module.audio-video.riff.php

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					$thisfile_riff_audio['total_samples']    =         getid3_lib::BigEndian2Int(substr($thisfile_riff_RIFFsubtype_COMM_0_data,  2,  4), false);
					$thisfile_riff_audio['bits_per_sample']  =         getid3_lib::BigEndian2Int(substr($thisfile_riff_RIFFsubtype_COMM_0_data,  6,  2), true);
					$thisfile_riff_audio['sample_rate']      = (int) getid3_lib::BigEndian2Float(substr($thisfile_riff_RIFFsubtype_COMM_0_data,  8, 10));

					if ($thisfile_riff[$RIFFsubtype]['COMM'][0]['size'] > 18) {
						$thisfile_riff_audio['codec_fourcc'] =                                   substr($thisfile_riff_RIFFsubtype_COMM_0_data, 18,  4);
						$CodecNameSize                       =         getid3_lib::BigEndian2Int(substr($thisfile_riff_RIFFsubtype_COMM_0_data, 22,  1), false);
						$thisfile_riff_audio['codec_name']   =                                   substr($thisfile_riff_RIFFsubtype_COMM_0_data, 23,  $CodecNameSize);
						switch ($thisfile_riff_audio['codec_name']) {
							case 'NONE':
								$thisfile_audio['codec']    = 'Pulse Code Modulation (PCM)';
								$thisfile_audio['lossless'] = true;
								break;

							case '':
								switch ($thisfile_riff_audio['codec_fourcc']) {
									// http://developer.apple.com/qa/snd/snd07.html
									case 'sowt':
										$thisfile_riff_audio['codec_name'] = 'Two\'s Compliment Little-Endian PCM';
										$thisfile_audio['lossless'] = true;
										break;

									case 'twos':
										$thisfile_riff_audio['codec_name'] = 'Two\'s Compliment Big-Endian PCM';
										$thisfile_audio['lossless'] = true;
										break;

									default:
										break;
								}
								break;

							default:
								$thisfile_audio['codec']    = $thisfile_riff_audio['codec_name'];
								$thisfile_audio['lossless'] = false;
								break;
						}
					}

					$thisfile_audio['channels']        = $thisfile_riff_audio['channels'];
					if ($thisfile_riff_audio['bits_per_sample'] > 0) {
						$thisfile_audio['bits_per_sample'] = $thisfile_riff_audio['bits_per_sample'];
					}
					$thisfile_audio['sample_rate']     = $thisfile_riff_audio['sample_rate'];
					if ($thisfile_audio['sample_rate'] == 0) {
						$ThisFileInfo['error'][] = 'Corrupted AIFF file: sample_rate == zero';
						return false;
					}
					$ThisFileInfo['playtime_seconds'] = $thisfile_riff_audio['total_samples'] / $thisfile_audio['sample_rate'];
				}

				if (isset($thisfile_riff[$RIFFsubtype]['COMT'])) {
					$offset = 0;
					$CommentCount                                           = getid3_lib::BigEndian2Int(substr($thisfile_riff[$RIFFsubtype]['COMT'][0]['data'], $offset, 2), false);
					$offset += 2;
					for ($i = 0; $i < $CommentCount; $i++) {
						$ThisFileInfo['comments_raw'][$i]['timestamp']      = getid3_lib::BigEndian2Int(substr($thisfile_riff[$RIFFsubtype]['COMT'][0]['data'], $offset, 4), false);
						$offset += 4;
						$ThisFileInfo['comments_raw'][$i]['marker_id']      = getid3_lib::BigEndian2Int(substr($thisfile_riff[$RIFFsubtype]['COMT'][0]['data'], $offset, 2), true);
						$offset += 2;
						$CommentLength                                      = getid3_lib::BigEndian2Int(substr($thisfile_riff[$RIFFsubtype]['COMT'][0]['data'], $offset, 2), false);
						$offset += 2;
						$ThisFileInfo['comments_raw'][$i]['comment']        =                           substr($thisfile_riff[$RIFFsubtype]['COMT'][0]['data'], $offset, $CommentLength);
						$offset += $CommentLength;

						$ThisFileInfo['comments_raw'][$i]['timestamp_unix'] = getid3_lib::DateMac2Unix($ThisFileInfo['comments_raw'][$i]['timestamp']);
						$thisfile_riff['comments']['comment'][] = $ThisFileInfo['comments_raw'][$i]['comment'];
					}
				}

				$CommentsChunkNames = array('NAME'=>'title', 'author'=>'artist', '(c) '=>'copyright', 'ANNO'=>'comment');
				foreach ($CommentsChunkNames as $key => $value) {
					if (isset($thisfile_riff[$RIFFsubtype][$key][0]['data'])) {
						$thisfile_riff['comments'][$value][] = $thisfile_riff[$RIFFsubtype][$key][0]['data'];
					}
				}
				break;

			case '8SVX':
				$thisfile_audio['bitrate_mode']    = 'cbr';
				$thisfile_audio_dataformat         = '8svx';
				$thisfile_audio['bits_per_sample'] = 8;
				$thisfile_audio['channels']        = 1; // overridden below, if need be
				$ThisFileInfo['mime_type']                = 'audio/x-aiff';

				if (isset($thisfile_riff[$RIFFsubtype]['BODY'][0]['offset'])) {
					$thisfile_avdataoffset = $thisfile_riff[$RIFFsubtype]['BODY'][0]['offset'] + 8;
					$thisfile_avdataend    = $thisfile_avdataoffset + $thisfile_riff[$RIFFsubtype]['BODY'][0]['size'];
					if ($thisfile_avdataend > $ThisFileInfo['filesize']) {
						$ThisFileInfo['warning'][] = 'Probable truncated AIFF file: expecting '.$thisfile_riff[$RIFFsubtype]['BODY'][0]['size'].' bytes of audio data, only '.($ThisFileInfo['filesize'] - $thisfile_avdataoffset).' bytes found';
					}
				}

				if (isset($thisfile_riff[$RIFFsubtype]['VHDR'][0]['offset'])) {
					// shortcut
					$thisfile_riff_RIFFsubtype_VHDR_0 = &$thisfile_riff[$RIFFsubtype]['VHDR'][0];

					$thisfile_riff_RIFFsubtype_VHDR_0['oneShotHiSamples']  =   getid3_lib::BigEndian2Int(substr($thisfile_riff_RIFFsubtype_VHDR_0['data'],  0, 4));
					$thisfile_riff_RIFFsubtype_VHDR_0['repeatHiSamples']   =   getid3_lib::BigEndian2Int(substr($thisfile_riff_RIFFsubtype_VHDR_0['data'],  4, 4));
					$thisfile_riff_RIFFsubtype_VHDR_0['samplesPerHiCycle'] =   getid3_lib::BigEndian2Int(substr($thisfile_riff_RIFFsubtype_VHDR_0['data'],  8, 4));
					$thisfile_riff_RIFFsubtype_VHDR_0['samplesPerSec']     =   getid3_lib::BigEndian2Int(substr($thisfile_riff_RIFFsubtype_VHDR_0['data'], 12, 2));
					$thisfile_riff_RIFFsubtype_VHDR_0['ctOctave']          =   getid3_lib::BigEndian2Int(substr($thisfile_riff_RIFFsubtype_VHDR_0['data'], 14, 1));
					$thisfile_riff_RIFFsubtype_VHDR_0['sCompression']      =   getid3_lib::BigEndian2Int(substr($thisfile_riff_RIFFsubtype_VHDR_0['data'], 15, 1));
					$thisfile_riff_RIFFsubtype_VHDR_0['Volume']            = getid3_lib::FixedPoint16_16(substr($thisfile_riff_RIFFsubtype_VHDR_0['data'], 16, 4));

					$thisfile_audio['sample_rate'] = $thisfile_riff_RIFFsubtype_VHDR_0['samplesPerSec'];

					switch ($thisfile_riff_RIFFsubtype_VHDR_0['sCompression']) {
						case 0:
							$thisfile_audio['codec']    = 'Pulse Code Modulation (PCM)';
							$thisfile_audio['lossless'] = true;
							$ActualBitsPerSample               = 8;
							break;

						case 1:
							$thisfile_audio['codec']    = 'Fibonacci-delta encoding';
							$thisfile_audio['lossless'] = false;
							$ActualBitsPerSample               = 4;
							break;

						default:
							$ThisFileInfo['warning'][] = 'Unexpected sCompression value in 8SVX.VHDR chunk - expecting 0 or 1, found "'.sCompression.'"';
							break;
					}
				}

				if (isset($thisfile_riff[$RIFFsubtype]['CHAN'][0]['data'])) {
					$ChannelsIndex = getid3_lib::BigEndian2Int(substr($thisfile_riff[$RIFFsubtype]['CHAN'][0]['data'], 0, 4));
					switch ($ChannelsIndex) {
						case 6: // Stereo
							$thisfile_audio['channels'] = 2;
							break;

						case 2: // Left channel only
						case 4: // Right channel only
							$thisfile_audio['channels'] = 1;
							break;

						default:
							$ThisFileInfo['warning'][] = 'Unexpected value in 8SVX.CHAN chunk - expecting 2 or 4 or 6, found "'.$ChannelsIndex.'"';
							break;
					}

