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An idiomatic C++ client library for the Cloud Speech-to-Text API, a service which converts audio to text by applying powerful neural network models.
While this library is GA, please note Google Cloud C++ client libraries do not follow Semantic Versioning.
QuickstartThe following shows the code that you'll run in the google/cloud/speech/quickstart/ directory, which should give you a taste of the Cloud Speech-to-Text API C++ client library API.
#include "google/cloud/speech/v1/speech_client.h"
#include "google/cloud/project.h"
#include <iostream>
int main(int argc, char* argv[]) try {
auto constexpr kDefaultUri = "gs://cloud-samples-data/speech/hello.wav";
if (argc > 2) {
std::cerr << "Usage: " << argv[0] << " [gcs-uri]\n"
<< " The gcs-uri must be in gs://... format. It defaults to "
<< kDefaultUri << "\n";
return 1;
}
auto uri = std::string{argc == 2 ? argv[1] : kDefaultUri};
namespace speech = ::google::cloud::speech_v1;
auto client = speech::SpeechClient(speech::MakeSpeechConnection());
google::cloud::speech::v1::RecognitionConfig config;
config.set_language_code("en-US");
google::cloud::speech::v1::RecognitionAudio audio;
audio.set_uri(uri);
auto response = client.Recognize(config, audio);
if (!response) throw std::move(response).status();
std::cout << response->DebugString() << "\n";
return 0;
} catch (google::cloud::Status const& status) {
std::cerr << "google::cloud::Status thrown: " << status << "\n";
return 1;
}
This library offers multiple *Client classes, which are listed below. Each one of these classes exposes all the RPCs for a service as member functions of the class. This library groups multiple services because they are part of the same product or are often used together. A typical example may be the administrative and data plane operations for a single product.
The library also has other classes that provide helpers, configuration parameters, and infrastructure to mock the *Client classes when testing your application.
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-14 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["This webpage provides documentation for the Cloud Speech-to-Text API C++ client library, which facilitates converting audio to text using neural network models."],["The latest release candidate version available is 2.37.0-rc, with multiple previous versions listed, dating back to version 2.11.0, all of which are available for use."],["The Cloud Speech-to-Text API C++ client library offers multiple client classes including `AdaptationClient` and `SpeechClient` for version 1 and version 2, to cover all RPC services."],["The provided quickstart code example demonstrates the basic usage of the library, showing how to set up the configuration and obtain speech-to-text transcription, using a `SpeechClient`."],["The library's error handling, endpoint overrides, authentication credentials, retry policies, and configurable environment variables are also documented for extended understanding and usage."]]],[]]
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