On 01/25/12 00:33, Alexander Motin wrote:
On 01/25/12 00:13, Mickaël Maillot wrote:2012/1/24 Alexander Motin <m...@freebsd.org <mailto:m...@freebsd.org>> Here is it: http://people.freebsd.org/~__mav/hda.HBR.patch <http://people.freebsd.org/~mav/hda.HBR.patch> It should activate HBR mode if you try to play stream with AC3 format and 8 channels (>6Mbps).no change with the patch because when i SNDCTL_DSP_SETFMT to AFMT_AC3, SNDCTL_DSP_CHANNELS always return 2 channels even if i set SNDCTL_DSP_SPEED to 192000. and i think it's why "if ((ch->fmt & AFMT_AC3) && (cchn == 8))" can't be true. i checked my /v/l/messages and saw PCMDIR_PLAY ....chan_count=0x01.Number of channels should be set to 8 by application when it expects bit rate above 6Mbps. Sample rate, as I've described, just give more fine control. Increasing sample rate does not automatically increase channels. They are orthogonal: Rate 48 96 192 48 96 192 Channels 2 2 2 8 8 8 ---------------------------------------------------------- Mbps 1.5 3 6 12 24 49 What I've forgot is to allow 8ch format. :) Add the patch below. Hope sound(4) has no other limitations for it.
Hmm. Looks like there is some limitation. You may grep kernel for AFMT_PASSTHROUGH and find two "XXX force ..." comments and code, including forcing 2 channels for AC3. Luckily for not part for frequency is commented out. Further we may try to comment or modify part about number of channels.
--- hdaa.c (revision 230511)
+++ hdaa.c (working copy)
@@ -4979,6 +4979,8 @@
}
if (HDA_PARAM_SUPP_STREAM_FORMATS_AC3(fmtcap)) {
ch->fmtlist[i++] = SND_FORMAT(AFMT_AC3, 2, 0);
+ if (channels >= 8)
+ ch->fmtlist[i++] = SND_FORMAT(AFMT_AC3, 8, 0);
}
ch->fmtlist[i] = 0;
i = 0;
But in your case I think it should be enough to just increase sample
rate to 96 or 192KHz.
-- Alexander Motin _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
