<?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.graphic.gif.php //
// ///
/////////////////////////////////////////////////////////////////
-
+/**
+ * @link https://www.w3.org/Graphics/GIF/spec-gif89a.txt
+ * @link http://www.matthewflickinger.com/lab/whatsinagif/bits_and_bytes.asp
+ */
class getid3_gif extends getid3_handler
{
-
+ /**
+ * @return bool
+ */
public function Analyze() {
$info = &$this->getid3->info;
$info['gif']['header']['aspect_ratio'] = ($info['gif']['header']['raw']['aspect_ratio'] + 15) / 64;
}
-// if ($info['gif']['header']['flags']['global_color_table']) {
-// $GIFcolorTable = $this->fread(3 * $info['gif']['header']['global_color_size']);
-// $offset = 0;
-// for ($i = 0; $i < $info['gif']['header']['global_color_size']; $i++) {
-// $red = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
-// $green = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
-// $blue = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
-// $info['gif']['global_color_table'][$i] = (($red << 16) | ($green << 8) | ($blue));
-// }
-// }
-//
-// // Image Descriptor
-// while (!feof($this->getid3->fp)) {
-// $NextBlockTest = $this->fread(1);
-// switch ($NextBlockTest) {
-//
-// case ',': // ',' - Image separator character
-//
-// $ImageDescriptorData = $NextBlockTest.$this->fread(9);
-// $ImageDescriptor = array();
-// $ImageDescriptor['image_left'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 1, 2));
-// $ImageDescriptor['image_top'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 3, 2));
-// $ImageDescriptor['image_width'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 5, 2));
-// $ImageDescriptor['image_height'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 7, 2));
-// $ImageDescriptor['flags_raw'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 9, 1));
-// $ImageDescriptor['flags']['use_local_color_map'] = (bool) ($ImageDescriptor['flags_raw'] & 0x80);
-// $ImageDescriptor['flags']['image_interlaced'] = (bool) ($ImageDescriptor['flags_raw'] & 0x40);
-// $info['gif']['image_descriptor'][] = $ImageDescriptor;
-//
-// if ($ImageDescriptor['flags']['use_local_color_map']) {
-//
-// $this->warning('This version of getID3() cannot parse local color maps for GIFs');
-// return true;
-//
-// }
-//echo 'Start of raster data: '.$this->ftell().'<BR>';
-// $RasterData = array();
-// $RasterData['code_size'] = getid3_lib::LittleEndian2Int($this->fread(1));
-// $RasterData['block_byte_count'] = getid3_lib::LittleEndian2Int($this->fread(1));
-// $info['gif']['raster_data'][count($info['gif']['image_descriptor']) - 1] = $RasterData;
-//
-// $CurrentCodeSize = $RasterData['code_size'] + 1;
-// for ($i = 0; $i < pow(2, $RasterData['code_size']); $i++) {
-// $DefaultDataLookupTable[$i] = chr($i);
-// }
-// $DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 0] = ''; // Clear Code
-// $DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 1] = ''; // End Of Image Code
-//
-//
-// $NextValue = $this->GetLSBits($CurrentCodeSize);
-// echo 'Clear Code: '.$NextValue.'<BR>';
-//
-// $NextValue = $this->GetLSBits($CurrentCodeSize);
-// echo 'First Color: '.$NextValue.'<BR>';
-//
-// $Prefix = $NextValue;
-//$i = 0;
-// while ($i++ < 20) {
-// $NextValue = $this->GetLSBits($CurrentCodeSize);
-// echo $NextValue.'<BR>';
-// }
-//return true;
-// break;
-//
-// case '!':
-// // GIF Extension Block
-// $ExtensionBlockData = $NextBlockTest.$this->fread(2);
-// $ExtensionBlock = array();
-// $ExtensionBlock['function_code'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 1, 1));
-// $ExtensionBlock['byte_length'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 2, 1));
-// $ExtensionBlock['data'] = $this->fread($ExtensionBlock['byte_length']);
-// $info['gif']['extension_blocks'][] = $ExtensionBlock;
-// break;
-//
-// case ';':
-// $info['gif']['terminator_offset'] = $this->ftell() - 1;
-// // GIF Terminator
-// break;
-//
-// default:
-// break;
-//
-//
-// }
-// }
+ if ($info['gif']['header']['flags']['global_color_table']) {
