28 Jan
2004
28 Jan
'04
1 a.m.
Hi,
Are there tools to copy audio to a file as it goes through ALSA to the
soundcard? I'm basically looking for something like VSound, but for
everything, not just apps that can be coaxed to use OSS.
If not, would there be a way to implement such a tool without resorting to
vsound-style LD_PRELOAD hacks?
Thanks,
--
Tom Felker, <tcfelker(a)mtco.com>
<http://vlevel.sourceforge.net> - Stop fiddling with the volume knob.
If you destroy me, I shall become more powerful than you can possibly imagine.
-- Obi-Wan
28 Jan
28 Jan
3:45 a.m.
'arecord' from the alsa-utils package can do that. set the mixer as the
capture device, and off you go.
On Tue, Jan 27, 2004 at 10:57:02PM -0600, Tom Felker wrote:
Hi,
Are there tools to copy audio to a file as it goes through ALSA to the
soundcard? I'm basically looking for something like VSound, but for
everything, not just apps that can be coaxed to use OSS.
If not, would there be a way to implement such a tool without resorting to
vsound-style LD_PRELOAD hacks?
Thanks,
--
Tom Felker, <tcfelker(a)mtco.com>
<http://vlevel.sourceforge.net> - Stop fiddling with the volume knob.
If you destroy me, I shall become more powerful than you can possibly imagine.
-- Obi-Wan
5:15 a.m.
New subject: [linux-audio-dev] vlevel ? [was: Re: Vsound-like tools for ALSA?]
Tom Felker wrote:
Hi,
Are there tools to copy audio to a file as it goes through ALSA to the
soundcard? I'm basically looking for something like VSound, but for
everything, not just apps that can be coaxed to use OSS.
If not, would there be a way to implement such a tool without resorting to
vsound-style LD_PRELOAD hacks?
Thanks,
--
Tom Felker, <tcfelker(a)mtco.com>
<http://vlevel.sourceforge.net> - Stop fiddling with the volume knob.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
hey. this might be just what i'm looking for. was this thing ever
announced anywhere ?
--
"I never use EQ, never, never, never. I previously used to use mic
positioning but I've even given up on that too."
- Jezar on http://www.audiomelody.com
Jörn Nettingsmeier
Kurfürstenstr 49, 45138 Essen, Germany
http://spunk.dnsalias.org (my server)
http://www.linuxaudiodev.org (Linux Audio Developers)
6:14 a.m.
New subject: [linux-audio-dev] vlevel ? [was: Re: Vsound-like tools for ALSA?]
On Wed, 28 Jan 2004 10:11:43 +0100
Joern Nettingsmeier <nettings(a)folkwang-hochschule.de> wrote:
I never saw it either. Gonna test it with some movies [with too much
dynamics]..
Flo
--
signature :)
Are there
tools to copy audio to a file as it goes through ALSA to
the soundcard? I'm basically looking for something like VSound, but
for everything, not just apps that can be coaxed to use OSS.
If not, would there be a way to implement such a tool without
resorting to vsound-style LD_PRELOAD hacks?
Thanks,
--
Tom Felker, <tcfelker(a)mtco.com>
<http://vlevel.sourceforge.net> - Stop fiddling with the volume
knob.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
hey. this might be just what i'm looking for. was this thing ever
announced anywhere ? 
5:45 a.m.
On Tue, 27 Jan 2004 22:57:02 -0600
Tom Felker <tcfelker(a)mtco.com> wrote:
Hi,
Are there tools to copy audio to a file as it goes through ALSA to the
soundcard? I'm basically looking for something like VSound, but for
everything, not just apps that can be coaxed to use OSS.
If not, would there be a way to implement such a tool without
resorting to vsound-style LD_PRELOAD hacks?
(Disclaimer: I've not used this very much at all - I did knock up a
quick test :)
The ALSA file plugin can do this.
Try putting this in ~/.asoundrc:
pcm.fileout {
type file
slave.pcm "hw:0,0"
file alsaout.raw
}
..then aplay -D fileout foo.wav
will create a file called alsaout.raw
Of course, in that case it's easier to just cp foo.wav!
It's likely you'll want to record the output from realplayer or
something. If you have OSS emulation set in ALSA, try adding this to the
same .asoundrc:
pcm.dsp0 {
type plug
slave.pcm "fileout"
}
then
# aoss realplay
*should* record realplay output to the same fileout.raw
(Note: aoss uses LD_PRELOAD hackery)
Quite how you determine the format of the .raw file is beyond me -
anybody?!
-
Myk
7:34 a.m.
On Wed, 28 Jan 2004 07:42 pm, Mike Rawes wrote:
> Are there tools to copy audio to a file as it
goes through ALSA to the
> soundcard? I'm basically looking for something like VSound, but for
> everything, not just apps that can be coaxed to use OSS.
Try putting this in ~/.asoundrc:
pcm.fileout {
type file
slave.pcm "hw:0,0"
file alsaout.raw
}
..then aplay -D fileout foo.wav, will create a file called alsaout.raw
... and, how would one go about doing this for pmidi, an
ALSA app that does not support the -D option ?
And is it safe to presume this file will get created in
the current directory ?
Quite how you determine the format of the .raw file is
beyond me -
anybody?!
Good point, anyone know of a tool that simply determines
the filetype ?
--markc
11:06 a.m.
Mark Constable wrote:
On Wed, 28 Jan 2004 07:42 pm, Mike Rawes wrote:
pmidi plays MIDI events, not PCM data. You have to record the output
of the synthesizer to get PCM data.
pcm.fileout {
type file
slave.pcm "hw:0,0"
file alsaout.raw
}
..then aplay -D fileout foo.wav, will create a file called alsaout.raw
... and, how would one go about doing this for pmidi, an
ALSA app that does not support the -D option ? And is it safe to presume this file will get created
in
the current directory ?
