Tizen Native API  5.5

The TTS API provides functions for synthesizing voice from text and playing synthesized sound data.

Required Header

#include <tts.h>

Overview

You can use Text-To-Speech (TTS) API to read sound data transformed by the engine from input texts. Applications can add input-text to queue for reading continuously and control the player that can play, pause, and stop sound data synthesized from text. To use TTS, follow these steps:
1. Create a handle
2. Register callback functions for notifications
3. Prepare tts-daemon asynchronously
4. Add text to queue for speech
5. Start synthesizing voice from text and play synthesized sound data
6. Pause the player
7. Resume the player
8. Stop the player
9. Destroy a handle
The TTS API also notifies you (by callback mechanism) when the state of TTS is changed, utterance is started and completed, default voice is changed or an error occurred. An application should register callback functions: tts_state_changed_cb(), tts_utterance_started_cb(), tts_utterance_completed_cb(), tts_default_voice_changed_cb(), tts_error_cb(), tts_engine_changed_cb().

State Diagram

The following diagram shows the life cycle and the states of the TTS. This state diagram shows that the state can be changed from 'None' to 'Created' by calling the tts_create() function. Similarly, you can know the relation between the states and API functions. You need to know the current state before calling the API, because the TTS API is based on state machine. The current state can be known from the state changed callback.

capi_uix_tts_state_diagram.png
State diagram

State Transitions

The following table shows previous state and post state of main function. It can be known what precondition is and which synchronous type is. Please check both previous state and post state from the table carefully. In case of tts_prepare() function, state doesn't be changed at once, but asynchronously. From the above state diagram, you can see dotted line as asynchronous api. In this case, the state changed callback is only way to know state transition as ready.

FUNCTION PRE-STATE POST-STATE SYNC TYPE
tts_prepare() Created Ready ASYNC
tts_play() Ready, Paused Playing SYNC
tts_stop() Ready, Playing, Paused Ready SYNC
tts_pause() Playing Paused SYNC

State Dependent Function Calls

The following table shows state-dependent function calls. It is forbidden to call functions listed below in wrong states. Violation of this rule may result in an unpredictable behavior.

FUNCTION VALID STATES DESCRIPTION
tts_create() None All functions must be called after tts_create()
tts_destroy() Created, Ready, Playing, Paused
tts_set_mode() Created The application should set mode to use TTS for screen reader or notification like driving mode.
tts_get_mode() Created
tts_prepare() Created This function works asynchronously. If daemon fork is failed, application gets the error callback.
tts_unprepare() Ready
tts_foreach_supported_voices() Created, Ready, Playing, Paused
tts_get_default_voice() Created, Ready, Playing, Paused
tts_get_state() Created, Ready, Playing, Paused
tts_get_max_text_size() Ready
tts_get_speed_range() Ready
tts_set_credential() Created, Ready
tts_set_private_data()
tts_get_private_data()
Ready
tts_get_error_message() Created, Ready, Recording, Processing This function should be called during TTS error callback.
tts_add_text() Ready, Playing, Paused
tts_play() Ready, Paused
tts_stop() Ready, Playing, Paused
tts_pause() Playing
tts_set_state_changed_cb()
tts_unset_state_changed_cb()
tts_set_utterance_started_cb()
tts_unset_utterance_started_cb()
tts_set_utterance_completed_cb()
tts_unset_utterance_completed_cb()
tts_set_default_voice_changed_cb()
tts_unset_default_voice_changed_cb()
tts_set_error_cb()
tts_unset_error_cb()
tts_set_engine_changed_cb()
tts_unset_engine_changed_cb()
Created All callback function should be registered in Created state

Related Features

This API is related with the following features:

  • http://tizen.org/feature/speech.synthesis
    It is recommended to design feature related codes in your application for reliability.
    You can check if a device supports the related features for this API by using System Information, thereby controlling the procedure of your application.
    To ensure your application is only running on the device with specific features, please define the features in your manifest file using the manifest editor in the SDK.
    More details on featuring your application can be found from Feature Element.

