PHP getid3_riff::Analyze方法代码示例

 public function Analyze()
 {
     $getid3 = $this->getid3;
     $getid3->include_module('audio-video.riff');
     // Magic bytes - 'LPAC'
     fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
     $lpac_header = fread($getid3->fp, 14);
     $getid3->info['avdataoffset'] += 14;
     $getid3->info['lpac'] = array();
     $info_lpac =& $getid3->info['lpac'];
     $getid3->info['fileformat'] = 'lpac';
     $getid3->info['audio']['dataformat'] = 'lpac';
     $getid3->info['audio']['lossless'] = true;
     $getid3->info['audio']['bitrate_mode'] = 'vbr';
     $info_lpac['file_version'] = getid3_lib::BigEndian2Int($lpac_header[4]);
     $flags['audio_type'] = getid3_lib::BigEndian2Int($lpac_header[5]);
     $info_lpac['total_samples'] = getid3_lib::BigEndian2Int(substr($lpac_header, 6, 4));
     $flags['parameters'] = getid3_lib::BigEndian2Int(substr($lpac_header, 10, 4));
     $info_lpac['flags']['is_wave'] = (bool) ($flags['audio_type'] & 0x40);
     $info_lpac['flags']['stereo'] = (bool) ($flags['audio_type'] & 0x4);
     $info_lpac['flags']['24_bit'] = (bool) ($flags['audio_type'] & 0x2);
     $info_lpac['flags']['16_bit'] = (bool) ($flags['audio_type'] & 0x1);
     if ($info_lpac['flags']['24_bit'] && $info_lpac['flags']['16_bit']) {
         $getid3->warning('24-bit and 16-bit flags cannot both be set');
     }
     $info_lpac['flags']['fast_compress'] = (bool) ($flags['parameters'] & 0x40000000);
     $info_lpac['flags']['random_access'] = (bool) ($flags['parameters'] & 0x8000000);
     $info_lpac['block_length'] = pow(2, ($flags['parameters'] & 0x7000000) >> 24) * 256;
     $info_lpac['flags']['adaptive_prediction_order'] = (bool) ($flags['parameters'] & 0x800000);
     $info_lpac['flags']['adaptive_quantization'] = (bool) ($flags['parameters'] & 0x400000);
     $info_lpac['flags']['joint_stereo'] = (bool) ($flags['parameters'] & 0x40000);
     $info_lpac['quantization'] = ($flags['parameters'] & 0x1f00) >> 8;
     $info_lpac['max_prediction_order'] = $flags['parameters'] & 0x3f;
     if ($info_lpac['flags']['fast_compress'] && $info_lpac['max_prediction_order'] != 3) {
         $getid3->warning('max_prediction_order expected to be "3" if fast_compress is true, actual value is "' . $info_lpac['max_prediction_order'] . '"');
     }
     switch ($info_lpac['file_version']) {
         case 6:
             if ($info_lpac['flags']['adaptive_quantization']) {
                 $getid3->warning('adaptive_quantization expected to be false in LPAC file stucture v6, actually true');
             }
             if ($info_lpac['quantization'] != 20) {
                 $getid3->warning('Quantization expected to be 20 in LPAC file stucture v6, actually ' . $info_lpac['flags']['Q']);
             }
             break;
         default:
             //$getid3->warning('This version of getID3() only supports LPAC file format version 6, this file is version '.$info_lpac['file_version'].' - please report to info@getid3.org');
             break;
     }
     // Clone getid3 - messing with something - better safe than sorry
     $clone = clone $getid3;
     // Analyze clone by fp
     $riff = new getid3_riff($clone);
     $riff->Analyze();
     // Import from clone and destroy
     $getid3->info['avdataoffset'] = $clone->info['avdataoffset'];
     $getid3->info['riff'] = $clone->info['riff'];
     //$info_lpac['comments']['comment'] = $clone->info['comments'];
     $getid3->info['audio']['sample_rate'] = $clone->info['audio']['sample_rate'];
     $getid3->warnings($clone->warnings());
     unset($clone);
     $getid3->info['audio']['channels'] = $info_lpac['flags']['stereo'] ? 2 : 1;
     if ($info_lpac['flags']['24_bit']) {
         $getid3->info['audio']['bits_per_sample'] = $getid3->info['riff']['audio'][0]['bits_per_sample'];
     } elseif ($info_lpac['flags']['16_bit']) {
         $getid3->info['audio']['bits_per_sample'] = 16;
     } else {
         $getid3->info['audio']['bits_per_sample'] = 8;
     }
     if ($info_lpac['flags']['fast_compress']) {
         // fast
         $getid3->info['audio']['encoder_options'] = '-1';
     } else {
         switch ($info_lpac['max_prediction_order']) {
             case 20:
                 // simple
                 $getid3->info['audio']['encoder_options'] = '-2';
