On 04/07/2014 12:49 PM, Divneil Wadhawan wrote:
> Hi Pawel,
>
> Thanks for the quick response.
>
>> Is it possible that your userspace is not always queuing the same
>> userptr memory areas with the same v4l2_buffer index values?
> No, userptr is always consistent with the index.
> In fact, when we dump the captured buffer (Transport Stream) in this case,
> kernel space data and user-space are different.
> When that TS is played, macroblocks are observed from user-space and not from
> the kernel space dump.
> Although, user-space bad data is random, but, I have never seen kernel space
> dumped TS as bad.
>
>> In other words, if you have 2 buffers in use, under userspace mapping
>> at addr1 and addr2, if you queue addr1 with index=0 and addr2 with
>> index=1 initially,
>> you should always keep queuing addr1 with index=0 and never 1, etc.
> Yeah! this is the same rule which is being followed.
>
>> Also, what architecture are you running this on?
> ARM Cortex A9 SMP
Two more questions:
Which kernel version are you using?
Which capture driver are you using?
Regards,
Hans
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