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File: /lib/module.audio.aac.php

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<?php
















class getid3_aac extends getid3_handler
{
public function 
Analyze() {
$info = &$this->getid3->info;
$this->fseek($info['avdataoffset']);
if (
$this->fread(4) == 'ADIF') {
$this->getAACADIFheaderFilepointer();
} else {
$this->getAACADTSheaderFilepointer();
}
return 
true;
}



public function 
getAACADIFheaderFilepointer() {
$info = &$this->getid3->info;
$info['fileformat'] = 'aac';
$info['audio']['dataformat'] = 'aac';
$info['audio']['lossless'] = false;

$this->fseek($info['avdataoffset']);
$AACheader $this->fread(1024);
$offset 0;

if (
substr($AACheader04) == 'ADIF') {




 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

$AACheaderBitstream getid3_lib::BigEndian2Bin($AACheader);
$bitoffset 0;

$info['aac']['header_type'] = 'ADIF';
$bitoffset += 32;
$info['aac']['header']['mpeg_version'] = 4;

$info['aac']['header']['copyright'] = (bool) (substr($AACheaderBitstream$bitoffset1) == '1');
$bitoffset += 1;
if (
$info['aac']['header']['copyright']) {
$info['aac']['header']['copyright_id'] = getid3_lib::Bin2String(substr($AACheaderBitstream$bitoffset72));
$bitoffset += 72;
}
$info['aac']['header']['original_copy'] = (bool) (substr($AACheaderBitstream$bitoffset1) == '1');
$bitoffset += 1;
$info['aac']['header']['home'] = (bool) (substr($AACheaderBitstream$bitoffset1) == '1');
$bitoffset += 1;
$info['aac']['header']['is_vbr'] = (bool) (substr($AACheaderBitstream$bitoffset1) == '1');
$bitoffset += 1;
if (
$info['aac']['header']['is_vbr']) {
$info['audio']['bitrate_mode'] = 'vbr';
$info['aac']['header']['bitrate_max'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset23));
$bitoffset += 23;
} else {
$info['audio']['bitrate_mode'] = 'cbr';
$info['aac']['header']['bitrate'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset23));
$bitoffset += 23;
$info['audio']['bitrate'] = $info['aac']['header']['bitrate'];
}
if (
$info['audio']['bitrate'] == 0) {
$info['error'][] = 'Corrupt AAC file: bitrate_audio == zero';
return 
false;
}
$info['aac']['header']['num_program_configs'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset4));
$bitoffset += 4;

