1 files changed, 8 insertions, 8 deletions

diff --git a/libavcodec/vp6.c b/libavcodec/vp6.c
index 8294c72dc0..11c763bd83 100644
--- a/libavcodec/vp6.c
+++ b/libavcodec/vp6.c
@@ -50,7 +50,7 @@ static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
     int vrt_shift = 0;
     int sub_version;
     int rows, cols;
-    int res = 1;
+    int res = 0;
     int separated_coeff = buf[0] & 1;
 
     s->framep[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
@@ -59,11 +59,11 @@ static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
     if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
         sub_version = buf[1] >> 3;
         if (sub_version > 8)
-            return 0;
+            return AVERROR_INVALIDDATA;
         s->filter_header = buf[1] & 0x06;
         if (buf[1] & 1) {
-            av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
-            return 0;
+            av_log_missing_feature(s->avctx, "Interlacing", 0);
+            return AVERROR_PATCHWELCOME;
         }
         if (separated_coeff || !s->filter_header) {
             coeff_offset = AV_RB16(buf+2) - 2;
@@ -77,7 +77,7 @@ static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
         /* buf[5] is number of displayed macroblock cols */
         if (!rows || !cols) {
             av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n", cols << 4, rows << 4);
-            return 0;
+            return AVERROR_INVALIDDATA;
         }
 
         if (!s->macroblocks || /* first frame */
@@ -88,7 +88,7 @@ static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
                 s->avctx->width  -= s->avctx->extradata[0] >> 4;
                 s->avctx->height -= s->avctx->extradata[0] & 0x0F;
             }
-            res = 2;
+            res = VP56_SIZE_CHANGE;
         }
 
         ff_vp56_init_range_decoder(c, buf+6, buf_size-6);
@@ -100,7 +100,7 @@ static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
         s->sub_version = sub_version;
     } else {
         if (!s->sub_version || !s->avctx->coded_width || !s->avctx->coded_height)
-            return 0;
+            return AVERROR_INVALIDDATA;
 
         if (separated_coeff || !s->filter_header) {
             coeff_offset = AV_RB16(buf+1) - 2;
@@ -144,7 +144,7 @@ static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
         if (buf_size < 0) {
             if (s->framep[VP56_FRAME_CURRENT]->key_frame)
                 avcodec_set_dimensions(s->avctx, 0, 0);
-            return 0;
+            return AVERROR_INVALIDDATA;
         }
         if (s->use_huffman) {
             s->parse_coeff = vp6_parse_coeff_huffman;