+ $GIFcolorTable = $this->fread(3 * $info['gif']['header']['global_color_size']);
+ $offset = 0;
+ for ($i = 0; $i < $info['gif']['header']['global_color_size']; $i++) {
+ $red = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
+ $green = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
+ $blue = getid3_lib::LittleEndian2Int(substr($GIFcolorTable, $offset++, 1));
+ $info['gif']['global_color_table'][$i] = (($red << 16) | ($green << 8) | ($blue));
+ }
+ }
+
+ // Image Descriptor
+ $info['gif']['animation']['animated'] = false;
+ while (!feof($this->getid3->fp)) {
+ $NextBlockTest = $this->fread(1);
+ switch ($NextBlockTest) {
+
+/*
+ case ',': // ',' - Image separator character
+ $ImageDescriptorData = $NextBlockTest.$this->fread(9);
+ $ImageDescriptor = array();
+ $ImageDescriptor['image_left'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 1, 2));
+ $ImageDescriptor['image_top'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 3, 2));
+ $ImageDescriptor['image_width'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 5, 2));
+ $ImageDescriptor['image_height'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 7, 2));
+ $ImageDescriptor['flags_raw'] = getid3_lib::LittleEndian2Int(substr($ImageDescriptorData, 9, 1));
+ $ImageDescriptor['flags']['use_local_color_map'] = (bool) ($ImageDescriptor['flags_raw'] & 0x80);
+ $ImageDescriptor['flags']['image_interlaced'] = (bool) ($ImageDescriptor['flags_raw'] & 0x40);
+ $info['gif']['image_descriptor'][] = $ImageDescriptor;
+
+ if ($ImageDescriptor['flags']['use_local_color_map']) {
+
+ $this->warning('This version of getID3() cannot parse local color maps for GIFs');
+ return true;
+
+ }
+ $RasterData = array();
+ $RasterData['code_size'] = getid3_lib::LittleEndian2Int($this->fread(1));
+ $RasterData['block_byte_count'] = getid3_lib::LittleEndian2Int($this->fread(1));
+ $info['gif']['raster_data'][count($info['gif']['image_descriptor']) - 1] = $RasterData;
+
+ $CurrentCodeSize = $RasterData['code_size'] + 1;
+ for ($i = 0; $i < pow(2, $RasterData['code_size']); $i++) {
+ $DefaultDataLookupTable[$i] = chr($i);
+ }
+ $DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 0] = ''; // Clear Code
+ $DefaultDataLookupTable[pow(2, $RasterData['code_size']) + 1] = ''; // End Of Image Code
+
+ $NextValue = $this->GetLSBits($CurrentCodeSize);
+ echo 'Clear Code: '.$NextValue.'<BR>';
+
+ $NextValue = $this->GetLSBits($CurrentCodeSize);
+ echo 'First Color: '.$NextValue.'<BR>';
+
+ $Prefix = $NextValue;
+ $i = 0;
+ while ($i++ < 20) {
+ $NextValue = $this->GetLSBits($CurrentCodeSize);
+ echo $NextValue.'<br>';
+ }
+ echo 'escaping<br>';
+ return true;
+ break;
+*/
+
+ case '!':
+ // GIF Extension Block
+ $ExtensionBlockData = $NextBlockTest.$this->fread(2);
+ $ExtensionBlock = array();
+ $ExtensionBlock['function_code'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 1, 1));
+ $ExtensionBlock['byte_length'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlockData, 2, 1));
+ $ExtensionBlock['data'] = (($ExtensionBlock['byte_length'] > 0) ? $this->fread($ExtensionBlock['byte_length']) : null);
+
+ if (substr($ExtensionBlock['data'], 0, 11) == 'NETSCAPE2.0') { // Netscape Application Block (NAB)
+ $ExtensionBlock['data'] .= $this->fread(4);
+ if (substr($ExtensionBlock['data'], 11, 2) == "\x03\x01") {
+ $info['gif']['animation']['animated'] = true;
+ $info['gif']['animation']['loop_count'] = getid3_lib::LittleEndian2Int(substr($ExtensionBlock['data'], 13, 2));
+ } else {
+ $this->warning('Expecting 03 01 at offset '.($this->ftell() - 4).', found "'.getid3_lib::PrintHexBytes(substr($ExtensionBlock['data'], 11, 2)).'"');
+ }
+ }
+
+ $info['gif']['extension_blocks'][] = $ExtensionBlock;
+ break;
+
+ case ';':
+ $info['gif']['terminator_offset'] = $this->ftell() - 1;
+ // GIF Terminator
+ break;
+
+ default:
+ break;
+
+
+ }
+ }
return true;
}
-
+ /**
+ * @param int $bits
+ *
+ * @return float|int
+ */
public function GetLSBits($bits) {
static $bitbuffer = '';
while (strlen($bitbuffer) < $bits) {
dépôts / lhc / web / www.git / blobdiff