				}

				$CommentsChunkNames = array('NAME'=>'title', 'author'=>'artist', '(c) '=>'copyright', 'ANNO'=>'comment');
				foreach ($CommentsChunkNames as $key => $value) {
					if (isset($thisfile_riff[$RIFFsubtype][$key][0]['data'])) {
						$thisfile_riff['comments'][$value][] = $thisfile_riff[$RIFFsubtype][$key][0]['data'];
					}
				}

				$thisfile_audio['bitrate'] = $thisfile_audio['sample_rate'] * $ActualBitsPerSample * $thisfile_audio['channels'];
				if (!empty($thisfile_audio['bitrate'])) {
					$ThisFileInfo['playtime_seconds'] = ($thisfile_avdataend - $thisfile_avdataoffset) / ($thisfile_audio['bitrate'] / 8);
				}
				break;


			case 'CDXA':
				$ThisFileInfo['mime_type']      = 'video/mpeg';
				if (!empty($thisfile_riff['CDXA']['data'][0]['size'])) {
					$GETID3_ERRORARRAY = &$ThisFileInfo['warning'];
					if (getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.mpeg.php', __FILE__, false)) {
						$dummy = $ThisFileInfo;
						$dummy['error'] = array();
						$mpeg_scanner = new getid3_mpeg($fd, $dummy);
						if (empty($dummy['error'])) {
							$ThisFileInfo['audio']   = $dummy['audio'];
							$ThisFileInfo['video']   = $dummy['video'];
							$ThisFileInfo['mpeg']    = $dummy['mpeg'];
							$ThisFileInfo['warning'] = $dummy['warning'];
						}
					}
				}
				break;


			default:
				$ThisFileInfo['error'][] = 'Unknown RIFF type: expecting one of (WAVE|RMP3|AVI |CDDA|AIFF|AIFC|8SVX|CDXA), found "'.$RIFFsubtype.'" instead';
				unset($ThisFileInfo['fileformat']);
				break;
		}

		if (isset($thisfile_riff_WAVE['DISP']) && is_array($thisfile_riff_WAVE['DISP'])) {
			$thisfile_riff['comments']['title'][] = trim(substr($thisfile_riff_WAVE['DISP'][count($thisfile_riff_WAVE['DISP']) - 1]['data'], 4));
		}
		if (isset($thisfile_riff_WAVE['INFO']) && is_array($thisfile_riff_WAVE['INFO'])) {
			$RIFFinfoKeyLookup = array(
				'IARL'=>'archivallocation',
				'IART'=>'artist',
				'ICDS'=>'costumedesigner',
				'ICMS'=>'commissionedby',
				'ICMT'=>'comment',
				'ICNT'=>'country',
				'ICOP'=>'copyright',
				'ICRD'=>'creationdate',
				'IDIM'=>'dimensions',
				'IDIT'=>'digitizationdate',
				'IDPI'=>'resolution',
				'IDST'=>'distributor',
				'IEDT'=>'editor',
				'IENG'=>'engineers',
				'IFRM'=>'accountofparts',
				'IGNR'=>'genre',
				'IKEY'=>'keywords',
				'ILGT'=>'lightness',
				'ILNG'=>'language',
				'IMED'=>'orignalmedium',
				'IMUS'=>'composer',
				'INAM'=>'title',
				'IPDS'=>'productiondesigner',
				'IPLT'=>'palette',
				'IPRD'=>'product',
				'IPRO'=>'producer',
				'IPRT'=>'part',
				'IRTD'=>'rating',
				'ISBJ'=>'subject',
				'ISFT'=>'software',
				'ISGN'=>'secondarygenre',
				'ISHP'=>'sharpness',
				'ISRC'=>'sourcesupplier',
				'ISRF'=>'digitizationsource',
				'ISTD'=>'productionstudio',
				'ISTR'=>'starring',
				'ITCH'=>'encoded_by',
				'IWEB'=>'url',
				'IWRI'=>'writer'
			);
			foreach ($RIFFinfoKeyLookup as $key => $value) {
				if (isset($thisfile_riff_WAVE['INFO'][$key])) {
					foreach ($thisfile_riff_WAVE['INFO'][$key] as $commentid => $commentdata) {
						if (trim($commentdata['data']) != '') {
							$thisfile_riff['comments'][$value][] = trim($commentdata['data']);
						}
					}
				}
			}