From e2d50fc2f5f3600e13055acf1a10fec35e941f37 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Wed, 29 Apr 2015 22:28:45 +0300
Subject: [PATCH] avplay: Add support for rotated video
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This is enabled by default, but can be disbled via the -noautorotate
option.

Based on a patch by Clément Bœsch.

Signed-off-by: Martin Storsjö <martin@martin.st>
---
 avplay.c        | 19 +++++++++++++++++++
 configure       |  2 +-
 doc/avplay.texi |  2 ++
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/avplay.c b/avplay.c
index e353a66245..7437bd615c 100644
--- a/avplay.c
+++ b/avplay.c
@@ -27,6 +27,7 @@
 
 #include "libavutil/avstring.h"
 #include "libavutil/colorspace.h"
+#include "libavutil/display.h"
 #include "libavutil/mathematics.h"
 #include "libavutil/pixdesc.h"
 #include "libavutil/imgutils.h"
@@ -265,6 +266,7 @@ static int rdftspeed = 20;
 #if CONFIG_AVFILTER
 static char *vfilters = NULL;
 #endif
+static int autorotate = 1;
 
 /* current context */
 static int is_full_screen;
@@ -1548,6 +1550,22 @@ static int configure_video_filters(AVFilterGraph *graph, VideoState *is, const c
 
     INSERT_FILT("format", "yuv420p");
 
+    if (autorotate) {
+        uint8_t* displaymatrix = av_stream_get_side_data(is->video_st,
+                                                         AV_PKT_DATA_DISPLAYMATRIX, NULL);
+        if (displaymatrix) {
+            double rot = av_display_rotation_get((int32_t*) displaymatrix);
+            if (rot < -135 || rot > 135) {
+                INSERT_FILT("vflip", NULL);
+                INSERT_FILT("hflip", NULL);
+            } else if (rot < -45) {
+                INSERT_FILT("transpose", "dir=clock");
+            } else if (rot > 45) {
+                INSERT_FILT("transpose", "dir=cclock");
+            }
+        }
+    }
+
     if (vfilters) {
         AVFilterInOut *outputs = avfilter_inout_alloc();
         AVFilterInOut *inputs  = avfilter_inout_alloc();
@@ -2928,6 +2946,7 @@ static const OptionDef options[] = {
     { "rdftspeed", OPT_INT | HAS_ARG| OPT_AUDIO | OPT_EXPERT, { &rdftspeed }, "rdft speed", "msecs" },
     { "default", HAS_ARG | OPT_AUDIO | OPT_VIDEO | OPT_EXPERT, { opt_default }, "generic catch all option", "" },
     { "i", 0, { NULL }, "avconv compatibility dummy option", ""},
+    { "autorotate", OPT_BOOL, { &autorotate }, "automatically rotate video", "" },
     { NULL, },
 };
 
diff --git a/configure b/configure
index e2d9642ebb..c5ea29c0d1 100755
--- a/configure
+++ b/configure
@@ -2233,7 +2233,7 @@ avconv_select="aformat_filter anull_filter asyncts_filter atrim_filter format_fi
                setpts_filter trim_filter"
 avplay_deps="avcodec avformat avresample swscale sdl"
 avplay_libs='$sdl_libs'
-avplay_select="rdft"
+avplay_select="rdft transpose_filter hflip_filter vflip_filter"
 avprobe_deps="avcodec avformat"
 
 # documentation
diff --git a/doc/avplay.texi b/doc/avplay.texi
index d526213f17..d143f75201 100644
--- a/doc/avplay.texi
+++ b/doc/avplay.texi
@@ -115,6 +115,8 @@ Do not exit after playback is finished.
 Exit if any key is pressed.
 @item -exitonmousedown
 Exit if any mouse button is pressed.
+@item -noautorotate
+Disable automatically rotating video based on file metadata.
 @end table
 
 @section While playing