mxfenc: write optional field dominance flag in picture description

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/mxfenc.c

@@ -73,6 +73,7 @@ typedef struct {
     const UID *codec_ul;
     int order;               ///< interleaving order if dts are equal
     int interlaced;          ///< whether picture is interlaced
+    int field_dominance;     ///< tff=1, bff=2
     int temporal_reordering;
     AVRational aspect_ratio; ///< display aspect ratio
     int closed_gop;          ///< gop is closed, used in mpeg-2 frame parsing
@@ -284,6 +285,7 @@ static const MXFLocalTagPair mxf_local_tag_batch[] = {
     { 0x3208, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x01,0x0B,0x00,0x00,0x00}}, /* Display Height */
     { 0x320E, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x01,0x01,0x01,0x00,0x00,0x00}}, /* Aspect Ratio */
     { 0x3201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x06,0x01,0x00,0x00,0x00,0x00}}, /* Picture Essence Coding */
+    { 0x3212, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x03,0x01,0x06,0x00,0x00,0x00}}, /* Field Dominance (Opt) */
     // CDCI Picture Essence Descriptor
     { 0x3301, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x05,0x03,0x0A,0x00,0x00,0x00}}, /* Component Depth */
     { 0x3302, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x05,0x01,0x05,0x00,0x00,0x00}}, /* Horizontal Subsampling */
@@ -789,8 +791,11 @@ static void mxf_write_cdci_common(AVFormatContext *s, AVStream *st, const UID ke
     int stored_height = (st->codec->height+15)/16*16;
     int display_height;
     int f1, f2;
+    unsigned desc_size = size+8+8+8+8+8+8+5+16+sc->interlaced*4+12+20;
+    if (sc->interlaced && sc->field_dominance)
+        desc_size += 5;
 
-    mxf_write_generic_desc(s, st, key, size+8+8+8+8+8+8+5+16+sc->interlaced*4+12+20);
+    mxf_write_generic_desc(s, st, key, desc_size);
 
     mxf_write_local_tag(pb, 4, 0x3203);
     avio_wb32(pb, st->codec->width);
@@ -852,6 +857,12 @@ static void mxf_write_cdci_common(AVFormatContext *s, AVStream *st, const UID ke
 
     mxf_write_local_tag(pb, 16, 0x3201);
     avio_write(pb, *sc->codec_ul, 16);
+
+    if (sc->interlaced && sc->field_dominance) {
+        mxf_write_local_tag(pb, 1, 0x3212);
+        avio_w8(pb, sc->field_dominance);
+    }
+
 }
 
 static void mxf_write_cdci_desc(AVFormatContext *s, AVStream *st)
@@ -1328,6 +1339,8 @@ static int mxf_parse_mpeg2_frame(AVFormatContext *s, AVStream *st,
                 st->codec->level   = pkt->data[i+2] >> 4;
             } else if (i + 5 < pkt->size && (pkt->data[i+1] & 0xf0) == 0x80) { // pict coding ext
                 sc->interlaced = !(pkt->data[i+5] & 0x80); // progressive frame
+                if (sc->interlaced)
+                    sc->field_dominance = 1 + !(pkt->data[i+4] & 0x80); // top field first
                 break;
             }
         } else if (c == 0x1b8) { // gop

tests/ref/lavf/mxf

-785e38ddd2466046f30aa36399b8f8fa *./tests/data/lavf/lavf.mxf
+4cc269e1d2066fac03a3d7466f011c8e *./tests/data/lavf/lavf.mxf
 525881 ./tests/data/lavf/lavf.mxf
 ./tests/data/lavf/lavf.mxf CRC=0x4ace0849
-ccaa42c75e653f71604fd28c7c83722d *./tests/data/lavf/lavf.mxf
+87eb6e0e51d31c8ffa414d02672edfa0 *./tests/data/lavf/lavf.mxf
 537657 ./tests/data/lavf/lavf.mxf
 ./tests/data/lavf/lavf.mxf CRC=0x9b928d6b
-c78207030d57b48295b089916849d50d *./tests/data/lavf/lavf.mxf
+52c5b74ecfdc48bd77d79a6bbe62d2de *./tests/data/lavf/lavf.mxf
 525881 ./tests/data/lavf/lavf.mxf
 ./tests/data/lavf/lavf.mxf CRC=0x4ace0849

tests/ref/lavf/mxf_d10

-0d72247067569901a2e351586ddc0b82 *./tests/data/lavf/lavf.mxf_d10
+93237916962c1ecacc8ae3b9e97481fb *./tests/data/lavf/lavf.mxf_d10
 5330989 ./tests/data/lavf/lavf.mxf_d10
 ./tests/data/lavf/lavf.mxf_d10 CRC=0x4474d480