115 lines
3.4 KiB
Text
115 lines
3.4 KiB
Text
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#!/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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