Mercurial > judyates
view e2gallerypro/e2upload/Backend/Assets/getid3/module.audio.aac_adif.php @ 3:3f6b44aa6b35 judyates
[svn r4] added ability to buy stuff, from a Prints page, but it doesn't work well with the css, and it also has not been fitted into the perl make system.
| author | rlm |
|---|---|
| date | Mon, 22 Feb 2010 08:02:39 -0500 |
| parents | |
| children |
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1 <?php2 // +----------------------------------------------------------------------+3 // | PHP version 5 |4 // +----------------------------------------------------------------------+5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |6 // +----------------------------------------------------------------------+7 // | This source file is subject to version 2 of the GPL license, |8 // | that is bundled with this package in the file license.txt and is |9 // | available through the world-wide-web at the following url: |10 // | http://www.gnu.org/copyleft/gpl.html |11 // +----------------------------------------------------------------------+12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |13 // +----------------------------------------------------------------------+14 // | Authors: James Heinrich <infoØgetid3*org> |15 // | Allan Hansen <ahØartemis*dk> |16 // +----------------------------------------------------------------------+17 // | module.audio.aac_adif.php |18 // | Module for analyzing AAC files with ADIF header. |19 // | dependencies: NONE |20 // +----------------------------------------------------------------------+21 //22 // $Id: module.audio.aac_adif.php,v 1.3 2006/11/02 10:48:00 ah Exp $26 class getid3_aac_adif extends getid3_handler27 {29 public function Analyze() {31 $getid3 = $this->getid3;33 // http://faac.sourceforge.net/wiki/index.php?page=ADIF34 // http://libmpeg.org/mpeg4/doc/w2203tfs.pdf35 // adif_header() {36 // adif_id 3237 // copyright_id_present 138 // if( copyright_id_present )39 // copyright_id 7240 // original_copy 141 // home 142 // bitstream_type 143 // bitrate 2344 // num_program_config_elements 445 // for (i = 0; i < num_program_config_elements + 1; i++ ) {46 // if( bitstream_type == '0' )47 // adif_buffer_fullness 2048 // program_config_element()49 // }50 // }53 $getid3->info['fileformat'] = 'aac';54 $getid3->info['audio']['dataformat'] = 'aac';55 $getid3->info['audio']['lossless'] = false;57 $getid3->info['aac']['header'] = array () ;58 $info_aac = &$getid3->info['aac'];59 $info_aac_header = & $info_aac['header'];61 fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);62 $aac_header_bitstream = getid3_lib::BigEndian2Bin(fread($getid3->fp, 1024));64 $info_aac['header_type'] = 'ADIF';65 $info_aac_header['mpeg_version'] = 4;66 $bit_offset = 32;68 $info_aac_header['copyright'] = $aac_header_bitstream{$bit_offset++} == '1';69 if ($info_aac_header['copyright']) {70 $info_aac_header['copyright_id'] = getid3_aac_adif::Bin2String(substr($aac_header_bitstream, $bit_offset, 72));71 $bit_offset += 72;72 }74 $info_aac_header['original_copy'] = $aac_header_bitstream{$bit_offset++} == '1';75 $info_aac_header['home'] = $aac_header_bitstream{$bit_offset++} == '1';76 $info_aac_header['is_vbr'] = $aac_header_bitstream{$bit_offset++} == '1';78 if ($info_aac_header['is_vbr']) {79 $getid3->info['audio']['bitrate_mode'] = 'vbr';80 $info_aac_header['bitrate_max'] = bindec(substr($aac_header_bitstream, $bit_offset, 23));81 $bit_offset += 23;82 }83 else {84 $getid3->info['audio']['bitrate_mode'] = 'cbr';85 $info_aac_header['bitrate'] = bindec(substr($aac_header_bitstream, $bit_offset, 23));86 $bit_offset += 23;87 $getid3->info['audio']['bitrate'] = $info_aac_header['bitrate'];88 }90 $info_aac_header['num_program_configs'] = 1 + bindec(substr($aac_header_bitstream, $bit_offset, 4));91 $bit_offset += 4;93 for ($i = 0; $i < $info_aac_header['num_program_configs']; $i++) {95 // http://www.audiocoding.com/wiki/index.php?page=program_config_element97 // buffer_fullness 2099 // element_instance_tag 4100 // object_type 2101 // sampling_frequency_index 4102 // num_front_channel_elements 4103 // num_side_channel_elements 4104 // num_back_channel_elements 4105 // num_lfe_channel_elements 2106 // num_assoc_data_elements 3107 // num_valid_cc_elements 4108 // mono_mixdown_present 1109 // mono_mixdown_element_number 4 if mono_mixdown_present == 1110 // stereo_mixdown_present 1111 // stereo_mixdown_element_number 4 if stereo_mixdown_present == 1112 // matrix_mixdown_idx_present 1113 // matrix_mixdown_idx 2 if matrix_mixdown_idx_present == 1114 // pseudo_surround_enable 1 if matrix_mixdown_idx_present == 1115 // for (i = 0; i < num_front_channel_elements; i++) {116 // front_element_is_cpe[i] 1117 // front_element_tag_select[i] 4118 // }119 // for (i = 0; i < num_side_channel_elements; i++) {120 // side_element_is_cpe[i] 1121 // side_element_tag_select[i] 4122 // }123 // for (i = 0; i < num_back_channel_elements; i++) {124 // back_element_is_cpe[i] 1125 // back_element_tag_select[i] 4126 // }127 // for (i = 0; i < num_lfe_channel_elements; i++) {128 // lfe_element_tag_select[i] 4129 // }130 // for (i = 0; i < num_assoc_data_elements; i++) {131 // assoc_data_element_tag_select[i] 4132 // }133 // for (i = 0; i < num_valid_cc_elements; i++) {134 // cc_element_is_ind_sw[i] 1135 // valid_cc_element_tag_select[i] 4136 // }137 // byte_alignment() VAR138 // comment_field_bytes 8139 // for (i = 0; i < comment_field_bytes; i++) {140 // comment_field_data[i] 8141 // }143 $info_aac['program_configs'][$i] = array ();144 $info_aac_program_configs_i = &$info_aac['program_configs'][$i];146 if (!$info_aac_header['is_vbr']) {147 $info_aac_program_configs_i['buffer_fullness'] = bindec(substr($aac_header_bitstream, $bit_offset, 20));148 $bit_offset += 20;149 }151 $info_aac_program_configs_i['element_instance_tag'] = bindec(substr($aac_header_bitstream, $bit_offset, 4));152 $info_aac_program_configs_i['object_type'] = bindec(substr($aac_header_bitstream, $bit_offset + 4, 2));153 $info_aac_program_configs_i['sampling_frequency_index'] = bindec(substr($aac_header_bitstream, $bit_offset + 6, 4));154 $info_aac_program_configs_i['num_front_channel_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 10, 4));155 $info_aac_program_configs_i['num_side_channel_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 14, 4));156 $info_aac_program_configs_i['num_back_channel_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 18, 4));157 $info_aac_program_configs_i['num_lfe_channel_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 22, 2));158 $info_aac_program_configs_i['num_assoc_data_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 24, 3));159 $info_aac_program_configs_i['num_valid_cc_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 27, 4));160 $bit_offset += 31;162 $info_aac_program_configs_i['mono_mixdown_present'] = $aac_header_bitstream{$bit_offset++} == 1;163 if ($info_aac_program_configs_i['mono_mixdown_present']) {164 $info_aac_program_configs_i['mono_mixdown_element_number'] = bindec(substr($aac_header_bitstream, $bit_offset, 4));165 $bit_offset += 4;166 }168 $info_aac_program_configs_i['stereo_mixdown_present'] = $aac_header_bitstream{$bit_offset++} == 1;169 if ($info_aac_program_configs_i['stereo_mixdown_present']) {170 $info_aac_program_configs_i['stereo_mixdown_element_number'] = bindec(substr($aac_header_bitstream, $bit_offset, 4));171 $bit_offset += 4;172 }174 $info_aac_program_configs_i['matrix_mixdown_idx_present'] = $aac_header_bitstream{$bit_offset++} == 1;175 if ($info_aac_program_configs_i['matrix_mixdown_idx_present']) {176 $info_aac_program_configs_i['matrix_mixdown_idx'] = bindec(substr($aac_header_bitstream, $bit_offset, 2));177 $bit_offset += 2;178 $info_aac_program_configs_i['pseudo_surround_enable'] = $aac_header_bitstream{$bit_offset++} == 1;179 }181 for ($j = 0; $j < $info_aac_program_configs_i['num_front_channel_elements']; $j++) {182 $info_aac_program_configs_i['front_element_is_cpe'][$j] = $aac_header_bitstream{$bit_offset++} == 1;183 $info_aac_program_configs_i['front_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));184 $bit_offset += 4;185 }186 for ($j = 0; $j < $info_aac_program_configs_i['num_side_channel_elements']; $j++) {187 $info_aac_program_configs_i['side_element_is_cpe'][$j] = $aac_header_bitstream{$bit_offset++} == 