rlm@3: | rlm@3: // | Allan Hansen | rlm@3: // +----------------------------------------------------------------------+ rlm@3: // | module.graphic.png.php | rlm@3: // | Module for analyzing PNG graphic files. | rlm@3: // | dependencies: zlib support in PHP (optional) | rlm@3: // +----------------------------------------------------------------------+ rlm@3: // rlm@3: // $Id: module.graphic.png.php,v 1.4 2006/11/02 10:48:02 ah Exp $ rlm@3: rlm@3: rlm@3: rlm@3: class getid3_png extends getid3_handler rlm@3: { rlm@3: rlm@3: public function Analyze() { rlm@3: rlm@3: $getid3 = $this->getid3; rlm@3: rlm@3: $getid3->info['png'] = array (); rlm@3: $info_png = &$getid3->info['png']; rlm@3: rlm@3: $getid3->info['fileformat'] = 'png'; rlm@3: $getid3->info['video']['dataformat'] = 'png'; rlm@3: $getid3->info['video']['lossless'] = false; rlm@3: rlm@3: fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); rlm@3: $png_filedata = fread($getid3->fp, getid3::FREAD_BUFFER_SIZE); rlm@3: rlm@3: // Magic bytes "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A" rlm@3: rlm@3: $offset = 8; rlm@3: rlm@3: while (((ftell($getid3->fp) - (strlen($png_filedata) - $offset)) < $getid3->info['filesize'])) { rlm@3: rlm@3: $chunk['data_length'] = getid3_lib::BigEndian2Int(substr($png_filedata, $offset, 4)); rlm@3: $offset += 4; rlm@3: while (((strlen($png_filedata) - $offset) < ($chunk['data_length'] + 4)) && (ftell($getid3->fp) < $getid3->info['filesize'])) { rlm@3: $png_filedata .= fread($getid3->fp, getid3::FREAD_BUFFER_SIZE); rlm@3: } rlm@3: rlm@3: $chunk['type_text'] = substr($png_filedata, $offset, 4); rlm@3: $chunk['type_raw'] = getid3_lib::BigEndian2Int($chunk['type_text']); rlm@3: $offset += 4; rlm@3: rlm@3: $chunk['data'] = substr($png_filedata, $offset, $chunk['data_length']); rlm@3: $offset += $chunk['data_length']; rlm@3: rlm@3: $chunk['crc'] = getid3_lib::BigEndian2Int(substr($png_filedata, $offset, 4)); rlm@3: $offset += 4; rlm@3: rlm@3: $chunk['flags']['ancilliary'] = (bool)($chunk['type_raw'] & 0x20000000); rlm@3: $chunk['flags']['private'] = (bool)($chunk['type_raw'] & 0x00200000); rlm@3: $chunk['flags']['reserved'] = (bool)($chunk['type_raw'] & 0x00002000); rlm@3: $chunk['flags']['safe_to_copy'] = (bool)($chunk['type_raw'] & 0x00000020); rlm@3: rlm@3: // shortcut rlm@3: $info_png[$chunk['type_text']] = array (); rlm@3: $info_png_chunk_type_text = &$info_png[$chunk['type_text']]; rlm@3: rlm@3: switch ($chunk['type_text']) { rlm@3: rlm@3: case 'IHDR': // Image Header rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: $info_png_chunk_type_text['width'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)); rlm@3: $info_png_chunk_type_text['height'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)); rlm@3: rlm@3: getid3_lib::ReadSequence('BigEndian2Int', $info_png_chunk_type_text['raw'], $chunk['data'], 8, rlm@3: array ( rlm@3: 'bit_depth' => 1, rlm@3: 'color_type' => 1, rlm@3: 'compression_method' => 1, rlm@3: 'filter_method' => 1, rlm@3: 'interlace_method' => 1 rlm@3: ) rlm@3: ); rlm@3: rlm@3: $info_png_chunk_type_text['compression_method_text'] = getid3_png::PNGcompressionMethodLookup($info_png_chunk_type_text['raw']['compression_method']); rlm@3: $info_png_chunk_type_text['color_type']['palette'] = (bool)($info_png_chunk_type_text['raw']['color_type'] & 0x01); rlm@3: $info_png_chunk_type_text['color_type']['true_color'] = (bool)($info_png_chunk_type_text['raw']['color_type'] & 0x02); rlm@3: $info_png_chunk_type_text['color_type']['alpha'] = (bool)($info_png_chunk_type_text['raw']['color_type'] & 0x04); rlm@3: rlm@3: $getid3->info['video']['resolution_x'] = $info_png_chunk_type_text['width']; rlm@3: $getid3->info['video']['resolution_y'] = $info_png_chunk_type_text['height']; rlm@3: rlm@3: $getid3->info['video']['bits_per_sample'] = getid3_png::IHDRcalculateBitsPerSample($info_png_chunk_type_text['raw']['color_type'], $info_png_chunk_type_text['raw']['bit_depth']); rlm@3: break; rlm@3: rlm@3: rlm@3: case 'PLTE': // Palette rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: $palette_offset = 0; rlm@3: for ($i = 0; $i <= 255; $i++) { rlm@3: $red = @getid3_lib::BigEndian2Int($chunk['data']{$palette_offset++}); rlm@3: $green = @getid3_lib::BigEndian2Int($chunk['data']{$palette_offset++}); rlm@3: $blue = @getid3_lib::BigEndian2Int($chunk['data']{$palette_offset++}); rlm@3: $info_png_chunk_type_text[$i] = (($red << 16) | ($green << 8) | ($blue)); rlm@3: } rlm@3: break; rlm@3: rlm@3: rlm@3: case 'tRNS': // Transparency rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: switch ($info_png['IHDR']['raw']['color_type']) { rlm@3: case 0: rlm@3: $info_png_chunk_type_text['transparent_color_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2)); rlm@3: break; rlm@3: rlm@3: case 2: rlm@3: $info_png_chunk_type_text['transparent_color_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2)); rlm@3: $info_png_chunk_type_text['transparent_color_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 2)); rlm@3: $info_png_chunk_type_text['transparent_color_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 2)); rlm@3: break; rlm@3: rlm@3: case 3: rlm@3: for ($i = 0; $i < strlen($chunk['data']); $i++) { rlm@3: $info_png_chunk_type_text['palette_opacity'][$i] = getid3_lib::BigEndian2Int($chunk['data'][$i]); rlm@3: } rlm@3: break; rlm@3: rlm@3: case 4: rlm@3: case 6: rlm@3: throw new getid3_exception('Invalid color_type in tRNS chunk: '.$info_png['IHDR']['raw']['color_type']); rlm@3: rlm@3: default: rlm@3: $getid3->warning('Unhandled color_type in tRNS chunk: '.$info_png['IHDR']['raw']['color_type']); rlm@3: break; rlm@3: } rlm@3: break; rlm@3: rlm@3: rlm@3: case 'gAMA': // Image Gamma rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: $info_png_chunk_type_text['gamma'] = getid3_lib::BigEndian2Int($chunk['data']) / 100000; rlm@3: break; rlm@3: rlm@3: rlm@3: case 'cHRM': // Primary Chromaticities rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: $info_png_chunk_type_text['white_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)) / 100000; rlm@3: $info_png_chunk_type_text['white_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)) / 100000; rlm@3: $info_png_chunk_type_text['red_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 4)) / 100000; rlm@3: $info_png_chunk_type_text['red_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 12, 4)) / 100000; rlm@3: $info_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 16, 4)) / 100000; rlm@3: $info_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 20, 4)) / 100000; rlm@3: $info_png_chunk_type_text['blue_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 24, 4)) / 100000; rlm@3: $info_png_chunk_type_text['blue_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 