From 241c71a49ee4957aabab6261351d8b875ce3d41c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20B=C5=93sch?= <u@pkh.me>
Date: Sat, 19 Apr 2014 07:05:21 +0200
Subject: [PATCH] ffplay: support rotated video.

Trolled-by: Linus Torvalds
---
 doc/ffplay.texi |  4 ++++
 ffplay.c        | 47 +++++++++++++++++++++++++++++++++++++++--------
 2 files changed, 43 insertions(+), 8 deletions(-)

diff --git a/doc/ffplay.texi b/doc/ffplay.texi
index c26c68d..d73eadb 100644
--- a/doc/ffplay.texi
+++ b/doc/ffplay.texi
@@ -159,6 +159,10 @@ Force a specific video decoder.
 
 @item -scodec @var{codec_name}
 Force a specific subtitle decoder.
+
+@item -autorotate
+Automatically rotate the video according to presentation metadata. Set by
+default, use -noautorotate to disable.
 @end table
 
 @section While playing
diff --git a/ffplay.c b/ffplay.c
index 86b9126..520b337 100644
--- a/ffplay.c
+++ b/ffplay.c
@@ -327,6 +327,7 @@ static int cursor_hidden = 0;
 static char *vfilters = NULL;
 static char *afilters = NULL;
 #endif
+static int autorotate = 1;
 
 /* current context */
 static int is_full_screen;
@@ -1773,7 +1774,7 @@ static int configure_video_filters(AVFilterGraph *graph, VideoState *is, const c
     char sws_flags_str[128];
     char buffersrc_args[256];
     int ret;
-    AVFilterContext *filt_src = NULL, *filt_out = NULL, *filt_crop;
+    AVFilterContext *filt_src = NULL, *filt_out = NULL, *last_filter = NULL;
     AVCodecContext *codec = is->video_st->codec;
     AVRational fr = av_guess_frame_rate(is->ic, is->video_st, NULL);
 
@@ -1804,16 +1805,45 @@ static int configure_video_filters(AVFilterGraph *graph, VideoState *is, const c
     if ((ret = av_opt_set_int_list(filt_out, "pix_fmts", pix_fmts,  AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN)) < 0)
         goto fail;
 
+    last_filter = filt_out;
+
+#define INSERT_FILT(name, arg) do {                                         \
+    AVFilterContext *filt_ctx;                                              \
+                                                                            \
+    ret = avfilter_graph_create_filter(&filt_ctx,                           \
+                                       avfilter_get_by_name(name),          \
+                                       "ffplay_" name, arg, NULL, graph);   \
+    if (ret < 0)                                                            \
+        goto fail;                                                          \
+                                                                            \
+    ret = avfilter_link(filt_ctx, 0, last_filter, 0);                       \
+    if (ret < 0)                                                            \
+        goto fail;                                                          \
+                                                                            \
+    last_filter = filt_ctx;                                                 \
+} while (0)
+
     /* SDL YUV code is not handling odd width/height for some driver
      * combinations, therefore we crop the picture to an even width/height. */
-    if ((ret = avfilter_graph_create_filter(&filt_crop,
-                                            avfilter_get_by_name("crop"),
-                                            "ffplay_crop", "floor(in_w/2)*2:floor(in_h/2)*2", NULL, graph)) < 0)
-        goto fail;
-    if ((ret = avfilter_link(filt_crop, 0, filt_out, 0)) < 0)
-        goto fail;
+    INSERT_FILT("crop", "floor(in_w/2)*2:floor(in_h/2)*2");
+
+    if (autorotate) {
+        AVDictionaryEntry *rotate_tag = av_dict_get(is->video_st->metadata, "rotate", NULL, 0);
+        if (rotate_tag) {
+            if (!strcmp(rotate_tag->value, "90")) {
+                INSERT_FILT("transpose", "1");
+            } else if (!strcmp(rotate_tag->value, "180")) {
+                INSERT_FILT("hflip", NULL);
+                INSERT_FILT("vflip", NULL);
+            } else if (!strcmp(rotate_tag->value, "270")) {
+                INSERT_FILT("transpose", "2");
+            } else {
+                INSERT_FILT("rotate", rotate_tag->value);
+            }
+        }
+    }
 
-    if ((ret = configure_filtergraph(graph, vfilters, filt_src, filt_crop)) < 0)
+    if ((ret = configure_filtergraph(graph, vfilters, filt_src, last_filter)) < 0)
         goto fail;
 
     is->in_video_filter  = filt_src;
@@ -3527,6 +3557,7 @@ static const OptionDef options[] = {
     { "acodec", HAS_ARG | OPT_STRING | OPT_EXPERT, {    &audio_codec_name }, "force audio decoder",    "decoder_name" },
     { "scodec", HAS_ARG | OPT_STRING | OPT_EXPERT, { &subtitle_codec_name }, "force subtitle decoder", "decoder_name" },
     { "vcodec", HAS_ARG | OPT_STRING | OPT_EXPERT, {    &video_codec_name }, "force video decoder",    "decoder_name" },
+    { "autorotate", OPT_BOOL, { &autorotate }, "automatically rotate video", "" },
     { NULL, },
 };
 
-- 
1.9.2