Mercurial > judyates
diff e2gallerypro/e2upload/Backend/Assets/getid3/module.audio-video.mpeg.php @ 3:3f6b44aa6b35 judyates
[svn r4] added ability to buy stuff, from a Prints page, but it doesn't work well with the css, and it also has not been fitted into the perl make system.
| author | rlm |
|---|---|
| date | Mon, 22 Feb 2010 08:02:39 -0500 |
| parents | |
| children |
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1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/e2gallerypro/e2upload/Backend/Assets/getid3/module.audio-video.mpeg.php Mon Feb 22 08:02:39 2010 -0500 1.3 @@ -0,0 +1,324 @@ 1.4 +<?php 1.5 +// +----------------------------------------------------------------------+ 1.6 +// | PHP version 5 | 1.7 +// +----------------------------------------------------------------------+ 1.8 +// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen | 1.9 +// +----------------------------------------------------------------------+ 1.10 +// | This source file is subject to version 2 of the GPL license, | 1.11 +// | that is bundled with this package in the file license.txt and is | 1.12 +// | available through the world-wide-web at the following url: | 1.13 +// | http://www.gnu.org/copyleft/gpl.html | 1.14 +// +----------------------------------------------------------------------+ 1.15 +// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org | 1.16 +// +----------------------------------------------------------------------+ 1.17 +// | Authors: James Heinrich <infoØgetid3*org> | 1.18 +// | Allan Hansen <ahØartemis*dk> | 1.19 +// +----------------------------------------------------------------------+ 1.20 +// | module.audio-video.mpeg.php | 1.21 +// | Module for analyzing MPEG files | 1.22 +// | dependencies: module.audio.mp3.php | 1.23 +// +----------------------------------------------------------------------+ 1.24 +// 1.25 +// $Id: module.audio-video.mpeg.php,v 1.3 2006/11/02 10:48:00 ah Exp $ 1.26 + 1.27 + 1.28 + 1.29 +class getid3_mpeg extends getid3_handler 1.30 +{ 1.31 + 1.32 + const VIDEO_PICTURE_START = "\x00\x00\x01\x00"; 1.33 + const VIDEO_USER_DATA_START = "\x00\x00\x01\xB2"; 1.34 + const VIDEO_SEQUENCE_HEADER = "\x00\x00\x01\xB3"; 1.35 + const VIDEO_SEQUENCE_ERROR = "\x00\x00\x01\xB4"; 1.36 + const VIDEO_EXTENSION_START = "\x00\x00\x01\xB5"; 1.37 + const VIDEO_SEQUENCE_END = "\x00\x00\x01\xB7"; 1.38 + const VIDEO_GROUP_START = "\x00\x00\x01\xB8"; 1.39 + const AUDIO_START = "\x00\x00\x01\xC0"; 1.40 + 1.41 + 1.42 + public function Analyze() { 1.43 + 1.44 + $getid3 = $this->getid3; 1.45 + 1.46 + $getid3->info['mpeg']['video']['raw'] = array (); 1.47 + $info_mpeg_video = &$getid3->info['mpeg']['video']; 1.48 + $info_mpeg_video_raw = &$info_mpeg_video['raw']; 1.49 + 1.50 + $getid3->info['video'] = array (); 1.51 + $info_video = &$getid3->info['video']; 1.52 + 1.53 + $getid3->include_module('audio.mp3'); 1.54 + 1.55 + if ($getid3->info['avdataend'] <= $getid3->info['avdataoffset']) { 1.56 + throw new getid3_exception('"avdataend" ('.$getid3->info['avdataend'].') is unexpectedly less-than-or-equal-to "avdataoffset" ('.$getid3->info['avdataoffset'].')'); 1.57 + } 1.58 + 1.59 + $getid3->info['fileformat'] = 'mpeg'; 1.60 + fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); 1.61 + $mpeg_stream_data = fread($getid3->fp, min(100000, $getid3->info['avdataend'] - $getid3->info['avdataoffset'])); 1.62 + $mpeg_stream_data_length = strlen($mpeg_stream_data); 1.63 + 1.64 + $video_chunk_offset = 0; 1.65 + while (substr($mpeg_stream_data, $video_chunk_offset++, 4) !