Merge commit 'fa2a34cd'

* commit 'fa2a34cd':
  lavfi: change the filter registering system to match the other libraries

Conflicts:
	cmdutils.c
	ffplay.c
	libavfilter/avfilter.c
	libavfilter/avfilter.h

This removes the ability to put AVFilters in read only memory and having
them shareable.
Merged-by: Michael Niedermayer <michaelni@gmx.at>

cmdutils.c

@@ -1448,21 +1448,21 @@ int show_protocols(void *optctx, const char *opt, const char *arg)
 
 int show_filters(void *optctx, const char *opt, const char *arg)
 {
-    AVFilter av_unused(**filter) = NULL;
+    const AVFilter av_unused(*filter) = NULL;
     char descr[64], *descr_cur;
     int i, j;
     const AVFilterPad *pad;
 
     printf("Filters:\n");
 #if CONFIG_AVFILTER
-    while ((filter = av_filter_next(filter)) && *filter) {
+    while ((filter = avfilter_next(filter))) {
         descr_cur = descr;
         for (i = 0; i < 2; i++) {
             if (i) {
                 *(descr_cur++) = '-';
                 *(descr_cur++) = '>';
             }
-            pad = i ? (*filter)->outputs : (*filter)->inputs;
+            pad = i ? filter->outputs : filter->inputs;
             for (j = 0; pad && pad[j].name; j++) {
                 if (descr_cur >= descr + sizeof(descr) - 4)
                     break;
@@ -1472,7 +1472,7 @@ int show_filters(void *optctx, const char *opt, const char *arg)
                 *(descr_cur++) = '|';
         }
         *descr_cur = 0;
-        printf("%-16s %-10s %s\n", (*filter)->name, descr, (*filter)->description);
+        printf("%-16s %-10s %s\n", filter->name, descr, filter->description);
     }
 #endif
     return 0;

doc/APIchanges

@@ -171,6 +171,8 @@ API changes, most recent first:
   Add avfilter_init_dict().
   Add AVFilter.flags field and AVFILTER_FLAG_DYNAMIC_{INPUTS,OUTPUTS} flags.
   Add avfilter_pad_count() for counting filter inputs/outputs.
+  Add avfilter_next(), deprecate av_filter_next().
+  Deprecate avfilter_uninit().
 
 2013-xx-xx - lavfi 3.7.0 - avfilter.h
   Add AVFilter.priv_class for exporting filter options through the AVOptions API

ffmpeg.c

@@ -499,7 +499,6 @@ static void exit_program(void)
 
     uninit_opts();
 
-    avfilter_uninit();
     avformat_network_deinit();
 
     if (received_sigterm) {

ffplay.c

@@ -1027,7 +1027,6 @@ static void do_exit(VideoState *is)
     av_lockmgr_register(NULL);
     uninit_opts();
 #if CONFIG_AVFILTER
-    avfilter_uninit();
     av_freep(&vfilters);
 #endif
     avformat_network_deinit();

libavfilter/avfilter.c

@@ -386,55 +386,53 @@ int avfilter_process_command(AVFilterContext *filter, const char *cmd, const cha
     return AVERROR(ENOSYS);
 }
 
-#define MAX_REGISTERED_AVFILTERS_NB 256
-
-static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
-
-static int next_registered_avfilter_idx = 0;
+static AVFilter *first_filter;
 
 AVFilter *avfilter_get_by_name(const char *name)
 {
-    int i;
+    AVFilter *f = NULL;
 
-    for (i = 0; registered_avfilters[i]; i++)
-        if (!strcmp(registered_avfilters[i]->name, name))
-            return registered_avfilters[i];
+    while ((f = avfilter_next(f)))
+        if (!strcmp(f->name, name))
+            return f;
 
     return NULL;
 }
 
 int avfilter_register(AVFilter *filter)
 {
+    AVFilter **f = &first_filter;
     int i;
 
-    if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB) {
-        av_log(NULL, AV_LOG_ERROR,
-               "Maximum number of registered filters %d reached, "
-               "impossible to register filter with name '%s'\n",
-               MAX_REGISTERED_AVFILTERS_NB, filter->name);
-        return AVERROR(ENOMEM);
-    }
-
     for(i=0; filter->inputs && filter->inputs[i].name; i++) {
         const AVFilterPad *input = &filter->inputs[i];
         av_assert0(     !input->filter_frame
                     || (!input->start_frame && !input->end_frame));
     }
 
