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Make MainSourceBufferInterface code more readable isolating inner functions #1569

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Make MainSourceBufferInterface code more readable isolating inner functions #1569

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95 changes: 49 additions & 46 deletions src/mse/main_media_source_interface.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -212,52 +212,8 @@ export class MainSourceBufferInterface implements ISourceBufferInterface {
this._operationQueue = [];
this._currentOperations = [];

const onError = (evt: Event) => {
let error: Error;
if ((evt as unknown as Error) instanceof Error) {
error = evt as unknown as Error;
} else if ((evt as unknown as { error: Error }).error instanceof Error) {
error = (evt as unknown as { error: Error }).error;
} else {
error = new Error("Unknown SourceBuffer Error");
}
const currentOps = this._currentOperations;
this._currentOperations = [];
if (currentOps.length === 0) {
log.error("SBI: error for an unknown operation", error);
} else {
const rejected = new SourceBufferError(
error.name,
error.message,
error.name === "QuotaExceededError",
);
for (const op of currentOps) {
op.reject(rejected);
}
}
};
const onUpdateEnd = () => {
const currentOps = this._currentOperations;
this._currentOperations = [];
try {
for (const op of currentOps) {
op.resolve(convertToRanges(this._sourceBuffer.buffered));
}
} catch (err) {
for (const op of currentOps) {
if (err instanceof Error && err.name === "InvalidStateError") {
// Most likely the SourceBuffer just has been removed from the
// `MediaSource`.
// Just return an empty buffered range.
op.resolve([]);
} else {
op.reject(err);
}
}
}
this._performNextOperation();
};

const onError = this._onError.bind(this);
const onUpdateEnd = this._onUpdateEnd.bind(this);
sourceBuffer.addEventListener("updateend", onUpdateEnd);
sourceBuffer.addEventListener("error", onError);
this._canceller.signal.register(() => {
Expand Down Expand Up @@ -325,6 +281,53 @@ export class MainSourceBufferInterface implements ISourceBufferInterface {
this._emptyCurrentQueue();
}

private _onError(evt: Event) {
let error: Error;
if ((evt as unknown as Error) instanceof Error) {
error = evt as unknown as Error;
} else if ((evt as unknown as { error: Error }).error instanceof Error) {
error = (evt as unknown as { error: Error }).error;
} else {
error = new Error("Unknown SourceBuffer Error");
}
const currentOps = this._currentOperations;
this._currentOperations = [];
if (currentOps.length === 0) {
log.error("SBI: error for an unknown operation", error);
} else {
const rejected = new SourceBufferError(
error.name,
error.message,
error.name === "QuotaExceededError",
);
for (const op of currentOps) {
op.reject(rejected);
}
}
}

private _onUpdateEnd() {
const currentOps = this._currentOperations;
this._currentOperations = [];
try {
for (const op of currentOps) {
op.resolve(convertToRanges(this._sourceBuffer.buffered));
}
} catch (err) {
for (const op of currentOps) {
if (err instanceof Error && err.name === "InvalidStateError") {
// Most likely the SourceBuffer just has been removed from the
// `MediaSource`.
// Just return an empty buffered range.
op.resolve([]);
} else {
op.reject(err);
}
}
}
this._performNextOperation();
}

private _emptyCurrentQueue(): void {
const error = new CancellationError();
if (this._currentOperations.length > 0) {
Expand Down
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