1 | ###########################################################################
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2 | #
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3 | # AudioConverter - helper plugin that does audio conversion
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4 | #
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5 | # A component of the Greenstone digital library software
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6 | # from the New Zealand Digital Library Project at the
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7 | # University of Waikato, New Zealand.
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8 | #
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9 | # Copyright (C) 2008 New Zealand Digital Library Project
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10 | #
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11 | # This program is free software; you can redistribute it and/or modify
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12 | # it under the terms of the GNU General Public License as published by
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13 | # the Free Software Foundation; either version 2 of the License, or
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14 | # (at your option) any later version.
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15 | #
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16 | # This program is distributed in the hope that it will be useful,
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17 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 | # GNU General Public License for more details.
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20 | #
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21 | # You should have received a copy of the GNU General Public License
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22 | # along with this program; if not, write to the Free Software
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23 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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24 | #
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25 | ###########################################################################
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26 | package AudioConverter;
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27 |
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28 | use MultimediaConverter;
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29 |
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30 |
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31 | use strict;
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32 | no strict 'refs'; # allow filehandles to be variables and viceversa
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33 |
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34 | use gsprintf 'gsprintf';
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35 |
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36 | BEGIN {
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37 | @AudioConverter::ISA = ('MultimediaConverter');
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38 | }
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39 |
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40 |
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41 | my $arguments = [
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42 | ];
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43 |
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44 | my $options = { 'name' => "ImageConverter",
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45 | 'desc' => "{ImageConverter.desc}",
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46 | 'abstract' => "yes",
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47 | 'inherits' => "yes",
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48 | 'args' => $arguments };
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49 |
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50 | sub new {
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51 | my ($class) = shift (@_);
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52 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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53 | push(@$pluginlist, $class);
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54 |
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55 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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56 | push(@{$hashArgOptLists->{"OptList"}},$options);
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57 |
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58 | my $self = new MultimediaConverter($pluginlist, $inputargs, $hashArgOptLists, 1);
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59 |
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60 |
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61 | return bless $self, $class;
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62 |
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63 | }
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64 |
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65 | # Discover the characteristics of a audio file.
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66 |
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67 | # Equivalent step to that in ImagePlugin that uses ImageMagicks's
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68 | # 'indentify' utility
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69 |
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70 | # Here we use 'ffmpeg' for audio but for consistency keep the Perl
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71 | # method name the same as before
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72 |
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73 |
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74 | sub identify {
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75 | my ($audio, $outhandle, $verbosity) = @_;
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76 |
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77 | # Use the ffmpeg command to get the file specs
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78 | my $command = "ffmpeg -i \"$audio\"";
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79 |
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80 | print $outhandle " $command\n" if ($verbosity > 2);
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81 | my $result = '';
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82 | $result = `$command 2>&1`;
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83 | print $outhandle " $result\n" if ($verbosity > 4);
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84 |
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85 | # Read the type, width, and height etc.
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86 | my $vtype = 'unknown';
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87 | my $vcodec = 'unknown';
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88 | my $width = 'unknown';
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89 | my $height = 'unknown';
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90 | my $fps = 'unknown';
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91 |
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92 | my $atype = 'unknown';
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93 | my $afreq = 'unknown';
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94 | my $achan = 'unknown';
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95 | my $arate = 'unknown';
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96 |
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97 | my $audio_safe = quotemeta $audio;
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98 |
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99 | # strip off everything up to filename
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100 | $result =~ s/^.*\'$audio_safe\'://s;
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101 |
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102 | if ($result =~ m/Audio: (\w+), (\d+) Hz, (\w+)(?:, (\d+.*))?/m) {
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103 | $atype = $1;
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104 | $afreq = $2;
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105 | $achan = $3;
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106 | $arate = $4 if (defined $4);
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107 | }
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108 |
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109 | # Read the duration
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110 | my $duration = "unknown";
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111 | if ($result =~ m/Duration: (\d+:\d+:\d+\.\d+)/m) {
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112 | $duration = $1;
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113 | }
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114 | print $outhandle " file: $audio:\t $atype, $duration\n"
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115 | if ($verbosity > 2);
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116 |
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117 | if ($verbosity >3) {
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118 | print $outhandle "\t freq = $afreq Hz, $achan, $arate\n";
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119 | }
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120 |
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121 | # Return the specs
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122 | return ($duration, -s $audio, $atype,$afreq,$achan,$arate);
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123 | }
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124 |
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125 |
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126 |
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127 | sub audio_converto_cmd
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128 | {
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129 | my $self = shift (@_);
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130 | my ($originalfilename,$converttotype) = @_;
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131 |
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132 | my $output_dir = $self->{'cached_dir'};
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133 | my $iaudio_root = $self->{'cached_file_root'};
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134 |
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135 |
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136 | my $file = "$iaudio_root.$converttotype";
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137 | my $filename = &util::filename_cat($output_dir,$file);
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138 |
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139 | my $exp_duration = $self->{'exp_duration'};
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140 | my $t_opt = (defined $exp_duration) ? "-t $exp_duration" : "";
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141 |
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142 | my $main_opts = "-y $t_opt";
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143 |
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144 |
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145 | my $originalfilename_gsdlenv = $self->gsdlhome_independent($originalfilename);
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146 | my $filename_gsdlenv = $self->gsdlhome_independent($filename);
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147 |
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148 |
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149 | my $convertto_cmd = "ffmpeg $main_opts -i \"$originalfilename_gsdlenv\"";
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150 | $convertto_cmd .= " -y \"$filename_gsdlenv\"";
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151 |
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152 | return $convertto_cmd;
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153 | }
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154 |
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155 |
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156 |
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157 | sub audio_stream_cmd
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158 | {
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159 | my $self = shift (@_);
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160 | my ($iaudio_filename,
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161 | $streaming_bitrate,$streaming_size,
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162 | $opt_streaming_achan, $opt_streaming_arate) = @_;
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163 |
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164 | my $streaming_achan
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165 | = (defined $opt_streaming_achan) ? $opt_streaming_achan : 2;
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166 |
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167 | my $streaming_arate
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168 | = (defined $opt_streaming_arate) ? $opt_streaming_arate : 22050;
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169 |
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170 | my $output_dir = $self->{'cached_dir'};
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171 | my $iaudio_root = $self->{'cached_file_root'};
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172 |
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173 | my $mp3_file = "${iaudio_root}_stream.mp3";
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174 | my $mp3_filename = &util::filename_cat($output_dir,$mp3_file);
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175 |
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176 | my $exp_duration = $self->{'exp_duration'};
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177 | my $t_opt = (defined $exp_duration) ? "-t $exp_duration" : "";
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178 |
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179 | my $main_opts = "-y $t_opt";
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180 |
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181 | my $bitrate_opt = "-b $streaming_bitrate";
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182 | my $stream_opts .= " -ac $streaming_achan -ar $streaming_arate";
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183 |
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184 |
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185 | my $all_opts = "$main_opts $stream_opts";
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186 |
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187 | my $ffmpeg_cmd;
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188 |
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189 | my $iaudio_filename_gsdlenv = $self->gsdlhome_independent($iaudio_filename);
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190 | my $mp3_filename_gsdlenv = $self->gsdlhome_independent($mp3_filename);
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191 |
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192 |
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193 | $ffmpeg_cmd = "ffmpeg -i \"$iaudio_filename_gsdlenv\" $all_opts -y \"$mp3_filename_gsdlenv\"";
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194 |
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195 | return ($ffmpeg_cmd,$mp3_filename,$mp3_file);
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196 | }
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197 |
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198 |
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199 |
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200 | 1;
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