ofxGoogleTranscriber

Install gRPC

Clone the gRPC repository and follow these instructions to install for C++ (build from source).

Build and Run the Example

You'll want to make sure the provided C++ helloworld runs to verify gRPC and protoc were installed correctly. Build it using these steps (starting at the Build the Example section). The program may compile then segfault when run. This means gRPC and/or Protocol Buffers were not installed properly.

You can follow these steps to try installing again.

Get the gRPC Google APIs

Clone the repo. As cloned, the repository contains Protocol Buffers that describe the API, but no C++ code to actually implement them. You can set the language to C++ via export LANGUAGE=cpp then in the googleapis directory run make all. The C++ code will be placed googleapis/gens/google/, which can be used in an ofxApp.

Adding Them to an Open Frameworks Project

Copy the Source

It's easiest to add the entire google/ directory from gens/ to your XCode project, as there are many inter-dependencies between the api modules. However, you only need some of the included .cc files to be added to your target. In particular, no .cc files in the gens/google/protobuf should be added to the target.

Link the Libraries and Configure Search Paths

Link the following libraries, which should be found in /usr/local/lib:

libgrpc++.dylib libprotobuf.dylib

Make sure /usr/local/lib is in the project's Library Search Paths, as well as /usr/local/include and $(PROJECT_DIR)/google in your Header Search Paths. (These are in the Build Settings tab)

Add Your Google Cloud Credentials

Using these steps from Google:

1. Create a project in the Google Cloud Platform Console. If you haven't already created a project, create one now. Projects enable you to manage all Google Cloud Platform resources for your app, including deployment, access control, billing, and services. 1. Open the Cloud Platform Console. 1. In the drop-down menu at the top, select Create a project. 1. Click Show advanced options. Under App Engine location, select a United States location. 1. Give your project a name. 1. Make a note of the project ID, which might be different from the project name. The project ID is used in commands and in configurations.

1. Enable billing for your project. If you haven't already enabled billing for your project, enable billing now. Enabling billing allows the application to consume billable resources such as Speech API calls. See Cloud Platform Console Help for more information about billing settings.

1. Enable APIs for your project. Click here to visit Cloud Platform Console and enable the Speech API.

1. Download service account credentials. These samples use service accounts for authentication. 1. Visit the Cloud Console, and navigate to: API Manager > Credentials > Create credentials > Service account key 1. Under Service account, select New service account. 1. Under Service account name, enter a service account name of your choosing. For example, transcriber. 1. Under Role, select Project > Service Account Actor. 1. Under Key type, leave JSON selected. 1. Click Create to create a new service account, and download the json credentials file. 1. Set the GOOGLE_APPLICATION_CREDENTIALS environment variable to point to your downloaded service account credentials:

        export GOOGLE_APPLICATION_CREDENTIALS=/path/to/your/credentials-key.json
        

See the Cloud Platform Auth Guide for more information. You can set environment variables in Xcode by modifying your target scheme.