void add_audio(int64_t pts, std::vector<float> audio);
bool begin_frame(GLuint *y_tex, GLuint *cbcr_tex);
RefCountedGLsync end_frame(int64_t pts, int64_t duration, const std::vector<RefCountedFrame> &input_frames);
void shutdown(); // Blocking.
void add_audio(int64_t pts, std::vector<float> audio);
bool begin_frame(GLuint *y_tex, GLuint *cbcr_tex);
RefCountedGLsync end_frame(int64_t pts, int64_t duration, const std::vector<RefCountedFrame> &input_frames);
void shutdown(); // Blocking.