asink_abuffer: extend ABufferSinkContext to make it accept lists of formats in input

This is required for the pending lavfi indev extension, also
consistent with the video buffer sink.

libavfilter/asink_abuffer.c

@@ -46,22 +46,18 @@ static int init(AVFilterContext *ctx, const char *args, void *opaque)
 static int query_formats(AVFilterContext *ctx)
 {
     ABufferSinkContext *abuffersink = ctx->priv;
-    AVFilterFormats *formats;
-    int ret;
+    AVFilterFormats *formats = NULL;
 
-    formats = NULL;
-    if ((ret = avfilter_add_format(&formats, abuffersink->sample_fmt)) < 0)
-        return ret;
+    if (!(formats = avfilter_make_format_list(abuffersink->sample_fmts)))
+        return AVERROR(ENOMEM);
     avfilter_set_common_sample_formats(ctx, formats);
 
-    formats = NULL;
-    if ((ret = avfilter_add_format(&formats, abuffersink->channel_layout)) < 0)
-        return ret;
+    if (!(formats = avfilter_make_format64_list(abuffersink->channel_layouts)))
+        return AVERROR(ENOMEM);
     avfilter_set_common_channel_layouts(ctx, formats);
 
-    formats = NULL;
-    if ((ret = avfilter_add_format(&formats, abuffersink->planar)) < 0)
-        return ret;
+    if (!(formats = avfilter_make_format_list(abuffersink->packing_fmts)))
+        return AVERROR(ENOMEM);
     avfilter_set_common_packing_formats(ctx, formats);
 
     return 0;

libavfilter/asink_abuffer.h

@@ -27,9 +27,9 @@
 #include "avfilter.h"
 
 typedef struct {
-    enum AVSampleFormat sample_fmt;
-    int64_t channel_layout;
-    int planar;
+    const enum AVSampleFormat *sample_fmts; ///< list of allowed sample formats,  terminated by -1
+    const int64_t *channel_layouts;         ///< list of allowed channel layouts, terminated by -1
+    const int *packing_fmts;                ///< list of allowed packing formats, terminated by -1
 } ABufferSinkContext;
 
 

libavfilter/avfilter.h

@@ -30,7 +30,7 @@
 
 #define LIBAVFILTER_VERSION_MAJOR  2
 #define LIBAVFILTER_VERSION_MINOR 34
-#define LIBAVFILTER_VERSION_MICRO  1
+#define LIBAVFILTER_VERSION_MICRO  2
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \