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Editing: module.audio-video.mpeg.php
<?php ///////////////////////////////////////////////////////////////// /// getID3() by James Heinrich <info@getid3.org> // // 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 // // module for analyzing MPEG files // // dependencies: module.audio.mp3.php // // /// ///////////////////////////////////////////////////////////////// if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers exit; } getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.mp3.php', __FILE__, true); class getid3_mpeg extends getid3_handler { const START_CODE_BASE = "\x00\x00\x01"; const VIDEO_PICTURE_START = "\x00\x00\x01\x00"; const VIDEO_USER_DATA_START = "\x00\x00\x01\xB2"; const VIDEO_SEQUENCE_HEADER = "\x00\x00\x01\xB3"; const VIDEO_SEQUENCE_ERROR = "\x00\x00\x01\xB4"; const VIDEO_EXTENSION_START = "\x00\x00\x01\xB5"; const VIDEO_SEQUENCE_END = "\x00\x00\x01\xB7"; 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['fileformat'] = 'mpeg'; $this->fseek($info['avdataoffset']); $MPEGstreamData = $this->fread($this->getid3->option_fread_buffer_size); $MPEGstreamBaseOffset = 0; // how far are we from the beginning of the file data ($info['avdataoffset']) $MPEGstreamDataOffset = 0; // how far are we from the beginning of the buffer data (~32kB) $StartCodeValue = false; $prevStartCodeValue = false; $GOPcounter = -1; $FramesByGOP = array(); $ParsedAVchannels = array(); do { //echo $MPEGstreamDataOffset.' vs '.(strlen($MPEGstreamData) - 1024).'<Br>'; if ($MPEGstreamDataOffset > (strlen($MPEGstreamData) - 16384)) { // buffer running low, get more data //echo 'reading more data<br>'; $MPEGstreamData .= $this->fread($this->getid3->option_fread_buffer_size); if (strlen($MPEGstreamData) > $this->getid3->option_fread_buffer_size) { $MPEGstreamData = substr($MPEGstreamData, $MPEGstreamDataOffset); $MPEGstreamBaseOffset += $MPEGstreamDataOffset; $MPEGstreamDataOffset = 0; } } if (($StartCodeOffset = strpos($MPEGstreamData, self::START_CODE_BASE, $MPEGstreamDataOffset)) === false) { //echo 'no more start codes found.<br>'; break; } else { $MPEGstreamDataOffset = $StartCodeOffset; $prevStartCodeValue = $StartCodeValue; $StartCodeValue = ord(substr($MPEGstreamData, $StartCodeOffset + 3, 1)); //echo 'Found "'.strtoupper(dechex($StartCodeValue)).'" at offset '.($MPEGstreamBaseOffset + $StartCodeOffset).' ($MPEGstreamDataOffset = '.$MPEGstreamDataOffset.')<br>'; } $MPEGstreamDataOffset += 4; switch ($StartCodeValue) { case 0x00: // picture_start_code if (!empty($info['mpeg']['video']['bitrate_mode']) && ($info['mpeg']['video']['bitrate_mode'] == 'vbr')) { $bitstream = getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $StartCodeOffset + 4, 4)); $bitstreamoffset = 0; $PictureHeader = array(); $PictureHeader['temporal_reference'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 10); // 10-bit unsigned integer associated with each input picture. It is incremented by one, modulo 1024, for each input frame. When a frame is coded as two fields the temporal reference in the picture header of both fields is the same. Following a group start header the temporal reference of the earliest picture (in display order) shall be reset to zero. $PictureHeader['picture_coding_type'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 3); // 3 bits for picture_coding_type $PictureHeader['vbv_delay'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 16); // 16 bits for vbv_delay //... etc $FramesByGOP[$GOPcounter][] = $PictureHeader; } break; case 0xB3: // sequence_header_code // Note: purposely doing the less-pretty (and probably a bit slower) method of using string of bits rather than bitwise operations. // Mostly because PHP 32-bit doesn't handle unsigned integers well for bitwise operation. // Also the MPEG stream is designed as a bitstream and often doesn't align nicely with byte boundaries. $info['video']['codec'] = 'MPEG-1'; // will be updated if extension_start_code found $bitstream = getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $StartCodeOffset + 4, 8)); $bitstreamoffset = 0; $info['mpeg']['video']['raw']['horizontal_size_value'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 