Sebastian Krüger
ee48f9475f
Phase 6.5 Advanced Effects: - Add Pitch Shifter with semitones and cents adjustment - Add Time Stretch with pitch preservation using overlap-add - Add Distortion with soft/hard/tube types and tone control - Add Bitcrusher with bit depth and sample rate reduction - Add AdvancedParameterDialog with real-time waveform visualization - Add 4 professional presets per effect type Improvements: - Fix undefined parameter errors by adding nullish coalescing operators - Add global custom scrollbar styling with color-mix transparency - Add custom-scrollbar utility class for side panel - Improve theme-aware scrollbar appearance in light/dark modes - Fix parameter initialization when switching effect types Integration: - All advanced effects support undo/redo via EffectCommand - Effects accessible via command palette and side panel - Selection-based processing support - Toast notifications for all effects 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
53 lines
1.3 KiB
TypeScript
53 lines
1.3 KiB
TypeScript
/**
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* Gain/Volume adjustment effect
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*/
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import { getAudioContext } from '../context';
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/**
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* Apply gain to an audio buffer
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* @param buffer - Source audio buffer
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* @param gainValue - Gain multiplier (1.0 = no change, 0.5 = -6dB, 2.0 = +6dB)
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* @returns New audio buffer with gain applied
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*/
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export function applyGain(buffer: AudioBuffer, gainValue: number): AudioBuffer {
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const audioContext = getAudioContext();
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const outputBuffer = audioContext.createBuffer(
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buffer.numberOfChannels,
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buffer.length,
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buffer.sampleRate
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);
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// Apply gain to each channel
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for (let channel = 0; channel < buffer.numberOfChannels; channel++) {
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const inputData = buffer.getChannelData(channel);
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const outputData = outputBuffer.getChannelData(channel);
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for (let i = 0; i < buffer.length; i++) {
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outputData[i] = inputData[i] * gainValue;
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// Clamp to prevent distortion
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outputData[i] = Math.max(-1, Math.min(1, outputData[i]));
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}
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}
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return outputBuffer;
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}
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/**
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* Convert dB to gain multiplier
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* @param db - Decibels
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* @returns Gain multiplier
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*/
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export function dbToGain(db: number): number {
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return Math.pow(10, db / 20);
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}
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/**
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* Convert gain multiplier to dB
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* @param gain - Gain multiplier
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* @returns Decibels
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*/
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export function gainToDb(gain: number): number {
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return 20 * Math.log10(gain);
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}
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