== getid3_mpeg::VIDEO_SEQUENCE_HEADER) { 1.66 + if ($video_chunk_offset >= $mpeg_stream_data_length) { 1.67 + throw new getid3_exception('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?'); 1.68 + } 1.69 + } 1.70 + 1.71 + // Start code 32 bits 1.72 + // horizontal frame size 12 bits 1.73 + // vertical frame size 12 bits 1.74 + // pixel aspect ratio 4 bits 1.75 + // frame rate 4 bits 1.76 + // bitrate 18 bits 1.77 + // marker bit 1 bit 1.78 + // VBV buffer size 10 bits 1.79 + // constrained parameter flag 1 bit 1.80 + // intra quant. matrix flag 1 bit 1.81 + // intra quant. matrix values 512 bits (present if matrix flag == 1) 1.82 + // non-intra quant. matrix flag 1 bit 1.83 + // non-intra quant. matrix values 512 bits (present if matrix flag == 1) 1.84 + 1.85 + $info_video['dataformat'] = 'mpeg'; 1.86 + 1.87 + $video_chunk_offset += (strlen(getid3_mpeg::VIDEO_SEQUENCE_HEADER) - 1); 1.88 + 1.89 + $frame_size_dword = getid3_lib::BigEndian2Int(substr($mpeg_stream_data, $video_chunk_offset, 3)); 1.90 + $video_chunk_offset += 3; 1.91 + 1.92 + $aspect_ratio_frame_rate_dword = getid3_lib::BigEndian2Int(substr($mpeg_stream_data, $video_chunk_offset, 1)); 1.93 + $video_chunk_offset += 1; 1.94 + 1.95 + $assorted_information = getid3_lib::BigEndian2Bin(substr($mpeg_stream_data, $video_chunk_offset, 4)); 1.96 + $video_chunk_offset += 4; 1.97 + 1.98 + $info_mpeg_video_raw['framesize_horizontal'] = ($frame_size_dword & 0xFFF000) >> 12; // 12 bits for horizontal frame size 1.99 + $info_mpeg_video_raw['framesize_vertical'] = ($frame_size_dword & 0x000FFF); // 12 bits for vertical frame size 1.100 + $info_mpeg_video_raw['pixel_aspect_ratio'] = ($aspect_ratio_frame_rate_dword & 0xF0) >> 4; 1.101 + $info_mpeg_video_raw['frame_rate'] = ($aspect_ratio_frame_rate_dword & 0x0F); 1.102 + 1.103 + $info_mpeg_video['framesize_horizontal'] = $info_mpeg_video_raw['framesize_horizontal']; 1.104 + $info_mpeg_video['framesize_vertical'] = $info_mpeg_video_raw['framesize_vertical']; 1.105 + 1.106 + $info_mpeg_video['pixel_aspect_ratio'] = $this->MPEGvideoAspectRatioLookup($info_mpeg_video_raw['pixel_aspect_ratio']); 1.107 + $info_mpeg_video['pixel_aspect_ratio_text'] = $this->MPEGvideoAspectRatioTextLookup($info_mpeg_video_raw['pixel_aspect_ratio']); 1.108 + $info_mpeg_video['frame_rate'] = $this->MPEGvideoFramerateLookup($info_mpeg_video_raw['frame_rate']); 1.109 + 1.110 + $info_mpeg_video_raw['bitrate'] = bindec(substr($assorted_information, 0, 18)); 1.111 + $info_mpeg_video_raw['marker_bit'] = (bool)bindec($assorted_information{18}); 1.112 + $info_mpeg_video_raw['vbv_buffer_size'] = bindec(substr($assorted_information, 19, 10)); 1.113 + $info_mpeg_video_raw['constrained_param_flag'] = (bool)bindec($assorted_information{29}); 1.114 + $info_mpeg_video_raw['intra_quant_flag'] = (bool)bindec($assorted_information{30}); 1.115 + 1.116 + if ($info_mpeg_video_raw['intra_quant_flag']) { 1.117 + 1.118 + // read 512 bits 1.119 + $info_mpeg_video_raw['intra_quant'] = getid3_lib::BigEndian2Bin(substr($mpeg_stream_data, $video_chunk_offset, 64)); 1.120 + $video_chunk_offset += 64; 1.121 + 1.122 + $info_mpeg_video_raw['non_intra_quant_flag'] = (bool)bindec($info_mpeg_video_raw['intra_quant']{511}); 1.123 + $info_mpeg_video_raw['intra_quant'] = bindec($assorted_information{31}).substr(getid3_lib::BigEndian2Bin(substr($mpeg_stream_data, $video_chunk_offset, 64)), 0, 511); 1.124 + 1.125 + if ($info_mpeg_video_raw['non_intra_quant_flag']) { 1.126 + $info_mpeg_video_raw['non_intra_quant'] = substr($mpeg_stream_data, $video_chunk_offset, 64); 1.127 + $video_chunk_offset += 64; 1.128 + } 1.129 + 1.130 + } else { 1.131 + 1.132 + $info_mpeg_video_raw['non_intra_quant_flag'] = (bool)bindec($assorted_information{31}); 1.133 + if ($info_mpeg_video_raw['non_intra_quant_flag']) { 1.134 + $info_mpeg_video_raw['non_intra_quant'] = substr($mpeg_stream_data, $video_chunk_offset, 64); 1.135 + $video_chunk_offset += 64; 1.136 + } 1.137 + } 1.138 + 1.139 + if ($info_mpeg_video_raw['bitrate'] == 0x3FFFF) { // 18 set bits 1.140 + 1.141 + $getid3->warning('This version of getID3() cannot determine average bitrate of VBR MPEG video files'); 1.142 + $info_mpeg_video['bitrate_mode'] = 'vbr'; 1.143 + 1.144 + } else { 1.145 + 1.146 + $info_mpeg_video['bitrate'] = $info_mpeg_video_raw['bitrate'] * 400; 1.147 + $info_mpeg_video['bitrate_mode'] = 'cbr'; 1.148 + $info_video['bitrate'] = $info_mpeg_video['bitrate']; 1.149 + } 1.150 + 1.151 + $info_video['resolution_x'] = $info_mpeg_video['framesize_horizontal']; 1.152 + $info_video['resolution_y'] = $info_mpeg_video['framesize_vertical']; 1.153 + $info_video['frame_rate'] = $info_mpeg_video['frame_rate']; 1.154 + $info_video['bitrate_mode'] = $info_mpeg_video['bitrate_mode']; 1.155 + $info_video['pixel_aspect_ratio'] = $info_mpeg_video['pixel_aspect_ratio']; 1.156 + $info_video['lossless'] = false; 1.157 + $info_video['bits_per_sample'] = 24; 1.158 + 1.159 + 1.160 + //0x000001B3 begins the sequence_header of every MPEG video stream. 1.161 + //But in MPEG-2, this header must immediately be followed by an 1.162 + //extension_start_code (0x000001B5) with a sequence_extension ID (1). 1.163 + //(This extension contains all the additional MPEG-2 stuff.) 1.164 + //MPEG-1 doesn't have this extension, so that's a sure way to tell the 1.165 + //difference between MPEG-1 and MPEG-2 video streams. 1.166 + 1.167 + $info_video['codec'] = substr($mpeg_stream_data, $video_chunk_offset, 4) == getid3_mpeg::VIDEO_EXTENSION_START ? 'MPEG-2' : 'MPEG-1'; 1.168 + 1.169 + $audio_chunk_offset = 0; 1.170 + while (true) { 1.171 + while (substr($mpeg_stream_data, $audio_chunk_offset++, 4) !== getid3_mpeg::AUDIO_START) { 1.172 + if ($audio_chunk_offset >= $mpeg_stream_data_length) { 1.173 + break 2; 1.174 + } 1.175 + } 1.176 + 1.177 + for ($i = 0; $i <= 7; $i++) { 1.178 + // 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 1.179 + // I have no idea why or what the difference is, so this is a stupid hack. 1.180 + // If anybody has any better idea of what's going on, please let me know - info@getid3.org 1.181 + 1.182 + // make copy of info 1.183 + $dummy = $getid3->info; 1.184 + 1.185 + // clone getid3 - better safe than sorry 1.186 + $clone = clone $this->getid3; 1.187 + 1.188 + // check 1.189 + $mp3 = new getid3_mp3($clone); 1.190 + if ($mp3->decodeMPEGaudioHeader($getid3->fp, ($audio_chunk_offset + 3) + 8 + $i, $dummy, false)) { 1.191 + 1.192 + $getid3->info = $dummy; 1.193 + $getid3->info['audio']['bitrate_mode'] = 