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Added handling of session ID <sess-id> and session version <sess-version> in the Origin ("o=") field of the Sources SDP files.

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Session ID is the Node ID plus the source ID.
Session version is the session ID plus an increasing version identifier.
This fixes issue #10 and allows Dante Controller to properly handle the daemon Sources.
This commit is contained in:
Andrea Bondavalli 2020-06-27 09:32:06 +02:00
parent 3aeed93856
commit cee8823e5c
2 changed files with 49 additions and 19 deletions
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51
daemon/session_manager.cpp
View File

@ -37,7 +37,6 @@
#include "utils.hpp"
#include "session_manager.hpp"
static uint8_t get_codec_word_lenght(const std::string& codec) {
if (codec == "L16") {
return 2;
@ -492,6 +491,10 @@ std::error_code SessionManager::add_source(const StreamSource& source) {
info.refclk_ptp_traceable = source.refclk_ptp_traceable;
info.enabled = source.enabled;
info.io = source.io;
auto ip_addr = htonl(config_->get_ip_addr());
info.session_id = (ip_addr << 16) + (ip_addr >> 16) + source.id;
info.session_version = info.session_id + g_session_version++;
// info.m_ui32PlayOutDelay = 0; // only for Sink
std::unique_lock sources_lock(sources_mutex_);
@ -531,10 +534,14 @@ std::error_code SessionManager::add_source(const StreamSource& source) {
return ret;
}
std::string SessionManager::get_removed_source_sdp_(uint32_t id,
uint32_t addr) const {
std::string sdp("o=- " + std::to_string(id) + " 0 IN IP4 " +
ip::address_v4(addr).to_string() + "\n");
std::string SessionManager::get_removed_source_sdp_(
uint32_t id,
uint32_t src_addr,
uint32_t session_id,
uint32_t session_version) const {
std::string sdp("o=- " + std::to_string(session_id) + " " +
std::to_string(session_version) + " IN IP4 " +
ip::address_v4(src_addr).to_string() + "\n");
return sdp;
}
@ -556,7 +563,7 @@ std::string SessionManager::get_source_sdp_(uint32_t id,
// build SDP
std::stringstream ss;
ss << "v=0\n"
<< "o=- " << static_cast<unsigned>(id) << " 0 IN IP4 "
<< "o=- " << info.session_id << " " << info.session_version << " IN IP4 "
<< ip::address_v4(info.stream.m_ui32SrcIP).to_string() << "\n"
<< "s=" << get_node_id(config_->get_ip_addr()) << " "
<< info.stream.m_cName << "\n"
@ -874,14 +881,15 @@ size_t SessionManager::process_sap() {
for (auto const& [id, info] : sources_) {
if (info.enabled) {
// retrieve current active source SDP
std::string sdp = get_source_sdp_(id, info);
auto sdp = get_source_sdp_(id, info);
// compute source 16bit crc
uint16_t msg_crc =
crc16(reinterpret_cast<const uint8_t*>(sdp.c_str()), sdp.length());
// compute source hash
uint32_t msg_id_hash = (static_cast<uint32_t>(id) << 16) + msg_crc;
// add/update this source in the announced sources
announced_sources_[msg_id_hash] = info.stream.m_ui32RTCPSrcIP;
announced_sources_[msg_id_hash] = {info.stream.m_ui32RTCPSrcIP,
info.session_id, info.session_version};
// add this source to the currently active sources
active_sources.insert(msg_id_hash);
// remove this source from deleted sources (if present)
@ -894,11 +902,15 @@ size_t SessionManager::process_sap() {
}
// check for sources that are no longer announced and send deletion/s
for (auto const& [msg_id_hash, src_addr] : announced_sources_) {
for (auto const& [msg_id_hash, info] : announced_sources_) {
auto src_addr = std::get<0>(info);
auto session_id = std::get<1>(info);
auto session_version = std::get<2>(info);
// check if this source is no longer announced
if (active_sources.find(msg_id_hash) == active_sources.end()) {
// retrieve deleted source SDP
std::string sdp = get_removed_source_sdp_(msg_id_hash >> 16, src_addr);
std::string sdp = get_removed_source_sdp_(msg_id_hash >> 16, src_addr,
session_id, session_version);
// send deletion for this source
sap_.deletion(static_cast<uint16_t>(msg_id_hash), src_addr, sdp);
// update amount of byte sent
@ -926,15 +938,18 @@ size_t SessionManager::process_sap() {
void SessionManager::on_update_sources() {
// trigger sources SDP file update
std::shared_lock sources_lock(sources_mutex_);
for (auto const& [id, info] : sources_) {
sources_mutex_.lock();
for (auto& [id, info] : sources_) {
for (auto cb : update_source_observers) {
info.session_version++;
cb(id, info.stream.m_cName, get_source_sdp_(id, info));
}
}
sources_mutex_.unlock();
g_session_version++;
}
void SessionManager::on_ptp_status_locked() {
void SessionManager::on_ptp_status_locked() const {
// set sample rate, this may require seconds
(void)driver_->set_sample_rate(driver_->get_current_sample_rate());
}
@ -1049,9 +1064,13 @@ bool SessionManager::worker() {
}
// at end, send deletion for all announced sources
for (auto const& [msg_id_hash, src_addr] : announced_sources_) {
for (auto const& [msg_id_hash, info] : announced_sources_) {
auto src_addr = std::get<0>(info);
auto session_id = std::get<1>(info);
auto session_version = std::get<2>(info);
// retrieve deleted source SDP
std::string sdp = get_removed_source_sdp_(msg_id_hash >> 16, src_addr);
std::string sdp = get_removed_source_sdp_(msg_id_hash >> 16, src_addr,
session_id, session_version);
// send deletion for this source
sap_.deletion(static_cast<uint16_t>(msg_id_hash), src_addr, sdp);
}
@ -1060,4 +1079,4 @@ bool SessionManager::worker() {
igmp_.leave(config_->get_ip_addr_str(), ptp_primary_mcast_addr);
return true;
}
}

