![]() ![]() ![]() Note that unlike other application components, calls on to the IBinder interface returned here may not happen on the main thread of the process. The returned IBinder is usually for a complex interface that has been described using aidl. May return null if clients can not bind to the service. Return the communication channel to the service. Tells the service to synthesize speech from the given text.įrom class įrom interface Notifies the service that it should stop any in-progress speech synthesis.Ībstract void onSynthesizeText(SynthesisRequest request, SynthesisCallback callback) Notifies the engine that it should load a speech synthesis language. Returns the language, country and variant currently being used by the TTS engine.Ībstract int onIsLanguageAvailable(String lang, String country, String variant)Ĭhecks whether the engine supports a given language.Ībstract int onLoadLanguage(String lang, String country, String variant) Queries the service for a set of features supported for a given language. Set onGetFeaturesForLanguage(String lang, String country, String variant) Notifies the engine that it should load a speech synthesis voice. Queries the service for a set of supported voices.Ĭhecks whether the engine supports a voice with a given name. Return a name of the default voice for a given locale. String onGetDefaultVoiceNameFor(String lang, String country, String variant) Return the communication channel to the service.Ĭalled by the system when the service is first created.Ĭalled by the system to notify a Service that it is no longer used and is being removed. The default implementations of Voice-related methods implement them using the pre-existing locale-based implementation.įrom interface 2 If the client uses a voice instead of a locale, SynthesisRequest will contain the requested voice name. Since API level 21 tLanguage(Locale) is implemented by calling tVoice(Voice) with the voice returned by onGetDefaultVoiceNameFor(String, String, String). The last one, onGetDefaultVoiceNameFor(String, String, String) is a link between locale and voice based methods. The first three methods are siblings of the onGetLanguage(), onIsLanguageAvailable(String, String, String) and onLoadLanguage(String, String, String) methods. OnGetDefaultVoiceNameFor(String, String, String) In order to fully take advantage of voices, an engine should implement the following methods: Each one of them can have a different features set. Voices are an abstraction that allow the TTS service to expose multiple backends for a single locale. API Level 20 adds support for Voice objects. onGetLanguage() is not required as of JELLYBEAN_MR2 (API 18) and later, it is only called on earlier versions of Android. Any pending data from the current synthesis will be discarded. onStop() tells the engine that it should stop all ongoing synthesis, if any. Synthesis must be synchronous which means the engine must NOT hold on to the callback or call any methods on it after the method returns. All calls to this method will be on a single thread, which will be different from the main thread of the service. This class and its helpers will then consume that data, which might mean queuing it for playback or writing it to a file or similar. The implementation should synthesize text as per the request parameters and return synthesized data via the supplied callback. OnSynthesizeText(SynthesisRequest, SynthesisCallback) is central to the engine implementation. The first three deal primarily with language management, and are used to query the engine for it's support for a given language and indicate to it that requests in a given language are imminent. OnSynthesizeText(SynthesisRequest, SynthesisCallback) OnIsLanguageAvailable(String, String, String) The following methods need to be implemented: Public abstract class TextToSpeechServiceĪbstract base class for TTS engine implementations. audioEncoding Format of the requested audio stream - can be a choice of.gender The gender of the voice, if available.If not set, then the service will choose a voice based on languageCode and gender. name Name of the voice, see list via gl_talk_languages() or online for supported voices.languageCode The language of the voice as a BCP-47 language tag.output Where to save the speech audio file.The Cloud Text-to-Speech API turns text into sound files of the spoken words. Read more on the Google Cloud Text-to-Speech Website With this easy-to-use API, you can create lifelike interactions with your users, across many applications and devices. ![]() It applies DeepMind’s groundbreaking research in WaveNet and Google’s powerful neural networks to deliver the highest fidelity possible. Google Cloud Text-to-Speech enables developers to synthesize natural-sounding speech with 30 voices, available in multiple languages and variants. Google Cloud Text-to-Speech API Google Cloud Text-to-Speech API Mark Edmondson ![]()
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