Codex
65 lines
2.8 KiB
JavaScript
65 lines
2.8 KiB
JavaScript
import { renderSignal } from "./signal.js";
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export const MAX_MIX_WORKING_BYTES = 384 * 1024 * 1024;
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export const MAX_MIX_SAMPLE_OPERATIONS = 250_000_000;
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export function estimateSceneMix(scene, assetBuffers = new Map()) {
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const sampleCount = Math.ceil(scene.duration * scene.sampleRate);
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const entryCount = scene.sources.length + (scene.ambient?.length ?? 0);
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let assetBytes = 0;
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for (const asset of assetBuffers.values()) {
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for (const channel of asset.channels ?? []) assetBytes += channel.byteLength ?? 0;
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}
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return {
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sampleCount,
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entryCount,
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assetBytes,
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workingBytes: sampleCount * Float32Array.BYTES_PER_ELEMENT * 2 + assetBytes,
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sampleOperations: sampleCount * entryCount,
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};
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}
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export function renderSceneMix(scene, assetBuffers = new Map()) {
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const estimate = estimateSceneMix(scene, assetBuffers);
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if (!Number.isSafeInteger(estimate.sampleCount) || estimate.sampleCount <= 0) {
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throw new Error("장면 sample 수가 올바르지 않습니다.");
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}
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if (estimate.workingBytes > MAX_MIX_WORKING_BYTES) {
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throw new Error(
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`확인용 mix 작업 메모리 ${(estimate.workingBytes / 1024 ** 2).toFixed(1)} MiB가 ` +
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`${(MAX_MIX_WORKING_BYTES / 1024 ** 2).toFixed(0)} MiB 한도를 넘습니다. duration 또는 sample rate를 줄이세요.`,
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);
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}
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if (estimate.sampleOperations > MAX_MIX_SAMPLE_OPERATIONS) {
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throw new Error(
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`확인용 mix 연산량 ${estimate.sampleOperations.toLocaleString()} samples가 ` +
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`${MAX_MIX_SAMPLE_OPERATIONS.toLocaleString()} 한도를 넘습니다. duration 또는 음원 수를 줄이세요.`,
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);
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}
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const { sampleCount } = estimate;
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const samples = new Float32Array(sampleCount);
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for (const source of scene.sources) {
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const sourceSamples = renderSignal(source, scene, assetBuffers);
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for (let index = 0; index < sampleCount; index += 1) samples[index] += sourceSamples[index];
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}
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for (const ambient of scene.ambient ?? []) {
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const ambientSamples = renderSignal(ambient, scene, assetBuffers);
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for (let index = 0; index < sampleCount; index += 1) samples[index] += ambientSamples[index];
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}
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let preNormalizationPeak = 0;
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for (const value of samples) preNormalizationPeak = Math.max(preNormalizationPeak, Math.abs(value));
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const appliedScale =
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scene.mix?.normalization === "peak" && preNormalizationPeak > 0
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? scene.mix.targetPeak / preNormalizationPeak
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: 1;
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let peak = 0;
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let clippedSampleCount = 0;
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for (let index = 0; index < samples.length; index += 1) {
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samples[index] *= appliedScale;
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peak = Math.max(peak, Math.abs(samples[index]));
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if (Math.abs(samples[index]) > 1) clippedSampleCount += 1;
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}
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return { samples, sampleRate: scene.sampleRate, preNormalizationPeak, appliedScale, peak, clippedSampleCount };
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}
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