<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
//          also https://github.com/JamesHeinrich/getID3       //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details                             //
/////////////////////////////////////////////////////////////////
//                                                             //
// module.audio.dsf.php                                        //
// module for analyzing dsf/DSF Audio files                    //
// dependencies: module.tag.id3v2.php                          //
//                                                            ///
/////////////////////////////////////////////////////////////////

getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.tag.id3v2.php'__FILE__true);

class 
getid3_dsf extends getid3_handler
{

    public function 
Analyze() {
        
$info = &$this->getid3->info;

        
$info['fileformat']            = 'dsf';
        
$info['audio']['dataformat']   = 'dsf';
        
$info['audio']['lossless']     = true;
        
$info['audio']['bitrate_mode'] = 'cbr';

        
$this->fseek($info['avdataoffset']);
        
$dsfheader $this->fread(28 12);

        
$headeroffset 0;
        
$info['dsf']['dsd']['magic'] = substr($dsfheader$headeroffset4);
        
$headeroffset += 4;
        
$magic 'DSD ';
        if (
$info['dsf']['dsd']['magic'] != $magic) {
            
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['dsf']['dsd']['magic']).'"';
            unset(
$info['fileformat']);
            unset(
$info['audio']);
            unset(
$info['dsf']);
            return 
false;
        }
        
$info['dsf']['dsd']['dsd_chunk_size']     = getid3_lib::LittleEndian2Int(substr($dsfheader$headeroffset8)); // should be 28
        
$headeroffset += 8;
        
$info['dsf']['dsd']['dsf_file_size']      = getid3_lib::LittleEndian2Int(substr($dsfheader$headeroffset8));
        
$headeroffset += 8;
        
$info['dsf']['dsd']['meta_chunk_offset']  = getid3_lib::LittleEndian2Int(substr($dsfheader$headeroffset8));
        
$headeroffset += 8;


        
$info['dsf']['fmt']['magic'] = substr($dsfheader$headeroffset4);
        
$headeroffset += 4;
        
$magic 'fmt ';
        if (
$info['dsf']['fmt']['magic'] != $magic) {
            
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$headeroffset.', found "'.getid3_lib::PrintHexBytes($info['dsf']['fmt']['magic']).'"';
            return 
false;
        }
        
$info['dsf']['fmt']['fmt_chunk_size']     = getid3_lib::LittleEndian2Int(substr($dsfheader$headeroffset8));  // usually 52 bytes
        
$headeroffset += 8;
        
$dsfheader .= $this->fread($info['dsf']['fmt']['fmt_chunk_size'] - 12 12);  // we have already read the entire DSD chunk, plus 12 bytes of FMT. We now want to read the size of FMT, plus 12 bytes into the next chunk to get magic and size.
        
if (strlen($dsfheader) != ($info['dsf']['dsd']['dsd_chunk_size'] + $info['dsf']['fmt']['fmt_chunk_size'] + 12)) {
            
$info['error'][] = 'Expecting '.($info['dsf']['dsd']['dsd_chunk_size'] + $info['dsf']['fmt']['fmt_chunk_size']).' bytes header, found '.strlen($dsfheader).' bytes';
            return 
false;
        }
        
$info['dsf']['fmt']['format_version']     = getid3_lib::LittleEndian2Int(substr($dsfheader$headeroffset4));  // usually "1"
        
$headeroffset += 4;
        
$info['dsf']['fmt']['format_id']          = getid3_lib::LittleEndian2Int(substr($dsfheader$headeroffset4));  // usually "0" = "DSD Raw"
        
$headeroffset += 4;
        
$info['dsf']['fmt']['channel_type_id']    = getid3_lib::LittleEndian2Int(substr($dsfheader$headeroffset4));
        
$headeroffset += 4;
        
$info['dsf']['fmt']['channels']           = getid3_lib::LittleEndian2Int(substr($dsfheader$headeroffset4));
        
$headeroffset += 4;
        
$info['dsf']['fmt']['sample_rate']        = getid3_lib::LittleEndian2Int(substr($dsfheader$headeroffset4));
        
$headeroffset += 4;
        
$info['dsf']['fmt']['bits_per_sample']    = getid3_lib::LittleEndian2Int(substr($dsfheader$headeroffset4));
        
$headeroffset += 4;
        
$info['dsf']['fmt']['sample_count']       = getid3_lib::LittleEndian2Int(substr($dsfheader$headeroffset8));
        
$headeroffset += 8;
        
$info['dsf']['fmt']['channel_block_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader$headeroffset4));
        
$headeroffset += 4;
        
$info['dsf']['fmt']['reserved']           = getid3_lib::LittleEndian2Int(substr($dsfheader$headeroffset4)); // zero-filled
        
$headeroffset += 4;


        
$info['dsf']['data']['magic'] = substr($dsfheader$headeroffset4);
        
$headeroffset += 4;
        
$magic 'data';
        if (
$info['dsf']['data']['magic'] != $magic) {
            
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$headeroffset.', found "'.getid3_lib::PrintHexBytes($info['dsf']['data']['magic']).'"';
            return 
false;
        }
        
$info['dsf']['data']['data_chunk_size']    = getid3_lib::LittleEndian2Int(substr($dsfheader$headeroffset8));
        
$headeroffset += 8;
        
$info['avdataoffset'] = $headeroffset;
        
$info['avdataend']    = $info['avdataoffset'] + $info['dsf']['data']['data_chunk_size'];


        if (
$info['dsf']['dsd']['meta_chunk_offset'] > 0) {
            
$getid3_id3v2 = new getid3_id3v2($this->getid3);
            
$getid3_id3v2->StartingOffset $info['dsf']['dsd']['meta_chunk_offset'];
            
$getid3_id3v2->Analyze();
            unset(
$getid3_id3v2);
        }


        
$info['dsf']['fmt']['channel_type'] = $this->DSFchannelTypeLookup($info['dsf']['fmt']['channel_type_id']);
        
$info['audio']['channelmode']       = $info['dsf']['fmt']['channel_type'];
        
$info['audio']['bits_per_sample']   = $info['dsf']['fmt']['bits_per_sample'];
        
$info['audio']['sample_rate']       = $info['dsf']['fmt']['sample_rate'];
        
$info['audio']['channels']          = $info['dsf']['fmt']['channels'];
        
$info['audio']['bitrate']           = $info['audio']['bits_per_sample'] * $info['audio']['sample_rate'] * $info['audio']['channels'];
        
$info['playtime_seconds']           = ($info['dsf']['data']['data_chunk_size'] * 8) / $info['audio']['bitrate'];

        return 
true;
    }


    public static function 
DSFchannelTypeLookup($channel_type_id) {
        static 
$DSFchannelTypeLookup = array(
                              
// interleaving order:
            
=> 'mono',      // 1: Mono
            
=> 'stereo',    // 1: Front-Left; 2: Front-Right
            
=> '3-channel'// 1: Front-Left; 2: Front-Right; 3: Center
            
=> 'quad',      // 1: Front-Left; 2: Front-Right; 3: Back-Left; 4: Back-Right
            
=> '4-channel'// 1: Front-Left; 2: Front-Right; 3: Center;    4: Low-Frequency
            
=> '5-channel'// 1: Front-Left; 2: Front-Right; 3: Center;    4: Back-Left      5: Back-Right
            
=> '5.1',       // 1: Front-Left; 2: Front-Right; 3: Center;    4: Low-Frequency; 5: Back-Left;  6: Back-Right
        
);
        return (isset(
$DSFchannelTypeLookup[$channel_type_id]) ? $DSFchannelTypeLookup[$channel_type_id] : '');
    }

}