From 45ee8db7fd22ff9c9fe200802ed4e179000a5bb4 Mon Sep 17 00:00:00 2001 From: TheTroll Date: Thu, 25 Feb 2010 15:51:44 +0100 Subject: Replaced mediainfo calls by getid3 --- getid3/module.audio-video.mpeg.php | 292 +++++++++++++++++++++++++++++++++++++ 1 file changed, 292 insertions(+) create mode 100644 getid3/module.audio-video.mpeg.php (limited to 'getid3/module.audio-video.mpeg.php') diff --git a/getid3/module.audio-video.mpeg.php b/getid3/module.audio-video.mpeg.php new file mode 100644 index 0000000..8f48784 --- /dev/null +++ b/getid3/module.audio-video.mpeg.php @@ -0,0 +1,292 @@ + // +// available at http://getid3.sourceforge.net // +// or http://www.getid3.org // +///////////////////////////////////////////////////////////////// +// See readme.txt for more details // +///////////////////////////////////////////////////////////////// +// // +// module.audio-video.mpeg.php // +// module for analyzing MPEG files // +// dependencies: module.audio.mp3.php // +// /// +///////////////////////////////////////////////////////////////// + +getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.mp3.php', __FILE__, true); + +define('GETID3_MPEG_VIDEO_PICTURE_START', "\x00\x00\x01\x00"); +define('GETID3_MPEG_VIDEO_USER_DATA_START', "\x00\x00\x01\xB2"); +define('GETID3_MPEG_VIDEO_SEQUENCE_HEADER', "\x00\x00\x01\xB3"); +define('GETID3_MPEG_VIDEO_SEQUENCE_ERROR', "\x00\x00\x01\xB4"); +define('GETID3_MPEG_VIDEO_EXTENSION_START', "\x00\x00\x01\xB5"); +define('GETID3_MPEG_VIDEO_SEQUENCE_END', "\x00\x00\x01\xB7"); +define('GETID3_MPEG_VIDEO_GROUP_START', "\x00\x00\x01\xB8"); +define('GETID3_MPEG_AUDIO_START', "\x00\x00\x01\xC0"); + + +class getid3_mpeg +{ + + function getid3_mpeg(&$fd, &$ThisFileInfo) { + if ($ThisFileInfo['avdataend'] <= $ThisFileInfo['avdataoffset']) { + $ThisFileInfo['error'][] = '"avdataend" ('.$ThisFileInfo['avdataend'].') is unexpectedly less-than-or-equal-to "avdataoffset" ('.$ThisFileInfo['avdataoffset'].')'; + return false; + } + $ThisFileInfo['fileformat'] = 'mpeg'; + fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); + $MPEGstreamData = fread($fd, min(100000, $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])); + $MPEGstreamDataLength = strlen($MPEGstreamData); + + $foundVideo = true; + $VideoChunkOffset = 0; + while (substr($MPEGstreamData, $VideoChunkOffset++, 4) !== GETID3_MPEG_VIDEO_SEQUENCE_HEADER) { + if ($VideoChunkOffset >= $MPEGstreamDataLength) { + $foundVideo = false; + break; + } + } + if ($foundVideo) { + + // Start code 32 bits + // horizontal frame size 12 bits + // vertical frame size 12 bits + // pixel aspect ratio 4 bits + // frame rate 4 bits + // bitrate 18 bits + // marker bit 1 bit + // VBV buffer size 10 bits + // constrained parameter flag 1 bit + // intra quant. matrix flag 1 bit + // intra quant. matrix values 512 bits (present if matrix flag == 1) + // non-intra quant. matrix flag 1 bit + // non-intra quant. matrix values 512 bits (present if matrix flag == 1) + + $ThisFileInfo['video']['dataformat'] = 'mpeg'; + + $VideoChunkOffset += (strlen(GETID3_MPEG_VIDEO_SEQUENCE_HEADER) - 