module.audio-video.riff.php

一个用PHP编写的

<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <[e-mail]>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details                             //
/////////////////////////////////////////////////////////////////
//                                                             //
// module.audio-video.riff.php                                 //
// module for analyzing RIFF files                             //
// multiple formats supported by this module:                  //
//    Wave, AVI, AIFF/AIFC, (MP3,AC3)/RIFF, Wavpack v3, 8SVX   //
// dependencies: module.audio.mp3.php                          //
//               module.audio.ac3.php (optional)               //
//                                                            ///
/////////////////////////////////////////////////////////////////

getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.mp3.php', __FILE__, true);

class getid3_riff
{

	function getid3_riff(&$fd, &$ThisFileInfo) {

		// initialize these values to an empty array, otherwise they default to NULL
		// and you can't append array values to a NULL value
		$ThisFileInfo['riff'] = array('raw'=>array());

		// Shortcuts
		$thisfile_riff             = &$ThisFileInfo['riff'];
		$thisfile_riff_raw         = &$thisfile_riff['raw'];
		$thisfile_audio            = &$ThisFileInfo['audio'];
		$thisfile_video            = &$ThisFileInfo['video'];
		$thisfile_avdataoffset     = &$ThisFileInfo['avdataoffset'];
		$thisfile_avdataend        = &$ThisFileInfo['avdataend'];
		$thisfile_audio_dataformat = &$thisfile_audio['dataformat'];
		$thisfile_riff_audio       = &$thisfile_riff['audio'];
		$thisfile_riff_video       = &$thisfile_riff['video'];


		$Original['avdataoffset'] = $thisfile_avdataoffset;
		$Original['avdataend']    = $thisfile_avdataend;

		fseek($fd, $thisfile_avdataoffset, SEEK_SET);
		$RIFFheader = fread($fd, 12);
		$RIFFsubtype = substr($RIFFheader, 8, 4);
		switch (substr($RIFFheader, 0, 4)) {
			case 'FORM':
				$ThisFileInfo['fileformat']   = 'aiff';
				$RIFFheaderSize               = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($RIFFheader, 4, 4));
				$thisfile_riff[$RIFFsubtype]  = getid3_riff::ParseRIFF($fd, $thisfile_avdataoffset + 12, $thisfile_avdataoffset + $RIFFheaderSize, $ThisFileInfo);
				$thisfile_riff['header_size'] = $RIFFheaderSize;
				break;

			case 'RIFF':
			case 'SDSS':  // SDSS is identical to RIFF, just renamed. Used by SmartSound QuickTracks (www.smartsound.com)
			case 'RMP3':  // RMP3 is identical to RIFF, just renamed. Used by [unknown program] when creating RIFF-MP3s
				if ($RIFFsubtype == 'RMP3') {
					// RMP3 is identical to WAVE, just renamed. Used by [unknown program] when creating RIFF-MP3s
					$RIFFsubtype = 'WAVE';
				}

				$ThisFileInfo['fileformat']   = 'riff';
				$RIFFheaderSize               = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($RIFFheader, 4, 4));
				$thisfile_riff[$RIFFsubtype]  = getid3_riff::ParseRIFF($fd, $thisfile_avdataoffset + 12, $thisfile_avdataoffset + $RIFFheaderSize, $ThisFileInfo);
				$thisfile_riff['header_size'] = $RIFFheaderSize;
				if ($RIFFsubtype == 'WAVE') {
					$thisfile_riff_WAVE = &$thisfile_riff['WAVE'];
				}
				break;

			default:
				$ThisFileInfo['error'][] = 'Cannot parse RIFF (this is maybe not a RIFF / WAV / AVI file?) - expecting "FORM|RIFF|SDSS|RMP3" found "'.$RIFFsubtype.'" instead';
				unset($ThisFileInfo['fileformat']);
				return false;
				break;
		}

		$streamindex = 0;
		switch ($RIFFsubtype) {
			case 'WAVE':
				if (empty($thisfile_audio['bitrate_mode'])) {
					$thisfile_audio['bitrate_mode'] = 'cbr';
				}
				if (empty($thisfile_audio_dataformat)) {
					$thisfile_audio_dataformat = 'wav';
				}

				if (isset($thisfile_riff_WAVE['data'][0]['offset'])) {
					$thisfile_avdataoffset = $thisfile_riff_WAVE['data'][0]['offset'] + 8;
					$thisfile_avdataend    = $thisfile_avdataoffset + $thisfile_riff_WAVE['data'][0]['size'];
				}
				if (isset($thisfile_riff_WAVE['fmt '][0]['data'])) {

