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sdp: Add an option for sending RTCP packets to the source of the last packets

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An SDP description normally only contains the target IP address
and port for the packets. This means that we don't really have
any clue where to send the RTCP RR packets - previously they're
sent to the destination IP written in the SDP (at the same port),
which rarely is the actual peer. And if the source for the packets
is on a different port than the destination, it's never correct.

With a new option, we can choose to send the packets to the
address that the latest packet on each socket arrived from.
---
Some may even argue that this should be the default - perhaps,
but I'd rather keep it optional at first. Additionally, I'm not
sure if sending RTCP RR directly back to the source is
desireable for e.g. multicast.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2013-08-13 13:21:35 +03:00
parent 6b58e11a83
commit b56fc18b20
2 changed files with 7 additions and 3 deletions
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8
libavformat/rtsp.c
View File

@ -96,6 +96,7 @@ const AVOption ff_rtsp_options[] = {
static const AVOption sdp_options[] = {
RTSP_FLAG_OPTS("sdp_flags", "SDP flags"),
{ "custom_io", "Use custom IO", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_CUSTOM_IO}, 0, 0, DEC, "rtsp_flags" },
{ "rtcp_to_source", "Send RTCP packets to the source address of received packets", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_RTCP_TO_SOURCE}, 0, 0, DEC, "rtsp_flags" },
RTSP_MEDIATYPE_OPTS("allowed_media_types", "Media types to accept from the server"),
RTSP_REORDERING_OPTS(),
{ NULL },
@ -2172,9 +2173,10 @@ static int sdp_read_header(AVFormatContext *s)
namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
ff_url_join(url, sizeof(url), "rtp", NULL,
namebuf, rtsp_st->sdp_port,
"?localport=%d&ttl=%d&connect=%d", rtsp_st->sdp_port,
rtsp_st->sdp_ttl,
rt->rtsp_flags & RTSP_FLAG_FILTER_SRC ? 1 : 0);
"?localport=%d&ttl=%d&connect=%d&write_to_source=%d",
rtsp_st->sdp_port, rtsp_st->sdp_ttl,
rt->rtsp_flags & RTSP_FLAG_FILTER_SRC ? 1 : 0,
rt->rtsp_flags & RTSP_FLAG_RTCP_TO_SOURCE ? 1 : 0);
append_source_addrs(url, sizeof(url), "sources",
rtsp_st->nb_include_source_addrs,

2
libavformat/rtsp.h
View File

@ -401,6 +401,8 @@ typedef struct RTSPState {
source address and port. */
#define RTSP_FLAG_LISTEN 0x2 /**< Wait for incoming connections. */
#define RTSP_FLAG_CUSTOM_IO 0x4 /**< Do all IO via the AVIOContext. */
#define RTSP_FLAG_RTCP_TO_SOURCE 0x8 /**< Send RTCP packets to the source
address of received packets. */
typedef struct RTSPSource {
char addr[128]; /**< Source-specific multicast include source IP address (from SDP content) */