Changing Video Channel Parameters at Run Time

Hello There:

I' using a TMS320DM648 evalutation board and my applicaton has to change video channel parameters at run time. I created the following function to do so:

Int configVideoCap(Uint8 channel, ChannelInfo *pCapChInfo)
{
   Int status;
   Uint8 i;

   // Stop video channel.
   status = FVID_control(pCapChInfo->chanHandle, VPORT_CMD_STOP, NULL);

   // Toggle port scaling parameter.
   staticCapParams[channel].scale ^= VPORT_SCALING_ENABLE;
 
   // Free current frame buffer.
   status |= FVID_freeBuffer(pCapChInfo->chanHandle, &(pCapChInfo->frame));

   // Free remaing frame buffers.
   for(i = 0; i < CAP_NUM_FRAME_BUF - 1; i++)
   {
      status |= FVID_dequeue(pCapChInfo->chanHandle, &(pCapChInfo->frame));
      status |= FVID_freeBuffer(pCapChInfo->chanHandle, &(pCapChInfo->frame));
   }

   // Change channel parameters.
   status |= FVID_control(pCapChInfo->chanHandle, VPORT_CMD_CONFIG_CHAN,
                         (Ptr)&staticCapParams[channel]);

   // Allocate and prime buffers again.
   for(i = 0; i < CAP_NUM_FRAME_BUF; i++)
   {
      status |= FVID_allocBuffer(pCapChInfo->chanHandle, &(pCapChInfo->frame));
      status |= FVID_queue(pCapChInfo->chanHandle, &(pCapChInfo->frame));

   }

   // Restart video channel.
   status |= FVID_control(pCapChInfo->chanHandle, VPORT_CMD_START, NULL);
  
   return(status);
}

It works fine the first time is called, however,  in the second time, FVID_dequeue() returns weired pointers which for sure do not contain any frame buffer. I'm using Normal mode.

If I comment out the following line:

   // Toggle port scaling parameter.
   //staticCapParams[channel].scale ^= VPORT_SCALING_ENABLE;

It works fine all the time.

I would appreciate if someone could help me to ping point the problem in the function provided or let me know what is the proper procedure to change the parameters.

Thanks;

Gabriel