Functions

int tts_create (tts_h *tts)
 Creates a handle for TTS.
int tts_destroy (tts_h tts)
 Destroys the handle and disconnects the daemon.
int tts_set_mode (tts_h tts, tts_mode_e mode)
 Sets the TTS mode.
int tts_get_mode (tts_h tts, tts_mode_e *mode)
 Gets the TTS mode.
int tts_set_credential (tts_h tts, const char *credential)
 Sets the app credential.
int tts_prepare (tts_h tts)
 Connects the daemon asynchronously.
int tts_unprepare (tts_h tts)
 Disconnects the daemon.
int tts_foreach_supported_voices (tts_h tts, tts_supported_voice_cb callback, void *user_data)
 Retrieves all supported voices of the current engine using callback function.
int tts_get_default_voice (tts_h tts, char **language, int *voice_type)
 Gets the default voice set by the user.
int tts_set_private_data (tts_h tts, const char *key, const char *data)
 Sets the private data to tts engine.
int tts_get_private_data (tts_h tts, const char *key, char **data)
 Gets the private data from tts engine.
int tts_get_max_text_size (tts_h tts, unsigned int *size)
 Gets the maximum byte size for text.
int tts_get_state (tts_h tts, tts_state_e *state)
 Gets the current state of TTS.
int tts_get_speed_range (tts_h tts, int *min, int *normal, int *max)
 Gets the speed range.
int tts_get_error_message (tts_h tts, char **err_msg)
 Gets the current error message.
int tts_add_text (tts_h tts, const char *text, const char *language, int voice_type, int speed, int *utt_id)
 Adds a text to the queue.
int tts_play (tts_h tts)
 Starts synthesizing voice from the text and plays the synthesized audio data.
int tts_stop (tts_h tts)
 Stops playing the utterance and clears the queue.
int tts_pause (tts_h tts)
 Pauses the currently playing utterance.
int tts_repeat (tts_h tts, char **text_repeat, int *utt_id)
 Repeats the last played text.
int tts_set_state_changed_cb (tts_h tts, tts_state_changed_cb callback, void *user_data)
 Registers a callback function to be called when the TTS state changes.
int tts_unset_state_changed_cb (tts_h tts)
 Unregisters the callback function.
int tts_set_utterance_started_cb (tts_h tts, tts_utterance_started_cb callback, void *user_data)
 Registers a callback function to detect utterance start.
int tts_unset_utterance_started_cb (tts_h tts)
 Unregisters the callback function.
int tts_set_utterance_completed_cb (tts_h tts, tts_utterance_completed_cb callback, void *user_data)
 Registers a callback function to detect utterance completion.
int tts_unset_utterance_completed_cb (tts_h tts)
 Unregisters the callback function.
int tts_set_error_cb (tts_h tts, tts_error_cb callback, void *user_data)
 Registers a callback function to detect errors.
int tts_unset_error_cb (tts_h tts)
 Unregisters the callback function.
int tts_set_default_voice_changed_cb (tts_h tts, tts_default_voice_changed_cb callback, void *user_data)
 Registers a callback function to detect default voice change.
int tts_unset_default_voice_changed_cb (tts_h tts)
 Unregisters the callback function.
int tts_set_engine_changed_cb (tts_h tts, tts_engine_changed_cb callback, void *user_data)
 Registers a callback function to detect the engine change.
int tts_unset_engine_changed_cb (tts_h tts)
 Unregisters the callback function.

Typedefs

typedef struct tts_s * tts_h
 The TTS handle.
typedef void(* tts_state_changed_cb )(tts_h tts, tts_state_e previous, tts_state_e current, void *user_data)
 Called when the state of TTS is changed.
typedef void(* tts_utterance_started_cb )(tts_h tts, int utt_id, void *user_data)
 Called when utterance has started.
typedef void(* tts_utterance_completed_cb )(tts_h tts, int utt_id, void *user_data)
 Called when utterance is finished.
typedef void(* tts_error_cb )(tts_h tts, int utt_id, tts_error_e reason, void *user_data)
 Called when an error occurs.
typedef bool(* tts_supported_voice_cb )(tts_h tts, const char *language, int voice_type, void *user_data)
 Called to retrieve the supported voice.
typedef void(* tts_default_voice_changed_cb )(tts_h tts, const char *previous_language, int previous_voice_type, const char *current_language, int current_voice_type, void *user_data)
 Called when the default voice is changed.
typedef void(* tts_engine_changed_cb )(tts_h tts, const char *engine_id, const char *language, int voice_type, bool need_credential, void *user_data)
 Called when the engine is changed.

