GME Plugin: try loading m3u sidecar files

src/decoder/plugins/GmeDecoderPlugin.cxx

@@ -105,16 +105,39 @@ ParseContainerPath(Path path_fs)
 	return { path_fs.GetDirectoryName(), track - 1 };
 }
 
-static void
-gme_file_decode(DecoderClient &client, Path path_fs)
-{
-	const auto container = ParseContainerPath(path_fs);
+static Music_Emu*
+LoadGmeAndM3u(GmeContainerPath container) {
+
+	const char *path = container.path.c_str();
+	const char *suffix = uri_get_suffix(path);
 
 	Music_Emu *emu;
 	const char *gme_err =
-		gme_open_file(container.path.c_str(), &emu, GME_SAMPLE_RATE);
+		gme_open_file(path, &emu, GME_SAMPLE_RATE);
 	if (gme_err != nullptr) {
 		LogWarning(gme_domain, gme_err);
+		return nullptr;
+	}
+
+	if(suffix == nullptr) {
+		return emu;
+	}
+
+	std::string m3u_path(path,suffix);
+	m3u_path += "m3u";
+
+	gme_load_m3u(emu,m3u_path.c_str());
+	return emu;
+}
+
+
+static void
+gme_file_decode(DecoderClient &client, Path path_fs)
+{
+	const auto container = ParseContainerPath(path_fs);
+
+	Music_Emu *emu = LoadGmeAndM3u(container);
+	if(emu == nullptr) {
 		return;
 	}
 
@@ -129,7 +152,7 @@ gme_file_decode(DecoderClient &client, Path path_fs)
 #endif
 
 	gme_info_t *ti;
-	gme_err = gme_track_info(emu, &ti, container.track);
+	const char *gme_err = gme_track_info(emu, &ti, container.track);
 	if (gme_err != nullptr) {
 		LogWarning(gme_domain, gme_err);
 		return;
@@ -255,11 +278,8 @@ gme_scan_file(Path path_fs,
 {
 	const auto container = ParseContainerPath(path_fs);
 
-	Music_Emu *emu;
-	const char *gme_err =
-		gme_open_file(container.path.c_str(), &emu, GME_SAMPLE_RATE);
-	if (gme_err != nullptr) {
-		LogWarning(gme_domain, gme_err);
+	Music_Emu *emu = LoadGmeAndM3u(container);
+	if(emu == nullptr) {
 		return false;
 	}
 
@@ -272,12 +292,10 @@ static std::forward_list<DetachedSong>
 gme_container_scan(Path path_fs)
 {
 	std::forward_list<DetachedSong> list;
+	const auto container = ParseContainerPath(path_fs);
 
-	Music_Emu *emu;
-	const char *gme_err = gme_open_file(path_fs.c_str(), &emu,
-					    GME_SAMPLE_RATE);
-	if (gme_err != nullptr) {
-		LogWarning(gme_domain, gme_err);
+	Music_Emu *emu = LoadGmeAndM3u(container);
+	if(emu == nullptr) {
 		return list;
 	}