diff --git a/port/stm32-f4discovery-usb/port/hal_audio_f4discovery.c b/port/stm32-f4discovery-usb/port/hal_audio_f4discovery.c
index aa0e64143..85ab8f54d 100644
--- a/port/stm32-f4discovery-usb/port/hal_audio_f4discovery.c
+++ b/port/stm32-f4discovery-usb/port/hal_audio_f4discovery.c
@@ -157,6 +157,17 @@ int16_t * hal_audio_sink_get_output_buffer(uint8_t buffer_index){
 	}
 }
 
+/**
+  * @brief  Retrive the audio frequency.
+  * @retval AudioFreq: Audio frequency used to play the audio stream.
+  * @note   This API should be called after the BSP_AUDIO_OUT_Init() to adjust the
+  *         audio frequency.
+  */
+uint32_t hal_audio_sink_get_frequency(void)
+{
+	return sink_sample_rate;
+}
+
 /**
  * @brief Start stream
  */