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

Oliver Endriss o.endriss at gmx.de
Sat Mar 26 04:01:07 CET 2005


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

Oliver

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