Transcrever áudio de uma entrada de streaming

Nesta seção, demonstramos como transcrever áudio de streaming, como a entrada de um microfone, para texto.

O reconhecimento de fala de streaming permite que você faça streaming de áudio para a Speech-to-Text e receba os resultados de um reconhecimento de fala de streaming em tempo real conforme o áudio é processado. Consulte também os limites de áudio para transmissão de solicitações de reconhecimento de fala de streaming. O reconhecimento de fala de streaming só está disponível via gRPC.

Antes de começar

  1. Sign in to your Google Cloud account. If you're new to Google Cloud, create an account to evaluate how our products perform in real-world scenarios. New customers also get $300 in free credits to run, test, and deploy workloads.

  2. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

    Roles required to select or create a project

    • Select a project: Selecting a project doesn't require a specific IAM role—you can select any project that you've been granted a role on.
    • Create a project: To create a project, you need the Project Creator (roles/resourcemanager.projectCreator), which contains the resourcemanager.projects.create permission. Learn how to grant roles.

    Go to project selector

  3. Verify that billing is enabled for your Google Cloud project.

  4. Enable the Speech-to-Text APIs.

    Roles required to enable APIs

    To enable APIs, you need the Service Usage Admin IAM role (roles/serviceusage.serviceUsageAdmin), which contains the serviceusage.services.enable permission. Learn how to grant roles.

    Enable the APIs

  5. Make sure that you have the following role or roles on the project: Cloud Speech Administrator

    Check for the roles

    1. In the Google Cloud console, go to the IAM page.

      Go to IAM
    2. Select the project.

    3. In the Principal column, find all rows that identify you or a group that you're included in. To learn which groups you're included in, contact your administrator.

    4. For all rows that specify or include you, check the Role column to see whether the list of roles includes the required roles.

    Grant the roles

    1. In the Google Cloud console, go to the IAM page.

      Acessar o IAM
    2. Selecione o projeto.
    3. Clique em Conceder acesso.

    4. No campo Novos principais, digite seu identificador de usuário. Normalmente, é o endereço de e-mail de uma Conta do Google.

    5. Na lista Selecionar papel, escolha um.
    6. Para conceder outros papéis, adicione-os clicando em Adicionar outro papel.
    7. Clique em Salvar.

  6. Install the Google Cloud CLI.

  7. Ao usar um provedor de identidade (IdP) externo, primeiro faça login na gcloud CLI com sua identidade federada.

  8. Para inicializar a gcloud CLI, execute o seguinte comando: 

    gcloud init

  9. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

    Roles required to select or create a project

    • Select a project: Selecting a project doesn't require a specific IAM role—you can select any project that you've been granted a role on.
    • Create a project: To create a project, you need the Project Creator (roles/resourcemanager.projectCreator), which contains the resourcemanager.projects.create permission. Learn how to grant roles.

    Go to project selector

  10. Verify that billing is enabled for your Google Cloud project.

  11. Enable the Speech-to-Text APIs.

    Roles required to enable APIs

    To enable APIs, you need the Service Usage Admin IAM role (roles/serviceusage.serviceUsageAdmin), which contains the serviceusage.services.enable permission. Learn how to grant roles.

    Enable the APIs

  12. Make sure that you have the following role or roles on the project: Cloud Speech Administrator

    Check for the roles

    1. In the Google Cloud console, go to the IAM page.

      Go to IAM
    2. Select the project.

    3. In the Principal column, find all rows that identify you or a group that you're included in. To learn which groups you're included in, contact your administrator.

    4. For all rows that specify or include you, check the Role column to see whether the list of roles includes the required roles.

    Grant the roles

    1. In the Google Cloud console, go to the IAM page.

      Acessar o IAM
    2. Selecione o projeto.
    3. Clique em Conceder acesso.

    4. No campo Novos principais, digite seu identificador de usuário. Normalmente, é o endereço de e-mail de uma Conta do Google.

    5. Na lista Selecionar papel, escolha um.
    6. Para conceder outros papéis, adicione-os clicando em Adicionar outro papel.
    7. Clique em Salvar.

