Date: Sun, 11 Mar 2007 14:10:54 +0100 From: "Chris Billington" <billington.chris@gmail.com> To: freebsd-multimedia@freebsd.org Subject: Mic boost (igain) for uaudio Message-ID: <6d0bead20703110610y60a4ba9fl69a7e566535bb294@mail.gmail.com>
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Hi,
I use a USB audio device (phone handset) for VOIP on 6.2-stable.
The audio from the USB device is really low level- correspondents can
hardly hear me.
The uaudio0 device appears as /dev/dsp1.0, /dev/dsp1.1, etc:
/dev/dsp1.0 /dev/dsp1.2 /dev/dsp1.4
/dev/dsp1.1 /dev/dsp1.3 /dev/dsp1.5
dmesg|grep pcm:
dmesg|grep pcm
timer: 0x000100ef therm: 0x00010000 err: 0x0001000f pcm: 0x00010000
pcm0: <Intel ICH6 (82801FB)> port 0xe000-0xe0ff,0xe400-0xe43f mem
0xffe3fc00-0xffe3fdff,0xffe3f800-0xffe3f8ff irq 17 at device 30.2 on
pci0
pcm0: Reserved 0x200 bytes for rid 0x18 type 3 at 0xffe3fc00
pcm0: Reserved 0x100 bytes for rid 0x1c type 3 at 0xffe3f800
pcm0: [MPSAFE]
pcm0: <Avance Logic ALC655 AC97 Codec (id = 0x414c4760)>
pcm0: Codec features 5 bit master volume, no 3D Stereo Enhancement
pcm0: Primary codec extended features reserved 1, center DAC, surround
DAC, LFE DAC, reserved 5
pcm0: ac97 codec dac ready count: 0
pcm0: sndbuf_setmap 1e469000, 4000; 0xd4f49000 -> 1e469000
pcm0: sndbuf_setmap 1e45f000, 4000; 0xd4f4d000 -> 1e45f000
pcm0: measured ac97 link rate at 47997 Hz, will use 48000 Hz
pcm1: <USB audio> on uaudio0
pcm1: using a default buffer size of 16384 bytes
# cat /dev/sndstat
FreeBSD Audio Driver (newpcm)
Installed devices:
pcm0: <Intel ICH6 (82801FB)> at io 0xffe3fc00, 0xffe3f800 irq 17 bufsz
16384 kld snd_ich (1p/1r/4v channels duplex default)
pcm1: <USB audio> at ? kld snd_uaudio (1p/1r/4v channels duplex)
For the onboard audio I can set mic boost on (I think, looking at ac97.c) bu
# mixer -f /dev/dsp0 igain 100
Setting the mixer igain from 100:100 to 100:100.
However for the /dev/dsp1 I get:
# mixer -f /dev/dsp1 igain 100
mixer: unknown device: igain
usage: mixer [-f device] [-s | -S] [dev [+|-][voll[:[+|-]volr]] ...
mixer [-f device] [-s | -S] recsrc ...
mixer [-f device] [-s | -S] {^|+|-|=}rec rdev ...
devices: pcm, mic
rec devices:
The usb audio device appears to mixer (and kmixer, etc) as two output
channels pcm and mic.
Is there any way to add igain (20dB mic boost) for USB audio?
regards
Chris
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