Free audio volume software for linux

Polypaudio Volume Control (pavucontrol) is a simple GTK based volume control tool ("mixer") for the PulseAudio sound server.

In contrast to classic mixer tools this one allows you to control both the volume of hardware devices and of each playback stream seperately.

Per-Song Volume is a Perl script maintains a per-song volume information.

What it means is that a volume is associated with each song, which is recorded whenever the volume changes, and is restored to its last value when the song is played again.

This is useful if you have several songs which sound louder or softer than the rest.

To run this script you need perl 5 and DBD::SQLite (http://search.cpan.org/dist/DBD-SQLite/).

The file "$HOME/.kde/share/apps/amarok/scripts-data/per-song-volume.default-volume.txt" can optionally hold the default volume for playing the files (an integer from 0 to 100). The default setting for it is 40.

I hope you find this script useful!

Audio::ConvTools is a API to convert audio files from/to mp3 ogg and wav.

SYNOPSIS

use Audio::ConvTools;
use Audio::ConvTools qw/:DEFAULT :Tmp :Log/;

$status = ogg2mp3(file.ogg);
$status = ogg2wav(file.ogg);
$status = ogg2wav(in.ogg, out.wav);
$status = mp32ogg(file.mp3);
$status = mp32wav(file.mp3);
$status = mp32wav(in.mp3, out.wav);
$status = wav2ogg(file.wav);
$status = wav2ogg(in.wav, out.ogg);
$status = wav2mp3(file.wav);
$status = wav2mp3(in.wav, out.mp3);

Audio::ConvTools::logMsg(This is a log message);
Audio::ConvTools::errMsg(This is an error message);

$tmp = Audio::ConvTools::getTmpFile(.wav);
Audio::ConvTools::destroyTmpFile($tmp);

Audio::CD is a Perl interface to libcdaudio (cd + cddb).

SYNOPSIS

use Audio::CD ();
my $cd = Audio::CD->init;

Audio::CD provides a Perl interface to libcdaudio by Tony Arcieri, available from http://cdcd.undergrid.net/

Several classes provide glue for the libcdaudio functions and data structures.

Audio::CD Class ^

init

Initialize the Audio::CD object:
my $cd = Audio::CD->init;

stat

Stat the Audio::CD object, returns an Audio::CD::Info object.
my $info = $cd->stat;

cddb

Returns an Audio::CDDB object.
my $cddb = $cd->cddb;

play

Play the given cd track (defaults to 1).
$cd->play(1);

stop

Stop the cd.
$cd->stop;

pause

Pause the cd.
$cd->pause;

resume

Resume the cd.
$cd->resume;

eject

Eject the cd.
$cd->eject;

close

Close the cd tray.
$cd->close;

play_frames

$cd->play_frames($startframe, $endframe);

play_track_pos

$cd->play_track_pos($strarttrack, $endtrack, $startpos);

play_track

$cd->play_track($strarttrack, $endtrack);

track_advance

$cd->track_advance($endtrack, $minutes, $seconds);

advance

$cd->advance($minutes, $seconds);

get_volume

Returns an Audio::CD::Volume object.

my $vol = $cd->get_volume;

set_volume

$cd->set_volume($vol);

Audio::Mad is a Perl interface to the mad MPEG decoder library.

SYNOPSIS

use Audio::Mad qw(:all);

my $stream = new Audio::Mad::Stream();
my $frame = new Audio::Mad::Frame();
my $synth = new Audio::Mad::Synth();
my $timer = new Audio::Mad::Timer();
my $resample = new Audio::Mad::Resample(44100, 22050);
my $dither = new Audio::Mad::Dither();

my $buffer = join(, );
$stream->buffer($buffer);

FRAME: {
if ($frame->decode($stream) == -1) {
last FRAME unless ($stream->err_ok());

warn "decoding error: " . $stream->error();
next FRAME;
}

$synth->synth($frame);
my $pcm = $dither->dither($resample->resample($synth->samples()));

print $pcm;
next FRAME;
}

This module is an attempt to provide a perl interface to the MAD (MPEG Audio Decoder) library, written by Robert Leslie. It has been designed to be 100% object oriented, and to follow the MAD interface as closely as possible.

So far, most of the MAD library, plus two companion modules are provided as part of the interface. Seperate documentation is provided in perldoc for all of the modules in the Audio::Mad framework.

Volume.app is a small graphical software utility enabling quick and convenient control of a computers audio volume level. Volume.app is intended for use on Linux/Unix systems in conjunction with an X window manager that supports dockable applications ("dockapps") such as AfterStep, BlackBox, or Window Maker.

It is a refinement of an idea that first appeared in Timecops WMix: a user interface comprising a "knob" that can be interactively "turned" by clicking and dragging the mouse. I found this approach quite appealing, both from an aesthetic viewpoint, and (more importantly) from a user-interface perspective.

A handful of other dockapp volume control programs are out there, and I have tried many of them. An interface element present in most of these is some form of "slider" as the primary means of adjusting the volume. (A fictitious example may be seen at right). To my dismay, with this kind of interface, volume adjustments tended to be large and abrupt. Because the slider was so small, raising or lowering the volume "just a bit" required extremely careful control of the mouse-- a slip of the hand had the potential to spike the volume to full blast. (I have a set of Altec-Lansing ACS48 speakers which make this a rather unpleasant experience). This approach left much to be desired.

I longed for an alternative, and upon playing with WMix (pictured at left) I had found it. The knob was genius in that it provided a means of graphically adjusting the volume, as a slider would, without tying itself directly to the motion of the mouse. The basic mode of usage is identical: you click on the thing and drag the mouse up or down. However, with the knob, the range of motion need not be confined to the postage-stamp-sized area of the dockapp. The mouse travel needed to cover the entire range of volume settings can be made longer, on the order of the full height of the screen-- almost like a much larger, easier-to-use slider. No longer were precise movements needed to make volume adjustments!

Still, I found WMixs interface to be a bit busy (never was a fan of tiny little buttons) and the all-important knob was yet a rather small target to find with the mouse. So, I grabbed a copy of the WMix source code, and rebuilt it into a dockapp that had a much larger knob as its sole interface element. I dubbed it Volume.app, and have placed it here for the benefit of everyone.

Audio::DSP is a Perl interface to *NIX digital audio device.

SYNOPSIS

use Audio::DSP;

($buf, $chan, $fmt, $rate) = (4096, 1, 8, 8192);

$dsp = new Audio::DSP(buffer => $buf,
channels => $chan,
format => $fmt,
rate => $rate);

$seconds = 5;
$length = ($chan * $fmt * $rate * $seconds) / 8;

$dsp->init() || die $dsp->errstr();

# Record 5 seconds of sound
for (my $i = 0; $i < $length; $i += $buf) {
$dsp->read() || die $dsp->errstr();
}

# Play it back
for (;;) {
$dsp->write() || last;
}

$dsp->close();

Audio::DSP is built around the OSS (Open Sound System) API and allows perl to interface with a digital audio device. It provides, among other things, an initialization method which opens and handles ioctl messaging on the audio device file. Audio::DSP also provides some rudimentary methods for the storage and manipulation of audio data in memory.

In order to use Audio::DSP, youll need to have the necessary OSS drivers/libraries installed. OSS is available for many popular Unices, and a GPLed version (with which this extension was initially developed and tested) is distributed with with the Linux kernel.