12); // 12 bits for horizontal frame size. Note: horizontal_size_extension, if present, will add 2 most-significant bits to this value $info['mpeg']['video']['raw']['vertical_size_value'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 12); // 12 bits for vertical frame size. Note: vertical_size_extension, if present, will add 2 most-significant bits to this value $info['mpeg']['video']['raw']['aspect_ratio_information'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 4); // 4 bits for aspect_ratio_information $info['mpeg']['video']['raw']['frame_rate_code'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 4); // 4 bits for Frame Rate id code $info['mpeg']['video']['raw']['bitrate'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 18); // 18 bits for bit_rate_value (18 set bits = VBR, otherwise bitrate = this value * 400) $marker_bit = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // The term "marker_bit" indicates a one bit field in which the value zero is forbidden. These marker bits are introduced at several points in the syntax to avoid start code emulation. $info['mpeg']['video']['raw']['vbv_buffer_size'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 10); // 10 bits vbv_buffer_size_value $info['mpeg']['video']['raw']['constrained_param_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: constrained_param_flag $info['mpeg']['video']['raw']['load_intra_quantiser_matrix'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: load_intra_quantiser_matrix if ($info['mpeg']['video']['raw']['load_intra_quantiser_matrix']) { $bitstream .= getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $StartCodeOffset + 12, 64)); for ($i = 0; $i < 64; $i++) { $info['mpeg']['video']['raw']['intra_quantiser_matrix'][$i] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8); } } $info['mpeg']['video']['raw']['load_non_intra_quantiser_matrix'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); if ($info['mpeg']['video']['raw']['load_non_intra_quantiser_matrix']) { $bitstream .= getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $StartCodeOffset + 12 + ($info['mpeg']['video']['raw']['load_intra_quantiser_matrix'] ? 64 : 0), 64)); for ($i = 0; $i < 64; $i++) { $info['mpeg']['video']['raw']['non_intra_quantiser_matrix'][$i] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8); } } $info['mpeg']['video']['pixel_aspect_ratio'] = self::videoAspectRatioLookup($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['mpeg']['video']['bitrate_mode'] = 'vbr'; } else { $info['mpeg']['video']['bitrate'] = $info['mpeg']['video']['raw']['bitrate'] * 400; $info['mpeg']['video']['bitrate_mode'] = 'cbr'; $info['video']['bitrate'] = $info['mpeg']['video']['bitrate']; } $info['video']['resolution_x'] = $info['mpeg']['video']['raw']['horizontal_size_value']; $info['video']['resolution_y'] = $info['mpeg']['video']['raw']['vertical_size_value']; $info['video']['frame_rate'] = $info['mpeg']['video']['frame_rate']; $info['video']['bitrate_mode'] = $info['mpeg']['video']['bitrate_mode']; $info['video']['pixel_aspect_ratio'] = $info['mpeg']['video']['pixel_aspect_ratio']; $info['video']['lossless'] = false; $info['video']['bits_per_sample'] = 24; break; case 0xB5: // extension_start_code $info['video']['codec'] = 'MPEG-2'; $bitstream = getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $StartCodeOffset + 4, 8)); // 48 bits for Sequence Extension ID; 61 bits for Sequence Display Extension ID; 59 bits for Sequence Scalable Extension ID $bitstreamoffset = 0; $info['mpeg']['video']['raw']['extension_start_code_identifier'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 4); // 4 bits for extension_start_code_identifier //echo $info['mpeg']['video']['raw']['extension_start_code_identifier'].'