'cbr'; 1.194 + $getid3->info['audio']['lossless'] = false; 1.195 + break 2; 1.196 + } 1.197 + 1.198 + // destroy copy 1.199 + unset($dummy); 1.200 + } 1.201 + } 1.202 + 1.203 + // Temporary hack to account for interleaving overhead: 1.204 + if (!empty($info_video['bitrate']) && !empty($getid3->info['audio']['bitrate'])) { 1.205 + $getid3->info['playtime_seconds'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / ($info_video['bitrate'] + $getid3->info['audio']['bitrate']); 1.206 + 1.207 + // Interleaved MPEG audio/video files have a certain amount of overhead that varies 1.208 + // by both video and audio bitrates, and not in any sensible, linear/logarithmic patter 1.209 + // Use interpolated lookup tables to approximately guess how much is overhead, because 1.210 + // playtime is calculated as filesize / total-bitrate 1.211 + $getid3->info['playtime_seconds'] *= $this->MPEGsystemNonOverheadPercentage($info_video['bitrate'], $getid3->info['audio']['bitrate']); 1.212 + 1.213 + //switch ($info_video['bitrate']) { 1.214 + // case('5000000'): 1.215 + // $multiplier = 0.93292642112380355828048824319889; 1.216 + // break; 1.217 + // case('5500000'): 1.218 + // $multiplier = 0.93582895375200989965359777343219; 1.219 + // break; 1.220 + // case('6000000'): 1.221 + // $multiplier = 0.93796247714820932532911373859139; 1.222 + // break; 1.223 + // case('7000000'): 1.224 + // $multiplier = 0.9413264083635103463010117778776; 1.225 + // break; 1.226 + // default: 1.227 + // $multiplier = 1; 1.228 + // break; 1.229 + //} 1.230 + //$getid3->info['playtime_seconds'] *= $multiplier; 1.231 + //$getid3->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.'); 1.232 + 1.233 + if ($info_video['bitrate'] < 50000) { 1.234 + $getid3->warning('Interleaved MPEG audio/video playtime may be slightly inaccurate for video bitrates below 100kbps. Except in extreme low-bitrate situations, error should be less than 1%. Report to info@getid3.org if greater than this.'); 1.235 + } 1.236 + } 1.237 + 1.238 + return true; 1.239 + } 1.240 + 1.241 + 1.242 + 1.243 + public static function MPEGsystemNonOverheadPercentage($video_bitrate, $audio_bitrate) { 1.244 + 1.245 + $overhead_percentage = 0; 1.246 + 1.247 + $audio_bitrate = max(min($audio_bitrate / 1000, 384), 32); // limit to range of 32kbps - 384kbps (should be only legal bitrates, but maybe VBR?) 1.248 + $video_bitrate = max(min($video_bitrate / 1000, 10000), 10); // limit to range of 10kbps - 10Mbps (beyond that curves flatten anyways, no big loss) 1.249 + 1.250 + //OMBB[audiobitrate] = array ( video-10kbps, video-100kbps, video-1000kbps, video-10000kbps) 1.251 + static $overhead_multiplier_by_bitrate = array ( 1.252 + 32 => array (0, 0.9676287944368530, 0.9802276264360310, 0.9844916183244460, 0.9852821845179940), 1.253 + 48 => array (0, 0.9779100089209830, 0.9787770035359320, 0.9846738664076130, 0.9852683013799960), 1.254 + 56 => array (0, 0.9731249855367600, 0.9776624308938040, 0.9832606361852130, 0.9843922606633340), 1.255 + 64 => array (0, 0.9755642683275760, 0.9795256705493390, 0.9836573009193170, 0.9851122539404470), 1.256 + 96 => array (0, 0.9788025247497290, 0.9798553314148700, 0.9822956869792560, 0.9834815119124690), 1.257 + 128 => array (0, 0.9816940050925480, 0.9821675936072120, 0.9829756927470870, 0.9839763420152050), 1.258 + 160 => array (0, 0.9825894094561180, 0.9820913399073960, 0.9823907143253970, 0.9832821783651570), 1.259 + 192 => array (0, 0.9832038474336260, 0.9825731694317960, 0.9821028622712400, 0.9828262076447620), 1.260 + 224 => array (0, 0.9836516298538770, 0.9824718601823890, 0.9818302180625380, 0.9823735101626480), 1.261 + 256 => array (0, 0.9845863022094920, 0.9837229411967540, 0.9824521662210830, 0.9828645172100790), 1.262 + 320 => array (0, 0.9849565280263180, 0.9837683142805110, 0.9822885275960400, 0.9824424382727190), 1.263 + 384 => array (0, 0.9856094774357600, 0.9844573394432720, 0.9825970399837330, 0.9824673808303890) 1.264 + ); 1.265 + 1.266 + $bitrate_to_use_min = $bitrate_to_use_max = $previous_bitrate = 32; 1.267 + 1.268 + foreach ($overhead_multiplier_by_bitrate as $key => $value) { 1.269 + 1.270 + if ($audio_bitrate >= $previous_bitrate) { 1.271 + $bitrate_to_use_min = $previous_bitrate; 1.272 + } 1.273 + if ($audio_bitrate < $key) { 1.274 + $bitrate_to_use_max = $key; 1.275 + break; 1.276 + } 1.277 + $previous_bitrate = $key; 1.278 + } 1.279 + 1.280 + $factor_a = ($bitrate_to_use_max - $audio_bitrate) / ($bitrate_to_use_max - $bitrate_to_use_min); 1.281 + 1.282 + $video_bitrate_log10 = log10($video_bitrate); 1.283 + $video_factor_min1 = $overhead_multiplier_by_bitrate[$bitrate_to_use_min][floor($video_bitrate_log10)]; 1.284 + $video_factor_min2 = $overhead_multiplier_by_bitrate[$bitrate_to_use_max][floor($video_bitrate_log10)]; 1.285 + $video_factor_max1 = $overhead_multiplier_by_bitrate[$bitrate_to_use_min][ceil($video_bitrate_log10)]; 1.286 + $video_factor_max2 = $overhead_multiplier_by_bitrate[$bitrate_to_use_max][ceil($video_bitrate_log10)]; 1.287 + $factor_v = $video_bitrate_log10 - floor($video_bitrate_log10); 1.288 + 1.289 + $overhead_percentage = $video_factor_min1 * $factor_a * $factor_v; 1.290 + $overhead_percentage += $video_factor_min2 * (1 - $factor_a) * $factor_v; 1.291 + $overhead_percentage += $video_factor_max1 * $factor_a * (1 - $factor_v); 1.292 + $overhead_percentage += $video_factor_max2 * (1 - $factor_a) * (1 - $factor_v); 1.293 + 1.294 + return $overhead_percentage; 1.295 + } 1.296 + 1.297 + 1.298 + 1.299 + public static function MPEGvideoFramerateLookup($raw_frame_rate) { 1.300 + 1.301 + $lookup = array (0, 23.976, 24, 25, 29.97, 30, 50, 59.94, 60); 1.302 + 1.303 + return (float)(isset($lookup[$raw_frame_rate]) ? $lookup[$raw_frame_rate] : 0); 1.304 + } 1.305 + 1.306 + 1.307 + 1.308 + public static function MPEGvideoAspectRatioLookup($raw_aspect_ratio) { 1.309 + 1.310 + $lookup = array (0, 1, 0.6735, 0.7031, 0.7615, 0.8055, 0.8437, 0.8935, 0.9157, 0.9815, 1.0255, 1.0695, 1.0950, 1.1575, 1.2015, 0); 1.311 + 1.312 + return (float)(isset($lookup[$raw_aspect_ratio]) ? $lookup[$raw_aspect_ratio] : 0); 1.313 + } 1.314 + 1.315 + 1.316 + 1.317 + public static function MPEGvideoAspectRatioTextLookup($raw_aspect_ratio) { 1.318 + 1.319 + $lookup = array ('forbidden', 'square pixels', '0.6735', '16:9, 625 line, PAL', '0.7615', '0.8055', '16:9, 525 line, NTSC', '0.8935', '4:3, 625 line, PAL, CCIR601', '0.9815', '1.0255', '1.0695', '4:3, 525 line, NTSC, CCIR601', '1.1575', '1.2015', 'reserved'); 1.320 + 1.321 + return (isset($lookup[$raw_aspect_ratio]) ? $lookup[$raw_aspect_ratio] : ''); 1.322 + } 1.323 + 1.324 +} 1.325 + 1.326 + 1.327 +?> 1.328 \ No newline at end of file