From: André Cruz <andre.c...@co.sapo.pt>
This is derived from the Matrix Structure metadata in the tkhd atom.
Based on contributions by Dave Badia <dba...@gmail.com>
and Piotr Tomasik <pi...@tomasik.co>.
Fixes Bug 595.
Signed-off-by: Vittorio Giovara <vittorio.giov...@gmail.com>
---
Cleaned up patch.
Vittorio
libavformat/mov.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 9b019e1..f468ead 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -2256,6 +2256,17 @@ static int mov_read_tkhd(MOVContext *c, AVIOContext *pb,
MOVAtom atom)
sc->width = width >> 16;
sc->height = height >> 16;
+ // Assign clockwise rotation values based on transform matrix so that
+ // we can compensate for iPhone orientation during capture.
+ if (display_matrix[1][0] == -65536 && display_matrix[0][1] == 65536)
+ av_dict_set(&st->metadata, "rotatation", "90", 0);
+
+ if (display_matrix[0][0] == -65536 && display_matrix[1][1] == -65536)
+ av_dict_set(&st->metadata, "rotatation", "180", 0);
+
+ if (display_matrix[1][0] == 65536 && display_matrix[0][1] == -65536)
+ av_dict_set(&st->metadata, "rotatation", "270", 0);
+
// transform the display width/height according to the matrix
// skip this if the display matrix is the default identity matrix
// or if it is rotating the picture, ex iPhone 3GS
--
1.7.9.5
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