<br>'; switch ($info['mpeg']['video']['raw']['extension_start_code_identifier']) { case 1: // 0001 Sequence Extension ID $info['mpeg']['video']['raw']['profile_and_level_indication'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8); // 8 bits for profile_and_level_indication $info['mpeg']['video']['raw']['progressive_sequence'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: progressive_sequence $info['mpeg']['video']['raw']['chroma_format'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2); // 2 bits for chroma_format $info['mpeg']['video']['raw']['horizontal_size_extension'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2); // 2 bits for horizontal_size_extension $info['mpeg']['video']['raw']['vertical_size_extension'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2); // 2 bits for vertical_size_extension $info['mpeg']['video']['raw']['bit_rate_extension'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 12); // 12 bits for bit_rate_extension $marker_bit = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // The term "marker_bit" indicates a one bit field in which the value zero is forbidden. These marker bits are introduced at several points in the syntax to avoid start code emulation. $info['mpeg']['video']['raw']['vbv_buffer_size_extension'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8); // 8 bits for vbv_buffer_size_extension $info['mpeg']['video']['raw']['low_delay'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: low_delay $info['mpeg']['video']['raw']['frame_rate_extension_n'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2); // 2 bits for frame_rate_extension_n $info['mpeg']['video']['raw']['frame_rate_extension_d'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 5); // 5 bits for frame_rate_extension_d $info['video']['resolution_x'] = ($info['mpeg']['video']['raw']['horizontal_size_extension'] << 12) | $info['mpeg']['video']['raw']['horizontal_size_value']; $info['video']['resolution_y'] = ($info['mpeg']['video']['raw']['vertical_size_extension'] << 12) | $info['mpeg']['video']['raw']['vertical_size_value']; $info['video']['interlaced'] = !$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 $info['mpeg']['video']['raw']['video_format'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 3); // 3 bits for video_format $info['mpeg']['video']['raw']['colour_description'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: colour_description if ($info['mpeg']['video']['raw']['colour_description']) { $info['mpeg']['video']['raw']['colour_primaries'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8); // 8 bits for colour_primaries $info['mpeg']['video']['raw']['transfer_characteristics'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8); // 8 bits for transfer_characteristics $info['mpeg']['video']['raw']['matrix_coefficients'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8); // 8 bits for matrix_coefficients } $info['mpeg']['video']['raw']['display_horizontal_size'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 14); // 14 bits for display_horizontal_size $marker_bit = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // The term "marker_bit" indicates a one bit field in which the value zero is forbidden. These marker bits are introduced at several points in the syntax to avoid start code emulation. $info['mpeg']['video']['raw']['display_vertical_size'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 14); // 14 bits for display_vertical_size $info['mpeg']['video']['video_format'] = self::videoFormatTextLookup($info['mpeg']['video']['raw']['video_format']); break; case 3: // 0011 Quant Matrix Extension ID break; case 5: // 0101 Sequence Scalable Extension ID $info['mpeg']['video']['raw']['scalable_mode'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2); // 2 bits for scalable_mode $info['mpeg']['video']['raw']['layer_id'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 4); // 4 bits for layer_id if ($info['mpeg']['video']['raw']['scalable_mode'] == 1) { // "spatial scalability" $info['mpeg']['video']['raw']['lower_layer_prediction_horizontal_size'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 14); // 14 bits for lower_layer_prediction_horizontal_size $marker_bit = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // The term "marker_bit" indicates a one bit field in which the value zero is forbidden. These marker bits are introduced at several points in the syntax to avoid start code emulation. $info['mpeg']['video']['raw']['lower_layer_prediction_vertical_size'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 14); // 14 bits for lower_layer_prediction_vertical_size $info['mpeg']['video']['raw']['horizontal_subsampling_factor_m'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 5); // 5 bits for horizontal_subsampling_factor_m $info['mpeg']['video']['raw']['horizontal_subsampling_factor_n'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 5); // 5 bits for horizontal_subsampling_factor_n $info['mpeg']['video']['raw']['vertical_subsampling_factor_m'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 5); // 5 bits for vertical_subsampling_factor_m $info['mpeg']['video']['raw']['vertical_subsampling_factor_n'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 5); // 5 bits for vertical_subsampling_factor_n } elseif ($info['mpeg']['video']['raw']['scalable_mode'] == 3) { // "temporal scalability" $info['mpeg']['video']['raw']['picture_mux_enable'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: picture_mux_enable if ($info['mpeg']['video']['raw']['picture_mux_enable']) { $info['mpeg']['video']['raw']['mux_to_progressive_sequence'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: mux_to_progressive_sequence } $info['mpeg']['video']['raw']['picture_mux_order'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 3); // 3 bits for picture_mux_order $info['mpeg']['video']['raw']['picture_mux_factor'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 3); // 3 bits for picture_mux_factor } $info['mpeg']['video']['scalable_mode'] = self::scalableModeTextLookup($info['mpeg']['video']['raw']['scalable_mode']); break; case 7: // 0111 Picture Display Extension ID break; case 8: // 1000 Picture Coding Extension ID $info['mpeg']['video']['raw']['f_code_00'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 4); // 4 bits for f_code[0][0] (forward horizontal) $info['mpeg']['video']['raw']['f_code_01'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 4); // 4 bits for f_code[0][1] (forward vertical) $info['mpeg']['video']['raw']['f_code_10'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 4); // 4 bits for f_code[1][0] (backward horizontal) $info['mpeg']['video']['raw']['f_code_11'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 4); // 4 bits for f_code[1][1] (backward vertical) $info['mpeg']['video']['raw']['intra_dc_precision'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2); // 2 bits for intra_dc_precision $info['mpeg']['video']['raw']['picture_structure'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2); // 2 bits for picture_structure $info['mpeg']['video']['raw']['top_field_first'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: top_field_first $info['mpeg']['video']['raw']['frame_pred_frame_dct'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: frame_pred_frame_dct $info['mpeg']['video']['raw']['concealment_motion_vectors'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: concealment_motion_vectors $info['mpeg']['video']['raw']['q_scale_type'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: q_scale_type $info['mpeg']['video']['raw']['intra_vlc_format'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: intra_vlc_format $info['mpeg']['video']['raw']['alternate_scan'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: alternate_scan $info['mpeg']['video']['raw']['repeat_first_field'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: repeat_first_field $info['mpeg']['video']['raw']['chroma_420_type'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: chroma_420_type $info['mpeg']['video']['raw']['progressive_frame'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: progressive_frame $info['mpeg']['video']['raw']['composite_display_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: composite_display_flag if ($info['mpeg']['video']['raw']['composite_display_flag']) { $info['mpeg']['video']['raw']['v_axis'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: v_axis $info['mpeg']['video']['raw']['field_sequence'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 3); // 3 bits for field_sequence $info['mpeg']['video']['raw']['sub_carrier'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: sub_carrier $info['mpeg']['video']['raw']['burst_amplitude'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 7); // 7 bits for burst_amplitude $info['mpeg']['video']['raw']['sub_carrier_phase'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8); // 8 bits for sub_carrier_phase } $info['mpeg']['video']['intra_dc_precision_bits'] = $info['mpeg']['video']['raw']['intra_dc_precision'] + 8; $info['mpeg']['video']['picture_structure'] = self::pictureStructureTextLookup($info['mpeg']['video']['raw']['picture_structure']); break; case 9: // 1001 Picture Spatial Scalable Extension ID break; case 10: // 1010 Picture Temporal Scalable Extension ID break; default: $this->warning('Unexpected $info[mpeg][video][raw][extension_start_code_identifier] value of '.