[Server] added asr engine

speechserving/speechserving/conf/application.yaml

@@ -10,6 +10,8 @@ port: 8090
 #                     CONFIG FILE                                #
 ##################################################################
 # add engine type (Options: asr, tts) and config file here.
+
 engine_backend:
     asr: 'conf/asr/asr.yaml'
     tts: 'conf/tts/tts.yaml'
+

speechserving/speechserving/conf/asr/asr.yaml

@@ -1,4 +1,7 @@
 model: 'conformer_wenetspeech'
 lang: 'zh'
 sample_rate: 16000
+cfg_path: 
+ckpt_path: 
 decode_method: 'attention_rescoring'
+force_yes: False

speechserving/speechserving/engine/asr/python/asr_engine.py

@@ -11,29 +11,184 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+import io
+import os
+from typing import List
+from typing import Optional
+from typing import Union
+
+import librosa
+import paddle
+import soundfile
 from engine.base_engine import BaseEngine
 
-from utils.log import logger
+from paddlespeech.cli.asr.infer import ASRExecutor
+from paddlespeech.cli.log import logger
+from paddlespeech.s2t.frontend.featurizer.text_featurizer import TextFeaturizer
+from paddlespeech.s2t.transform.transformation import Transformation
+from paddlespeech.s2t.utils.dynamic_import import dynamic_import
+from paddlespeech.s2t.utils.utility import UpdateConfig
 from utils.config import get_config
 
 __all__ = ['ASREngine']
 
 
+class ASRServerExecutor(ASRExecutor):
+    def __init__(self):
+        super().__init__()
+        pass
+
+    def _check(self, audio_file: str, sample_rate: int, force_yes: bool):
+        self.sample_rate = sample_rate
+        if self.sample_rate != 16000 and self.sample_rate != 8000:
+            logger.error("please input --sr 8000 or --sr 16000")
+            return False
+
+        logger.info("checking the audio file format......")
+        try:
+            audio, audio_sample_rate = soundfile.read(
+                audio_file, dtype="int16", always_2d=True)
+        except Exception as e:
+            logger.exception(e)
+            logger.error(
+                "can not open the audio file, please check the audio file format is 'wav'. \n \
+                 you can try to use sox to change the file format.\n \
+                 For example: \n \
+                 sample rate: 16k \n \
+                 sox input_audio.xx --rate 16k --bits 16 --channels 1 output_audio.wav \n \
+                 sample rate: 8k \n \
+                 sox input_audio.xx --rate 8k --bits 16 --channels 1 output_audio.wav \n \
+                 ")
+
+        logger.info("The sample rate is %d" % audio_sample_rate)
+        if audio_sample_rate != self.sample_rate:
+            logger.warning("The sample rate of the input file is not {}.\n \
+                            The program will resample the wav file to {}.\n \
+                            If the result does not meet your expectations，\n \
+                            Please input the 16k 16 bit 1 channel wav file. \
+                        ".format(self.sample_rate, self.sample_rate))
+            self.change_format = True
+        else:
+            logger.info("The audio file format is right")
+            self.change_format = False
+
+        return True
+
+    def preprocess(self, model_type: str, input: Union[str, os.PathLike]):
+        """
+        Input preprocess and return paddle.Tensor stored in self.input.
+        Input content can be a text(tts), a file(asr, cls) or a streaming(not supported yet).
+        """
+
+        audio_file = input
+
+        # Get the object for feature extraction
+        if "deepspeech2online" in model_type or "deepspeech2offline" in model_type:
+            audio, _ = self.collate_fn_test.process_utterance(
+                audio_file=audio_file, transcript=" ")
+            audio_len = audio.shape[0]
+            audio = paddle.to_tensor(audio, dtype='float32')
+            audio_len = paddle.to_tensor(audio_len)
+            audio = paddle.unsqueeze(audio, axis=0)
+            # vocab_list = collate_fn_test.vocab_list
+            self._inputs["audio"] = audio
+            self._inputs["audio_len"] = audio_len
+            logger.info(f"audio feat shape: {audio.shape}")
+
+        elif "conformer" in model_type or "transformer" in model_type or "wenetspeech" in model_type:
+            logger.info("get the preprocess conf")
+            preprocess_conf = self.config.preprocess_config
+            preprocess_args = {"train": False}
+            preprocessing = Transformation(preprocess_conf)
+            logger.info("read the audio file")
+            audio, audio_sample_rate = soundfile.read(
+                audio_file, dtype="int16", always_2d=True)
+
+            if self.change_format:
+                if audio.shape[1] >= 2:
+                    audio = audio.mean(axis=1, dtype=np.int16)
+                else:
+                    audio = audio[:, 0]
+                # pcm16 -> pcm 32
+                audio = self._pcm16to32(audio)
+                audio = librosa.resample(audio, audio_sample_rate,
+                                         self.sample_rate)
+                audio_sample_rate = self.sample_rate
+                # pcm32 -> pcm 16
+                audio = self._pcm32to16(audio)
+            else:
+                audio = audio[:, 0]
+
+            logger.info(f"audio shape: {audio.shape}")
+            # fbank
+            audio = preprocessing(audio, **preprocess_args)
+
+            audio_len = paddle.to_tensor(audio.shape[0])
+            audio = paddle.to_tensor(audio, dtype='float32').unsqueeze(axis=0)
+
+            self._inputs["audio"] = audio
+            self._inputs["audio_len"] = audio_len
+            logger.info(f"audio feat shape: {audio.shape}")
+
+        else:
+            raise Exception("wrong type")
+
+
 class ASREngine(BaseEngine):
+    """ASR server engine
+
+    Args:
+        metaclass: Defaults to Singleton.
+    """
+
     def __init__(self):
         super(ASREngine, self).__init__()
 
