Date: Tue, 13 Jan 2009 09:25:14 +0200 From: Alexander Motin <mav@FreeBSD.org> To: Christian Weisgerber <naddy@mips.inka.de> Cc: freebsd-multimedia@freebsd.org Subject: Re: snd_hda, mplayer, and S/PDIF pass-through Message-ID: <496C41DA.4030201@FreeBSD.org> In-Reply-To: <1231806185.00059899.1231794002@10.7.7.3> References: <1231806185.00059899.1231794002@10.7.7.3>
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Christian Weisgerber wrote:
> FreeBSD 8.0-CURRENT box with snd_hda audio.
>
> Since I recently got an AV receiver that supports AC3 and DTS
> decoding, I had to try S/PDIF pass-through. I followed the suggestions
> mav@ had previously provided here:
> * disable vchans (sysctl dev.pcm.2.play.vchans=0)
> * mixer vol 100 pcm 100
>
> With this, "mplayer -ac hwac3" (or -ac hwdts) starts playing AC3
> (DTS) audio tracks from DVD just fine, i.e., they are passed through
> the S/PDIF interface to the receiver which decodes them and confirms
> this with various status messages.
>
> However, once the audio stream is interrupted, e.g. by pausing
> playback, it cannot be restarted. mplayer resumes... and the
> receiver misdetects the audio as PCM 48 and produces the corresponding
> noise.
>
> Any ideas what's going there?
It looks like mplayer bug, it does not sets sample rate on resume.
Attached patch fixes it for me.
--
Alexander Motin
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filename="ao_oss.c.patch"
--- ao_oss.c.prev 2007-10-07 22:49:27.000000000 +0300
+++ ao_oss.c 2008-11-29 21:51:21.000000000 +0200
@@ -433,6 +433,7 @@ static void reset(void){
fcntl(audio_fd, F_SETFD, FD_CLOEXEC);
#endif
+ ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_data.samplerate);
oss_format = format2oss(ao_data.format);
ioctl (audio_fd, SNDCTL_DSP_SETFMT, &oss_format);
if(ao_data.format != AF_FORMAT_AC3) {
@@ -442,7 +443,6 @@ static void reset(void){
int c = ao_data.channels-1;
ioctl (audio_fd, SNDCTL_DSP_STEREO, &c);
}
- ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_data.samplerate);
}
}
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