                 break;
             case 30:
                 // medium
                 $getid3->info['audio']['encoder_options'] = '-3';
                 break;
             case 40:
                 // high
                 $getid3->info['audio']['encoder_options'] = '-4';
                 break;
             case 60:
                 // extrahigh
                 $getid3->info['audio']['encoder_options'] = '-5';
                 break;
         }
     }
     $getid3->info['playtime_seconds'] = $info_lpac['total_samples'] / $getid3->info['audio']['sample_rate'];
     $getid3->info['audio']['bitrate'] = ($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8 / $getid3->info['playtime_seconds'];
     return true;
 }

 function Analyze()
 {
     $info =& $this->getid3->info;
     fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
     $LPACheader = fread($this->getid3->fp, 14);
     if (substr($LPACheader, 0, 4) != 'LPAC') {
         $info['error'][] = 'Expected "LPAC" at offset ' . $info['avdataoffset'] . ', found "' . $StreamMarker . '"';
         return false;
     }
     $info['avdataoffset'] += 14;
     $info['fileformat'] = 'lpac';
     $info['audio']['dataformat'] = 'lpac';
     $info['audio']['lossless'] = true;
     $info['audio']['bitrate_mode'] = 'vbr';
     $info['lpac']['file_version'] = getid3_lib::BigEndian2Int(substr($LPACheader, 4, 1));
     $flags['audio_type'] = getid3_lib::BigEndian2Int(substr($LPACheader, 5, 1));
     $info['lpac']['total_samples'] = getid3_lib::BigEndian2Int(substr($LPACheader, 6, 4));
     $flags['parameters'] = getid3_lib::BigEndian2Int(substr($LPACheader, 10, 4));
     $info['lpac']['flags']['is_wave'] = (bool) ($flags['audio_type'] & 0x40);
     $info['lpac']['flags']['stereo'] = (bool) ($flags['audio_type'] & 0x4);
     $info['lpac']['flags']['24_bit'] = (bool) ($flags['audio_type'] & 0x2);
     $info['lpac']['flags']['16_bit'] = (bool) ($flags['audio_type'] & 0x1);
     if ($info['lpac']['flags']['24_bit'] && $info['lpac']['flags']['16_bit']) {
         $info['warning'][] = '24-bit and 16-bit flags cannot both be set';
     }
     $info['lpac']['flags']['fast_compress'] = (bool) ($flags['parameters'] & 0x40000000);
     $info['lpac']['flags']['random_access'] = (bool) ($flags['parameters'] & 0x8000000);
     $info['lpac']['block_length'] = pow(2, ($flags['parameters'] & 0x7000000) >> 24) * 256;
     $info['lpac']['flags']['adaptive_prediction_order'] = (bool) ($flags['parameters'] & 0x800000);
     $info['lpac']['flags']['adaptive_quantization'] = (bool) ($flags['parameters'] & 0x400000);
     $info['lpac']['flags']['joint_stereo'] = (bool) ($flags['parameters'] & 0x40000);
     $info['lpac']['quantization'] = ($flags['parameters'] & 0x1f00) >> 8;
     $info['lpac']['max_prediction_order'] = $flags['parameters'] & 0x3f;
     if ($info['lpac']['flags']['fast_compress'] && $info['lpac']['max_prediction_order'] != 3) {
         $info['warning'][] = 'max_prediction_order expected to be "3" if fast_compress is true, actual value is "' . $info['lpac']['max_prediction_order'] . '"';
     }
     switch ($info['lpac']['file_version']) {
         case 6:
             if ($info['lpac']['flags']['adaptive_quantization']) {
                 $info['warning'][] = 'adaptive_quantization expected to be false in LPAC file stucture v6, actually true';
             }
             if ($info['lpac']['quantization'] != 20) {
                 $info['warning'][] = 'Quantization expected to be 20 in LPAC file stucture v6, actually ' . $info['lpac']['flags']['Q'];
             }
             break;
         default:
             //$info['warning'][] = 'This version of getID3() ['.$this->getid3->version().'] only supports LPAC file format version 6, this file is version '.$info['lpac']['file_version'].' - please report to info@getid3.org';
             break;
     }
     $getid3_temp = new getID3();
     $getid3_temp->openfile($this->getid3->filename);
     $getid3_temp->info = $info;
     $getid3_riff = new getid3_riff($getid3_temp);
     $getid3_riff->Analyze();
     $info['avdataoffset'] = $getid3_temp->info['avdataoffset'];
     $info['riff'] = $getid3_temp->info['riff'];
     $info['error'] = $getid3_temp->info['error'];
     $info['warning'] = $getid3_temp->info['warning'];
