diff options
Diffstat (limited to 'mpfade')
| -rwxr-xr-x | mpfade | 118 |
1 files changed, 118 insertions, 0 deletions
@@ -0,0 +1,118 @@ +#!/usr/bin/perl +use strict; +use warnings; +use Audio::MPD q{0.19.0}; + +=head1 NAME + +mpfade - fade mpd volume in or out + +=head1 SYNOPSIS + +mpfade [minutes] [max|min] [host] + +=head1 DESCRIPTION + +B<mpfade> behaves differently depending on whether mpd is playing or not. + +If mpd is not playing (or is paused), it starts it playing at a low volume, +and gradually cranks the volume up to the specified B<max> value (default +50) over the specified number of minutes (default 10). + +If mpd is already playing, it works in reverse, reducing the volume over +time until it's a the specified B<min> (defaults to a tenth of what it was +at the start). Then it stops playing. + +B<mpfade> tries to interact well with manual volume changes you make. If +the volume is fading up, and you change the volume manually, it stops. This +is intended to be useful when used as an alarm clock. If the volume is +fading down, changes you make to the volume will be noticed, and the fade +down will continue from that point. + +The B<minutes> value can be a floating point value. If the hostname is +omitted, the MPD_HOST environment variable will be used. + +=head1 AUTHOR + +Copyright 2007 Joey Hess <joey@kitenet.net> + +Licensed under the GNU GPL version 2 or higher. + +http://kitenet.net/~joey/code/mpdtoys + +=cut + +my $seconds=60 * 10; +if (@ARGV && $ARGV[0] =~ /^[0-9.]+$/) { + $seconds=60 * shift; +} +my $endpoint; +if (@ARGV && $ARGV[0] =~ /^[0-9.]+$/) { + $endpoint=shift; +} + +if (@ARGV) { + $ENV{MPD_HOST}=shift; +} + +my $mpd=Audio::MPD->new(conntype => "reuse"); +my $vol=$mpd->status->volume; +if ($mpd->status->state eq 'play') { + if (defined $endpoint) { + if ($endpoint >= $vol) { + die "error: min ($endpoint) is not less than current volume ($vol)\n"; + } + } + else { + $endpoint=int($vol / 10); + } + print "fading down from $vol to $endpoint over $seconds seconds\n"; + fade($endpoint, $seconds); + $mpd->stop; +} +else { + if (! defined $endpoint) { + $endpoint=50; + } + $mpd->volume($vol=0); + print "fading up from $vol to $endpoint over $seconds seconds\n"; + $mpd->play; + fade($endpoint, $seconds); +} + +sub fade { + my $endpoint=shift; + my $seconds=shift; + + if ($seconds < 1) { + $mpd->volume($endpoint); + return; + } + + my $span=$endpoint - $vol; + my $oldvol=$vol; + my $curvol; + + # TODO calculate how long to optimally sleep + + while (sleep 1) { + $curvol=$mpd->status->volume; + if ($curvol != $oldvol) { + if ($span > 0) { + print "manual volume change, aborting fade up\n"; + return; + } + else { + print "manual volume change\n"; + $vol=$curvol; + } + } + + $vol=$vol + ($span / $seconds); + last if abs($vol - $endpoint) <= 1; + if (abs(int($vol - $oldvol)) > 1) { + $mpd->volume(int($vol)); + $oldvol=int($vol); + } + } +} |