audio_frame_queue: Clean up ff_af_queue_log_state debug function

The function is debug-only, so only compile it in debug mode.
Make it static as it has no uses outside of the file.
Change av_log() to av_dlog().

libavcodec/audio_frame_queue.c

@@ -87,7 +87,7 @@ int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f)
     afq->remaining_samples += f->nb_samples;
 
 #ifdef DEBUG
-    ff_af_queue_log_state(afq);
+    af_queue_log_state(afq);
 #endif
 
     return 0;
@@ -100,7 +100,7 @@ void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts,
     int removed_samples = 0;
 
 #ifdef DEBUG
-    ff_af_queue_log_state(afq);
+    af_queue_log_state(afq);
 #endif
 
     /* get output pts from the next frame or generated pts */
@@ -146,18 +146,18 @@ void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts,
         *duration = ff_samples_to_time_base(afq->avctx, removed_samples);
 }
 
-void ff_af_queue_log_state(AudioFrameQueue *afq)
+#ifdef DEBUG
+static void af_queue_log_state(AudioFrameQueue *afq)
 {
     AudioFrame *f;
-    av_log(afq->avctx, AV_LOG_DEBUG, "remaining delay   = %d\n",
-           afq->remaining_delay);
-    av_log(afq->avctx, AV_LOG_DEBUG, "remaining samples = %d\n",
-           afq->remaining_samples);
-    av_log(afq->avctx, AV_LOG_DEBUG, "frames:\n");
+    av_dlog(afq->avctx, "remaining delay   = %d\n", afq->remaining_delay);
+    av_dlog(afq->avctx, "remaining samples = %d\n", afq->remaining_samples);
+    av_dlog(afq->avctx, "frames:\n");
     f = afq->frame_queue;
     while (f) {
-        av_log(afq->avctx, AV_LOG_DEBUG, "  [ pts=%9"PRId64" duration=%d ]\n",
-               f->pts, f->duration);
+        av_dlog(afq->avctx, "  [ pts=%9"PRId64" duration=%d ]\n",
+                f->pts, f->duration);
         f = f->next;
     }
 }
+#endif /* DEBUG */

libavcodec/audio_frame_queue.h

@@ -80,11 +80,4 @@ int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f);
 void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts,
                         int *duration);
 
-/**
- * Log the current state of the queue.
- *
- * @param afq queue context
- */
-void ff_af_queue_log_state(AudioFrameQueue *afq);
-
 #endif /* AVCODEC_AUDIO_FRAME_QUEUE_H */