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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.mpc_old.php |
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18 // | Module for analyzing Musepack/MPEG+ Audio files - SV4-SV6 |
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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.mpc_old.php,v 1.2 2006/11/02 10:48:01 ah Exp $
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23
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24
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25
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26 class getid3_mpc_old 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://www.uni-jena.de/~pfk/mpp/sv8/header.html
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34
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35 $getid3->info['mpc']['header'] = array ();
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36 $info_mpc_header = &$getid3->info['mpc']['header'];
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37
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38 $getid3->info['fileformat'] = 'mpc';
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39 $getid3->info['audio']['dataformat'] = 'mpc';
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40 $getid3->info['audio']['bitrate_mode'] = 'vbr';
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41 $getid3->info['audio']['channels'] = 2; // the format appears to be hardcoded for stereo only
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42 $getid3->info['audio']['lossless'] = false;
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43
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44 fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
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45
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46 $info_mpc_header['size'] = 8;
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47 $getid3->info['avdataoffset'] += $info_mpc_header['size'];
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48
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49 $mpc_header_data = fread($getid3->fp, $info_mpc_header['size']);
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50
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51
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52 // Most of this code adapted from Jurgen Faul's MPEGplus source code - thanks Jurgen! :)
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53 $header_dword[0] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 0, 4));
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54 $header_dword[1] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 4, 4));
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55
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56
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57 // DDDD DDDD CCCC CCCC BBBB BBBB AAAA AAAA
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58 // aaaa aaaa abcd dddd dddd deee eeff ffff
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59 //
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60 // a = bitrate = anything
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61 // b = IS = anything
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62 // c = MS = anything
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63 // d = streamversion = 0000000004 or 0000000005 or 0000000006
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64 // e = maxband = anything
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65 // f = blocksize = 000001 for SV5+, anything(?) for SV4
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66
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67 $info_mpc_header['target_bitrate'] = (($header_dword[0] & 0xFF800000) >> 23);
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68 $info_mpc_header['intensity_stereo'] = (bool)(($header_dword[0] & 0x00400000) >> 22);
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69 $info_mpc_header['mid-side_stereo'] = (bool)(($header_dword[0] & 0x00200000) >> 21);
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70 $info_mpc_header['stream_major_version'] = ($header_dword[0] & 0x001FF800) >> 11;
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71 $info_mpc_header['stream_minor_version'] = 0;
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72 $info_mpc_header['max_band'] = ($header_dword[0] & 0x000007C0) >> 6; // related to lowpass frequency, not sure how it translates exactly
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73 $info_mpc_header['block_size'] = ($header_dword[0] & 0x0000003F);
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74
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75 switch ($info_mpc_header['stream_major_version']) {
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76 case 4:
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77 $info_mpc_header['frame_count'] = ($header_dword[1] >> 16);
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78 break;
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79 case 5:
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80 case 6:
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81 $info_mpc_header['frame_count'] = $header_dword[1];
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82 break;
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83
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84 default:
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85 throw new getid3_exception('Expecting 4, 5 or 6 in version field, found '.$info_mpc_header['stream_major_version'].' instead');
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86 }
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87
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88 if (($info_mpc_header['stream_major_version'] > 4) && ($info_mpc_header['block_size'] != 1)) {
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89 $getid3->warning('Block size expected to be 1, actual value found: '.$info_mpc_header['block_size']);
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90 }
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91
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92 $info_mpc_header['sample_rate'] = $getid3->info['audio']['sample_rate'] = 44100; // AB: used by all files up to SV7
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93 $info_mpc_header['samples'] = $info_mpc_header['frame_count'] * 1152 * $getid3->info['audio']['channels'];
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94
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95 $getid3->info['audio']['bitrate_mode'] = $info_mpc_header['target_bitrate'] == 0 ? 'vbr' : 'cbr';
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96
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97 $getid3->info['mpc']['bitrate'] = ($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8 * 44100 / $info_mpc_header['frame_count'] / 1152;
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98 $getid3->info['audio']['bitrate'] = $getid3->info['mpc']['bitrate'];
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99 $getid3->info['audio']['encoder'] = 'SV'.$info_mpc_header['stream_major_version'];
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100
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101 return true;
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102 }
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103
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104 }
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105
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106
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107 ?> |