for (
$i 0$i $info['aac']['header']['num_program_configs']; $i++) {





 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

if (!
$info['aac']['header']['is_vbr']) {
$info['aac']['program_configs'][$i]['buffer_fullness'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset20));
$bitoffset += 20;
}
$info['aac']['program_configs'][$i]['element_instance_tag'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset4));
$bitoffset += 4;
$info['aac']['program_configs'][$i]['object_type'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset2));
$bitoffset += 2;
$info['aac']['program_configs'][$i]['sampling_frequency_index'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset4));
$bitoffset += 4;
$info['aac']['program_configs'][$i]['num_front_channel_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset4));
$bitoffset += 4;
$info['aac']['program_configs'][$i]['num_side_channel_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset4));
$bitoffset += 4;
$info['aac']['program_configs'][$i]['num_back_channel_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset4));
$bitoffset += 4;
$info['aac']['program_configs'][$i]['num_lfe_channel_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset2));
$bitoffset += 2;
$info['aac']['program_configs'][$i]['num_assoc_data_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset3));
$bitoffset += 3;
$info['aac']['program_configs'][$i]['num_valid_cc_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset4));
$bitoffset += 4;
$info['aac']['program_configs'][$i]['mono_mixdown_present'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset1));
$bitoffset += 1;
if (
$info['aac']['program_configs'][$i]['mono_mixdown_present']) {
$info['aac']['program_configs'][$i]['mono_mixdown_element_number'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset4));
$bitoffset += 4;
}
$info['aac']['program_configs'][$i]['stereo_mixdown_present'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset1));
$bitoffset += 1;
if (
$info['aac']['program_configs'][$i]['stereo_mixdown_present']) {
$info['aac']['program_configs'][$i]['stereo_mixdown_element_number'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset4));
$bitoffset += 4;
}
$info['aac']['program_configs'][$i]['matrix_mixdown_idx_present'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset1));
$bitoffset += 1;
if (
$info['aac']['program_configs'][$i]['matrix_mixdown_idx_present']) {
$info['aac']['program_configs'][$i]['matrix_mixdown_idx'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset2));
$bitoffset += 2;
$info['aac']['program_configs'][$i]['pseudo_surround_enable'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset1));
$bitoffset += 1;
}
for (
$j 0$j $info['aac']['program_configs'][$i]['num_front_channel_elements']; $j++) {
$info['aac']['program_configs'][$i]['front_element_is_cpe'][$j] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset1));
$bitoffset += 1;
$info['aac']['program_configs'][$i]['front_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset4));
$bitoffset += 4;
}
for (
$j 0$j $info['aac']['program_configs'][$i]['num_side_channel_elements']; $j++) {
$info['aac']['program_configs'][$i]['side_element_is_cpe'][$j] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset1));
$bitoffset += 1;
$info['aac']['program_configs'][$i]['side_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset4));
$bitoffset += 4;
}
for (
$j 0$j $info['aac']['program_configs'][$i]['num_back_channel_elements']; $j++) {
$info['aac']['program_configs'][$i]['back_element_is_cpe'][$j] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset1));
$bitoffset += 1;
$info['aac']['program_configs'][$i]['back_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset4));
$bitoffset += 4;
}
for (
$j 0$j $info['aac']['program_configs'][$i]['num_lfe_channel_elements']; $j++) {
$info['aac']['program_configs'][$i]['lfe_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset4));
$bitoffset += 4;
}
for (
$j 0$j $info['aac']['program_configs'][$i]['num_assoc_data_elements']; $j++) {
$info['aac']['program_configs'][$i]['assoc_data_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset4));
$bitoffset += 4;
}
for (
$j 0$j $info['aac']['program_configs'][$i]['num_valid_cc_elements']; $j++) {
$info['aac']['program_configs'][$i]['cc_element_is_ind_sw'][$j] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset1));
$bitoffset += 1;
$info['aac']['program_configs'][$i]['valid_cc_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset4));
$bitoffset += 4;
}

$bitoffset ceil($bitoffset 8) * 8;

$info['aac']['program_configs'][$i]['comment_field_bytes'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream$bitoffset8));
$bitoffset += 8;
$info['aac']['program_configs'][$i]['comment_field'] = getid3_lib::Bin2String(substr($AACheaderBitstream$bitoffset$info['aac']['program_configs'][$i]['comment_field_bytes']));
$bitoffset += $info['aac']['program_configs'][$i]['comment_field_bytes'];


$info['aac']['header']['profile'] = self::AACprofileLookup($info['aac']['program_configs'][$i]['object_type'], $info['aac']['header']['mpeg_version']);
$info['aac']['program_configs'][$i]['sampling_frequency'] = self::AACsampleRateLookup($info['aac']['program_configs'][$i]['sampling_frequency_index']);
$info['audio']['sample_rate'] = $info['aac']['program_configs'][$i]['sampling_frequency'];
$info['audio']['channels'] = self::AACchannelCountCalculate($info['aac']['program_configs'][$i]);
if (
$info['aac']['program_configs'][$i]['comment_field']) {
$info['aac']['comments'][] = $info['aac']['program_configs'][$i]['comment_field'];
}
}
$info['playtime_seconds'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['audio']['bitrate'];

$info['audio']['encoder_options'] = $info['aac']['header_type'].' '.$info['aac']['header']['profile'];



return 
true;

} else {

unset(
$info['fileformat']);
unset(
$info['aac']);
$info['error'][] = 'AAC-ADIF synch not found at offset '.$info['avdataoffset'].' (expected "ADIF", found "'.substr($AACheader04).'" instead)';
return 
false;

}

}


public function 
getAACADTSheaderFilepointer($MaxFramesToScan=1000000$ReturnExtendedInfo=false) {
$info = &$this->getid3->info;


 



 


 
 
 
 
 
 
 
 
 
 
 


 
 
 
 
 


 

$byteoffset $info['avdataoffset'];
$framenumber 0;


 static 
$decbin = array();


 for (
$i 0$i 256$i++) {
$decbin[chr($i)] = str_pad(decbin($i), 8'0'STR_PAD_LEFT);
}


 
$BitrateCache = array();


while (
true) {

 

if (!
getid3_lib::intValueSupported($byteoffset)) {
$info['warning'][] = 'Unable to parse AAC file beyond '.$this->ftell().' (PHP does not support file operations beyond '.round(PHP_INT_MAX 1073741824).'GB)';
return 
false;
}
$this->fseek($byteoffset);