     $info['lpac']['comments']['comment'] = $getid3_temp->info['comments'];
     $info['audio']['sample_rate'] = $getid3_temp->info['audio']['sample_rate'];
     unset($getid3_temp, $getid3_riff);
     $info['audio']['channels'] = $info['lpac']['flags']['stereo'] ? 2 : 1;
     if ($info['lpac']['flags']['24_bit']) {
         $info['audio']['bits_per_sample'] = $info['riff']['audio'][0]['bits_per_sample'];
     } elseif ($info['lpac']['flags']['16_bit']) {
         $info['audio']['bits_per_sample'] = 16;
     } else {
         $info['audio']['bits_per_sample'] = 8;
     }
     if ($info['lpac']['flags']['fast_compress']) {
         // fast
         $info['audio']['encoder_options'] = '-1';
     } else {
         switch ($info['lpac']['max_prediction_order']) {
             case 20:
                 // simple
                 $info['audio']['encoder_options'] = '-2';
                 break;
             case 30:
                 // medium
                 $info['audio']['encoder_options'] = '-3';
                 break;
             case 40:
                 // high
                 $info['audio']['encoder_options'] = '-4';
                 break;
             case 60:
                 // extrahigh
                 $info['audio']['encoder_options'] = '-5';
                 break;
         }
     }
     $info['playtime_seconds'] = $info['lpac']['total_samples'] / $info['audio']['sample_rate'];
     $info['audio']['bitrate'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['playtime_seconds'];
     return true;
 }

 public function ParseRIFFdata(&$RIFFdata)
 {
     $info =& $this->getid3->info;
     if ($RIFFdata) {
         $tempfile = tempnam(GETID3_TEMP_DIR, 'getID3');
         $fp_temp = fopen($tempfile, 'wb');
         $RIFFdataLength = strlen($RIFFdata);
         $NewLengthString = getid3_lib::LittleEndian2String($RIFFdataLength, 4);
         for ($i = 0; $i < 4; $i++) {
             $RIFFdata[$i + 4] = $NewLengthString[$i];
         }
         fwrite($fp_temp, $RIFFdata);
         fclose($fp_temp);
         $getid3_temp = new getID3();
         $getid3_temp->openfile($tempfile);
         $getid3_temp->info['filesize'] = $RIFFdataLength;
         $getid3_temp->info['filenamepath'] = $info['filenamepath'];
         $getid3_temp->info['tags'] = $info['tags'];
         $getid3_temp->info['warning'] = $info['warning'];
         $getid3_temp->info['error'] = $info['error'];
         $getid3_temp->info['comments'] = $info['comments'];
         $getid3_temp->info['audio'] = isset($info['audio']) ? $info['audio'] : array();
         $getid3_temp->info['video'] = isset($info['video']) ? $info['video'] : array();
         $getid3_riff = new getid3_riff($getid3_temp);
         $getid3_riff->Analyze();
         $info['riff'] = $getid3_temp->info['riff'];
         $info['warning'] = $getid3_temp->info['warning'];
         $info['error'] = $getid3_temp->info['error'];
         $info['tags'] = $getid3_temp->info['tags'];
         $info['comments'] = $getid3_temp->info['comments'];
         unset($getid3_riff, $getid3_temp);
         unlink($tempfile);
     }
     return false;
 }

 function Analyze()
 {
     $info =& $this->getid3->info;
     $offset = 0;
     fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
     $rawdata = fread($this->getid3->fp, $this->getid3->fread_buffer_size());
     switch (substr($rawdata, $offset, 4)) {
         case 'LA02':
         case 'LA03':
         case 'LA04':
             $info['fileformat'] = 'la';
             $info['audio']['dataformat'] = 'la';
             $info['audio']['lossless'] = true;
             $info['la']['version_major'] = (int) substr($rawdata, $offset + 2, 1);
             $info['la']['version_minor'] = (int) substr($rawdata, $offset + 3, 1);
             $info['la']['version'] = (double) $info['la']['version_major'] + $info['la']['version_minor'] / 10;
             $offset += 4;
             $info['la']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
             $offset += 4;
             if ($info['la']['uncompressed_size'] == 0) {
                 $info['error'][] = 'Corrupt LA file: uncompressed_size == zero';
                 return false;
             }
             $WAVEchunk = substr($rawdata, $offset, 4);
             if ($WAVEchunk !== 'WAVE') {
