c# - 在C#中分别更改wave文件的左右音量

Question

我正在使用Wave文件(立体声文件)处理，在这里我想将系统音量设置为最大并使用滚动条更改Wave文件的声音。
即系统音量应为100％，并且我要在60dB到100dB的范围内播放波形文件，并且始终在波形文件的左声道和右声道音量不相同。 (左声道可播放60dB，右声道可播放70dB)。

为此，我使用CSCore音频库，因为我的项目是在C#上开发的。

// Creating the Wave source from the source file
IWaveSource waveSource = CodecFactory.Instance.GetCodec("C:\\SampleWave.wav");

WasAPIOut mWasAPIOutObj = new WasapiOut();

AudioEndOutputVolume aeovObj = AudioEndpointVolume.FromDevice(_soundOut.Device);

// Getting the maximum and minimum volume range of Wave source.
aeovObj.GetVolumeRange(out vMinDB, out vMaxDB, out vIncrDB);

// Setting the System Master Volume to maximum (100%)
aepv.SetMasterVolumeLevel(vMaxDB, Guid.Empty);

// I want to play the wave file in a loop, so pushing the wave file to loop stream
LoopStream stream = new LoopStream(waveSource);

mWasAPIOutObj.Initialize(stream);

在播放波形文件之前，我想将波形文件的左声道设置为60 dB，右声道设置为70dB，然后开始播放。

mWasAPIOutObj.Play();

mWasAPIOutObj.Volume属性仅采用0.0到1.0之间的单个值。这里不谈论任何 channel 。

我需要将音量设置为WaveSource级别吗？

我也已经通过NAudio音频库，但是无法解决此问题。

ArgumentOutOfRange异常的Stacktrace:

   at CSCore.SampleSourceBase.Read(Single[] buffer, Int32 offset, Int32 count)
   at SampleTool.VPWaveSource.Read(Single[] buffer, Int32 offset, Int32 count) in c:\****\*****\Projects\Sample Tool\Try\SampleTool\SampleTool\SoundManager.cs:line 308
   at CSCore.Streams.SampleConverter.SampleToIeeeFloat32.Read(Byte[] buffer, Int32 offset, Int32 count)
   at CSCore.WaveAggregatorBase.Read(Byte[] buffer, Int32 offset, Int32 count)
   at CSCore.Streams.LoopStream.Read(Byte[] buffer, Int32 offset, Int32 count)
   at CSCore.SoundOut.WasapiOut.FeedBuffer(AudioRenderClient renderClient, Byte[] buffer, Int32 numFramesCount, Int32 frameSize)
   at CSCore.SoundOut.WasapiOut.PlaybackProc(Object playbackStartedEventWaithandle)

谁能帮助我解决这个问题。

提前致谢。

Answer 1

您可以简单地创建一个新源:

class ChannelVolumeControlSource : SampleSourceBase
{
    public ChannelVolumeControlSource(ISampleSource source) : base(source)
    {
        if(source.WaveFormat.Channels != 2) 
            throw new ArgumentException("Source must have two channels.", "source");
    }

    //todo: add some validation -> make sure only values between 0 and 1 are allowed.
    public float VolumeLeft { get; set; }
    public float VolumeRight { get; set; }

    public override int Read(float[] buffer, int offset, int count)
    {
        int read = base.Read(buffer, offset, count);
        for (int i = 0; i < read; i+=2)
        {
            buffer[i] *= VolumeLeft;
            buffer[i + 1] *= VolumeRight;
        }

        return read;
    }
}

用法:

    var channelVolumeSourceControl = new ChannelVolumeControlSource(stream.ToSampleSource());
    mWasAPIOutObj.Initialize(channelVolumeSourceControl.ToWaveSource());

    //control the volume during playback by setting the volume properties
    channelVolumeSourceControl.VolumeLeft = 0.5f; //left channel 50%
    channelVolumeSourceControl.VolumeRight = 1.0f; //right channel 100%