[mythtv-users] Mythtv analog audio HELP!
Ray Whiteman
ray.whiteman at consultant.com
Tue Dec 9 11:21:49 UTC 2008
Hello,
I have been battling with an analogue sound output problem for a couple
days with a new myth front end I put together using old hardware. It is
a clean install with back ports added to bring the FE up to my current
backend FE config. My objective is to get the FE to playback DVB-T and
PVR-150 sampled recordings via the FE to stereo speakers embedded in an
old 4:3 CRT TV. I have tried with and without .asoundrc files, and every
configuration of alsamixer I could think of as well as all the options
in mythfrontend audio configuration.
My last configuration, which I thought was the closest, was the below
configuration with the myth (Settings General > Audio) set to
ALSA:mixed-analog
I am not categorically sure that the analog output is working hardware
wise, I think it was, I just can't get a whimper out of it now.
Everything looks correct to me. Sorry for the spam. ANy help would be
seriously appreciated. I suspect this is something basic. :/
===================================================================
Hardware:
Asus P4P800-E
ALC850 sound (AC97)
===================================================================
Software:
Mythbuntu 7.10 with backports enabled (mythfrontend 0.21.20080304-1)
===================================================================
$sudo lspci -v
00:1f.5 Multimedia audio controller: Intel Corporation 82801EB/ER
(ICH5/ICH5R) AC'97 Audio Controller (rev 02)
Subsystem: ASUSTeK Computer Inc. Unknown device 812a
Flags: bus master, medium devsel, latency 0, IRQ 22
I/O ports at e800 [size=256]
I/O ports at ee80 [size=64]
Memory at f7fff800 (32-bit, non-prefetchable) [size=512]
Memory at f7fff400 (32-bit, non-prefetchable) [size=256]
Capabilities: [50] Power Management version 2
===================================================================
$ hwinfo --sound
21: PCI 1f.5: 0401 Multimedia audio controller
[Created at pci.296]
UDI: /org/freedesktop/Hal/devices/pci_8086_24d5
Unique ID: W60f.GwekzbCBmC6
SysFS ID: /devices/pci0000:00/0000:00:1f.5
SysFS BusID: 0000:00:1f.5
Hardware Class: sound
Model: "ASUSTeK 82801EB/ER (ICH5/ICH5R) AC'97 Audio Controller"
Vendor: pci 0x8086 "Intel Corporation"
Device: pci 0x24d5 "82801EB/ER (ICH5/ICH5R) AC'97 Audio Controller"
SubVendor: pci 0x1043 "ASUSTeK Computer Inc."
SubDevice: pci 0x812a
Revision: 0x02
Driver: "Intel ICH"
Driver Modules: "snd_intel8x0"
I/O Ports: 0xe800-0xe8ff (rw)
I/O Ports: 0xee80-0xeebf (rw)
Memory Range: 0xf7fff800-0xf7fff9ff (rw,non-prefetchable)
Memory Range: 0xf7fff400-0xf7fff4ff (rw,non-prefetchable)
IRQ: 22 (19576 events)
Module Alias: "pci:v00008086d000024D5sv00001043sd0000812Abc04sc01i00"
Driver Info #0:
Driver Status: snd_intel8x0 is active
Driver Activation Cmd: "modprobe snd_intel8x0"
Config Status: cfg=new, avail=yes, need=no, active=unknown
===================================================================
$ lsmod | grep snd
snd_intel8x0 34972 2
snd_ac97_codec 100644 1 snd_intel8x0
ac97_bus 3200 1 snd_ac97_codec
snd_pcm_oss 44672 0
snd_mixer_oss 17664 1 snd_pcm_oss
snd_pcm 80388 4 snd_intel8x0,snd_ac97_codec,snd_pcm_oss
snd_seq_dummy 4740 0
snd_seq_oss 33152 0
snd_seq_midi 9600 0
snd_rawmidi 25728 1 snd_seq_midi
snd_seq_midi_event 8448 2 snd_seq_oss,snd_seq_midi
snd_seq 53232 6
snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
snd_timer 24324 2 snd_pcm,snd_seq
snd_seq_device 9228 5
snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
snd 54660 13
snd_intel8x0,snd_ac97_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
soundcore 8800 1 snd
snd_page_alloc 11400 2 snd_intel8x0,snd_pcm
===================================================================
$dpkg -l \*alsa\* | grep ^ii
ii alsa-base 1.0.14-1ubuntu2 ALSA driver configuration files
ii alsa-utils 1.0.14-1ubuntu4 ALSA utilities
ii libesd-alsa0 0.2.38-0ubuntu4.1 Enlightened Sound Daemon
(ALSA) - Shared lib
ii libsdl1.2debian-alsa 1.2.11-9ubuntu2 Simple DirectMedia Layer
(with X11 and ALSA
ii xfce4-mixer-alsa 1:4.4.1-3ubuntu1 Xfce4 Mixer ALSA backend
===================================================================
$aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ICH5 [Intel ICH5], device 0: Intel ICH [Intel ICH5]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 0: ICH5 [Intel ICH5], device 4: Intel ICH - IEC958 [Intel ICH5 -
IEC958]
Subdevices: 1/1
Subdevice #0: subdevice #0
===================================================================
$ aplay -L
front:CARD=ICH5,DEV=0
Intel ICH5, Intel ICH5
Front speakers
surround40:CARD=ICH5,DEV=0
Intel ICH5, Intel ICH5
4.0 Surround output to Front and Rear speakers
surround41:CARD=ICH5,DEV=0
Intel ICH5, Intel ICH5
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=ICH5,DEV=0
Intel ICH5, Intel ICH5
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=ICH5,DEV=0
Intel ICH5, Intel ICH5
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
null
Discard all samples (playback) or generate zero samples (capture)
===================================================================
$ cat .asoundrc
# ~/.asoundrc or /etc/asound.conf
# ALSA configuration file
##### USAGE #####
# Save this file as "~/.asoundrc" (for user-specific sound configuration) or
# "/etc/asound.conf" (for system-wide sound configuration) and specify ALSA
# device names ad described in the next section.
##### DEVICE NAMES #####
# This configuration file defines four devices for use by the user. Those
# devices are "analog", "mixed-analog", "digital", and "mixed-digital". The
# user may also re-define "default" to be identical to one of the
above-named
# devices (i.e. to send all sound output to the digital output unless
otherwise
# specified). Use the device names as described below:
# - "analog" outputs to the analog output directly and (at least on
software
# sound cards) blocks other audio output. After playback completes,
"queued"
