avfilter/vsrc_testsrc: fill the xv30le alpha bits

As with other pixel formats, set the undefined alpha bits to opaque.

Signed-off-by: James Almer <jamrial@gmail.com>

libavfilter/vsrc_testsrc.c

@@ -1171,7 +1171,8 @@ static void yuvtest_put_pixel(uint8_t *dstp[4], int dst_linesizep[4],
     case AV_PIX_FMT_XV30LE:
         n = (y << ((desc->comp[0].offset*8) + desc->comp[0].shift)) +
             (u << ((desc->comp[1].offset*8) + desc->comp[1].shift)) +
-            (v << ((desc->comp[2].offset*8) + desc->comp[2].shift));
+            (v << ((desc->comp[2].offset*8) + desc->comp[2].shift)) +
+            (3U << (desc->comp[1].shift ? 0 : 30));
         AV_WL32(&dstp[0][i*4 + j*dst_linesizep[0]], n);
         break;
     case AV_PIX_FMT_XV36:

tests/ref/fate/filter-yuvtestsrc-xv30le

@@ -3,8 +3,8 @@
 #codec_id 0: rawvideo
 #dimensions 0: 320x240
 #sar 0: 1/1
-0,          0,          0,        1,   307200, 0xc7a544aa
-0,          1,          1,        1,   307200, 0xc7a544aa
-0,          2,          2,        1,   307200, 0xc7a544aa
-0,          3,          3,        1,   307200, 0xc7a544aa
-0,          4,          4,        1,   307200, 0xc7a544aa
+0,          0,          0,        1,   307200, 0xb20e51d9
+0,          1,          1,        1,   307200, 0xb20e51d9
+0,          2,          2,        1,   307200, 0xb20e51d9
+0,          3,          3,        1,   307200, 0xb20e51d9
+0,          4,          4,        1,   307200, 0xb20e51d9