507 lines
23 KiB
PHP
507 lines
23 KiB
PHP
<?php
|
|
/////////////////////////////////////////////////////////////////
|
|
/// getID3() by James Heinrich <getid3@users.sourceforge.net> //
|
|
// available at http://getid3.sourceforge.net ///
|
|
/////////////////////////////////////////////////////////////////
|
|
// //
|
|
// getid3.aac.php - part of getID3() //
|
|
// See getid3.readme.txt for more details //
|
|
// //
|
|
/////////////////////////////////////////////////////////////////
|
|
|
|
function getAACADIFheaderFilepointer(&$fd, &$ThisFileInfo) {
|
|
$ThisFileInfo['fileformat'] = 'aac';
|
|
$ThisFileInfo['audio']['dataformat'] = 'aac';
|
|
|
|
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
|
|
$AACheader = fread($fd, 1024);
|
|
$offset = 0;
|
|
|
|
if (substr($AACheader, 0, 4) == 'ADIF') {
|
|
|
|
// http://faac.sourceforge.net/wiki/index.php?page=ADIF
|
|
|
|
// http://libmpeg.org/mpeg4/doc/w2203tfs.pdf
|
|
// adif_header() {
|
|
// adif_id 32
|
|
// copyright_id_present 1
|
|
// if( copyright_id_present )
|
|
// copyright_id 72
|
|
// original_copy 1
|
|
// home 1
|
|
// bitstream_type 1
|
|
// bitrate 23
|
|
// num_program_config_elements 4
|
|
// for (i = 0; i < num_program_config_elements + 1; i++ ) {
|
|
// if( bitstream_type == '0' )
|
|
// adif_buffer_fullness 20
|
|
// program_config_element()
|
|
// }
|
|
// }
|
|
|
|
$AACheaderBitstream = BigEndian2Bin($AACheader);
|
|
$bitoffset = 0;
|
|
|
|
$ThisFileInfo['aac']['header_type'] = 'ADIF';
|
|
$bitoffset += 32;
|
|
$ThisFileInfo['aac']['header']['mpeg_version'] = 4;
|
|
|
|
$ThisFileInfo['aac']['header']['copyright'] = (bool) (substr($AACheaderBitstream, $bitoffset, 1) == '1');
|
|
$bitoffset += 1;
|
|
if ($ThisFileInfo['aac']['header']['copyright']) {
|
|
$ThisFileInfo['aac']['header']['copyright_id'] = Bin2String(substr($AACheaderBitstream, $bitoffset, 72));
|
|
$bitoffset += 72;
|
|
}
|
|
$ThisFileInfo['aac']['header']['original_copy'] = (bool) (substr($AACheaderBitstream, $bitoffset, 1) == '1');
|
|
$bitoffset += 1;
|
|
$ThisFileInfo['aac']['header']['home'] = (bool) (substr($AACheaderBitstream, $bitoffset, 1) == '1');
|
|
$bitoffset += 1;
|
|
$ThisFileInfo['aac']['header']['is_vbr'] = (bool) (substr($AACheaderBitstream, $bitoffset, 1) == '1');
|
|
$bitoffset += 1;
|
|
if ($ThisFileInfo['aac']['header']['is_vbr']) {
|
|
$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
|
|
$ThisFileInfo['aac']['header']['bitrate_max'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 23));
|
|
$bitoffset += 23;
|
|
} else {
|
|
$ThisFileInfo['audio']['bitrate_mode'] = 'cbr';
|
|
$ThisFileInfo['aac']['header']['bitrate'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 23));
|
|
$bitoffset += 23;
|
|
$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['aac']['header']['bitrate'];
|
|
}
|
|
if ($ThisFileInfo['audio']['bitrate'] == 0) {
|
|
$ThisFileInfo['error'] .= "\n".'Corrupt AAC file: bitrate_audio == zero';
|
|
return false;
|
|
}
|
|
$ThisFileInfo['aac']['header']['num_program_configs'] = 1 + Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
|
$bitoffset += 4;
|
|
|
|
for ($i = 0; $i < $ThisFileInfo['aac']['header']['num_program_configs']; $i++) {
|
|
// http://www.audiocoding.com/wiki/index.php?page=program_config_element
|
|
|
|
// buffer_fullness 20
|
|
|
|
// element_instance_tag 4
|
|
// object_type 2
|
|
// sampling_frequency_index 4
|
|
// num_front_channel_elements 4
|
|
// num_side_channel_elements 4
|
|
// num_back_channel_elements 4
|
|
// num_lfe_channel_elements 2
|
|
// num_assoc_data_elements 3
|
|
// num_valid_cc_elements 4
|
|
// mono_mixdown_present 1
|
|
// mono_mixdown_element_number 4 if mono_mixdown_present == 1
|
|
// stereo_mixdown_present 1
|
|
// stereo_mixdown_element_number 4 if stereo_mixdown_present == 1
|
|
// matrix_mixdown_idx_present 1
|
|
// matrix_mixdown_idx 2 if matrix_mixdown_idx_present == 1
|
|
// pseudo_surround_enable 1 if matrix_mixdown_idx_present == 1
|
|
// for (i = 0; i < num_front_channel_elements; i++) {
|
|
// front_element_is_cpe[i] 1
|
|
// front_element_tag_select[i] 4
|
|
// }
|
|
// for (i = 0; i < num_side_channel_elements; i++) {
|
|
// side_element_is_cpe[i] 1
|
|
// side_element_tag_select[i] 4
|
|
// }
|
|
// for (i = 0; i < num_back_channel_elements; i++) {
|
|
// back_element_is_cpe[i] 1
|
|
// back_element_tag_select[i] 4
|
|
// }
|
|
// for (i = 0; i < num_lfe_channel_elements; i++) {
|
|
// lfe_element_tag_select[i] 4
|
|
// }
|
|
// for (i = 0; i < num_assoc_data_elements; i++) {
|
|
// assoc_data_element_tag_select[i] 4
|
|
// }
|
|
// for (i = 0; i < num_valid_cc_elements; i++) {
|
|
// cc_element_is_ind_sw[i] 1
|
|
// valid_cc_element_tag_select[i] 4
|
|
// }
|
|
// byte_alignment() VAR
|
|
// comment_field_bytes 8
|
|
// for (i = 0; i < comment_field_bytes; i++) {
|
|
// comment_field_data[i] 8
|
|
// }
|
|
|
|
if (!$ThisFileInfo['aac']['header']['is_vbr']) {
|
|
$ThisFileInfo['aac']['program_configs'][$i]['buffer_fullness'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 20));
|
|
$bitoffset += 20;
|
|
}
|
|
$ThisFileInfo['aac']['program_configs'][$i]['element_instance_tag'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
|
$bitoffset += 4;
|
|
$ThisFileInfo['aac']['program_configs'][$i]['object_type'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2));
|
|
$bitoffset += 2;
|
|
$ThisFileInfo['aac']['program_configs'][$i]['sampling_frequency_index'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
|
$bitoffset += 4;
|
|
$ThisFileInfo['aac']['program_configs'][$i]['num_front_channel_elements'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
|
$bitoffset += 4;
|
|
$ThisFileInfo['aac']['program_configs'][$i]['num_side_channel_elements'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
|
$bitoffset += 4;
|
|
$ThisFileInfo['aac']['program_configs'][$i]['num_back_channel_elements'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
|
$bitoffset += 4;
|
|
$ThisFileInfo['aac']['program_configs'][$i]['num_lfe_channel_elements'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2));
|
|
$bitoffset += 2;
|
|
$ThisFileInfo['aac']['program_configs'][$i]['num_assoc_data_elements'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 3));
|
|
$bitoffset += 3;
|
|
$ThisFileInfo['aac']['program_configs'][$i]['num_valid_cc_elements'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
|
$bitoffset += 4;
|
|
$ThisFileInfo['aac']['program_configs'][$i]['mono_mixdown_present'] = (bool) Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
|
$bitoffset += 1;
|
|
if ($ThisFileInfo['aac']['program_configs'][$i]['mono_mixdown_present']) {
|
|
$ThisFileInfo['aac']['program_configs'][$i]['mono_mixdown_element_number'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
|
$bitoffset += 4;
|
|
}
|
|
$ThisFileInfo['aac']['program_configs'][$i]['stereo_mixdown_present'] = (bool) Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
|
$bitoffset += 1;
|
|
if ($ThisFileInfo['aac']['program_configs'][$i]['stereo_mixdown_present']) {
|
|
$ThisFileInfo['aac']['program_configs'][$i]['stereo_mixdown_element_number'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
|
$bitoffset += 4;
|
|
}
|
|
$ThisFileInfo['aac']['program_configs'][$i]['matrix_mixdown_idx_present'] = (bool) Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
|
$bitoffset += 1;
|
|
if ($ThisFileInfo['aac']['program_configs'][$i]['matrix_mixdown_idx_present']) {
|
|
$ThisFileInfo['aac']['program_configs'][$i]['matrix_mixdown_idx'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2));
|
|
$bitoffset += 2;
|
|
$ThisFileInfo['aac']['program_configs'][$i]['pseudo_surround_enable'] = (bool) Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
|
$bitoffset += 1;
|
|
}
|
|
for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_front_channel_elements']; $j++) {
|
|
$ThisFileInfo['aac']['program_configs'][$i]['front_element_is_cpe'][$j] = (bool) Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
|
$bitoffset += 1;
|
|
$ThisFileInfo['aac']['program_configs'][$i]['front_element_tag_select'][$j] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
|
$bitoffset += 4;
|
|
}
|
|
for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_side_channel_elements']; $j++) {
|
|
$ThisFileInfo['aac']['program_configs'][$i]['side_element_is_cpe'][$j] = (bool) Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
|
$bitoffset += 1;
|
|
$ThisFileInfo['aac']['program_configs'][$i]['side_element_tag_select'][$j] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
|
$bitoffset += 4;
|
|
}
|
|
for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_back_channel_elements']; $j++) {
|
|
$ThisFileInfo['aac']['program_configs'][$i]['back_element_is_cpe'][$j] = (bool) Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
|
$bitoffset += 1;
|
|
$ThisFileInfo['aac']['program_configs'][$i]['back_element_tag_select'][$j] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
|
$bitoffset += 4;
|
|
}
|
|
for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_lfe_channel_elements']; $j++) {
|
|
$ThisFileInfo['aac']['program_configs'][$i]['lfe_element_tag_select'][$j] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
|
$bitoffset += 4;
|
|
}
|
|
for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_assoc_data_elements']; $j++) {
|
|
$ThisFileInfo['aac']['program_configs'][$i]['assoc_data_element_tag_select'][$j] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
|
$bitoffset += 4;
|
|
}
|
|
for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_valid_cc_elements']; $j++) {
|
|
$ThisFileInfo['aac']['program_configs'][$i]['cc_element_is_ind_sw'][$j] = (bool) Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
|
$bitoffset += 1;
|
|
$ThisFileInfo['aac']['program_configs'][$i]['valid_cc_element_tag_select'][$j] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
|
$bitoffset += 4;
|
|
}
|
|
|
|
$bitoffset = ceil($bitoffset / 8) * 8;
|
|
|
|
$ThisFileInfo['aac']['program_configs'][$i]['comment_field_bytes'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 8));
|
|
$bitoffset += 8;
|
|
$ThisFileInfo['aac']['program_configs'][$i]['comment_field'] = Bin2String(substr($AACheaderBitstream, $bitoffset, 8 * $ThisFileInfo['aac']['program_configs'][$i]['comment_field_bytes']));
|
|
$bitoffset += 8 * $ThisFileInfo['aac']['program_configs'][$i]['comment_field_bytes'];
|
|
|
|
|
|
$ThisFileInfo['aac']['header']['profile_text'] = AACprofileLookup($ThisFileInfo['aac']['program_configs'][$i]['object_type'], $ThisFileInfo['aac']['header']['mpeg_version']);
|
|
$ThisFileInfo['aac']['program_configs'][$i]['sampling_frequency'] = AACsampleRateLookup($ThisFileInfo['aac']['program_configs'][$i]['sampling_frequency_index']);
|
|
$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['aac']['program_configs'][$i]['sampling_frequency'];
|
|
$ThisFileInfo['audio']['channels'] = AACchannelCountCalculate($ThisFileInfo['aac']['program_configs'][$i]);
|
|
if ($ThisFileInfo['aac']['program_configs'][$i]['comment_field']) {
|
|
$ThisFileInfo['comments']['comment'][] = $ThisFileInfo['aac']['program_configs'][$i]['comment_field'];
|
|
}
|
|
}
|
|
$ThisFileInfo['playtime_seconds'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['audio']['bitrate'];
|
|
|
|
return true;
|
|
|
|
} else {
|
|
|
|
unset($ThisFileInfo['fileformat']);
|
|
unset($ThisFileInfo['aac']);
|
|
$ThisFileInfo['error'] .= "\n".'AAC-ADIF synch not found (expected "ADIF", found "'.substr($AACheader, 0, 4).'" instead)';
|
|
return false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
function getAACADTSheaderFilepointer(&$fd, &$ThisFileInfo, $MaxFramesToScan=1000000, $ReturnExtendedInfo=false) {
|
|
// based loosely on code from AACfile by Jurgen Faul
|
|
// jfaul@gmx.de http://jfaul.de/atl
|
|
|
|
|
|
// http://faac.sourceforge.net/wiki/index.php?page=ADTS
|
|
|
|
// * ADTS Fixed Header: these don't change from frame to frame
|
|
// syncword 12 always: '111111111111'
|
|
// ID 1 0: MPEG-4, 1: MPEG-2
|
|
// layer 2 always: '00'
|
|
// protection_absent 1
|
|
// profile 2
|
|
// sampling_frequency_index 4
|
|
// private_bit 1
|
|
// channel_configuration 3
|
|
// original/copy 1
|
|
// home 1
|
|
// emphasis 2 only if ID == 0 (ie MPEG-4)
|
|
|
|
// * ADTS Variable Header: these can change from frame to frame
|
|
// copyright_identification_bit 1
|
|
// copyright_identification_start 1
|
|
// aac_frame_length 13 length of the frame including header (in bytes)
|
|
// adts_buffer_fullness 11 0x7FF indicates VBR
|
|
// no_raw_data_blocks_in_frame 2
|
|
|
|
// * ADTS Error check
|
|
// crc_check 16 only if protection_absent == 0
|
|
|
|
$byteoffset = 0;
|
|
$framenumber = 0;
|
|
|
|
// Init bit pattern array
|
|
static $decbin = array();
|
|
|
|
// Populate $bindec
|
|
for ($i = 0; $i < 256; $i++) {
|
|
$decbin[chr($i)] = str_pad(decbin($i), 8, '0', STR_PAD_LEFT);
|
|
}
|
|
|
|
// used to calculate bitrate below
|
|
static $BitrateCache = array();
|
|
|
|
|
|
while (true) {
|
|
// breaks out when end-of-file encountered, or invalid data found,
|
|
// or MaxFramesToScan frames have been scanned
|
|
|
|
fseek($fd, $byteoffset, SEEK_SET);
|
|
|
|
// First get substring
|
|
$substring = fread($fd, 10);
|
|
$substringlength = strlen($substring);
|
|
if ($substringlength != 10) {
|
|
$ThisFileInfo['error'] .= "\n".'Failed to read 10 bytes at offset '.(ftell($fd) - $substringlength).' (only read '.$substringlength.' bytes)';
|
|
return false;
|
|
}
|
|
|
|
// Initialise $AACheaderBitstream
|
|
$AACheaderBitstream = '';
|
|
|
|
// Loop thru substring chars
|
|
for ($i = 0; $i < 10; $i++) {
|
|
$AACheaderBitstream .= $decbin[$substring{$i}];
|
|
}
|
|
|
|
$bitoffset = 0;
|
|
|
|
$synctest = bindec(substr($AACheaderBitstream, $bitoffset, 12));
|
|
|
|
$bitoffset += 12;
|
|
if ($synctest != 0x0FFF) {
|
|
$ThisFileInfo['error'] .= "\n".'Synch pattern (0x0FFF) not found at offset '.(ftell($fd) - 10).' (found 0x0'.strtoupper(dechex($synctest)).' instead)';
|
|
if ($ThisFileInfo['fileformat'] == 'aac') {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// Gather info for first frame only - this takes time to do 1000 times!
|
|
if ($framenumber > 0) {
|
|
|
|
if (!$AACheaderBitstream[$bitoffset]) {
|
|
|
|
// MPEG-4
|
|
$bitoffset += 20;
|
|
|
|
} else {
|
|
|
|
// MPEG-2
|
|
$bitoffset += 18;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
$ThisFileInfo['aac']['header_type'] = 'ADTS';
|
|
$ThisFileInfo['aac']['header']['synch'] = $synctest;
|
|
$ThisFileInfo['fileformat'] = 'aac';
|
|
$ThisFileInfo['audio']['dataformat'] = 'aac';
|
|
|
|
$ThisFileInfo['aac']['header']['mpeg_version'] = ((substr($AACheaderBitstream, $bitoffset, 1) == '0') ? 4 : 2);
|
|
$bitoffset += 1;
|
|
$ThisFileInfo['aac']['header']['layer'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2));
|
|
$bitoffset += 2;
|
|
if ($ThisFileInfo['aac']['header']['layer'] != 0) {
|
|
$ThisFileInfo['error'] .= "\n".'Layer error - expected 0x00, found 0x'.dechex($ThisFileInfo['aac']['header']['layer']).' instead';
|
|
return false;
|
|
}
|
|
$ThisFileInfo['aac']['header']['crc_present'] = ((substr($AACheaderBitstream, $bitoffset, 1) == '0') ? true : false);
|
|
$bitoffset += 1;
|
|
$ThisFileInfo['aac']['header']['profile_id'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2));
|
|
$bitoffset += 2;
|
|
$ThisFileInfo['aac']['header']['profile_text'] = AACprofileLookup($ThisFileInfo['aac']['header']['profile_id'], $ThisFileInfo['aac']['header']['mpeg_version']);
|
|
|
|
$ThisFileInfo['aac']['header']['sample_frequency_index'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
|
$bitoffset += 4;
|
|
$ThisFileInfo['aac']['header']['sample_frequency'] = AACsampleRateLookup($ThisFileInfo['aac']['header']['sample_frequency_index']);
|
|
if ($ThisFileInfo['aac']['header']['sample_frequency'] == 0) {
|
|
$ThisFileInfo['error'] .= "\n".'Corrupt AAC file: sample_frequency == zero';
|
|
return false;
|
|
}
|
|
$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['aac']['header']['sample_frequency'];
|
|
|
|
$ThisFileInfo['aac']['header']['private'] = (bool) Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
|
$bitoffset += 1;
|
|
$ThisFileInfo['aac']['header']['channel_configuration'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 3));
|
|
$bitoffset += 3;
|
|
$ThisFileInfo['audio']['channels'] = $ThisFileInfo['aac']['header']['channel_configuration'];
|
|
$ThisFileInfo['aac']['header']['original'] = (bool) Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
|
$bitoffset += 1;
|
|
$ThisFileInfo['aac']['header']['home'] = (bool) Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
|
$bitoffset += 1;
|
|
|
|
if ($ThisFileInfo['aac']['header']['mpeg_version'] == 4) {
|
|
$ThisFileInfo['aac']['header']['emphasis'] = Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2));
|
|
$bitoffset += 2;
|
|
}
|
|
|
|
if ($ReturnExtendedInfo) {
|
|
|
|
$ThisFileInfo['aac'][$framenumber]['copyright_id_bit'] = (bool) Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
|
$bitoffset += 1;
|
|
$ThisFileInfo['aac'][$framenumber]['copyright_id_start'] = (bool) Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
|
$bitoffset += 1;
|
|
|
|
} else {
|
|
|
|
$bitoffset += 2;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
