BytesIO类型时，要保证切到初始位置，这样多次读取才能够正常。比如__call__函数。 (#2484)

* BytesIO类型时，要保证切到初始位置，这样多次读取才能够正常。比如__call__函数。
__call__函数的参数audio_file为BytesIO类型时执行到self.preprocess(model, audio_file)会报错，需要判断audio_file为BytesIO类型时执行audio_file.seek(0)。

paddlespeech/cli/asr/infer.py

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import argparse
+import io
 import os
 import sys
 import time
@@ -229,6 +230,8 @@ def preprocess(self, model_type: str, input: Union[str, os.PathLike]):
         audio_file = input
         if isinstance(audio_file, (str, os.PathLike)):
             logger.debug("Preprocess audio_file:" + audio_file)
+        elif isinstance(audio_file, io.BytesIO):
+            audio_file.seek(0)
 
         # Get the object for feature extraction
         if "deepspeech2" in model_type or "conformer" in model_type or "transformer" in model_type:
@@ -352,6 +355,8 @@ def _check(self, audio_file: str, sample_rate: int, force_yes: bool=False):
             if not os.path.isfile(audio_file):
                 logger.error("Please input the right audio file path")
                 return False
+        elif isinstance(audio_file, io.BytesIO):
+            audio_file.seek(0)
 
         logger.debug("checking the audio file format......")
         try: