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package Audio::Extract::PCM::Backend::SoX; |
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use strict; |
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use warnings; |
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use Carp; |
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use IO::CaptureOutput qw( qxx qxy ); |
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use base qw(Audio::Extract::PCM::Backend); |
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use Audio::Extract::PCM::Format; |
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23
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8
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9
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unless (defined get_sox_version()) { |
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die __PACKAGE__ . " - trynext\n"; # try next backend |
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} |
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13
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my @bppvals = ( |
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{ |
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value => '-b', |
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samplesize => 1, |
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}, |
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{ |
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value => '-l', |
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samplesize => 4, |
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}, |
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{ |
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value => '-d', |
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samplesize => 8, |
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}, |
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{ |
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value => '-w', |
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samplesize => 2, |
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}, |
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); |
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my @signvals = ( |
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{ |
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value => '-u', |
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signed => 0, |
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}, |
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{ |
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value => '-s', |
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signed => 1, |
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}, |
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); |
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42
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if (get_sox_version() && get_sox_version() > '13.0.0') { |
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$_->{value} = '-' . $_->{samplesize} for @bppvals; |
44
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} |
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46
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=head1 NAME |
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48
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Audio::Extract::PCM::Backend::SoX - sox backend for audio extraction |
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50
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=head1 METHODS |
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52
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=head2 pcm_back |
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54
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See L. |
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56
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=head1 SYNOPSIS |
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58
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Note that this backend does not support C, i.e. it only supports the |
59
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C method, which will read all pcm data at once. |
60
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61
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=cut |
62
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63
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sub pcm_back { |
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0
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0
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my $this = shift; |
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0
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0
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my ($format) = @_; |
66
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67
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0
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0
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my $fn = $this->{filename} or croak 'No filename'; |
68
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69
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0
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0
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my @param; |
70
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71
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0
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0
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if (defined $format->samplesize) { |
72
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0
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0
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0
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my ($bpp_option, $bpp_format) = $format->findvalue(\@bppvals) |
73
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or return 'trynext'; |
74
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75
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0
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0
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push @param, $bpp_option; |
76
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} |
77
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# We need either -s or -u, otherwise we cannot be sure that sox doesn't use |
78
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# strange output formats like u-law. |
79
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# We default to "-s" if no signedness is requested. Older soxes still use |
80
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# unsigned if the input file is more than 8-bit, newer soxes don't and |
81
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# convert to 8-bit instead. Cannot do anything about it, I guess. Sox |
82
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# doesn't have a flag that says "either signed or unsigned, I need |
83
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# uncompressed PCM format!" |
84
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0
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0
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my ($signoption, $signformat) = $format->findvalue(\@signvals); |