$FrameLength = bindec(substr($AACheaderBitstream, $bitoffset, 13));
|
|
|
|
if (!isset($BitrateCache[$FrameLength])) {
|
|
$BitrateCache[$FrameLength] = ($ThisFileInfo['aac']['header']['sample_frequency'] / 1024) * $FrameLength * 8;
|
|
}
|
|
safe_inc($ThisFileInfo['aac']['bitrate_distribution'][$BitrateCache[$FrameLength]]);
|
|
|
|
$ThisFileInfo['aac'][$framenumber]['aac_frame_length'] = $FrameLength;
|
|
$bitoffset += 13;
|
|
$ThisFileInfo['aac'][$framenumber]['adts_buffer_fullness'] = bindec(substr($AACheaderBitstream, $bitoffset, 11));
|
|
$bitoffset += 11;
|
|
if ($ThisFileInfo['aac'][$framenumber]['adts_buffer_fullness'] == 0x07FF) {
|
|
$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
|
|
} else {
|
|
$ThisFileInfo['audio']['bitrate_mode'] = 'cbr';
|
|
}
|
|
$ThisFileInfo['aac'][$framenumber]['num_raw_data_blocks'] = bindec(substr($AACheaderBitstream, $bitoffset, 2));
|
|
$bitoffset += 2;
|
|
|
|
if ($ThisFileInfo['aac']['header']['crc_present']) {
|
|
//$ThisFileInfo['aac'][$framenumber]['crc'] = bindec(substr($AACheaderBitstream, $bitoffset, 16));
|
|
$bitoffset += 16;
|
|
}
|
|
|
|
if (!$ReturnExtendedInfo) {
|
|
unset($ThisFileInfo['aac'][$framenumber]);
|
|
}
|
|
|
|
$byteoffset += $FrameLength;
|
|
if ((++$framenumber < $MaxFramesToScan) && (($byteoffset + 10) < $ThisFileInfo['avdataend'])) {
|
|
|
|
// keep scanning
|
|
|
|
} else {
|
|
|
|
$ThisFileInfo['aac']['frames'] = $framenumber;
|
|
$ThisFileInfo['playtime_seconds'] = ($ThisFileInfo['avdataend'] / $byteoffset) * (($framenumber * 1024) / $ThisFileInfo['aac']['header']['sample_frequency']); // (1 / % of file scanned) * (samples / (samples/sec)) = seconds
|
|
if ($ThisFileInfo['playtime_seconds'] == 0) {
|
|
$ThisFileInfo['error'] .= "\n".'Corrupt AAC file: playtime_seconds == zero';
|
|
return false;
|
|
}
|
|
$ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
|
|
ksort($ThisFileInfo['aac']['bitrate_distribution']);
|
|
|
|
return true;
|
|
|
|
}
|
|
}
|
|
// should never get here.
|
|
}
|
|
|
|
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');
|
|
}
|
|
|
|
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][$profileid] : 'invalid');
|
|
}
|
|
|
|
function AACchannelCountCalculate($program_configs) {
|
|
$channels = 0;
|
|
for ($i = 0; $i < $program_configs['num_front_channel_elements']; $i++) {
|
|
$channels++;
|
|
if ($program_configs['front_element_is_cpe'][$i]) {
|
|
// each front element is channel pair (CPE = Channel Pair Element)
|
|
$channels++;
|
|
}
|
|
}
|
|
for ($i = 0; $i < $program_configs['num_side_channel_elements']; $i++) {
|
|
$channels++;
|
|
if ($program_configs['side_element_is_cpe'][$i]) {
|
|
// each side element is channel pair (CPE = Channel Pair Element)
|
|
$channels++;
|
|
}
|
|
}
|
|
for ($i = 0; $i < $program_configs['num_back_channel_elements']; $i++) {
|
|
$channels++;
|
|
if ($program_configs['back_element_is_cpe'][$i]) {
|
|
// each back element is channel pair (CPE = Channel Pair Element)
|
|
$channels++;
|
|
}
|
|
}
|
|
for ($i = 0; $i < $program_configs['num_lfe_channel_elements']; $i++) {
|
|
$channels++;
|
|
}
|
|
return $channels;
|
|
}
|
|
|
|
?>
|