Google Cloud Speech API

Google Cloud Speech API Documentation
https://cloud.google.com/speech/docs/

iOS Sample : 

• Instruction : 

# Cloud Speech Streaming gRPC Swift Sample

This app demonstrates how to make streaming gRPC connections to the [Cloud Speech API](https://cloud.google.com/speech/) to recognize speech in recorded audio.

## Prerequisites

- An API key for the Cloud Speech API (See

  [the docs][getting-started] to learn more)

- An OSX machine or emulator

- [Xcode 8 beta 6][xcode] or later

- [Cocoapods][cocoapods] version 1.0 or later

## Quickstart

- Clone this repo and `cd` into this directory.

- Run `./INSTALL`

- In `Speech/SpeechRecognitionService.swift`, replace `YOUR_API_KEY` with the API key obtained above.

- Build and run the app.

## Running the app

- As with all Google Cloud APIs, every call to the Speech API must be associated

  with a project within the [Google Cloud Console][cloud-console] that has the

  Speech API enabled. This is described in more detail in the [getting started

  doc][getting-started], but in brief:

  - Create a project (or use an existing one) in the [Cloud

    Console][cloud-console]

  - [Enable billing][billing] and the [Speech API][enable-speech].

  - Create an [API key][api-key], and save this for later.

- Clone this repository on GitHub. If you have [`git`][git] installed, you can do this by executing the following command:

        $ git clone https://github.com/GoogleCloudPlatform/ios-docs-samples.git

    This will download the repository of samples into the directory

    `ios-docs-samples`.

- `cd` into this directory in the repository you just cloned, and run the command `pod install` to prepare all Cocoapods-related dependencies.

- `open Speech.xcworkspace` to open this project in Xcode. Since we are using Cocoapods, be sure to open the workspace and not Speech.xcodeproj.

- In Xcode's Project Navigator, open the `SpeechRecognitionService.swift` file within the `Speech` directory.

- Find the line where the `API_KEY` is set. Replace the string value with the API key obtained from the Cloud console above. This key is the credential used to authenticate all requests to the Speech API. Calls to the API are thus associated with the project you created above, for access and billing purposes.

- You are now ready to build and run the project. In Xcode you can do this by clicking the 'Play' button in the top left. This will launch the app on the simulator or on the device you've selected. Be sure that the 'Speech' target is selected in the popup near the top left of the Xcode window. 

- Tap the `Start Streaming` button. This uses a custom AudioController class to capture audio in an in-memory instance of NSMutableData. When this data reaches a certain size, it is sent to the SpeechRecognitionService class, which streams it to the speech recognition service. Packets are streamed as instances of the RecognizeRequest object, and the first RecognizeRequest object sent also includes configuration information in an instance of InitialRecognizeRequest. As it runs, the AudioController logs the number of samples and average sample magnitude for each packet that it captures.

- Say a few words and wait for the display to update when your speech is recognized.

- Tap the `Stop Streaming` button to stop capturing audio and close your gRPC connection.

[vision-zip]: https://github.com/GoogleCloudPlatform/cloud-vision/archive/master.zip

[getting-started]: https://cloud.google.com/vision/docs/getting-started

[cloud-console]: https://console.cloud.google.com

[git]: https://git-scm.com/

[xcode]: https://developer.apple.com/xcode/

[billing]: https://console.cloud.google.com/billing?project=_

[enable-speech]: https://console.cloud.google.com/apis/api/speech.googleapis.com/overview?project=_

[api-key]: https://console.cloud.google.com/apis/credentials?project=_

[cocoapods]: https://cocoapods.org/

[gRPC Objective-C setup]: https://github.com/grpc/grpc/tree/master/src/objective-c

• Additional BuildFixes 1 

The Protocol Buffer toolchain and Cocoapods have some problems

that make manual intervention required to build this example.

To fix them perform the following steps:

1) comment out this line:

#import "transformations/GRXMappingWriter.h"

from gRPC-RxLibrary-umbrella.h. You'll see it when

you build and get an error saying "include of non-modular

header inside framework module."

2) replace any of the following failing import statements:

#import "google/cloud/speech/v1/CloudSpeech.pbobjc.h"

#import "google/api/Annotations.pbobjc.h"

#import "google/longrunning/Operations.pbobjc.h"

#import "google/rpc/Status.pbobjc.h"

#import "google/protobuf/Duration.pbobjc.h"

with the corresponding imports:

#import <googleapis/CloudSpeech.pbobjc.h>

#import <googleapis/Annotations.pbobjc.h>

#import <googleapis/Operations.pbobjc.h>

#import <googleapis/Status.pbobjc.h>

#import <googleapis/Duration.pbobjc.h>

• Additional BuildFixes 2

need to change Bundle ID to build on personal device

• fetch the best transcript 

http://www.programfaqs.com/faq/fetch-transcript-values-from-google-speech-api/

• Reference :

https://cloud.google.com/docs/authentication/api-keys

https://github.com/GoogleCloudPlatform/ios-docs-samples/issues/20