diff options
Diffstat (limited to 'modules/getid3/module.audio-video.mpeg.php')
| -rw-r--r-- | modules/getid3/module.audio-video.mpeg.php | 44 |
1 files changed, 22 insertions, 22 deletions
diff --git a/modules/getid3/module.audio-video.mpeg.php b/modules/getid3/module.audio-video.mpeg.php index a0d2cd61..0d62b0ac 100644 --- a/modules/getid3/module.audio-video.mpeg.php +++ b/modules/getid3/module.audio-video.mpeg.php @@ -22,8 +22,8 @@ // // $Id: module.audio-video.mpeg.php,v 1.3 2006/11/02 10:48:00 ah Exp $ - - + + class getid3_mpeg extends getid3_handler { @@ -35,21 +35,21 @@ class getid3_mpeg extends getid3_handler const VIDEO_SEQUENCE_END = "\x00\x00\x01\xB7"; const VIDEO_GROUP_START = "\x00\x00\x01\xB8"; const AUDIO_START = "\x00\x00\x01\xC0"; - + public function Analyze() { - + $getid3 = $this->getid3; - + $getid3->info['mpeg']['video']['raw'] = array (); $info_mpeg_video = &$getid3->info['mpeg']['video']; $info_mpeg_video_raw = &$info_mpeg_video['raw']; - + $getid3->info['video'] = array (); $info_video = &$getid3->info['video']; - + $getid3->include_module('audio.mp3'); - + if ($getid3->info['avdataend'] <= $getid3->info['avdataoffset']) { throw new getid3_exception('"avdataend" ('.$getid3->info['avdataend'].') is unexpectedly less-than-or-equal-to "avdataoffset" ('.$getid3->info['avdataoffset'].')'); } @@ -97,7 +97,7 @@ class getid3_mpeg extends getid3_handler $info_mpeg_video_raw['framesize_vertical'] = ($frame_size_dword & 0x000FFF); // 12 bits for vertical frame size $info_mpeg_video_raw['pixel_aspect_ratio'] = ($aspect_ratio_frame_rate_dword & 0xF0) >> 4; $info_mpeg_video_raw['frame_rate'] = ($aspect_ratio_frame_rate_dword & 0x0F); - + $info_mpeg_video['framesize_horizontal'] = $info_mpeg_video_raw['framesize_horizontal']; $info_mpeg_video['framesize_vertical'] = $info_mpeg_video_raw['framesize_vertical']; @@ -110,7 +110,7 @@ class getid3_mpeg extends getid3_handler $info_mpeg_video_raw['vbv_buffer_size'] = bindec(substr($assorted_information, 19, 10)); $info_mpeg_video_raw['constrained_param_flag'] = (bool)bindec($assorted_information{29}); $info_mpeg_video_raw['intra_quant_flag'] = (bool)bindec($assorted_information{30}); - + if ($info_mpeg_video_raw['intra_quant_flag']) { // read 512 bits @@ -182,7 +182,7 @@ class getid3_mpeg extends getid3_handler // clone getid3 - better safe than sorry $clone = clone $this->getid3; - + // check $mp3 = new getid3_mp3($clone); if ($mp3->decodeMPEGaudioHeader($getid3->fp, ($audio_chunk_offset + 3) + 8 + $i, $dummy, false)) { @@ -192,7 +192,7 @@ class getid3_mpeg extends getid3_handler $getid3->info['audio']['lossless'] = false; break 2; } - + // destroy copy unset($dummy); } @@ -227,7 +227,7 @@ class getid3_mpeg extends getid3_handler //} //$getid3->info['playtime_seconds'] *= $multiplier; //$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.'); - + if ($info_video['bitrate'] < 50000) { $getid3->warning('Interleaved MPEG audio/video playtime may be slightly inaccurate for video bitrates below 100kbps. Except in extreme low-bitrate situations, error should be less than 1%. Report to info@getid3.org if greater than this.'); } @@ -239,7 +239,7 @@ class getid3_mpeg extends getid3_handler public static function MPEGsystemNonOverheadPercentage($video_bitrate, $audio_bitrate) { - + $overhead_percentage = 0; $audio_bitrate = max(min($audio_bitrate / 1000, 384), 32); // limit to range of 32kbps - 384kbps (should be only legal bitrates, but maybe VBR?) @@ -264,7 +264,7 @@ class getid3_mpeg extends getid3_handler $bitrate_to_use_min = $bitrate_to_use_max = $previous_bitrate = 32; foreach ($overhead_multiplier_by_bitrate as $key => $value) { - + if ($audio_bitrate >= $previous_bitrate) { $bitrate_to_use_min = $previous_bitrate; } @@ -274,7 +274,7 @@ class getid3_mpeg extends getid3_handler } $previous_bitrate = $key; } - + $factor_a = ($bitrate_to_use_max - $audio_bitrate) / ($bitrate_to_use_max - $bitrate_to_use_min); $video_bitrate_log10 = log10($video_bitrate); @@ -295,27 +295,27 @@ class getid3_mpeg extends getid3_handler public static function MPEGvideoFramerateLookup($raw_frame_rate) { - + $lookup = array (0, 23.976, 24, 25, 29.97, 30, 50, 59.94, 60); - + return (float)(isset($lookup[$raw_frame_rate]) ? $lookup[$raw_frame_rate] : 0); } public static function MPEGvideoAspectRatioLookup($raw_aspect_ratio) { - + $lookup = array (0, 1, 0.6735, 0.7031, 0.7615, 0.8055, 0.8437, 0.8935, 0.9157, 0.9815, 1.0255, 1.0695, 1.0950, 1.1575, 1.2015, 0); - + return (float)(isset($lookup[$raw_aspect_ratio]) ? $lookup[$raw_aspect_ratio] : 0); } public static function MPEGvideoAspectRatioTextLookup($raw_aspect_ratio) { - + $lookup = array ('forbidden', 'square pixels', '0.6735', '16:9, 625 line, PAL', '0.7615', '0.8055', '16:9, 525 line, NTSC', '0.8935', '4:3, 625 line, PAL, CCIR601', '0.9815', '1.0255', '1.0695', '4:3, 525 line, NTSC, CCIR601', '1.1575', '1.2015', 'reserved'); - + return (isset($lookup[$raw_aspect_ratio]) ? $lookup[$raw_aspect_ratio] : ''); } |