SRT: Use thread-safe log for multiple-threading SRT module. (#2474)

* solve srt push bugs

* solve h264 mutiple nalus in srt when obs is configured in zerolatency

* optimize error code

* optimize error code

* optimize error code

* add commemnt:we only skip pps/sps frame and send left nalus in srt

* add commemnt:we only skip pps/sps frame and send left nalus in srt

* optimize srt log system

* update conf

* update srt hpp

Co-authored-by: shiwei <shiwei05@kuaishou.com>

trunk/src/srt/srt_log.cpp

@@ -0,0 +1,36 @@
+#include "srt_log.hpp"
+#include "srt_to_rtmp.hpp"
+#include <string>
+#include <stdint.h>
+#include <stdarg.h>
+
+LOGGER_LEVEL s_log_level = SRT_LOGGER_TRACE_LEVEL;
+static char* srt_log_buffer = new char[LOGGER_BUFFER_SIZE];
+
+void snprintbuffer(char* buffer, size_t size, const char* fmt, ...) {
+    va_list ap;
+ 
+    va_start(ap, fmt);
+    vsnprintf(buffer, size, fmt, ap);
+    va_end(ap);
+
+    return;
+}
+
+void set_srt_log_level(LOGGER_LEVEL level) {
+    s_log_level = level;
+}
+
+LOGGER_LEVEL get_srt_log_level() {
+    return s_log_level;
+}
+
+char* get_srt_log_buffer() {
+    return srt_log_buffer;
+}
+
+void srt_log_output(LOGGER_LEVEL level, const char* buffer) {
+    std::string log_content(buffer);
+    srt2rtmp::get_instance()->insert_log_message(level, log_content);
+    return;
+}