README.md

Cloud Video Intelligence API C++ Client Library

This directory contains an idiomatic C++ client library for the Cloud Video Intelligence API, a service to detect objects, explicit content, and scene changes in videos. It also specifies the region for annotation and transcribes speech to text.

While this library is GA, please note that the Google Cloud C++ client libraries do not follow Semantic Versioning.

Quickstart

The quickstart/ directory contains a minimal environment to get started using this client library in a larger project. The following "Hello World" program is used in this quickstart, and should give you a taste of this library.

For detailed instructions on how to build and install this library, see the top-level README.

#include "google/cloud/videointelligence/v1/video_intelligence_client.h"
#include <google/protobuf/util/time_util.h>
#include <iostream>

int main(int argc, char* argv[]) try {
  auto constexpr kDefaultUri = "gs://cloud-samples-data/video/animals.mp4";
  if (argc > 2) {
    std::cerr << "Usage: " << argv[0] << " [video-uri]\n"
              << "  The gcs-uri must be in gs://... format and must point to a"
              << " MP4 video.\n"
              << "It defaults to " << kDefaultUri << "\n";
    return 1;
  }
  auto uri = std::string{argc == 2 ? argv[1] : kDefaultUri};

  namespace videointelligence = ::google::cloud::videointelligence_v1;
  auto client = videointelligence::VideoIntelligenceServiceClient(
      videointelligence::MakeVideoIntelligenceServiceConnection());

  using google::cloud::videointelligence::v1::Feature;
  google::cloud::videointelligence::v1::AnnotateVideoRequest request;
  request.set_input_uri(uri);
  request.add_features(Feature::SPEECH_TRANSCRIPTION);
  auto& config =
      *request.mutable_video_context()->mutable_speech_transcription_config();
  config.set_language_code("en-US");  // Adjust based
  config.set_max_alternatives(1);  // We will just print the highest-confidence

  auto future = client.AnnotateVideo(request);
  std::cout << "Waiting for response";
  auto const delay = std::chrono::seconds(5);
  while (future.wait_for(delay) == std::future_status::timeout) {
    std::cout << '.' << std::flush;
  }
  std::cout << "DONE\n";

  auto response = future.get();
  if (!response) throw std::move(response).status();

  for (auto const& result : response->annotation_results()) {
    using ::google::protobuf::util::TimeUtil;
    std::cout << "Segment ["
              << TimeUtil::ToString(result.segment().start_time_offset())
              << ", " << TimeUtil::ToString(result.segment().end_time_offset())
              << "]\n";
    for (auto const& transcription : result.speech_transcriptions()) {
      if (transcription.alternatives().empty()) continue;
      std::cout << transcription.alternatives(0).transcript() << "\n";
    }
  }

  return 0;
} catch (google::cloud::Status const& status) {
  std::cerr << "google::cloud::Status thrown: " << status << "\n";
  return 1;
}

More Information

• Official documentation about the Cloud Video Intelligence API service
• Reference doxygen documentation for each release of this client library
• Detailed header comments in our public .h files