pw-client/dist/format-negotiation.mjs

Node.js wrapper for developing PipeWire clients

import { AudioFormat } from "./audio-format.mjs";
/**
 * Sample converter functions for each audio format.
 * null indicates no conversion needed (identity function).
 */
const SAMPLE_CONVERTERS = new Map([
    [AudioFormat.Float64, null], // No conversion needed
    [AudioFormat.Float32, null], // Float32Array constructor handles this
    [
        AudioFormat.Int16,
        (sample) => {
            const clamped = Math.max(-1, Math.min(1, sample));
            return Math.round(clamped * 32767);
        },
    ],
    [
        AudioFormat.Int32,
        (sample) => {
            const clamped = Math.max(-1, Math.min(1, sample));
            return Math.round(clamped * 2147483647);
        },
    ],
    [
        AudioFormat.Uint16,
        (sample) => {
            const clamped = Math.max(-1, Math.min(1, sample));
            return Math.round((clamped + 1) * 32767.5);
        },
    ],
    [
        AudioFormat.Int8,
        (sample) => {
            const clamped = Math.max(-1, Math.min(1, sample));
            return Math.round(clamped * 127);
        },
    ],
    [
        AudioFormat.Uint8,
        (sample) => {
            const clamped = Math.max(-1, Math.min(1, sample));
            return Math.round((clamped + 1) * 127.5);
        },
    ],
]);
/**
 * Automatic sample converter that adapts Float64 streams to target format.
 * Returns the original iterable if no conversion is needed for optimal performance.
 */
export function adaptSamples(samples, targetFormat) {
    const converter = SAMPLE_CONVERTERS.get(targetFormat) ?? null;
    // No conversion needed - return original iterable for maximum efficiency
    if (converter === null) {
        return samples;
    }
    // Conversion needed - return generator that applies the converter
    return (function* () {
        for (const sample of samples) {
            yield converter(sample);
        }
    })();
}