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rtp: take into account ipv4/ipv6 when calculating header size

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Calculate the header_size based on the IP version instead of using a
hardcoded value.

Fixes #4524
This commit is contained in:
Wim Taymans 2025-01-24 12:43:34 +01:00
parent 180967bb64
commit 830bd19ca2
4 changed files with 22 additions and 4 deletions
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5
src/modules/module-rtp-sink.c
View file

@ -487,6 +487,7 @@ int pipewire__module_init(struct pw_impl_module *module, const char *args)
const char *str, *sess_name;
int64_t ts_offset;
int res = 0;
uint32_t header_size;
PW_LOG_TOPIC_INIT(mod_topic);
@ -584,6 +585,10 @@ int pipewire__module_init(struct pw_impl_module *module, const char *args)
ts_offset = pw_rand32();
pw_properties_setf(stream_props, "rtp.sender-ts-offset", "%u", (uint32_t)ts_offset);
header_size = impl->dst_addr.ss_family == AF_INET ?
IP4_HEADER_SIZE : IP6_HEADER_SIZE;
header_size += UDP_HEADER_SIZE;
pw_properties_setf(stream_props, "net.header", "%u", header_size);
pw_net_get_ip(&impl->src_addr, addr, sizeof(addr), NULL, NULL);
pw_properties_set(stream_props, "rtp.source.ip", addr);
pw_net_get_ip(&impl->dst_addr, addr, sizeof(addr), NULL, NULL);

6
src/modules/module-rtp-source.c
View file

@ -564,6 +564,7 @@ int pipewire__module_init(struct pw_impl_module *module, const char *args)
int64_t ts_offset;
char addr[128];
int res = 0;
uint32_t header_size;
PW_LOG_TOPIC_INIT(mod_topic);
@ -644,6 +645,11 @@ int pipewire__module_init(struct pw_impl_module *module, const char *args)
pw_properties_set(stream_props, "rtp.source.ip", addr);
pw_properties_setf(stream_props, "rtp.source.port", "%u", impl->src_port);
header_size = impl->src_addr.ss_family == AF_INET ?
IP4_HEADER_SIZE : IP6_HEADER_SIZE;
header_size += UDP_HEADER_SIZE;
pw_properties_setf(stream_props, "net.header", "%u", header_size);
ts_offset = pw_properties_get_int64(props, "sess.ts-offset", DEFAULT_TS_OFFSET);
if (ts_offset == -1)
ts_offset = pw_rand32();

8
src/modules/module-rtp/stream.c
View file

@ -71,6 +71,7 @@ struct impl {
uint32_t ts_offset;
uint32_t psamples;
uint32_t mtu;
uint32_t header_size;
uint32_t payload_size;
struct spa_ringbuffer ring;
@ -442,11 +443,14 @@ struct rtp_stream *rtp_stream_new(struct pw_core *core,
impl->payload = pw_properties_get_uint32(props, "rtp.payload", impl->payload);
impl->mtu = pw_properties_get_uint32(props, "net.mtu", DEFAULT_MTU);
if (impl->mtu <= PACKET_HEADER_SIZE) {
impl->header_size = pw_properties_get_uint32(props, "net.header", IP4_HEADER_SIZE + UDP_HEADER_SIZE);
impl->header_size += RTP_HEADER_SIZE;
if (impl->mtu <= impl->header_size) {
pw_log_error("invalid MTU %d, using %d", impl->mtu, DEFAULT_MTU);
impl->mtu = DEFAULT_MTU;
}
impl->payload_size = impl->mtu - PACKET_HEADER_SIZE;
impl->payload_size = impl->mtu - impl->header_size;
impl->seq = pw_rand32();

7
src/modules/module-rtp/stream.h
View file

@ -19,8 +19,11 @@ struct rtp_stream;
#define ERROR_MSEC 2.0f
#define DEFAULT_SESS_LATENCY 100.0f
/* 28 bytes IP/UDP, 12 bytes RTP header */
#define PACKET_HEADER_SIZE (12+28)
#define IP4_HEADER_SIZE 20
#define IP6_HEADER_SIZE 40
#define UDP_HEADER_SIZE 8
/* 12 bytes RTP header */
#define RTP_HEADER_SIZE 12
#define DEFAULT_MTU 1280
#define DEFAULT_MIN_PTIME 2.0f