$info['mpeg']['video']['raw']['extension_start_code_identifier']); break; } break; case 0xB8: // group_of_pictures_header $GOPcounter++; if (!empty($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 = array(); $GOPheader['byte_offset'] = $MPEGstreamBaseOffset + $StartCodeOffset; $GOPheader['drop_frame_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: drop_frame_flag $GOPheader['time_code_hours'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 5); // 5 bits for time_code_hours $GOPheader['time_code_minutes'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 6); // 6 bits for time_code_minutes $marker_bit = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // The term "marker_bit" indicates a one bit field in which the value zero is forbidden. These marker bits are introduced at several points in the syntax to avoid start code emulation. $GOPheader['time_code_seconds'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 6); // 6 bits for time_code_seconds $GOPheader['time_code_pictures'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 6); // 6 bits for time_code_pictures $GOPheader['closed_gop'] = self::readBitsFromStream($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 "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'][] = $GOPheader; } break; case 0xC0: // audio stream case 0xC1: // audio stream case 0xC2: // audio stream case 0xC3: // audio stream case 0xC4: // audio stream case 0xC5: // audio stream case 0xC6: // audio stream case 0xC7: // audio stream case 0xC8: // audio stream case 0xC9: // audio stream case 0xCA: // audio stream case 0xCB: // audio stream case 0xCC: // audio stream case 0xCD: // audio stream case 0xCE: // audio stream case 0xCF: // audio stream case 0xD0: // audio stream case 0xD1: // audio stream case 0xD2: // audio stream case 0xD3: // audio stream case 0xD4: // audio stream case 0xD5: // audio stream case 0xD6: // audio stream case 0xD7: // audio stream case 0xD8: // audio stream case 0xD9: // audio stream case 0xDA: // audio stream case 0xDB: // audio stream case 0xDC: // audio stream case 0xDD: // audio stream case 0xDE: // audio stream case 0xDF: // audio stream //case 0xE0: // video stream //case 0xE1: // video stream //case 0xE2: // video stream //case 0xE3: // video stream //case 0xE4: // video stream //case 0xE5: // video stream //case 0xE6: // video stream //case 0xE7: // video stream //case 0xE8: // video stream //case 0xE9: // video stream //case 0xEA: // video stream //case 0xEB: // video stream //case 0xEC: // video stream //case 0xED: // video stream //case 0xEE: // video stream //case 0xEF: // video stream if (isset($ParsedAVchannels[$StartCodeValue])) { break; } $ParsedAVchannels[$StartCodeValue] = $StartCodeValue; // http://en.wikipedia.org/wiki/Packetized_elementary_stream // http://dvd.sourceforge.net/dvdinfo/pes-hdr.html /* $PackedElementaryStream = array(); if ($StartCodeValue >= 0xE0) { $PackedElementaryStream['stream_type'] = 'video'; $PackedElementaryStream['stream_id'] = $StartCodeValue - 0xE0; } else { $PackedElementaryStream['stream_type'] = 'audio'; $PackedElementaryStream['stream_id'] = $StartCodeValue - 0xC0; } $PackedElementaryStream['packet_length'] = getid3_lib::BigEndian2Int(substr($MPEGstreamData, $StartCodeOffset + 4, 2)); $bitstream = getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $StartCodeOffset + 6, 3)); // more may be needed below $bitstreamoffset = 0; $PackedElementaryStream['marker_bits'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2); // 2 bits for marker_bits -- should be "10" = 2 echo 'marker_bits = '.