@@ -205,7 +205,7 @@ int avfilter_config_links(AVFilterContext *filter)

     return 0;

 }

-char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)

+static char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)

 {

     snprintf(buf, buf_size, "%s%s%s%s%s%s",

              perms & AV_PERM_READ      ? "r" : "",

@@ -217,7 +217,7 @@ char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)

     return buf;

 }

-void ff_dprintf_ref(void *ctx, AVFilterBufferRef *ref, int end)

+static void ff_dprintf_ref(void *ctx, AVFilterBufferRef *ref, int end)

 {

     av_unused char buf[16];

     dprintf(ctx,

@@ -245,7 +245,7 @@ void ff_dprintf_ref(void *ctx, AVFilterBufferRef *ref, int end)

     dprintf(ctx, "]%s", end ? "\n" : "");

 }

-void ff_dprintf_link(void *ctx, AVFilterLink *link, int end)

+static void ff_dprintf_link(void *ctx, AVFilterLink *link, int end)

 {

     if (link->type == AVMEDIA_TYPE_VIDEO) {

         dprintf(ctx,

@@ -269,6 +269,8 @@ void ff_dprintf_link(void *ctx, AVFilterLink *link, int end)

     }

 }

+#define FF_DPRINTF_START(ctx, func) dprintf(NULL, "%-16s: ", #func)

+

 AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)

 {

     AVFilterBufferRef *ret = NULL;

@@ -27,14 +27,6 @@

 #include "avfilter.h"

 #include "avfiltergraph.h"

-void ff_dprintf_ref(void *ctx, AVFilterBufferRef *ref, int end);

-

-char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms);

-

-void ff_dprintf_link(void *ctx, AVFilterLink *link, int end);

-

-#define FF_DPRINTF_START(ctx, func) dprintf(NULL, "%-16s: ", #func)

-

 /**

  * Check for the validity of graph.

  *