ffplay: fix AudioTrack latency

ijkmediaplayer/jni/ijkplayer/ff_ffplay.c

@@ -1335,10 +1335,11 @@ static void sdl_audio_callback(void *opaque, Uint8 *stream, int len)
         stream += len1;
         is->audio_buf_index += len1;
     }
+    ffp->audio_callback_time = av_gettime();
     bytes_per_sec = is->audio_tgt.freq * is->audio_tgt.channels * av_get_bytes_per_sample(is->audio_tgt.fmt);
     is->audio_write_buf_size = is->audio_buf_size - is->audio_buf_index;
     /* Let's assume the audio driver that is used by SDL has two periods. */
-    is->audio_current_pts = is->audio_clock - (double)(2 * is->audio_hw_buf_size + is->audio_write_buf_size) / bytes_per_sec;
+    is->audio_current_pts = is->audio_clock - (double)(1 * is->audio_hw_buf_size + is->audio_write_buf_size) / bytes_per_sec;
     is->audio_current_pts_drift = is->audio_current_pts - ffp->audio_callback_time / 1000000.0;
     if (is->audioq.serial == is->audio_clock_serial)
         check_external_clock_sync(is, is->audio_current_pts);