module.audio-video.asf.php

一个用PHP编写的

					$offset += 4; // reserved - DWORD
					$StreamPropertiesObjectData['type_specific_data'] = substr($ASFHeaderData, $offset, $StreamPropertiesObjectData['type_data_length']);
					$offset += $StreamPropertiesObjectData['type_data_length'];
					$StreamPropertiesObjectData['error_correct_data'] = substr($ASFHeaderData, $offset, $StreamPropertiesObjectData['error_data_length']);
					$offset += $StreamPropertiesObjectData['error_data_length'];

					switch ($StreamPropertiesObjectData['stream_type']) {

						case GETID3_ASF_Audio_Media:
							$thisfile_audio['dataformat']   = (!empty($thisfile_audio['dataformat'])   ? $thisfile_audio['dataformat']   : 'asf');
							$thisfile_audio['bitrate_mode'] = (!empty($thisfile_audio['bitrate_mode']) ? $thisfile_audio['bitrate_mode'] : 'cbr');

							$audiodata = getid3_riff::RIFFparseWAVEFORMATex(substr($StreamPropertiesObjectData['type_specific_data'], 0, 16));
							unset($audiodata['raw']);
							$thisfile_audio = getid3_lib::array_merge_noclobber($audiodata, $thisfile_audio);
							break;

						case GETID3_ASF_Video_Media:
							$thisfile_video['dataformat']   = (!empty($thisfile_video['dataformat'])   ? $thisfile_video['dataformat']   : 'asf');
							$thisfile_video['bitrate_mode'] = (!empty($thisfile_video['bitrate_mode']) ? $thisfile_video['bitrate_mode'] : 'cbr');
							break;

						case GETID3_ASF_Command_Media:
						default:
							// do nothing
							break;

					}

					$thisfile_asf['stream_properties_object'][$StreamPropertiesObjectStreamNumber] = $StreamPropertiesObjectData;
					unset($StreamPropertiesObjectData); // clear for next stream, if any
					break;

				case GETID3_ASF_Header_Extension_Object:
					// Header Extension Object: (mandatory, one only)
					// Field Name                   Field Type   Size (bits)
					// Object ID                    GUID         128             // GUID for Header Extension object - GETID3_ASF_Header_Extension_Object
					// Object Size                  QWORD        64              // size of Header Extension object, including 46 bytes of Header Extension Object header
					// Reserved Field 1             GUID         128             // hardcoded: GETID3_ASF_Reserved_1
					// Reserved Field 2             WORD         16              // hardcoded: 0x00000006
					// Header Extension Data Size   DWORD        32              // in bytes. valid: 0, or > 24. equals object size minus 46
					// Header Extension Data        BYTESTREAM   variable        // array of zero or more extended header objects

					// shortcut
					$thisfile_asf['header_extension_object'] = array();
					$thisfile_asf_headerextensionobject      = &$thisfile_asf['header_extension_object'];

					$thisfile_asf_headerextensionobject['objectid']            = $NextObjectGUID;
					$thisfile_asf_headerextensionobject['objectid_guid']       = $NextObjectGUIDtext;
					$thisfile_asf_headerextensionobject['objectsize']          = $NextObjectSize;
					$thisfile_asf_headerextensionobject['reserved_1']          = substr($ASFHeaderData, $offset, 16);
					$offset += 16;
					$thisfile_asf_headerextensionobject['reserved_1_guid']     = $this->BytestringToGUID($thisfile_asf_headerextensionobject['reserved_1']);
					if ($thisfile_asf_headerextensionobject['reserved_1'] != GETID3_ASF_Reserved_1) {
						$ThisFileInfo['warning'][] = 'header_extension_object.reserved_1 GUID ('.$this->BytestringToGUID($thisfile_asf_headerextensionobject['reserved_1']).') does not match expected "GETID3_ASF_Reserved_1" GUID ('.$this->BytestringToGUID(GETID3_ASF_Reserved_1).')';
						//return false;
						break;
					}
					$thisfile_asf_headerextensionobject['reserved_2']          = getid3_lib::LittleEndian2Int(substr($ASFHeaderData, $offset, 2));
					$offset += 2;
					if ($thisfile_asf_headerextensionobject['reserved_2'] != 6) {
						$ThisFileInfo['warning'][] = 'header_extension_object.reserved_2 ('.getid3_lib::PrintHexBytes($thisfile_asf_headerextensionobject['reserved_2']).') does not match expected value of "6"';
						//return false;
						break;
					}
					$thisfile_asf_headerextensionobject['extension_data_size'] = getid3_lib::LittleEndian2Int(substr($ASFHeaderData, $offset, 4));
					$offset += 4;
					$thisfile_asf_headerextensionobject['extension_data']      =                              substr($ASFHeaderData, $offset, $thisfile_asf_headerextensionobject['extension_data_size']);
					$offset += $thisfile_asf_headerextensionobject['extension_data_size'];
					break;