$PackedElementaryStream['marker_bits'].'<br>'; $PackedElementaryStream['scrambling_control'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2); // 2 bits for scrambling_control -- 00 implies not scrambled $PackedElementaryStream['priority'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: priority $PackedElementaryStream['data_alignment_indicator'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: data_alignment_indicator -- 1 indicates that the PES packet header is immediately followed by the video start code or audio syncword $PackedElementaryStream['copyright'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: copyright -- 1 implies copyrighted $PackedElementaryStream['original_or_copy'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: original_or_copy -- 1 implies original $PackedElementaryStream['pts_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: pts_flag -- Presentation Time Stamp $PackedElementaryStream['dts_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: dts_flag -- Decode Time Stamp $PackedElementaryStream['escr_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: escr_flag -- Elementary Stream Clock Reference $PackedElementaryStream['es_rate_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: es_rate_flag -- Elementary Stream [data] Rate $PackedElementaryStream['dsm_trick_mode_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: dsm_trick_mode_flag -- DSM trick mode - not used by DVD $PackedElementaryStream['additional_copy_info_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: additional_copy_info_flag $PackedElementaryStream['crc_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: crc_flag $PackedElementaryStream['extension_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: extension_flag $PackedElementaryStream['pes_remain_header_length'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8); // 1 bit flag: priority $additional_header_bytes = 0; $additional_header_bytes += ($PackedElementaryStream['pts_flag'] ? 5 : 0); $additional_header_bytes += ($PackedElementaryStream['dts_flag'] ? 5 : 0); $additional_header_bytes += ($PackedElementaryStream['escr_flag'] ? 6 : 0); $additional_header_bytes += ($PackedElementaryStream['es_rate_flag'] ? 3 : 0); $additional_header_bytes += ($PackedElementaryStream['additional_copy_info_flag'] ? 1 : 0); $additional_header_bytes += ($PackedElementaryStream['crc_flag'] ? 2 : 0); $additional_header_bytes += ($PackedElementaryStream['extension_flag'] ? 1 : 0); $PackedElementaryStream['additional_header_bytes'] = $additional_header_bytes; $bitstream .= getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $StartCodeOffset + 9, $additional_header_bytes)); $info['mpeg']['packed_elementary_streams'][$PackedElementaryStream['stream_type']][$PackedElementaryStream['stream_id']][] = $PackedElementaryStream; */ $getid3_temp = new getID3(); $getid3_temp->openfile($this->getid3->filename, $this->getid3->info['filesize'], $this->getid3->fp); $getid3_temp->info = $info; $getid3_mp3 = new getid3_mp3($getid3_temp); 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 $getid3_temp->info = $info; // only overwrite real data if valid header found //echo 'audio at? '.($MPEGstreamBaseOffset + $StartCodeOffset + 4 + 8 + $i).'<br>'; if ($getid3_mp3->decodeMPEGaudioHeader($MPEGstreamBaseOffset + $StartCodeOffset + 4 + 8 + $i, $getid3_temp->info, false)) { //echo 'yes!<br>'; $info = $getid3_temp->info; $info['audio']['bitrate_mode'] = 'cbr'; $info['audio']['lossless'] = false; break; } } unset($getid3_temp, $getid3_mp3); break; case 0xBC: // Program Stream Map case 0xBD: // Private stream 1 (non MPEG audio, subpictures) case 0xBE: // Padding stream case 0xBF: // Private stream 2 (navigation data) case 0xF0: // ECM stream case 0xF1: // EMM stream case 0xF2: // DSM-CC stream case 0xF3: // ISO/IEC_13522_stream case 0xF4: // ITU-I Rec. H.222.1 type A case 0xF5: // ITU-I Rec. H.222.1 type B case 0xF6: // ITU-I Rec. H.222.1 type C case 0xF7: // ITU-I Rec. H.222.1 type D case 0xF8: // ITU-I Rec. H.222.1 type E case 0xF9: // ancilliary stream case 0xFA: // ISO/IEC 14496-1 SL-packtized stream case 0xFB: // ISO/IEC 14496-1 FlexMux stream case 0xFC: // metadata stream