mpegts: Move scan test to handle_packets

This fixes an issue where packets which start being read
while reading the header stick around after a seek.
Signed-off-by: Zohar Kelrich <lumimies@gmail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

libavformat/mpegts.c

@@ -1399,7 +1399,22 @@ static int handle_packets(MpegTSContext *ts, int nb_packets)
 {
     AVFormatContext *s = ts->stream;
     uint8_t packet[TS_PACKET_SIZE];
-    int packet_num, ret;
+    int packet_num, ret = 0;
+
+    if (avio_tell(s->pb) != ts->last_pos) {
+        int i;
+        av_dlog("Skipping after seek\n");
+        /* seek detected, flush pes buffer */
+        for (i = 0; i < NB_PID_MAX; i++) {
+            if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
+                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
+                av_freep(&pes->buffer);
+                ts->pids[i]->last_cc = -1;
+                pes->data_index = 0;
+                pes->state = MPEGTS_SKIP; /* skip until pes header */
+            }
+        }
+    }
 
     ts->stop_parse = 0;
     packet_num = 0;
@@ -1411,12 +1426,13 @@ static int handle_packets(MpegTSContext *ts, int nb_packets)
             break;
         ret = read_packet(s, packet, ts->raw_packet_size);
         if (ret != 0)
-            return ret;
+            break;
         ret = handle_packet(ts, packet);
         if (ret != 0)
-            return ret;
+            break;
     }
-    return 0;
+    ts->last_pos = avio_tell(s->pb);
+    return ret;
 }
 
 static int mpegts_probe(AVProbeData *p)
@@ -1630,19 +1646,6 @@ static int mpegts_read_packet(AVFormatContext *s,
     MpegTSContext *ts = s->priv_data;
     int ret, i;
 
-    if (avio_tell(s->pb) != ts->last_pos) {
-        /* seek detected, flush pes buffer */
-        for (i = 0; i < NB_PID_MAX; i++) {
-            if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
-                PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
-                av_freep(&pes->buffer);
-                ts->pids[i]->last_cc = -1;
-                pes->data_index = 0;
-                pes->state = MPEGTS_SKIP; /* skip until pes header */
-            }
-        }
-    }
-
     ts->pkt = pkt;
     ret = handle_packets(ts, 0);
     if (ret < 0) {
@@ -1660,8 +1663,6 @@ static int mpegts_read_packet(AVFormatContext *s,
         }
     }
 
-    ts->last_pos = avio_tell(s->pb);
-
     return ret;
 }