85
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0
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0
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push @param, $signoption; |
86
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87
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2
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2
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1903
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use bytes; |
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2
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16
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2
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14
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88
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89
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0
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0
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local $ENV{LC_ALL} = 'C'; |
90
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91
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0
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0
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push @param, '-r'.$format->freq if defined $format->freq; |
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0
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push @param, '-c'.$format->channels if defined $format->channels; |
93
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94
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my @command = ('sox', $fn, @param, '-twav', '-'); |
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96
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0
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0
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warn qq(Running "@command"\n) if $ENV{DEBUG}; |
97
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98
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0
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my $pcm = \do {my $dummy}; |
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0
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99
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100
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0
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0
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($$pcm, my ($soxerr, $success)) = qxx(@command); |
101
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102
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0
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0
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chomp $soxerr; |
103
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104
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# # Well, this is ugly, but that warning is annoying and does not matter to |
105
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# # us (we strip the header anyway) |
106
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# $soxerr =~ s/.*header will be wrong since can't seek.*\s*//; |
107
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108
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# Now that we use -V3, we cannot display all that stderr stuff, so the |
109
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# above is commented out. |
110
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# (update: no longer true, we don't use -V3 any more) |
111
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112
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0
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0
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0
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unless ($success) { |
113
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0
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0
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my $err; |
114
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0
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0
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0
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if ($!) { |
115
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0
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0
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0
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$err = length($soxerr) ? "$! - $soxerr" : "$!"; |
116
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} else { |
117
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# show only the last line |
118
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0
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0
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0
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$soxerr = [$soxerr =~ /[^\n\r]+/g]->[-1] || ''; |
119
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120
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0
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0
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$err = length($soxerr) ? $soxerr : "Error running sox"; |
121
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} |
122
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123
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0
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0
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undef $$pcm; |
124
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125
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0
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0
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$this->error($err); |
126
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0
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0
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return (); |
127
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} |
128
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129
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# warn $soxerr if length $soxerr; |
130
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131
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# Now get the format data |
132
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133
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0
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0
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my ($headersize, $endformat) = _parsewav($$pcm); |
134
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135
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# SoX doesn't always return what we tell it to return. |
136
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# Quote: "sox wav: Do not support unsigned with 16-bit data. Forcing to Signed." |
137
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0
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0
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0
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return 'trynext' unless $format->satisfied($endformat); |
138
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139
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0
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0