17
daemon/session_manager.hpp
View File

@ -90,6 +90,8 @@ struct StreamInfo {
bool sink_use_sdp{true};
std::string sink_source;
std::string sink_sdp;
uint32_t session_id{0};
uint32_t session_version{0};
};
class SessionManager {
@ -166,11 +168,14 @@ class SessionManager {
void on_add_sink(const StreamSink& sink, const StreamInfo& info);
void on_remove_sink(const StreamInfo& info);
void on_ptp_status_locked();
void on_ptp_status_locked() const;
void on_update_sources();
std::string get_removed_source_sdp_(uint32_t id, uint32_t src_addr) const;
std::string get_removed_source_sdp_(uint32_t id,
uint32_t src_addr,
uint32_t session_id,
uint32_t session_version) const;
std::string get_source_sdp_(uint32_t id, const StreamInfo& info) const;
StreamSource get_source_(uint8_t id, const StreamInfo& info) const;
StreamSink get_sink_(uint8_t id, const StreamInfo& info) const;
@ -201,7 +206,10 @@ class SessionManager {
mutable std::shared_mutex sinks_mutex_;
/* current announced sources */
std::map<uint32_t /* msg_id_hash */, uint32_t /* src_addr */>
std::map<uint32_t /* msg_id_hash */,
std::tuple<uint32_t /* src_addr */,
uint32_t /* session_id */,
uint32_t /* session_version */> >
announced_sources_;
/* number of deletions sent for a a deleted source */
@ -218,6 +226,9 @@ class SessionManager {
SAP sap_{config_->get_sap_mcast_addr()};
IGMP igmp_;
/* used to handle session versioning */
inline static std::atomic<uint16_t> g_session_version{0};
};
#endif