Split the sdp_read_packet() function out of rtsp_read_packet().

This allows to avoid compiling RTSP code when not needed.

Originally committed as revision 20526 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/rtsp.c

@@ -43,6 +43,8 @@
 //#define DEBUG
 //#define DEBUG_RTP_TCP
 
+static int tcp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
+                           uint8_t *buf, int buf_size);
 static int rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
                            unsigned char **content_ptr,
                            int return_on_interleaved_data);
@@ -609,6 +611,63 @@ static int udp_read_packet(AVFormatContext *s, RTSPStream **prtsp_st,
     }
 }
 
+static int sdp_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    RTSPState *rt = s->priv_data;
+    int ret, len;
+    uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
+    RTSPStream *rtsp_st;
+
+    /* get next frames from the same RTP packet */
+    if (rt->cur_transport_priv) {
+        if (rt->transport == RTSP_TRANSPORT_RDT)
+            ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
+        else
+            ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
+        if (ret == 0) {
+            rt->cur_transport_priv = NULL;
+            return 0;
+        } else if (ret == 1) {
+            return 0;
+        } else {
+            rt->cur_transport_priv = NULL;
+        }
+    }
+
+    /* read next RTP packet */
+ redo:
+    switch(rt->lower_transport) {
+    default:
+#if CONFIG_RTSP_DEMUXER
+    case RTSP_LOWER_TRANSPORT_TCP:
+        len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
+        break;
+#endif
+    case RTSP_LOWER_TRANSPORT_UDP:
+    case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
+        len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
+        if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
+            rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
+        break;
+    }
+    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, buf, len);
+    else
+        ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
+    if (ret < 0)
+        goto redo;
+    if (ret == 1) {
+        /* more packets may follow, so we save the RTP context */
+        rt->cur_transport_priv = rtsp_st->transport_priv;
+    }
+
+    return ret;
+}
+
 /* close and free RTSP streams */
 static void rtsp_close_streams(RTSPState *rt)
 {
@@ -1498,9 +1557,7 @@ static int rtsp_read_packet(AVFormatContext *s,
                             AVPacket *pkt)
 {
     RTSPState *rt = s->priv_data;
-    RTSPStream *rtsp_st;
-    int ret, len;
-    uint8_t buf[10 * RTP_MAX_PACKET_LENGTH];
+    int ret;
     RTSPMessageHeader reply1, *reply = &reply1;
     char cmd[1024];
 
@@ -1564,49 +1621,9 @@ static int rtsp_read_packet(AVFormatContext *s,
         }
     }
 
-    /* get next frames from the same RTP packet */
-    if (rt->cur_transport_priv) {
-        if (rt->transport == RTSP_TRANSPORT_RDT)
-            ret = ff_rdt_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
-        else
-            ret = rtp_parse_packet(rt->cur_transport_priv, pkt, NULL, 0);
-        if (ret == 0) {
-            rt->cur_transport_priv = NULL;
-            return 0;
-        } else if (ret == 1) {
-            return 0;
-        } else {
-            rt->cur_transport_priv = NULL;
-        }
-    }
-
-    /* read next RTP packet */
- redo:
-    switch(rt->lower_transport) {
-    default:
-    case RTSP_LOWER_TRANSPORT_TCP:
-        len = tcp_read_packet(s, &rtsp_st, buf, sizeof(buf));
-        break;
-    case RTSP_LOWER_TRANSPORT_UDP:
-    case RTSP_LOWER_TRANSPORT_UDP_MULTICAST:
-        len = udp_read_packet(s, &rtsp_st, buf, sizeof(buf));
-        if (len >=0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
-            rtp_check_and_send_back_rr(rtsp_st->transport_priv, len);
-        break;
-    }
-    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, buf, len);
-    else
-        ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
-    if (ret < 0)
-        goto redo;
-    if (ret == 1) {
-        /* more packets may follow, so we save the RTP context */
-        rt->cur_transport_priv = rtsp_st->transport_priv;
+    ret = sdp_read_packet(s, pkt);
+    if (ret < 0) {
+        return ret;
     }
 
     /* send dummy request to keep TCP connection alive */
@@ -1777,12 +1794,6 @@ static int sdp_read_header(AVFormatContext *s,
     return err;
 }
 
-static int sdp_read_packet(AVFormatContext *s,
-                            AVPacket *pkt)
-{
-    return rtsp_read_packet(s, pkt);
-}
-
 static int sdp_read_close(AVFormatContext *s)
 {
     RTSPState *rt = s->priv_data;