                 $info['error'][] = 'Expected "WAVE" (' . getid3_lib::PrintHexBytes('WAVE') . ') at offset ' . $offset . ', found "' . $WAVEchunk . '" (' . getid3_lib::PrintHexBytes($WAVEchunk) . ') instead.';
                 return false;
             }
             $offset += 4;
             $info['la']['fmt_size'] = 24;
             if ($info['la']['version'] >= 0.3) {
                 $info['la']['fmt_size'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
                 $info['la']['header_size'] = 49 + $info['la']['fmt_size'] - 24;
                 $offset += 4;
             } else {
                 // version 0.2 didn't support additional data blocks
                 $info['la']['header_size'] = 41;
             }
             $fmt_chunk = substr($rawdata, $offset, 4);
             if ($fmt_chunk !== 'fmt ') {
                 $info['error'][] = 'Expected "fmt " (' . getid3_lib::PrintHexBytes('fmt ') . ') at offset ' . $offset . ', found "' . $fmt_chunk . '" (' . getid3_lib::PrintHexBytes($fmt_chunk) . ') instead.';
                 return false;
             }
             $offset += 4;
             $fmt_size = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
             $offset += 4;
             $info['la']['raw']['format'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
             $offset += 2;
             $info['la']['channels'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
             $offset += 2;
             if ($info['la']['channels'] == 0) {
                 $info['error'][] = 'Corrupt LA file: channels == zero';
                 return false;
             }
             $info['la']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
             $offset += 4;
             if ($info['la']['sample_rate'] == 0) {
                 $info['error'][] = 'Corrupt LA file: sample_rate == zero';
                 return false;
             }
             $info['la']['bytes_per_second'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
             $offset += 4;
             $info['la']['bytes_per_sample'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
             $offset += 2;
             $info['la']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2));
             $offset += 2;
             $info['la']['samples'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
             $offset += 4;
             $info['la']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 1));
             $offset += 1;
             $info['la']['flags']['seekable'] = (bool) ($info['la']['raw']['flags'] & 0x1);
             if ($info['la']['version'] >= 0.4) {
                 $info['la']['flags']['high_compression'] = (bool) ($info['la']['raw']['flags'] & 0x2);
             }
             $info['la']['original_crc'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
             $offset += 4;
             // mikeØbevin*de
             // Basically, the blocksize/seekevery are 61440/19 in La0.4 and 73728/16
             // in earlier versions. A seekpoint is added every blocksize * seekevery
             // samples, so 4 * int(totalSamples / (blockSize * seekEvery)) should
             // give the number of bytes used for the seekpoints. Of course, if seeking
             // is disabled, there are no seekpoints stored.
             if ($info['la']['version'] >= 0.4) {
                 $info['la']['blocksize'] = 61440;
                 $info['la']['seekevery'] = 19;
             } else {
                 $info['la']['blocksize'] = 73728;
                 $info['la']['seekevery'] = 16;
             }
             $info['la']['seekpoint_count'] = 0;
             if ($info['la']['flags']['seekable']) {
                 $info['la']['seekpoint_count'] = floor($info['la']['samples'] / ($info['la']['blocksize'] * $info['la']['seekevery']));
                 for ($i = 0; $i < $info['la']['seekpoint_count']; $i++) {
                     $info['la']['seekpoints'][] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4));
                     $offset += 4;
                 }
             }
             if ($info['la']['version'] >= 0.3) {
                 // Following the main header information, the program outputs all of the
                 // seekpoints. Following these is what I called the 'footer start',
//.........这里部分代码省略.........