Revert "avformat/rtp: Pass sources and block filter addresses via sdp file for rtp"

This reverts commit b71685865fe761925feedda3cd0b288224d9a509.

The commit lead to the use of an uninitialized variable.
Other issues were listed by Andreas Rheinhardt:
https://ffmpeg.org/pipermail/ffmpeg-devel/2020-March/259150.html

(cherry picked from commit 8b1f07ef518a0ad9cc6a456bc62869c76fa3461f)

In addition, it is not understandable why the patch that neither
claims to fix a regression nor a security issue was backported.

1 files changed, 9 insertions, 40 deletions

diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index 9c237d5bfd..859defa592 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -2447,8 +2447,8 @@ static int rtp_probe(const AVProbeData *p)
 static int rtp_read_header(AVFormatContext *s)
 {
     uint8_t recvbuf[RTP_MAX_PACKET_LENGTH];
-    char host[500], sdp[1000], filters_buf[1000];
-    int ret, port, sdp_length, nc;
+    char host[500], sdp[500];
+    int ret, port;
     URLContext* in = NULL;
     int payload_type;
     AVCodecParameters *par = NULL;
@@ -2456,7 +2456,6 @@ static int rtp_read_header(AVFormatContext *s)
     AVIOContext pb;
     socklen_t addrlen = sizeof(addr);
     RTSPState *rt = s->priv_data;
-    const char *p;
 
     if (!ff_network_init())
         return AVERROR(EIO);
@@ -2514,40 +2513,13 @@ static int rtp_read_header(AVFormatContext *s)
     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port,
                  NULL, 0, s->url);
 
-    sdp_length = snprintf(sdp + sdp_length, sizeof(sdp) - sdp_length,
-                          "v=0\r\nc=IN IP%d %s\r\n",
-                          addr.ss_family == AF_INET ? 4 : 6, host);
-
-    p = strchr(s->url, '?');
-    if (p) {
-        static const char *filters[][2] = {{"sources", "incl"}, {"block", "excl"}, {NULL, NULL}};
-        int i;
-        char *q;
-        for (i = 0; filters[i][0]; i++) {
-            if (av_find_info_tag(filters_buf, sizeof(filters_buf), filters[i][0], p)) {
-                q = filters_buf;
-                while ((q = strchr(q, ',')) != NULL)
-                    *q = ' ';
-                nc = snprintf(sdp + sdp_length, sizeof(sdp) - sdp_length,
-                          "a=source-filter:%s IN IP%d %s %s\r\n",
-                          filters[i][1],
-                          addr.ss_family == AF_INET ? 4 : 6, host,
-                          filters_buf);
-                if (nc < 0 || nc + sdp_length >= sizeof(sdp))
-                    goto fail_nobuf;
-                sdp_length += nc;
-            }
-        }
-    }
-
-    nc = snprintf(sdp + sdp_length, sizeof(sdp) - sdp_length,
-                  "m=%s %d RTP/AVP %d\r\n",
-                  par->codec_type == AVMEDIA_TYPE_DATA  ? "application" :
-                  par->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio",
-                  port, payload_type);
-    if (nc < 0 || nc + sdp_length >= sizeof(sdp))
-        goto fail_nobuf;
-    sdp_length += nc;
+    snprintf(sdp, sizeof(sdp),
+             "v=0\r\nc=IN IP%d %s\r\nm=%s %d RTP/AVP %d\r\n",
+             addr.ss_family == AF_INET ? 4 : 6, host,
+             par->codec_type == AVMEDIA_TYPE_DATA  ? "application" :
+             par->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio",
+             port, payload_type);
+    av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", sdp);
     avcodec_parameters_free(&par);
 
     ffio_init_context(&pb, sdp, strlen(sdp), 0, NULL, NULL, NULL, NULL);
@@ -2562,9 +2534,6 @@ static int rtp_read_header(AVFormatContext *s)
     s->pb = NULL;
     return ret;
 
-fail_nobuf:
-    ret = AVERROR(ENOBUFS);
-    av_log(s, AV_LOG_ERROR, "rtp_read_header(): not enough buffer space for sdp-headers\n");
 fail:
     avcodec_parameters_free(&par);
     if (in)