getid3_rkau Class Reference

getID3() by James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g // More...

Collaboration diagram for getid3_rkau:

Public Member Functions
	getid3_rkau (&$fd, &$ThisFileInfo)
	RKAUqualityLookup (&$RKAUdata)

Detailed Description

getID3() by James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g //

Definition at line 17 of file module.audio.rkau.php.

Member Function Documentation

getid3_rkau::getid3_rkau	(	&	$fd,
		&	$ThisFileInfo
	)

Definition at line 20 of file module.audio.rkau.php.

References getid3_lib\LittleEndian2Int(), and RKAUqualityLookup().

                                                   {

                fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
                $RKAUHeader = fread($fd, 20);
                if (substr($RKAUHeader, 0, 3) != 'RKA') {
                        $ThisFileInfo['error'][] = 'Expecting "RKA" at offset '.$ThisFileInfo['avdataoffset'].', found "'.substr($RKAUHeader, 0, 3).'"';
                        return false;
                }

                $ThisFileInfo['fileformat']            = 'rkau';
                $ThisFileInfo['audio']['dataformat']   = 'rkau';
                $ThisFileInfo['audio']['bitrate_mode'] = 'vbr';

                $ThisFileInfo['rkau']['raw']['version']   = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 3, 1));
                $ThisFileInfo['rkau']['version']          = '1.'.str_pad($ThisFileInfo['rkau']['raw']['version'] & 0x0F, 2, '0', STR_PAD_LEFT);
                if (($ThisFileInfo['rkau']['version'] > 1.07) || ($ThisFileInfo['rkau']['version'] < 1.06)) {
                        $ThisFileInfo['error'][] = 'This version of getID3() can only parse RKAU files v1.06 and 1.07 (this file is v'.$ThisFileInfo['rkau']['version'].')';
                        unset($ThisFileInfo['rkau']);
                        return false;
                }

                $ThisFileInfo['rkau']['source_bytes']     = getid3_lib::LittleEndian2Int(substr($RKAUHeader,  4, 4));
                $ThisFileInfo['rkau']['sample_rate']      = getid3_lib::LittleEndian2Int(substr($RKAUHeader,  8, 4));
                $ThisFileInfo['rkau']['channels']         = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 12, 1));
                $ThisFileInfo['rkau']['bits_per_sample']  = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 13, 1));

                $ThisFileInfo['rkau']['raw']['quality']   = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 14, 1));
                $this->RKAUqualityLookup($ThisFileInfo['rkau']);

                $ThisFileInfo['rkau']['raw']['flags']            = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 15, 1));
                $ThisFileInfo['rkau']['flags']['joint_stereo']   = (bool) (!($ThisFileInfo['rkau']['raw']['flags'] & 0x01));
                $ThisFileInfo['rkau']['flags']['streaming']      =  (bool)  ($ThisFileInfo['rkau']['raw']['flags'] & 0x02);
                $ThisFileInfo['rkau']['flags']['vrq_lossy_mode'] =  (bool)  ($ThisFileInfo['rkau']['raw']['flags'] & 0x04);

                if ($ThisFileInfo['rkau']['flags']['streaming']) {
                        $ThisFileInfo['avdataoffset'] += 20;
                        $ThisFileInfo['rkau']['compressed_bytes']  = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 16, 4));
                } else {
                        $ThisFileInfo['avdataoffset'] += 16;
                        $ThisFileInfo['rkau']['compressed_bytes'] = $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'] - 1;
                }
                // Note: compressed_bytes does not always equal what appears to be the actual number of compressed bytes,
                // sometimes it's more, sometimes less. No idea why(?)

                $ThisFileInfo['audio']['lossless']        = $ThisFileInfo['rkau']['lossless'];
                $ThisFileInfo['audio']['channels']        = $ThisFileInfo['rkau']['channels'];
                $ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['rkau']['bits_per_sample'];
                $ThisFileInfo['audio']['sample_rate']     = $ThisFileInfo['rkau']['sample_rate'];

                $ThisFileInfo['playtime_seconds']         = $ThisFileInfo['rkau']['source_bytes'] / ($ThisFileInfo['rkau']['sample_rate'] * $ThisFileInfo['rkau']['channels'] * ($ThisFileInfo['rkau']['bits_per_sample'] / 8));
                $ThisFileInfo['audio']['bitrate']         = ($ThisFileInfo['rkau']['compressed_bytes'] * 8) / $ThisFileInfo['playtime_seconds'];

                return true;

        }

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getid3_rkau::RKAUqualityLookup

(

&

$RKAUdata

)

Definition at line 77 of file module.audio.rkau.php.

Referenced by getid3_rkau().

                                               {
                $level   = ($RKAUdata['raw']['quality'] & 0xF0) >> 4;
                $quality =  $RKAUdata['raw']['quality'] & 0x0F;

                $RKAUdata['lossless']          = (($quality == 0) ? true : false);
                $RKAUdata['compression_level'] = $level + 1;
                if (!$RKAUdata['lossless']) {
                        $RKAUdata['quality_setting'] = $quality;
                }

                return true;
        }

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The documentation for this class was generated from the following file:

• Services/MediaObjects/getid3/getid3/module.audio.rkau.php