[vdr] Not able to switch off comment for blind people in splitted Stereo Signal

C.Y.M syphir at syphir.sytes.net
Sat Mar 26 04:33:43 CET 2005


Oliver Endriss wrote:
> Klaus Schmidinger wrote:
> 
>>Tomahawk wrote:
>>
>>>I just switched over the german channel ARD showing a movie in 2 Channel 
>>>Audio.
>>>
>>>Channel A the normal Movie Audio
>>>Channel B the Audio for blind people
>>>
>>>Though I tried to switch it in the Audio Menu (Cursors left right for 
>>>left and right channel) nothing changed I always had to listen to the 
>>>descriptive Audio for blind people too.
>>>Because my digital audio receiver has no possibility to switch between 
>>>channel a or b.
>>>
>>>Shouldn't there be something implemented to switch the Audio Channel on 
>>>TV channles choosing not to use two audio pids for splitting the audio 
>>>modes but by splitting the Stereo Signal.
>>
>>I'd say the ARD has screwd up things.
>>They aren't broadcasting this correctly.
> 
> 
> Unfortunately, DVB standards are too difficult to implement for most
> channels. :P
> 
> If you own a FF card with Crystal audio chip [*], you may try this patch:
> 
> diff -p -u -r1.15 av7110_av.c
> --- linux/drivers/media/dvb/ttpci/av7110_av.c	17 Mar 2005 03:16:11 -0000	1.15
> +++ linux/drivers/media/dvb/ttpci/av7110_av.c	26 Mar 2005 02:38:29 -0000
> @@ -1230,14 +1236,20 @@ static int dvb_audio_ioctl(struct inode 
>  		switch(av7110->audiostate.channel_select) {
>  		case AUDIO_STEREO:
>  			audcom(av7110, AUDIO_CMD_STEREO);
> +			if (av7110->adac_type == DVB_ADAC_CRYSTAL)
> +				i2c_writereg(av7110, 0x20, 0x02, 0x49);
>  			break;
>  
>  		case AUDIO_MONO_LEFT:
>  			audcom(av7110, AUDIO_CMD_MONO_L);
> +			if (av7110->adac_type == DVB_ADAC_CRYSTAL)
> +				i2c_writereg(av7110, 0x20, 0x02, 0x4a);
>  			break;
>  
>  		case AUDIO_MONO_RIGHT:
>  			audcom(av7110, AUDIO_CMD_MONO_R);
> +			if (av7110->adac_type == DVB_ADAC_CRYSTAL)
> +				i2c_writereg(av7110, 0x20, 0x02, 0x45);
>  			break;
>  
>  		default:
> 
> 
> It will switch the *analog* output of the sound chip to L/stereo/R mode,
> which will even work if data is not encoded correctly.
> 
> [*] FF DVB-S Cards with Crystal chip:
> - rev 1.5
> - rev 1.6
> - some rev 2.1 boards
> - rev 2.2
> - rev 2.3
> 

Is this patch to be added to the cvs of the dvb-kernel?  Or was the reason it
was not added because some cards do not have the crystal chip?

Best Regards,



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