					$thisfile_riff_audio[$streamindex] = getid3_riff::RIFFparseWAVEFORMATex($thisfile_riff_WAVE['fmt '][0]['data']);
					$thisfile_audio['wformattag'] = $thisfile_riff_audio[$streamindex]['raw']['wFormatTag'];
					if (@$thisfile_riff_audio[$streamindex]['bitrate'] == 0) {
						$ThisFileInfo['error'][] = 'Corrupt RIFF file: bitrate_audio == zero';
						return false;
					}
					$thisfile_riff_raw['fmt '] = $thisfile_riff_audio[$streamindex]['raw'];
					unset($thisfile_riff_audio[$streamindex]['raw']);
					$thisfile_audio['streams'][$streamindex] = $thisfile_riff_audio[$streamindex];

					$thisfile_audio = getid3_lib::array_merge_noclobber($thisfile_audio, $thisfile_riff_audio[$streamindex]);
					if (substr($thisfile_audio['codec'], 0, strlen('unknown: 0x')) == 'unknown: 0x') {
						$ThisFileInfo['warning'][] = 'Audio codec = '.$thisfile_audio['codec'];
					}
					$thisfile_audio['bitrate'] = $thisfile_riff_audio[$streamindex]['bitrate'];

					$ThisFileInfo['playtime_seconds'] = (float) ((($thisfile_avdataend - $thisfile_avdataoffset) * 8) / $thisfile_audio['bitrate']);

					$thisfile_audio['lossless'] = false;
					if (isset($thisfile_riff_WAVE['data'][0]['offset']) && isset($thisfile_riff_raw['fmt ']['wFormatTag'])) {
						switch ($thisfile_riff_raw['fmt ']['wFormatTag']) {

							case 0x0001:  // PCM
								$thisfile_audio['lossless'] = true;
								break;

							case 0x2000:  // AC-3
								$thisfile_audio_dataformat = 'ac3';
								break;

							default:
								// do nothing
								break;

						}
					}
					$thisfile_audio['streams'][$streamindex]['wformattag']   = $thisfile_audio['wformattag'];
					$thisfile_audio['streams'][$streamindex]['bitrate_mode'] = $thisfile_audio['bitrate_mode'];
					$thisfile_audio['streams'][$streamindex]['lossless']     = $thisfile_audio['lossless'];
					$thisfile_audio['streams'][$streamindex]['dataformat']   = $thisfile_audio_dataformat;
				}

				if (isset($thisfile_riff_WAVE['rgad'][0]['data'])) {

					// shortcuts
					$rgadData = &$thisfile_riff_WAVE['rgad'][0]['data'];
					$thisfile_riff_raw['rgad']    = array('track'=>array(), 'album'=>array());
					$thisfile_riff_raw_rgad       = &$thisfile_riff_raw['rgad'];
					$thisfile_riff_raw_rgad_track = &$thisfile_riff_raw_rgad['track'];
					$thisfile_riff_raw_rgad_album = &$thisfile_riff_raw_rgad['album'];

					$thisfile_riff_raw_rgad['fPeakAmplitude']      =               getid3_lib::LittleEndian2Float(substr($rgadData, 0, 4));
					$thisfile_riff_raw_rgad['nRadioRgAdjust']      = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($rgadData, 4, 2));
					$thisfile_riff_raw_rgad['nAudiophileRgAdjust'] = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($rgadData, 6, 2));

