Add basic Kaitai definition for WEM files

Author: abheekda1

ksy/wem.ksy

@@ -0,0 +1,93 @@
+meta:
+  id: wem
+  file-extension: wem
+  endian: le
+
+seq:
+  - id: riff_header
+    type: riff_header
+  - id: chunks
+    type: chunk
+    repeat: eos
+
+types:
+  riff_header:
+    seq:
+      - id: magic
+        contents: 'RIFF'
+      - id: chunk_size
+        type: u4
+      - id: wav_id
+        type: u4
+  riff_chunk:
+    seq:
+      - id: type
+        # No longer using a string because the type can have some non-standard chars
+        #type: str
+        size: 4
+        #encoding: UTF-8
+      - id: size
+        type: u4
+  fmt_chunk:
+    seq:
+      - id: format_tag
+        type: u2
+      - id: channels
+        type: u2
+      - id: samples_per_sec
+        type: u4
+      - id: avg_bytes_per_sec
+        type: u4
+      - id: blockalign
+        type: u2
+      - id: bits_per_sample
+        type: u2
+      - id: size
+        type: u2
+      - id: valid_bits_per_sample
+        type: u2
+      - id: channel_mask
+        type: u4
+      - id: guid
+        type: str
+        size: 42
+        encoding: utf-8
+  cue_chunk:
+    seq:
+      - id: cue_count
+        type: u4
+  list_chunk:
+    params:
+      - id: size
+        type: u4
+    seq:
+      - id: list
+        size: size
+  junk_chunk:
+    seq:
+      - id: junk
+        type: str
+        size: 26
+        encoding: utf-8
+  data_chunk:
+    params:
+      - id: size
+        type: u4
+    seq:
+      - id: data
+        type: str
+        size: size
+        encoding: utf-8
+  chunk:
+    seq:
+      - id: riff_chunk
+        type: riff_chunk
+      - id: data
+        type:
+          switch-on: riff_chunk.type
+          cases:
+            '[0x66, 0x6d, 0x74, 0x20]': fmt_chunk
+            '[0x4a, 0x55, 0x4e, 0x4b]': junk_chunk
+            '[0x63, 0x75, 0x65, 0x20]': cue_chunk
+            '[0x4c, 0x49, 0x53, 0x54]': list_chunk(riff_chunk.size)
+            '[0x64, 0x61, 0x74, 0x61]': data_chunk(riff_chunk.size)