module.audio.ogg.php

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<?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.ogg.php                                        //
// module for analyzing Ogg Vorbis, OggFLAC and Speex files    //
// dependencies: module.audio.flac.php                         //
//                                                            ///
/////////////////////////////////////////////////////////////////

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

class getid3_ogg
{

	function getid3_ogg(&$fd, &$ThisFileInfo) {

		$ThisFileInfo['fileformat'] = 'ogg';

		// Warn about illegal tags - only vorbiscomments are allowed
		if (isset($ThisFileInfo['id3v2'])) {
			$ThisFileInfo['warning'][] = 'Illegal ID3v2 tag present.';
		}
		if (isset($ThisFileInfo['id3v1'])) {
			$ThisFileInfo['warning'][] = 'Illegal ID3v1 tag present.';
		}
		if (isset($ThisFileInfo['ape'])) {
			$ThisFileInfo['warning'][] = 'Illegal APE tag present.';
		}


		// Page 1 - Stream Header

		fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);

		$oggpageinfo = getid3_ogg::ParseOggPageHeader($fd);
		$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']] = $oggpageinfo;

		if (ftell($fd) >= GETID3_FREAD_BUFFER_SIZE) {
			$ThisFileInfo['error'][] = 'Could not find start of Ogg page in the first '.GETID3_FREAD_BUFFER_SIZE.' bytes (this might not be an Ogg-Vorbis file?)';
			unset($ThisFileInfo['fileformat']);
			unset($ThisFileInfo['ogg']);
			return false;
		}

		$filedata = fread($fd, $oggpageinfo['page_length']);
		$filedataoffset = 0;

		if (substr($filedata, 0, 4) == 'fLaC') {

			$ThisFileInfo['audio']['dataformat']   = 'flac';
			$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
			$ThisFileInfo['audio']['lossless']     = true;

		} elseif (substr($filedata, 1, 6) == 'vorbis') {

			$ThisFileInfo['audio']['dataformat'] = 'vorbis';
			$ThisFileInfo['audio']['lossless']   = false;

			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['packet_type'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
			$filedataoffset += 1;
			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['stream_type'] = substr($filedata, $filedataoffset, 6); // hard-coded to 'vorbis'
			$filedataoffset += 6;
			$ThisFileInfo['ogg']['bitstreamversion'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$ThisFileInfo['ogg']['numberofchannels'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
			$filedataoffset += 1;
			$ThisFileInfo['audio']['channels']                = $ThisFileInfo['ogg']['numberofchannels'];
			$ThisFileInfo['ogg']['samplerate']       = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			if ($ThisFileInfo['ogg']['samplerate'] == 0) {
				$ThisFileInfo['error'][] = 'Corrupt Ogg file: sample rate == zero';
				return false;
			}
			$ThisFileInfo['audio']['sample_rate']               = $ThisFileInfo['ogg']['samplerate'];
			$ThisFileInfo['ogg']['samples']          = 0; // filled in later
			$ThisFileInfo['ogg']['bitrate_average']  = 0; // filled in later
			$ThisFileInfo['ogg']['bitrate_max']      = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$ThisFileInfo['ogg']['bitrate_nominal']  = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$ThisFileInfo['ogg']['bitrate_min']      = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$ThisFileInfo['ogg']['blocksize_small']  = pow(2,  getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)) & 0x0F);
			$ThisFileInfo['ogg']['blocksize_large']  = pow(2, (getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)) & 0xF0) >> 4);
			$ThisFileInfo['ogg']['stop_bit']         = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)); // must be 1, marks end of packet

			$ThisFileInfo['audio']['bitrate_mode'] = 'vbr'; // overridden if actually abr
			if ($ThisFileInfo['ogg']['bitrate_max'] == 0xFFFFFFFF) {
				unset($ThisFileInfo['ogg']['bitrate_max']);
				$ThisFileInfo['audio']['bitrate_mode'] = 'abr';
			}
			if ($ThisFileInfo['ogg']['bitrate_nominal'] == 0xFFFFFFFF) {
				unset($ThisFileInfo['ogg']['bitrate_nominal']);
			}
			if ($ThisFileInfo['ogg']['bitrate_min'] == 0xFFFFFFFF) {
				unset($ThisFileInfo['ogg']['bitrate_min']);
				$ThisFileInfo['audio']['bitrate_mode'] = 'abr';
			}

		} elseif (substr($filedata, 0, 8) == 'Speex   ') {

			// http://www.speex.org/manual/node10.html

			$ThisFileInfo['audio']['dataformat']   = 'speex';
			$ThisFileInfo['mime_type']             = 'audio/speex';
			$ThisFileInfo['audio']['bitrate_mode'] = 'abr';
			$ThisFileInfo['audio']['lossless']     = false;

			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_string']           =                  substr($filedata, $filedataoffset, 8); // hard-coded to 'Speex   '
			$filedataoffset += 8;
			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_version']          =                  substr($filedata, $filedataoffset, 20);
			$filedataoffset += 20;
			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_version_id']       = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['header_size']            = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['rate']                   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['mode']                   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['mode_bitstream_version'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['nb_channels']            = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['bitrate']                = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['framesize']              = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['vbr']                    = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['frames_per_packet']      = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['extra_headers']          = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['reserved1']              = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['reserved2']              = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;

			$ThisFileInfo['speex']['speex_version'] = trim($ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_version']);
			$ThisFileInfo['speex']['sample_rate']   = $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['rate'];
			$ThisFileInfo['speex']['channels']      = $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['nb_channels'];
			$ThisFileInfo['speex']['vbr']           = (bool) $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['vbr'];
			$ThisFileInfo['speex']['band_type']     = getid3_ogg::SpeexBandModeLookup($ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['mode']);

			$ThisFileInfo['audio']['sample_rate']   = $ThisFileInfo['speex']['sample_rate'];
			$ThisFileInfo['audio']['channels']      = $ThisFileInfo['speex']['channels'];
			if ($ThisFileInfo['speex']['vbr']) {
				$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
			}

		} else {

			$ThisFileInfo['error'][] = 'Expecting either "Speex   " or "vorbis" identifier strings, found neither';
			unset($ThisFileInfo['ogg']);
			unset($ThisFileInfo['mime_type']);
			return false;

		}


		// Page 2 - Comment Header

		$oggpageinfo = getid3_ogg::ParseOggPageHeader($fd);
		$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']] = $oggpageinfo;

		switch ($ThisFileInfo['audio']['dataformat']) {

			case 'vorbis':
				$filedata = fread($fd, $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_length']);
				$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['packet_type'] = getid3_lib::LittleEndian2Int(substr($filedata, 0, 1));
				$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['stream_type'] =                  substr($filedata, 1, 6); // hard-coded to 'vorbis'

				getid3_ogg::ParseVorbisCommentsFilepointer($fd, $ThisFileInfo);
				break;

			case 'flac':
				if (!getid3_flac::FLACparseMETAdata($fd, $ThisFileInfo)) {
					$ThisFileInfo['error'][] = 'Failed to parse FLAC headers';
					return false;
				}
				break;

			case 'speex':
				fseek($fd, $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_length'], SEEK_CUR);
				getid3_ogg::ParseVorbisCommentsFilepointer($fd, $ThisFileInfo);
				break;

		}



		// Last Page - Number of Samples

		fseek($fd, max($ThisFileInfo['avdataend'] - GETID3_FREAD_BUFFER_SIZE, 0), SEEK_SET);
		$LastChunkOfOgg = strrev(fread($fd, GETID3_FREAD_BUFFER_SIZE));
		if ($LastOggSpostion = strpos($LastChunkOfOgg, 'SggO')) {
			fseek($fd, $ThisFileInfo['avdataend'] - ($LastOggSpostion + strlen('SggO')), SEEK_SET);
			$ThisFileInfo['avdataend'] = ftell($fd);
			$ThisFileInfo['ogg']['pageheader']['eos'] = getid3_ogg::ParseOggPageHeader($fd);
			$ThisFileInfo['ogg']['samples']   = $ThisFileInfo['ogg']['pageheader']['eos']['pcm_abs_position'];
			if ($ThisFileInfo['ogg']['samples'] == 0) {
				$ThisFileInfo['error'][] = 'Corrupt Ogg file: eos.number of samples == zero';
				return false;
			}
			$ThisFileInfo['ogg']['bitrate_average'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / ($ThisFileInfo['ogg']['samples'] / $ThisFileInfo['audio']['sample_rate']);
		}

