encoders/generic: Implement video encoding and always use frame queue

This implements video encoding for the generic encoder by using frame queue and a set lag amount (in frames). The lag amount determines for how many frames no repeated attempts at submitting or retrieving a frame should be made, and after that many frames have been submitted the generic encoder will try to retrieve packets if at all possible. If not possible, it will delay for as long as possible to show an Encoder overloaded message.

source/encoders/generic.hpp

@@ -64,6 +64,9 @@ namespace encoder {
 		ffmpeg::swscale       swscale;
 		AVPacket*             current_packet = nullptr;
 
+		int64_t lag_in_frames;
+		int64_t frame_count;
+
 		public:
 		generic(obs_data_t* settings, obs_encoder_t* encoder);
 		virtual ~generic();
@@ -74,13 +77,13 @@ namespace encoder {
 
 		bool update(obs_data_t* settings);
 
-		bool encode(struct encoder_frame* frame, struct encoder_packet* packet, bool* received_packet);
-
 		// Audio only
 		void get_audio_info(struct audio_convert_info* info);
 
 		size_t get_frame_size();
 
+		bool audio_encode(struct encoder_frame* frame, struct encoder_packet* packet, bool* received_packet);
+
 		// Video only
 		void get_video_info(struct video_scale_info* info);
 
@@ -88,8 +91,9 @@ namespace encoder {
 
 		bool get_extra_data(uint8_t** extra_data, size_t* size);
 
-		// GPU Video only
-		bool encode_texture(uint32_t handle, int64_t pts, uint64_t lock_key, uint64_t* next_key,
-		                    struct encoder_packet* packet, bool* received_packet);
+		bool video_encode(struct encoder_frame* frame, struct encoder_packet* packet, bool* received_packet);
+
+		bool video_encode_texture(uint32_t handle, int64_t pts, uint64_t lock_key, uint64_t* next_key,
+		                          struct encoder_packet* packet, bool* received_packet);
 	};
 } // namespace encoder