Defines

#define TTS_SPEED_AUTO   0
 Definition for automatic speaking speed.
#define TTS_VOICE_TYPE_AUTO   0
 Definition for automatic voice type.
#define TTS_VOICE_TYPE_MALE   1
 Definition for male voice type.
#define TTS_VOICE_TYPE_FEMALE   2
 Definition for female voice type.
#define TTS_VOICE_TYPE_CHILD   3
 Definition for child voice type.

Define Documentation

#define TTS_SPEED_AUTO   0

Definition for automatic speaking speed.

Since :
2.3
#define TTS_VOICE_TYPE_AUTO   0

Definition for automatic voice type.

Since :
2.3
#define TTS_VOICE_TYPE_CHILD   3

Definition for child voice type.

Since :
2.3
#define TTS_VOICE_TYPE_FEMALE   2

Definition for female voice type.

Since :
2.3
#define TTS_VOICE_TYPE_MALE   1

Definition for male voice type.

Since :
2.3

Typedef Documentation

typedef void(* tts_default_voice_changed_cb)(tts_h tts, const char *previous_language, int previous_voice_type, const char *current_language, int current_voice_type, void *user_data)

Called when the default voice is changed.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
[in]previous_languageThe previous language
[in]previous_voice_typeThe previous voice type
[in]current_languageThe current language
[in]current_voice_typeThe current voice type
[in]user_dataThe user data passed from the callback registration function
See also:
tts_set_default_voice_changed_cb()
typedef void(* tts_engine_changed_cb)(tts_h tts, const char *engine_id, const char *language, int voice_type, bool need_credential, void *user_data)

Called when the engine is changed.

Since :
3.0
Parameters:
[in]ttsThe TTS handle
[in]engine_idEngine ID
[in]languageThe default language specified as an ISO 3166 alpha-2 two letter country-code followed by ISO 639-1 for the two-letter language code (for example, "ko_KR" for Korean, "en_US" for American English)
[in]voice_typeThe default voice type
[in]need_credentialThe necessity of credential
[in]user_dataThe user data passed from the callback registration function
See also:
tts_set_engine_changed_cb()
typedef void(* tts_error_cb)(tts_h tts, int utt_id, tts_error_e reason, void *user_data)

Called when an error occurs.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
[in]utt_idThe utterance ID passed from the add text function
[in]reasonThe error code
[in]user_dataThe user data passed from the callback registration function
Precondition:
An application registers this callback using tts_set_error_cb() to detect error.
See also:
tts_play()
tts_pause()
tts_stop()
tts_set_error_cb()
tts_unset_error_cb()
typedef struct tts_s* tts_h

The TTS handle.

Since :
2.3
typedef void(* tts_state_changed_cb)(tts_h tts, tts_state_e previous, tts_state_e current, void *user_data)

Called when the state of TTS is changed.

Since :
2.3

If the daemon must stop player because of changing engine and the daemon must pause player because of other requests, this callback function is called.

