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1 <?php
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2 // +----------------------------------------------------------------------+
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3 // | PHP version 5 |
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4 // +----------------------------------------------------------------------+
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5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
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6 // +----------------------------------------------------------------------+
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7 // | This source file is subject to version 2 of the GPL license, |
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8 // | that is bundled with this package in the file license.txt and is |
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9 // | available through the world-wide-web at the following url: |
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10 // | http://www.gnu.org/copyleft/gpl.html |
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11 // +----------------------------------------------------------------------+
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12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
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13 // +----------------------------------------------------------------------+
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14 // | Authors: James Heinrich <infoØgetid3*org> |
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15 // | Allan Hansen <ahØartemis*dk> |
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16 // +----------------------------------------------------------------------+
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17 // | module.audio.aac_adif.php |
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18 // | Module for analyzing AAC files with ADIF header. |
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19 // | dependencies: NONE |
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20 // +----------------------------------------------------------------------+
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21 //
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22 // $Id: module.audio.aac_adif.php,v 1.3 2006/11/02 10:48:00 ah Exp $
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23
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24
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25
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26 class getid3_aac_adif extends getid3_handler
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27 {
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28
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29 public function Analyze() {
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30
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31 $getid3 = $this->getid3;
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32
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33 // http://faac.sourceforge.net/wiki/index.php?page=ADIF
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34 // http://libmpeg.org/mpeg4/doc/w2203tfs.pdf
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35 // adif_header() {
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36 // adif_id 32
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37 // copyright_id_present 1
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38 // if( copyright_id_present )
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39 // copyright_id 72
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40 // original_copy 1
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41 // home 1
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42 // bitstream_type 1
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43 // bitrate 23
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44 // num_program_config_elements 4
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45 // for (i = 0; i < num_program_config_elements + 1; i++ ) {
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46 // if( bitstream_type == '0' )
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47 // adif_buffer_fullness 20
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48 // program_config_element()
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49 // }
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50 // }
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51
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52
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53 $getid3->info['fileformat'] = 'aac';
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54 $getid3->info['audio']['dataformat'] = 'aac';
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55 $getid3->info['audio']['lossless'] = false;
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56
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57 $getid3->info['aac']['header'] = array () ;
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58 $info_aac = &$getid3->info['aac'];
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59 $info_aac_header = & $info_aac['header'];
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60
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61 fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
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62 $aac_header_bitstream = getid3_lib::BigEndian2Bin(fread($getid3->fp, 1024));
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63
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64 $info_aac['header_type'] = 'ADIF';
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65 $info_aac_header['mpeg_version'] = 4;
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66 $bit_offset = 32;
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67
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68 $info_aac_header['copyright'] = $aac_header_bitstream{$bit_offset++} == '1';
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69 if ($info_aac_header['copyright']) {
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70 $info_aac_header['copyright_id'] = getid3_aac_adif::Bin2String(substr($aac_header_bitstream, $bit_offset, 72));
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71 $bit_offset += 72;
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72 }
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73
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74 $info_aac_header['original_copy'] = $aac_header_bitstream{$bit_offset++} == '1';
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75 $info_aac_header['home'] = $aac_header_bitstream{$bit_offset++} == '1';
