通过 directshow 创建了一个 UYVY 图像，它已损坏，我不知道为什么

Question

我有一个来自相机的 UYVY 数据缓冲区，我正在使用 GSSF Directshow.net 过滤器将缓冲区推送到图表中。

目前的图表是

GSSF -> YUV Transform -> AVI Splitter -> Video Renderer

图表正确计算颜色并正确显示它，但图像中存在不应该存在的条形图，我不确定它们来自哪里。盯着图像看我的眼睛很痛。

此函数获取 UYVY 缓冲区（主字节）并将其复制到整数数组

        unsafe public void ImageFromPixels__()
    {
        byte[] x = mainbyte;
        long fff = 720 * 1280;
        mainptr = new IntPtr(fff);
        for (int p = 0; p < 720 * 1280; p++)
        {
            U = (x[p * 4 + 0]);

            Y = (x[p * 4 + 1]);
            V = (x[p * 4 + 2]);
            Y2 = (x[p * 4 + 3]);

           // int one = V << 16 | Y << 8 | U;
           // int two = V << 16 | Y2 << 8 | U;
            int one = Y2 << 24 | V << 16 | Y << 8 | U;
           // mainint[p * 2 + 0] = one;
           // mainint[p * 2 + 1] = two;
            mainint[p] = one;

        }

        m_FPS = UNIT / 20;
        m_b = 211;
        m_g = 197;
    }

此函数获取相同的内容整数数组并将其打包到 GSSF 流指针中

        override unsafe public int GetImage(int iFrameNumber, IntPtr ip, int iSize, out int iRead)
    {
        int hr = 0;

        if (iFrameNumber>-1)
        {
            if (iFrameNumber < MAXFRAMES)
            {
                ImageFromPixels_(20, mainbyte);

                m_g += 3;
                m_b += 7;
                int* bp = (int*)ip.ToPointer();
                Random k = new Random();

                StreamReader s = new StreamReader("jpegFile.txt");
                for (int f = 0; f < HEIGHT; f++)
                {
                    for (int x = 0; x < (WIDTH); x += 1)
                    {
                        *(bp + (f * WIDTH) + x) = mainint[f * 1280 + x];
                    }
                }
            }
            else
            {
                hr = 1; // End of stream
            }
        }

        iRead = iSize;

        return hr;
    }

这为 GSSF 的输出引脚设置位图压缩 我想我可能在这里做错了什么，但看起来是正确的。

        override public void SetMediaType(IGenericSampleConfig psc)
    {
        BitmapInfoHeader bmi = new BitmapInfoHeader();

        // Build a BitmapInfo struct using the parms from the file
        bmi.Size = Marshal.SizeOf(typeof(BitmapInfoHeader));
        bmi.Width = WIDTH;
        bmi.Height = HEIGHT * -1;
        bmi.Planes = 1;
        bmi.BitCount = BPP;
        bmi.Compression = 0x59565955; //UYVY
        bmi.ImageSize = (bmi.BitCount / 8) * bmi.Width * bmi.Height;
        bmi.XPelsPerMeter = 0;
        bmi.YPelsPerMeter = 0;
        bmi.ClrUsed = 0;
        bmi.ClrImportant = 0;

        int hr = psc.SetMediaTypeFromBitmap(bmi, m_FPS);
        DsError.ThrowExceptionForHR(hr);
    }

更新 稍微改变一下

        override unsafe public int GetImage(int iFrameNumber, IntPtr ip, int iSize, out int iRead)
    {
        int hr = 0;

        if (iFrameNumber>-1)
        {
            if (iFrameNumber < MAXFRAMES)
            {
                ImageFromPixels_(20, mainbyte);

                m_g += 3;
                m_b += 7;
                int* bp = (int*)ip.ToPointer();
                Random k = new Random();
                StreamReader s = new StreamReader("jpegFile.txt");
                for (int f = 0; f < 720; f++)
                {
                    for (int x = 0; x < (1280); x += 1)
                    {
                        *(bp + (f * 1280) + x) = mainint[f * 1280 + x];
                    }
                }
            }
            else
            {
                hr = 1; // End of stream
            }
        }

// 覆盖 public void SetMediaType(IGenericSampleConfig psc) { BitmapInfoHeader bmi = new BitmapInfoHeader();

        // Build a BitmapInfo struct using the parms from the file
        bmi.Size = Marshal.SizeOf(typeof(BitmapInfoHeader));
        bmi.Width = WIDTH;
        bmi.Height = HEIGHT * -1;
        bmi.Planes = 1;
        bmi.BitCount = BPP;
        bmi.Compression = 0x59565955;
        bmi.ImageSize = (bmi.BitCount / 8) * bmi.Width * bmi.Height;
        bmi.XPelsPerMeter = 0;
        bmi.YPelsPerMeter = 0;
        bmi.ClrUsed = 0;
        bmi.ClrImportant = 0;

        int hr = psc.SetMediaTypeFromBitmap(bmi, m_FPS);
        DsError.ThrowExceptionForHR(hr);
    }

//

        unsafe public void ImageFromPixels_(long FPS, byte[] x)
    {

        long fff = 720 * 1280 * 3;
        mainptr = new IntPtr(fff);
        for (int p = 0; p < 720 * 640; p++)
        {
            U = (x[ p * 4 + 0]);

            Y = (x[p * 4 + 1]);
            V = (x[p * 4 + 2]);
            Y2 = (x[p * 4 + 3]);

            int one = Y2 << 24 | V << 16 | Y << 8 | U;
            //int one = V << 16 | Y << 8 | U;
            //int two = V << 16 | Y2 << 8 | U;
            //mainint[p * 2 + 0] = one;
            //mainint[p * 2 + 1] = two;
            mainint[p] = one;

        }

        m_FPS = UNIT / FPS;
        m_b = 211;
        m_g = 197;
    }

如果我更改 GetImage 中的其他数字来改变视频的高度，或者如果我更改它位于 ImagePixel 内部，然后我就得到黑屏：|

Answer 1

指针数学很糟糕。将我的代码从 更改

for (int f = 0; f < 720; f++)
{
    for (int x = 0; x < (1280); x += 1)
    {
        *(bp + (f * 1280) + x) = mainbyte[f * 1280 + x];
    }
}

为

Marshal.Copy(mainbyte, 0, ip, 1280*720);

并将 BPP 从 32 更改为 16，现在它可以顺利运行。

<_<

Answer 2

为什么你的循环达到（720 * 1280），这是图片中每个像素的一次迭代，但在循环内你正在做Y和Y2。看起来不对。