					$nRadioRgAdjustBitstring      = str_pad(getid3_lib::Dec2Bin($thisfile_riff_raw_rgad['nRadioRgAdjust']), 16, '0', STR_PAD_LEFT);
					$nAudiophileRgAdjustBitstring = str_pad(getid3_lib::Dec2Bin($thisfile_riff_raw_rgad['nAudiophileRgAdjust']), 16, '0', STR_PAD_LEFT);
					$thisfile_riff_raw_rgad_track['name']       = getid3_lib::Bin2Dec(substr($nRadioRgAdjustBitstring, 0, 3));
					$thisfile_riff_raw_rgad_track['originator'] = getid3_lib::Bin2Dec(substr($nRadioRgAdjustBitstring, 3, 3));
					$thisfile_riff_raw_rgad_track['signbit']    = getid3_lib::Bin2Dec(substr($nRadioRgAdjustBitstring, 6, 1));
					$thisfile_riff_raw_rgad_track['adjustment'] = getid3_lib::Bin2Dec(substr($nRadioRgAdjustBitstring, 7, 9));
					$thisfile_riff_raw_rgad_album['name']       = getid3_lib::Bin2Dec(substr($nAudiophileRgAdjustBitstring, 0, 3));
					$thisfile_riff_raw_rgad_album['originator'] = getid3_lib::Bin2Dec(substr($nAudiophileRgAdjustBitstring, 3, 3));
					$thisfile_riff_raw_rgad_album['signbit']    = getid3_lib::Bin2Dec(substr($nAudiophileRgAdjustBitstring, 6, 1));
					$thisfile_riff_raw_rgad_album['adjustment'] = getid3_lib::Bin2Dec(substr($nAudiophileRgAdjustBitstring, 7, 9));

					$thisfile_riff['rgad']['peakamplitude'] = $thisfile_riff_raw_rgad['fPeakAmplitude'];
					if (($thisfile_riff_raw_rgad_track['name'] != 0) && ($thisfile_riff_raw_rgad_track['originator'] != 0)) {
						$thisfile_riff['rgad']['track']['name']            = getid3_lib::RGADnameLookup($thisfile_riff_raw_rgad_track['name']);
						$thisfile_riff['rgad']['track']['originator']      = getid3_lib::RGADoriginatorLookup($thisfile_riff_raw_rgad_track['originator']);
						$thisfile_riff['rgad']['track']['adjustment']      = getid3_lib::RGADadjustmentLookup($thisfile_riff_raw_rgad_track['adjustment'], $thisfile_riff_raw_rgad_track['signbit']);
					}
					if (($thisfile_riff_raw_rgad_album['name'] != 0) && ($thisfile_riff_raw_rgad_album['originator'] != 0)) {
						$thisfile_riff['rgad']['album']['name']       = getid3_lib::RGADnameLookup($thisfile_riff_raw_rgad_album['name']);
						$thisfile_riff['rgad']['album']['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_riff_raw_rgad_album['originator']);
						$thisfile_riff['rgad']['album']['adjustment'] = getid3_lib::RGADadjustmentLookup($thisfile_riff_raw_rgad_album['adjustment'], $thisfile_riff_raw_rgad_album['signbit']);
					}
				}

				if (isset($thisfile_riff_WAVE['fact'][0]['data'])) {
					$thisfile_riff_raw['fact']['NumberOfSamples'] = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($thisfile_riff_WAVE['fact'][0]['data'], 0, 4));

					// This should be a good way of calculating exact playtime,
					// but some sample files have had incorrect number of samples,
					// so cannot use this method

					// if (!empty($thisfile_riff_raw['fmt ']['nSamplesPerSec'])) {
					//     $ThisFileInfo['playtime_seconds'] = (float) $thisfile_riff_raw['fact']['NumberOfSamples'] / $thisfile_riff_raw['fmt ']['nSamplesPerSec'];
					// }
				}
				if (!empty($thisfile_riff_raw['fmt ']['nAvgBytesPerSec'])) {
					$thisfile_audio['bitrate'] = getid3_lib::CastAsInt($thisfile_riff_raw['fmt ']['nAvgBytesPerSec'] * 8);
				}

				if (isset($thisfile_riff_WAVE['bext'][0]['data'])) {
					// shortcut
					$thisfile_riff_WAVE_bext_0 = &$thisfile_riff_WAVE['bext'][0];

					$thisfile_riff_WAVE_bext_0['title']          =                         trim(substr($thisfile_riff_WAVE_bext_0['data'],   0, 256));
					$thisfile_riff_WAVE_bext_0['author']         =                         trim(substr($thisfile_riff_WAVE_bext_0['data'], 256,  32));
					$thisfile_riff_WAVE_bext_0['reference']      =                         trim(substr($thisfile_riff_WAVE_bext_0['data'], 288,  32));
					$thisfile_riff_WAVE_bext_0['origin_date']    =                              substr($thisfile_riff_WAVE_bext_0['data'], 320,  10);
					$thisfile_riff_WAVE_bext_0['origin_time']    =                              substr($thisfile_riff_WAVE_bext_0['data'], 330,   8);
					$thisfile_riff_WAVE_bext_0['time_reference'] = getid3_lib::LittleEndian2Int(substr($thisfile_riff_WAVE_bext_0['data'], 338,   8));
					$thisfile_riff_WAVE_bext_0['bwf_version']    = getid3_lib::LittleEndian2Int(substr($thisfile_riff_WAVE_bext_0['data'], 346,   1));
					$thisfile_riff_WAVE_bext_0['reserved']       = getid3_lib::LittleEndian2Int(substr($thisfile_riff_WAVE_bext_0['data'], 347, 254));
					$thisfile_riff_WAVE_bext_0['coding_history'] =         explode("\r\n", trim(substr($thisfile_riff_WAVE_bext_0['data'], 601)));

