Detect both raw and BDAV versions of MPEG-2 Transport Streams (#497)

core.js

@@ -1281,7 +1281,16 @@ class FileTypeParser {
 			};
 		}
 
-		if (this.check([0x47], {offset: 4}) && (this.check([0x47], {offset: 192}) || this.check([0x47], {offset: 196}))) {
+		// Raw MPEG-2 transport stream (188-byte packets)
+		if (this.check([0x47]) && this.check([0x47], {offset: 188})) {
+			return {
+				ext: 'mts',
+				mime: 'video/mp2t',
+			};
+		}
+
+		// Blu-ray Disc Audio-Video (BDAV) MPEG-2 transport stream has 4-byte TP_extra_header before each 188-byte packet
+		if (this.check([0x47], {offset: 4}) && this.check([0x47], {offset: 196})) {
 			return {
 				ext: 'mts',
 				mime: 'video/mp2t',

readme.md

@@ -395,7 +395,7 @@ Returns a `Set<string>` of supported MIME types.
 - [`lz`](https://en.wikipedia.org/wiki/Lzip) - Arhive file
 - [`cfb`](https://en.wikipedia.org/wiki/Compound_File_Binary_Format) - Compount File Binary Format
 - [`mxf`](https://en.wikipedia.org/wiki/Material_Exchange_Format) - Material Exchange Format
-- [`mts`](https://en.wikipedia.org/wiki/.m2ts) - Blu-ray Disc Audio-Video MPEG-2 Transport Stream
+- [`mts`](https://en.wikipedia.org/wiki/.m2ts) - MPEG-2 Transport Stream, both raw and Blu-ray Disc Audio-Video (BDAV) versions
 - [`wasm`](https://en.wikipedia.org/wiki/WebAssembly) - WebAssembly intermediate compiled format
 - [`blend`](https://wiki.blender.org/index.php/Dev:Source/Architecture/File_Format) - Blender project
 - [`bpg`](https://bellard.org/bpg/) - Better Portable Graphics file

test.js

@@ -86,6 +86,10 @@ const names = {
 		'fixture-mp4v2',
 		'fixture-dash',
 	],
+	mts: [
+		'fixture-raw',
+		'fixture-bdav',
+	],
 	tif: [
 		'fixture-big-endian',
 		'fixture-little-endian',