[FFmpeg-devel] [PATCH] Extract rotation in MOV metadata

[Dave Badia]

Interrogate MOV metadata for orientation of video so that software can
determine if the video needs to be rotated for proper display.
---
 libavformat/isom.h |    1 +
 libavformat/mov.c  |    5 +++++
 2 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/libavformat/isom.h b/libavformat/isom.h
index 1df666f..dde1ba1 100644
--- a/libavformat/isom.h
+++ b/libavformat/isom.h
@@ -123,6 +123,7 @@ typedef struct MOVStreamContext {
     int width;            ///< tkhd width
     int height;           ///< tkhd height
     int dts_shift;        ///< dts shift when ctts is negative
+    int rotation;         ///< rotation 0 if normal, 180 if inverted
 } MOVStreamContext;

 typedef struct MOVContext {
diff --git a/libavformat/mov.c b/libavformat/mov.c
index e9435a9..7faa225 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -1907,6 +1907,11 @@ static int mov_read_tkhd(MOVContext *c,
AVIOContext *pb, MOVAtom atom)
     sc->width = width >> 16;
     sc->height = height >> 16;

+    if(display_matrix[0][0] == -65536 && display_matrix[1][1] == -65536) {
+       sc->rotation = 180;
+    }
+
+
     // 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