requesthandler: Add CreateRecordChapter

The new `Hybrid MP4 [BETA]` output added in OBS adds support for
writing chapter markers to the file.

src/requesthandler/RequestHandler.cpp

@@ -178,6 +178,7 @@ const std::unordered_map<std::string, RequestMethodHandler> RequestHandler::_han
 	{"PauseRecord", &RequestHandler::PauseRecord},
 	{"ResumeRecord", &RequestHandler::ResumeRecord},
 	{"SplitRecordFile", &RequestHandler::SplitRecordFile},
+	{"CreateRecordChapter", &RequestHandler::CreateRecordChapter},
 
 	// Media Inputs
 	{"GetMediaInputStatus", &RequestHandler::GetMediaInputStatus},

src/requesthandler/RequestHandler.h

@@ -197,6 +197,7 @@ class RequestHandler {
 	RequestResult PauseRecord(const Request &);
 	RequestResult ResumeRecord(const Request &);
 	RequestResult SplitRecordFile(const Request &);
+	RequestResult CreateRecordChapter(const Request &);
 
 	// Media Inputs
 	RequestResult GetMediaInputStatus(const Request &);

src/requesthandler/RequestHandler_Record.cpp

@@ -211,3 +211,38 @@ RequestResult RequestHandler::SplitRecordFile(const Request &)
 
 	return RequestResult::Success();
 }
+
+/**
+ * Adds a new chapter marker to the file currently being recorded.
+ *
+ * Note: As of OBS 30.2.0, the only file format supporting this feature is Hybrid MP4.
+ *
+ * @requestField ?chapterName | String | Name of the new chapter
+ *
+ * @requestType CreateRecordChapter
+ * @complexity 2
+ * @rpcVersion -1
+ * @initialVersion 5.5.0
+ * @api requests
+ * @category record
+ */
+RequestResult RequestHandler::CreateRecordChapter(const Request &request)
+{
+	std::string chapterName;
+	if (request.Contains("chapterName")) {
+		RequestStatus::RequestStatus statusCode;
+		std::string comment;
+		if (!request.ValidateOptionalString("chapterName", statusCode, comment))
+			return RequestResult::Error(statusCode, comment);
+		chapterName = request.RequestData["chapterName"];
+	}
+
+	if (!obs_frontend_recording_active())
+		return RequestResult::Error(RequestStatus::OutputNotRunning);
+
+	if (!obs_frontend_recording_add_chapter(chapterName.empty() ? nullptr : chapterName.c_str()))
+		return RequestResult::Error(RequestStatus::RequestProcessingFailed,
+					    "Verify that the output being used supports chapter markers.");
+
+	return RequestResult::Success();
+}