1 | ###########################################################################
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2 | #
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3 | # MultimediaConverter - helper plugin that does audio and video conversion using ffmpeg
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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 MultimediaConverter;
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27 |
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28 | use BaseMediaConverter;
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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 | @MultimediaConverter::ISA = ('BaseMediaConverter');
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38 | }
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39 |
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40 | my $arguments = [
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41 | { 'name' => "converttotype",
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42 | 'desc' => "{ImageConverter.converttotype}",
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43 | 'type' => "string",
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44 | 'deft' => "",
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45 | 'reqd' => "no" },
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46 | { 'name' => "minimumsize",
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47 | 'desc' => "{ImageConverter.minimumsize}",
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48 | 'type' => "int",
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49 | 'deft' => "100",
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50 | 'range' => "1,",
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51 | 'reqd' => "no" },
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52 | ];
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53 |
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54 | my $options = { 'name' => "MultimediaConverter",
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55 | 'desc' => "{MultimediaConverter.desc}",
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56 | 'abstract' => "yes",
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57 | 'inherits' => "yes",
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58 | 'args' => $arguments };
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59 |
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60 | sub new {
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61 | my ($class) = shift (@_);
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62 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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63 | push(@$pluginlist, $class);
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64 |
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65 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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66 | push(@{$hashArgOptLists->{"OptList"}},$options);
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67 |
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68 | my $self = new BaseMediaConverter($pluginlist, $inputargs, $hashArgOptLists, 1);
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69 |
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70 |
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71 | return bless $self, $class;
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72 |
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73 | }
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74 |
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75 |
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76 |
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77 | # needs to be called after BasePlugin init, so that outhandle is set up.
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78 | sub init {
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79 | my $self = shift(@_);
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80 |
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81 | my $outhandle = $self->{'outhandle'};
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82 |
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83 | $self->{'tmp_file_paths'} = ();
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84 |
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85 | # Check that ffmpeg is installed and available on the path
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86 | my $multimedia_conversion_available = 1;
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87 | my $no_multimedia_conversion_reason = "";
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88 |
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89 | # None of this works very well on Windows 95/98...
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90 | if ($ENV{'GSDLOS'} eq "windows" && !Win32::IsWinNT()) {
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91 | $multimedia_conversion_available = 0;
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92 | $no_multimedia_conversion_reason = "win95notsupported";
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93 | } else {
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94 |
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95 | my $result = `ffmpeg -h 2>&1`;
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96 |
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97 | if (!defined $result || $result !~ m/^FFmpeg version/m) {
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98 | $self->{'ffmpeg_installed'} = 0;
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99 | print $outhandle $result;
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100 | $multimedia_conversion_available = 0;
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101 | $no_multimedia_conversion_reason = "ffmpegnotinstalled";
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102 | }
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103 | else {
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104 | $self->{'ffmpeg_installed'} = 1;
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105 | }
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106 | }
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107 |
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108 | $self->{'multimedia_conversion_available'} = $multimedia_conversion_available;
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109 | $self->{'no_multimedia_conversion_reason'} = $no_multimedia_conversion_reason;
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110 |
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111 | if ($self->{'multimedia_conversion_available'} == 0) {
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112 | &gsprintf($outhandle, "MultimediaConverter: {MultimediaConverter.noconversionavailable} ({MultimediaConverter.".$self->{'no_multimedia_conversion_reason'}."})\n");
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113 | }
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114 |
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115 | }
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116 |
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117 |
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118 |
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119 |
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120 | sub identify {
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121 | my ($filename, $outhandle, $verbosity) = @_;
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122 |
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123 | die "MultimediaConvert::identify() needs to be defined by inheriting plugin";
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124 | }
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125 |
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126 |
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127 |
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128 | sub init_cache_for_file {
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129 | my $self = shift(@_);
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130 |
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131 | my ($media_filename) = @_;
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132 |
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133 | $self->SUPER::init_cache_for_file($media_filename);
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134 |
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135 |
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136 | # This should probably be replaced with Anu's work that replaced
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137 | # non-ASCII chars with URL encodings
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138 |
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139 | my $ascii_only_filenames = $self->{'use_ascii_only_filenams'};
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140 |
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141 | if (defined $ascii_only_filenames && ($ascii_only_filenames)) {
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142 | my $file_root = $self->{'cached_file_root'};
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143 | $self->{'cached_file_root'} = ascii_only_filename($file_root);
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144 | }
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145 |
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146 | my @ffmpeg_monitor = ( 'monitor_init' , "MultimediaConverter::ffmpeg_monitor_init",
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147 | 'monitor_line' , "MultimediaConverter::ffmpeg_monitor_line",
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148 | 'monitor_deinit' , "MultimediaConverter::ffmpeg_monitor_deinit" );
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149 |
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150 |
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151 | $self->{'ffmpeg_monitor'} = \@ffmpeg_monitor;