				case GETID3_ASF_Codec_List_Object:
					// Codec List Object: (optional, one only)
					// Field Name                   Field Type   Size (bits)
					// Object ID                    GUID         128             // GUID for Codec List object - GETID3_ASF_Codec_List_Object
					// Object Size                  QWORD        64              // size of Codec List object, including 44 bytes of Codec List Object header
					// Reserved                     GUID         128             // hardcoded: 86D15241-311D-11D0-A3A4-00A0C90348F6
					// Codec Entries Count          DWORD        32              // number of entries in Codec Entries array
					// Codec Entries                array of:    variable        //
					// * Type                       WORD         16              // 0x0001 = Video Codec, 0x0002 = Audio Codec, 0xFFFF = Unknown Codec
					// * Codec Name Length          WORD         16              // number of Unicode characters stored in the Codec Name field
					// * Codec Name                 WCHAR        variable        // array of Unicode characters - name of codec used to create the content
					// * Codec Description Length   WORD         16              // number of Unicode characters stored in the Codec Description field
					// * Codec Description          WCHAR        variable        // array of Unicode characters - description of format used to create the content
					// * Codec Information Length   WORD         16              // number of Unicode characters stored in the Codec Information field
					// * Codec Information          BYTESTREAM   variable        // opaque array of information bytes about the codec used to create the content

					// shortcut
					$thisfile_asf['codec_list_object'] = array();
					$thisfile_asf_codeclistobject      = &$thisfile_asf['codec_list_object'];

					$thisfile_asf_codeclistobject['objectid']                  = $NextObjectGUID;
					$thisfile_asf_codeclistobject['objectid_guid']             = $NextObjectGUIDtext;
					$thisfile_asf_codeclistobject['objectsize']                = $NextObjectSize;
					$thisfile_asf_codeclistobject['reserved']                  = substr($ASFHeaderData, $offset, 16);
					$offset += 16;
					$thisfile_asf_codeclistobject['reserved_guid']             = $this->BytestringToGUID($thisfile_asf_codeclistobject['reserved']);
					if ($thisfile_asf_codeclistobject['reserved'] != $this->GUIDtoBytestring('86D15241-311D-11D0-A3A4-00A0C90348F6')) {
						$ThisFileInfo['warning'][] = 'codec_list_object.reserved GUID {'.$this->BytestringToGUID($thisfile_asf_codeclistobject['reserved']).'} does not match expected "GETID3_ASF_Reserved_1" GUID {86D15241-311D-11D0-A3A4-00A0C90348F6}';
						//return false;
						break;
					}
					$thisfile_asf_codeclistobject['codec_entries_count'] = getid3_lib::LittleEndian2Int(substr($ASFHeaderData, $offset, 4));
					$offset += 4;
					for ($CodecEntryCounter = 0; $CodecEntryCounter < $thisfile_asf_codeclistobject['codec_entries_count']; $CodecEntryCounter++) {
						// shortcut
						$thisfile_asf_codeclistobject['codec_entries'][$CodecEntryCounter] = array();
						$thisfile_asf_codeclistobject_codecentries_current = &$thisfile_asf_codeclistobject['codec_entries'][$CodecEntryCounter];

