timecode: add avpriv_check_timecode_rate().

libavcodec/timecode.c

@@ -55,7 +55,7 @@ uint32_t avpriv_framenum_to_smpte_timecode(unsigned frame, int fps, int drop)
            (  (frame / (fps * 3600) % 24)) % 10;          // units of hours
 }
 
-static int check_timecode_rate(void *avcl, AVRational rate, int drop)
+int avpriv_check_timecode_rate(void *avcl, AVRational rate, int drop)
 {
     int fps;
 
@@ -109,7 +109,7 @@ int avpriv_init_smpte_timecode(void *avcl, struct ff_timecode *tc)
 
     tc->drop  = c != ':'; // drop if ';', '.', ...
 
-    ret = check_timecode_rate(avcl, tc->rate, tc->drop);
+    ret = avpriv_check_timecode_rate(avcl, tc->rate, tc->drop);
     if (ret < 0)
         return ret;
 

libavcodec/timecode.h

@@ -72,6 +72,13 @@ uint32_t avpriv_framenum_to_smpte_timecode(unsigned frame, int fps, int drop);
  */
 char *avpriv_timecode_to_string(char *buf, const struct ff_timecode *tc, unsigned frame);
 
+/**
+ * Check if timecode rate is valid and consistent with the drop flag.
+ *
+ * @return 0 on success, negative value on failure
+ */
+int avpriv_check_timecode_rate(void *avcl, AVRational rate, int drop);
+
 /**
  * Parse SMTPE 12M time representation (hh:mm:ss[:;.]ff). str and rate fields
  * from tc struct must be set.

libavcodec/version.h

@@ -21,7 +21,7 @@
 #define AVCODEC_VERSION_H
 
 #define LIBAVCODEC_VERSION_MAJOR 53
-#define LIBAVCODEC_VERSION_MINOR 53
+#define LIBAVCODEC_VERSION_MINOR 54
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \