diff --git a/libavfilter/audio.c b/libavfilter/audio.c
index 1768b31184..11b3d0c9c3 100644
--- a/libavfilter/audio.c
+++ b/libavfilter/audio.c
@@ -23,6 +23,7 @@
 #include "libavutil/channel_layout.h"
 #include "libavutil/common.h"
 #include "libavutil/cpu.h"
+#include "libavutil/eval.h"
 
 #include "audio.h"
 #include "avfilter.h"
@@ -107,3 +108,38 @@ AVFrame *ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
 
     return ret;
 }
+
+int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx)
+{
+    char *tail;
+    double srate = av_strtod(arg, &tail);
+    if (*tail || srate < 1 || (int)srate != srate || srate > INT_MAX) {
+        av_log(log_ctx, AV_LOG_ERROR, "Invalid sample rate '%s'\n", arg);
+        return AVERROR(EINVAL);
+    }
+    *ret = srate;
+    return 0;
+}
+
+int ff_parse_channel_layout(AVChannelLayout *ret, int *nret, const char *arg,
+                            void *log_ctx)
+{
+    AVChannelLayout chlayout = { 0 };
+    int res;
+
+    res = av_channel_layout_from_string(&chlayout, arg);
+    if (res < 0) {
+        av_log(log_ctx, AV_LOG_ERROR, "Invalid channel layout '%s'\n", arg);
+        return AVERROR(EINVAL);
+    }
+
+    if (chlayout.order == AV_CHANNEL_ORDER_UNSPEC && !nret) {
+        av_log(log_ctx, AV_LOG_ERROR, "Unknown channel layout '%s' is not supported.\n", arg);
+        return AVERROR(EINVAL);
+    }
+    *ret = chlayout;
+    if (nret)
+        *nret = chlayout.nb_channels;
+
+    return 0;
+}
diff --git a/libavfilter/audio.h b/libavfilter/audio.h
index aab80baa50..881df0cf87 100644
--- a/libavfilter/audio.h
+++ b/libavfilter/audio.h
@@ -47,4 +47,29 @@ AVFrame *ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples);
  */
 AVFrame *ff_get_audio_buffer(AVFilterLink *link, int nb_samples);
 
+/**
+ * Parse a sample rate.
+ *
+ * @param ret unsigned integer pointer to where the value should be written
+ * @param arg string to parse
+ * @param log_ctx log context
+ * @return >= 0 in case of success, a negative AVERROR code on error
+ */
+av_warn_unused_result
+int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx);
+
+/**
+ * Parse a channel layout or a corresponding integer representation.
+ *
+ * @param ret 64bit integer pointer to where the value should be written.
+ * @param nret integer pointer to the number of channels;
+ *             if not NULL, then unknown channel layouts are accepted
+ * @param arg string to parse
+ * @param log_ctx log context
+ * @return >= 0 in case of success, a negative AVERROR code on error
+ */
+av_warn_unused_result
+int ff_parse_channel_layout(AVChannelLayout *ret, int *nret, const char *arg,
+                            void *log_ctx);
+
 #endif /* AVFILTER_AUDIO_H */
diff --git a/libavfilter/formats.c b/libavfilter/formats.c
index 18f7b89104..cd7c68f592 100644
--- a/libavfilter/formats.c
+++ b/libavfilter/formats.c
@@ -22,7 +22,6 @@
 #include "libavutil/avassert.h"
 #include "libavutil/channel_layout.h"
 #include "libavutil/common.h"
-#include "libavutil/eval.h"
 #include "libavutil/mem.h"
 #include "libavutil/pixdesc.h"
 #include "avfilter.h"
@@ -937,43 +936,6 @@ int ff_default_query_formats(AVFilterContext *ctx)
     return 0;
 }
 
-/* internal functions for parsing audio format arguments */
-
-int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx)
-{
-    char *tail;
-    double srate = av_strtod(arg, &tail);
-    if (*tail || srate < 1 || (int)srate != srate || srate > INT_MAX) {
-        av_log(log_ctx, AV_LOG_ERROR, "Invalid sample rate '%s'\n", arg);
-        return AVERROR(EINVAL);
-    }
-    *ret = srate;
-    return 0;
-}
-
-int ff_parse_channel_layout(AVChannelLayout *ret, int *nret, const char *arg,
-                            void *log_ctx)
-{
-    AVChannelLayout chlayout = { 0 };
-    int res;
-
-    res = av_channel_layout_from_string(&chlayout, arg);
-    if (res < 0) {
-        av_log(log_ctx, AV_LOG_ERROR, "Invalid channel layout '%s'\n", arg);
-        return AVERROR(EINVAL);
-    }
-
-    if (chlayout.order == AV_CHANNEL_ORDER_UNSPEC && !nret) {
-        av_log(log_ctx, AV_LOG_ERROR, "Unknown channel layout '%s' is not supported.\n", arg);
-        return AVERROR(EINVAL);
-    }
-    *ret = chlayout;
-    if (nret)
-        *nret = chlayout.nb_channels;
-
-    return 0;
-}
-
 static int check_list(void *log, const char *name, const AVFilterFormats *fmts)
 {
     unsigned i, j;
diff --git a/libavfilter/internal.h b/libavfilter/internal.h
index 343bc0b330..eb312ab485 100644
--- a/libavfilter/internal.h
+++ b/libavfilter/internal.h
@@ -33,33 +33,6 @@
  */
 int ff_fmt_is_regular_yuv(enum AVPixelFormat fmt);
 
-/* Functions to parse audio format arguments */
-
-/**
- * Parse a sample rate.
- *
- * @param ret unsigned integer pointer to where the value should be written
- * @param arg string to parse
- * @param log_ctx log context
- * @return >= 0 in case of success, a negative AVERROR code on error
- */
-av_warn_unused_result
-int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx);
-
-/**
- * Parse a channel layout or a corresponding integer representation.
- *
- * @param ret 64bit integer pointer to where the value should be written.
- * @param nret integer pointer to the number of channels;
- *             if not NULL, then unknown channel layouts are accepted
- * @param arg string to parse
- * @param log_ctx log context
- * @return >= 0 in case of success, a negative AVERROR code on error
- */
-av_warn_unused_result
-int ff_parse_channel_layout(AVChannelLayout *ret, int *nret, const char *arg,
-                            void *log_ctx);
-
 /**
  * Negotiate the media format, dimensions, etc of all inputs to a filter.
  *
diff --git a/libavfilter/tests/formats.c b/libavfilter/tests/formats.c
index ed1de24a4c..5cc3ca3371 100644
--- a/libavfilter/tests/formats.c
+++ b/libavfilter/tests/formats.c
@@ -19,6 +19,7 @@
  */
 
 #include "libavutil/channel_layout.h"
+#include "libavfilter/audio.h"
 #include "libavfilter/formats.c"
 
 #undef printf