Add a logger callback for FFmpeg log messages

src/logger.c

@@ -29,6 +29,8 @@
 
 #include <event.h>
 
+#include <libavutil/log.h>
+
 #include "logger.h"
 
 
@@ -130,6 +132,26 @@ DPRINTF(int severity, int domain, const char *fmt, ...)
   va_end(ap);
 }
 
+void
+logger_ffmpeg(void *ptr, int level, const char *fmt, va_list ap)
+{
+  int severity;
+
+  /* Can't use a switch() because some definitions have the same value */
+  if ((level == AV_LOG_FATAL) || (level == AV_LOG_ERROR))
+    severity = E_LOG;
+  else if ((level == AV_LOG_WARNING) || (level == AV_LOG_INFO) || (level == AV_LOG_VERBOSE))
+    severity = E_WARN;
+  else if (level == AV_LOG_DEBUG)
+    severity = E_DBG;
+  else if (level == AV_LOG_QUIET)
+    severity = E_SPAM;
+  else
+    severity = E_LOG;
+
+  vlogger(severity, L_FFMPEG, fmt, ap);
+}
+
 void
 logger_libevent(int severity, const char *msg)
 {

src/logger.h

@@ -38,6 +38,9 @@ vlogger(int severity, int domain, const char *fmt, va_list args);
 void
 DPRINTF(int severity, int domain, const char *fmt, ...) __attribute__((format(printf, 3, 4)));
 
+void
+logger_ffmpeg(void *ptr, int level, const char *fmt, va_list ap);
+
 void
 logger_libevent(int severity, const char *msg);
 

src/main.c

@@ -49,6 +49,7 @@
 
 #include <getopt.h>
 #include <event.h>
+#include <libavutil/log.h>
 #include <libavformat/avformat.h>
 
 #include <gcrypt.h>
@@ -555,6 +556,7 @@ main(int argc, char **argv)
 
   /* Initialize ffmpeg */
   av_register_all();
+  av_log_set_callback(logger_ffmpeg);
 
   /* Initialize libgcrypt */
   gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);