Question

我在C＃-Application中使用NAudio，我的问题是播放速度取决于采样率。我使用了两个包含1000Hz正弦波的Wav文件，其中Fs = 44100Hz和Fs = 88200 Hz。我用示波器检查了声卡的输出信号。事实证明，我的Fs = 44100的文件在预期时间的一半后结束了，而输出频率却翻了一番（2kHz）。在其他播放器（例如Windows Media Player，Audacity）中使用文件时，一切看起来都很好。调试时，我查看了这些文件的Waveformat，一切看起来也都很好。我还改变了位分辨率，没有差异。我不确定我是否只是错过了什么。

我在第一次出现此问题的另一个程序中使用了它。因此，我做了一个基本的程序，看我是否在较大的应用程序中已经犯了一个错误，那里也存在相同的问题。

如果有人可以帮助我，那将是非常不错的事情，并受到高度赞赏。亲切的问候狮子座

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using NAudio.Wave;

namespace WindowsFormsApp2
{
    public partial class Form1 : Form
    {
        AsioOut asioOut;
        AudioFileReader afr4;
        AudioFileReader afr8;
        AudioFileReader afr0;
        MixingWaveProvider32 mwp;

        int playingID = 0;
        int channelID;
        Boolean audioplaying = false;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            asioOut = new AsioOut();
            afr4 = new AudioFileReader("../wavs/sin1000Hz_1.75s_16bit_44100Hz_ramp50ms.wav");
            afr8 = new AudioFileReader("../wavs/sin1000Hz_1.75s_16bit_88200Hz_ramp50ms.wav");
            afr0 = new AudioFileReader("../wavs/sin14607Hz_180sec_20msRamp_fs96000_24bit_mono_doppelt.wav");
            mwp  = new MixingWaveProvider32();



            afr4.Volume = 1.0f;
            afr8.Volume = 1.0f;

            for (int i = 0; i < asioOut.DriverOutputChannelCount; i++) {
                Console.WriteLine(i + ": " + asioOut.AsioOutputChannelName(i));
                if (asioOut.AsioOutputChannelName(i).Equals("Analog 3 (1)")) {
                    channelID = i;
                }
            }
            asioOut.ChannelOffset = channelID;
            asioOut.Init(mwp);
            asioOut.PlaybackStopped += OnPlaybackStopped;
        }

        //a button to play the Fs = 44100Hz File
        private void button1_Click(object sender, EventArgs e)
        {
            if (audioplaying == false) {
                mwp.AddInputStream(afr4);
                afr4.Position = 0;

                audioplaying = true;
                playingID = 4;

                asioOut.Play();
            }           
        }

        //a button to play the Fs = 88200Hz File
        private void button2_Click(object sender, EventArgs e)
        {
            if (audioplaying == false) {
                mwp.AddInputStream(afr8);
                afr8.Position = 0;

                audioplaying = true;
                playingID = 8;

                asioOut.Play();
            }
        }

        //a button to play just another audiofile
        private void button4_Click(object sender, EventArgs e)
        {
            if (audioplaying == false) {
                mwp.AddInputStream(afr0);
                afr0.Position = 0;

                audioplaying = true;
                playingID = 0;

                asioOut.Play();
            }
        }

        //after playback every Input gets removed again to setup for new playback
        protected virtual void OnPlaybackStopped(object sender, EventArgs e) {            
            if (playingID == 4) {
                mwp.RemoveInputStream(afr4);
            } else if (playingID == 8) {
                mwp.RemoveInputStream(afr8);
            } else {
                mwp.RemoveInputStream(afr0);
            }
            audioplaying = false;

        }

        private void button3_Click(object sender, EventArgs e)
        {
            asioOut.Stop();
        }       
    }
}

Answer 1

您不能使用MixingWaveProvider32将具有不同WaveFormat的流混合在一起。您需要选择一个WaveFormat并将其传递给构造函数。然后，您应该只添加具有WaveFormat的项目，尽管MixingWaveProvider32在您每次仅拥有一个项目时并没有强制执行该操作，

音频文件播放速度错误

1 个答案: