541 lines
25 KiB
PHP
541 lines
25 KiB
PHP
<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at http://getid3.sourceforge.net //
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// or http://www.getid3.org //
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/////////////////////////////////////////////////////////////////
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// See readme.txt for more details //
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/////////////////////////////////////////////////////////////////
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// //
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// module.audio.aac.php //
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// module for analyzing AAC Audio files //
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// dependencies: NONE //
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// ///
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/////////////////////////////////////////////////////////////////
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class getid3_aac
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{
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// new combined constructor
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function getid3_aac(&$fd, &$ThisFileInfo, $option) {
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if ($option === 'adif') {
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$this->getAACADIFheaderFilepointer($fd, $ThisFileInfo);
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} elseif ($option === 'adts') {
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$this->getAACADTSheaderFilepointer($fd, $ThisFileInfo);
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}
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return true;
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}
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function getAACADIFheaderFilepointer(&$fd, &$ThisFileInfo) {
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$ThisFileInfo['fileformat'] = 'aac';
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$ThisFileInfo['audio']['dataformat'] = 'aac';
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$ThisFileInfo['audio']['lossless'] = false;
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fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
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$AACheader = fread($fd, 1024);
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$offset = 0;
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if (substr($AACheader, 0, 4) == 'ADIF') {
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// http://faac.sourceforge.net/wiki/index.php?page=ADIF
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// http://libmpeg.org/mpeg4/doc/w2203tfs.pdf
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// adif_header() {
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// adif_id 32
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// copyright_id_present 1
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// if( copyright_id_present )
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// copyright_id 72
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// original_copy 1
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// home 1
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// bitstream_type 1
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// bitrate 23
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// num_program_config_elements 4
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// for (i = 0; i < num_program_config_elements + 1; i++ ) {
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// if( bitstream_type == '0' )
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// adif_buffer_fullness 20
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// program_config_element()
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// }
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// }
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$AACheaderBitstream = getid3_lib::BigEndian2Bin($AACheader);
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$bitoffset = 0;
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$ThisFileInfo['aac']['header_type'] = 'ADIF';
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$bitoffset += 32;
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$ThisFileInfo['aac']['header']['mpeg_version'] = 4;
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$ThisFileInfo['aac']['header']['copyright'] = (bool) (substr($AACheaderBitstream, $bitoffset, 1) == '1');
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$bitoffset += 1;
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if ($ThisFileInfo['aac']['header']['copyright']) {
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$ThisFileInfo['aac']['header']['copyright_id'] = getid3_lib::Bin2String(substr($AACheaderBitstream, $bitoffset, 72));
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$bitoffset += 72;
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}
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$ThisFileInfo['aac']['header']['original_copy'] = (bool) (substr($AACheaderBitstream, $bitoffset, 1) == '1');
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$bitoffset += 1;
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$ThisFileInfo['aac']['header']['home'] = (bool) (substr($AACheaderBitstream, $bitoffset, 1) == '1');
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$bitoffset += 1;
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$ThisFileInfo['aac']['header']['is_vbr'] = (bool) (substr($AACheaderBitstream, $bitoffset, 1) == '1');
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$bitoffset += 1;
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if ($ThisFileInfo['aac']['header']['is_vbr']) {
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$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
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$ThisFileInfo['aac']['header']['bitrate_max'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 23));
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$bitoffset += 23;
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} else {
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$ThisFileInfo['audio']['bitrate_mode'] = 'cbr';
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$ThisFileInfo['aac']['header']['bitrate'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 23));
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$bitoffset += 23;
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$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['aac']['header']['bitrate'];
