Merge pull request #119 from AcademySoftwareFoundation/improve_imhex_pattern

Improve ImHex Pattern file to detect file type automatically

Author: tuzm24

README.md

@@ -103,9 +103,9 @@ Decoding:
 
 Pattern file of APV bitstream for [ImHex](https://github.com/WerWolv/ImHex) is provided [here](/util/apv.hexpat).
 1. Install [ImHex](https://github.com/WerWolv/ImHex) application
-2. Download [APV pattern file](/util/apv.hexpat)
-2. Open APV bitstream (\*.apv file) with ImHex
-3. Import the APV pattern file on Pattern editor view of ImHex and apply
+2. Download [APV pattern file](/util/apv.hexpat) and copy it to 'patterns' directory of the ImHex application
+3. Open an APV bitstream (*.apv file) file with the ImHex application
+4. The APV pattern file will be selected automatically and press 'yes' to apply it
 
 ![APV_on_ImHex](/readme/img/apv_parser_on_imhex.png)
 

util/apv.hexpat

@@ -1,8 +1,10 @@
 #pragma pattern for Advanced Professional Video (*.apv)
 
+#pragma magic [ 61 50 76 31 ] @ 0x04
+#pragma endian big
+
 import std.io;
 import std.mem;
-#pragma endian big
 
 /* PBU types */
 enum PbuType : u8 {