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我正在使用 SampleGrabber 来获取音频数据，但是我的 BufferCB 方法没有被执行。我究竟做错了什么 ？

//add Sample Grabber
            IBaseFilter pSampleGrabber = (IBaseFilter)Activator.CreateInstance(Type.GetTypeFromCLSID(CLSID_SampleGrabber));
            hr = pGraph.AddFilter(pSampleGrabber, "SampleGrabber");
            checkHR(hr, "Can't add Sample Grabber");

        AMMediaType pSampleGrabber_pmt = new AMMediaType();
        //pSampleGrabber_pmt.majorType = MediaType.Audio;
        pSampleGrabber_pmt.subType = MediaSubType.PCM;
        pSampleGrabber_pmt.formatType = FormatType.WaveEx;
        pSampleGrabber_pmt.fixedSizeSamples = true;
        pSampleGrabber_pmt.formatSize = 18;
        pSampleGrabber_pmt.sampleSize = 2;

        WaveFormatEx pSampleGrabber_Format = new WaveFormatEx();
        pSampleGrabber_Format.wFormatTag = 1;
        pSampleGrabber_Format.nChannels = 1;
        pSampleGrabber_Format.nSamplesPerSec = 48000;
        pSampleGrabber_Format.nAvgBytesPerSec = 96000;
        pSampleGrabber_Format.nBlockAlign = 2;
        pSampleGrabber_Format.wBitsPerSample = 16;
        pSampleGrabber_pmt.formatPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(pSampleGrabber_Format));
        Marshal.StructureToPtr(pSampleGrabber_Format, pSampleGrabber_pmt.formatPtr, false);
        hr = ((ISampleGrabber)pSampleGrabber).SetMediaType(pSampleGrabber_pmt);
        DsUtils.FreeAMMediaType(pSampleGrabber_pmt);
        checkHR(hr, "Can't set media type to sample grabber");

        ISampleGrabber pGrabber = new SampleGrabber() as ISampleGrabber; 
        pGrabber = (ISampleGrabber)pSampleGrabber;
        pGrabber.SetCallback(null, 1);

我的 BufferCB 方法就像

public int BufferCB(double SampleTime, IntPtr pBuffer, int BufferLen)
        {

            return 0;
        }
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1 回答 1

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您创建并配置了一个实例pSampleGrabber，然后将回调附加到另一个未使用的空闲实例pGrabber。

你需要

pSampleGrabber as ISampleGrabber

代替

new SampleGrabber() as ISampleGrabber
于 2012-05-31T08:22:24.590 回答