diff options
Diffstat (limited to 'getid3/module.audio.au.php')
| -rw-r--r-- | getid3/module.audio.au.php | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/getid3/module.audio.au.php b/getid3/module.audio.au.php new file mode 100644 index 0000000..afbc75d --- /dev/null +++ b/getid3/module.audio.au.php @@ -0,0 +1,163 @@ +<?php +///////////////////////////////////////////////////////////////// +/// getID3() by James Heinrich <info@getid3.org> // +// available at http://getid3.sourceforge.net // +// or http://www.getid3.org // +///////////////////////////////////////////////////////////////// +// See readme.txt for more details // +///////////////////////////////////////////////////////////////// +// // +// module.audio.au.php // +// module for analyzing AU files // +// dependencies: NONE // +// /// +///////////////////////////////////////////////////////////////// + + +class getid3_au +{ + + function getid3_au(&$fd, &$ThisFileInfo) { + + fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); + $AUheader = fread($fd, 8); + + if (substr($AUheader, 0, 4) != '.snd') { + $ThisFileInfo['error'][] = 'Expecting ".snd" at offset '.$ThisFileInfo['avdataoffset'].', found "'.substr($AUheader, 0, 4).'"'; + return false; + } + + // shortcut + $ThisFileInfo['au'] = array(); + $thisfile_au = &$ThisFileInfo['au']; + + $ThisFileInfo['fileformat'] = 'au'; + $ThisFileInfo['audio']['dataformat'] = 'au'; + $ThisFileInfo['audio']['bitrate_mode'] = 'cbr'; + $thisfile_au['encoding'] = 'ISO-8859-1'; + + $thisfile_au['header_length'] = getid3_lib::BigEndian2Int(substr($AUheader, 4, 4)); + $AUheader .= fread($fd, $thisfile_au['header_length'] - 8); + $ThisFileInfo['avdataoffset'] += $thisfile_au['header_length']; + + $thisfile_au['data_size'] = getid3_lib::BigEndian2Int(substr($AUheader, 8, 4)); + $thisfile_au['data_format_id'] = getid3_lib::BigEndian2Int(substr($AUheader, 12, 4)); + $thisfile_au['sample_rate'] = getid3_lib::BigEndian2Int(substr($AUheader, 16, 4)); + $thisfile_au['channels'] = getid3_lib::BigEndian2Int(substr($AUheader, 20, 4)); + $thisfile_au['comments']['comment'][] = trim(substr($AUheader, 24)); + + $thisfile_au['data_format'] = $this->AUdataFormatNameLookup($thisfile_au['data_format_id']); + $thisfile_au['used_bits_per_sample'] = $this->AUdataFormatUsedBitsPerSampleLookup($thisfile_au['data_format_id']); + if ($thisfile_au['bits_per_sample'] = $this->AUdataFormatBitsPerSampleLookup($thisfile_au['data_format_id'])) { + $ThisFileInfo['audio']['bits_per_sample'] = $thisfile_au['bits_per_sample']; + } else { + unset($thisfile_au['bits_per_sample']); + } + + $ThisFileInfo['audio']['sample_rate'] = $thisfile_au['sample_rate']; + $ThisFileInfo['audio']['channels'] = $thisfile_au['channels']; + + if (($ThisFileInfo['avdataoffset'] + $thisfile_au['data_size']) > $ThisFileInfo['avdataend']) { + $ThisFileInfo['warning'][] = 'Possible truncated file - expecting "'.$thisfile_au['data_size'].'" bytes of audio data, only found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' bytes"'; + } + + $ThisFileInfo['playtime_seconds'] = $thisfile_au['data_size'] / ($thisfile_au['sample_rate'] * $thisfile_au['channels'] * ($thisfile_au['used_bits_per_sample'] / 8)); + $ThisFileInfo['audio']['bitrate'] = ($thisfile_au['data_size'] * 8) / $ThisFileInfo['playtime_seconds']; + + return true; + } + + function AUdataFormatNameLookup($id) { + static $AUdataFormatNameLookup = array( + 0 => 'unspecified format', + 1 => '8-bit mu-law', + 2 => '8-bit linear', + 3 => '16-bit linear', + 4 => '24-bit linear', + 5 => '32-bit linear', + 6 => 'floating-point', + 7 => 'double-precision float', + 8 => 'fragmented sampled data', + 9 => 'SUN_FORMAT_NESTED', + 10 => 'DSP program', + 11 => '8-bit fixed-point', + 12 => '16-bit fixed-point', + 13 => '24-bit fixed-point', + 14 => '32-bit fixed-point', + + 16 => 'non-audio display data', + 17 => 'SND_FORMAT_MULAW_SQUELCH', + 18 => '16-bit linear with emphasis', + 19 => '16-bit linear with compression', + 20 => '16-bit linear with emphasis + compression', + 21 => 'Music Kit DSP commands', + 22 => 'SND_FORMAT_DSP_COMMANDS_SAMPLES', + 23 => 'CCITT g.721 4-bit ADPCM', + 24 => 'CCITT g.722 ADPCM', + 25 => 'CCITT g.723 3-bit ADPCM', + 26 => 'CCITT g.723 5-bit ADPCM', + 27 => 'A-Law 8-bit' + ); + return (isset($AUdataFormatNameLookup[$id]) ? $AUdataFormatNameLookup[$id] : false); + } + + function AUdataFormatBitsPerSampleLookup($id) { + static $AUdataFormatBitsPerSampleLookup = array( + 1 => 8, + 2 => 8, + 3 => 16, + 4 => 24, + 5 => 32, + 6 => 32, + 7 => 64, + + 11 => 8, + 12 => 16, + 13 => 24, + 14 => 32, + + 18 => 16, + 19 => 16, + 20 => 16, + + 23 => 16, + + 25 => 16, + 26 => 16, + 27 => 8 + ); + return (isset($AUdataFormatBitsPerSampleLookup[$id]) ? $AUdataFormatBitsPerSampleLookup[$id] : false); + } + + function AUdataFormatUsedBitsPerSampleLookup($id) { + static $AUdataFormatUsedBitsPerSampleLookup = array( + 1 => 8, + 2 => 8, + 3 => 16, + 4 => 24, + 5 => 32, + 6 => 32, + 7 => 64, + + 11 => 8, + 12 => 16, + 13 => 24, + 14 => 32, + + 18 => 16, + 19 => 16, + 20 => 16, + + 23 => 4, + + 25 => 3, + 26 => 5, + 27 => 8, + ); + return (isset($AUdataFormatUsedBitsPerSampleLookup[$id]) ? $AUdataFormatUsedBitsPerSampleLookup[$id] : false); + } + +} + + +?>
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