jpeg2000: Simplify jpeg2000_decode_packets()

Raise PATCHWELCOME error in case of non-implemented progression order.
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
Signed-off-by: Nicolas Bertrand <nicoinattendu@gmail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

libavcodec/jpeg2000dec.c

@@ -722,13 +722,12 @@ static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s,
 
 static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
 {
-    int layno, reslevelno, compno, precno, ok_reslevel, ret;
-    uint8_t prog_order = tile->codsty[0].prog_order;
-    uint16_t x;
-    uint16_t y;
+    int ret = 0;
+    int layno, reslevelno, compno, precno, ok_reslevel;
+    int x, y;
 
     s->bit_index = 8;
-    switch (prog_order) {
+    switch (tile->codsty[0].prog_order) {
     case JPEG2000_PGOD_LRCP:
         for (layno = 0; layno < tile->codsty[0].nlayers; layno++) {
             ok_reslevel = 1;
@@ -802,6 +801,21 @@ static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile
         }
         break;
 
+    case JPEG2000_PGOD_RLCP:
+        avpriv_request_sample(s->avctx, "Progression order RLCP");
+        ret = AVERROR_PATCHWELCOME;
+        break;
+
+    case JPEG2000_PGOD_RPCL:
+        avpriv_request_sample(s->avctx, "Progression order RPCL");
+        ret = AVERROR_PATCHWELCOME;
+        break;
+
+    case JPEG2000_PGOD_PCRL:
+        avpriv_request_sample(s->avctx, "Progression order PCRL");
+        ret = AVERROR_PATCHWELCOME;
+        break;
+
     default:
         break;
     }
@@ -809,7 +823,7 @@ static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile
     /* EOC marker reached */
     bytestream2_skip(&s->g, 2);
 
-    return 0;
+    return ret;
 }
 
 /* TIER-1 routines */