Signed-off-by: Nicolas George <geo...@nsup.org>
---
doc/APIchanges | 3 +++
libavutil/frame.c | 17 +++++++++++++++++
libavutil/frame.h | 8 ++++++++
3 files changed, 28 insertions(+)
With the linesize check and without the 1<<.
diff --git a/doc/APIchanges b/doc/APIchanges
index 67a6142401..6d3b573c2d 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -15,6 +15,9 @@ libavutil: 2015-08-28
API changes, most recent first:
+2017-05-18 - xxxxxxxxxx - lavu 55.63.100 - frame.h
+ Add av_frame_check_align().
+
2017-05-15 - xxxxxxxxxx - lavc 57.96.100 - avcodec.h
VideoToolbox hardware-accelerated decoding now supports the new hwaccel API,
which can create the decoder context and allocate hardware frames
automatically.
diff --git a/libavutil/frame.c b/libavutil/frame.c
index 24d5d5f184..aed3cd04ec 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -781,3 +781,20 @@ const char *av_frame_side_data_name(enum
AVFrameSideDataType type)
}
return NULL;
}
+
+int av_frame_check_align(const AVFrame *frame, unsigned align)
+{
+ unsigned mask = align - 1;
+ unsigned i;
+
+ for (i = 0; i < AV_NUM_DATA_POINTERS; i++)
+ if (((intptr_t)frame->data[i] & mask) ||
+ (frame->linesize[i] & mask))
+ return 0;
+ if (!frame->extended_data || frame->extended_data == frame->data)
+ return 1;
+ for (i = AV_NUM_DATA_POINTERS; i < frame->channels; i++)
+ if (((intptr_t)frame->extended_data[i] & mask))
+ return 0;
+ return 1;
+}
diff --git a/libavutil/frame.h b/libavutil/frame.h
index 26261d7e40..1cbf7c7a5a 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -772,6 +772,14 @@ void av_frame_remove_side_data(AVFrame *frame, enum
AVFrameSideDataType type);
const char *av_frame_side_data_name(enum AVFrameSideDataType type);
/**
+ * Check if the data pointers of a frame are aligned enough.
+ * Test if all frame data pointers have the alignment lower bits cleared,
+ * i.e. are a multiple of alignment.
+ * @return >0 if aligned, 0 if not
+ */
+int av_frame_check_align(const AVFrame *frame, unsigned align);
+
+/**
* @}
*/
--
2.11.0
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