module.audio-video.riff.php

一个用PHP编写的

									// shortcut
									$thisfile_riff_raw_strf_strhfccType_streamindex = &$thisfile_riff_raw['strf'][$strhfccType][$streamindex];

									switch ($strhfccType) {
										case 'auds':
											$thisfile_audio['bitrate_mode'] = 'cbr';
											$thisfile_audio_dataformat      = 'wav';
											if (isset($thisfile_riff_audio) && is_array($thisfile_riff_audio)) {
												$streamindex = count($thisfile_riff_audio);
											}

											$thisfile_riff_audio[$streamindex] = getid3_riff::RIFFparseWAVEFORMATex($strfData);
											$thisfile_audio['wformattag'] = $thisfile_riff_audio[$streamindex]['raw']['wFormatTag'];

											// shortcut
											$thisfile_audio['streams'][$streamindex] = $thisfile_riff_audio[$streamindex];
											$thisfile_audio_streams_currentstream = &$thisfile_audio['streams'][$streamindex];

											if ($thisfile_audio_streams_currentstream['bits_per_sample'] == 0) {
												unset($thisfile_audio_streams_currentstream['bits_per_sample']);
											}
											$thisfile_audio_streams_currentstream['wformattag'] = $thisfile_audio_streams_currentstream['raw']['wFormatTag'];
											unset($thisfile_audio_streams_currentstream['raw']);

											// shortcut
											$thisfile_riff_raw['strf'][$strhfccType][$streamindex] = $thisfile_riff_audio[$streamindex]['raw'];

											unset($thisfile_riff_audio[$streamindex]['raw']);
											$thisfile_audio = getid3_lib::array_merge_noclobber($thisfile_audio, $thisfile_riff_audio[$streamindex]);

											$thisfile_audio['lossless'] = false;
											switch ($thisfile_riff_raw_strf_strhfccType_streamindex['wFormatTag']) {
												case 0x0001:  // PCM
													$thisfile_audio_dataformat  = 'wav';
													$thisfile_audio['lossless'] = true;
													break;

												case 0x0050: // MPEG Layer 2 or Layer 1
													$thisfile_audio_dataformat = 'mp2'; // Assume Layer-2
													break;

												case 0x0055: // MPEG Layer 3
													$thisfile_audio_dataformat = 'mp3';
													break;

												case 0x00FF: // AAC
													$thisfile_audio_dataformat = 'aac';
													break;

												case 0x0161: // Windows Media v7 / v8 / v9
												case 0x0162: // Windows Media Professional v9
												case 0x0163: // Windows Media Lossess v9
													$thisfile_audio_dataformat = 'wma';
													break;

												case 0x2000: // AC-3
													$thisfile_audio_dataformat = 'ac3';
													break;

												case 0x2001: // DTS
													$thisfile_audio_dataformat = 'dts';
													break;

												default:
													$thisfile_audio_dataformat = 'wav';
													break;
											}
											$thisfile_audio_streams_currentstream['dataformat']   = $thisfile_audio_dataformat;
											$thisfile_audio_streams_currentstream['lossless']     = $thisfile_audio['lossless'];
											$thisfile_audio_streams_currentstream['bitrate_mode'] = $thisfile_audio['bitrate_mode'];
											break;


										case 'iavs':
										case 'vids':
											// shortcut
											$thisfile_riff_raw['strh'][$i]                  = array();
											$thisfile_riff_raw_strh_current                 = &$thisfile_riff_raw['strh'][$i];

											$thisfile_riff_raw_strh_current['fccType']               =                  substr($strhData,  0, 4);  // same as $strhfccType;
											$thisfile_riff_raw_strh_current['fccHandler']            =                  substr($strhData,  4, 4);
											$thisfile_riff_raw_strh_current['dwFlags']               = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strhData,  8, 4)); // Contains AVITF_* flags
											$thisfile_riff_raw_strh_current['wPriority']             = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strhData, 12, 2));
											$thisfile_riff_raw_strh_current['wLanguage']             = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strhData, 14, 2));
											$thisfile_riff_raw_strh_current['dwInitialFrames']       = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strhData, 16, 4));
											$thisfile_riff_raw_strh_current['dwScale']               = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strhData, 20, 4));
											$thisfile_riff_raw_strh_current['dwRate']                = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strhData, 24, 4));
											$thisfile_riff_raw_strh_current['dwStart']               = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strhData, 28, 4));
											$thisfile_riff_raw_strh_current['dwLength']              = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strhData, 32, 4));
											$thisfile_riff_raw_strh_current['dwSuggestedBufferSize'] = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strhData, 36, 4));
											$thisfile_riff_raw_strh_current['dwQuality']             = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strhData, 40, 4));
											$thisfile_riff_raw_strh_current['dwSampleSize']          = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strhData, 44, 4));
											$thisfile_riff_raw_strh_current['rcFrame']               = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strhData, 48, 4));

