getid3_ogg

22class getid3_ogg extends getid3_handler23{24	/**25	 * @link http://xiph.org/vorbis/doc/Vorbis_I_spec.html26	 *27	 * @return bool28	 */29	public function Analyze() {30		$info = &$this->getid3->info;31 32		$info['fileformat'] = 'ogg';33 34		// Warn about illegal tags - only vorbiscomments are allowed35		if (isset($info['id3v2'])) {36			$this->warning('Illegal ID3v2 tag present.');37		}38		if (isset($info['id3v1'])) {39			$this->warning('Illegal ID3v1 tag present.');40		}41		if (isset($info['ape'])) {42			$this->warning('Illegal APE tag present.');43		}44 45 46		// Page 1 - Stream Header47 48		$this->fseek($info['avdataoffset']);49 50		$oggpageinfo = $this->ParseOggPageHeader();51		$info['ogg']['pageheader'][$oggpageinfo['page_seqno']] = $oggpageinfo;52 53		if ($this->ftell() >= $this->getid3->fread_buffer_size()) {54			$this->error('Could not find start of Ogg page in the first '.$this->getid3->fread_buffer_size().' bytes (this might not be an Ogg-Vorbis file?)');55			unset($info['fileformat']);56			unset($info['ogg']);57			return false;58		}59 60		$filedata = $this->fread($oggpageinfo['page_length']);61		$filedataoffset = 0;62 63		if (substr($filedata, 0, 4) == 'fLaC') {64 65			$info['audio']['dataformat']   = 'flac';66			$info['audio']['bitrate_mode'] = 'vbr';67			$info['audio']['lossless']     = true;68 69		} elseif (substr($filedata, 1, 6) == 'vorbis') {70 71			$this->ParseVorbisPageHeader($filedata, $filedataoffset, $oggpageinfo);72 73		} elseif (substr($filedata, 0, 8) == 'OpusHead') {74 75			if ($this->ParseOpusPageHeader($filedata, $filedataoffset, $oggpageinfo) === false) {76				return false;77			}78 79		} elseif (substr($filedata, 0, 8) == 'Speex   ') {80 81			// http://www.speex.org/manual/node10.html82 83			$info['audio']['dataformat']   = 'speex';84			$info['mime_type']             = 'audio/speex';85			$info['audio']['bitrate_mode'] = 'abr';86			$info['audio']['lossless']     = false;87 88			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_string']           =                              substr($filedata, $filedataoffset, 8); // hard-coded to 'Speex   '89			$filedataoffset += 8;90			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_version']          =                              substr($filedata, $filedataoffset, 20);91			$filedataoffset += 20;92			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_version_id']       = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));93			$filedataoffset += 4;94			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['header_size']            = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));95			$filedataoffset += 4;96			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['rate']                   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));97			$filedataoffset += 4;98			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['mode']                   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));99			$filedataoffset += 4;100			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['mode_bitstream_version'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));101			$filedataoffset += 4;