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152 |
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153 |
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154 | }
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155 |
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156 |
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157 |
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158 |
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159 | sub ascii_only_filename
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160 | {
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161 | my ($file) = @_;
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162 |
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163 | my $file_unicode = pack("U0C*", map { ord($_) } split(//,$file)); # force explicitly to unicode
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164 |
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165 | my @ascii_only_chars
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166 | = map { $_ >= 128 # if non-ascii
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167 | ? ""
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168 | : chr($_) } unpack("U*", $file_unicode); # unpack Unicode characters
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169 |
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170 | my $ascii_file = join("",@ascii_only_chars);
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171 |
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172 | if ($ascii_file eq "") {
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173 | print STDERR "Warning: filename includes no ASCII characters\n";
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174 | print STDERR " Keeping as original filename\n";
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175 | $ascii_file = $file;
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176 | }
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177 |
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178 | return $ascii_file;
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179 | }
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180 |
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181 |
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182 | sub remove_difficult_chars
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183 | {
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184 | my $self = shift @_;
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185 |
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186 | my ($file) = @_;
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187 |
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188 | # remove problematic characters from filename that make using it in a URL difficult
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189 |
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190 | my $file_unicode = pack("U0C*", map { ord($_) } split(//,$file)); # force explicitly to unicode
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191 |
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192 | my $url = $file_unicode;
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193 | $url =~ s/\x{2018}|\x{2019}|\x{201C}|\x{201D}//g; # remove smart quotes as cause problem in URL for streaming web server
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194 | $url =~ s/\x{2013}/\-/g; # change en-dash to '-' as again causes problems for streaming web server
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195 |
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196 | return $url;
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197 | }
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198 |
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199 |
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200 | sub url_safe
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201 | {
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202 | my $self = shift @_;
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203 |
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204 | my ($file) = @_;
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205 |
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206 | my @url_utf8_chars
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207 | = map { $_ >= 128 # if non-ascii
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208 | ? "%" . sprintf("%02X", $_)
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209 | : chr($_) } unpack("U*", $file); # unpack Unicode characters
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210 |
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211 | my $url = join("",@url_utf8_chars);
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212 |
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213 |
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214 | return $url;
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215 | }
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216 |
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217 |
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218 |
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219 | sub gsdlhome_independent
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220 | {
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221 | my $self = shift @_;
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222 | my ($filename) = @_;
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223 |
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224 | my $gsdlhome = $ENV{'GSDLHOME'};
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225 | $gsdlhome = &util::filename_to_regex($gsdlhome);
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226 |
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227 | my $filename_gsdlenv = $filename;
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228 |
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229 | if ($ENV{'GSDLOS'} =~ /^windows$/i) {
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230 | $filename_gsdlenv =~ s@^$gsdlhome@%GSDLHOME%@;
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231 | }
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232 | else {
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233 | $filename_gsdlenv =~ s@^$gsdlhome@\$GSDLHOME@;
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234 | }
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235 |
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236 | return $filename_gsdlenv;
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237 | }
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238 |
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239 |
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240 | sub ffmpeg_monitor_init
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241 | {
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242 | my $saved_record_sep = $/;
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243 | $/ = "\r";
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244 |
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245 | my $saved_buffer_len = $|;
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246 | $| = 1;
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247 |
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248 | my $saved_rec = { 'saved_record_sep' => $saved_record_sep,
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249 | 'saved_buffer_len' => $saved_buffer_len };
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250 |
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251 | return $saved_rec;
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252 | }
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253 |
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254 |
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255 |
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256 | sub ffmpeg_monitor_deinit
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257 | {
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258 | my ($saved_rec) = @_;
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259 |
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260 | my $saved_record_sep = $saved_rec->{'saved_record_sep'};
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261 | my $saved_buffer_len = $saved_rec->{'saved_buffer_len'};
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262 |
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263 | $/ = $saved_record_sep;
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264 | $| = $saved_buffer_len;
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265 | }
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266 |
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267 |
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268 | sub ffmpeg_monitor_line
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269 | {
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270 | my ($line) = @_;
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271 |
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272 | my $had_error = 0;
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273 | my $generate_dot = 0;
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274 |
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275 | if ($line =~ m/^frame=/)
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276 | {
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277 | $generate_dot = 1;
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278 | }
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279 |
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280 | return ($had_error,$generate_dot);
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281 | }
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282 |
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283 |
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284 |
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285 |
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286 | 1;
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