Transcrever uma voz em texto usando a linha de comando

Nesta página, mostramos como enviar uma solicitação de reconhecimento de fala para o Speech-to-Text usando a interface REST e o comando curl.

O Speech-to-Text permite a fácil integração das tecnologias de reconhecimento de fala do Google nos aplicativos do desenvolvedor. Você pode enviar dados de áudio para a API Speech-to-Text e ela retorna uma transcrição em texto do arquivo de áudio. Para saber mais sobre o serviço, consulte Conceitos básicos da Speech-to-Text.

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. Fazer uma solicitação de transcrição de áudio

    Use o exemplo de código a seguir para enviar uma solicitação recognize REST para a API Speech-to-Text.

    1. Execute este comando para criar um arquivo JSON como entrada para a solicitação. Substitua /full/path/to/audio/file.wav pelo caminho para o arquivo de áudio que você quer transcrever:

      echo "{
  \"config\": {
    \"auto_decoding_config\": {},
    \"language_codes\": [\"en-US\"],
    \"model\": \"long\"
  },
  \"content\": \"$(base64 -w 0 /full/path/to/audio/file.wav | sed 's/+/-/g; s/\//_/g')\"
}" > /tmp/data.txt

    2. Use curl para fazer uma solicitação recognize:

      curl -X POST -H "Content-Type: application/json; charset=utf-8" \
    -H "Authorization: Bearer $(gcloud auth print-access-token)" \
    -d @/tmp/data.txt \
    https://speech.googleapis.com/v2/projects/PROJECT_ID/locations/global/recognizers/_:recognize

      Uma resposta semelhante a esta vai aparecer:

        {
    "results": [
      {
        "alternatives": [
          {
            "transcript": "how old is the Brooklyn Bridge",
            "confidence": 0.98267895
          }
        ]
      }
    ]
  }

    Você enviou sua primeira solicitação para o Speech-to-Text.

    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

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

    Go to Manage resources

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

    19. gcloud

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

    Go to Manage resources

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

    22. A seguir