		if (!empty($ThisFileInfo['ogg']['bitrate_average'])) {
			$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['ogg']['bitrate_average'];
		} elseif (!empty($ThisFileInfo['ogg']['bitrate_nominal'])) {
			$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['ogg']['bitrate_nominal'];
		} elseif (!empty($ThisFileInfo['ogg']['bitrate_min']) && !empty($ThisFileInfo['ogg']['bitrate_max'])) {
			$ThisFileInfo['audio']['bitrate'] = ($ThisFileInfo['ogg']['bitrate_min'] + $ThisFileInfo['ogg']['bitrate_max']) / 2;
		}
		if (isset($ThisFileInfo['audio']['bitrate']) && !isset($ThisFileInfo['playtime_seconds'])) {
			if ($ThisFileInfo['audio']['bitrate'] == 0) {
				$ThisFileInfo['error'][] = 'Corrupt Ogg file: bitrate_audio == zero';
				return false;
			}
			$ThisFileInfo['playtime_seconds'] = (float) ((($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['audio']['bitrate']);
		}

		if (isset($ThisFileInfo['ogg']['vendor'])) {
			$ThisFileInfo['audio']['encoder'] = preg_replace('/^Encoded with /', '', $ThisFileInfo['ogg']['vendor']);

			// Vorbis only
			if ($ThisFileInfo['audio']['dataformat'] == 'vorbis') {

				// Vorbis 1.0 starts with Xiph.Org
				if  (preg_match('/^Xiph.Org/', $ThisFileInfo['audio']['encoder'])) {

					if ($ThisFileInfo['audio']['bitrate_mode'] == 'abr') {

						// Set -b 128 on abr files
						$ThisFileInfo['audio']['encoder_options'] = '-b '.round($ThisFileInfo['ogg']['bitrate_nominal'] / 1000);

					} elseif (($ThisFileInfo['audio']['bitrate_mode'] == 'vbr') && ($ThisFileInfo['audio']['channels'] == 2) && ($ThisFileInfo['audio']['sample_rate'] >= 44100) && ($ThisFileInfo['audio']['sample_rate'] <= 48000)) {
						// Set -q N on vbr files
						$ThisFileInfo['audio']['encoder_options'] = '-q '.$this->get_quality_from_nominal_bitrate($ThisFileInfo['ogg']['bitrate_nominal']);

					}
				}

				if (empty($ThisFileInfo['audio']['encoder_options']) && !empty($ThisFileInfo['ogg']['bitrate_nominal'])) {
					$ThisFileInfo['audio']['encoder_options'] = 'Nominal bitrate: '.intval(round($ThisFileInfo['ogg']['bitrate_nominal'] / 1000)).'kbps';
				}
			}
		}

		return true;
	}


	function ParseOggPageHeader(&$fd) {
		// http://xiph.org/ogg/vorbis/doc/framing.html
		$oggheader['page_start_offset'] = ftell($fd); // where we started from in the file

		$filedata = fread($fd, GETID3_FREAD_BUFFER_SIZE);
		$filedataoffset = 0;
		while ((substr($filedata, $filedataoffset++, 4) != 'OggS')) {
			if ((ftell($fd) - $oggheader['page_start_offset']) >= GETID3_FREAD_BUFFER_SIZE) {
				// should be found before here
				return false;
			}
			if ((($filedataoffset + 28) > strlen($filedata)) || (strlen($filedata) < 28)) {