					$thisfile_riff_WAVE_bext_0['origin_date_unix'] = gmmktime(
																				substr($thisfile_riff_WAVE_bext_0['origin_time'], 0, 2),
																				substr($thisfile_riff_WAVE_bext_0['origin_time'], 3, 2),
																				substr($thisfile_riff_WAVE_bext_0['origin_time'], 6, 2),
																				substr($thisfile_riff_WAVE_bext_0['origin_date'], 5, 2),
																				substr($thisfile_riff_WAVE_bext_0['origin_date'], 8, 2),
																				substr($thisfile_riff_WAVE_bext_0['origin_date'], 0, 4));

					$thisfile_riff['comments']['author'][] = $thisfile_riff_WAVE_bext_0['author'];
					$thisfile_riff['comments']['title'][]  = $thisfile_riff_WAVE_bext_0['title'];
				}

				if (isset($thisfile_riff_WAVE['MEXT'][0]['data'])) {
					// shortcut
					$thisfile_riff_WAVE_MEXT_0 = &$thisfile_riff_WAVE['MEXT'][0];

					$thisfile_riff_WAVE_MEXT_0['raw']['sound_information']      = getid3_lib::LittleEndian2Int(substr($thisfile_riff_WAVE_MEXT_0['data'], 0, 2));
					$thisfile_riff_WAVE_MEXT_0['flags']['homogenous']           = (bool) ($thisfile_riff_WAVE_MEXT_0['raw']['sound_information'] & 0x0001);
					if ($thisfile_riff_WAVE_MEXT_0['flags']['homogenous']) {
						$thisfile_riff_WAVE_MEXT_0['flags']['padding']          = ($thisfile_riff_WAVE_MEXT_0['raw']['sound_information'] & 0x0002) ? false : true;
						$thisfile_riff_WAVE_MEXT_0['flags']['22_or_44']         =        (bool) ($thisfile_riff_WAVE_MEXT_0['raw']['sound_information'] & 0x0004);
						$thisfile_riff_WAVE_MEXT_0['flags']['free_format']      =        (bool) ($thisfile_riff_WAVE_MEXT_0['raw']['sound_information'] & 0x0008);

						$thisfile_riff_WAVE_MEXT_0['nominal_frame_size']        = getid3_lib::LittleEndian2Int(substr($thisfile_riff_WAVE_MEXT_0['data'], 2, 2));
					}
					$thisfile_riff_WAVE_MEXT_0['anciliary_data_length']         = getid3_lib::LittleEndian2Int(substr($thisfile_riff_WAVE_MEXT_0['data'], 6, 2));
					$thisfile_riff_WAVE_MEXT_0['raw']['anciliary_data_def']     = getid3_lib::LittleEndian2Int(substr($thisfile_riff_WAVE_MEXT_0['data'], 8, 2));
					$thisfile_riff_WAVE_MEXT_0['flags']['anciliary_data_left']  = (bool) ($thisfile_riff_WAVE_MEXT_0['raw']['anciliary_data_def'] & 0x0001);
					$thisfile_riff_WAVE_MEXT_0['flags']['anciliary_data_free']  = (bool) ($thisfile_riff_WAVE_MEXT_0['raw']['anciliary_data_def'] & 0x0002);
					$thisfile_riff_WAVE_MEXT_0['flags']['anciliary_data_right'] = (bool) ($thisfile_riff_WAVE_MEXT_0['raw']['anciliary_data_def'] & 0x0004);
				}

				if (isset($thisfile_riff_WAVE['cart'][0]['data'])) {
					// shortcut
					$thisfile_riff_WAVE_cart_0 = &$thisfile_riff_WAVE['cart'][0];