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module-rtp-sap: reorganize generation of SDP

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Move the code to recalculate the hash and version into make_sdp. Add a
boolean argument to the make_sdp function. Recalculate the hash and
version when we are making a new SDP and leave the old values if we
are making an SDP to compare against the current one.
This commit is contained in:
Wim Taymans 2025-10-15 14:08:24 +02:00
parent c40e0d1d98
commit b220f85790
1 changed files with 48 additions and 47 deletions
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95
src/modules/module-rtp-sap.c
View file

@ -662,15 +662,24 @@ static bool update_ts_refclk(struct impl *impl)
return gmid_changed;
}
static int make_sdp(struct impl *impl, struct session *sess, char *buffer, size_t buffer_size)
static uint16_t generate_hash(uint16_t prev)
{
uint16_t hash = pw_rand32();
if (hash == prev) hash++;
if (hash == 0) hash++;
return hash;
}
static int make_sdp(struct impl *impl, struct session *sess, char *buffer, size_t buffer_size, bool new)
{
char src_addr[64], dst_addr[64], dst_ttl[8], ptime[32];
struct sdp_info *sdp = &sess->info;
bool src_ip4, dst_ip4;
bool multicast;
const char *user_name;
const char *user_name, *str;
struct spa_strbuf buf;
int res;
struct pw_properties *props = sess->props;
if ((res = pw_net_get_ip(&impl->src_addr, src_addr, sizeof(src_addr), &src_ip4, NULL)) < 0)
return res;
@ -678,6 +687,30 @@ static int make_sdp(struct impl *impl, struct session *sess, char *buffer, size_
if ((res = pw_net_get_ip(&sdp->dst_addr, dst_addr, sizeof(dst_addr), &dst_ip4, NULL)) < 0)
return res;
if (new) {
/* update the version and hash */
sdp->hash = generate_hash(sdp->hash);
if ((str = pw_properties_get(props, "sess.id")) != NULL) {
if (!spa_atou32(str, &sdp->session_id, 10)) {
pw_log_error("Invalid session id: %s (must be a uint32)", str);
return -EINVAL;
}
sdp->t_ntp = pw_properties_get_uint32(props, "rtp.ntp",
(uint32_t) time(NULL) + 2208988800U + impl->n_sessions);
} else {
sdp->session_id = (uint32_t) time(NULL) + 2208988800U + impl->n_sessions;
sdp->t_ntp = pw_properties_get_uint32(props, "rtp.ntp", sdp->session_id);
}
if ((str = pw_properties_get(props, "sess.version")) != NULL) {
if (!spa_atou32(str, &sdp->session_version, 10)) {
pw_log_error("Invalid session version: %s (must be a uint32)", str);
return -EINVAL;
}
} else {
sdp->session_version = sdp->t_ntp;
}
}
if ((user_name = pw_get_user_name()) == NULL)
user_name = "-";
@ -839,7 +872,7 @@ static int send_sap(struct impl *impl, struct session *sess, bool bye)
* socket needs to be open for us to get the interface address (which
* happens above. So let's create the SDP now, if needed. */
if (!sess->has_sdp) {
res = make_sdp(impl, sess, sess->sdp, sizeof(sess->sdp));
res = make_sdp(impl, sess, sess->sdp, sizeof(sess->sdp), true);
if (res != 0) {
pw_log_error("Failed to create SDP: %s", spa_strerror(res));
return res;
@ -887,20 +920,13 @@ static int send_sap(struct impl *impl, struct session *sess, bool bye)
return res;
}
static uint16_t generate_hash(uint16_t prev)
{
uint16_t hash = pw_rand32();
if (hash == prev) hash++;
if (hash == 0) hash++;
return hash;
}
static void on_timer_event(void *data, uint64_t expirations)
{
struct impl *impl = data;
struct session *sess, *tmp;
uint64_t timestamp, interval;
bool clk_changed;
int res;
timestamp = get_time_nsec(impl);
interval = impl->cleanup_interval * SPA_NSEC_PER_SEC;
@ -911,12 +937,12 @@ static void on_timer_event(void *data, uint64_t expirations)
if (clk_changed) {
// The clock has changed: Send bye and create new SDP.
send_sap(impl, sess, 1);
sess->info.hash = generate_hash(sess->info.hash);
int res = make_sdp(impl, sess, sess->sdp, sizeof(sess->sdp));
if (res != 0) {
res = make_sdp(impl, sess, sess->sdp, sizeof(sess->sdp), true);
if (res != 0)
pw_log_error("Failed to create SDP: %s", spa_strerror(res));
}
else
sess->has_sdp = true;
}
send_sap(impl, sess, 0);
} else {
@ -1045,44 +1071,19 @@ static struct session *session_new_announce(struct impl *impl, struct node *node
/* see if we can make an SDP, will fail for the first session because we
* haven't got the SAP socket open yet */
res = make_sdp(impl, sess, buffer, sizeof(buffer));
res = make_sdp(impl, sess, buffer, sizeof(buffer), false);
/* we had no sdp or something changed */
if (!sess->has_sdp || ((res == 0) && strcmp(buffer, sess->sdp) != 0)) {
/* send bye on the old session */
send_sap(impl, sess, 1);
/* update the version and hash */
sdp->hash = generate_hash(sdp->hash);
if ((str = pw_properties_get(props, "sess.id")) != NULL) {
if (!spa_atou32(str, &sdp->session_id, 10)) {
pw_log_error("Invalid session id: %s (must be a uint32)", str);
goto error_free;
}
sdp->t_ntp = pw_properties_get_uint32(props, "rtp.ntp",
(uint32_t) time(NULL) + 2208988800U + impl->n_sessions);
} else {
sdp->session_id = (uint32_t) time(NULL) + 2208988800U + impl->n_sessions;
sdp->t_ntp = pw_properties_get_uint32(props, "rtp.ntp", sdp->session_id);
}
if ((str = pw_properties_get(props, "sess.version")) != NULL) {
if (!spa_atou32(str, &sdp->session_version, 10)) {
pw_log_error("Invalid session version: %s (must be a uint32)", str);
goto error_free;
}
} else {
sdp->session_version = sdp->t_ntp;
}
if (res == 0) {
/* make an updated SDP for sending, this should not actually fail */
res = make_sdp(impl, sess, sess->sdp, sizeof(sess->sdp));
if (res == 0)
sess->has_sdp = true;
else
pw_log_error("Failed to create SDP: %s", spa_strerror(res));
}
/* make an updated SDP for sending, this should not actually fail */
res = make_sdp(impl, sess, sess->sdp, sizeof(sess->sdp), true);
if (res != 0)
pw_log_error("Failed to create SDP: %s", spa_strerror(res));
else
sess->has_sdp = true;
}
send_sap(impl, sess, 0);