lib/Audio/Opusfile.pm

   1 package Audio::Opusfile;
   2
   3 use 5.014000;
   4 use strict;
   5 use warnings;
   6 use Carp;
   7
   8 use parent qw/Exporter/;
   9 use AutoLoader;
  10
  11 my @constants =
  12   qw/OPUS_CHANNEL_COUNT_MAX
  13          OP_ABSOLUTE_GAIN
  14          OP_DEC_FORMAT_FLOAT
  15          OP_DEC_FORMAT_SHORT
  16          OP_DEC_USE_DEFAULT
  17          OP_EBADHEADER
  18          OP_EBADLINK
  19          OP_EBADPACKET
  20          OP_EBADTIMESTAMP
  21          OP_EFAULT
  22          OP_EIMPL
  23          OP_EINVAL
  24          OP_ENOSEEK
  25          OP_ENOTAUDIO
  26          OP_ENOTFORMAT
  27          OP_EOF
  28          OP_EREAD
  29          OP_EVERSION
  30          OP_FALSE
  31          OP_GET_SERVER_INFO_REQUEST
  32          OP_HEADER_GAIN
  33          OP_HOLE
  34          OP_HTTP_PROXY_HOST_REQUEST
  35          OP_HTTP_PROXY_PASS_REQUEST
  36          OP_HTTP_PROXY_PORT_REQUEST
  37          OP_HTTP_PROXY_USER_REQUEST
  38          OP_PIC_FORMAT_GIF
  39          OP_PIC_FORMAT_JPEG
  40          OP_PIC_FORMAT_PNG
  41          OP_PIC_FORMAT_UNKNOWN
  42          OP_PIC_FORMAT_URL
  43          OP_SSL_SKIP_CERTIFICATE_CHECK_REQUEST
  44          OP_TRACK_GAIN/;
  45
  46 our @EXPORT_OK = @constants;
  47 our @EXPORT = @constants;
  48
  49 our $VERSION = '0.003';
  50
  51 sub AUTOLOAD {
  52     # This AUTOLOAD is used to 'autoload' constants from the constant()
  53     # XS function.
  54
  55     my $constname;
  56     our $AUTOLOAD;
  57     ($constname = $AUTOLOAD) =~ s/.*:://;
  58     croak "&Audio::Opusfile::constant not defined" if $constname eq 'constant';
  59     my ($error, $val) = constant($constname);
  60     if ($error) { croak $error; }
  61     {
  62         no strict 'refs';
  63         # Fixed between 5.005_53 and 5.005_61
  64 #XXX    if ($] >= 5.00561) {
  65 #XXX        *$AUTOLOAD = sub () { $val };
  66 #XXX    }
  67 #XXX    else {
  68             *$AUTOLOAD = sub { $val };
  69 #XXX    }
  70     }
  71     goto &$AUTOLOAD;
  72 }
  73
  74 require XSLoader;
  75 XSLoader::load('Audio::Opusfile', $VERSION);
  76 require Audio::Opusfile::Tags;
  77 require Audio::Opusfile::PictureTag;
  78
  79 # Preloaded methods go here.
  80
  81 sub new_from_file {
  82         my ($class, $file) = @_;
  83         open_file($file)
  84 }
  85
  86 sub new_from_memory {
  87         my ($class, $buf) = @_;
  88         open_memory($buf)
  89 }
  90
  91 1;
  92 __END__
  93
  94 =encoding utf-8
  95
  96 =head1 NAME
  97
  98 Audio::Opusfile - Very incomplete interface to the libopusfile Ogg Opus library
  99
 100 =head1 SYNOPSIS
 101
 102   use Audio::Opusfile;
 103   my $of = Audio::Opusfile->new_from_file('silence.opus');
 104   my $tags = $of->tags;
 105   say $tags->query('TITLE'); # Cellule
 106
 107 =head1 DESCRIPTION
 108
 109 Opus is a totally open, royalty-free, highly versatile audio codec.
 110 Opus is unmatched for interactive speech and music transmission over
 111 the Internet, but is also intended for storage and streaming
 112 applications. It is standardized by the Internet Engineering Task
 113 Force (IETF) as RFC 6716 which incorporated technology from Skype's
 114 SILK codec and Xiph.Org's CELT codec.
 115
 116 libopusfile is a library for decoding and basic manipulation of Ogg
 117 Opus files.
 118
 119 Audio::Opusfile is an interface to libopusfile. At the moment its only
 120 function is reading metadata and tags from an Ogg Opus file or buffer.
