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module-rtp-sap: Silently ignore other SSRCs if we know the receiver SSRC

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If we know the receiver SSRC from the SAP, we can happily ignore packets
on other SSRCs.
This commit is contained in:
Arun Raghavan 2025-02-15 16:43:06 -05:00
parent 13e3918f81
commit 25e58995f5
3 changed files with 25 additions and 3 deletions
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8
src/modules/module-rtp/audio.c
View file

@ -197,8 +197,12 @@ invalid_len:
pw_log_warn("invalid RTP length");
return -EINVAL;
unexpected_ssrc:
pw_log_warn("unexpected SSRC (expected %u != %u)",
impl->ssrc, hdr->ssrc);
if (!impl->fixed_ssrc) {
/* We didn't have a configured SSRC, and there's more than one SSRC on
* this address/port pair */
pw_log_warn("unexpected SSRC (expected %u != %u)", impl->ssrc,
hdr->ssrc);
}
return -EINVAL;
}

3
src/modules/module-rtp/stream.c
View file

@ -64,6 +64,7 @@ struct impl {
uint8_t payload;
uint32_t ssrc;
uint16_t seq;
unsigned fixed_ssrc:1;
unsigned have_ssrc:1;
unsigned ignore_ssrc:1;
unsigned have_seq:1;
@ -436,7 +437,7 @@ struct rtp_stream *rtp_stream_new(struct pw_core *core,
impl->ssrc = pw_properties_get_uint32(props, "rtp.sender-ssrc", pw_rand32());
impl->ts_offset = pw_properties_get_uint32(props, "rtp.sender-ts-offset", pw_rand32());
} else {
impl->have_ssrc = pw_properties_fetch_uint32(props, "rtp.receiver-ssrc", &impl->ssrc);
impl->have_ssrc = impl->fixed_ssrc = pw_properties_fetch_uint32(props, "rtp.receiver-ssrc", &impl->ssrc);
if (pw_properties_fetch_uint32(props, "rtp.receiver-ts-offset", &impl->ts_offset) < 0)
impl->direct_timestamp = false;
}