Merge commit '7cdd737ba81b5c2c9521c4509edf0ac315fabc65'

* commit '7cdd737ba81b5c2c9521c4509edf0ac315fabc65':
  lavfi: mark filters with dynamic number of inputs or outputs with special flags

Merged-by: Michael Niedermayer <michaelni@gmx.at>

6 files changed, 29 insertions, 0 deletions

diff --git a/doc/APIchanges b/doc/APIchanges
index 40af3655d7..8837b0db7e 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -169,6 +169,7 @@ API changes, most recent first:
   filter.
   Add avfilter_init_str(), deprecate avfilter_init_filter().
   Add avfilter_init_dict().
+  Add AVFilter.flags field and AVFILTER_FLAG_DYNAMIC_{INPUTS,OUTPUTS} flags.
 
 2013-xx-xx - lavfi 3.7.0 - avfilter.h
   Add AVFilter.priv_class for exporting filter options through the AVOptions API
diff --git a/libavfilter/af_amix.c b/libavfilter/af_amix.c
index 1981365fec..75736e6544 100644
--- a/libavfilter/af_amix.c
+++ b/libavfilter/af_amix.c
@@ -557,4 +557,6 @@ AVFilter avfilter_af_amix = {
 
     .inputs    = NULL,
     .outputs   = avfilter_af_amix_outputs,
+
+    .flags     = AVFILTER_FLAG_DYNAMIC_INPUTS,
 };
diff --git a/libavfilter/af_channelsplit.c b/libavfilter/af_channelsplit.c
index 89743c6909..e3a30d83c4 100644
--- a/libavfilter/af_channelsplit.c
+++ b/libavfilter/af_channelsplit.c
@@ -146,4 +146,6 @@ AVFilter avfilter_af_channelsplit = {
 
     .inputs  = avfilter_af_channelsplit_inputs,
     .outputs = NULL,
+
+    .flags   = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
 };
diff --git a/libavfilter/af_join.c b/libavfilter/af_join.c
index f3fdccafc1..88aef10b5b 100644
--- a/libavfilter/af_join.c
+++ b/libavfilter/af_join.c
@@ -525,4 +525,6 @@ AVFilter avfilter_af_join = {
 
     .inputs  = NULL,
     .outputs = avfilter_af_join_outputs,
+
+    .flags   = AVFILTER_FLAG_DYNAMIC_INPUTS,
 };
diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index 05effe47de..8dad5dc041 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -411,6 +411,19 @@ const char *avfilter_pad_get_name(const AVFilterPad *pads, int pad_idx);
 enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx);
 
 /**
+ * The number of the filter inputs is not determined just by AVFilter.inputs.
+ * The filter might add additional inputs during initialization depending on the
+ * options supplied to it.
+ */
+#define AVFILTER_FLAG_DYNAMIC_INPUTS        (1 << 0)
+/**
+ * The number of the filter outputs is not determined just by AVFilter.outputs.
+ * The filter might add additional outputs during initialization depending on
+ * the options supplied to it.
+ */
+#define AVFILTER_FLAG_DYNAMIC_OUTPUTS       (1 << 1)
+
+/**
  * Filter definition. This defines the pads a filter contains, and all the
  * callback functions used to interact with the filter.
  */
@@ -432,6 +445,11 @@ typedef struct AVFilter {
      */
     const AVClass *priv_class;
 
+    /**
+     * A combination of AVFILTER_FLAG_*
+     */
+    int flags;
+
     /*****************************************************************
      * All fields below this line are not part of the public API. They
      * may not be used outside of libavfilter and can be changed and
diff --git a/libavfilter/split.c b/libavfilter/split.c
index 39d2da41b5..7268ec107e 100644
--- a/libavfilter/split.c
+++ b/libavfilter/split.c
@@ -133,6 +133,8 @@ AVFilter avfilter_vf_split = {
 
     .inputs    = avfilter_vf_split_inputs,
     .outputs   = NULL,
+
+    .flags     = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
 };
 
 static const AVFilterPad avfilter_af_asplit_inputs[] = {
@@ -157,4 +159,6 @@ AVFilter avfilter_af_asplit = {
 
     .inputs  = avfilter_af_asplit_inputs,
     .outputs = NULL,
+
+    .flags   = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
 };