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$this->format($endformat); |
140
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141
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0
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0
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substr($$pcm, 0, $headersize, ''); # strip wave header |
142
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143
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0
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0
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return $pcm; |
144
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145
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# Following is the old sox diagnostics parsing code, for historic reasons. |
146
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147
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# Older soxes had a very different format of the -V3 output. From sox's |
148
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# Changelog, I *assume* that it changed in 13.0.0. |
149
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# What I actually tested is 12.17.9 and 14.0.1, for sample output see the |
150
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# comment at the bottom of this module. |
151
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152
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# my ($sample_size, $duration, $channels, $endian, $endfreq, $signed); |
153
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# |
154
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# if (get_sox_version() >= '13.0.0') { |
155
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# |
156
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# my %infos = ( |
157
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# # Parse table |
158
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# map { |
159
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# /^(.+?)\s*:\s*(.*?)\s*$/ ? (lc $1, $2) : () |
160
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# } |
161
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# # Find output file stanza |
162
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# grep { |
163
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# /^Output File\s*:/i .. /^\s*$/ |
164
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# } |
165
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# # Split lines |
166
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# $soxerr =~ /[^\n\r]+/g |
167
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# ); |
168
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# |
169
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# if ($ENV{DEBUG}) { |
170
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# warn "SoX stderr:\n$soxerr\n"; |
171
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# } |
172
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# |
173
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# $channels = $infos{channels} or die "no channels from sox"; |
174
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# $endian = $infos{'endian type'} or die "no endianness from sox"; |
175
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# $endfreq = $infos{'sample rate'} or die "no sample rate from sox"; |
176
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# |
177
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# $sample_size = $infos{'sample size'} || $infos{precision} |
178
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# or die "no sample size from sox"; |
179
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# $sample_size =~ s/^([0-9]+).*// or die "bad sample size from sox: $sample_size"; |
180
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# $sample_size = $1 / 8; |
181
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# |
182
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# $duration = $infos{duration} or die "no duration from sox"; |
183
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# $duration =~ / (\d+) samples/i or die "bad duration from sox: $duration"; |
184
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# $duration = $1 / $endfreq; |
185
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# |
186
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# my $encoding = $infos{'sample encoding'}; |
187
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# $signed = $encoding =~ /\bsigned\b/i ? 1 : $encoding =~ /\bunsigned\b/i ? 0 |
188
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# : die "no signed from sox"; |
189
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# |
190
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# } else { |
191
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# # sox < 13.0.0 |
192
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# |
193
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# my ($info) = $soxerr =~ m{^(sox: Writing Wave file:.*?bits/samp)}msi; |
194
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# my ($info2) = $soxerr =~ m{^(sox: Output file .*? channels\s*$)}msi; |
195
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# |
196
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# ($sample_size) = $info =~ m{(\d+) bits/samp}i or die "no sample size from sox"; |
197
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# $sample_size /= 8; |
198
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# |
199
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# ($endfreq) = $info =~ m{(\d+) samp/sec}i or die "no sample rate from sox"; |
200
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# $endian = 'little'; # ? |
201
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# ($channels) = $info =~ m{(\d+) channels}i or die "no channels from sox"; |
202
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# |
203
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# ($duration) = $soxerr =~ m{^sox: Finished writing.*?(\d+) samples}mi |
204
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# or die "no duration from sox"; |
205
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# $duration /= $endfreq; |
206
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# |
207
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# $signed = $info2 =~ /encoding signed/i ? 1 : $info2 =~ /encoding unsigned/i ? 0 |
208
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# : die "no signed from sox: $info2"; |
209
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# } |
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} |
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=head1 SUBROUTINES |
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=head2 get_sox_version |
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This will return the SoX version as a L object. The result will be |
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cached, i.e. if you install a new sox, this module will not recognize it until |
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it is reloaded or the application using it is restarted. |
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If no sox program is in the path or C outputs strange things, C |
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will be returned. In the latter case, a warning will be issued. |