 121 Future versions will give access to a larger part of the libopusfile
 122 API.
 123
 124 Expect the API to change in future versions.
 125
 126 =head1 METHODS
 127
 128 =over
 129
 130 =item Audio::Opusfile->B<new_from_file>(I<$file>)
 131
 132 Creates a new Audio::Opusfile object from an Ogg Opus file.
 133
 134 Dies if the given file does not exist or is not a valid Ogg Opus file.
 135
 136 =item Audio::Opusfile->B<new_from_memory>(I<$buffer>)
 137
 138 Creates a new Audio::Opusfile object from a buffer containing Ogg Opus
 139 data.
 140
 141 Dies if the given buffer does not contain valid data.
 142
 143 =item Audio::Opusfile::test(I<$buffer>)
 144
 145 Returns true if the given buffer looks like the beginning of a valid
 146 Ogg Opus file, false otherwise.
 147
 148 Dies if the given buffer does not have sufficient data to tell if it
 149 is an Opus stream or if it looks like a Opus stream but parsing it
 150 failed.
 151
 152 =item B<$of>->head
 153
 154 Returns an L<Audio::Opusfile::Head> object corresponding to the file.
 155
 156 =item B<$of>->tags
 157
 158 Returns an L<Audio::Opusfile::Tags> object corresponding to the file.
 159
 160 =item B<$of>->seekable
 161
 162 Returns whether or not the data source being read is seekable.
 163
 164 =item B<$of>->link_count
 165
 166 Returns the number of links in this chained stream. Always returns 1
 167 for unseekable sources.
 168
 169 =item B<$of>->serialno([I<$link_index>])
 170
 171 Get the serial number of the given link in a (possibly-chained) Ogg
 172 Opus stream. If the given index is greater than the total number of
 173 links, this returns the serial number of the last link.
 174
 175 If the source is not seekable, I<$link_index> is negative, or
 176 I<$link_index> is not given, then this function returns the serial
 177 number of the current link.
 178
 179 =back
 180
 181 =head1 EXPORT
 182
 183 All constants are exported by default:
 184
 185   OPUS_CHANNEL_COUNT_MAX
 186   OP_ABSOLUTE_GAIN
 187   OP_DEC_FORMAT_FLOAT
 188   OP_DEC_FORMAT_SHORT
 189   OP_DEC_USE_DEFAULT
 190   OP_EBADHEADER
 191   OP_EBADLINK
 192   OP_EBADPACKET
 193   OP_EBADTIMESTAMP
 194   OP_EFAULT
 195   OP_EIMPL
 196   OP_EINVAL
 197   OP_ENOSEEK
 198   OP_ENOTAUDIO
 199   OP_ENOTFORMAT
 200   OP_EOF
 201   OP_EREAD
 202   OP_EVERSION
 203   OP_FALSE
 204   OP_GET_SERVER_INFO_REQUEST
 205   OP_HEADER_GAIN
 206   OP_HOLE
 207   OP_HTTP_PROXY_HOST_REQUEST
 208   OP_HTTP_PROXY_PASS_REQUEST
 209   OP_HTTP_PROXY_PORT_REQUEST
 210   OP_HTTP_PROXY_USER_REQUEST
 211   OP_PIC_FORMAT_GIF
 212   OP_PIC_FORMAT_JPEG
 213   OP_PIC_FORMAT_PNG
 214   OP_PIC_FORMAT_UNKNOWN
 215   OP_PIC_FORMAT_URL
 216   OP_SSL_SKIP_CERTIFICATE_CHECK_REQUEST
 217   OP_TRACK_GAIN
 218
 219
 220 =head1 SEE ALSO
 221
 222 L<Audio::Opusfile::Tags>,
 223 L<http://opus-codec.org/>,
 224 L<http://opus-codec.org/docs/opusfile_api-0.7/index.html>
 225
 226 =head1 AUTHOR
 227
 228 Marius Gavrilescu, E<lt>marius@ieval.roE<gt>
 229
 230 =head1 COPYRIGHT AND LICENSE
 231
 232 Copyright (C) 2016 by Marius Gavrilescu
 233
 234 This library is free software; you can redistribute it and/or modify
 235 it under the same terms as Perl itself, either Perl version 5.24.0 or,
 236 at your option, any later version of Perl 5 you may have available.
 237
 238
 239 =cut