This functions identically to the same field in AVCodecContext.
---
doc/APIchanges | 3 +++
libavfilter/avfilter.c | 2 ++
libavfilter/avfilter.h | 13 +++++++++++++
3 files changed, 18 insertions(+)
diff --git a/doc/APIchanges b/doc/APIchanges
index 677f5f7f1..8f06614fb 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -13,6 +13,9 @@ libavutil: 2017-03-23
API changes, most recent first:
+2017-04-xx - xxxxxxx - lavfi 7.x+1.0 - avfilter.h
+ Add AVFilterContext.extra_hw_frames.
+
2017-04-xx - xxxxxxx - lavc 58.x+1.0 - avcodec.h
Add AVCodecContext.extra_hw_frames.
diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index 83c1a7c20..834eca8b3 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -368,6 +368,8 @@ static const AVOption avfilter_options[] = {
{ "thread_type", "Allowed thread types", OFFSET(thread_type),
AV_OPT_TYPE_FLAGS,
{ .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
{ "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE
}, .unit = "thread_type" },
+ { "extra_hw_frames", "Number of extra hardware frames to allocate for the
user",
+ OFFSET(extra_hw_frames), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX,
FLAGS },
{ NULL },
};
diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index 6df69dbbb..c8f861076 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -311,6 +311,19 @@ struct AVFilterContext {
* hardware context information.
*/
AVBufferRef *hw_device_ctx;
+
+ /**
+ * Sets the number of extra hardware frames which the filter will
+ * allocate on its output links for use in following filters or by
+ * the caller.
+ *
+ * Some hardware filters require all frames that they will use for
+ * output to be defined in advance before filtering starts. For such
+ * filters, any hardware frame pools used for output must therefore be
+ * of fixed size. The extra frames set here are on top of any number
+ * that the filter needs internally in order to operate normally.
+ */
+ int extra_hw_frames;
};
/**
--
2.11.0
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