 
$substring $this->fread(9); 
 
$substringlength strlen($substring);
if (
$substringlength != 9) {
$info['error'][] = 'Failed to read 7 bytes at offset '.($this->ftell() - $substringlength).' (only read '.$substringlength.' bytes)';
return 
false;
}

 
$header1 getid3_lib::BigEndian2Int(substr($substring02));
$header2 getid3_lib::BigEndian2Int(substr($substring24));
$header3 getid3_lib::BigEndian2Int(substr($substring61));

$info['aac']['header']['raw']['syncword'] = ($header1 0xFFF0) >> 4;
if (
$info['aac']['header']['raw']['syncword'] != 0x0FFF) {
$info['error'][] = 'Synch pattern (0x0FFF) not found at offset '.($this->ftell() - $substringlength).' (found 0x0'.strtoupper(dechex($info['aac']['header']['raw']['syncword'])).' instead)';

 
 
 unset(
$info['aac']);
return 
false;
}


 if (
$framenumber == 0) {
$info['aac']['header_type'] = 'ADTS';
$info['fileformat'] = 'aac';
$info['audio']['dataformat'] = 'aac';

$info['aac']['header']['raw']['mpeg_version'] = ($header1 0x0008) >> 3;
$info['aac']['header']['raw']['mpeg_layer'] = ($header1 0x0006) >> 1;
$info['aac']['header']['raw']['protection_absent'] = ($header1 0x0001) >> 0;

$info['aac']['header']['raw']['profile_code'] = ($header2 0xC0000000) >> 30;
$info['aac']['header']['raw']['sample_rate_code'] = ($header2 0x3C000000) >> 26;
$info['aac']['header']['raw']['private_stream'] = ($header2 0x02000000) >> 25;
$info['aac']['header']['raw']['channels_code'] = ($header2 0x01C00000) >> 22;
$info['aac']['header']['raw']['original'] = ($header2 0x00200000) >> 21;
$info['aac']['header']['raw']['home'] = ($header2 0x00100000) >> 20;
$info['aac']['header']['raw']['copyright_stream'] = ($header2 0x00080000) >> 19;
$info['aac']['header']['raw']['copyright_start'] = ($header2 0x00040000) >> 18;
$info['aac']['header']['raw']['frame_length'] = ($header2 0x0003FFE0) >> 5;

$info['aac']['header']['mpeg_version'] = ($info['aac']['header']['raw']['mpeg_version'] ? 4);
$info['aac']['header']['crc_present'] = ($info['aac']['header']['raw']['protection_absent'] ? falsetrue);
$info['aac']['header']['profile'] = self::AACprofileLookup($info['aac']['header']['raw']['profile_code'], $info['aac']['header']['mpeg_version']);
$info['aac']['header']['sample_frequency'] = self::AACsampleRateLookup($info['aac']['header']['raw']['sample_rate_code']);
$info['aac']['header']['private'] = (bool) $info['aac']['header']['raw']['private_stream'];
$info['aac']['header']['original'] = (bool) $info['aac']['header']['raw']['original'];
$info['aac']['header']['home'] = (bool) $info['aac']['header']['raw']['home'];
$info['aac']['header']['channels'] = (($info['aac']['header']['raw']['channels_code'] == 7) ? $info['aac']['header']['raw']['channels_code']);
if (
$ReturnExtendedInfo) {
$info['aac'][$framenumber]['copyright_id_bit'] = (bool) $info['aac']['header']['raw']['copyright_stream'];
$info['aac'][$framenumber]['copyright_id_start'] = (bool) $info['aac']['header']['raw']['copyright_start'];
}

if (
$info['aac']['header']['raw']['mpeg_layer'] != 0) {
$info['warning'][] = 'Layer error - expected "0", found "'.$info['aac']['header']['raw']['mpeg_layer'].'" instead';
}
if (
$info['aac']['header']['sample_frequency'] == 0) {
$info['error'][] = 'Corrupt AAC file: sample_frequency == zero';
return 
false;
}

$info['audio']['sample_rate'] = $info['aac']['header']['sample_frequency'];
$info['audio']['channels'] = $info['aac']['header']['channels'];
}