28, 4)) / 100000; rlm@3: break; rlm@3: rlm@3: rlm@3: case 'sRGB': // Standard RGB Color Space rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: $info_png_chunk_type_text['reindering_intent'] = getid3_lib::BigEndian2Int($chunk['data']); rlm@3: $info_png_chunk_type_text['reindering_intent_text'] = getid3_png::PNGsRGBintentLookup($info_png_chunk_type_text['reindering_intent']); rlm@3: break; rlm@3: rlm@3: rlm@3: case 'iCCP': // Embedded ICC Profile rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: list($profilename, $compressiondata) = explode("\x00", $chunk['data'], 2); rlm@3: $info_png_chunk_type_text['profile_name'] = $profilename; rlm@3: $info_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int($compressiondata[0]); rlm@3: $info_png_chunk_type_text['compression_profile'] = substr($compressiondata, 1); rlm@3: $info_png_chunk_type_text['compression_method_text'] = getid3_png::PNGcompressionMethodLookup($info_png_chunk_type_text['compression_method']); rlm@3: break; rlm@3: rlm@3: rlm@3: case 'tEXt': // Textual Data rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: list($keyword, $text) = explode("\x00", $chunk['data'], 2); rlm@3: $info_png_chunk_type_text['keyword'] = $keyword; rlm@3: $info_png_chunk_type_text['text'] = $text; rlm@3: rlm@3: $info_png['comments'][$info_png_chunk_type_text['keyword']][] = $info_png_chunk_type_text['text']; rlm@3: break; rlm@3: rlm@3: rlm@3: case 'zTXt': // Compressed Textual Data rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: list($keyword, $otherdata) = explode("\x00", $chunk['data'], 2); rlm@3: $info_png_chunk_type_text['keyword'] = $keyword; rlm@3: $info_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int(substr($otherdata, 0, 1)); rlm@3: $info_png_chunk_type_text['compressed_text'] = substr($otherdata, 1); rlm@3: $info_png_chunk_type_text['compression_method_text'] = getid3_png::PNGcompressionMethodLookup($info_png_chunk_type_text['compression_method']); rlm@3: rlm@3: if ($info_png_chunk_type_text['compression_method'] != 0) { rlm@3: // unknown compression method rlm@3: break; rlm@3: } rlm@3: rlm@3: if (function_exists('gzuncompress')) { rlm@3: $info_png_chunk_type_text['text'] = gzuncompress($info_png_chunk_type_text['compressed_text']); rlm@3: } rlm@3: else { rlm@3: if (!@$this->zlib_warning) { rlm@3: $getid3->warning('PHP does not have --with-zlib support - cannot gzuncompress()'); rlm@3: } rlm@3: $this->zlib_warning = true; rlm@3: } rlm@3: rlm@3: rlm@3: if (isset($info_png_chunk_type_text['text'])) { rlm@3: $info_png['comments'][$info_png_chunk_type_text['keyword']][] = $info_png_chunk_type_text['text']; rlm@3: } rlm@3: break; rlm@3: rlm@3: rlm@3: case 'iTXt': // International Textual Data rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: list($keyword, $otherdata) = explode("\x00", $chunk['data'], 2); rlm@3: $info_png_chunk_type_text['keyword'] = $keyword; rlm@3: $info_png_chunk_type_text['compression'] = (bool)getid3_lib::BigEndian2Int(substr($otherdata, 0, 1)); rlm@3: $info_png_chunk_type_text['compression_method'] = getid3_lib::BigEndian2Int($otherdata[1]); rlm@3: $info_png_chunk_type_text['compression_method_text'] = getid3_png::PNGcompressionMethodLookup($info_png_chunk_type_text['compression_method']); rlm@3: list($languagetag, $translatedkeyword, $text) = explode("\x00", substr($otherdata, 2), 3); rlm@3: $info_png_chunk_type_text['language_tag'] = $languagetag; rlm@3: $info_png_chunk_type_text['translated_keyword'] = $translatedkeyword; rlm@3: rlm@3: if ($info_png_chunk_type_text['compression']) { rlm@3: rlm@3: switch ($info_png_chunk_type_text['compression_method']) { rlm@3: case 0: rlm@3: if (function_exists('gzuncompress')) { rlm@3: $info_png_chunk_type_text['text'] = gzuncompress($text); rlm@3: } rlm@3: else { rlm@3: if (!