mov: Rely on box type rather than file type for colr atom

Although it's not allowed to use only allows 'nclc' in ISOM files, there
are samples that do not always respect this rule. This change prevents
atom overread and a spurious color range initialization.
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

libavformat/mov.c

@@ -992,7 +992,7 @@ static int mov_read_colr(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     av_dlog(c->fc, "%s: pri %"PRIu16" trc %"PRIu16" matrix %"PRIu16"",
             color_parameter_type, color_primaries, color_trc, color_matrix);
 
-    if (c->isom) {
+    if (!strncmp(color_parameter_type, "nclx", 4)) {
         uint8_t color_range = avio_r8(pb) >> 7;
         av_dlog(c->fc, " full %"PRIu8"", color_range);
         if (color_range)
@@ -1012,7 +1012,7 @@ static int mov_read_colr(MOVContext *c, AVIOContext *pb, MOVAtom atom)
         st->codec->color_primaries = color_primaries;
         st->codec->color_trc = color_trc;
         st->codec->colorspace = color_matrix;
-    } else {
+    } else if (!strncmp(color_parameter_type, "nclc", 4)) {
         /* color primaries, Table 4-4 */
         switch (color_primaries) {
         case 1: st->codec->color_primaries = AVCOL_PRI_BT709; break;