											$thisfile_riff_video_current['codec'] = getid3_riff::RIFFfourccLookup($thisfile_riff_raw_strh_current['fccHandler']);
											$thisfile_video['fourcc']             = $thisfile_riff_raw_strh_current['fccHandler'];
											if (!$thisfile_riff_video_current['codec'] && isset($thisfile_riff_raw_strf_strhfccType_streamindex['fourcc']) && getid3_riff::RIFFfourccLookup($thisfile_riff_raw_strf_strhfccType_streamindex['fourcc'])) {
												$thisfile_riff_video_current['codec'] = getid3_riff::RIFFfourccLookup($thisfile_riff_raw_strf_strhfccType_streamindex['fourcc']);
												$thisfile_video['fourcc']             = $thisfile_riff_raw_strf_strhfccType_streamindex['fourcc'];
											}
											$thisfile_video['codec']              = $thisfile_riff_video_current['codec'];
											$thisfile_video['pixel_aspect_ratio'] = (float) 1;
											switch ($thisfile_riff_raw_strh_current['fccHandler']) {
												case 'HFYU': // Huffman Lossless Codec
												case 'IRAW': // Intel YUV Uncompressed
												case 'YUY2': // Uncompressed YUV 4:2:2
													$thisfile_video['lossless'] = true;
													break;

												default:
													$thisfile_video['lossless'] = false;
													break;
											}

											switch ($strhfccType) {
												case 'vids':
													$thisfile_riff_raw_strf_strhfccType_streamindex['biSize']          = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strfData,  0, 4)); // number of bytes required by the BITMAPINFOHEADER structure
													$thisfile_riff_raw_strf_strhfccType_streamindex['biWidth']         = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strfData,  4, 4)); // width of the bitmap in pixels
													$thisfile_riff_raw_strf_strhfccType_streamindex['biHeight']        = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strfData,  8, 4)); // height of the bitmap in pixels. If biHeight is positive, the bitmap is a 'bottom-up' DIB and its origin is the lower left corner. If biHeight is negative, the bitmap is a 'top-down' DIB and its origin is the upper left corner
													$thisfile_riff_raw_strf_strhfccType_streamindex['biPlanes']        = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strfData, 12, 2)); // number of color planes on the target device. In most cases this value must be set to 1
													$thisfile_riff_raw_strf_strhfccType_streamindex['biBitCount']      = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strfData, 14, 2)); // Specifies the number of bits per pixels
													$thisfile_riff_raw_strf_strhfccType_streamindex['fourcc']          =                                 substr($strfData, 16, 4);  //
													$thisfile_riff_raw_strf_strhfccType_streamindex['biSizeImage']     = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strfData, 20, 4)); // size of the bitmap data section of the image (the actual pixel data, excluding BITMAPINFOHEADER and RGBQUAD structures)
													$thisfile_riff_raw_strf_strhfccType_streamindex['biXPelsPerMeter'] = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strfData, 24, 4)); // horizontal resolution, in pixels per metre, of the target device
													$thisfile_riff_raw_strf_strhfccType_streamindex['biYPelsPerMeter'] = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strfData, 28, 4)); // vertical resolution, in pixels per metre, of the target device
													$thisfile_riff_raw_strf_strhfccType_streamindex['biClrUsed']       = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strfData, 32, 4)); // actual number of color indices in the color table used by the bitmap. If this value is zero, the bitmap uses the maximum number of colors corresponding to the value of the biBitCount member for the compression mode specified by biCompression
													$thisfile_riff_raw_strf_strhfccType_streamindex['biClrImportant']  = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($strfData, 36, 4)); // number of color indices that are considered important for displaying the bitmap. If this value is zero, all colors are important

													$thisfile_video['bits_per_sample'] = $thisfile_riff_raw_strf_strhfccType_streamindex['biBitCount'];

													if ($thisfile_riff_video_current['codec'] == 'DV') {
														$thisfile_riff_video_current['dv_type'] = 2;
													}
													break;

												case 'iavs':
													$thisfile_riff_video_current['dv_type'] = 1;
													break;
											}
											break;

										default:
											$ThisFileInfo['warning'][] = 'Unhandled fccType for stream ('.$i.'): "'.$strhfccType.'"';
											break;

									}
								}
							}

							if (isset($thisfile_riff_raw_strf_strhfccType_streamindex['fourcc']) && getid3_riff::RIFFfourccLookup($thisfile_riff_raw_strf_strhfccType_streamindex['fourcc'])) {

								$thisfile_riff_video_current['codec'] = getid3_riff::RIFFfourccLookup($thisfile_riff_raw_strf_strhfccType_streamindex['fourcc']);
								$thisfile_video['codec']              = $thisfile_riff_video_current['codec'];
								$thisfile_video['fourcc']             = $thisfile_riff_raw_strf_strhfccType_streamindex['fourcc'];

								switch ($thisfile_riff_raw_strf_strhfccType_streamindex['fourcc']) {
									case 'HFYU': // Huffman Lossless Codec
									case 'IRAW': // Intel YUV Uncompressed
									case 'YUY2': // Uncompressed YUV 4:2:2
										$thisfile_video['lossless']        = true;
										$thisfile_video['bits_per_sample'] = 24;
										break;

									default:
										$thisfile_video['lossless']        = false;
										$thisfile_video['bits_per_sample'] = 24;
										break;
								}

