@euirim/microsoft-cognitiveservices-speech-sdk/distrib/es2015/src/common/ChunkedArrayBufferStream.js

Microsoft Cognitive Services Speech SDK for JavaScript

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
import { Stream } from "./Exports";
export class ChunkedArrayBufferStream extends Stream {
    constructor(targetChunkSize, streamId) {
        super(streamId);
        this.privTargetChunkSize = targetChunkSize;
        this.privNextBufferReadyBytes = 0;
    }
    writeStreamChunk(chunk) {
        // No pending write, and the buffer is the right size so write it.
        if (chunk.isEnd ||
            (0 === this.privNextBufferReadyBytes && chunk.buffer.byteLength === this.privTargetChunkSize)) {
            super.writeStreamChunk(chunk);
            return;
        }
        let bytesCopiedFromBuffer = 0;
        while (bytesCopiedFromBuffer < chunk.buffer.byteLength) {
            // Fill the next buffer.
            if (undefined === this.privNextBufferToWrite) {
                this.privNextBufferToWrite = new ArrayBuffer(this.privTargetChunkSize);
                this.privNextBufferStartTime = chunk.timeReceived;
            }
            // Find out how many bytes we can copy into the read buffer.
            const bytesToCopy = Math.min(chunk.buffer.byteLength - bytesCopiedFromBuffer, this.privTargetChunkSize - this.privNextBufferReadyBytes);
            const targetView = new Uint8Array(this.privNextBufferToWrite);
            const sourceView = new Uint8Array(chunk.buffer.slice(bytesCopiedFromBuffer, bytesToCopy + bytesCopiedFromBuffer));
            targetView.set(sourceView, this.privNextBufferReadyBytes);
            this.privNextBufferReadyBytes += bytesToCopy;
            bytesCopiedFromBuffer += bytesToCopy;
            // Are we ready to write?
            if (this.privNextBufferReadyBytes === this.privTargetChunkSize) {
                super.writeStreamChunk({
                    buffer: this.privNextBufferToWrite,
                    isEnd: false,
                    timeReceived: this.privNextBufferStartTime,
                });
                this.privNextBufferReadyBytes = 0;
                this.privNextBufferToWrite = undefined;
            }
        }
    }
    close() {
        // Send whatever is pending, then close the base class.
        if (0 !== this.privNextBufferReadyBytes && !this.isClosed) {
            super.writeStreamChunk({
                buffer: this.privNextBufferToWrite.slice(0, this.privNextBufferReadyBytes),
                isEnd: false,
                timeReceived: this.privNextBufferStartTime,
            });
        }
        super.close();
    }
}

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