lavfi: add avfilter_default_filter_name()

The function is modelled after av_default_item_name(), and will print the
name of the instance filter if defined, otherwise the name of the filter.

This allows to show the instance name in the log, which is useful when
debugging complex filter graphs.

doc/APIchanges

@@ -15,6 +15,9 @@ libavutil:     2011-04-18
 
 API changes, most recent first:
 
+2012-06-04 - xxxxxxx - lafi 2.78.100
+  Add avfilter_default_filter_name() function in avfilter.h.
+
 2012-05-24 - xxxxxxx - lavu 51.54.100
   Move AVPALETTE_SIZE and AVPALETTE_COUNT macros from
   libavcodec/avcodec.h to libavutil/pixfmt.h.

libavfilter/af_aformat.c

@@ -55,7 +55,7 @@ static const AVOption options[] = {
 
 static const AVClass aformat_class = {
     .class_name = "aformat filter",
-    .item_name  = av_default_item_name,
+    .item_name  = avfilter_default_filter_name,
     .option     = options,
     .version    = LIBAVUTIL_VERSION_INT,
     .category = AV_CLASS_CATEGORY_FILTER,

libavfilter/af_amix.c

@@ -186,7 +186,7 @@ static const AVOption options[] = {
 
 static const AVClass amix_class = {
     .class_name = "amix filter",
-    .item_name  = av_default_item_name,
+    .item_name  = avfilter_default_filter_name,
     .option     = options,
     .version    = LIBAVUTIL_VERSION_INT,
 };

libavfilter/af_asyncts.c

@@ -50,7 +50,7 @@ static const AVOption options[] = {
 
 static const AVClass async_class = {
     .class_name = "asyncts filter",
-    .item_name  = av_default_item_name,
+    .item_name  = avfilter_default_filter_name,
     .option     = options,
     .version    = LIBAVUTIL_VERSION_INT,
 };

libavfilter/af_silencedetect.c

@@ -48,14 +48,9 @@ static const AVOption silencedetect_options[] = {
     { NULL },
 };
 
-static const char *silencedetect_get_name(void *ctx)
-{
-    return "silencedetect";
-}
-
 static const AVClass silencedetect_class = {
     .class_name = "SilenceDetectContext",
-    .item_name  = silencedetect_get_name,
+    .item_name  = avfilter_default_filter_name,
     .option     = silencedetect_options,
 };
 

libavfilter/asrc_aevalsrc.c

@@ -78,14 +78,9 @@ static const AVOption eval_options[]= {
 {NULL},
 };
 
-static const char *eval_get_name(void *ctx)
-{
-    return "aevalsrc";
-}
-
 static const AVClass eval_class = {
     "AEvalSrcContext",
-    eval_get_name,
+    avfilter_default_filter_name,
     eval_options
 };
 

libavfilter/asrc_anullsrc.c

@@ -53,14 +53,9 @@ static const AVOption anullsrc_options[]= {
     { NULL },
 };
 
-static const char *anullsrc_get_name(void *ctx)
-{
-    return "anullsrc";
-}
-
 static const AVClass anullsrc_class = {
     "ANullSrcContext",
-    anullsrc_get_name,
+    avfilter_default_filter_name,
     anullsrc_options
 };
 

libavfilter/avfilter.c

@@ -366,15 +366,15 @@ static int pad_count(const AVFilterPad *pads)
     return count;
 }
 
-static const char *filter_name(void *p)
+const char *avfilter_default_filter_name(void *filter_ctx)
 {
-    AVFilterContext *filter = p;
-    return filter->filter->name;
+    AVFilterContext *ctx = filter_ctx;
+    return ctx->name ? ctx->name : ctx->filter->name;
 }
 
 static const AVClass avfilter_class = {
     .class_name = "AVFilter",
-    .item_name  = filter_name,
+    .item_name  = avfilter_default_filter_name,
     .version    = LIBAVUTIL_VERSION_INT,
     .category = AV_CLASS_CATEGORY_FILTER,
 };

libavfilter/avfilter.h

@@ -634,6 +634,12 @@ struct AVFilterContext {
     struct AVFilterCommand *command_queue;
 };
 
