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module-rtp: construct and send SAP

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This commit is contained in:
Wim Taymans 2022-10-05 21:41:51 +02:00
parent 3e57570e9a
commit 84c666db20
1 changed files with 57 additions and 5 deletions
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62
src/modules/module-rtp-sink.c
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@ -109,6 +109,7 @@ PW_LOG_TOPIC_STATIC(mod_topic, "mod." NAME);
#define PW_LOG_TOPIC_DEFAULT mod_topic
#define SAP_INTERVAL_SEC 5
#define SAP_MIME_TYPE "application/sdp"
#define BUFFER_SIZE (1u<<16)
#define BUFFER_MASK (BUFFER_SIZE-1)
@ -164,6 +165,8 @@ struct impl {
struct sockaddr_storage sap_addr;
socklen_t sap_len;
uint16_t msg_id_hash;
struct spa_audio_info_raw info;
uint32_t frame_size;
int payload;
@ -175,6 +178,7 @@ struct impl {
uint8_t buffer[BUFFER_SIZE];
int rtp_fd;
int sap_fd;
};
static void stream_destroy(void *d)
@ -419,14 +423,37 @@ static int get_ip(const struct sockaddr_storage *sa, char *ip, size_t len)
return -EIO;
return 0;
}
static void on_timer_event(void *data, uint64_t expirations)
static void send_sap(struct impl *impl, bool bye)
{
struct impl *impl = data;
char buffer[1024], src_addr[64], dst_addr[64];
char buffer[2048], src_addr[64], dst_addr[64];
const char *user_name = "-", *af, *fmt;
uint32_t ntp;
struct sockaddr *sa = (struct sockaddr*)&impl->src_addr;
struct sap_header header;
struct iovec iov[4];
struct msghdr msg;
spa_zero(header);
header.v = 1;
header.t = bye;
header.msg_id_hash = impl->msg_id_hash;
iov[0].iov_base = &header;
iov[0].iov_len = sizeof(header);
if (sa->sa_family == AF_INET) {
iov[1].iov_base = &((struct sockaddr_in*) sa)->sin_addr;
iov[1].iov_len = 4U;
af = "IP4";
} else {
iov[1].iov_base = &((struct sockaddr_in6*) sa)->sin6_addr;
iov[1].iov_len = 16U;
header.a = 1;
af = "IP6";
}
iov[2].iov_base = SAP_MIME_TYPE;
iov[2].iov_len = sizeof(SAP_MIME_TYPE);
af = impl->src_addr.ss_family == AF_INET ? "IP4" : "IP6";
ntp = (uint32_t) time(NULL) + 2208988800U;
get_ip(&impl->src_addr, src_addr, sizeof(src_addr));
@ -451,7 +478,24 @@ static void on_timer_event(void *data, uint64_t expirations)
impl->port, impl->payload,
impl->payload, fmt, impl->info.rate, impl->info.channels);
pw_log_info("%s", buffer);
iov[3].iov_base = buffer;
iov[3].iov_len = strlen(buffer);
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = iov;
msg.msg_iovlen = 4;
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_flags = 0;
sendmsg(impl->sap_fd, &msg, MSG_NOSIGNAL);
}
static void on_timer_event(void *data, uint64_t expirations)
{
struct impl *impl = data;
send_sap(impl, 0);
}
static int start_sap_announce(struct impl *impl)
@ -464,6 +508,8 @@ static int start_sap_announce(struct impl *impl)
impl->mcast_loop, impl->ttl)) < 0)
return fd;
impl->sap_fd = fd;
pw_log_info("starting SAP timer");
impl->timer = pw_loop_add_timer(impl->loop, on_timer_event, impl);
if (impl->timer == NULL) {
@ -498,6 +544,8 @@ static const struct pw_proxy_events core_proxy_events = {
static void impl_destroy(struct impl *impl)
{
send_sap(impl, 1);
if (impl->stream)
pw_stream_destroy(impl->stream);
@ -509,6 +557,8 @@ static void impl_destroy(struct impl *impl)
if (impl->rtp_fd != -1)
close(impl->rtp_fd);
if (impl->sap_fd != -1)
close(impl->sap_fd);
pw_properties_free(impl->stream_props);
pw_properties_free(impl->props);
@ -663,6 +713,7 @@ int pipewire__module_init(struct pw_impl_module *module, const char *args)
return -errno;
impl->rtp_fd = -1;
impl->sap_fd = -1;
if (args == NULL)
args = "";
@ -730,6 +781,7 @@ int pipewire__module_init(struct pw_impl_module *module, const char *args)
impl->ssrc = rand();
impl->timestamp = rand();
impl->seq = rand();
impl->msg_id_hash = rand();
str = pw_properties_get(props, "local.ifname");
impl->ifname = str ? strdup(str) : NULL;