getid3_tta Class Reference

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

Inheritance diagram for getid3_tta:

Collaboration diagram for getid3_tta:

Public Member Functions
	Analyze ()
Public Member Functions inherited from getid3_handler
	__construct (getID3 $getid3, $call_module=null)
	Analyze ()
	AnalyzeString ($string)
	setStringMode ($string)
	saveAttachment ($name, $offset, $length, $image_mime=null)

Additional Inherited Members
Protected Member Functions inherited from getid3_handler
	ftell ()
	fread ($bytes)
	fseek ($bytes, $whence=SEEK_SET)
	feof ()
	isDependencyFor ($module)
	error ($text)
	warning ($text)
	notice ($text)
Protected Attributes inherited from getid3_handler
	$getid3
	$data_string_flag = false
	$data_string = ''
	$data_string_position = 0
	$data_string_length = 0

Detailed Description

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

Definition at line 18 of file module.audio.tta.php.

Member Function Documentation

Analyze()

getid3_tta::Analyze

(

)

Reimplemented from getid3_handler.

Definition at line 21 of file module.audio.tta.php.

                                  {
                $info = &$this->getid3->info;
 
                $info['fileformat']            = 'tta';
                $info['audio']['dataformat']   = 'tta';
                $info['audio']['lossless']     = true;
                $info['audio']['bitrate_mode'] = 'vbr';
 
                $this->fseek($info['avdataoffset']);
                $ttaheader = $this->fread(26);
 
                $info['tta']['magic'] = substr($ttaheader, 0, 3);
                $magic = 'TTA';
                if ($info['tta']['magic'] != $magic) {
                        $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['tta']['magic']).'"');
                        unset($info['fileformat']);
                        unset($info['audio']);
                        unset($info['tta']);
                        return false;
                }
 
                switch ($ttaheader{3}) {
                        case "\x01": // TTA v1.x
                        case "\x02": // TTA v1.x
                        case "\x03": // TTA v1.x
                                // "It was the demo-version of the TTA encoder. There is no released format with such header. TTA encoder v1 is not supported about a year."
                                $info['tta']['major_version'] = 1;
                                $info['avdataoffset'] += 16;
 
                                $info['tta']['compression_level']   = ord($ttaheader{3});
                                $info['tta']['channels']            = getid3_lib::LittleEndian2Int(substr($ttaheader,  4,  2));
                                $info['tta']['bits_per_sample']     = getid3_lib::LittleEndian2Int(substr($ttaheader,  6,  2));
                                $info['tta']['sample_rate']         = getid3_lib::LittleEndian2Int(substr($ttaheader,  8,  4));
                                $info['tta']['samples_per_channel'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 12,  4));
 
                                $info['audio']['encoder_options']   = '-e'.$info['tta']['compression_level'];
                                $info['playtime_seconds']           = $info['tta']['samples_per_channel'] / $info['tta']['sample_rate'];
                                break;
 
                        case '2': // TTA v2.x
                                // "I have hurried to release the TTA 2.0 encoder. Format documentation is removed from our site. This format still in development. Please wait the TTA2 format, encoder v4."
                                $info['tta']['major_version'] = 2;
                                $info['avdataoffset'] += 20;
 
                                $info['tta']['compression_level']   = getid3_lib::LittleEndian2Int(substr($ttaheader,  4,  2));
                                $info['tta']['audio_format']        = getid3_lib::LittleEndian2Int(substr($ttaheader,  6,  2));
                                $info['tta']['channels']            = getid3_lib::LittleEndian2Int(substr($ttaheader,  8,  2));
                                $info['tta']['bits_per_sample']     = getid3_lib::LittleEndian2Int(substr($ttaheader, 10,  2));
                                $info['tta']['sample_rate']         = getid3_lib::LittleEndian2Int(substr($ttaheader, 12,  4));
                                $info['tta']['data_length']         = getid3_lib::LittleEndian2Int(substr($ttaheader, 16,  4));
 
                                $info['audio']['encoder_options']   = '-e'.$info['tta']['compression_level'];
                                $info['playtime_seconds']           = $info['tta']['data_length'] / $info['tta']['sample_rate'];
                                break;
 
                        case '1': // TTA v3.x
                                // "This is a first stable release of the TTA format. It will be supported by the encoders v3 or higher."
                                $info['tta']['major_version'] = 3;
                                $info['avdataoffset'] += 26;
 
                                $info['tta']['audio_format']        = getid3_lib::LittleEndian2Int(substr($ttaheader,  4,  2)); // getid3_riff::wFormatTagLookup()
                                $info['tta']['channels']            = getid3_lib::LittleEndian2Int(substr($ttaheader,  6,  2));
                                $info['tta']['bits_per_sample']     = getid3_lib::LittleEndian2Int(substr($ttaheader,  8,  2));
                                $info['tta']['sample_rate']         = getid3_lib::LittleEndian2Int(substr($ttaheader, 10,  4));
                                $info['tta']['data_length']         = getid3_lib::LittleEndian2Int(substr($ttaheader, 14,  4));
                                $info['tta']['crc32_footer']        =                              substr($ttaheader, 18,  4);
                                $info['tta']['seek_point']          = getid3_lib::LittleEndian2Int(substr($ttaheader, 22,  4));
 
                                $info['playtime_seconds']           = $info['tta']['data_length'] / $info['tta']['sample_rate'];
                                break;
 
                        default:
                                $this->error('This version of getID3() ['.$this->getid3->version().'] only knows how to handle TTA v1 and v2 - it may not work correctly with this file which appears to be TTA v'.$ttaheader{3});
                                return false;
                                break;
                }
 
                $info['audio']['encoder']         = 'TTA v'.$info['tta']['major_version'];
                $info['audio']['bits_per_sample'] = $info['tta']['bits_per_sample'];
                $info['audio']['sample_rate']     = $info['tta']['sample_rate'];
                $info['audio']['channels']        = $info['tta']['channels'];
                $info['audio']['bitrate']         = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
 
                return true;
        }

References $info, getid3_handler\error(), getid3_handler\fread(), getid3_handler\fseek(), getid3_lib\LittleEndian2Int(), and getid3_lib\PrintHexBytes().

Here is the call graph for this function:

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

• libs/composer/vendor/james-heinrich/getid3/getid3/module.audio.tta.php