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优化MediaSource遍历性能

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This commit is contained in:
xiongziliang 2021-06-30 23:03:27 +08:00
parent 69c3b24d06
commit c470016316
1 changed files with 38 additions and 39 deletions
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77
src/Common/MediaSource.cpp
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@ -206,55 +206,54 @@ bool MediaSource::stopSendRtp(const string &ssrc) {
return listener->stopSendRtp(*this, ssrc);
}
static void do_for_each(const function<void(const MediaSource::Ptr &src)> &cb, weak_ptr<MediaSource> &ptr){
auto src = ptr.lock();
if (src) {
cb(src);
template<typename MAP, typename LIST, typename First, typename ...KeyTypes>
static void for_each_media_l(const MAP &map, LIST &list, const First &first, const KeyTypes &...keys) {
if (first.empty()) {
for (auto &pr : map) {
for_each_media_l(pr.second, list, keys...);
}
return;
}
auto it = map.find(first);
if (it != map.end()) {
for_each_media_l(it->second, list, keys...);
}
}
void MediaSource::for_each_media(const function<void(const MediaSource::Ptr &src)> &cb,
template<typename LIST, typename Ptr>
static void emplace_back(LIST &list, const Ptr &ptr) {
auto src = ptr.lock();
if (src) {
list.emplace_back(std::move(src));
}
}
template<typename MAP, typename LIST, typename First>
static void for_each_media_l(const MAP &map, LIST &list, const First &first) {
if (first.empty()) {
for (auto &pr : map) {
emplace_back(list, pr.second);
}
return;
}
auto it = map.find(first);
if (it != map.end()) {
emplace_back(list, it->second);
}
}
void MediaSource::for_each_media(const function<void(const Ptr &src)> &cb,
const string &schema,
const string &vhost,
const string &app,
const string &stream) {
decltype(s_media_source_map) copy;
deque<Ptr> src_list;
{
//拷贝s_media_source_map后再遍历，考虑到是高频使用的全局单例锁，并且在上锁时会执行回调代码
//很容易导致多个锁交叉死锁的情况，而且该函数使用频率不高，拷贝开销相对来说是可以接受的
lock_guard<recursive_mutex> lock(s_media_source_mtx);
copy = s_media_source_map;
for_each_media_l(s_media_source_map, src_list, schema, vhost, app, stream);
}
for (auto &pr0 : copy) {
//遍历schema
if (!schema.empty() && pr0.first != schema) {
continue;
}
for (auto &pr1 : pr0.second) {
//遍历vhost
if (!vhost.empty() && pr1.first != vhost) {
continue;
}
for (auto &pr2 : pr1.second) {
//遍历app
if (!app.empty() && pr2.first != app) {
continue;
}
if (!stream.empty()) {
//指定stream id, 那么不用遍历stream
auto it = pr2.second.find(stream);
if (it != pr2.second.end()) {
do_for_each(cb, it->second);
}
continue;
}
for (auto &pr3 : pr2.second) {
//未指定stream id, 遍历stream
do_for_each(cb, pr3.second);
}
}
}
for (auto &src : src_list) {
cb(src);
}
}