case 0xFD: // extended stream ID case 0xFE: // reserved data stream case 0xFF: // program stream directory // ignore break; default: // ignore break; } } while (true); // // Temporary hack to account for interleaving overhead: // if (!empty($info['video']['bitrate']) && !empty($info['audio']['bitrate'])) { // $info['playtime_seconds'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / ($info['video']['bitrate'] + $info['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 pattern // // Use interpolated lookup tables to approximately guess how much is overhead, because // // playtime is calculated as filesize / total-bitrate // $info['playtime_seconds'] *= self::systemNonOverheadPercentage($info['video']['bitrate'], $info['audio']['bitrate']); // // //switch ($info['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: // // $multiplier = 1; // // break; // //} // //$info['playtime_seconds'] *= $multiplier; // //$this->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) { // $this->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.'); // } // } // /* $time_prev = 0; $byte_prev = 0; $vbr_bitrates = array(); foreach ($info['mpeg']['group_of_pictures'] as $gopkey => $gopdata) { $time_this = ($gopdata['time_code_hours'] * 3600) + ($gopdata['time_code_minutes'] * 60) + $gopdata['time_code_seconds'] + ($gopdata['time_code_seconds'] / 30); $byte_this = $gopdata['byte_offset']; if ($gopkey > 0) { if ($time_this > $time_prev) { $bytedelta = $byte_this - $byte_prev; $timedelta = $time_this - $time_prev; $this_bitrate = ($bytedelta * 8) / $timedelta; echo $gopkey.': ('.number_format($time_prev, 2).'-'.number_format($time_this, 2).') '.number_format($bytedelta).' bytes over '.number_format($timedelta, 3).' seconds = '.number_format($this_bitrate / 1000, 2).'kbps<br>'; $time_prev = $time_this; $byte_prev = $byte_this; $vbr_bitrates[] = $this_bitrate; } } } echo 'average_File_bitrate = '.number_format(array_sum($vbr_bitrates) / count($vbr_bitrates), 1).'<br>'; */ //echo '<pre>'.print_r($FramesByGOP, true).'</pre>'; if (!empty($info['mpeg']['video']['bitrate_mode']) && ($info['mpeg']['video']['bitrate_mode'] == 'vbr')) { $last_GOP_id = max(array_keys($FramesByGOP)); $frames_in_last_GOP = count($FramesByGOP[$last_GOP_id]); $gopdata = &$info['mpeg']['group_of_pictures'][$last_GOP_id]; $info['playtime_seconds'] = ($gopdata['time_code_hours'] * 3600) + ($gopdata['time_code_minutes'] * 60) + $gopdata['time_code_seconds'] + (($gopdata['time_code_pictures'] + $frames_in_last_GOP + 1) / $info['mpeg']['video']['frame_rate']); if (!isset($info['video']['bitrate'])) { $overall_bitrate = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['playtime_seconds']; $info['video']['bitrate'] = $overall_bitrate - (isset($info['audio']['bitrate']) ? $info['audio']['bitrate'] : 0); } unset($info['mpeg']['group_of_pictures']); } return true; } /** * @param string $bitstream * @param int $bitstreamoffset * @param int $bits_to_read * @param bool $return_singlebit_as_boolean * * @return bool|int */ private function readBitsFromStream(&$bitstream, &$bitstreamoffset, $bits_to_read, $return_singlebit_as_boolean=true) { $return = bindec(substr($bitstream, $bitstreamoffset, $bits_to_read)); $bitstreamoffset += $bits_to_read; if (($bits_to_read == 1) && $return_singlebit_as_boolean) { $return = (bool) $return; } return $return; } /** * @param int $VideoBitrate * @param int $AudioBitrate * * @return float|int */ public static function systemNonOverheadPercentage($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) $OverheadMultiplierByBitrate = array(); //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; } /** * @param int $rawframerate * * @return float */ public static function videoFramerateLookup($rawframerate) { $lookup = array(0, 23.976, 24, 25, 29.97, 30, 50, 59.94, 60); return (float) (isset($lookup[$rawframerate]) ? $lookup[$rawframerate] : 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 && $width != 0) { // Calculate pixel aspect ratio from MPEG-2 display aspect ratio $ratio = $ratio * $height / $width; } return $ratio; } /** * @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] : ''); } }
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