Yes. The definition is read by the ALSA library, which is part of the
process of whatever program that is using the ALSA device.
> Quite how you determine the format of the .raw
file is beyond me -
> anybody?!
.raw files don't have any header, so you have to guess. (The sample
format is almost always S16_LE, but for the number of channels (mostly
1 or 2) or the sample rate, you have to try until it doesn't sound too
bad. ;-)
HTH
Clemens
11:50 a.m.
> Quite how
you determine the format of the .raw file is beyond me -
> anybody?!
.raw files don't have any header, so you have to guess. (The sample
format is almost always S16_LE, but for the number of channels (mostly
1 or 2) or the sample rate, you have to try until it doesn't sound too
bad. ;-) 
12:14 p.m.
On Wed, Jan 28, 2004 at 07:46:38 -0800, Lance Blisters wrote:
I've also wished for a tool which analyzed raw audio data. Shouldn't
be too difficult to try all common formats (word size, signed/unsigned,
big/little endian) and measure average volume and continuity to determine
which formats yield a reasonable waveform. Tool might fail on samples
Audacity had/has a raw importer which showwed a small graph of the
waveform and you could try different combos.
- Steve
> Quite how you determine the format of the .raw
file is beyond me -
> anybody?!
.raw files don't have any header, so you have to guess. (The sample
format is almost always S16_LE, but for the number of channels (mostly
1 or 2) or the sample rate, you have to try until it doesn't sound too
bad. ;-) 
14 Feb
14 Feb
8:38 p.m.
Hello,
I realize this is a bit belated for the thread, but there are such an
audio application to convert between file formats. I admit that I
haven't used any of them, so bear in mind that I cannot vouch for the
effectiveness of any of these applications.
SoX
The Swiss Army Knife of sound processing utils. It can convert audio
files to other popular audio file types and also apply sound effects and
filters during the conversion.
GNUShoes
A wrapper for the SoX audio utility. Written in Perl for Linux and
Win32, GNU/Shoes aids the tedious process of converting large numbers of
audio files, and will soon provide Jabber messages to notify the user
that a batch is complete.
There are also a few front-end listed on the site as well.
christopher
Note: All of this information was taken directly from the SourceForge.net.
Lance Blisters wrote:
I've also wished for a tool which analyzed raw audio data. Shouldn't
be too difficult to try all common formats (word size, signed/unsigned,
big/little endian) and measure average volume and continuity to determine
which formats yield a reasonable waveform. Tool might fail on samples
of white noise, but should easily succeed in 99% of cases. The tool could
even try different bit/byte alignments (skipping 0,1,2,...15 bits at
the beginning), to recover fragments of files which might not start at
an even sample. Number of channels and sampling rate might need to be
tuned by hand, but that's a simple matter once the other parameters
are correct.
Surely this must exist, maybe in the windows or mac universe?
-geoff
>Quite how you determine the format of the .raw file
is beyond me -
>anybody?!
>
>
.raw files don't have any header, so you have to guess. (The sample
format is almost always S16_LE, but for the number of channels (mostly
1 or 2) or the sample rate, you have to try until it doesn't sound too
bad. ;-)
9:18 p.m.
SoX
The Swiss Army Knife of sound processing utils. It can convert audio
files to other popular audio file types and also apply sound effects and
filters during the conversion.
as much as i love sox, its too bad that it can't read WAV files in
IEEE float format let alone Broadcast WAVE. if it used libsndfile, i
believe it could ...
10:26 p.m.
On Sat, 14 Feb 2004 20:14:04 -0500
Paul Davis <paul(a)linuxaudiosystems.com> wrote:
In the examples/ directory of the libsndfile source tarball there's a
program called sndfile-convert which does handle IEE float formats.
Unfortunately, it doesn't handle raw files yet, but all thats required
to do that is the addition of some command line parameter parsing.
Erik
--
+-----------------------------------------------------------+
Erik de Castro Lopo nospam(a)mega-nerd.com (Yes it's valid)
+-----------------------------------------------------------+
"One World, one Web, one Browser." - Microsoft promotion
"Ein Volk, ein Reich, ein Fuhrer." - Adolf Hitler
SoX
The Swiss Army Knife of sound processing utils. It can convert audio
files to other popular audio file types and also apply sound effects and
filters during the conversion.
as much as i love sox, its too bad that it can't read WAV files in
IEEE float format let alone Broadcast WAVE. if it used libsndfile, i
believe it could ...
28 Jan
28 Jan
12:57 p.m.
On Thu, 29 Jan 2004 01:02 am, Clemens Ladisch wrote:
Right, so the synth output is going to be PCM at some stage
(I presume) and shunted to the output devices... surely we
can sneak in there somehow with some dmix magic, or whatever,
and squirrel away a copy of that PCM output to a file ?
I'm particularly thinking of a SBlive with a loaded soundfont
(now that Takashi is kind enough to have given us an asfxload :)
Woops, I kinda hijacked this thread, I hope the original poster
is happy with his answers so far.
--markc
... and, how
would one go about doing this for pmidi, an
ALSA app that does not support the -D option ?
pmidi plays MIDI events, not PCM data. You have to record the output
of the synthesizer to get PCM data.
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days inactive
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linux-audio-dev@lists.linuxaudio.org
12 comments
12 participants
participants (12)
-
Clemens Ladisch -
Erik de Castro Lopo -
Florian Schmidt -
Grubs Nubby -
Joern Nettingsmeier -
Lance Blisters -
Mark Constable -
Mike Rawes -
Paul Davis -
Steve Harris -
Tom Felker -
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