-    registered_avfilters[next_registered_avfilter_idx++] = filter;
+    while (*f)
+        f = &(*f)->next;
+    *f = filter;
+    filter->next = NULL;
+
     return 0;
 }
 
+const AVFilter *avfilter_next(const AVFilter *prev)
+{
+    return prev ? prev->next : first_filter;
+}
+
+#if FF_API_OLD_FILTER_REGISTER
 AVFilter **av_filter_next(AVFilter **filter)
 {
-    return filter ? ++filter : &registered_avfilters[0];
+    return filter ? &(*filter)->next : &first_filter;
 }
 
 void avfilter_uninit(void)
 {
-    memset(registered_avfilters, 0, sizeof(registered_avfilters));
-    next_registered_avfilter_idx = 0;
 }
+#endif
 
 int avfilter_pad_count(const AVFilterPad *pads)
 {
@@ -463,21 +461,22 @@ static void *filter_child_next(void *obj, void *prev)
 
 static const AVClass *filter_child_class_next(const AVClass *prev)
 {
-    AVFilter **f = NULL;
+    AVFilter *f = NULL;
 
     /* find the filter that corresponds to prev */
-    while (prev && *(f = av_filter_next(f)))
-        if ((*f)->priv_class == prev)
+    while (prev && (f = avfilter_next(f)))
+        if (f->priv_class == prev)
             break;
 
     /* could not find filter corresponding to prev */
-    if (prev && !(*f))
+    if (prev && !f)
         return NULL;
 
     /* find next filter with specific options */
-    while (*(f = av_filter_next(f)))
-        if ((*f)->priv_class)
-            return (*f)->priv_class;
+    while ((f = avfilter_next(f)))
+        if (f->priv_class)
+            return f->priv_class;
+
     return NULL;
 }
 

libavfilter/avfilter.h

@@ -496,6 +496,8 @@ typedef struct AVFilter {
 
     int priv_size;      ///< size of private data to allocate for the filter
 
+    struct AVFilter *next;
+
     /**
      * Make the filter instance process a command.
      *
@@ -837,8 +839,11 @@ int avfilter_process_command(AVFilterContext *filter, const char *cmd, const cha
 /** Initialize the filter system. Register all builtin filters. */
 void avfilter_register_all(void);
 
+#if FF_API_OLD_FILTER_REGISTER
 /** Uninitialize the filter system. Unregister all filters. */
+attribute_deprecated
 void avfilter_uninit(void);
+#endif
 
 /**
  * Register a filter. This is only needed if you plan to use
@@ -861,13 +866,24 @@ int avfilter_register(AVFilter *filter);
  */
 AVFilter *avfilter_get_by_name(const char *name);
 
+/**
+ * Iterate over all registered filters.
+ * @return If prev is non-NULL, next registered filter after prev or NULL if
+ * prev is the last filter. If prev is NULL, return the first registered filter.
+ */
+const AVFilter *avfilter_next(const AVFilter *prev);
+
+#if FF_API_OLD_FILTER_REGISTER
 /**
  * If filter is NULL, returns a pointer to the first registered filter pointer,
  * if filter is non-NULL, returns the next pointer after filter.
  * If the returned pointer points to NULL, the last registered filter
  * was already reached.
+ * @deprecated use avfilter_next()
  */
+attribute_deprecated
 AVFilter **av_filter_next(AVFilter **filter);
+#endif
 
 #if FF_API_AVFILTER_OPEN
 /**

libavfilter/version.h

@@ -75,5 +75,8 @@
 #ifndef FF_API_AVFILTER_INIT_FILTER
 #define FF_API_AVFILTER_INIT_FILTER         (LIBAVFILTER_VERSION_MAJOR < 4)
 #endif
+#ifndef FF_API_OLD_FILTER_REGISTER
+#define FF_API_OLD_FILTER_REGISTER          (LIBAVFILTER_VERSION_MAJOR < 4)
+#endif
 
 #endif /* AVFILTER_VERSION_H */