idcinvideo: if decoding fails return error

Previously if frame decoding failed it would be
silently reported as valid frame.

The fate ref is updated because sample have
truncated last video packet.

While here return meaningful error codes.
Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavcodec/idcinvideo.c

@@ -173,7 +173,7 @@ static av_cold int idcin_decode_init(AVCodecContext *avctx)
     return 0;
 }
 
-static void idcin_decode_vlcs(IdcinContext *s)
+static int idcin_decode_vlcs(IdcinContext *s)
 {
     hnode *hnodes;
     long x, y;
@@ -192,7 +192,7 @@ static void idcin_decode_vlcs(IdcinContext *s)
                 if(!bit_pos) {
                     if(dat_pos >= s->size) {
                         av_log(s->avctx, AV_LOG_ERROR, "Huffman decode error.\n");
-                        return;
+                        return -1;
                     }
                     bit_pos = 8;
                     v = s->buf[dat_pos++];
@@ -207,6 +207,8 @@ static void idcin_decode_vlcs(IdcinContext *s)
             prev = node_num;
         }
     }
+
+    return 0;
 }
 
 static int idcin_decode_frame(AVCodecContext *avctx,
@@ -217,6 +219,7 @@ static int idcin_decode_frame(AVCodecContext *avctx,
     int buf_size = avpkt->size;
     IdcinContext *s = avctx->priv_data;
     const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
+    int ret;
 
     s->buf = buf;
     s->size = buf_size;
@@ -224,12 +227,13 @@ static int idcin_decode_frame(AVCodecContext *avctx,
     if (s->frame.data[0])
         avctx->release_buffer(avctx, &s->frame);
 
-    if (avctx->get_buffer(avctx, &s->frame)) {
+    if ((ret = avctx->get_buffer(avctx, &s->frame))) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
-        return -1;
+        return ret;
     }
 
-    idcin_decode_vlcs(s);
+    if (idcin_decode_vlcs(s))
+        return AVERROR_INVALIDDATA;
 
     if (pal) {
         s->frame.palette_has_changed = 1;

tests/ref/fate/id-cin-video

@@ -104,4 +104,3 @@
 1,      78750,      78750,     1575,     6300, 0xe3bfa403
 0,         51,         51,        1,   230400, 0x488de02d
 1,      80325,      80325,     1575,     6300, 0x2c5bd9c9
-0,         52,         52,        1,   230400, 0x488de02d