X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavutil%2Flog.h;h=c2f1232a1675315f6ce0b0f18711d0a6ec8759c9;hb=0bf3a7361d17d596a5044882098f56817db0e103;hp=d9554e609d40027760b744e666db44984103072d;hpb=ee96ab2db507b95a694f10b152481cf71842de28;p=ffmpeg

diff --git a/libavutil/log.h b/libavutil/log.h
index d9554e609d4..c2f1232a167 100644
--- a/libavutil/log.h
+++ b/libavutil/log.h
@@ -112,16 +112,6 @@ typedef struct AVClass {
      */
     void* (*child_next)(void *obj, void *prev);
 
-    /**
-     * Return an AVClass corresponding to the next potential
-     * AVOptions-enabled child.
-     *
-     * The difference between child_next and this is that
-     * child_next iterates over _already existing_ objects, while
-     * child_class_next iterates over _all possible_ children.
-     */
-    const struct AVClass* (*child_class_next)(const struct AVClass *prev);
-
     /**
      * Category used for visualization (like color)
      * This is only set if the category is equal for all objects using this class.
@@ -140,6 +130,21 @@ typedef struct AVClass {
      * available since version (52.12)
      */
     int (*query_ranges)(struct AVOptionRanges **, void *obj, const char *key, int flags);
+
+    /**
+     * Iterate over the AVClasses corresponding to potential AVOptions-enabled
+     * children.
+     *
+     * @param iter pointer to opaque iteration state. The caller must initialize
+     *             *iter to NULL before the first call.
+     * @return AVClass for the next AVOptions-enabled child or NULL if there are
+     *         no more such children.
+     *
+     * @note The difference between child_next and this is that child_next
+     *       iterates over _already existing_ objects, while child_class_iterate
+     *       iterates over _all possible_ children.
+     */
+    const struct AVClass* (*child_class_iterate)(void **iter);
 } AVClass;
 
 /**
@@ -233,6 +238,27 @@ typedef struct AVClass {
  */
 void av_log(void *avcl, int level, const char *fmt, ...) av_printf_format(3, 4);
 
+/**
+ * Send the specified message to the log once with the initial_level and then with
+ * the subsequent_level. By default, all logging messages are sent to
+ * stderr. This behavior can be altered by setting a different logging callback
+ * function.
+ * @see av_log
+ *
+ * @param avcl A pointer to an arbitrary struct of which the first field is a
+ *        pointer to an AVClass struct or NULL if general log.
+ * @param initial_level importance level of the message expressed using a @ref
+ *        lavu_log_constants "Logging Constant" for the first occurance.
+ * @param subsequent_level importance level of the message expressed using a @ref
+ *        lavu_log_constants "Logging Constant" after the first occurance.
+ * @param fmt The format string (printf-compatible) that specifies how
+ *        subsequent arguments are converted to output.
+ * @param state a variable to keep trak of if a message has already been printed
+ *        this must be initialized to 0 before the first use. The same state
+ *        must not be accessed by 2 Threads simultaneously.
+ */
+void av_log_once(void* avcl, int initial_level, int subsequent_level, int *state, const char *fmt, ...) av_printf_format(5, 6);
+
 
 /**
  * Send the specified message to the log if the level is less than or equal