@$this->zlib_warning) { rlm@3: $getid3->warning('PHP does not have --with-zlib support - cannot gzuncompress()'); rlm@3: } rlm@3: $this->zlib_warning = true; rlm@3: } rlm@3: break; rlm@3: rlm@3: default: rlm@3: // unknown compression method rlm@3: break; rlm@3: } rlm@3: rlm@3: } else { rlm@3: rlm@3: $info_png_chunk_type_text['text'] = $text; rlm@3: rlm@3: } rlm@3: rlm@3: if (isset($info_png_chunk_type_text['text'])) { rlm@3: $info_png['comments'][$info_png_chunk_type_text['keyword']][] = $info_png_chunk_type_text['text']; rlm@3: } rlm@3: break; rlm@3: rlm@3: rlm@3: case 'bKGD': // Background Color rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: switch ($info_png['IHDR']['raw']['color_type']) { rlm@3: case 0: rlm@3: case 4: rlm@3: $info_png_chunk_type_text['background_gray'] = getid3_lib::BigEndian2Int($chunk['data']); rlm@3: break; rlm@3: rlm@3: case 2: rlm@3: case 6: rlm@3: $info_png_chunk_type_text['background_red'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0 * $info_png['IHDR']['raw']['bit_depth'], $info_png['IHDR']['raw']['bit_depth'])); rlm@3: $info_png_chunk_type_text['background_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1 * $info_png['IHDR']['raw']['bit_depth'], $info_png['IHDR']['raw']['bit_depth'])); rlm@3: $info_png_chunk_type_text['background_blue'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2 * $info_png['IHDR']['raw']['bit_depth'], $info_png['IHDR']['raw']['bit_depth'])); rlm@3: break; rlm@3: rlm@3: case 3: rlm@3: $info_png_chunk_type_text['background_index'] = getid3_lib::BigEndian2Int($chunk['data']); rlm@3: break; rlm@3: rlm@3: default: rlm@3: break; rlm@3: } rlm@3: break; rlm@3: rlm@3: rlm@3: case 'pHYs': // Physical Pixel Dimensions rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: $info_png_chunk_type_text['pixels_per_unit_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)); rlm@3: $info_png_chunk_type_text['pixels_per_unit_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)); rlm@3: $info_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1)); rlm@3: $info_png_chunk_type_text['unit'] = getid3_png::PNGpHYsUnitLookup($info_png_chunk_type_text['unit_specifier']); rlm@3: break; rlm@3: rlm@3: rlm@3: case 'sBIT': // Significant Bits rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: switch ($info_png['IHDR']['raw']['color_type']) { rlm@3: case 0: rlm@3: $info_png_chunk_type_text['significant_bits_gray'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); rlm@3: break; rlm@3: rlm@3: case 2: rlm@3: case 3: rlm@3: $info_png_chunk_type_text['significant_bits_red'] = getid3_lib::BigEndian2Int($chunk['data'][0]); rlm@3: $info_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int($chunk['data'][1]); rlm@3: $info_png_chunk_type_text['significant_bits_blue'] = getid3_lib::BigEndian2Int($chunk['data'][2]); rlm@3: break; rlm@3: rlm@3: case 4: rlm@3: $info_png_chunk_type_text['significant_bits_gray'] = getid3_lib::BigEndian2Int($chunk['data'][0]); rlm@3: $info_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int($chunk['data'][1]); rlm@3: break; rlm@3: rlm@3: case 6: rlm@3: $info_png_chunk_type_text['significant_bits_red'] = getid3_lib::BigEndian2Int($chunk['data'][0]); rlm@3: $info_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int($chunk['data'][1]); rlm@3: $info_png_chunk_type_text['significant_bits_blue'] = getid3_lib::BigEndian2Int($chunk['data'][2]); rlm@3: $info_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int($chunk['data'][3]); rlm@3: break; rlm@3: rlm@3: default: rlm@3: break; rlm@3: } rlm@3: break; rlm@3: rlm@3: rlm@3: case 'sPLT': // Suggested Palette rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: rlm@3: list($palettename, $otherdata) = explode("\x00", $chunk['data'], 2); rlm@3: $info_png_chunk_type_text['palette_name'] = $palettename; rlm@3: rlm@3: $info_png_chunk_type_text['sample_depth_bits'] = getid3_lib::BigEndian2Int($otherdata[0]); rlm@3: $info_png_chunk_type_text['sample_depth_bytes'] = $info_png_chunk_type_text['sample_depth_bits'] / 8; rlm@3: rlm@3: $s_plt_offset = 1; rlm@3: $paletteCounter = 0; rlm@3: while ($s_plt_offset < strlen($otherdata)) { rlm@3: rlm@3: $info_png_chunk_type_text['red'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $s_plt_offset, $info_png_chunk_type_text['sample_depth_bytes'])); rlm@3: $s_plt_offset += $info_png_chunk_type_text['sample_depth_bytes']; rlm@3: rlm@3: $info_png_chunk_type_text['green'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $s_plt_offset, $info_png_chunk_type_text['sample_depth_bytes'])); rlm@3: $s_plt_offset += $info_png_chunk_type_text['sample_depth_bytes']; rlm@3: rlm@3: $info_png_chunk_type_text['blue'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $s_plt_offset, $info_png_chunk_type_text['sample_depth_bytes'])); rlm@3: $s_plt_offset += $info_png_chunk_type_text['sample_depth_bytes']; rlm@3: rlm@3: $info_png_chunk_type_text['alpha'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $s_plt_offset, $info_png_chunk_type_text['sample_depth_bytes'])); rlm@3: $s_plt_offset += $info_png_chunk_type_text['sample_depth_bytes']; rlm@3: rlm@3: $info_png_chunk_type_text['frequency'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $s_plt_offset, 2)); rlm@3: $s_plt_offset += 2; rlm@3: rlm@3: $paletteCounter++; rlm@3: } rlm@3: break; rlm@3: rlm@3: rlm@3: case 'hIST': // Palette Histogram rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: $h_ist_counter = 0; rlm@3: while ($h_ist_counter < strlen($chunk['data'])) { rlm@3: $info_png_chunk_type_text[$h_ist_counter] = getid3_lib::BigEndian2Int(substr($chunk['data'], $h_ist_counter / 2, 2)); rlm@3: $h_ist_counter += 2; rlm@3: } rlm@3: break; rlm@3: rlm@3: rlm@3: case 'tIME': // Image Last-Modification Time rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: $info_png_chunk_type_text['year'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2)); rlm@3: $info_png_chunk_type_text['month'] = getid3_lib::BigEndian2Int($chunk['data']{2}); rlm@3: $info_png_chunk_type_text['day'] = getid3_lib::BigEndian2Int($chunk['data']{3}); rlm@3: $info_png_chunk_type_text['hour'] = getid3_lib::BigEndian2Int($chunk['data']{4}); rlm@3: $info_png_chunk_type_text['minute'] = getid3_lib::BigEndian2Int($chunk['data']{5}); rlm@3: $info_png_chunk_type_text['second'] = getid3_lib::BigEndian2Int($chunk['data']{6}); rlm@3: $info_png_chunk_type_text['unix'] = gmmktime($info_png_chunk_type_text['hour'], $info_png_chunk_type_text['minute'], $info_png_chunk_type_text['second'], $info_png_chunk_type_text['month'], $info_png_chunk_type_text['day'], $info_png_chunk_type_text['year']); rlm@3: break; rlm@3: rlm@3: rlm@3: case 'oFFs': // Image Offset rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: $info_png_chunk_type_text['position_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4), false, true); rlm@3: $info_png_chunk_type_text['position_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4), false, true); rlm@3: $info_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int($chunk['data'][8]); rlm@3: $info_png_chunk_type_text['unit'] = getid3_png::PNGoFFsUnitLookup($info_png_chunk_type_text['unit_specifier']); rlm@3: break; rlm@3: rlm@3: rlm@3: case 'pCAL': // Calibration Of Pixel Values rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: list($calibrationname, $otherdata) = explode("\x00", $chunk['data'], 2); rlm@3: $info_png_chunk_type_text['calibration_name'] = $calibrationname; rlm@3: $info_png_chunk_type_text['original_zero'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4), false, true); rlm@3: $info_png_chunk_type_text['original_max'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4), false, true); rlm@3: $info_png_chunk_type_text['equation_type'] = getid3_lib::BigEndian2Int($chunk['data'][8]); rlm@3: $info_png_chunk_type_text['equation_type_text'] = getid3_png::PNGpCALequationTypeLookup($info_png_chunk_type_text['equation_type']); rlm@3: $info_png_chunk_type_text['parameter_count'] = getid3_lib::BigEndian2Int($chunk['data'][9]); rlm@3: $info_png_chunk_type_text['parameters'] = explode("\x00", substr($chunk['data'], 10)); rlm@3: break; rlm@3: rlm@3: rlm@3: case 'sCAL': // Physical Scale Of Image Subject rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: $info_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1)); rlm@3: $info_png_chunk_type_text['unit'] = getid3_png::PNGsCALUnitLookup($info_png_chunk_type_text['unit_specifier']); rlm@3: list($info_png_chunk_type_text['pixel_width'], $info_png_chunk_type_text['pixel_height']) = explode("\x00", substr($chunk['data'], 1)); rlm@3: break; rlm@3: rlm@3: rlm@3: case 'gIFg': // GIF Graphic Control Extension rlm@3: $gIFg_counter = 0; rlm@3: if (isset($info_png_chunk_type_text) && is_array($info_png_chunk_type_text)) { rlm@3: $gIFg_counter = count($info_png_chunk_type_text); rlm@3: } rlm@3: $info_png_chunk_type_text[$gIFg_counter]['header'] = $chunk; rlm@3: $info_png_chunk_type_text[$gIFg_counter]['disposal_method'] = getid3_lib::BigEndian2Int($chunk['data'][0]); rlm@3: $info_png_chunk_type_text[$gIFg_counter]['user_input_flag'] = getid3_lib::BigEndian2Int($chunk['data'][1]); rlm@3: $info_png_chunk_type_text[$gIFg_counter]['delay_time'] = getid3_lib::BigEndian2Int($chunk['data'][2]); rlm@3: break; rlm@3: rlm@3: rlm@3: case 'gIFx': // GIF Application Extension rlm@3: $gIFx_counter = 0; rlm@3: if (isset($info_png_chunk_type_text) && is_array($info_png_chunk_type_text)) { rlm@3: $gIFx_counter = count($info_png_chunk_type_text); rlm@3: } rlm@3: $info_png_chunk_type_text[$gIFx_counter]['header'] = $chunk; rlm@3: $info_png_chunk_type_text[$gIFx_counter]['application_identifier'] = substr($chunk['data'], 0, 8); rlm@3: $info_png_chunk_type_text[$gIFx_counter]['authentication_code'] = substr($chunk['data'], 8, 3); rlm@3: $info_png_chunk_type_text[$gIFx_counter]['application_data'] = substr($chunk['data'], 11); rlm@3: break; rlm@3: rlm@3: rlm@3: case 'IDAT': // Image Data rlm@3: $idat_information_field_index = 0; rlm@3: if (isset($info_png['IDAT']) && is_array($info_png['IDAT'])) { rlm@3: $idat_information_field_index = count($info_png['IDAT']); rlm@3: } rlm@3: unset($chunk['data']); rlm@3: $info_png_chunk_type_text[$idat_information_field_index]['header'] = $chunk; rlm@3: break; rlm@3: rlm@3: rlm@3: case 'IEND': // Image Trailer rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: break; rlm@3: rlm@3: rlm@3: default: rlm@3: $info_png_chunk_type_text['header'] = $chunk; rlm@3: $getid3->warning('Unhandled chunk type: '.$chunk['type_text']); rlm@3: break; rlm@3: } rlm@3: } rlm@3: rlm@3: return true; rlm@3: } rlm@3: rlm@3: rlm@3: rlm@3: public static function PNGsRGBintentLookup($sRGB) { rlm@3: rlm@3: static $lookup = array ( rlm@3: 0 => 'Perceptual', rlm@3: 1 => 'Relative colorimetric', rlm@3: 2 => 'Saturation', rlm@3: 3 => 'Absolute colorimetric' rlm@3: ); rlm@3: return (isset($lookup[$sRGB]) ? $lookup[$sRGB] : 'invalid'); rlm@3: } rlm@3: rlm@3: rlm@3: rlm@3: public static function PNGcompressionMethodLookup($compression_method) { rlm@3: rlm@3: return ($compression_method == 0 ? 'deflate/inflate' : 'invalid'); rlm@3: } rlm@3: rlm@3: rlm@3: rlm@3: public static function PNGpHYsUnitLookup($unit_id) { rlm@3: rlm@3: static $lookup = array ( rlm@3: 0 => 'unknown', rlm@3: 1 => 'meter' rlm@3: ); rlm@3: return (isset($lookup[$unit_id]) ? $lookup[$unit_id] : 'invalid'); rlm@3: } rlm@3: rlm@3: rlm@3: rlm@3: public static function PNGoFFsUnitLookup($unit_id) { rlm@3: rlm@3: static $lookup = array ( rlm@3: 0 => 'pixel', rlm@3: 1 => 'micrometer' rlm@3: ); rlm@3: return (isset($lookup[$unit_id]) ? $lookup[$unit_id] : 'invalid'); rlm@3: } rlm@3: rlm@3: rlm@3: rlm@3: public static function PNGpCALequationTypeLookup($equation_type) { rlm@3: rlm@3: static $lookup = array ( rlm@3: 0 => 'Linear mapping', rlm@3: 1 => 'Base-e exponential mapping', rlm@3: 2 => 'Arbitrary-base exponential mapping', rlm@3: 3 => 'Hyperbolic mapping' rlm@3: ); rlm@3: return (isset($lookup[$equation_type]) ? $lookup[$equation_type] : 'invalid'); rlm@3: } rlm@3: rlm@3: rlm@3: rlm@3: public static function PNGsCALUnitLookup($unit_id) { rlm@3: rlm@3: static $lookup = array ( rlm@3: 0 => 'meter', rlm@3: 1 => 'radian' rlm@3: ); rlm@3: return (isset($lookup[$unit_id]) ? $lookup[$unit_id] : 'invalid'); rlm@3: } rlm@3: rlm@3: rlm@3: rlm@3: public static function IHDRcalculateBitsPerSample($color_type, $bit_depth) { rlm@3: rlm@3: switch ($color_type) { rlm@3: case 0: // Each pixel is a grayscale sample. rlm@3: return $bit_depth; rlm@3: rlm@3: case 2: // Each pixel is an R,G,B triple rlm@3: return 3 * $bit_depth; rlm@3: rlm@3: case 3: // Each pixel is a palette index; a PLTE chunk must appear. rlm@3: return $bit_depth; rlm@3: rlm@3: case 4: // Each pixel is a grayscale sample, followed by an alpha sample. rlm@3: return 2 * $bit_depth; rlm@3: rlm@3: case 6: // Each pixel is an R,G,B triple, followed by an alpha sample. rlm@3: return 4 * $bit_depth; rlm@3: } rlm@3: return false; rlm@3: } rlm@3: rlm@3: } rlm@3: rlm@3: rlm@3: ?>