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}
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if ($ThisFileInfo['audio']['bitrate'] == 0) {
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$ThisFileInfo['error'][] = 'Corrupt AAC file: bitrate_audio == zero';
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return false;
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}
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$ThisFileInfo['aac']['header']['num_program_configs'] = 1 + getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
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$bitoffset += 4;
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for ($i = 0; $i < $ThisFileInfo['aac']['header']['num_program_configs']; $i++) {
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// http://www.audiocoding.com/wiki/index.php?page=program_config_element
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// buffer_fullness 20
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// element_instance_tag 4
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// object_type 2
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// sampling_frequency_index 4
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// num_front_channel_elements 4
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// num_side_channel_elements 4
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// num_back_channel_elements 4
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// num_lfe_channel_elements 2
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// num_assoc_data_elements 3
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// num_valid_cc_elements 4
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// mono_mixdown_present 1
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// mono_mixdown_element_number 4 if mono_mixdown_present == 1
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// stereo_mixdown_present 1
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// stereo_mixdown_element_number 4 if stereo_mixdown_present == 1
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// matrix_mixdown_idx_present 1
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// matrix_mixdown_idx 2 if matrix_mixdown_idx_present == 1
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// pseudo_surround_enable 1 if matrix_mixdown_idx_present == 1
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// for (i = 0; i < num_front_channel_elements; i++) {
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// front_element_is_cpe[i] 1
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// front_element_tag_select[i] 4
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// }
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// for (i = 0; i < num_side_channel_elements; i++) {
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// side_element_is_cpe[i] 1
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// side_element_tag_select[i] 4
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// }
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// for (i = 0; i < num_back_channel_elements; i++) {
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// back_element_is_cpe[i] 1
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// back_element_tag_select[i] 4
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// }
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// for (i = 0; i < num_lfe_channel_elements; i++) {
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// lfe_element_tag_select[i] 4
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// }
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// for (i = 0; i < num_assoc_data_elements; i++) {
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// assoc_data_element_tag_select[i] 4
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// }
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// for (i = 0; i < num_valid_cc_elements; i++) {
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// cc_element_is_ind_sw[i] 1
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// valid_cc_element_tag_select[i] 4
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// }
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// byte_alignment() VAR
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// comment_field_bytes 8
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// for (i = 0; i < comment_field_bytes; i++) {
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// comment_field_data[i] 8
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// }
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if (!$ThisFileInfo['aac']['header']['is_vbr']) {
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$ThisFileInfo['aac']['program_configs'][$i]['buffer_fullness'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 20));
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$bitoffset += 20;
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}
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$ThisFileInfo['aac']['program_configs'][$i]['element_instance_tag'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
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$bitoffset += 4;
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$ThisFileInfo['aac']['program_configs'][$i]['object_type'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2));
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$bitoffset += 2;
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$ThisFileInfo['aac']['program_configs'][$i]['sampling_frequency_index'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
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$bitoffset += 4;
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$ThisFileInfo['aac']['program_configs'][$i]['num_front_channel_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
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$bitoffset += 4;
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$ThisFileInfo['aac']['program_configs'][$i]['num_side_channel_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
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$bitoffset += 4;
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$ThisFileInfo['aac']['program_configs'][$i]['num_back_channel_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
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$bitoffset += 4;
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$ThisFileInfo['aac']['program_configs'][$i]['num_lfe_channel_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2));
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$bitoffset += 2;
