Handle av_read_frame() EAGAIN return.

Originally committed as revision 16718 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/utils.c

@@ -1493,7 +1493,10 @@ static int av_seek_frame_generic(AVFormatContext *s,
                 return ret;
         }
         for(i=0;; i++) {
-            int ret = av_read_frame(s, &pkt);
+            int ret;
+            do{
+                ret = av_read_frame(s, &pkt);
+            }while(ret == AVERROR(EAGAIN));
             if(ret<0)
                 break;
             av_free_packet(&pkt);
@@ -1718,7 +1721,9 @@ static void av_estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset
         if (i == ic->nb_streams)
             break;
 
-        ret = av_read_packet(ic, pkt);
+        do{
+            ret = av_read_packet(ic, pkt);
+        }while(ret == AVERROR(EAGAIN));
         if (ret != 0)
             break;
         read_size += pkt->size;
@@ -1743,7 +1748,9 @@ static void av_estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset
         if (read_size >= DURATION_MAX_READ_SIZE)
             break;
 
-        ret = av_read_packet(ic, pkt);
+        do{
+            ret = av_read_packet(ic, pkt);
+        }while(ret == AVERROR(EAGAIN));
         if (ret != 0)
             break;
         read_size += pkt->size;
@@ -2044,6 +2051,8 @@ int av_find_stream_info(AVFormatContext *ic)
         /* NOTE: a new stream can be added there if no header in file
            (AVFMTCTX_NOHEADER) */
         ret = av_read_frame_internal(ic, &pkt1);
+        if(ret == AVERROR(EAGAIN))
+            continue;
         if (ret < 0) {
             /* EOF or error */
             ret = -1; /* we could not have all the codec parameters before EOF */