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Currently, the only internal use is to find out whether SoX is above version |
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13.0.0, because they renamed the C<"-b"/"-w"/"-l"/"-d"> flags to |
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C<"-1"/"-2"/"-4"/"-8"> by then. Note that the old flags were still recognized |
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(though deprecated) until SoX 14.1.0. |
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=cut |
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{ |
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my $soxver; |
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sub get_sox_version { |
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return $soxver if defined $soxver; |
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# Note: we use sox -h, not sox --version. |
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# The latter doesn't work with e.g. 12.17.9 (etch) |
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# Older soxes print stuff like "sox: Version 12.17.9" in the first line of sox -h, |
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# newer soxes print stuff like "sox: SoX v14.0.1" instead. |
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my ($vers_output, $success, $exitstatus) = qxy(qw(sox -h)); |
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# return undef unless $success; |
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# argh, old soxes have exit status 1 for sox -h (and print to stderr; |
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# rather than stdout like newer ones) |
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use POSIX qw(WIFEXITED); |
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return undef unless WIFEXITED($exitstatus); |
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if (defined $vers_output) { |
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$vers_output =~ s#[\r\n].*##s; |
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($soxver) = $vers_output =~ /(?:Version |v)(\d+\.\d+\.\d+)/ |
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or warn "Strange sox -h output (first line): $vers_output\n"; |
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return undef unless defined $soxver; |
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} |
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3703
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use version; |
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5429
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14
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$soxver = version->new($soxver); |
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return $soxver; |
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} |
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} |
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=head2 used_versions |
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Abstract interface to L. |
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271
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=cut |
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273
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sub used_versions { |
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return { |
275
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0
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0
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sox => get_sox_version(), |
276
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}; |
277
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} |
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# This analyzes the header of the wave files that sox outputs. |
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# I used to parse the diagnostics output from sox -V3, but when I realized how |
283
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# different it is in different sox versions, I found that it's easier to just |
284
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# parse the wave header that sox produces. This is a very simple wave header |
285
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# analyzer; it is designed only for the headers from sox with the flags that we |
286
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# give to it. There are more sophisticated modules like Audio::Wav for other |
287
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# wave files. |
288
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289
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# By the way, why don't I use sox' "raw" format? Well, for one thing, I'd |
290
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# have to specify exact format parameters to sox, while for wave output, it |
291
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# will default to the input format, which seems wiser. I think there was |
292
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# another reason, but I can't remember right now... |
293
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|
sub _parsewav { |
294
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0
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0
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|
my ($header) = @_; |
295
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296
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0
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|
my $headersize = 44; |
297
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0
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|
my $datachunkstart = 36; |
298
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299
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|
# parse riff header |
300
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0
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|
my ($RIFF, $riffsize, $WAVE) = unpack ('a4Va4', $header); |
301
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0
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0
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die 'no riff' unless 'RIFF' eq $RIFF; |
302
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die 'no wave' unless 'WAVE' eq $WAVE; |
303
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304
|
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|
# parse format header |
305
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0
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|
my ($fmt, $compr, $chans, $freq, $bps) = unpack ( |
306
|
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|
|
'@12a4x4vvVx6v', $header); |
307
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308
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0
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0
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|
die 'no fmt' unless 'fmt ' eq $fmt; |
309
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310
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0
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0
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|
|
if (0xFFFE == $compr) { |
311
|
