使用Google语音时从Google Cloud Storage访问音频文件

Question

我已经使用下面这段代码，使用Google语音成功解析了包含语音和文本的.wav文件。

但是我想访问一个不同的.wav文件，我已经在Google Cloud Storage（公开）上放置了一个不同的.wav文件，而不是在本地硬盘上。为什么不能简单地改变

speech_file = 'my/local/system/sample.wav'

到
speech_file = 'https://console.cloud.google.com/storage/browser/speech_proj_files/sample.wav'

工作可以接受？

这里是我的代码：

speech_file = 'https://console.cloud.google.com/storage/browser/speech_proj_files/sample.wav' 

DISCOVERY_URL = ('https://{api}.googleapis.com/$discovery/rest?' 
       'version={apiVersion}') 


def get_speech_service(): 
    credentials = GoogleCredentials.get_application_default().create_scoped(
     ['https://www.googleapis.com/auth/cloud-platform']) 
    http = htt|plib2.Http() 
    credentials.authorize(http) 

    return discovery.build(
     'speech', 'v1beta1', http=http, discoveryServiceUrl=DISCOVERY_URL) 

def main(speech_file): 
    """Transcribe the given audio file. 

    Args: 
     speech_file: the name of the audio file. 
    """ 
    with open(speech_file, 'rb') as speech: 
     speech_content = base64.b64encode(speech.read()) 

    service = get_speech_service() 
    service_request = service.speech().syncrecognize(
     body={ 
      'config': { 
       'encoding': 'LINEAR16', # raw 16-bit signed LE samples 
       'sampleRate': 44100, # 16 khz 
       'languageCode': 'en-US', # a BCP-47 language tag 
      }, 
      'audio': { 
       'content': speech_content.decode('UTF-8') 
       } 
      }) 
    response = service_request.execute() 
    return response 

Answer 1

我不知道为什么你的做法是行不通的，但我想提供一个快速的建议。

Google Cloud Speech API本身支持Google Cloud Storage对象。而不是下载整个对象只把它上传回云语音的API，只需指定通过交换该线路的对象：

 'audio': { 
      # Remove this: 'content': speech_content.decode('UTF-8') 
      'uri': 'gs://speech_proj_files/sample.wav' # Do this! 
      } 

另外一个建议。您可能会发现Python库更易于使用。试试这个：

from google.cloud import speech 
speech_client = speech.Client() 

audio_sample = speech_client.sample(
    content=None, 
    source_uri='gs://speech_proj_files/sample.wav', 
    encoding='LINEAR16', 
    sample_rate_hertz= 44100) 
results_list = audio_sample.sync_recognize(language_code='en-US') 

这里有一些很好的例子：https://github.com/GoogleCloudPlatform/python-docs-samples/tree/master/speech/cloud-client