[英]Playing sine wave for unknown time
我整天都在尋找一些教程或一段代碼,“只是”在“無限”時間內玩簡單的罪惡浪。 我知道這聽起來有點瘋狂。
但是我希望能夠及時更改音調頻率,例如增加音調頻率。 想象一下,我想播放音調A,然后以“ +5”頻率每3ms的頻率將其增大到C(這只是示例),不想有空閑的地方,停止音調。
可能嗎? 或者你能幫我嗎?
使用NAudio庫進行音頻輸出。
做筆記wave提供者:
class NotesWaveProvider : WaveProvider32
{
public NotesWaveProvider(Queue<Note> notes)
{
this.Notes = notes;
}
public readonly Queue<Note> Notes;
int sample = 0;
Note NextNote()
{
for (; ; )
{
if (Notes.Count == 0)
return null;
var note = Notes.Peek();
if (sample < note.Duration.TotalSeconds * WaveFormat.SampleRate)
return note;
Notes.Dequeue();
sample = 0;
}
}
public override int Read(float[] buffer, int offset, int sampleCount)
{
int sampleRate = WaveFormat.SampleRate;
for (int n = 0; n < sampleCount; n++)
{
var note = NextNote();
if (note == null)
buffer[n + offset] = 0;
else
buffer[n + offset] = (float)(note.Amplitude * Math.Sin((2 * Math.PI * sample * note.Frequency) / sampleRate));
sample++;
}
return sampleCount;
}
}
class Note
{
public float Frequency;
public float Amplitude = 1.0f;
public TimeSpan Duration = TimeSpan.FromMilliseconds(50);
}
開始播放:
WaveOut waveOut;
this.Notes = new Queue<Note>(new[] { new Note { Frequency = 1000 }, new Note { Frequency = 1100 } });
var waveProvider = new NotesWaveProvider(Notes);
waveProvider.SetWaveFormat(16000, 1); // 16kHz mono
waveOut = new WaveOut();
waveOut.Init(waveProvider);
waveOut.Play();
添加新的注釋:
void Timer_Tick(...)
{
if (Notes.Count < 10)
Notes.Add(new Note{Frecuency = 900});
}
ps此代碼僅是想法。 真正使用添加mt-locking等
使用NAudio和SineWaveProvider32: http ://mark-dot-net.blogspot.com/2009/10/playback-of-sine-wave-in-naudio.html
private WaveOut waveOut;
private void button1_Click(object sender, EventArgs e)
{
StartStopSineWave();
}
private void StartStopSineWave()
{
if (waveOut == null)
{
var sineWaveProvider = new SineWaveProvider32();
sineWaveProvider.SetWaveFormat(16000, 1); // 16kHz mono
sineWaveProvider.Frequency = 1000;
sineWaveProvider.Amplitude = 0.25f;
waveOut = new WaveOut();
waveOut.Init(sineWaveProvider);
waveOut.Play();
}
else
{
waveOut.Stop();
waveOut.Dispose();
waveOut = null;
}
}
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