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Diffstat (limited to 'modules/getid3/module.audio.au.php')
| -rw-r--r-- | modules/getid3/module.audio.au.php | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/modules/getid3/module.audio.au.php b/modules/getid3/module.audio.au.php new file mode 100644 index 00000000..ef0e29c2 --- /dev/null +++ b/modules/getid3/module.audio.au.php @@ -0,0 +1,184 @@ +<?php +// +----------------------------------------------------------------------+
+// | PHP version 5 |
+// +----------------------------------------------------------------------+
+// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
+// +----------------------------------------------------------------------+
+// | This source file is subject to version 2 of the GPL license, |
+// | that is bundled with this package in the file license.txt and is |
+// | available through the world-wide-web at the following url: |
+// | http://www.gnu.org/copyleft/gpl.html | +// +----------------------------------------------------------------------+ +// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org | +// +----------------------------------------------------------------------+
+// | Authors: James Heinrich <infoØgetid3*org> |
+// | Allan Hansen <ahØartemis*dk> |
+// +----------------------------------------------------------------------+ +// | module.audio.au.php | +// | module for analyzing AU files | +// | dependencies: NONE | +// +----------------------------------------------------------------------+
+//
+// $Id: module.audio.au.php,v 1.2 2006/11/02 10:48:01 ah Exp $ + + + +class getid3_au extends getid3_handler +{ + + public function Analyze() { + + $getid3 = $this->getid3; + + fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); + $au_header = fread($getid3->fp, 8); + + // Magic bytes: .snd + + $getid3->info['au'] = array (); + $info_au = &$getid3->info['au']; + + $getid3->info['fileformat'] = 'au'; + $getid3->info['audio']['dataformat'] = 'au'; + $getid3->info['audio']['bitrate_mode'] = 'cbr'; + $info_au['encoding'] = 'ISO-8859-1'; + + $info_au['header_length'] = getid3_lib::BigEndian2Int(substr($au_header, 4, 4)); + $au_header .= fread($getid3->fp, $info_au['header_length'] - 8); + $getid3->info['avdataoffset'] += $info_au['header_length']; + + getid3_lib::ReadSequence('BigEndian2Int', $info_au, $au_header, 8, + array ( + 'data_size' => 4, + 'data_format_id'=> 4, + 'sample_rate' => 4, + 'channels' => 4 + ) + ); + $info_au['comments']['comment'][] = trim(substr($au_header, 24)); + + $info_au['data_format'] = getid3_au::AUdataFormatNameLookup($info_au['data_format_id']); + $info_au['used_bits_per_sample'] = getid3_au::AUdataFormatUsedBitsPerSampleLookup($info_au['data_format_id']); + if ($info_au['bits_per_sample'] = getid3_au::AUdataFormatBitsPerSampleLookup($info_au['data_format_id'])) { + $getid3->info['audio']['bits_per_sample'] = $info_au['bits_per_sample']; + } else { + unset($info_au['bits_per_sample']); + } + + $getid3->info['audio']['sample_rate'] = $info_au['sample_rate']; + $getid3->info['audio']['channels'] = $info_au['channels']; + + if (($getid3->info['avdataoffset'] + $info_au['data_size']) > $getid3->info['avdataend']) { + $getid3->warning('Possible truncated file - expecting "'.$info_au['data_size'].'" bytes of audio data, only found '.($getid3->info['avdataend'] - $getid3->info['avdataoffset']).' bytes"'); + } + + $getid3->info['playtime_seconds'] = $info_au['data_size'] / ($info_au['sample_rate'] * $info_au['channels'] * ($info_au['used_bits_per_sample'] / 8)); + $getid3->info['audio']['bitrate'] = ($info_au['data_size'] * 8) / $getid3->info['playtime_seconds']; + + return true; + } + + + + public static function AUdataFormatNameLookup($id) { + + static $lookup = array ( + 0 => 'unspecified format', + 1 => '8-bit mu-law', + 2 => '8-bit linear', + 3 => '16-bit linear', + 4 => '24-bit linear', + 5 => '32-bit linear', + 6 => 'floating-point', + 7 => 'double-precision float', + 8 => 'fragmented sampled data', + 9 => 'SUN_FORMAT_NESTED', + 10 => 'DSP program', + 11 => '8-bit fixed-point', + 12 => '16-bit fixed-point', + 13 => '24-bit fixed-point', + 14 => '32-bit fixed-point', + + 16 => 'non-audio display data', + 17 => 'SND_FORMAT_MULAW_SQUELCH', + 18 => '16-bit linear with emphasis', + 19 => '16-bit linear with compression', + 20 => '16-bit linear with emphasis + compression', + 21 => 'Music Kit DSP commands', + 22 => 'SND_FORMAT_DSP_COMMANDS_SAMPLES', + 23 => 'CCITT g.721 4-bit ADPCM', + 24 => 'CCITT g.722 ADPCM', + 25 => 'CCITT g.723 3-bit ADPCM', + 26 => 'CCITT g.723 5-bit ADPCM', + 27 => 'A-Law 8-bit' + ); + + return (isset($lookup[$id]) ? $lookup[$id] : false); + } + + + + public static function AUdataFormatBitsPerSampleLookup($id) { + + static $lookup = array ( + 1 => 8, + 2 => 8, + 3 => 16, + 4 => 24, + 5 => 32, + 6 => 32, + 7 => 64, + + 11 => 8, + 12 => 16, + 13 => 24, + 14 => 32, + + 18 => 16, + 19 => 16, + 20 => 16, + + 23 => 16, + + 25 => 16, + 26 => 16, + 27 => 8 + ); + return (isset($lookup[$id]) ? $lookup[$id] : false); + } + + + + public static function AUdataFormatUsedBitsPerSampleLookup($id) { + + static $lookup = array ( + 1 => 8, + 2 => 8, + 3 => 16, + 4 => 24, + 5 => 32, + 6 => 32, + 7 => 64, + + 11 => 8, + 12 => 16, + 13 => 24, + 14 => 32, + + 18 => 16, + 19 => 16, + 20 => 16, + + 23 => 4, + + 25 => 3, + 26 => 5, + 27 => 8, + ); + return (isset($lookup[$id]) ? $lookup[$id] : false); + } + +} + + +?>
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