Global variable containing the current frame number in the FLI file. This is useful for synchronising other events with the animation, for instance you could check it in a play_fli() callback function and use it to trigger a sample at a particular point. Example:

      while (next_fli_frame(0) == FLI_OK) {
	 if (fli_frame == 345)
	    play_sample(trumpet_sound, 255, 128, 1000, 0);
	 /* Rest some time until next frame... */
      }

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