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76 $info_aac_header['is_vbr'] = $aac_header_bitstream{$bit_offset++} == '1';
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77
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78 if ($info_aac_header['is_vbr']) {
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79 $getid3->info['audio']['bitrate_mode'] = 'vbr';
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80 $info_aac_header['bitrate_max'] = bindec(substr($aac_header_bitstream, $bit_offset, 23));
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81 $bit_offset += 23;
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82 }
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83 else {
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84 $getid3->info['audio']['bitrate_mode'] = 'cbr';
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85 $info_aac_header['bitrate'] = bindec(substr($aac_header_bitstream, $bit_offset, 23));
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86 $bit_offset += 23;
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87 $getid3->info['audio']['bitrate'] = $info_aac_header['bitrate'];
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88 }
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89
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90 $info_aac_header['num_program_configs'] = 1 + bindec(substr($aac_header_bitstream, $bit_offset, 4));
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91 $bit_offset += 4;
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92
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93 for ($i = 0; $i < $info_aac_header['num_program_configs']; $i++) {
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94
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95 // http://www.audiocoding.com/wiki/index.php?page=program_config_element
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96
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97 // buffer_fullness 20
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98
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99 // element_instance_tag 4
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100 // object_type 2
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101 // sampling_frequency_index 4
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102 // num_front_channel_elements 4
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103 // num_side_channel_elements 4
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104 // num_back_channel_elements 4
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105 // num_lfe_channel_elements 2
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106 // num_assoc_data_elements 3
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107 // num_valid_cc_elements 4
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108 // mono_mixdown_present 1
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109 // mono_mixdown_element_number 4 if mono_mixdown_present == 1
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110 // stereo_mixdown_present 1
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111 // stereo_mixdown_element_number 4 if stereo_mixdown_present == 1
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112 // matrix_mixdown_idx_present 1
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113 // matrix_mixdown_idx 2 if matrix_mixdown_idx_present == 1
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114 // pseudo_surround_enable 1 if matrix_mixdown_idx_present == 1
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115 // for (i = 0; i < num_front_channel_elements; i++) {
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116 // front_element_is_cpe[i] 1
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117 // front_element_tag_select[i] 4
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118 // }
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119 // for (i = 0; i < num_side_channel_elements; i++) {
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120 // side_element_is_cpe[i] 1
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121 // side_element_tag_select[i] 4
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122 // }
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123 // for (i = 0; i < num_back_channel_elements; i++) {
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124 // back_element_is_cpe[i] 1
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125 // back_element_tag_select[i] 4
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126 // }
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127 // for (i = 0; i < num_lfe_channel_elements; i++) {
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128 // lfe_element_tag_select[i] 4
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129 // }
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130 // for (i = 0; i < num_assoc_data_elements; i++) {
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131 // assoc_data_element_tag_select[i] 4
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132 // }
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133 // for (i = 0; i < num_valid_cc_elements; i++) {
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134 // cc_element_is_ind_sw[i] 1
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135 // valid_cc_element_tag_select[i] 4
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136 // }
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137 // byte_alignment() VAR
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138 // comment_field_bytes 8
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139 // for (i = 0; i < comment_field_bytes; i++) {
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140 // comment_field_data[i] 8
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141 // }
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142
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143 $info_aac['program_configs'][$i] = array ();
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144 $info_aac_program_configs_i = &$info_aac['program_configs'][$i];
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145
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146 if (!$info_aac_header['is_vbr']) {
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147 $info_aac_program_configs_i['buffer_fullness'] = bindec(substr($aac_header_bitstream, $bit_offset, 20));
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148 $bit_offset += 20;
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149 }
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150
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151 $info_aac_program_configs_i['element_instance_tag'] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
