Fix a thread race that would sometimes cause x264 streaming to go awry.

[nageru] / x264_encoder.h

diff --git a/x264_encoder.h b/x264_encoder.h
index c71cba2f373e7bc3864a23224a734a17ffeb9ead..f607a91df8ab4786f1d27a7df25910ceffe6795f 100644 (file)
--- a/x264_encoder.h
+++ b/x264_encoder.h
@@ -16,6 +16,7 @@
 #ifndef _X264ENCODE_H
 #define _X264ENCODE_H 1
 
+#include <sched.h>
 #include <stdint.h>
 #include <x264.h>
 #include <atomic>
@@ -48,7 +49,12 @@ public:
        // Does not block.
        void add_frame(int64_t pts, int64_t duration, const uint8_t *data);
 
-       std::string get_global_headers() const { return global_headers; }
+       std::string get_global_headers() const {
+               while (!x264_init_done) {
+                       sched_yield();
+               }
+               return global_headers;
+       }
 
        void change_bitrate(unsigned rate_kbit) {
                new_bitrate_kbit = rate_kbit;
@@ -75,6 +81,7 @@ private:
        std::string buffered_sei;  // Will be output before first frame, if any.
 
        std::thread encoder_thread;
+       std::atomic<bool> x264_init_done{false};
        std::atomic<bool> should_quit{false};
        x264_t *x264;
        std::unique_ptr<X264SpeedControl> speed_control;