[linux-dvb] Re: VDR and DVD with pause -> noise corrupt

[Andreas Schultz <aschultz@warp10.net>]

Hi,

Andreas Vitting wrote:
> if you change in dvbapi.c
> 
> void cPlayBuffer::Pause(void)
> {
>   paused = ! paused;
> ---  bool empty = fastForw......
> +++  bool empty = fastForward || fastRewind || !paused; +++
> 
> and
> 
> void cPlayBuffer::Play(void)
> {
>   if (fastForward || fastRewind || paused) {
> ---    bool empty = !paused || fastRe....
> +++    bool empty = !paused || fastRewind || (paused && fastForward ||
> !fastRewind); +++
> 
> then the pause->pause and pause->play buttons are working together with
> ac3dec.
> 
> But why ?? Why it's working if i clear the audio buffer ??

Because then no audio data is feed to the card anymore, the real problem 
has somewhat to do with the audio muting. If you apply the patch, the 
noise will go away.

--- vdr-0.91/dvbapi.c   Sun Aug 12 17:09:42 2001
+++ vdr-devel-0.91/dvbapi.c     Sun Aug 12 22:54:31 2001
@@ -752,7 +752,7 @@
       Empty(true);
    fastForward = fastRewind = false;
    CHECK(ioctl(videoDev, paused ? VIDEO_FREEZE : VIDEO_CONTINUE));
-  CHECK(ioctl(audioDev, AUDIO_SET_MUTE, paused));
+  //CHECK(ioctl(audioDev, AUDIO_SET_MUTE, paused));
    still = false;
    if (empty)
       Empty(false);
@@ -767,7 +767,7 @@
       still = false;
       CHECK(ioctl(videoDev, paused ? VIDEO_CONTINUE : VIDEO_PLAY));
       CHECK(ioctl(audioDev, AUDIO_SET_AV_SYNC, true));
-     CHECK(ioctl(audioDev, AUDIO_SET_MUTE, false));
+     //     CHECK(ioctl(audioDev, AUDIO_SET_MUTE, false));
       if (empty)
          Empty(false);
       fastForward = fastRewind = paused = false;

My guess is, that the audio frames get out of sync because they contain 
not time stamp. Maybe frames like that are not allowed or it's a driver bug?

Klaus: Is the muting really needed for normal VDR playback? I can't hear 
a difference with or without it.

Have fun

     Andreas

> 
> Andreas




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