Parameters:
[in]ttsThe TTS handle
[in]previousThe previous state
[in]currentThe current state
[in]user_dataThe user data passed from the callback registration function
Precondition:
An application registers this callback using tts_set_state_changed_cb() to detect changing state.
See also:
tts_set_state_changed_cb()
tts_unset_state_changed_cb()
typedef bool(* tts_supported_voice_cb)(tts_h tts, const char *language, int voice_type, void *user_data)

Called to retrieve the supported voice.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
[in]languageLanguage specified as an ISO 3166 alpha-2 two letter country-code followed by ISO 639-1 for the two-letter language code (for example, "ko_KR" for Korean, "en_US" for American English)
[in]voice_typeA voice type (e.g. TTS_VOICE_TYPE_MALE, TTS_VOICE_TYPE_FEMALE)
[in]user_dataThe user data passed from the foreach function
Returns:
true to continue with the next iteration of the loop, false to break out of the loop
Precondition:
tts_foreach_supported_voices() will invoke this callback function.
See also:
tts_foreach_supported_voices()
typedef void(* tts_utterance_completed_cb)(tts_h tts, int utt_id, void *user_data)

Called when utterance is finished.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
[in]utt_idThe utterance ID passed from the add text function
[in]user_dataThe user data passed from the callback registration function
Precondition:
An application registers this callback using tts_set_utterance_completed_cb() to detect utterance completed.
See also:
tts_add_text()
tts_set_utterance_completed_cb()
tts_unset_utterance_completed_cb()
typedef void(* tts_utterance_started_cb)(tts_h tts, int utt_id, void *user_data)

Called when utterance has started.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
[in]utt_idThe utterance ID passed from the add text function
[in]user_dataThe user data passed from the callback registration function
Precondition:
An application registers this callback using tts_set_utterance_started_cb() to detect utterance started.
See also:
tts_add_text()
tts_set_utterance_started_cb()
tts_unset_utterance_started_cb()

Enumeration Type Documentation

Enumeration for error code.

Since :
2.3
Enumerator:
TTS_ERROR_NONE 

Successful

TTS_ERROR_OUT_OF_MEMORY 

Out of Memory

TTS_ERROR_IO_ERROR 

I/O error

TTS_ERROR_INVALID_PARAMETER 

Invalid parameter

TTS_ERROR_OUT_OF_NETWORK 

Network is down

TTS_ERROR_TIMED_OUT 

No answer from the daemon

TTS_ERROR_PERMISSION_DENIED 

Permission denied

TTS_ERROR_NOT_SUPPORTED 

TTS NOT supported

TTS_ERROR_INVALID_STATE 

Invalid state

TTS_ERROR_INVALID_VOICE 

Invalid voice

TTS_ERROR_ENGINE_NOT_FOUND 

No available engine

TTS_ERROR_OPERATION_FAILED 

Operation failed

TTS_ERROR_AUDIO_POLICY_BLOCKED 

Audio policy blocked

TTS_ERROR_NOT_SUPPORTED_FEATURE 

Not supported feature of current engine (Since 3.0)

TTS_ERROR_SERVICE_RESET 

Service reset (Since 3.0)

enum tts_mode_e

Enumeration for TTS mode.

Since :
2.3
Enumerator:
TTS_MODE_DEFAULT 

Default mode for normal application

TTS_MODE_NOTIFICATION 

Notification mode

TTS_MODE_SCREEN_READER 

Accessibility mode

Enumeration for state.

Since :
2.3
Enumerator:
TTS_STATE_CREATED 

'CREATED' state

TTS_STATE_READY 

'READY' state

TTS_STATE_PLAYING 

'PLAYING' state

TTS_STATE_PAUSED 

'PAUSED' state


Function Documentation

int tts_add_text ( tts_h  tts,
const char *  text,
const char *  language,
int  voice_type,
int  speed,
int *  utt_id 
)

Adds a text to the queue.

Since :
2.3
Remarks:
Locale(e.g. setlocale()) MUST be set for utf8 text validation check.
Parameters:
[in]ttsThe TTS handle
[in]textAn input text based utf8
[in]languageThe language selected from the tts_foreach_supported_voices() (e.g. 'NULL'(Automatic), 'en_US')
[in]voice_typeThe voice type selected from the tts_foreach_supported_voices() (e.g. TTS_VOICE_TYPE_AUTO, TTS_VOICE_TYPE_FEMALE)
[in]speedA speaking speed (e.g. TTS_SPEED_AUTO or the value from tts_get_speed_range())
[out]utt_idThe utterance ID passed to the callback function
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_INVALID_VOICEInvalid voice about language, voice type
TTS_ERROR_OPERATION_FAILEDOperation failure
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
TTS_ERROR_PERMISSION_DENIEDPermission denied
Precondition:
The state should be TTS_STATE_READY, TTS_STATE_PLAYING or TTS_STATE_PAUSED.
See also:
tts_get_max_text_size()
tts_set_credential()
int tts_create ( tts_h tts)

Creates a handle for TTS.