$FrameLength = ($header2 0x0003FFE0) >> 5;

if (!isset(
$BitrateCache[$FrameLength])) {
$BitrateCache[$FrameLength] = ($info['aac']['header']['sample_frequency'] / 1024) * $FrameLength 8;
}
getid3_lib::safe_inc($info['aac']['bitrate_distribution'][$BitrateCache[$FrameLength]], 1);

$info['aac'][$framenumber]['aac_frame_length'] = $FrameLength;

$info['aac'][$framenumber]['adts_buffer_fullness'] = (($header2 0x0000001F) << 6) & (($header3 0xFC) >> 2);
if (
$info['aac'][$framenumber]['adts_buffer_fullness'] == 0x07FF) {
$info['audio']['bitrate_mode'] = 'vbr';
} else {
$info['audio']['bitrate_mode'] = 'cbr';
}
$info['aac'][$framenumber]['num_raw_data_blocks'] = (($header3 0x03) >> 0);

if (
$info['aac']['header']['crc_present']) {

 }

if (!
$ReturnExtendedInfo) {
unset(
$info['aac'][$framenumber]);
}











$byteoffset += $FrameLength;
if ((++
$framenumber $MaxFramesToScan) && (($byteoffset 10) < $info['avdataend'])) {



} else {

$info['aac']['frames'] = $framenumber;
$info['playtime_seconds'] = ($info['avdataend'] / $byteoffset) * (($framenumber 1024) / $info['aac']['header']['sample_frequency']); 
 if (
$info['playtime_seconds'] == 0) {
$info['error'][] = 'Corrupt AAC file: playtime_seconds == zero';
return 
false;
}
$info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
ksort($info['aac']['bitrate_distribution']);

$info['audio']['encoder_options'] = $info['aac']['header_type'].' '.$info['aac']['header']['profile'];

return 
true;

}
}

 }

public static function 
AACsampleRateLookup($samplerateid) {
static 
$AACsampleRateLookup = array();
if (empty(
$AACsampleRateLookup)) {
$AACsampleRateLookup[0] = 96000;
$AACsampleRateLookup[1] = 88200;
$AACsampleRateLookup[2] = 64000;
$AACsampleRateLookup[3] = 48000;
$AACsampleRateLookup[4] = 44100;
$AACsampleRateLookup[5] = 32000;
$AACsampleRateLookup[6] = 24000;
$AACsampleRateLookup[7] = 22050;
$AACsampleRateLookup[8] = 16000;
$AACsampleRateLookup[9] = 12000;
$AACsampleRateLookup[10] = 11025;
$AACsampleRateLookup[11] = 8000;
$AACsampleRateLookup[12] = 0;
$AACsampleRateLookup[13] = 0;
$AACsampleRateLookup[14] = 0;
$AACsampleRateLookup[15] = 0;
}
return (isset(
$AACsampleRateLookup[$samplerateid]) ? $AACsampleRateLookup[$samplerateid] : 'invalid');
}

public static function 
AACprofileLookup($profileid$mpegversion) {
static 
$AACprofileLookup = array();
if (empty(
$AACprofileLookup)) {
$AACprofileLookup[2][0] = 'Main profile';
$AACprofileLookup[2][1] = 'Low Complexity profile (LC)';
$AACprofileLookup[2][2] = 'Scalable Sample Rate profile (SSR)';
$AACprofileLookup[2][3] = '(reserved)';
$AACprofileLookup[4][0] = 'AAC_MAIN';
$AACprofileLookup[4][1] = 'AAC_LC';
$AACprofileLookup[4][2] = 'AAC_SSR';
$AACprofileLookup[4][3] = 'AAC_LTP';
}
return (isset(
$AACprofileLookup[$mpegversion][$profileid]) ? $AACprofileLookup[$mpegversion][$profileid] : 'invalid');
}

public static function 
AACchannelCountCalculate($program_configs) {
$channels 0;
for (
$i 0$i $program_configs['num_front_channel_elements']; $i++) {
$channels++;
if (
$program_configs['front_element_is_cpe'][$i]) {

 
$channels++;
}
}
for (
$i 0$i $program_configs['num_side_channel_elements']; $i++) {
$channels++;
if (
$program_configs['side_element_is_cpe'][$i]) {

 
$channels++;
}
}
for (
$i 0$i $program_configs['num_back_channel_elements']; $i++) {
$channels++;
if (
$program_configs['back_element_is_cpe'][$i]) {

 
$channels++;
}
}
for (
$i 0$i $program_configs['num_lfe_channel_elements']; $i++) {
$channels++;
}
return 
$channels;
}

}

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