<?php
+
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
-// available at http://getid3.sourceforge.net //
-// or http://www.getid3.org //
-// also https://github.com/JamesHeinrich/getID3 //
-/////////////////////////////////////////////////////////////////
-// See readme.txt for more details //
+// available at https://github.com/JamesHeinrich/getID3 //
+// or https://www.getid3.org //
+// or http://getid3.sourceforge.net //
+// see readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.audio-video.mpeg.php //
getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.mp3.php', __FILE__, true);
-class getid3_mpeg extends getid3_handler {
+class getid3_mpeg extends getid3_handler
+{
const START_CODE_BASE = "\x00\x00\x01";
const VIDEO_PICTURE_START = "\x00\x00\x01\x00";
const VIDEO_GROUP_START = "\x00\x00\x01\xB8";
const AUDIO_START = "\x00\x00\x01\xC0";
-
+ /**
+ * @return bool
+ */
public function Analyze() {
$info = &$this->getid3->info;
}
}
- $info['mpeg']['video']['pixel_aspect_ratio'] = self::videoAspectRatioLookup($info['mpeg']['video']['raw']['aspect_ratio_information']);
- $info['mpeg']['video']['pixel_aspect_ratio_text'] = self::videoAspectRatioTextLookup($info['mpeg']['video']['raw']['aspect_ratio_information']);
+ $info['mpeg']['video']['pixel_aspect_ratio'] = self::videoAspectRatioLookup($info['mpeg']['video']['raw']['aspect_ratio_information']); // may be overridden later if file turns out to be MPEG-2
+ $info['mpeg']['video']['pixel_aspect_ratio_text'] = self::videoAspectRatioTextLookup($info['mpeg']['video']['raw']['aspect_ratio_information']); // may be overridden later if file turns out to be MPEG-2
$info['mpeg']['video']['frame_rate'] = self::videoFramerateLookup($info['mpeg']['video']['raw']['frame_rate_code']);
if ($info['mpeg']['video']['raw']['bitrate'] == 0x3FFFF) { // 18 set bits = VBR
//$this->warning('This version of getID3() ['.$this->getid3->version().'] cannot determine average bitrate of VBR MPEG video files');
$info['video']['interlaced'] = !$info['mpeg']['video']['raw']['progressive_sequence'];
$info['mpeg']['video']['interlaced'] = !$info['mpeg']['video']['raw']['progressive_sequence'];
$info['mpeg']['video']['chroma_format'] = self::chromaFormatTextLookup($info['mpeg']['video']['raw']['chroma_format']);
+
+ if (isset($info['mpeg']['video']['raw']['aspect_ratio_information'])) {
+ // MPEG-2 defines the aspect ratio flag differently from MPEG-1, but the MPEG-2 extension start code may occur after we've already looked up the aspect ratio assuming it was MPEG-1, so re-lookup assuming MPEG-2
+ // This must be done after the extended size is known, so the display aspect ratios can be converted to pixel aspect ratios.
+ $info['mpeg']['video']['pixel_aspect_ratio'] = self::videoAspectRatioLookup($info['mpeg']['video']['raw']['aspect_ratio_information'], 2, $info['video']['resolution_x'], $info['video']['resolution_y']);
+ $info['mpeg']['video']['pixel_aspect_ratio_text'] = self::videoAspectRatioTextLookup($info['mpeg']['video']['raw']['aspect_ratio_information'], 2);
+ $info['video']['pixel_aspect_ratio'] = $info['mpeg']['video']['pixel_aspect_ratio'];
+ $info['video']['pixel_aspect_ratio_text'] = $info['mpeg']['video']['pixel_aspect_ratio_text'];
+ }
+
break;
case 2: // 0010 Sequence Display Extension ID
case 0xB8: // group_of_pictures_header
$GOPcounter++;
- if ($info['mpeg']['video']['bitrate_mode'] == 'vbr') {
+ if (!empty($info['mpeg']['video']['bitrate_mode']) && ($info['mpeg']['video']['bitrate_mode'] == 'vbr')) {
$bitstream = getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $StartCodeOffset + 4, 4)); // 27 bits needed for group_of_pictures_header
$bitstreamoffset = 0;
$GOPheader['closed_gop'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: closed_gop
$GOPheader['broken_link'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: broken_link
- $time_code_separator = ($GOPheader['drop_frame_flag'] ? ';' : ':'); // While non-drop time code is displayed with colons separating the digit pairs\97"HH:MM:SS:FF"\97drop frame is usually represented with a semi-colon (;) or period (.) as the divider between all the digit pairs\97"HH;MM;SS;FF", "HH.MM.SS.FF"
+ $time_code_separator = ($GOPheader['drop_frame_flag'] ? ';' : ':'); // While non-drop time code is displayed with colons separating the digit pairs "HH:MM:SS:FF" drop frame is usually represented with a semi-colon (;) or period (.) as the divider between all the digit pairs "HH;MM;SS;FF", "HH.MM.SS.FF"
$GOPheader['time_code'] = sprintf('%02d'.$time_code_separator.'%02d'.$time_code_separator.'%02d'.$time_code_separator.'%02d', $GOPheader['time_code_hours'], $GOPheader['time_code_minutes'], $GOPheader['time_code_seconds'], $GOPheader['time_code_pictures']);
$info['mpeg']['group_of_pictures'][] = $GOPheader;
return true;
}
+ /**
+ * @param string $bitstream
+ * @param int $bitstreamoffset
+ * @param int $bits_to_read
+ * @param bool $return_singlebit_as_boolean
+ *
+ * @return bool|float|int
+ */
private function readBitsFromStream(&$bitstream, &$bitstreamoffset, $bits_to_read, $return_singlebit_as_boolean=true) {
$return = bindec(substr($bitstream, $bitstreamoffset, $bits_to_read));
$bitstreamoffset += $bits_to_read;
return $return;
}
-
+ /**
+ * @param int $VideoBitrate
+ * @param int $AudioBitrate
+ *
+ * @return float|int
+ */
public static function systemNonOverheadPercentage($VideoBitrate, $AudioBitrate) {
$OverheadPercentage = 0;
return $OverheadPercentage;
}
-
+ /**
+ * @param int $rawframerate
+ *
+ * @return float
+ */
public static function videoFramerateLookup($rawframerate) {
$lookup = array(0, 23.976, 24, 25, 29.97, 30, 50, 59.94, 60);
- return (isset($lookup[$rawframerate]) ? (float) $lookup[$rawframerate] : (float) 0);
+ return (float) (isset($lookup[$rawframerate]) ? $lookup[$rawframerate] : 0);
}
- public static function videoAspectRatioLookup($rawaspectratio) {
- $lookup = array(0, 1, 0.6735, 0.7031, 0.7615, 0.8055, 0.8437, 0.8935, 0.9157, 0.9815, 1.0255, 1.0695, 1.0950, 1.1575, 1.2015, 0);
- return (isset($lookup[$rawaspectratio]) ? (float) $lookup[$rawaspectratio] : (float) 0);
+ /**
+ * @param int $rawaspectratio
+ * @param int $mpeg_version
+ * @param int $width
+ * @param int $height
+ *
+ * @return float
+ */
+ public static function videoAspectRatioLookup($rawaspectratio, $mpeg_version=1, $width=0, $height=0) {
+ $lookup = array(
+ 1 => 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),
+ 2 => array(0, 1, 1.3333, 1.7778, 2.2100, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
+ );
+ $ratio = (float) (isset($lookup[$mpeg_version][$rawaspectratio]) ? $lookup[$mpeg_version][$rawaspectratio] : 0);
+ if ($mpeg_version == 2 && $ratio != 1) {
+ // Calculate pixel aspect ratio from MPEG-2 display aspect ratio
+ $ratio = $ratio * $height / $width;
+ }
+ return $ratio;
}
- public static function videoAspectRatioTextLookup($rawaspectratio) {
- $lookup = array('forbidden', 'square pixels', '0.6735', '16:9, 625 line, PAL', '0.7615', '0.8055', '16:9, 525 line, NTSC', '0.8935', '4:3, 625 line, PAL, CCIR601', '0.9815', '1.0255', '1.0695', '4:3, 525 line, NTSC, CCIR601', '1.1575', '1.2015', 'reserved');
- return (isset($lookup[$rawaspectratio]) ? $lookup[$rawaspectratio] : '');
+ /**
+ * @param int $rawaspectratio
+ * @param int $mpeg_version
+ *
+ * @return string
+ */
+ public static function videoAspectRatioTextLookup($rawaspectratio, $mpeg_version=1) {
+ $lookup = array(
+ 1 => array('forbidden', 'square pixels', '0.6735', '16:9, 625 line, PAL', '0.7615', '0.8055', '16:9, 525 line, NTSC', '0.8935', '4:3, 625 line, PAL, CCIR601', '0.9815', '1.0255', '1.0695', '4:3, 525 line, NTSC, CCIR601', '1.1575', '1.2015', 'reserved'),
+ 2 => array('forbidden', 'square pixels', '4:3', '16:9', '2.21:1', 'reserved', 'reserved', 'reserved', 'reserved', 'reserved', 'reserved', 'reserved', 'reserved', 'reserved', 'reserved', 'reserved'), // http://dvd.sourceforge.net/dvdinfo/mpeghdrs.html
+ );
+ return (isset($lookup[$mpeg_version][$rawaspectratio]) ? $lookup[$mpeg_version][$rawaspectratio] : '');
}
+ /**
+ * @param int $video_format
+ *
+ * @return string
+ */
public static function videoFormatTextLookup($video_format) {
// ISO/IEC 13818-2, section 6.3.6, Table 6-6. Meaning of video_format
$lookup = array('component', 'PAL', 'NTSC', 'SECAM', 'MAC', 'Unspecified video format', 'reserved(6)', 'reserved(7)');
return (isset($lookup[$video_format]) ? $lookup[$video_format] : '');
}
+ /**
+ * @param int $scalable_mode
+ *
+ * @return string
+ */
public static function scalableModeTextLookup($scalable_mode) {
// ISO/IEC 13818-2, section 6.3.8, Table 6-10. Definition of scalable_mode
$lookup = array('data partitioning', 'spatial scalability', 'SNR scalability', 'temporal scalability');
return (isset($lookup[$scalable_mode]) ? $lookup[$scalable_mode] : '');
}
+ /**
+ * @param int $picture_structure
+ *
+ * @return string
+ */
public static function pictureStructureTextLookup($picture_structure) {
// ISO/IEC 13818-2, section 6.3.11, Table 6-14 Meaning of picture_structure
$lookup = array('reserved', 'Top Field', 'Bottom Field', 'Frame picture');
return (isset($lookup[$picture_structure]) ? $lookup[$picture_structure] : '');
}
+ /**
+ * @param int $chroma_format
+ *
+ * @return string
+ */
public static function chromaFormatTextLookup($chroma_format) {
// ISO/IEC 13818-2, section 6.3.11, Table 6-14 Meaning of picture_structure
$lookup = array('reserved', '4:2:0', '4:2:2', '4:4:4');
return (isset($lookup[$chroma_format]) ? $lookup[$chroma_format] : '');
}
-}
\ No newline at end of file
+}
dépôts / lhc / web / www.git / blobdiff