Refactor video encoding packet receiving, replay buffer and finish SIGRTMIN for recording while replay/replaying. Add -ro option to specify the directory

include/replay_buffer.h

@@ -0,0 +1,41 @@
+#ifndef GSR_REPLAY_BUFFER_H
+#define GSR_REPLAY_BUFFER_H
+
+#include <pthread.h>
+#include <stdbool.h>
+#include <libavcodec/packet.h>
+
+typedef struct {
+    AVPacket packet;
+    int ref_counter;
+    double timestamp;
+} gsr_av_packet;
+
+gsr_av_packet* gsr_av_packet_create(const AVPacket *av_packet, double timestamp);
+gsr_av_packet* gsr_av_packet_ref(gsr_av_packet *self);
+void gsr_av_packet_unref(gsr_av_packet *self);
+
+typedef struct {
+    gsr_av_packet **packets;
+    size_t capacity_num_packets;
+    size_t num_packets;
+    size_t index;
+    pthread_mutex_t mutex;
+    bool mutex_initialized;
+    bool owns_mutex;
+} gsr_replay_buffer;
+
+bool gsr_replay_buffer_init(gsr_replay_buffer *self, size_t replay_buffer_num_packets);
+void gsr_replay_buffer_deinit(gsr_replay_buffer *self);
+
+bool gsr_replay_buffer_append(gsr_replay_buffer *self, const AVPacket *av_packet, double timestamp);
+void gsr_replay_buffer_clear(gsr_replay_buffer *self);
+gsr_av_packet* gsr_replay_buffer_get_packet_at_index(gsr_replay_buffer *self, size_t index);
+/* The clone has to be deinitialized before the replay buffer it clones */
+bool gsr_replay_buffer_clone(const gsr_replay_buffer *self, gsr_replay_buffer *destination);
+/* Returns 0 if replay buffer is empty */
+size_t gsr_replay_buffer_find_packet_index_by_time_passed(gsr_replay_buffer *self, int seconds);
+/* Returns -1 if not found */
+size_t gsr_replay_buffer_find_keyframe(gsr_replay_buffer *self, size_t start_index, int stream_index, bool invert_stream_index);
+
+#endif /* GSR_REPLAY_BUFFER_H */