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94 lines
2.8 KiB
94 lines
2.8 KiB
// SPDX-License-Identifier: AGPL-3.0-only
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/**
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* Digital Voice Modem - DVMConsole
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* AGPLv3 Open Source. Use is subject to license terms.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* @package DVM / DVM Console
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* @license AGPLv3 License (https://opensource.org/licenses/AGPL-3.0)
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*
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* Copyright (C) 2024-2025 Caleb, K4PHP
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*
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*/
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using NAudio.Wave;
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namespace DVMConsole
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{
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/// <summary>
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///
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/// </summary>
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public class ToneGenerator
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{
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private readonly int _sampleRate = 8000;
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private readonly int _bitsPerSample = 16;
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private readonly int _channels = 1;
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private WaveOutEvent _waveOut;
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private BufferedWaveProvider _waveProvider;
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/// <summary>
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/// Creates an instance of <see cref="ToneGenerator"/>
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/// </summary>
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public ToneGenerator()
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{
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_waveOut = new WaveOutEvent();
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_waveProvider = new BufferedWaveProvider(new WaveFormat(_sampleRate, _bitsPerSample, _channels));
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_waveOut.Init(_waveProvider);
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}
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/// <summary>
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/// Generate a sine wave tone at the specified frequency and duration.
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/// </summary>
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/// <param name="frequency">Frequency in Hz</param>
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/// <param name="durationSeconds">Duration in seconds</param>
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/// <returns>PCM data as a byte array</returns>
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public byte[] GenerateTone(double frequency, double durationSeconds)
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{
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int sampleCount = (int)(_sampleRate * durationSeconds);
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byte[] buffer = new byte[sampleCount * (_bitsPerSample / 8)];
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for (int i = 0; i < sampleCount; i++)
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{
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double time = (double)i / _sampleRate;
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short sampleValue = (short)(Math.Sin(2 * Math.PI * frequency * time) * short.MaxValue);
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buffer[i * 2] = (byte)(sampleValue & 0xFF);
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buffer[i * 2 + 1] = (byte)((sampleValue >> 8) & 0xFF);
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}
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return buffer;
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}
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/// <summary>
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/// Play the generated tone through the speakers.
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/// </summary>
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/// <param name="frequency">Frequency in Hz</param>
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/// <param name="durationSeconds">Duration in seconds</param>
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public void PlayTone(double frequency, double durationSeconds)
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{
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byte[] toneData = GenerateTone(frequency, durationSeconds);
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_waveProvider.ClearBuffer();
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_waveProvider.AddSamples(toneData, 0, toneData.Length);
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_waveOut.Play();
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}
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/// <summary>
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/// Stop playback.
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/// </summary>
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public void StopTone()
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{
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_waveOut.Stop();
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}
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/// <summary>
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/// Dispose of resources.
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/// </summary>
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public void Dispose()
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{
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_waveOut.Dispose();
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}
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}
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}
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