From 150e99d694f33ab9ad678834964909aa315d14a1 Mon Sep 17 00:00:00 2001
From: Luca Barbato <lu_zero@gentoo.org>
Date: Mon, 20 Feb 2017 00:04:59 +0100
Subject: [PATCH] rtsp: Factor out packet reading

---
 libavformat/rtsp.c | 66 ++++++++++++++++++++++++++++------------------
 1 file changed, 40 insertions(+), 26 deletions(-)

diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index 7e5985719e..e75670867a 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -2043,6 +2043,44 @@ static int pick_stream(AVFormatContext *s, RTSPStream **rtsp_st,
     return AVERROR(EAGAIN);
 }
 
+static int read_packet(AVFormatContext *s,
+                       RTSPStream **rtsp_st, RTSPStream *first_queue_st,
+                       int64_t wait_end)
+{
+    RTSPState *rt = s->priv_data;
+    int len;
+
+    switch(rt->lower_transport) {
+    default:
+#if CONFIG_RTSP_DEMUXER
+    case RTSP_LOWER_TRANSPORT_TCP:
+        len = ff_rtsp_tcp_read_packet(s, rtsp_st, rt->recvbuf, RECVBUF_SIZE);
+        break;
+#endif
+    case RTSP_LOWER_TRANSPORT_UDP:
+    case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
+        len = udp_read_packet(s, rtsp_st, rt->recvbuf, RECVBUF_SIZE, wait_end);
+        if (len > 0 && (*rtsp_st)->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
+            ff_rtp_check_and_send_back_rr((*rtsp_st)->transport_priv, (*rtsp_st)->rtp_handle, NULL, len);
+        break;
+    case RTSP_LOWER_TRANSPORT_CUSTOM:
+        if (first_queue_st && rt->transport == RTSP_TRANSPORT_RTP &&
+            wait_end && wait_end < av_gettime_relative())
+            len = AVERROR(EAGAIN);
+        else
+            len = ffio_read_partial(s->pb, rt->recvbuf, RECVBUF_SIZE);
+        len = pick_stream(s, rtsp_st, rt->recvbuf, len);
+        if (len > 0 && (*rtsp_st)->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
+            ff_rtp_check_and_send_back_rr((*rtsp_st)->transport_priv, NULL, s->pb, len);
+        break;
+    }
+
+    if (len == 0)
+        return AVERROR_EOF;
+
+    return len;
+}
+
 int ff_rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
 {
     RTSPState *rt = s->priv_data;
@@ -2107,30 +2145,7 @@ redo:
             return AVERROR(ENOMEM);
     }
 
-    switch(rt->lower_transport) {
-    default:
-#if CONFIG_RTSP_DEMUXER
-    case RTSP_LOWER_TRANSPORT_TCP:
-        len = ff_rtsp_tcp_read_packet(s, &rtsp_st, rt->recvbuf, RECVBUF_SIZE);
-        break;
-#endif
-    case RTSP_LOWER_TRANSPORT_UDP:
-    case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
-        len = udp_read_packet(s, &rtsp_st, rt->recvbuf, RECVBUF_SIZE, wait_end);
-        if (len > 0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
-            ff_rtp_check_and_send_back_rr(rtsp_st->transport_priv, rtsp_st->rtp_handle, NULL, len);
-        break;
-    case RTSP_LOWER_TRANSPORT_CUSTOM:
-        if (first_queue_st && rt->transport == RTSP_TRANSPORT_RTP &&
-            wait_end && wait_end < av_gettime_relative())
-            len = AVERROR(EAGAIN);
-        else
-            len = ffio_read_partial(s->pb, rt->recvbuf, RECVBUF_SIZE);
-        len = pick_stream(s, &rtsp_st, rt->recvbuf, len);
-        if (len > 0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
-            ff_rtp_check_and_send_back_rr(rtsp_st->transport_priv, NULL, s->pb, len);
-        break;
-    }
+    len = read_packet(s, &rtsp_st, first_queue_st, wait_end);
     if (len == AVERROR(EAGAIN) && first_queue_st &&
         rt->transport == RTSP_TRANSPORT_RTP) {
         av_log(s, AV_LOG_WARNING,
@@ -2141,8 +2156,7 @@ redo:
     }
     if (len < 0)
         return len;
-    if (len == 0)
-        return AVERROR_EOF;
+
     if (rt->transport == RTSP_TRANSPORT_RDT) {
         ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, &rt->recvbuf, len);
     } else if (rt->transport == RTSP_TRANSPORT_RTP) {