+/**
+ * Print the name of the filter given a filter context.
+ */
+const char *avfilter_default_filter_name(void *filter_ctx);
+
+
 #if FF_API_PACKING
 enum AVFilterPacking {
     AVFILTER_PACKED = 0,

libavfilter/avfiltergraph.c

@@ -36,7 +36,7 @@
 
 static const AVClass filtergraph_class = {
     .class_name = "AVFilterGraph",
-    .item_name  = av_default_item_name,
+    .item_name  = avfilter_default_filter_name,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 

libavfilter/buffersrc.c

@@ -255,7 +255,7 @@ static const AVOption audio_options[] = {
 
 static const AVClass abuffer_class = {
     .class_name = "abuffer source",
-    .item_name  = av_default_item_name,
+    .item_name  = avfilter_default_filter_name,
     .option     = audio_options,
     .version    = LIBAVUTIL_VERSION_INT,
     .category   = AV_CLASS_CATEGORY_FILTER,

libavfilter/src_movie.c

@@ -78,14 +78,9 @@ static const AVOption movie_options[]= {
 {NULL},
 };
 
-static const char *movie_get_name(void *ctx)
-{
-    return "movie";
-}
-
 static const AVClass movie_class = {
     "MovieContext",
-    movie_get_name,
+    avfilter_default_filter_name,
     movie_options
 };
 

libavfilter/version.h

@@ -29,7 +29,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  2
-#define LIBAVFILTER_VERSION_MINOR 77
+#define LIBAVFILTER_VERSION_MINOR 78
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

libavfilter/vf_ass.c

@@ -54,14 +54,9 @@ static const AVOption ass_options[] = {
     {NULL},
 };
 
-static const char *ass_get_name(void *ctx)
-{
-    return "ass";
-}
-
 static const AVClass ass_class = {
     "AssContext",
-    ass_get_name,
+    avfilter_default_filter_name,
     ass_options
 };
 

libavfilter/vf_blackdetect.c

@@ -57,14 +57,9 @@ static const AVOption blackdetect_options[] = {
     { NULL },
 };
 
-static const char *blackdetect_get_name(void *ctx)
-{
-    return "blackdetect";
-}
-
 static const AVClass blackdetect_class = {
     .class_name = "BlackDetectContext",
-    .item_name  = blackdetect_get_name,
+    .item_name  = avfilter_default_filter_name,
     .option     = blackdetect_options,
 };
 

libavfilter/vf_delogo.c

@@ -149,14 +149,9 @@ static const AVOption delogo_options[]= {
     {NULL},
 };
 
-static const char *delogo_get_name(void *ctx)
-{
-    return "delogo";
-}
-
 static const AVClass delogo_class = {
     .class_name = "DelogoContext",
-    .item_name  = delogo_get_name,
+    .item_name  = avfilter_default_filter_name,
     .option     = delogo_options,
 };
 

libavfilter/vf_drawtext.c

@@ -205,14 +205,9 @@ static const AVOption drawtext_options[]= {
 {NULL},
 };
 
-static const char *drawtext_get_name(void *ctx)
-{
-    return "drawtext";
-}
-
 static const AVClass drawtext_class = {
     "DrawTextContext",
-    drawtext_get_name,
+    avfilter_default_filter_name,
     drawtext_options
 };
 

libavfilter/vf_fade.c

@@ -69,14 +69,9 @@ static const AVOption fade_options[] = {
     {NULL},
 };
 
-static const char *fade_get_name(void *ctx)
-{
-    return "fade";
-}
-
 static const AVClass fade_class = {
     "FadeContext",
-    fade_get_name,
+    avfilter_default_filter_name,
     fade_options
 };
 

libavfilter/vf_fps.c

@@ -60,7 +60,7 @@ static const AVOption options[] = {
 
 static const AVClass class = {
     .class_name = "FPS filter",
-    .item_name  = av_default_item_name,
+    .item_name  = avfilter_default_filter_name,
     .option     = options,
     .version    = LIBAVUTIL_VERSION_INT,
 };

libavfilter/vf_lut.c

@@ -89,14 +89,9 @@ static const AVOption lut_options[] = {
     {NULL},
 };
 
-static const char *lut_get_name(void *ctx)
-{
-    return "lut";
-}
-
 static const AVClass lut_class = {
     "LutContext",
-    lut_get_name,
+    avfilter_default_filter_name,
     lut_options
 };
 

libavfilter/vf_overlay.c

@@ -101,14 +101,9 @@ static const AVOption overlay_options[] = {
     {NULL},
 };
 
-static const char *overlay_get_name(void *ctx)
-{
-    return "overlay";
-}
-
 static const AVClass overlay_class = {
     "OverlayContext",
-    overlay_get_name,
+    avfilter_default_filter_name,
     overlay_options
 };
 

libavfilter/vsrc_cellauto.c

@@ -76,14 +76,9 @@ static const AVOption cellauto_options[] = {
     { NULL },
 };
 
-static const char *cellauto_get_name(void *ctx)
-{
-    return "cellauto";
-}
-
 static const AVClass cellauto_class = {
     "CellAutoContext",
-    cellauto_get_name,
+    avfilter_default_filter_name,
     cellauto_options
 };
 

libavfilter/vsrc_life.c

@@ -95,14 +95,9 @@ static const AVOption life_options[] = {
     { NULL },
 };
 
-static const char *life_get_name(void *ctx)
-{
-    return "life";
-}
-
 static const AVClass life_class = {
     "LifeContext",
-    life_get_name,
+    avfilter_default_filter_name,
     life_options
 };
 

libavfilter/vsrc_mandelbrot.c

@@ -103,14 +103,9 @@ static const AVOption mandelbrot_options[] = {
     {NULL},
 };
 
-static const char *mandelbrot_get_name(void *ctx)
-{
-    return "mandelbrot";
-}
-
 static const AVClass mandelbrot_class = {
     "MBContext",
-    mandelbrot_get_name,
+    avfilter_default_filter_name,
     mandelbrot_options
 };
 

libavfilter/vsrc_mptestsrc.c

@@ -82,14 +82,9 @@ static const AVOption mptestsrc_options[]= {
     { NULL },
 };
 
-static const char *mptestsrc_get_name(void *ctx)
-{
-    return "mptestsrc";
-}
-
 static const AVClass mptestsrc_class = {
     "MPTestContext",
-    mptestsrc_get_name,
+    avfilter_default_filter_name,
     mptestsrc_options
 };
 

libavfilter/vsrc_testsrc.c

@@ -156,14 +156,9 @@ static int request_frame(AVFilterLink *outlink)
 
 #if CONFIG_NULLSRC_FILTER
 
-static const char *nullsrc_get_name(void *ctx)
-{
-    return "nullsrc";
-}
-
 static const AVClass nullsrc_class = {
     .class_name = "NullSourceContext",
-    .item_name  = nullsrc_get_name,
+    .item_name  = avfilter_default_filter_name,
     .option     = testsrc_options,
 };
 
@@ -196,14 +191,9 @@ AVFilter avfilter_vsrc_nullsrc = {
 
 #if CONFIG_TESTSRC_FILTER
 
-static const char *testsrc_get_name(void *ctx)
-{
-    return "testsrc";
-}
-
 static const AVClass testsrc_class = {
     .class_name = "TestSourceContext",
-    .item_name  = testsrc_get_name,
+    .item_name  = avfilter_default_filter_name,
     .option     = testsrc_options,
 };
 
@@ -423,14 +413,9 @@ AVFilter avfilter_vsrc_testsrc = {
 
 #if CONFIG_RGBTESTSRC_FILTER
 
-static const char *rgbtestsrc_get_name(void *ctx)
-{
-    return "rgbtestsrc";
-}
-
 static const AVClass rgbtestsrc_class = {
     .class_name = "RGBTestSourceContext",
-    .item_name  = rgbtestsrc_get_name,
+    .item_name  = avfilter_default_filter_name,
     .option     = testsrc_options,
 };