						$thisfile_asf_codeclistobject_codecentries_current['type_raw'] = getid3_lib::LittleEndian2Int(substr($ASFHeaderData, $offset, 2));
						$offset += 2;
						$thisfile_asf_codeclistobject_codecentries_current['type'] = $this->ASFCodecListObjectTypeLookup($thisfile_asf_codeclistobject_codecentries_current['type_raw']);

						$CodecNameLength = getid3_lib::LittleEndian2Int(substr($ASFHeaderData, $offset, 2)) * 2; // 2 bytes per character
						$offset += 2;
						$thisfile_asf_codeclistobject_codecentries_current['name'] = substr($ASFHeaderData, $offset, $CodecNameLength);
						$offset += $CodecNameLength;

						$CodecDescriptionLength = getid3_lib::LittleEndian2Int(substr($ASFHeaderData, $offset, 2)) * 2; // 2 bytes per character
						$offset += 2;
						$thisfile_asf_codeclistobject_codecentries_current['description'] = substr($ASFHeaderData, $offset, $CodecDescriptionLength);
						$offset += $CodecDescriptionLength;

						$CodecInformationLength = getid3_lib::LittleEndian2Int(substr($ASFHeaderData, $offset, 2));
						$offset += 2;
						$thisfile_asf_codeclistobject_codecentries_current['information'] = substr($ASFHeaderData, $offset, $CodecInformationLength);
						$offset += $CodecInformationLength;

						if ($thisfile_asf_codeclistobject_codecentries_current['type_raw'] == 2) {
							// audio codec
							if (strpos($thisfile_asf_codeclistobject_codecentries_current['description'], ',') === false) {
								$ThisFileInfo['error'][] = '[asf][codec_list_object][codec_entries]['.$CodecEntryCounter.'][description] expected to contain comma-seperated list of parameters: "'.$thisfile_asf_codeclistobject_codecentries_current['description'].'"';
								return false;
							}
							list($AudioCodecBitrate, $AudioCodecFrequency, $AudioCodecChannels) = explode(',', $this->TrimConvert($thisfile_asf_codeclistobject_codecentries_current['description']));
							$thisfile_audio['codec'] = $this->TrimConvert($thisfile_asf_codeclistobject_codecentries_current['name']);

							if (!isset($thisfile_audio['bitrate']) && strstr($AudioCodecBitrate, 'kbps')) {
								$thisfile_audio['bitrate'] = (int) (trim(str_replace('kbps', '', $AudioCodecBitrate)) * 1000);
							}
							//if (!isset($thisfile_video['bitrate']) && isset($thisfile_audio['bitrate']) && isset($thisfile_asf['file_properties_object']['max_bitrate']) && ($thisfile_asf_codeclistobject['codec_entries_count'] > 1)) {
							if (!@$thisfile_video['bitrate'] && @$thisfile_audio['bitrate'] && @$ThisFileInfo['bitrate']) {
								//$thisfile_video['bitrate'] = $thisfile_asf['file_properties_object']['max_bitrate'] - $thisfile_audio['bitrate'];
								$thisfile_video['bitrate'] = $ThisFileInfo['bitrate'] - $thisfile_audio['bitrate'];
							}

							$AudioCodecFrequency = (int) trim(str_replace('kHz', '', $AudioCodecFrequency));
							switch ($AudioCodecFrequency) {
								case 8:
								case 8000:
									$thisfile_audio['sample_rate'] = 8000;
									break;

								case 11:
								case 11025:
									$thisfile_audio['sample_rate'] = 11025;
									break;

								case 12:
								case 12000:
									$thisfile_audio['sample_rate'] = 12000;
									break;

								case 16:
								case 16000:
									$thisfile_audio['sample_rate'] = 16000;
									break;

								case 22:
								case 22050:
									$thisfile_audio['sample_rate'] = 22050;
									break;

								case 24:
								case 24000:
									$thisfile_audio['sample_rate'] = 24000;
									break;

								case 32:
								case 32000:
									$thisfile_audio['sample_rate'] = 32000;
									break;

								case 44:
								case 441000:
									$thisfile_audio['sample_rate'] = 44100;
									break;

								case 48:
								case 48000:
									$thisfile_audio['sample_rate'] = 48000;
									break;

								default: