From 62d2a75b024bf72e6f3648e33c5bb5baf9018358 Mon Sep 17 00:00:00 2001
From: Piotr Tomasik <piotr@tomasik.co>
Date: Tue, 24 Jan 2012 02:16:41 -0800
Subject: [PATCH] Added clockwise rotate values to metadata for 90 and 270
degrees
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
libavformat/mov.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 06b2f87b0db..133dd895093 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -2156,10 +2156,21 @@ static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
sc->width = width >> 16;
sc->height = height >> 16;
+ //Assign clockwise rotate 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, "rotate", "90", 0);
+ }
+
if (display_matrix[0][0] == -65536 && display_matrix[1][1] == -65536) {
av_dict_set(&st->metadata, "rotate", "180", 0);
}
+ if (display_matrix[1][0] == 65536 && display_matrix[0][1] == -65536) {
+ av_dict_set(&st->metadata, "rotate", "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
--
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