Start/restart behavior, more of relevant status output

src/camogm.h

@@ -35,6 +35,7 @@
 #define NUM_NEED_NEMPTY           (NUM_WRITER_THREADS + 0) // wake up main thread if there are at least this number of empty pages
 #define NUM_FREE_MANY             (NUM_WRITER_THREADS + 1) // Set many if get_num_empty() < NUM_FREE_MANY
 
+#define ERRORS_FROM_START         1        ///< Reset errors only when starting recording, not after reading status
 //#define NODEBUG
 #define CAMOGM_FRAME_NOT_READY    1        ///< frame pointer valid, but not yet acquired
 #define CAMOGM_FRAME_INVALID      2        ///< invalid frame pointer
@@ -172,7 +173,7 @@ enum state_flags {
 	STATE_STARTING,
 	STATE_RUNNING,
 	STATE_READING,
-	STATE_RESTARTING,
+	STATE_RESTARTING, // after errors, until started
 	STATE_CANCEL
 };
 
@@ -337,6 +338,10 @@ typedef struct {
 	int data_segments;                                      ///< the number of segments in frame
 	int buf_overruns[SENSOR_PORTS];
 	int buf_min[SENSOR_PORTS];
+	int buf_free[SENSOR_PORTS];                             ///< free buffer size last measured, per port
+	int buf_mfree;                                          ///< free buffer size - minimal for all ports
+	int buf_mmin;                                           ///< minimum of buf_min[port]
+	int error_restarts;                                     ///< number of restarts due to errors;
 	int set_frames_skip;                                    ///< will be copied to frames_skip if stopped or at start
 	int frames_skip;                                        ///< number of frames to skip after the one recorded (for time lapse)
 	                                                        ///< if negative - -(interval between frames in seconds)