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|
|
# WAVE_FORMAT_EXTENSIBLE |
312
|
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313
|
0
|
|
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|
|
|
(my ($extsize), $compr, my ($strange_magic_thing)) = |
314
|
|
|
|
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|
|
unpack('@36vx6vH28', $header); |
315
|
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|
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316
|
0
|
0
|
|
|
|
|
unless ('000000001000800000AA00389B71' eq uc $strange_magic_thing) { |
317
|
0
|
|
|
|
|
|
die 'unexpected strange magic thing'; |
318
|
|
|
|
|
|
|
} |
319
|
0
|
0
|
|
|
|
|
die "unexpected extsize $extsize" unless 22 == $extsize; |
320
|
|
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|
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321
|
0
|
|
|
|
|
|
$_ += 24 for $headersize, $datachunkstart; |
322
|
|
|
|
|
|
|
} |
323
|
|
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|
|
|
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324
|
0
|
0
|
|
|
|
|
die 'only PCM/uncompressed supported' unless 1 == $compr; |
325
|
|
|
|
|
|
|
|
326
|
0
|
|
|
|
|
|
my $samplesize = $bps / 8; |
327
|
0
|
0
|
|
|
|
|
die 'only multiples of 8bps supported' unless $samplesize == int $samplesize; |
328
|
|
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|
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|
|
|
329
|
|
|
|
|
|
|
{ |
330
|
0
|
|
|
|
|
|
my ($chunkname, $chunksize) = unpack("\@${datachunkstart}a4V", $header); |
|
0
|
|
|
|
|
|
|
331
|
|
|
|
|
|
|
|
332
|
0
|
0
|
|
|
|
|
if ('fact' eq $chunkname) { |
333
|
0
|
|
|
|
|
|
$_ += 12 for $headersize, $datachunkstart; |
334
|
0
|
|
|
|
|
|
redo; |
335
|
|
|
|
|
|
|
} |
336
|
|
|
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|
|
|
|
337
|
0
|
0
|
|
|
|
|
die 'no "data"' unless 'data' eq $chunkname; |
338
|
|
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|
339
|
|
|
|
|
|
|
# Alright, we're in the data chunk at last. |
340
|
|
|
|
|
|
|
|
341
|
0
|
|
|
|
|
|
my $duration = $chunksize / $chans / $samplesize / $freq; |
342
|
|
|
|
|
|
|
|
343
|
0
|
0
|
|
|
|
|
return $headersize, AEPF->new( |
344
|
|
|
|
|
|
|
channels => $chans, |
345
|
|
|
|
|
|
|
freq => $freq, |
346
|
|
|
|
|
|
|
duration => $duration, |
347
|
|
|
|
|
|
|
samplesize => $samplesize, |
348
|
|
|
|
|
|
|
signed => ($samplesize > 1 ? 1 : 0), |
349
|
|
|
|
|
|
|
endian => 'little', |
350
|
|
|
|
|
|
|
); |
351
|
|
|
|
|
|
|
} |
352
|
|
|
|
|
|
|
} |
353
|
|
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|
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|
354
|
|
|
|
|
|
|
|
355
|
|
|
|
|
|
|
our $AVAILABLE = 1; |
356
|
|
|
|
|
|
|
|
357
|
|
|
|
|
|
|
# Sample -V3 output from sox: |
358
|
|
|
|
|
|
|
|
359
|
|
|
|
|
|
|
# 12.17.9: |
360
|
|
|
|
|
|
|
# |
361
|
|
|
|
|
|
|
# sox: invalid option -- 3 |
362
|
|
|
|
|
|
|
# (hehe, but as long as it isn't an error, why not) |
363
|
|
|
|
|
|
|
# sox: Detected file format type: ogg |
364
|
|
|
|
|
|
|
# |
365
|
|
|
|
|
|
|
# sox: Input file t/sine.ogg: using sample rate 44100 |
366
|
|
|
|
|
|
|
# size shorts, encoding Vorbis, 2 channels |
367
|
|
|
|
|
|
|
# sox: Do not support Vorbis with 16-bit data. Forcing to Signed. |
368
|
|
|
|
|
|
|
# sox: Writing Wave file: Microsoft PCM format, 2 channels, 44100 samp/sec |
369
|
|
|
|
|
|
|
# sox: 176400 byte/sec, 4 block align, 16 bits/samp |
370
|
|
|
|
|
|
|
# sox: Output file sine.wav: using sample rate 44100 |
371
|
|
|
|
|
|
|
# size shorts, encoding signed (2's complement), 2 channels |
372
|
|
|
|
|
|
|
# sox: Output file: comment "Processed by SoX" |
373
|
|
|
|
|
|
|
# |
374
|
|
|
|
|
|
|
# sox: Finished writing Wave file, 1764000 data bytes 441000 samples |
375
|
|
|
|
|
|
|
# |
376
|
|
|
|
|
|
|
# and 14.0.1: |
377
|
|
|
|
|
|
|
# sox: SoX v14.0.1 |
378
|
|
|
|
|
|
|
# |
379
|
|
|
|
|
|
|
# Input File : 't/sine.ogg' |
380
|
|
|
|
|
|
|
# Sample Size : 16-bit (2 bytes) |
381
|
|
|
|
|
|
|
# Sample Encoding: Vorbis |
382
|
|
|
|
|
|
|
# Channels : 2 |
383
|
|
|
|
|
|
|
# Sample Rate : 44100 |
384
|
|
|
|
|
|
|
# Duration : 00:10.00 = 441000 samples = 750 CDDA sectors |
385
|
|
|
|
|
|
|
# Endian Type : little |
386
|
|
|
|
|
|
|
# Reverse Nibbles: no |
387
|
|
|
|
|
|
|
# Reverse Bits : no |
388
|
|
|
|
|
|
|
# |
389
|
|
|
|
|
|
|
# sox wav: Do not support Vorbis with 16-bit data. Forcing to Signed. |
390
|
|
|
|
|
|
|
# |
391
|
|
|
|
|
|
|
# Output File : 'sine.wav' |
392
|
|
|
|
|
|
|
# Sample Size : 16-bit (2 bytes) |
393
|
|
|
|
|
|
|
# Sample Encoding: signed (2's complement) |
394
|
|
|
|
|
|
|
# Channels : 2 |
395
|
|
|
|
|
|
|
# Sample Rate : 44100 |
396
|
|
|
|
|
|
|
# Duration : 00:10.00 = 441000 samples = 750 CDDA sectors |
397
|
|
|
|
|
|
|
# Endian Type : little |
398
|
|
|
|
|
|
|
# Reverse Nibbles: no |
399
|
|
|
|
|
|
|
# Reverse Bits : no |
400
|
|
|
|
|
|
|
# Comment : 'Processed by SoX' |
401
|
|
|
|
|
|
|
# |
402
|
|
|
|
|
|
|
# sox sox: effects chain: input 44100Hz 2 channels 16 bits (multi) |
403
|
|
|
|
|
|
|
# sox sox: effects chain: output 44100Hz 2 channels 16 bits (multi) |
404
|
|
|
|
|
|
|
# |
405
|
|
|
|
|
|
|
# |
406
|
|
|
|
|
|
|
# now here comes 14.2.0: |
407
|
|
|
|
|
|
|
# |
408
|
|
|
|
|
|
|
# sox: SoX v14.2.0 |
409
|
|
|
|
|
|
|
# sox formats: detected file format type `wav' |
410
|
|
|
|
|
|
|
# |
411
|
|
|
|
|
|
|
# Input File : 'sine.wav' |
412
|
|
|
|
|
|
|
# Channels : 2 |
413
|
|
|
|
|
|
|
# Sample Rate : 44100 |
414
|
|
|
|
|
|
|
# Precision : 16-bit |
415
|
|
|
|
|
|
|
# Duration : 00:00:10.00 = 441000 samples = 750 CDDA sectors |
416
|
|
|
|
|
|
|
# Sample Encoding: 16-bit Signed Integer PCM |
417
|
|
|
|
|
|
|
# Endian Type : little |
418
|
|
|
|
|
|
|
# Reverse Nibbles: no |
419
|
|
|
|
|
|
|
# Reverse Bits : no |
420
|
|
|
|
|
|
|
# |
421
|
|
|
|
|
|
|
# |
422
|
|
|
|
|
|
|
# Output File : '-' (wav) |
423
|
|
|
|
|
|
|
# Channels : 2 |
424
|
|
|
|
|
|
|
# Sample Rate : 44100 |
425
|
|
|
|
|
|
|
# Precision : 16-bit |
426
|
|
|
|
|
|
|
# Duration : 00:00:10.00 = 441000 samples = 750 CDDA sectors |
427
|
|
|
|
|
|
|
# Sample Encoding: 16-bit Signed Integer PCM |
428
|
|
|
|
|
|
|
# Endian Type : little |
429
|
|
|
|
|
|
|
# Reverse Nibbles: no |
430
|
|
|
|
|
|
|
# Reverse Bits : no |
431
|
|
|
|
|
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# Comment : 'Processed by SoX' |
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# |
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# sox sox: effects chain: input 44100Hz 2 channels 16 bits (multi) |
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# sox sox: effects chain: output 44100Hz 2 channels 16 bits (multi) |
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436
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437
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=head1 SEE ALSO |
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439
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=over 8 |
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441
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=item * |
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443
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L - SoX homepage |
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445
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=back |