[FFmpeg-devel] [PATCH 4/9] avformat/avisynth: add read_frameprop_field_order option

[Stephen Hutchinson <qyot27@gmail.com>]

Signed-off-by: Stephen Hutchinson <qyot27@gmail.com>
---
 libavformat/avisynth.c | 32 ++++++++++++++++++--------------
 1 file changed, 18 insertions(+), 14 deletions(-)

diff --git a/libavformat/avisynth.c b/libavformat/avisynth.c
index 5d726d70a5..c76b50421c 100644
--- a/libavformat/avisynth.c
+++ b/libavformat/avisynth.c
@@ -104,6 +104,7 @@ typedef struct AviSynthContext {
 
     /* (de)activate reading frame properties */
     int frameprops;
+    int frameprop_field_order;
     int frameprop_sar;
 
     /* Linked list pointers. */
@@ -525,21 +526,23 @@ static int avisynth_create_stream_video(AVFormatContext *s, AVStream *st)
 
         if(avs->frameprops) {
             /* Field order */
-            if(avs_library.avs_prop_get_type(avs->env, avsmap, "_FieldBased") == AVS_PROPTYPE_UNSET) {
-                st->codecpar->field_order = AV_FIELD_UNKNOWN;
-            } else {
-                switch (avs_library.avs_prop_get_int(avs->env, avsmap, "_FieldBased", 0, &error)) {
-                case 0:
-                    st->codecpar->field_order = AV_FIELD_PROGRESSIVE;
-                    break;
-                case 1:
-                    st->codecpar->field_order = AV_FIELD_BB;
-                    break;
-                case 2:
-                    st->codecpar->field_order = AV_FIELD_TT;
-                    break;
-                default:
+            if(avs->frameprop_field_order) {
+                if(avs_library.avs_prop_get_type(avs->env, avsmap, "_FieldBased") == AVS_PROPTYPE_UNSET) {
                     st->codecpar->field_order = AV_FIELD_UNKNOWN;
+                } else {
+                    switch (avs_library.avs_prop_get_int(avs->env, avsmap, "_FieldBased", 0, &error)) {
+                    case 0:
+                        st->codecpar->field_order = AV_FIELD_PROGRESSIVE;
+                        break;
+                    case 1:
+                        st->codecpar->field_order = AV_FIELD_BB;
+                        break;
+                    case 2:
+                        st->codecpar->field_order = AV_FIELD_TT;
+                        break;
+                    default:
+                        st->codecpar->field_order = AV_FIELD_UNKNOWN;
+                    }
                 }
             }
 
@@ -1152,6 +1155,7 @@ static int avisynth_read_seek(AVFormatContext *s, int stream_index,
 #define OFFSET(x) offsetof(AviSynthContext, x)
 static const AVOption avisynth_options[] = {
     { "read_frameprops", "Read frame properties from script (AviSynth+ v3.7.1+).", OFFSET(frameprops), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
+    { "read_frameprop_field_order", "Read field order from script's frame properties (AviSynth+ v3.7.1+).", OFFSET(frameprop_field_order), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
     { "read_frameprop_sar", "Read SAR from script's frame properties (AviSynth+ v3.7.1+).", OFFSET(frameprop_sar), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
     { NULL },
 };
-- 
2.34.1

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