1;188 $info_aac_program_configs_i['side_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));189 $bit_offset += 4;190 }191 for ($j = 0; $j < $info_aac_program_configs_i['num_back_channel_elements']; $j++) {192 $info_aac_program_configs_i['back_element_is_cpe'][$j] = $aac_header_bitstream{$bit_offset++} == 1;193 $info_aac_program_configs_i['back_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));194 $bit_offset += 4;195 }196 for ($j = 0; $j < $info_aac_program_configs_i['num_lfe_channel_elements']; $j++) {197 $info_aac_program_configs_i['lfe_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));198 $bit_offset += 4;199 }200 for ($j = 0; $j < $info_aac_program_configs_i['num_assoc_data_elements']; $j++) {201 $info_aac_program_configs_i['assoc_data_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));202 $bit_offset += 4;203 }204 for ($j = 0; $j < $info_aac_program_configs_i['num_valid_cc_elements']; $j++) {205 $info_aac_program_configs_i['cc_element_is_ind_sw'][$j] = $aac_header_bitstream{$bit_offset++} == 1;206 $info_aac_program_configs_i['valid_cc_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));207 $bit_offset += 4;208 }210 $bit_offset = ceil($bit_offset / 8) * 8;212 $info_aac_program_configs_i['comment_field_bytes'] = bindec(substr($aac_header_bitstream, $bit_offset, 8));213 $bit_offset += 8;215 $info_aac_program_configs_i['comment_field'] = getid3_aac_adif::Bin2String(substr($aac_header_bitstream, $bit_offset, 8 * $info_aac_program_configs_i['comment_field_bytes']));216 $bit_offset += 8 * $info_aac_program_configs_i['comment_field_bytes'];218 $info_aac_header['profile_text'] = getid3_aac_adif::AACprofileLookup($info_aac_program_configs_i['object_type'], $info_aac_header['mpeg_version']);219 $info_aac_program_configs_i['sampling_frequency'] = $getid3->info['audio']['sample_rate'] = getid3_aac_adif::AACsampleRateLookup($info_aac_program_configs_i['sampling_frequency_index']);220 $getid3->info['audio']['channels'] = getid3_aac_adif::AACchannelCountCalculate($info_aac_program_configs_i);222 if ($info_aac_program_configs_i['comment_field']) {223 $info_aac['comments'][] = $info_aac_program_configs_i['comment_field'];224 }225 }227 $getid3->info['playtime_seconds'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['audio']['bitrate'];228 $getid3->info['audio']['encoder_options'] = $info_aac['header_type'].' '.$info_aac_header['profile_text'];230 return true;231 }235 public static function Bin2String($bin_string) {236 // return 'hi' for input of '0110100001101001'237 $string = '';238 $bin_string_reversed = strrev($bin_string);239 for ($i = 0; $i < strlen($bin_string_reversed); $i += 8) {240 $string = chr(bindec(strrev(substr($bin_string_reversed, $i, 8)))).$string;241 }242 return $string;243 }247 public static function AACsampleRateLookup($samplerate_id) {249 static $lookup = array (250 0 => 96000,251 1 => 88200,252 2 => 64000,253 3 => 48000,254 4 => 44100,255 5 => 32000,256 6 => 24000,257 7 => 22050,258 8 => 16000,259 9 => 12000,260 10 => 11025,261 11 => 8000,262 12 => 0,263 13 => 0,264 14 => 0,265 15 => 0266 );267 return (isset($lookup[$samplerate_id]) ? $lookup[$samplerate_id] : 'invalid');268 }272 public static function AACprofileLookup($profile_id, $mpeg_version) {274 static $lookup = array (275 2 => array (276 0 => 'Main profile',277 1 => 'Low Complexity profile (LC)',278 2 => 'Scalable Sample Rate profile (SSR)',279 3 => '(reserved)'280 ),281 4 => array (282 0 => 'AAC_MAIN',283 1 => 'AAC_LC',284 2 => 'AAC_SSR',285 3 => 'AAC_LTP'286 )287 );288 return (isset($lookup[$mpeg_version][$profile_id]) ? $lookup[$mpeg_version][$profile_id] : 'invalid');289 }293 public static function AACchannelCountCalculate($program_configs) {295 $channels = 0;297 foreach (array ('front', 'side', 'back') as $placement) {298 for ($i = 0; $i < $program_configs['num_'.$placement.'_channel_elements']; $i++) {300 // Each element is channel pair (CPE = Channel Pair Element)301 $channels += 1 + ($program_configs[$placement.'_element_is_cpe'][$i] ? 1 : 0);302 }303 }305 return $channels + $program_configs['num_lfe_channel_elements'];306 }308 }311 ?>