Opengl视频冻结

Question

我有一个IDS眼睛摄像头，并通过PBO进行捕获到OpenGL (OpenTK)。在我的开发者电脑上，它工作得很好，但在较慢的机器上，视频在一段时间后冻结。

代码分配内存通过opengl和映射到眼睛，所以相机保存处理后的图像在这里:

// Generate PBO and save id
GL.GenBuffers(1, out this.frameBuffer[i].BufferID);
// Define the type of the buffer.
GL.BindBuffer(BufferTarget.PixelUnpackBuffer, this.frameBuffer[i].BufferID);
// Define buffer size.
GL.BufferData(BufferTarget.PixelUnpackBuffer, new IntPtr(width * height * depth), IntPtr.Zero, BufferUsageHint.StreamDraw);
// Get pointer to by openGL allocated buffer and
// lock global with uEye.
this.frameBuffer[i].PointerToNormalMemory = GL.MapBuffer(BufferTarget.PixelUnpackBuffer, BufferAccess.WriteOnly);
this.frameBuffer[i].PointerToLockedMemory = uEye.GlobalLock(this.frameBuffer[i].PointerToNormalMemory);
// Unmap PBO after use.
GL.UnmapBuffer(BufferTarget.PixelUnpackBuffer);
// Set selected PBO to none.
GL.BindBuffer(BufferTarget.PixelUnpackBuffer, 0);
// Register buffer to uEye
this.Succeeded("SetAllocatedImageMem", this.cam.SetAllocatedImageMem(width, height, depth, this.frameBuffer[i].PointerToLockedMemory, ref this.frameBuffer[i].MemId));
// Add buffer to uEye-Ringbuffer
this.Succeeded("AddToSequence", this.cam.AddToSequence(this.frameBuffer[i].PointerToLockedMemory, this.frameBuffer[i].MemId));

将图像从pbo复制到纹理(纹理已创建并ok):

// Select PBO with new video image
GL.BindBuffer(BufferTarget.PixelUnpackBuffer, nextBufferId);
// Select videotexture as current
GL.BindTexture(TextureTarget.Texture2D, this.videoTextureId);
// Copy PBO to texture            
GL.TexSubImage2D(
    TextureTarget.Texture2D,
    0,
    0,
    0,
    nextBufferSize.Width,
    nextBufferSize.Height,
    OpenTK.Graphics.OpenGL.PixelFormat.Bgr,
    PixelType.UnsignedByte,
    IntPtr.Zero);
// Release Texture
GL.BindTexture(TextureTarget.Texture2D, 0);
// Release PBO
GL.BindBuffer(BufferTarget.PixelUnpackBuffer, 0);

也许有人能看出这个错误…大约6秒后，眼球事件不再传递任何图像。当我删除TexSubImage2D它工作得很好，但当然没有图像出现。有什么锁之类的东西吗?提前感谢- Thomas

Answer 1

这似乎是一个共享缓冲区问题。你可以尝试实现一个简单的队列机制来解决这个问题。

示例代码(不意味着工作):

queue< vector<BYTE> > frames;

…

frames.push(vector<BYTE>(frameBuffer, frameBuffer + frameSize));

…

// use frame here at GL.TexSubImage2D using frames.front()
frames.pop();

Answer 2

自己发现失败。只需将上面的StreamDraw代码替换为StreamRead。

GL.BufferData(BufferTarget.PixelUnpackBuffer, new IntPtr(width * height * depth), IntPtr.Zero, BufferUsageHint.StreamRead);