avcodec/libdcadec: honor AVCodecContext bitexact flag

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

libavcodec/libdcadec.c

@@ -167,8 +167,13 @@ static av_cold int dcadec_close(AVCodecContext *avctx)
 static av_cold int dcadec_init(AVCodecContext *avctx)
 {
     DCADecContext *s = avctx->priv_data;
+    int flags = 0;
 
-    s->ctx = dcadec_context_create(0);
+    /* Affects only lossy DTS profiles. DTS-HD MA is always bitexact */
+    if (avctx->flags & CODEC_FLAG_BITEXACT)
+        flags |= DCADEC_FLAG_CORE_BIT_EXACT;
+
+    s->ctx = dcadec_context_create(flags);
     if (!s->ctx)
         return AVERROR(ENOMEM);