  13. Install the Google Cloud CLI.

  14. Ao usar um provedor de identidade (IdP) externo, primeiro faça login na gcloud CLI com sua identidade federada.

  15. Para inicializar a gcloud CLI, execute o seguinte comando: 

    gcloud init

    16. As bibliotecas de cliente podem usar o Application Default Credentials para se autenticar facilmente nas APIs do Google e enviar solicitações para elas. Com o Application Default Credentials, é possível testar seu aplicativo localmente e implantá-lo sem alterar o código. Para mais informações, consulte Autenticação para usar bibliotecas de cliente.

  16. If you're using a local shell, then create local authentication credentials for your user account: 

    gcloud auth application-default login

    You don't need to do this if you're using Cloud Shell.

    If an authentication error is returned, and you are using an external identity provider (IdP), confirm that you have signed in to the gcloud CLI with your federated identity.

    17. Verifique também se você instalou a biblioteca de cliente.

    Realizar o reconhecimento de fala com streaming em um arquivo local

    Este é um exemplo de reconhecimento de fala de streaming em um arquivo de áudio local: Há um limite de 25 KB de áudio enviado nas solicitações de um stream. Esse limite se aplica à solicitação StreamingRecognize inicial e ao tamanho de cada mensagem individual no stream. Exceder esse limite causará um erro.

    Python

    import os

from google.cloud.speech_v2 import SpeechClient
from google.cloud.speech_v2.types import cloud_speech as cloud_speech_types

PROJECT_ID = os.getenv("GOOGLE_CLOUD_PROJECT")

def transcribe_streaming_v2(
    stream_file: str,
) -> cloud_speech_types.StreamingRecognizeResponse:
    """Transcribes audio from an audio file stream using Google Cloud Speech-to-Text API.
    Args:
        stream_file (str): Path to the local audio file to be transcribed.
            Example: "resources/audio.wav"
    Returns:
        list[cloud_speech_types.StreamingRecognizeResponse]: A list of objects.
            Each response includes the transcription results for the corresponding audio segment.
    """
    # Instantiates a client
    client = SpeechClient()

    # Reads a file as bytes
    with open(stream_file, "rb") as f:
        audio_content = f.read()

    # In practice, stream should be a generator yielding chunks of audio data
    chunk_length = len(audio_content) // 5
    stream = [
        audio_content[start : start + chunk_length]
        for start in range(0, len(audio_content), chunk_length)
    ]
    audio_requests = (
        cloud_speech_types.StreamingRecognizeRequest(audio=audio) for audio in stream
    )

    recognition_config = cloud_speech_types.RecognitionConfig(
        auto_decoding_config=cloud_speech_types.AutoDetectDecodingConfig(),
        language_codes=["en-US"],
        model="chirp_3",
    )
    streaming_config = cloud_speech_types.StreamingRecognitionConfig(
        config=recognition_config
    )
    config_request = cloud_speech_types.StreamingRecognizeRequest(
        recognizer=f"projects/{PROJECT_ID}/locations/global/recognizers/_",
        streaming_config=streaming_config,
    )

    def requests(config: cloud_speech_types.RecognitionConfig, audio: list) -> list:
        yield config
        yield from audio

    # Transcribes the audio into text
    responses_iterator = client.streaming_recognize(
        requests=requests(config_request, audio_requests)
    )
    responses = []
    for response in responses_iterator:
        responses.append(response)
        for result in response.results:
            print(f"Transcript: {result.alternatives[0].transcript}")

    return responses

    É possível fazer streaming de um arquivo de áudio local para a API Speech-to-Text, mas é recomendável que você execute o reconhecimento de áudio síncrono.

    Limpeza

    Para evitar cobranças na conta do Google Cloud pelos recursos usados nesta página, siga as etapas abaixo.

    1. Optional: Revoke the authentication credentials that you created, and delete the local credential file. 

      gcloud auth application-default revoke

    2. Optional: Revoke credentials from the gcloud CLI. 

      gcloud auth revoke

    Console

  17. In the Google Cloud console, go to the Manage resources page.

    Go to Manage resources

  18. In the project list, select the project that you want to delete, and then click Delete.
  19. In the dialog, type the project ID, and then click Shut down to delete the project.

    20. gcloud

  20. In the Google Cloud console, go to the Manage resources page.

    Go to Manage resources

  21. In the project list, select the project that you want to delete, and then click Delete.
  22. In the dialog, type the project ID, and then click Shut down to delete the project.

    23. A seguir