avformat/mov: don't rescale mastering display values from the SmDm atom

Simplifies code.
Reviewed-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: James Almer <jamrial@gmail.com>

libavformat/mov.c

@@ -5288,9 +5288,7 @@ static int mov_read_vpcc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 static int mov_read_smdm(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 {
     MOVStreamContext *sc;
-    const int chroma_den = 50000;
-    const int luma_den = 10000;
-    int i, j, version;
+    int i, version;
 
     if (c->fc->nb_streams < 1)
         return AVERROR_INVALIDDATA;
@@ -5313,17 +5311,15 @@ static int mov_read_smdm(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     if (!sc->mastering)
         return AVERROR(ENOMEM);
 
-    for (i = 0; i < 3; i++)
-        for (j = 0; j < 2; j++)
-            sc->mastering->display_primaries[i][j] =
-                av_make_q(lrint(((double)avio_rb16(pb) / (1 << 16)) * chroma_den), chroma_den);
-    for (i = 0; i < 2; i++)
-        sc->mastering->white_point[i] =
-            av_make_q(lrint(((double)avio_rb16(pb) / (1 << 16)) * chroma_den), chroma_den);
-    sc->mastering->max_luminance =
-        av_make_q(lrint(((double)avio_rb32(pb) / (1 <<  8)) * luma_den), luma_den);
-    sc->mastering->min_luminance =
-        av_make_q(lrint(((double)avio_rb32(pb) / (1 << 14)) * luma_den), luma_den);
+    for (i = 0; i < 3; i++) {
+        sc->mastering->display_primaries[i][0] = av_make_q(avio_rb16(pb), 1 << 16);
+        sc->mastering->display_primaries[i][1] = av_make_q(avio_rb16(pb), 1 << 16);
+    }
+    sc->mastering->white_point[0] = av_make_q(avio_rb16(pb), 1 << 16);
+    sc->mastering->white_point[1] = av_make_q(avio_rb16(pb), 1 << 16);
+
+    sc->mastering->max_luminance = av_make_q(avio_rb32(pb), 1 << 8);
+    sc->mastering->min_luminance = av_make_q(avio_rb32(pb), 1 << 14);
 
     sc->mastering->has_primaries = 1;
     sc->mastering->has_luminance = 1;