Signed-off-by: Brad Hards <br...@frogmouth.net>
---
libavutil/frame.c | 31 +++++++++++++++++++++++++++++++
libavutil/frame.h | 23 +++++++++++++++++++++++
2 files changed, 54 insertions(+)
diff --git a/libavutil/frame.c b/libavutil/frame.c
index 2ec59b44b1..9f9953c2b4 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -625,6 +625,37 @@ AVFrameSideData *av_frame_get_side_data(const AVFrame
*frame,
return NULL;
}
+AVFrameSideData *av_frame_get_side_data_n(const AVFrame *frame,
+ enum AVFrameSideDataType type,
+ const int side_data_instance)
+{
+ int i;
+ int n = 0;
+
+ for (i = 0; i < frame->nb_side_data; i++) {
+ if (frame->side_data[i]->type == type) {
+ if (n == side_data_instance) {
+ return frame->side_data[i];
+ } else {
+ n++;
+ }
+ }
+ }
+ return NULL;
+}
+
+int av_frame_num_side_data(const AVFrame *frame, enum AVFrameSideDataType type)
+{
+ int i;
+ int num = 0;
+ for (i = 0; i < frame->nb_side_data; i++) {
+ if (frame->side_data[i]->type == type) {
+ num += 1;
+ }
+ }
+ return num;
+}
+
static int frame_copy_video(AVFrame *dst, const AVFrame *src)
{
const uint8_t *src_data[4];
diff --git a/libavutil/frame.h b/libavutil/frame.h
index ff2540a20f..8e94e3f679 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -839,11 +839,34 @@ AVFrameSideData *av_frame_new_side_data_from_buf(AVFrame
*frame,
AVFrameSideData *av_frame_get_side_data(const AVFrame *frame,
enum AVFrameSideDataType type);
+/**
+ * Find a specified instance of side data of a given type.
+ *
+ * @param frame a frame to find the side data in
+ * @param type type of the side data to find
+ * @param side_data_instance instance of the side data to return (0 base).
+ *
+ * @return a pointer to the n'th instance of side data of a given type on
+ * success, NULL if there are less than side_data_instance instances of the
+ * given type.
+ */
+AVFrameSideData *av_frame_get_side_data_n(const AVFrame *frame,
+ enum AVFrameSideDataType type,
+ const int side_data_instance);
+
/**
* Remove and free all side data instances of the given type.
*/
void av_frame_remove_side_data(AVFrame *frame, enum AVFrameSideDataType type);
+/**
+ * Get the number of instances of side data of a given type.
+ *
+ * @param frame a frame to find the side data in
+ * @param type type of the side data to find
+ * @return count of instances, which can be 0
+ */
+int av_frame_num_side_data(const AVFrame *frame, enum AVFrameSideDataType
type);
/**
* Flags for frame cropping.
--
2.27.0
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