You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
98 lines
2.9 KiB
98 lines
2.9 KiB
// SPDX-License-Identifier: AGPL-3.0-only
|
|
/**
|
|
* Digital Voice Modem - Desktop Dispatch Console
|
|
* AGPLv3 Open Source. Use is subject to license terms.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* @package DVM / Desktop Dispatch Console
|
|
* @license AGPLv3 License (https://opensource.org/licenses/AGPL-3.0)
|
|
*
|
|
* Copyright (C) 2024-2025 Caleb, K4PHP
|
|
*
|
|
*/
|
|
|
|
using NAudio.Wave;
|
|
|
|
namespace dvmconsole
|
|
{
|
|
/// <summary>
|
|
///
|
|
/// </summary>
|
|
public class ToneGenerator
|
|
{
|
|
private readonly int sampleRate = 8000;
|
|
private readonly int bitsPerSample = 16;
|
|
private readonly int channels = 1;
|
|
private WaveOutEvent waveOut;
|
|
private BufferedWaveProvider waveProvider;
|
|
|
|
/*
|
|
** Methods
|
|
*/
|
|
|
|
/// <summary>
|
|
/// Initializes a new instance of the <see cref="ToneGenerator"/> class.
|
|
/// </summary>
|
|
public ToneGenerator()
|
|
{
|
|
waveOut = new WaveOutEvent();
|
|
waveProvider = new BufferedWaveProvider(new WaveFormat(sampleRate, bitsPerSample, channels));
|
|
waveOut.Init(waveProvider);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Generate a sine wave tone at the specified frequency and duration.
|
|
/// </summary>
|
|
/// <param name="frequency">Frequency in Hz</param>
|
|
/// <param name="durationSeconds">Duration in seconds</param>
|
|
/// <returns>PCM data as a byte array</returns>
|
|
public byte[] GenerateTone(double frequency, double durationSeconds)
|
|
{
|
|
int sampleCount = (int)(sampleRate * durationSeconds);
|
|
byte[] buffer = new byte[sampleCount * (bitsPerSample / 8)];
|
|
|
|
for (int i = 0; i < sampleCount; i++)
|
|
{
|
|
double time = (double)i / sampleRate;
|
|
short sampleValue = (short)(Math.Sin(2 * Math.PI * frequency * time) * short.MaxValue);
|
|
|
|
buffer[i * 2] = (byte)(sampleValue & 0xFF);
|
|
buffer[i * 2 + 1] = (byte)((sampleValue >> 8) & 0xFF);
|
|
}
|
|
|
|
return buffer;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Play the generated tone through the speakers.
|
|
/// </summary>
|
|
/// <param name="frequency">Frequency in Hz</param>
|
|
/// <param name="durationSeconds">Duration in seconds</param>
|
|
public void PlayTone(double frequency, double durationSeconds)
|
|
{
|
|
byte[] toneData = GenerateTone(frequency, durationSeconds);
|
|
|
|
waveProvider.ClearBuffer();
|
|
waveProvider.AddSamples(toneData, 0, toneData.Length);
|
|
|
|
waveOut.Play();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Stop playback.
|
|
/// </summary>
|
|
public void StopTone()
|
|
{
|
|
waveOut.Stop();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Dispose of resources.
|
|
/// </summary>
|
|
public void Dispose()
|
|
{
|
|
waveOut.Dispose();
|
|
}
|
|
} // public class ToneGenerator
|
|
} // namespace dvmconsole
|