Trascrivere il parlato in testo utilizzando la riga di comando

Questa pagina mostra come inviare una richiesta di riconoscimento vocale a Speech-to-Text utilizzando l'interfaccia REST e il comando curl.

Speech-to-Text consente di integrare facilmente le tecnologie di riconoscimento vocale di Google nelle applicazioni degli sviluppatori. Puoi inviare dati audio all'API Speech-to-Text, che restituisce una trascrizione del testo del file audio. Per saperne di più sul servizio, consulta le nozioni di base di Cloud STT.

Prima di iniziare

  1. Accedi al tuo account Google Cloud . Se non conosci Google Cloud, crea un account per valutare le prestazioni dei nostri prodotti in scenari reali. I nuovi clienti ricevono anche 300 $di crediti senza costi per l'esecuzione, il test e il deployment dei workload.

  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 role (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, if any are not already enabled.

    Roles required to enable APIs

    To enable APIs, you need the serviceusage.services.enable permission. If you created the project, then you likely already have this permission through the Owner role (roles/owner). Otherwise, you can get this permission through the Service Usage Admin role (roles/serviceusage.serviceUsageAdmin). 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.

      Go to IAM
    2. Select the project.
    3. Click Grant access.

    4. In the New principals field, enter your user identifier. This is typically the email address for a Google Account.

    5. Click Select a role, then search for the role.
    6. To grant additional roles, click Add another role and add each additional role.
    7. Click Save.

  6. Install the Google Cloud CLI.

  7. If you're using an external identity provider (IdP), you must first sign in to the gcloud CLI with your federated identity.

  8. To initialize the gcloud CLI, run the following command: 

    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 role (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, if any are not already enabled.

    Roles required to enable APIs

    To enable APIs, you need the serviceusage.services.enable permission. If you created the project, then you likely already have this permission through the Owner role (roles/owner). Otherwise, you can get this permission through the Service Usage Admin role (roles/serviceusage.serviceUsageAdmin). 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.

      Go to IAM
    2. Select the project.
    3. Click Grant access.

    4. In the New principals field, enter your user identifier. This is typically the email address for a Google Account.

    5. Click Select a role, then search for the role.
    6. To grant additional roles, click Add another role and add each additional role.
    7. Click Save.

  13. Install the Google Cloud CLI.

  14. If you're using an external identity provider (IdP), you must first sign in to the gcloud CLI with your federated identity.

  15. To initialize the gcloud CLI, run the following command: 

    gcloud init

Esecuzione di una richiesta di trascrizione audio

Utilizza il seguente esempio di codice per inviare una richiesta REST recognize all'API Speech-to-Text.

  1. Esegui questo comando per creare un file JSON come input per la richiesta. Sostituisci /full/path/to/audio/file.wav con il percorso del file audio che vuoi trascrivere:

    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. Utilizza curl per effettuare una richiesta 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

    Dovresti visualizzare una risposta simile alla seguente:

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

Hai inviato la tua prima richiesta a Speech-to-Text.

Esegui la pulizia

Per evitare che al tuo account Google Cloud vengano addebitati costi relativi alle risorse utilizzate in questa pagina, segui questi passaggi.

  1. (Facoltativo) Revoca le credenziali di autenticazione che hai creato ed elimina il file delle credenziali locali. 

    gcloud auth application-default revoke

  2. (Facoltativo) Revoca le credenziali da gcloud CLI. 

    gcloud auth revoke

Console

  • Nella console Google Cloud , vai alla pagina Gestisci risorse.

    Vai a Gestisci risorse

  • Nell'elenco dei progetti, seleziona il progetto che vuoi eliminare, quindi fai clic su Elimina.
  • Nella finestra di dialogo, digita l'ID progetto, quindi fai clic su Chiudi per eliminare il progetto.

    • gcloud

    Elimina un progetto Google Cloud :

    gcloud projects delete PROJECT_ID

    Passaggi successivi