BASS.Net 一次创建频谱图(不播放音乐文件)
本文关键字:音乐 文件 播放 创建 Net 一次 BASS | 更新日期: 2023-09-27 18:36:46
我在这里找到的这段代码创建了给定文件的谱图,但它让我在播放和绘制频谱图时等待。
我需要修改此代码以立即创建频谱图,而无需播放文件。
提前谢谢。
public partial class Form1 : Form
{
private int _handle;
private int _pos;
private BASSTimer _timer;
private Visuals _visuals;
public Form1()
{
InitializeComponent();
}
private void timer_Tick(object sender, EventArgs e)
{
bool spectrum3DVoicePrint = _visuals.CreateSpectrum3DVoicePrint(_handle, pictureBox1.CreateGraphics(),
pictureBox1.Bounds, Color.Cyan, Color.Green,
_pos, false, true);
_pos++;
if (_pos >= pictureBox1.Width)
{
_pos = 0;
}
}
private void Form1_Load(object sender, EventArgs e)
{
string file = "..''..''mysong.mp3";
if (Bass.BASS_Init(-1, 44100, BASSInit.BASS_DEVICE_DEFAULT, Handle))
{
_handle = Bass.BASS_StreamCreateFile(file, 0, 0, BASSFlag.BASS_DEFAULT);
if (Bass.BASS_ChannelPlay(_handle, false))
{
_visuals = new Visuals();
_timer = new BASSTimer((int) (1.0d/10*1000));
_timer.Tick += timer_Tick;
_timer.Start();
}
}
}
}
这是我解决问题的方法。这个想法是你不应该听整个记录,你可以移动音频光标并在某些点评估频谱。
private Bitmap DrawSpectrogram(string fileName, int height, int stepsPerSecond)
{
Bass.BASS_Init(-1, 44100, BASSInit.BASS_DEVICE_DEFAULT, Handle);
int channel = Bass.BASS_StreamCreateFile(fileName, 0, 0, BASSFlag.BASS_DEFAULT);
long len = Bass.BASS_ChannelGetLength(channel, BASSMode.BASS_POS_BYTES); // the length in bytes
double time = Bass.BASS_ChannelBytes2Seconds(channel, len); // the length in seconds
int steps = (int)Math.Floor(stepsPerSecond * time);
Bitmap result = new Bitmap(steps, height);
Graphics g = Graphics.FromImage(result);
Visuals visuals = new Visuals();
Bass.BASS_ChannelPlay(channel, false);
for (int i = 0; i < steps; i++)
{
Bass.BASS_ChannelSetPosition(channel, 1.0 * i / stepsPerSecond);
visuals.CreateSpectrum3DVoicePrint(channel, g, new Rectangle(0, 0, result.Width, result.Height), Color.Black, Color.White, i, true, false);
}
Bass.BASS_ChannelStop(channel);
Bass.BASS_Stop();
Bass.BASS_Free();
return result;
}