LibMedia: Move conversion of Matroska codecs to CodecID to a new file

This function is needed in Matroska::Reader to check for Opus in the
next commit.

Author: Zaggy1024

Libraries/LibMedia/Containers/Matroska/MatroskaDemuxer.cpp

@@ -8,6 +8,7 @@
 #include <AK/Debug.h>
 #include <AK/Utf16String.h>
 #include <LibMedia/CodedFrame.h>
+#include <LibMedia/Containers/Matroska/Utilities.h>
 #include <LibMedia/DecoderError.h>
 
 #include "MatroskaDemuxer.h"
@@ -125,44 +126,10 @@ DecoderErrorOr<MatroskaDemuxer::TrackStatus*> MatroskaDemuxer::get_track_status(
     return &m_track_statuses.get(track).release_value();
 }
 
-static CodecID get_codec_id_for_string(String const& codec_id)
-{
-    dbgln_if(MATROSKA_DEBUG, "Codec ID: {}", codec_id);
-    if (codec_id == "V_VP8")
-        return CodecID::VP8;
-    if (codec_id == "V_VP9")
-        return CodecID::VP9;
-    if (codec_id == "V_MPEG1")
-        return CodecID::MPEG1;
-    if (codec_id == "V_MPEG2")
-        return CodecID::H262;
-    if (codec_id == "V_MPEG4/ISO/AVC")
-        return CodecID::H264;
-    if (codec_id == "V_MPEGH/ISO/HEVC")
-        return CodecID::H265;
-    if (codec_id == "A_MPEG/L3")
-        return CodecID::MP3;
-    if (codec_id == "A_AAC" || codec_id == "A_AAC/MPEG4/LC"
-        || codec_id == "A_AAC/MPEG4/LC/SBR" || codec_id == "A_AAC/MPEG4/LTP"
-        || codec_id == "A_AAC/MPEG4/MAIN" || codec_id == "A_AAC/MPEG4/SSR")
-        return CodecID::AAC;
-    if (codec_id == "V_AV1")
-        return CodecID::AV1;
-    if (codec_id == "V_THEORA")
-        return CodecID::Theora;
-    if (codec_id == "A_VORBIS")
-        return CodecID::Vorbis;
-    if (codec_id == "A_OPUS")
-        return CodecID::Opus;
-    if (codec_id == "A_FLAC")
-        return CodecID::FLAC;
-    return CodecID::Unknown;
-}
-
 DecoderErrorOr<CodecID> MatroskaDemuxer::get_codec_id_for_track(Track const& track)
 {
     auto codec_id = TRY(m_reader.track_for_track_number(track.identifier()))->codec_id();
-    return get_codec_id_for_string(codec_id);
+    return codec_id_from_matroska_id_string(codec_id);
 }
 
 DecoderErrorOr<ReadonlyBytes> MatroskaDemuxer::get_codec_initialization_data_for_track(Track const& track)

Libraries/LibMedia/Containers/Matroska/Utilities.h

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2025, Gregory Bertilson <gregory@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/String.h>
+#include <LibMedia/CodecID.h>
+
+namespace Media::Matroska {
+
+static constexpr CodecID codec_id_from_matroska_id_string(String const& codec_id)
+{
+    if (codec_id == "V_VP8")
+        return CodecID::VP8;
+    if (codec_id == "V_VP9")
+        return CodecID::VP9;
+    if (codec_id == "V_MPEG1")
+        return CodecID::MPEG1;
+    if (codec_id == "V_MPEG2")
+        return CodecID::H262;
+    if (codec_id == "V_MPEG4/ISO/AVC")
+        return CodecID::H264;
+    if (codec_id == "V_MPEGH/ISO/HEVC")
+        return CodecID::H265;
+    if (codec_id == "A_MPEG/L3")
+        return CodecID::MP3;
+    if (codec_id == "A_AAC" || codec_id == "A_AAC/MPEG4/LC"
+        || codec_id == "A_AAC/MPEG4/LC/SBR" || codec_id == "A_AAC/MPEG4/LTP"
+        || codec_id == "A_AAC/MPEG4/MAIN" || codec_id == "A_AAC/MPEG4/SSR")
+        return CodecID::AAC;
+    if (codec_id == "V_AV1")
+        return CodecID::AV1;
+    if (codec_id == "V_THEORA")
+        return CodecID::Theora;
+    if (codec_id == "A_VORBIS")
+        return CodecID::Vorbis;
+    if (codec_id == "A_OPUS")
+        return CodecID::Opus;
+    if (codec_id == "A_FLAC")
+        return CodecID::FLAC;
+    return CodecID::Unknown;
+}
+
+}