# sounds are output in sequence.
# - "mixed-analog" mixes audio output from multiple programs into the
analog
# output (so you can hear beeps, alerts, and other noises while playing
back
# an audio stream).
# - "digital" outputs to the digital output directly. Since most (all?)
# digital outputs expect 48kHz PCM audio, this may not work for some
playback
# (i.e. CD's--which are 44.1kHz PCM audio--or 32kHz audio streams from TV
# recordings, etc.).
# - "mixed-digital"
# All other devices created within this file are used only by the
configuration
# file itself and should /not/ be used directly. In other words, do not use
# the devices "analog-hw", "dmix-analog", "digital-hw", or "dmix-digital".
##### IMPORTANT #####
# To make this ALSA configuration file work with your sound card, you
will need
# to define the appropriate card and device information for the
"analog-hw" and
# "digital-hw" devices below. You can find the card and device information
# using "aplay -l".
##### Configuration File #####
# Override the default output used by ALSA. If you do not override the
# default, your default device is identical to the (unmixed) "analog" device
# shown below. If you prefer mixed and/or digital output, uncomment the
# appropriate four lines below (only one slave.pcm line).
#
# Note, also, that as of ALSA 1.0.9, "software" sound cards have been
modified
# such that their default "default" device is identical to the
"mixed-analog"
# device. Whether using an ALSA version before or after 1.0.9, it does
no harm
# and has no affect on performance to redefine the device (even if the
# redefinition does not change anything). Also, by using this ALSA
# configuration file, you once again have access to unmixed analog
output using
# the "analog" device.
pcm.!default {
type plug
## Uncomment the following to use (unmixed) "analog" by default
# slave.pcm "analog-hw"
## Uncomment the following to use "mixed-analog" by default
slave.pcm "dmix-analog"
## Uncomment the following to use (unmixed) "digital" by default
# slave.pcm "digital-hw"
## Uncomment the following to use "mixed-digital" by default
# slave.pcm "dmix-digital"
}
# Control device (mixer, etc.) for the card
ctl.!default {
type hw
card 0
}
# Alias for (converted) analog output on the card
# - This is identical to the device named "default"--which always exists and
# refers to hw:0,0 (unless overridden)
# - Therefore, we can specify "hw:0,0", "default", or "analog" to access
analog
# output on the card
# - Note that as of ALSA 1.0.9, "software" sound card definitions redefine
# "default" to do mixing, meaning this device is different from
"default" and
# allows playback while blocking other sound sources (until playback
# completes).
pcm.analog {
type plug
slave.pcm "analog-hw"
}
# Control device (mixer, etc.) for the card
ctl.analog {
type hw
card 0
}
# Alias for (converted) mixed analog output on the card
# - This will accept audio input--regardless of rate--and convert to the
rate
# required for the dmix plugin (in this case 48000Hz)
# - Note that as of ALSA 1.0.9, "software" sound card definitions redefine
# "default" to do mixing, meaning this device is identical to "default" for
# "software" sound cards.
pcm.mixed-analog {
type plug
slave.pcm "dmix-analog"
}
# Control device (mixer, etc.) for the card
ctl.mixed-analog {
type hw
card 0
}
# Alias for (converted) digital (S/PDIF) output on the card
# - This will accept audio input--regardless of rate--and convert to the
rate
# required for the S/PDIF hardware (in this case 48000Hz)
pcm.digital {
type plug
slave.pcm "digital-hw"
}
# Control device (mixer, etc.) for the card
ctl.digital {
type hw
card 0
}
# Alias for mixed (converted) digital (S/PDIF) output on the card
# - This will accept audio input--regardless of rate--and convert to
the rate
# required for the S/PDIF hardware (in this case 48000Hz)
pcm.mixed-digital {
type plug
slave.pcm "dmix-digital"
}
# Control device (mixer, etc.) for the card
ctl.mixed-digital {
type hw
card 0
}
# The following devices are not useful by themselves. They require specific
# rates, channels, and formats. Therefore, you probably do not want to use
# them directly. Instead use of of the devices defined above.
# Alias for analog output on the card
# Do not use this directly--it requires specific rate, channels, and format
pcm.analog-hw {
type hw
card 0
# The default value for device is 0, so no need to specify
# - Uncomment one of the below or create a new "device N" line as
appropriate
# for your sound card or
# device 1
# device 4
}
# Control device (mixer, etc.) for the card
ctl.analog-hw {
type hw
card 0
}
# Alias for digital (S/PDIF) output on the card
# Do not use this directly--it requires specific rate, channels, and format
pcm.digital-hw {
type hw
card 0
device 4
# - Comment out "device 1" above and uncomment one of the below or create a
# new "device N" line as appropriate for your sound card or
# device 2
# device 4
}
# Control device (mixer, etc.) for the card
ctl.digital-hw {
type hw
card 0
}
# Direct software mixing plugin for analog output on the card
# Do not use this directly--it requires specific rate, channels, and format
pcm.dmix-analog {
type dmix
ipc_key 1234
slave {
pcm "analog-hw"
period_time 0
period_size 1024
buffer_size 4096
rate 48000
}
}
# Control device (mixer, etc.) for the card
ctl.dmix-analog {
type hw
card 0
}
# Direct software mixing plugin for digital (S/PDIF) output on the card
# Do not use this directly--it requires specific rate, channels, and format
pcm.dmix-digital {
type dmix
ipc_key 1235
slave {
pcm "digital-hw"
period_time 0
period_size 1024
buffer_size 4096
rate 48000
}
}
# Control device (mixer, etc.) for the card
ctl.dmix-digital {
type hw
card 0
}
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