avutil/stereo3d: set a sane default value for AVRational fields

Prevent potential divisions by 0 when using them immediately after allocation.
Signed-off-by: James Almer <jamrial@gmail.com>

libavutil/stereo3d.c

@@ -26,9 +26,20 @@
 #include "mem.h"
 #include "stereo3d.h"
 
+static void get_defaults(AVStereo3D *stereo)
+{
+    stereo->horizontal_disparity_adjustment = (AVRational) { 0, 1 };
+}
+
 AVStereo3D *av_stereo3d_alloc(void)
 {
-    return av_mallocz(sizeof(AVStereo3D));
+    AVStereo3D *stereo = av_mallocz(sizeof(AVStereo3D));
+    if (!stereo)
+        return NULL;
+
+    get_defaults(stereo);
+
+    return stereo;
 }
 
 AVStereo3D *av_stereo3d_create_side_data(AVFrame *frame)
@@ -40,6 +51,7 @@ AVStereo3D *av_stereo3d_create_side_data(AVFrame *frame)
         return NULL;
 
     memset(side_data->data, 0, sizeof(AVStereo3D));
+    get_defaults((AVStereo3D *)side_data->data);
 
     return (AVStereo3D *)side_data->data;
 }

libavutil/version.h

@@ -80,7 +80,7 @@
 
 #define LIBAVUTIL_VERSION_MAJOR  59
 #define LIBAVUTIL_VERSION_MINOR  24
-#define LIBAVUTIL_VERSION_MICRO 102
+#define LIBAVUTIL_VERSION_MICRO 103
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
                                                LIBAVUTIL_VERSION_MINOR, \

tests/ref/fate/matroska-spherical-mono

@@ -6,7 +6,7 @@ inverted=0
 view=packed
 primary_eye=none
 baseline=0
-horizontal_disparity_adjustment=0/0
+horizontal_disparity_adjustment=0/1
 horizontal_field_of_view=0
 [/SIDE_DATA]
 [SIDE_DATA]

tests/ref/fate/matroska-spherical-mono-remux

@@ -30,7 +30,7 @@ inverted=0
 view=packed
 primary_eye=none
 baseline=0
-horizontal_disparity_adjustment=0/0
+horizontal_disparity_adjustment=0/1
 horizontal_field_of_view=0
 [/SIDE_DATA]
 [SIDE_DATA]
@@ -59,7 +59,7 @@ inverted=0
 view=packed
 primary_eye=none
 baseline=0
-horizontal_disparity_adjustment=0/0
+horizontal_disparity_adjustment=0/1
 horizontal_field_of_view=0
 [/SIDE_DATA]
 [SIDE_DATA]

tests/ref/fate/matroska-stereo_mode

@@ -135,7 +135,7 @@ inverted=0
 view=packed
 primary_eye=none
 baseline=0
-horizontal_disparity_adjustment=0/0
+horizontal_disparity_adjustment=0/1
 horizontal_field_of_view=0
 [/SIDE_DATA]
 [/STREAM]
@@ -155,7 +155,7 @@ inverted=1
 view=packed
 primary_eye=none
 baseline=0
-horizontal_disparity_adjustment=0/0
+horizontal_disparity_adjustment=0/1
 horizontal_field_of_view=0
 [/SIDE_DATA]
 [/STREAM]
@@ -173,7 +173,7 @@ inverted=1
 view=packed
 primary_eye=none
 baseline=0
-horizontal_disparity_adjustment=0/0
+horizontal_disparity_adjustment=0/1
 horizontal_field_of_view=0
 [/SIDE_DATA]
 [/STREAM]
@@ -192,7 +192,7 @@ inverted=1
 view=packed
 primary_eye=none
 baseline=0
-horizontal_disparity_adjustment=0/0
+horizontal_disparity_adjustment=0/1
 horizontal_field_of_view=0
 [/SIDE_DATA]
 [/STREAM]

tests/ref/fate/matroska-vp8-alpha-remux

@@ -38,7 +38,7 @@ inverted=0
 view=packed
 primary_eye=none
 baseline=0
-horizontal_disparity_adjustment=0/0
+horizontal_disparity_adjustment=0/1
 horizontal_field_of_view=0
 [/SIDE_DATA]
 [/STREAM]

tests/ref/fate/mov-spherical-mono

@@ -6,7 +6,7 @@ inverted=0
 view=packed
 primary_eye=none
 baseline=0
-horizontal_disparity_adjustment=0/0
+horizontal_disparity_adjustment=0/1
 horizontal_field_of_view=0
 [/SIDE_DATA]
 [SIDE_DATA]