wav demuxer: return AVERROR_EOF instead of AVERROR(EIO) when the end of

the file is reached normally, without any error.

Originally committed as revision 20143 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/wav.c

@@ -256,7 +256,7 @@ static int wav_read_packet(AVFormatContext *s,
         else
             left = find_tag(s->pb, MKTAG('d', 'a', 't', 'a'));
         if (left < 0)
-            return AVERROR(EIO);
+            return AVERROR_EOF;
         wav->data_end= url_ftell(s->pb) + left;
     }
 

tests/seek.regression.ref

@@ -3740,51 +3740,51 @@ ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
 ret: 0 st:-1 ts:-1.000000 flags:0
 ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
 ret: 0 st:-1 ts:1.894167 flags:1
-ret:-5
+ret:-32
 ret: 0 st: 0 ts:0.788345 flags:0
 ret: 0 st: 0 dts:0.788345 pts:0.788345 pos:69576 size:4096 flags:1
 ret: 0 st: 0 ts:-0.317506 flags:1
 ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
 ret: 0 st:-1 ts:2.576668 flags:0
-ret:-5
+ret:-32
 ret: 0 st:-1 ts:1.470835 flags:1
-ret:-5
+ret:-32
 ret: 0 st: 0 ts:0.365011 flags:0
 ret: 0 st: 0 dts:0.365011 pts:0.365011 pos:32238 size:4096 flags:1
 ret: 0 st: 0 ts:-0.740839 flags:1
 ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
 ret: 0 st:-1 ts:2.153336 flags:0
-ret:-5
+ret:-32
 ret: 0 st:-1 ts:1.047503 flags:1
-ret:-5
+ret:-32
 ret: 0 st: 0 ts:-0.058322 flags:0
 ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
 ret: 0 st: 0 ts:2.835828 flags:1
-ret:-5
+ret:-32
 ret: 0 st:-1 ts:1.730004 flags:0
-ret:-5
+ret:-32
 ret: 0 st:-1 ts:0.624171 flags:1
 ret: 0 st: 0 dts:0.624172 pts:0.624172 pos:55096 size:4096 flags:1
 ret: 0 st: 0 ts:-0.481655 flags:0
 ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
 ret: 0 st: 0 ts:2.412494 flags:1
-ret:-5
+ret:-32
 ret: 0 st:-1 ts:1.306672 flags:0
-ret:-5
+ret:-32
 ret: 0 st:-1 ts:0.200839 flags:1
 ret: 0 st: 0 dts:0.200839 pts:0.200839 pos:17758 size:4096 flags:1
 ret: 0 st: 0 ts:-0.904989 flags:0
 ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
 ret: 0 st: 0 ts:1.989184 flags:1
-ret:-5
+ret:-32
 ret: 0 st:-1 ts:0.883340 flags:0
 ret: 0 st: 0 dts:0.883333 pts:0.883333 pos:77954 size:4096 flags:1
 ret: 0 st:-1 ts:-0.222493 flags:1
 ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
 ret: 0 st: 0 ts:2.671678 flags:0
-ret:-5
+ret:-32
 ret: 0 st: 0 ts:1.565850 flags:1
-ret:-5
+ret:-32
 ret: 0 st:-1 ts:0.460008 flags:0
 ret: 0 st: 0 dts:0.460000 pts:0.460000 pos:40616 size:4096 flags:1
 ret: 0 st:-1 ts:-0.645825 flags:1