							}
						}
					}
				}
				break;

			case 'CDDA':
				$thisfile_audio['bitrate_mode'] = 'cbr';
				$thisfile_audio_dataformat      = 'cda';
				$thisfile_audio['lossless']     = true;
				unset($ThisFileInfo['mime_type']);

				$thisfile_avdataoffset = 44;

				if (isset($thisfile_riff['CDDA']['fmt '][0]['data'])) {
					// shortcut
					$thisfile_riff_CDDA_fmt_0 = &$thisfile_riff['CDDA']['fmt '][0];

					$thisfile_riff_CDDA_fmt_0['unknown1']           = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($thisfile_riff_CDDA_fmt_0['data'],  0, 2));
					$thisfile_riff_CDDA_fmt_0['track_num']          = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($thisfile_riff_CDDA_fmt_0['data'],  2, 2));
					$thisfile_riff_CDDA_fmt_0['disc_id']            = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($thisfile_riff_CDDA_fmt_0['data'],  4, 4));
					$thisfile_riff_CDDA_fmt_0['start_offset_frame'] = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($thisfile_riff_CDDA_fmt_0['data'],  8, 4));
					$thisfile_riff_CDDA_fmt_0['playtime_frames']    = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($thisfile_riff_CDDA_fmt_0['data'], 12, 4));
					$thisfile_riff_CDDA_fmt_0['unknown6']           = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($thisfile_riff_CDDA_fmt_0['data'], 16, 4));
					$thisfile_riff_CDDA_fmt_0['unknown7']           = getid3_riff::EitherEndian2Int($ThisFileInfo, substr($thisfile_riff_CDDA_fmt_0['data'], 20, 4));

					$thisfile_riff_CDDA_fmt_0['start_offset_seconds'] = (float) $thisfile_riff_CDDA_fmt_0['start_offset_frame'] / 75;
					$thisfile_riff_CDDA_fmt_0['playtime_seconds']     = (float) $thisfile_riff_CDDA_fmt_0['playtime_frames'] / 75;
					$ThisFileInfo['comments']['track']                = $thisfile_riff_CDDA_fmt_0['track_num'];
					$ThisFileInfo['playtime_seconds']                 = $thisfile_riff_CDDA_fmt_0['playtime_seconds'];

					// hardcoded data for CD-audio
					$thisfile_audio['sample_rate']     = 44100;
					$thisfile_audio['channels']        = 2;
					$thisfile_audio['bits_per_sample'] = 16;
					$thisfile_audio['bitrate']         = $thisfile_audio['sample_rate'] * $thisfile_audio['channels'] * $thisfile_audio['bits_per_sample'];
					$thisfile_audio['bitrate_mode']    = 'cbr';
				}
				break;


			case 'AIFF':
			case 'AIFC':
				$thisfile_audio['bitrate_mode'] = 'cbr';
				$thisfile_audio_dataformat      = 'aiff';
				$thisfile_audio['lossless']     = true;
				$ThisFileInfo['mime_type']      = 'audio/x-aiff';

				if (isset($thisfile_riff[$RIFFsubtype]['SSND'][0]['offset'])) {
					$thisfile_avdataoffset = $thisfile_riff[$RIFFsubtype]['SSND'][0]['offset'] + 8;
					$thisfile_avdataend    = $thisfile_avdataoffset + $thisfile_riff[$RIFFsubtype]['SSND'][0]['size'];
					if ($thisfile_avdataend > $ThisFileInfo['filesize']) {
						if (($thisfile_avdataend == ($ThisFileInfo['filesize'] + 1)) && (($ThisFileInfo['filesize'] % 2) == 1)) {
							// structures rounded to 2-byte boundary, but dumb encoders
							// forget to pad end of file to make this actually work
						} else {
							$ThisFileInfo['warning'][] = 'Probable truncated AIFF file: expecting '.$thisfile_riff[$RIFFsubtype]['SSND'][0]['size'].' bytes of audio data, only '.($ThisFileInfo['filesize'] - $thisfile_avdataoffset).' bytes found';
						}
						$thisfile_avdataend = $ThisFileInfo['filesize'];
					}
				}

				if (isset($thisfile_riff[$RIFFsubtype]['COMM'][0]['data'])) {

					// shortcut
					$thisfile_riff_RIFFsubtype_COMM_0_data = &$thisfile_riff[$RIFFsubtype]['COMM'][0]['data'];

					$thisfile_riff_audio['channels']         =         getid3_lib::BigEndian2Int(substr($thisfile_riff_RIFFsubtype_COMM_0_data,  0,  2), true);