1); + + $FrameSizeDWORD = getid3_lib::BigEndian2Int(substr($MPEGstreamData, $VideoChunkOffset, 3)); + $VideoChunkOffset += 3; + + $AspectRatioFrameRateDWORD = getid3_lib::BigEndian2Int(substr($MPEGstreamData, $VideoChunkOffset, 1)); + $VideoChunkOffset += 1; + + $assortedinformation = getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $VideoChunkOffset, 4)); + $VideoChunkOffset += 4; + + $ThisFileInfo['mpeg']['video']['raw']['framesize_horizontal'] = ($FrameSizeDWORD & 0xFFF000) >> 12; // 12 bits for horizontal frame size + $ThisFileInfo['mpeg']['video']['raw']['framesize_vertical'] = ($FrameSizeDWORD & 0x000FFF); // 12 bits for vertical frame size + $ThisFileInfo['mpeg']['video']['raw']['pixel_aspect_ratio'] = ($AspectRatioFrameRateDWORD & 0xF0) >> 4; + $ThisFileInfo['mpeg']['video']['raw']['frame_rate'] = ($AspectRatioFrameRateDWORD & 0x0F); + + $ThisFileInfo['mpeg']['video']['framesize_horizontal'] = $ThisFileInfo['mpeg']['video']['raw']['framesize_horizontal']; + $ThisFileInfo['mpeg']['video']['framesize_vertical'] = $ThisFileInfo['mpeg']['video']['raw']['framesize_vertical']; + + $ThisFileInfo['mpeg']['video']['pixel_aspect_ratio'] = $this->MPEGvideoAspectRatioLookup($ThisFileInfo['mpeg']['video']['raw']['pixel_aspect_ratio']); + $ThisFileInfo['mpeg']['video']['pixel_aspect_ratio_text'] = $this->MPEGvideoAspectRatioTextLookup($ThisFileInfo['mpeg']['video']['raw']['pixel_aspect_ratio']); + $ThisFileInfo['mpeg']['video']['frame_rate'] = $this->MPEGvideoFramerateLookup($ThisFileInfo['mpeg']['video']['raw']['frame_rate']); + + $ThisFileInfo['mpeg']['video']['raw']['bitrate'] = getid3_lib::Bin2Dec(substr($assortedinformation, 0, 18)); + $ThisFileInfo['mpeg']['video']['raw']['marker_bit'] = (bool) getid3_lib::Bin2Dec(substr($assortedinformation, 18, 1)); + $ThisFileInfo['mpeg']['video']['raw']['vbv_buffer_size'] = getid3_lib::Bin2Dec(substr($assortedinformation, 19, 10)); + $ThisFileInfo['mpeg']['video']['raw']['constrained_param_flag'] = (bool) getid3_lib::Bin2Dec(substr($assortedinformation, 29, 1)); + $ThisFileInfo['mpeg']['video']['raw']['intra_quant_flag'] = (bool) getid3_lib::Bin2Dec(substr($assortedinformation, 30, 1)); + if ($ThisFileInfo['mpeg']['video']['raw']['intra_quant_flag']) { + + // read 512 bits + $ThisFileInfo['mpeg']['video']['raw']['intra_quant'] = getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $VideoChunkOffset, 64)); + $VideoChunkOffset += 64; + + $ThisFileInfo['mpeg']['video']['raw']['non_intra_quant_flag'] = (bool) getid3_lib::Bin2Dec(substr($ThisFileInfo['mpeg']['video']['raw']['intra_quant'], 511, 1)); + $ThisFileInfo['mpeg']['video']['raw']['intra_quant'] = getid3_lib::Bin2Dec(substr($assortedinformation, 31, 1)).substr(getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $VideoChunkOffset, 64)), 0, 511); + + if ($ThisFileInfo['mpeg']['video']['raw']['non_intra_quant_flag']) { + $ThisFileInfo['mpeg']['video']['raw']['non_intra_quant'] = substr($MPEGstreamData, $VideoChunkOffset, 64); + $VideoChunkOffset += 64; + } + + } else { + + $ThisFileInfo['mpeg']['video']['raw']['non_intra_quant_flag'] = (bool) getid3_lib::Bin2Dec(substr($assortedinformation, 