:00
parent 641cdd02e3
commit c93755def1
15 changed files with 704 additions and 824 deletions
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src/ogg/ogg-demuxer.ts
+4 -14
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@@ -46,7 +46,6 @@ export class OggDemuxer extends Demuxer {
reader: Reader2;
metadataPromise: Promise<void> | null = null;
fileSize: number | null = null;
bitstreams: LogicalBitstream[] = [];
tracks: InputAudioTrack[] = [];
@@ -58,12 +57,8 @@ export class OggDemuxer extends Demuxer {
async readMetadata() {
return this.metadataPromise ??= (async () => {
let fileSize = this.reader.requestSize();
if (fileSize instanceof Promise) fileSize = await fileSize;
this.fileSize = fileSize;
let currentPos = 0;
while (currentPos <= this.fileSize - MIN_PAGE_HEADER_SIZE) {
while (currentPos <= this.reader.fileSize - MIN_PAGE_HEADER_SIZE) {
let slice = this.reader.requestSliceRange(currentPos, MIN_PAGE_HEADER_SIZE, MAX_PAGE_HEADER_SIZE);
if (slice instanceof Promise) slice = await slice;
if (!slice) break;
@@ -249,7 +244,6 @@ export class OggDemuxer extends Demuxer {
async readPacket(startPage: Page, startSegmentIndex: number): Promise<Packet | null> {
assert(startSegmentIndex < startPage.lacingValues.length);
assert(this.fileSize);
let startDataOffset = 0;
for (let i = 0; i < startSegmentIndex; i++) {
@@ -290,7 +284,7 @@ export class OggDemuxer extends Demuxer {
// The packet extends to the next page; let's find it
let currentPos = currentPage.headerStartPos + currentPage.totalSize;
while (true) {
if (currentPos > this.fileSize - MIN_PAGE_HEADER_SIZE) {
if (currentPos > this.reader.fileSize - MIN_PAGE_HEADER_SIZE) {
return null;
}
@@ -335,8 +329,6 @@ export class OggDemuxer extends Demuxer {
}
async findNextPacketStart(lastPacket: Packet) {
assert(this.fileSize !== null);
// If there's another segment in the same page, return it
if (lastPacket.endSegmentIndex < lastPacket.endPage.lacingValues.length - 1) {
return { startPage: lastPacket.endPage, startSegmentIndex: lastPacket.endSegmentIndex + 1 };
@@ -351,7 +343,7 @@ export class OggDemuxer extends Demuxer {
// Otherwise, search for the next page belonging to the same bitstream
let currentPos = lastPacket.endPage.headerStartPos + lastPacket.endPage.totalSize;
while (true) {
if (currentPos >= this.fileSize - MIN_PAGE_HEADER_SIZE) {
if (currentPos >= this.reader.fileSize - MIN_PAGE_HEADER_SIZE) {
return null;
}
@@ -565,8 +557,6 @@ class OggAudioTrackBacking implements InputAudioTrackBacking {
}
async getPacket(timestamp: number, options: PacketRetrievalOptions) {
assert(this.demuxer.fileSize !== null);
const timestampInSamples = roundToPrecision(timestamp * this.internalSampleRate, 14);
if (timestampInSamples === 0) {
// Fast path for timestamp 0 - avoids binary search when playing back from the start
@@ -584,7 +574,7 @@ class OggAudioTrackBacking implements InputAudioTrackBacking {
}
let lowPage = startPosition.startPage;
let high = this.demuxer.fileSize;
let high = this.demuxer.reader.fileSize;
const lowPages: Page[] = [lowPage];