v4l2src question, is a frame returned with error (EIO) from dqbuf ioctl sent back to driver?

[yiliang]

Hi,

In gst_v4l2_buffer_pool_dqbuf, if the following system call return a buffer, but with an error such as -EIO, will v4l2src re-queue the buffer to driver?

  if (v4l2_ioctl (pool->video_fd, VIDIOC_DQBUF, &buffer) >=0) {
  }

Thanks,
Yiliang

[Stefan Sauer]

Am 25.03.2010 11:35, schrieb yiliang:
>
> Hi,
>
> In gst_v4l2_buffer_pool_dqbuf, if the following system call return a buffer,
> but with an error such as -EIO, will v4l2src re-queue the buffer to driver?

yes.

Stefan
>
>   if (v4l2_ioctl (pool->video_fd, VIDIOC_DQBUF, &buffer) >=0) {
>   }
>
> Thanks,
> Yiliang
>


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[yiliang]

Hi Stefen,

This is quite strange. In a v4l2 driver I am testing, if I set the frame buffer state to VIDEOBUF_ERROR instead of VIDEOBUF_DONE when a DMA error is detected, some buffers are lost and never sent back through qbuf ioctl again. If I ignore the error, the driver runs fine. Let me check it again.

Thanks!
Yiliang

On Thu, Mar 25, 2010 at 1:30 PM, Stefan Kost <[hidden email]> wrote:

Am 25.03.2010 11:35, schrieb yiliang:
>

> Hi,
>
> In gst_v4l2_buffer_pool_dqbuf, if the following system call return a buffer,
> but with an error such as -EIO, will v4l2src re-queue the buffer to driver?

yes.

Stefan

>
>   if (v4l2_ioctl (pool->video_fd, VIDIOC_DQBUF, &buffer) >=0) {
>   }
>
> Thanks,
> Yiliang
>

------------------------------------------------------------------------------
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