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$ThisFileInfo['aac']['program_configs'][$i]['num_assoc_data_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 3));
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$bitoffset += 3;
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$ThisFileInfo['aac']['program_configs'][$i]['num_valid_cc_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
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$bitoffset += 4;
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$ThisFileInfo['aac']['program_configs'][$i]['mono_mixdown_present'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
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$bitoffset += 1;
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if ($ThisFileInfo['aac']['program_configs'][$i]['mono_mixdown_present']) {
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$ThisFileInfo['aac']['program_configs'][$i]['mono_mixdown_element_number'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
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$bitoffset += 4;
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}
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$ThisFileInfo['aac']['program_configs'][$i]['stereo_mixdown_present'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
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$bitoffset += 1;
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if ($ThisFileInfo['aac']['program_configs'][$i]['stereo_mixdown_present']) {
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$ThisFileInfo['aac']['program_configs'][$i]['stereo_mixdown_element_number'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
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$bitoffset += 4;
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}
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$ThisFileInfo['aac']['program_configs'][$i]['matrix_mixdown_idx_present'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
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$bitoffset += 1;
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if ($ThisFileInfo['aac']['program_configs'][$i]['matrix_mixdown_idx_present']) {
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$ThisFileInfo['aac']['program_configs'][$i]['matrix_mixdown_idx'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2));
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$bitoffset += 2;
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$ThisFileInfo['aac']['program_configs'][$i]['pseudo_surround_enable'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
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$bitoffset += 1;
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}
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for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_front_channel_elements']; $j++) {
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$ThisFileInfo['aac']['program_configs'][$i]['front_element_is_cpe'][$j] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
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$bitoffset += 1;
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$ThisFileInfo['aac']['program_configs'][$i]['front_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
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$bitoffset += 4;
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}
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for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_side_channel_elements']; $j++) {
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$ThisFileInfo['aac']['program_configs'][$i]['side_element_is_cpe'][$j] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
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$bitoffset += 1;
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$ThisFileInfo['aac']['program_configs'][$i]['side_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
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$bitoffset += 4;
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}
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for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_back_channel_elements']; $j++) {
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$ThisFileInfo['aac']['program_configs'][$i]['back_element_is_cpe'][$j] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
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$bitoffset += 1;
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$ThisFileInfo['aac']['program_configs'][$i]['back_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
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$bitoffset += 4;
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}
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for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_lfe_channel_elements']; $j++) {
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$ThisFileInfo['aac']['program_configs'][$i]['lfe_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
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$bitoffset += 4;
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}
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for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_assoc_data_elements']; $j++) {
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$ThisFileInfo['aac']['program_configs'][$i]['assoc_data_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
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$bitoffset += 4;
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}
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for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_valid_cc_elements']; $j++) {
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$ThisFileInfo['aac']['program_configs'][$i]['cc_element_is_ind_sw'][$j] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
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$bitoffset += 1;
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$ThisFileInfo['aac']['program_configs'][$i]['valid_cc_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
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$bitoffset += 4;
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}
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$bitoffset = ceil($bitoffset / 8) * 8;
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$ThisFileInfo['aac']['program_configs'][$i]['comment_field_bytes'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 8));
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$bitoffset += 8;
