4xm: simplify code with FFSWAP

[ffmpeg] / libavutil / log.h

diff --git a/libavutil/log.h b/libavutil/log.h
index c823a763eeac9b2c9aa7e0297b5ded0b5352d83c..7b173302f809ef65b86f7cd5a86532f3ef39bd1e 100644 (file)
--- a/libavutil/log.h
+++ b/libavutil/log.h
@@ -23,13 +23,14 @@
 
 #include <stdarg.h>
 #include "avutil.h"
+#include "attributes.h"
 
 /**
  * Describe the class of an AVClass context structure. That is an
  * arbitrary struct of which the first field is a pointer to an
  * AVClass struct (e.g. AVCodecContext, AVFormatContext etc.).
  */
-typedef struct {
+typedef struct AVClass {
     /**
      * The name of the class; usually it is the same name as the
      * context structure type to which the AVClass is associated.
@@ -64,19 +65,28 @@ typedef struct {
     int log_level_offset_offset;
 
     /**
-     * Offset in the structure where a pointer to the parent context for loging is stored.
-     * for example a decoder that uses eval.c could pass its AVCodecContext to eval as such
-     * parent context. And a av_log() implementation could then display the parent context
-     * can be NULL of course
+     * Offset in the structure where a pointer to the parent context for
+     * logging is stored. For example a decoder could pass its AVCodecContext
+     * to eval as such a parent context, which an av_log() implementation
+     * could then leverage to display the parent context.
+     * The offset can be NULL.
      */
     int parent_log_context_offset;
 
     /**
-     * A function for extended searching, e.g. in possible
-     * children objects.
+     * Return next AVOptions-enabled child or NULL
      */
-    const struct AVOption* (*opt_find)(void *obj, const char *name, const char *unit,
-                                       int opt_flags, int search_flags);
+    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);
 } AVClass;
 
 /* av_log API */
@@ -129,11 +139,7 @@ typedef struct {
  * subsequent arguments are converted to output.
  * @see av_vlog
  */
-#ifdef __GNUC__
-void av_log(void *avcl, int level, const char *fmt, ...) __attribute__ ((__format__ (__printf__, 3, 4)));
-#else
-void av_log(void *avcl, int level, const char *fmt, ...);
-#endif
+void av_log(void *avcl, int level, const char *fmt, ...) av_printf_format(3, 4);
 
 void av_vlog(void *avcl, int level, const char *fmt, va_list);
 int av_log_get_level(void);