31, 1)); + if ($ThisFileInfo['mpeg']['video']['raw']['non_intra_quant_flag']) { + $ThisFileInfo['mpeg']['video']['raw']['non_intra_quant'] = substr($MPEGstreamData, $VideoChunkOffset, 64); + $VideoChunkOffset += 64; + } + + } + + if ($ThisFileInfo['mpeg']['video']['raw']['bitrate'] == 0x3FFFF) { // 18 set bits + + $ThisFileInfo['warning'][] = 'This version of getID3() ['.GETID3_VERSION.'] cannot determine average bitrate of VBR MPEG video files'; + $ThisFileInfo['mpeg']['video']['bitrate_mode'] = 'vbr'; + + } else { + + $ThisFileInfo['mpeg']['video']['bitrate'] = $ThisFileInfo['mpeg']['video']['raw']['bitrate'] * 400; + $ThisFileInfo['mpeg']['video']['bitrate_mode'] = 'cbr'; + $ThisFileInfo['video']['bitrate'] = $ThisFileInfo['mpeg']['video']['bitrate']; + + } + + $ThisFileInfo['video']['resolution_x'] = $ThisFileInfo['mpeg']['video']['framesize_horizontal']; + $ThisFileInfo['video']['resolution_y'] = $ThisFileInfo['mpeg']['video']['framesize_vertical']; + $ThisFileInfo['video']['frame_rate'] = $ThisFileInfo['mpeg']['video']['frame_rate']; + $ThisFileInfo['video']['bitrate_mode'] = $ThisFileInfo['mpeg']['video']['bitrate_mode']; + $ThisFileInfo['video']['pixel_aspect_ratio'] = $ThisFileInfo['mpeg']['video']['pixel_aspect_ratio']; + $ThisFileInfo['video']['lossless'] = false; + $ThisFileInfo['video']['bits_per_sample'] = 24; + + } else { + + $ThisFileInfo['error'][] = 'Could not find start of video block in the first 100,000 bytes (or before end of file) - this might not be an MPEG-video file?'; + + } + + //0x000001B3 begins the sequence_header of every MPEG video stream. + //But in MPEG-2, this header must immediately be followed by an + //extension_start_code (0x000001B5) with a sequence_extension ID (1). + //(This extension contains all the additional MPEG-2 stuff.) + //MPEG-1 doesn't have this extension, so that's a sure way to tell the + //difference between MPEG-1 and MPEG-2 video streams. + + if (substr($MPEGstreamData, $VideoChunkOffset, 4) == GETID3_MPEG_VIDEO_EXTENSION_START) { + $ThisFileInfo['video']['codec'] = 'MPEG-2'; + } else { + $ThisFileInfo['video']['codec'] = 'MPEG-1'; + } + + + $AudioChunkOffset = 0; + while (true) { + while (substr($MPEGstreamData, $AudioChunkOffset++, 4) !== GETID3_MPEG_AUDIO_START) { + if ($AudioChunkOffset >= $MPEGstreamDataLength) { + break 2; + } + } + + for ($i = 0; $i <= 7; $i++) { + // some files have the MPEG-audio header 8 bytes after the end of the $00 $00 $01 $C0 signature, some have it up to 13 bytes (or more?) after + // I have no idea why or what the difference is, so this is a stupid hack. + // If anybody has any better idea of what's going on, please let me know - info@getid3.org + + $dummy = $ThisFileInfo; + if (getid3_mp3::decodeMPEGaudioHeader($fd, ($AudioChunkOffset + 3) + 8 + $i, $dummy, false)) { + $ThisFileInfo = $dummy; + $ThisFileInfo['audio']['bitrate_mode'] = 'cbr'; + $ThisFileInfo['audio']['lossless'] = false; + break 2; + + } + } + } + + // Temporary hack to account for interleaving overhead: + if (!empty($ThisFileInfo['video']['bitrate']) && !empty($ThisFileInfo['audio']['bitrate'])) { + $ThisFileInfo['playtime_seconds'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / ($ThisFileInfo['video']['bitrate'] + $ThisFileInfo['audio']['bitrate']); + + // Interleaved MPEG audio/video files have a certain amount of overhead that varies + // by both video and audio bitrates, and not in any sensible, linear/logarithmic patter + // Use interpolated lookup tables to approximately guess how much is overhead, because + // playtime is calculated as filesize / total-bitrate + $ThisFileInfo['playtime_seconds'] *= $this->MPEGsystemNonOverheadPercentage($ThisFileInfo['video']['bitrate'], $ThisFileInfo['audio']['bitrate']); + + //switch ($ThisFileInfo['video']['bitrate']) { + // case('5000000'): + // $multiplier = 0.93292642112380355828048824319889; + // break; + // case('5500000'): + // $multiplier = 0.93582895375200989965359777343219; + // break; + // case('6000000'): + // $multiplier = 0.93796247714820932532911373859139; + // break; + // case('7000000'): + // $multiplier = 0.9413264083635103463010117778776; + // break; + // default: + // $multiplier = 1; + // break; + //} + //$ThisFileInfo['playtime_seconds'] *= $multiplier; + //$ThisFileInfo['warning'][] = 'Interleaved MPEG audio/video playtime may be inaccurate. With current hack should be within a few seconds of accurate. Report to info@getid3.org if off by more than 10 seconds.'; + if ($ThisFileInfo['video']['bitrate'] < 50000) { + $ThisFileInfo['warning'][] = 'Interleaved MPEG audio/video playtime may be slightly inaccurate for video bitrates below 100kbps. Except in extreme low-bitrate situations, error should be less than 1%. Report to info@getid3.org if greater than this.'; + } + } + + return true; + } + + + function MPEGsystemNonOverheadPercentage($VideoBitrate, $AudioBitrate) { + $OverheadPercentage = 0; + + $AudioBitrate = max(min($AudioBitrate / 1000, 384), 32); // limit to range of 32kbps - 384kbps (should be only legal bitrates, but maybe VBR?) + $VideoBitrate = max(min($VideoBitrate / 1000, 10000), 10); // limit to range of 10kbps - 10Mbps (beyond that curves flatten anyways, no big loss) + + + //OMBB[audiobitrate] = array(video-10kbps, video-100kbps, video-1000kbps, video-10000kbps) + $OverheadMultiplierByBitrate[32] = array(0, 0.9676287944368530, 0.9802276264360310, 0.9844916183244460, 0.9852821845179940); + $OverheadMultiplierByBitrate[48] = array(0, 0.9779100089209830, 0.9787770035359320, 0.9846738664076130, 0.9852683013799960); + $OverheadMultiplierByBitrate[56] = array(0, 0.9731249855367600, 0.9776624308938040, 0.9832606361852130, 0.9843922606633340); + $OverheadMultiplierByBitrate[64] = array(0, 0.9755642683275760, 0.9795256705493390, 0.9836573009193170, 0.9851122539404470); + $OverheadMultiplierByBitrate[96] = array(0, 0.9788025247497290, 0.9798553314148700, 0.9822956869792560, 0.9834815119124690); + $OverheadMultiplierByBitrate[128] = array(0, 0.9816940050925480, 0.9821675936072120, 0.9829756927470870, 0.9839763420152050); + $OverheadMultiplierByBitrate[160] = array(0, 0.9825894094561180, 0.9820913399073960, 0.9823907143253970, 0.9832821783651570); + $OverheadMultiplierByBitrate[192] = array(0, 0.9832038474336260, 0.9825731694317960, 0.9821028622712400, 0.9828262076447620); + $OverheadMultiplierByBitrate[224] = array(0, 0.9836516298538770, 0.9824718601823890, 0.9818302180625380, 0.9823735101626480); + $OverheadMultiplierByBitrate[256] = array(0, 0.9845863022094920, 0.9837229411967540, 0.9824521662210830, 0.9828645172100790); + $OverheadMultiplierByBitrate[320] = array(0, 0.9849565280263180, 0.9837683142805110, 0.9822885275960400, 0.9824424382727190); + $OverheadMultiplierByBitrate[384] = array(0, 0.9856094774357600, 0.9844573394432720, 0.9825970399837330, 0.9824673808303890); + + $BitrateToUseMin = 32; + $BitrateToUseMax = 32; + $previousBitrate = 32; + foreach ($OverheadMultiplierByBitrate as $key => $value) { + if ($AudioBitrate >= $previousBitrate) { + $BitrateToUseMin = $previousBitrate; + } + if ($AudioBitrate < $key) { + $BitrateToUseMax = $key; + break; + } + $previousBitrate = $key; + } + $FactorA = ($BitrateToUseMax - $AudioBitrate) / ($BitrateToUseMax - $BitrateToUseMin); + + $VideoBitrateLog10 = log10($VideoBitrate); + $VideoFactorMin1 = $OverheadMultiplierByBitrate[$BitrateToUseMin][floor($VideoBitrateLog10)]; + $VideoFactorMin2 = $OverheadMultiplierByBitrate[$BitrateToUseMax][floor($VideoBitrateLog10)]; + $VideoFactorMax1 = $OverheadMultiplierByBitrate[$BitrateToUseMin][ceil($VideoBitrateLog10)]; + $VideoFactorMax2 = $OverheadMultiplierByBitrate[$BitrateToUseMax][ceil($VideoBitrateLog10)]; + $FactorV = $VideoBitrateLog10 - floor($VideoBitrateLog10); + + $OverheadPercentage = $VideoFactorMin1 * $FactorA * $FactorV; + $OverheadPercentage += $VideoFactorMin2 * (1 - $FactorA) * $FactorV; + $OverheadPercentage += $VideoFactorMax1 * $FactorA * (1 - $FactorV); + $OverheadPercentage += $VideoFactorMax2 * (1 - $FactorA) * (1 - $FactorV); + + return $OverheadPercentage; + } + + + function MPEGvideoFramerateLookup($rawframerate) { + $MPEGvideoFramerateLookup = array(0, 23.976, 24, 25, 29.97, 30, 50, 59.94, 60); + return (isset($MPEGvideoFramerateLookup[$rawframerate]) ? (float) $MPEGvideoFramerateLookup[$rawframerate] : (float) 0); + } + + function MPEGvideoAspectRatioLookup($rawaspectratio) { + $MPEGvideoAspectRatioLookup = array(0, 1, 0.6735, 0.7031, 0.7615, 0.8055, 0.8437, 0.8935, 0.9157, 0.9815, 1.0255, 1.0695, 1.0950, 1.1575, 1.2015, 0); + return (isset($MPEGvideoAspectRatioLookup[$rawaspectratio]) ? (float) $MPEGvideoAspectRatioLookup[$rawaspectratio] : (float) 0); + } + + function MPEGvideoAspectRatioTextLookup($rawaspectratio) { + $MPEGvideoAspectRatioTextLookup = array('forbidden', 'square pixels', '0.6735', '16:9, 625 line, PAL', '0.7615', '0.8055', '16:9, 525 line, NTSC', '0.8935', '4:3, 625 line, PAL, CCIR601', '0.9815', '1.0255', '1.0695', '4:3, 525 line, NTSC, CCIR601', '1.1575', '1.2015', 'reserved'); + return (isset($MPEGvideoAspectRatioTextLookup[$rawaspectratio]) ? $MPEGvideoAspectRatioTextLookup[$rawaspectratio] : ''); + } + +} + + +?> \ No newline at end of file -- cgit v1.2.3