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152 $info_aac_program_configs_i['object_type'] = bindec(substr($aac_header_bitstream, $bit_offset + 4, 2));
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153 $info_aac_program_configs_i['sampling_frequency_index'] = bindec(substr($aac_header_bitstream, $bit_offset + 6, 4));
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154 $info_aac_program_configs_i['num_front_channel_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 10, 4));
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155 $info_aac_program_configs_i['num_side_channel_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 14, 4));
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156 $info_aac_program_configs_i['num_back_channel_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 18, 4));
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157 $info_aac_program_configs_i['num_lfe_channel_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 22, 2));
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158 $info_aac_program_configs_i['num_assoc_data_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 24, 3));
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159 $info_aac_program_configs_i['num_valid_cc_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 27, 4));
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160 $bit_offset += 31;
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161
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162 $info_aac_program_configs_i['mono_mixdown_present'] = $aac_header_bitstream{$bit_offset++} == 1;
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163 if ($info_aac_program_configs_i['mono_mixdown_present']) {
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164 $info_aac_program_configs_i['mono_mixdown_element_number'] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
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165 $bit_offset += 4;
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166 }
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167
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168 $info_aac_program_configs_i['stereo_mixdown_present'] = $aac_header_bitstream{$bit_offset++} == 1;
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169 if ($info_aac_program_configs_i['stereo_mixdown_present']) {
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170 $info_aac_program_configs_i['stereo_mixdown_element_number'] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
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171 $bit_offset += 4;
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172 }
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173
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174 $info_aac_program_configs_i['matrix_mixdown_idx_present'] = $aac_header_bitstream{$bit_offset++} == 1;
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175 if ($info_aac_program_configs_i['matrix_mixdown_idx_present']) {
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176 $info_aac_program_configs_i['matrix_mixdown_idx'] = bindec(substr($aac_header_bitstream, $bit_offset, 2));
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177 $bit_offset += 2;
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178 $info_aac_program_configs_i['pseudo_surround_enable'] = $aac_header_bitstream{$bit_offset++} == 1;
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179 }
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180
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181 for ($j = 0; $j < $info_aac_program_configs_i['num_front_channel_elements']; $j++) {
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182 $info_aac_program_configs_i['front_element_is_cpe'][$j] = $aac_header_bitstream{$bit_offset++} == 1;
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183 $info_aac_program_configs_i['front_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
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184 $bit_offset += 4;
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185 }
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186 for ($j = 0; $j < $info_aac_program_configs_i['num_side_channel_elements']; $j++) {
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187 $info_aac_program_configs_i['side_element_is_cpe'][$j] = $aac_header_bitstream{$bit_offset++} == 1;
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188 $info_aac_program_configs_i['side_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
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189 $bit_offset += 4;
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190 }
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191 for ($j = 0; $j < $info_aac_program_configs_i['num_back_channel_elements']; $j++) {
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192 $info_aac_program_configs_i['back_element_is_cpe'][$j] = $aac_header_bitstream{$bit_offset++} == 1;
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193 $info_aac_program_configs_i['back_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
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194 $bit_offset += 4;
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195 }
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196 for ($j = 0; $j < $info_aac_program_configs_i['num_lfe_channel_elements']; $j++) {
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197 $info_aac_program_configs_i['lfe_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
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198 $bit_offset += 4;
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199 }
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200 for ($j = 0; $j < $info_aac_program_configs_i['num_assoc_data_elements']; $j++) {
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201 $info_aac_program_configs_i['assoc_data_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
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202 $bit_offset += 4;
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203 }
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204 for ($j = 0; $j < $info_aac_program_configs_i['num_valid_cc_elements']; $j++) {
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205 $info_aac_program_configs_i['cc_element_is_ind_sw'][$j] = $aac_header_bitstream{$bit_offset++} == 1;
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206 $info_aac_program_configs_i['valid_cc_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4));
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207 $bit_offset += 4;
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208 }
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209
