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Archived:NSSTTS Utility Symbian API

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Archived.pngArchived: This article is archived because it is not considered relevant for third-party developers creating commercial solutions today. If you think this article is still relevant, let us know by adding the template {{ReviewForRemovalFromArchive|user=~~~~|write your reason here}}.


Article Metadata
Compatibility
Platform(s): S60 3rd Edition, FP2
S60 3rd Edition FP2
Platform Security
Capabilities: ReadUserData
Article
Keywords: CTtsUtility
Created: User:Technical writer 1 (13 Jun 2008)
Updated: User:Technical writer 1 (29 Jan 2010)
Last edited: lpvalente (04 Oct 2012)

Note.pngNote: :This API is not part of the public SDK. It can be found in the SDK API Plug-in.

The CTtsUtility class is the main interface for speech synthesis. The Text-To-Speech (TTS) utility provides methods for opening and playing text files, descriptors, URLs, etc. It also provides methods for adjusting the volume and getting metadata and a list of supported languages, voices, etc.

Contents

Header files

 #include <nssttsutility.h>
 #include <nssttsutilityobserver.h>

Link against

 LIBRARY nssttsutility.lib

Example code

1) Derive your class from MTtsClientUtilityObserver and implement all pure virtual functions.

  void MapcCustomCommandEvent( TInt aEvent, TInt aError );
void MapcInitComplete( TInt aError, const TTimeIntervalMicroSeconds& aDuration );
void MapcPlayComplete( TInt aError );


2) Initialise the TTS utility.

 CTtsUtility* iTtsUtility = CTtsUtility::NewL( *this );


3) Add the style and data to be played.

 if ( iTtsUtility->NumberOfStyles() > 0 )
{
// Delete style if exists
iTtsUtility->DeleteStyle( iStyleId );
}
if ( iParsedText->NumberOfSegments() > 0 )
{
// Remove existing segment from parsed text structure
iParsedText->DeleteSegmentL( 0 );
}
// Use high quality TTS
iStyle.iQuality = ETtsQualityHighOnly;
// Use language and speaker set in Speech application.
// Also speaking rate and volume is set according to Speech app.
iStyle.iLanguage = KTtsUndefinedLanguage;
// Add style
iStyleId = iTtsUtility->AddStyleL( iStyle );
// Initialise with current text and settings.
iTtsUtility->OpenParsedTextL( *iParsedText );
//The command to start playing
iTtsUtility->Play();


3) You can also get and set the volume for CTtsUtility.

 TInt volume;
iTtsUtility->GetVolume( volume );
iTtsUtility->SetVolume( volume );


4) Stop playing the text:

 iTtsUtility->Stop();

Supported languages and voices

The following code sample demonstrates how to retrieve the names of languages and voices supported by the TTS engine.

 #include <ptiengine.h>              // link against ptiengine.lib

CPtiEngine is used for retrieving the name of supported language (for instance, for display purposes).


Implementation

  CPtiEngine* ptiEngine = CPtiEngine::NewL();
CleanupStack::PushL( ptiEngine );
 
RArray<TUid> pluginUids;
CleanupClosePushL( pluginUids );
 
RArray<TLanguage> languages;
CleanupClosePushL( languages );
 
RArray<TTtsStyle> voices;
CleanupClosePushL( voices );
 
// Lists UIDs of available Text-To-Speech plugins
iTtsUtility->ListPluginsL( pluginUids );
 
for ( TInt i = 0; i < pluginUids.Count(); i++ )
{
// pluginUids.operator[]( i ).iUid
// contains the UID of an available TTS plugin (at index i)
 
iTtsUtility->OpenPluginL( pluginUids.operator[]( i ) );
iTtsUtility->GetSupportedLanguagesL( languages );
 
TBuf<64> languageName;
for ( TInt langIdx = 0; langIdx < languages.Count(); ++langIdx )
{
languageName.Zero();
ptiEngine->GetLocalizedLanguageName( languages[langIdx], languageName );
 
// languageName now contains the name of language at index langIdx
 
TRAPD( err, iTtsUtility->GetSupportedVoicesL( languages[langIdx], voices ) );
if ( err == KErrNone )
{
for ( TInt voiceIdx = 0; voiceIdx < voices.Count(); ++voiceIdx )
{
// voices.operator[]( voiceIdx ).iVoice
// contains the name of voice for language at index langIdx
}
}
iTtsUtility->Close();
}
}
CleanupStack::PopAndDestroy(4); // closes the 3 arrays, deletes ptiEngine

See also

Archived:NSSTTS Common Symbian API

This page was last modified on 4 October 2012, at 14:17.
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