[linux-dvb] Length of /dev/dvb/adapter0/dvr0's buffer.

[linux-dvb] Length of /dev/dvb/adapter0/dvr0's buffer.

[Andrea]

Hi,

I'm trying to read from /dev/dvb/adapter0/dvr0.
The problem is that the process reading sometimes is not fast enough and after a while I get errno 
75 when I try to read from it.

On average the speed is ok, so it should work.
There must be a buffer behind dvr0 that goes in error onece it is full.

1) how can I make it bigger?
2) how can I check how full it is?

Andrea

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[linux-dvb] RE : Length of /dev/dvb/adapter0/dvr0's buffer.

[Thierry Lelegard]

> I'm trying to read from /dev/dvb/adapter0/dvr0.
> The problem is that the process reading sometimes is not fast enough and after a while I get errno 
> 75 when I try to read from it.
>
> On average the speed is ok, so it should work.
> There must be a buffer behind dvr0 that goes in error onece it is full.
>
> 1) how can I make it bigger?
> 2) how can I check how full it is?

You can set the *demux* buffer size, upstream from dvr, using ioctl DMX_SET_BUFFER_SIZE.
The default value is 8 kB. Using 1 MB, I can do full TS capture without any loss. 


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Re: [linux-dvb] RE : Length of /dev/dvb/adapter0/dvr0's buffer.

[Andrea]

Thierry Lelegard wrote:
>> I'm trying to read from /dev/dvb/adapter0/dvr0.
>> The problem is that the process reading sometimes is not fast enough and after a while I get errno 
>> 75 when I try to read from it.
>>
>> On average the speed is ok, so it should work.
>> There must be a buffer behind dvr0 that goes in error onece it is full.
>>
>> 1) how can I make it bigger?
>> 2) how can I check how full it is?
> 
> You can set the *demux* buffer size, upstream from dvr, using ioctl DMX_SET_BUFFER_SIZE.
> The default value is 8 kB. Using 1 MB, I can do full TS capture without any loss. 
> 
> 

I've noticed that there are 2 ioctl DMX_SET_BUFFER_SIZE, one for the demux, one for the dvr.
The second is not implemented.

switch (cmd) {
case DMX_SET_BUFFER_SIZE:
         // FIXME: implement
         ret = 0;
         break;

Could you please help me:

1) how many ringbuffers are there?
2) I'm reading from dvr, which one do I need to set?
3) I can try to implement the above code if needed.

Cheers

Andrea



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