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210 $bit_offset = ceil($bit_offset / 8) * 8;
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211
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212 $info_aac_program_configs_i['comment_field_bytes'] = bindec(substr($aac_header_bitstream, $bit_offset, 8));
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213 $bit_offset += 8;
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214
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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']));
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216 $bit_offset += 8 * $info_aac_program_configs_i['comment_field_bytes'];
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217
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218 $info_aac_header['profile_text'] = getid3_aac_adif::AACprofileLookup($info_aac_program_configs_i['object_type'], $info_aac_header['mpeg_version']);
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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']);
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220 $getid3->info['audio']['channels'] = getid3_aac_adif::AACchannelCountCalculate($info_aac_program_configs_i);
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221
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222 if ($info_aac_program_configs_i['comment_field']) {
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223 $info_aac['comments'][] = $info_aac_program_configs_i['comment_field'];
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224 }
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225 }
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226
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227 $getid3->info['playtime_seconds'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['audio']['bitrate'];
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228 $getid3->info['audio']['encoder_options'] = $info_aac['header_type'].' '.$info_aac_header['profile_text'];
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229
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230 return true;
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231 }
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232
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233
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234
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235 public static function Bin2String($bin_string) {
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236 // return 'hi' for input of '0110100001101001'
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237 $string = '';
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238 $bin_string_reversed = strrev($bin_string);
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239 for ($i = 0; $i < strlen($bin_string_reversed); $i += 8) {
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240 $string = chr(bindec(strrev(substr($bin_string_reversed, $i, 8)))).$string;
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241 }
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242 return $string;
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243 }
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244
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245
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246
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247 public static function AACsampleRateLookup($samplerate_id) {
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248
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rlm@3
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249 static $lookup = array (
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rlm@3
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250 0 => 96000,
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rlm@3
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251 1 => 88200,
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rlm@3
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252 2 => 64000,
|
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rlm@3
|
253 3 => 48000,
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rlm@3
|
254 4 => 44100,
|
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rlm@3
|
255 5 => 32000,
|
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rlm@3
|
256 6 => 24000,
|
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rlm@3
|
257 7 => 22050,
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rlm@3
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258 8 => 16000,
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rlm@3
|
259 9 => 12000,
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rlm@3
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260 10 => 11025,
|
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rlm@3
|
261 11 => 8000,
|
|
rlm@3
|
262 12 => 0,
|
|
rlm@3
|
263 13 => 0,
|
|
rlm@3
|
264 14 => 0,
|
|
rlm@3
|
265 15 => 0
|
|
rlm@3
|
266 );
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rlm@3
|
267 return (isset($lookup[$samplerate_id]) ? $lookup[$samplerate_id] : 'invalid');
|
|
rlm@3
|
268 }
|
|
rlm@3
|
269
|
|
rlm@3
|
270
|
|
rlm@3
|
271
|
|
rlm@3
|
272 public static function AACprofileLookup($profile_id, $mpeg_version) {
|
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rlm@3
|
273
|
|
rlm@3
|
274 static $lookup = array (
|
|
rlm@3
|
275 2 => array (
|
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rlm@3
|
276 0 => 'Main profile',
|
|
rlm@3
|
277 1 => 'Low Complexity profile (LC)',
|
|
rlm@3
|
278 2 => 'Scalable Sample Rate profile (SSR)',
|
|
rlm@3
|
279 3 => '(reserved)'
|
|
rlm@3
|
280 ),
|
|
rlm@3
|
281 4 => array (
|
|
rlm@3
|
282 0 => 'AAC_MAIN',
|
|
rlm@3
|
283 1 => 'AAC_LC',
|
|
rlm@3
|
284 2 => 'AAC_SSR',
|
|
rlm@3
|
285 3 => 'AAC_LTP'
|
|
rlm@3
|
286 )
|
|
rlm@3
|
287 );
|
|
rlm@3
|
288 return (isset($lookup[$mpeg_version][$profile_id]) ? $lookup[$mpeg_version][$profile_id] : 'invalid');
|
|
rlm@3
|
289 }
|
|
rlm@3
|
290
|
|
rlm@3
|
291
|
|
rlm@3
|
292
|
|
rlm@3
|
293 public static function AACchannelCountCalculate($program_configs) {
|
|
rlm@3
|
294
|
|
rlm@3
|
295 $channels = 0;
|
|
rlm@3
|
296
|
|
rlm@3
|
297 foreach (array ('front', 'side', 'back') as $placement) {
|
|
rlm@3
|
298 for ($i = 0; $i < $program_configs['num_'.$placement.'_channel_elements']; $i++) {
|
|
rlm@3
|
299
|
|
rlm@3
|
300 // Each element is channel pair (CPE = Channel Pair Element)
|
|
rlm@3
|
301 $channels += 1 + ($program_configs[$placement.'_element_is_cpe'][$i] ? 1 : 0);
|
|
rlm@3
|
302 }
|
|
rlm@3
|
303 }
|
|
rlm@3
|
304
|
|
rlm@3
|
305 return $channels + $program_configs['num_lfe_channel_elements'];
|
|
rlm@3
|
306 }
|
|
rlm@3
|
307
|
|
rlm@3
|
308 }
|
|
rlm@3
|
309
|
|
rlm@3
|
310
|
|
rlm@3
|
311 ?> |
