dvbinfo: implement monitor mode

In monitor mode dvbinfo runs as Unix daemon and the logging goes to syslog instead of stderr.
- added -m (--monitor) commandline switch to run in the background
- added -s (--summary) commandline switch to produce bitrate summary files
- added --summary-file commandline switch to give a summary-file name (default: stdout)
- added --summary-period commandline switch to write every <n> ms a new summary file
- implemented a logging callback function for routing the dvbpsi log messages to dvbinfo application

examples/dvbinfo/dvbinfo.h

@@ -23,6 +23,15 @@
 #ifndef DVBINFO_H_
 #define DVBINFO_H_
 
+/* defined loglevels for use within dvbinfo are as follows,
+ * they match to this order of syslog priority levels.
+ * { LOG_ERR, LOG_WARNING, LOG_INFO, LOG_DEBUG };
+ */
+#define DVBINFO_LOG_ERROR 0
+#define DVBINFO_LOG_WARN  1
+#define DVBINFO_LOG_INFO  2
+#define DVBINFO_LOG_DEBUG 3
+
 typedef struct params_s
 {
     /* parameters */
@@ -39,10 +48,21 @@ typedef struct params_s
     int  debug;
     bool b_verbose;
 
+    /* statistics */
+    bool b_summary; /* write summary */
+    struct summary_s {
+        int mode;       /* one of: i_summary_mode */
+        int64_t period; /* summary period in ms */
+        char *file;     /* summary file name    */
+        FILE *fd;       /* summary file descriptor */
+    } summary;
+
     /* read data from file of socket */
     ssize_t (*pf_read)(int fd, void *buf, size_t count);
     ssize_t (*pf_write)(int fd, const void *buf, size_t count);
+
+    /* logging function */
+    void (*pf_log)(const int level, const char *format, ...);
 } params_t;
 
 #endif
-

examples/dvbinfo/libdvbpsi.h

@@ -23,16 +23,24 @@
 #ifndef DVBINFO_DVBPSI_H_
 #define DVBINFO_DVBPSI_H_
 
+/* Date and time */
 typedef int64_t mtime_t;
 mtime_t mdate(void);
 
+/* Summary */
+#define SUM_BANDWIDTH 0
+#define SUM_TABLE     1
+#define SUM_PACKET    2
+#define SUM_WIRE      3
+
 /* MPEG-TS PSI decoders */
 typedef struct ts_stream_t ts_stream_t;
+typedef void (* ts_stream_log_cb)(void *data, const int level, const char *msg, ...);
 
 /* */
-ts_stream_t *libdvbpsi_init(int debug);
+ts_stream_t *libdvbpsi_init(int debug, ts_stream_log_cb pf_log, void *cb_data);
 bool libdvbpsi_process(ts_stream_t *stream, uint8_t *buf, ssize_t length, mtime_t date);
-void libdvbpsi_summary(ts_stream_t *stream);
+void libdvbpsi_summary(FILE *fd, ts_stream_t *stream, const int summary_mode);
 void libdvbpsi_exit(ts_stream_t *stream);
 
 #endif

src/dvbpsi.h

@@ -97,6 +97,12 @@ struct dvbpsi_s
     /* Messages callback */
     dvbpsi_message_cb             pf_message;           /*!< Log message callback */
     enum dvbpsi_msg_level         i_msg_level;          /*!< Log level */
+
+    /* private data pointer for use by caller, not by libdvbpsi itself ! */
+    void                         *p_sys;                /*!< pointer to private data
+                                                          from caller. Do not use
+                                                          from inside libdvbpsi. It
+                                                          will crash any application. */
 };
 
 /*****************************************************************************