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$ThisFileInfo['aac']['program_configs'][$i]['comment_field'] = getid3_lib::Bin2String(substr($AACheaderBitstream, $bitoffset, 8 * $ThisFileInfo['aac']['program_configs'][$i]['comment_field_bytes']));
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$bitoffset += 8 * $ThisFileInfo['aac']['program_configs'][$i]['comment_field_bytes'];
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||
|
||
|
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$ThisFileInfo['aac']['header']['profile_text'] = $this->AACprofileLookup($ThisFileInfo['aac']['program_configs'][$i]['object_type'], $ThisFileInfo['aac']['header']['mpeg_version']);
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$ThisFileInfo['aac']['program_configs'][$i]['sampling_frequency'] = $this->AACsampleRateLookup($ThisFileInfo['aac']['program_configs'][$i]['sampling_frequency_index']);
|
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$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['aac']['program_configs'][$i]['sampling_frequency'];
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$ThisFileInfo['audio']['channels'] = $this->AACchannelCountCalculate($ThisFileInfo['aac']['program_configs'][$i]);
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if ($ThisFileInfo['aac']['program_configs'][$i]['comment_field']) {
|
||
$ThisFileInfo['aac']['comments'][] = $ThisFileInfo['aac']['program_configs'][$i]['comment_field'];
|
||
}
|
||
}
|
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$ThisFileInfo['playtime_seconds'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['audio']['bitrate'];
|
||
|
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$ThisFileInfo['audio']['encoder_options'] = $ThisFileInfo['aac']['header_type'].' '.$ThisFileInfo['aac']['header']['profile_text'];
|
||
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||
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||
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return true;
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||
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||
} else {
|
||
|
||
unset($ThisFileInfo['fileformat']);
|
||
unset($ThisFileInfo['aac']);
|
||
$ThisFileInfo['error'][] = 'AAC-ADIF synch not found at offset '.$ThisFileInfo['avdataoffset'].' (expected "ADIF", found "'.substr($AACheader, 0, 4).'" instead)';
|
||
return false;
|
||
|
||
}
|
||
|
||
}
|
||
|
||
|
||
function getAACADTSheaderFilepointer(&$fd, &$ThisFileInfo, $MaxFramesToScan=1000000, $ReturnExtendedInfo=false) {
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// based loosely on code from AACfile by Jurgen Faul <jfaul<75>gmx.de>
|
||
// http://jfaul.de/atl or http://j-faul.virtualave.net/atl/atl.html
|
||
|
||
|
||
// 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
|
||
$BitrateCache = array();
|
||
|
||
|
||
while (true) {
|
||
// breaks out when end-of-file encountered, or invalid data found,
|
||
// or MaxFramesToScan frames have been scanned
|
||
|
||
if (!getid3_lib::intValueSupported($byteoffset)) {
|
||
$ThisFileInfo['warning'][] = 'Unable to parse AAC file beyond '.ftell($fd).' (PHP does not support file operations beyond '.round(PHP_INT_MAX / 1073741824).'GB)';
|
||
return false;
|
||
}
|
||
fseek($fd, $byteoffset, SEEK_SET);
|
||
|
||
// First get substring
|
||
$substring = fread($fd, 10);
|
||
$substringlength = strlen($substring);
|
||
if ($substringlength != 10) {
|
||
$ThisFileInfo['error'][] = 'Failed to read 10 bytes at offset '.(ftell($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) {
|
||
$ThisFileInfo['error'][] = 'Synch pattern (0x0FFF) not found at offset '.(ftell($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;
|
||
$ThisFileInfo['aac']['header']['layer'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2));
|
||
$bitoffset += 2;
|
||
if ($ThisFileInfo['aac']['header']['layer'] != 0) {
|
||
$ThisFileInfo['error'][] = 'Layer error - expected 0x00, found 0x'.dechex($ThisFileInfo['aac']['header']['layer']).' instead';
|
||
return false;
|
||
}
|
||
$ThisFileInfo['aac']['header']['crc_present'] = ((substr($AACheaderBitstream, $bitoffset, 1) == '0') ? true : false);
|
||
$bitoffset += 1;
|
||
$ThisFileInfo['aac']['header']['profile_id'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2));
|
||
$bitoffset += 2;
|
||
$ThisFileInfo['aac']['header']['profile_text'] = $this->AACprofileLookup($ThisFileInfo['aac']['header']['profile_id'], $ThisFileInfo['aac']['header']['mpeg_version']);
|
||
|
||
$ThisFileInfo['aac']['header']['sample_frequency_index'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4));
|
||
$bitoffset += 4;
|
||
$ThisFileInfo['aac']['header']['sample_frequency'] = $this->AACsampleRateLookup($ThisFileInfo['aac']['header']['sample_frequency_index']);
|
||
if ($ThisFileInfo['aac']['header']['sample_frequency'] == 0) {
|
||
$ThisFileInfo['error'][] = 'Corrupt AAC file: sample_frequency == zero';
|
||
return false;
|
||
}
|
||
$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['aac']['header']['sample_frequency'];
|
||
|
||
$ThisFileInfo['aac']['header']['private'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
||
$bitoffset += 1;
|
||
$ThisFileInfo['aac']['header']['channel_configuration'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 3));
|
||
$bitoffset += 3;
|
||
$ThisFileInfo['audio']['channels'] = $ThisFileInfo['aac']['header']['channel_configuration'];
|
||
$ThisFileInfo['aac']['header']['original'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
||
$bitoffset += 1;
|
||
$ThisFileInfo['aac']['header']['home'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
||
$bitoffset += 1;
|
||
|
||
if ($ThisFileInfo['aac']['header']['mpeg_version'] == 4) {
|
||
$ThisFileInfo['aac']['header']['emphasis'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2));
|
||
$bitoffset += 2;
|
||
}
|
||
|
||
if ($ReturnExtendedInfo) {
|
||
|
||
$ThisFileInfo['aac'][$framenumber]['copyright_id_bit'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1));
|
||
$bitoffset += 1;
|
||
$ThisFileInfo['aac'][$framenumber]['copyright_id_start'] = (bool) getid3_lib::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) * $FrameLength * 8;
|
||
}
|
||
getid3_lib::safe_inc($ThisFileInfo['aac']['bitrate_distribution'][$BitrateCache[$FrameLength]], 1);
|
||
|
||
$ThisFileInfo['aac'][$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'][] = 'Corrupt AAC file: playtime_seconds == zero';
|
||
return false;
|
||
}
|
||
$ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
|
||
ksort($ThisFileInfo['aac']['bitrate_distribution']);
|
||
|
||
$ThisFileInfo['audio']['encoder_options'] = $ThisFileInfo['aac']['header_type'].' '.$ThisFileInfo['aac']['header']['profile_text'];
|
||
|
||
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;
|
||
}
|
||
|
||
}
|
||
|
||
|
||
?>
|