-    def init(self, config_file: str):
-        self.config_file = config_file
-        self.executor = None
+    def init(self, config_file: str) -> bool:
+        """init engine resource
+
+        Args:
+            config_file (str): config file
+
+        Returns:
+            bool: init failed or success
+        """
         self.input = None
         self.output = None
-        config = get_config(self.config_file)
-        pass
+        self.executor = ASRServerExecutor()
 
-    def postprocess(self):
-        pass
+        try:
+            self.config = get_config(config_file)
+            paddle.set_device(paddle.get_device())
+            self.executor._init_from_path(
+                self.config.model, self.config.lang, self.config.sample_rate,
+                self.config.cfg_path, self.config.decode_method,
+                self.config.ckpt_path)
+        except:
+            logger.info("Initialize ASR server engine Failed.")
+            return False
+
+        logger.info("Initialize ASR server engine successfully.")
+        return True
 
-    def run(self):
-        logger.info("start run asr engine")
-        return "hello world"
+    def run(self, audio_data):
+        """engine run 
+
+        Args:
+            audio_data (bytes): base64.b64decode
+        """
+        if self.executor._check(
+                io.BytesIO(audio_data), self.config.sample_rate,
+                self.config.force_yes):
+            logger.info("start run asr engine")
+            self.executor.preprocess(self.config.model, io.BytesIO(audio_data))
+            self.executor.infer(self.config.model)
+            self.output = self.executor.postprocess()  # Retrieve result of asr.
+        else:
+            logger.info("file check failed!")
+            self.output = None
+
+    def postprocess(self):
+        """postprocess
+        """
+        return self.output

speechserving/speechserving/engine/base_engine.py

@@ -18,6 +18,8 @@
 
 from pattern_singleton import Singleton
 
+__all__ = ['BaseEngine']
+
 
 class BaseEngine(metaclass=Singleton):
     """

speechserving/speechserving/engine/engine_factory.py

@@ -11,13 +11,18 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+from typing import Text
+
 from engine.asr.python.asr_engine import ASREngine
 from engine.tts.python.tts_engine import TTSEngine
 
 
+__all__ = ['EngineFactory']
+
+
 class EngineFactory(object):
     @staticmethod
-    def get_engine(engine_name):
+    def get_engine(engine_name: Text):
         if engine_name == 'asr':
             return ASREngine()
         elif engine_name == 'tts':

speechserving/speechserving/main.py

@@ -12,32 +12,40 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import argparse
+
 import uvicorn
 import yaml
+from engine.engine_factory import EngineFactory
 from fastapi import FastAPI
-
 from restful.api import setup_router
-from utils.log import logger
+
 from utils.config import get_config
-from engine.engine_factory import EngineFactory
+from utils.log import logger
 
 app = FastAPI(
     title="PaddleSpeech Serving API", description="Api", version="0.0.1")
 
 
 def init(config):
-    """ system initialization
+    """system initialization
+
+    Args:
+        config (CfgNode): config object
+
+    Returns:
+        bool: 
     """
     # init api
     api_list = list(config.engine_backend)
     api_router = setup_router(api_list)
     app.include_router(api_router)
 
     # init engine
-    engine_list = []
+    engine_pool = []
     for engine in config.engine_backend:
-        engine_list.append(EngineFactory.get_engine(engine_name=engine))
-        engine_list[-1].init(config_file=config.engine_backend[engine])
+        engine_pool.append(EngineFactory.get_engine(engine_name=engine))
+        if not engine_pool[-1].init(config_file=config.engine_backend[engine]):
+            return False
 
     return True
 

speechserving/speechserving/restful/api.py

@@ -12,13 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 from typing import List
+
 from fastapi import APIRouter
 
-from .tts_api import router as tts_router
 from .asr_api import router as asr_router
+from .tts_api import router as tts_router
 
 _router = APIRouter()
 
+
 def setup_router(api_list: List):
 
     for api_name in api_list:
@@ -30,4 +32,3 @@ def setup_router(api_list: List):
             pass
 
     return _router
-