getid3_riff

33class getid3_riff extends getid3_handler34{35	protected $container = 'riff'; // default36 37	/**38	 * @return bool39	 *40	 * @throws getid3_exception41	 */42	public function Analyze() {43		$info = &$this->getid3->info;44 45		// initialize these values to an empty array, otherwise they default to NULL46		// and you can't append array values to a NULL value47		$info['riff'] = array('raw'=>array());48 49		// Shortcuts50		$thisfile_riff             = &$info['riff'];51		$thisfile_riff_raw         = &$thisfile_riff['raw'];52		$thisfile_audio            = &$info['audio'];53		$thisfile_video            = &$info['video'];54		$thisfile_audio_dataformat = &$thisfile_audio['dataformat'];55		$thisfile_riff_audio       = &$thisfile_riff['audio'];56		$thisfile_riff_video       = &$thisfile_riff['video'];57		$thisfile_riff_WAVE        = array();58 59		$Original                 = array();60		$Original['avdataoffset'] = $info['avdataoffset'];61		$Original['avdataend']    = $info['avdataend'];62 63		$this->fseek($info['avdataoffset']);64		$RIFFheader = $this->fread(12);65		$offset = $this->ftell();66		$RIFFtype    = substr($RIFFheader, 0, 4);67		$RIFFsize    = substr($RIFFheader, 4, 4);68		$RIFFsubtype = substr($RIFFheader, 8, 4);69 70		if ($RIFFsize == "\x00\x00\x00\x00") {71			// https://github.com/JamesHeinrich/getID3/issues/46872			// may occur in streaming files where the data size is unknown73			$thisfile_riff['header_size'] = $info['avdataend'] - 8;74			$this->warning('RIFF size field is empty, assuming the correct value is filesize-8 ('.$thisfile_riff['header_size'].')');75		} else {76			$thisfile_riff['header_size'] = $this->EitherEndian2Int($RIFFsize);77		}78 79		switch ($RIFFtype) {80			case 'FORM':  // AIFF, AIFC81				//$info['fileformat']   = 'aiff';82				$this->container = 'aiff';83				$thisfile_riff[$RIFFsubtype]  = $this->ParseRIFF($offset, ($offset + $thisfile_riff['header_size'] - 4));84				break;85 86			case 'RIFF':  // AVI, WAV, etc87			case 'SDSS':  // SDSS is identical to RIFF, just renamed. Used by SmartSound QuickTracks (www.smartsound.com)88			case 'RMP3':  // RMP3 is identical to RIFF, just renamed. Used by [unknown program] when creating RIFF-MP3s89				//$info['fileformat']   = 'riff';90				$this->container = 'riff';91				if ($RIFFsubtype == 'RMP3') {92					// RMP3 is identical to WAVE, just renamed. Used by [unknown program] when creating RIFF-MP3s93					$RIFFsubtype = 'WAVE';94				}95				if ($RIFFsubtype != 'AMV ') {96					// AMV files are RIFF-AVI files with parts of the spec deliberately broken, such as chunk size fields hardcoded to zero (because players known in hardware that these fields are always a certain size97					// Handled separately in ParseRIFFAMV()98					$thisfile_riff[$RIFFsubtype]  = $this->ParseRIFF($offset, ($offset + $thisfile_riff['header_size'] - 4));99				}100				if (($info['avdataend'] - $info['filesize']) == 1) {101					// LiteWave appears to incorrectly *not* pad actual output file102					// to nearest WORD boundary so may appear to be short by one103					// byte, in which case - skip warning104					$info['avdataend'] = $info['filesize'];105				}106 107				$nextRIFFoffset = (int) $Original['avdataoffset'] + 8 + (int) $thisfile_riff['header_size']; // 8 = "RIFF" + 32-bit offset108				while ($nextRIFFoffset < min($info['filesize'], $info['avdataend'])) {109					try {110						$this->fseek($nextRIFFoffset);111					} catch (getid3_exception $e) {112						if ($e->getCode() == 10) {