[FFmpeg-cvslog] avformat/avisynth: read _SARNum/_SARDen from frame properties

[Stephen Hutchinson]

ffmpeg | branch: master | Stephen Hutchinson <qyot27 at gmail.com> | Sun Aug 28 14:08:55 2022 -0400| [c49beead1926400dadf92e00de906300b41e3d21] | committer: Stephen Hutchinson

avformat/avisynth: read _SARNum/_SARDen from frame properties

Initialized to 1:1, but if the script sets these properties, it
will be set to those instead (0:0 disables it, apparently).

Signed-off-by: Stephen Hutchinson <qyot27 at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c49beead1926400dadf92e00de906300b41e3d21
---

 libavformat/avisynth.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libavformat/avisynth.c b/libavformat/avisynth.c
index 3d9fa2be50..d978e6ec40 100644
--- a/libavformat/avisynth.c
+++ b/libavformat/avisynth.c
@@ -251,6 +251,8 @@ static int avisynth_create_stream_video(AVFormatContext *s, AVStream *st)
     AVS_VideoFrame *frame;
     int error;
     int planar = 0; // 0: packed, 1: YUV, 2: Y8, 3: Planar RGB, 4: YUVA, 5: Planar RGBA
+    int sar_num = 1;
+    int sar_den = 1;
 
     st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
     st->codecpar->codec_id   = AV_CODEC_ID_RAWVIDEO;
@@ -728,6 +730,12 @@ static int avisynth_create_stream_video(AVFormatContext *s, AVStream *st)
                 st->codecpar->chroma_location = AVCHROMA_LOC_UNSPECIFIED;
             }
         }
+
+        /* Sample aspect ratio */
+        sar_num = avs_library.avs_prop_get_int(avs->env, avsmap, "_SARNum", 0, &error);
+        sar_den = avs_library.avs_prop_get_int(avs->env, avsmap, "_SARDen", 0, &error);
+        st->sample_aspect_ratio = (AVRational){ sar_num, sar_den };
+
         avs_library.avs_release_video_frame(frame);
     } else {
         st->codecpar->field_order = AV_FIELD_UNKNOWN;