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fb6fb0dedb
This script uses the flite source to produce files suitable to test channels order and layout.
115 lines
3.4 KiB
Perl
Executable File
115 lines
3.4 KiB
Perl
Executable File
#!/usr/bin/env perl
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# Copyright (c) 2012 Nicolas George
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#
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# This file is part of FFmpeg.
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#
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# FFmpeg is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# FFmpeg is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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=head1 NAME
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make_chlayout_test - produce a multichannel test file with the channels
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clearly identified
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=head1 SYNOPSIS
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tools/make_chlayout_test I<channels> I<out_options>
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=head1 DESCRIPTION
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This script uses B<ffmpeg> and B<libflite> to produce a file with audio
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channels clearly identified by their name. The resulting file can be used to
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check that the layout and order of channels is correctly handled by a piece
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of software, either a part of B<FFmpeg> or not.
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I<channels> is a list of channels or channel layouts, separated by '+'.
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I<out_options> is a list of valid ffmpeg outout options, including the
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output file.
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Note that some output codecs or formats can not handle arbitrary channel
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layout.
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This script requires a B<ffmpeg> binary, either in the source tree or in the
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search path; it must have the flite audio source enabled.
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=head1 EXAMPLES
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Check that the speakers are correctly plugged:
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tools/make_chlayout_test FL+FR -f alsa default
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Produce a 5.1 FLAC file:
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tools/make_chlayout_test 5.1 surround.flac
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=cut
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use strict;
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use warnings;
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use Getopt::Long ":config" => "require_order";
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use Pod::Usage;
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GetOptions (
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"help|usage|?|h" => sub { pod2usage({ -verbose => 1, -exitval => 0 }) },
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"manpage|m" => sub { pod2usage({ -verbose => 2, -exitval => 0 }) },
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) and @ARGV >= 2 or pod2usage({ -verbose => 1, -exitval => 1 });
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my $channels = shift @ARGV;
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my @out_options = @ARGV;
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my $ffmpeg = exists $ENV{FFMPEG} ? $ENV{FFMPEG} :
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$0 =~ /(.*)\// && -e "$1/../ffmpeg" ? "$1/../ffmpeg" :
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"ffmpeg";
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my %channel_label_to_descr;
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my %layout_to_channels;
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{
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open my $stderr, ">&STDERR";
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open STDERR, ">", "/dev/null";
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open my $f, "-|", $ffmpeg, "-layouts" or die "$ffmpeg: $!\n";
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open STDERR, ">&", $stderr;
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while (<$f>) {
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chomp;
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next if /^NAME/ or /:$/ or /^$/; # skip headings
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my ($name, $descr) = split " ", $_, 2;
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next unless $descr;
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if ($descr =~ /^[[:upper:]]+(?:\+[[:upper:]]+)*$/) {
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$layout_to_channels{$name} = [ split /\+/, $descr ];
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} else {
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$channel_label_to_descr{$name} = $descr;
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}
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}
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}
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my @channels = map { @{$layout_to_channels{$_} // [$_]} } split /\+/, $channels;
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my $layout = join "+", @channels;
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my $graph = "";
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my $concat_in = "";
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for my $i (0 .. $#channels) {
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my $label = $channels[$i];
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my $descr = $channel_label_to_descr{$label}
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or die "Channel $label not found\n";
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$graph .= "flite=text='${descr}', aformat=channel_layouts=mono, " .
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"pan=${layout}:${label}=c0 [ch$i] ;\n";
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$concat_in .= "[ch$i] ";
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}
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$graph .= "${concat_in}concat=v=0:a=1:n=" . scalar(@channels);
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exec $ffmpeg, "-f", "lavfi", "-i", $graph, @out_options
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or die "$ffmpeg: $!\n";
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