Hi, Any comment for this ?
In my opinion v4l2 spec is not accurate in this topic. Because VIDIOC_REQBUFS describes count is only used in V4L2_MEMORY_MMAP as below. __u32 count The number of buffers requested or granted. This field is only used when memory is set to V4L2_MEMORY_MMAP. But there is no comment in QBUF and DQBUF part about index. So I am confused. If an index isn't needed, how to driver handle it ? Best regards, Jonghun Han, > -----Original Message----- > From: linux-media-ow...@vger.kernel.org [mailto:linux-media- > ow...@vger.kernel.org] On Behalf Of Jonghun Han > Sent: Saturday, December 11, 2010 2:10 PM > To: linux-media@vger.kernel.org > Subject: Should a index be passed on the fly with the VIDIOC_QBUF ioctl in > V4L2_MEMORY_USERPTR case ? > > Hi, > > I wonder that a index should be passed on the fly with the VIDIOC_QBUF > ioctl in V4L2_MEMORY_USERPTR case. > If it isn't needed, should driver return virtual address gotten from > application on the fly with the VIDIOC_DQBUF ioctl ? > > Best regards, > Jonghun Han, > -- > To unsubscribe from this list: send the line "unsubscribe linux-media" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
