[dvblast-devel] Request new feature

[Georgi Chorbadzhiyski]

Do not top post if you want to get further replies from me. Thank you.

On 5/5/12 4:49 PM, Kompan Kolia wrote:
> 04.02.2012, 00:42, "Georgi Chorbadzhiyski"<gf at unixsol.org>:
>> On 03.2.2012 г. 11:21, Kompan Kolia wrote:
>>>   I would like to see a new feature.
>>>
>>>   Switching the broadcast encrypted stream.
>>>
>>>   If option is enable - Dvblast didn`t send scrambled stream to network
>>>   If option is disable - Dvblast send scrambled stream
>>>
>>>   Like VLC. If МДС can`t descramble stream, it does not send stream to network.
>>>
>>>   This feature needed for monitor some channel.
>>
>> If the stream is not descrambled the scrambling control bits are set to
>> encrypted. The simple hack bellow will get you more or less what you want
>> (even if decryption failed you'll still receive PSI tables). This feature
>> looks like a hack to me and personally I would not apply it without hearing
>> second opinion. Anyone?
>>
>> diff --git a/demux.c b/demux.c
>> index ba90687..f1e0a4f 100644
>> --- a/demux.c
>> +++ b/demux.c
>> @@ -431,6 +431,11 @@ static void demux_Handle( block_t *p_ts )
>>                    {
>>                        p_output->i_nb_errors++;
>>                        p_output->i_last_error = i_wallclock;
>> +                    if ( p_output->i_nb_errors<= MAX_ERRORS )
>> +                    {
>> +                        block_Delete( p_ts );
>> +                        return;
>> +                    }
>>                    }
>>                    else if ( i_wallclock>  p_output->i_last_error + WATCHDOG_WAIT )
>>                        p_output->i_nb_errors = 0;
>> @@ -445,6 +450,8 @@ static void demux_Handle( block_t *p_ts )
>>                                 "too many errors for stream %s, resetting",
>>                                 p_output->config.psz_displayname );
>>                        en50221_Reset();
>> +                    block_Delete( p_ts );
>> +                    return;
>>                    }
>>                }
 > This patch don`t work for me.
 >
 > Number of outgoing multicast packets remains unchanged.
 >
 > Сan you modify this patch to the network is not decrypted packets are not sent.

The error counter was the only way I could think of to detect that
the decryption is not working. If the CAM is able to report decryption
failure than the packets can be filtered, if not there is no way.

Why don't you try to stop using the CAM, install OSCAM [1] and if your card
is supported you may use tsdecrypt to decrypt the stream. If your card
is not supported by OSCAM, I can't think of a way to help you currently.

[1]: http://streamboard.gmc.to:8001/wiki  get svn trunk (not 1.0 it is too old).
[2]: http://streamboard.gmc.to:8001/wiki/CardsList
[3]: http://www.buydvb.net/tbs3102-5-crystal-phoenixsmartmouse-card-reader_p6.html

-- 
Georgi Chorbadzhiyski
http://georgi.unixsol.org/