LibMedia: Set Matroska "complex" tracks' types based on the codec

The spec indicates that the codec defines how to interpret the data,
so use our CodecIDs to determine the track type.

Libraries/LibMedia/CodecID.h

@@ -7,6 +7,7 @@
 #pragma once
 
 #include <AK/Format.h>
+#include <LibMedia/TrackType.h>
 
 namespace Media {
 
@@ -33,6 +34,32 @@ enum class CodecID : u32 {
     FLAC,
 };
 
+inline TrackType track_type_from_codec_id(CodecID codec)
+{
+    switch (codec) {
+    case CodecID::VP8:
+    case CodecID::VP9:
+    case CodecID::H261:
+    case CodecID::MPEG1:
+    case CodecID::H262:
+    case CodecID::H263:
+    case CodecID::H264:
+    case CodecID::H265:
+    case CodecID::AV1:
+        return TrackType::Video;
+    case CodecID::MP3:
+    case CodecID::AAC:
+    case CodecID::Theora:
+    case CodecID::Vorbis:
+    case CodecID::Opus:
+    case CodecID::FLAC:
+        return TrackType::Audio;
+    case CodecID::Unknown:
+        break;
+    }
+    return TrackType::Unknown;
+}
+
 }
 
 namespace AK {

Libraries/LibMedia/Containers/Matroska/Reader.cpp

@@ -13,6 +13,7 @@
 #include <AK/Time.h>
 #include <AK/Utf8View.h>
 #include <LibCore/MappedFile.h>
+#include <LibMedia/CodecID.h>
 #include <LibMedia/Containers/Matroska/Utilities.h>
 
 #include "Reader.h"
@@ -538,6 +539,24 @@ static DecoderErrorOr<NonnullRefPtr<TrackEntry>> parse_track_entry(Streamer& str
         return IterationDecision::Continue;
     }));
 
+    if (track_entry->track_type() == TrackEntry::TrackType::Complex) {
+        // A mix of different other TrackType. The codec needs to define how the Matroska Player
+        // should interpret such data.
+        auto codec_track_type = track_type_from_codec_id(codec_id_from_matroska_id_string(track_entry->codec_id()));
+        switch (codec_track_type) {
+        case TrackType::Video:
+            track_entry->set_track_type(TrackEntry::TrackType::Video);
+            break;
+        case TrackType::Audio:
+            track_entry->set_track_type(TrackEntry::TrackType::Audio);
+            break;
+        case TrackType::Subtitles:
+            track_entry->set_track_type(TrackEntry::TrackType::Subtitle);
+            break;
+        case TrackType::Unknown:
+            break;
+        }
+    }
     return track_entry;
 }
 

Libraries/LibMedia/Track.h

@@ -13,16 +13,10 @@
 #include <AK/Utf16String.h>
 #include <AK/Variant.h>
 #include <LibMedia/Color/CodingIndependentCodePoints.h>
+#include <LibMedia/TrackType.h>
 
 namespace Media {
 
-enum class TrackType : u32 {
-    Video,
-    Audio,
-    Subtitles,
-    Unknown,
-};
-
 class Track {
     struct VideoData {
         u64 pixel_width { 0 };

Libraries/LibMedia/TrackType.h

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2025, Gregory Bertilson <gregory@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Types.h>
+
+namespace Media {
+
+enum class TrackType : u8 {
+    Video,
+    Audio,
+    Subtitles,
+    Unknown,
+};
+
+}