Since :
2.3
Remarks:
If the function succeeds, tts handle must be released with tts_destroy().
Parameters:
[out]ttsThe TTS handle
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_OUT_OF_MEMORYOut of memory
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_ENGINE_NOT_FOUNDEngine not found
TTS_ERROR_OPERATION_FAILEDOperation failure
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Postcondition:
If this function is called, the TTS state will be TTS_STATE_CREATED.
See also:
tts_destroy()
int tts_destroy ( tts_h  tts)

Destroys the handle and disconnects the daemon.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_OPERATION_FAILEDOperation failure
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
See also:
tts_create()
int tts_foreach_supported_voices ( tts_h  tts,
tts_supported_voice_cb  callback,
void *  user_data 
)

Retrieves all supported voices of the current engine using callback function.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
[in]callbackThe callback function to invoke
[in]user_dataThe user data to be passed to the callback function
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_ENGINE_NOT_FOUNDEngine not found
TTS_ERROR_OPERATION_FAILEDOperation failure
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Postcondition:
This function invokes tts_supported_voice_cb() repeatedly for getting voices.
See also:
tts_get_default_voice()
int tts_get_default_voice ( tts_h  tts,
char **  language,
int *  voice_type 
)

Gets the default voice set by the user.

Since :
2.3
Remarks:
If the function succeeds, language must be released with free().
Parameters:
[in]ttsThe TTS handle
[out]languageLanguage specified as an ISO 3166 alpha-2 two letter country-code followed by ISO 639-1 for the two-letter language code (for example, "ko_KR" for Korean, "en_US" for American English)
[out]voice_typeThe voice type
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_ENGINE_NOT_FOUNDEngine not found
TTS_ERROR_OPERATION_FAILEDOperation failure
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
See also:
tts_foreach_supported_voices()
int tts_get_error_message ( tts_h  tts,
char **  err_msg 
)

Gets the current error message.

Since :
3.0
Remarks:
This function should be called from a tts error callback. Calling in any other context will result in an Operation failed error. A successful call will allocate err_msg, which must be released by calling free() when it is no longer required.
Parameters:
[in]ttsThe TTS handle
[out]err_msgThe current error message
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
TTS_ERROR_OPERATION_FAILEDOperation failure
See also:
tts_set_error_cb()
tts_unset_error_cb()
int tts_get_max_text_size ( tts_h  tts,
unsigned int *  size 
)

Gets the maximum byte size for text.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
[out]sizeThe maximum byte size for text
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_READY.
See also:
tts_add_text()
int tts_get_mode ( tts_h  tts,
tts_mode_e mode 
)

Gets the TTS mode.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
[out]modeThe mode
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED.
See also:
tts_set_mode()
int tts_get_private_data ( tts_h  tts,
const char *  key,
char **  data 
)

Gets the private data from tts engine.

The private data is the information provided by the engine. Using this API, the application can get the private data which corresponds to the key from the engine.

Since :
3.0
Remarks:
The data must be released using free() when it is no longer required. If the engine is replaced with the other engine, the key may be ignored.
Parameters:
[in]ttsThe TTS handle
[in]keyThe field name of private data
[out]dataThe data field of private data
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_ENGINE_NOT_FOUNDEngine not found
TTS_ERROR_OPERATION_FAILEDOperation failure
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_READY.
See also:
tts_set_private_data()
int tts_get_speed_range ( tts_h  tts,
int *  min,
int *  normal,
int *  max 
)

Gets the speed range.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
[out]minThe minimum speed value
[out]normalThe normal speed value
[out]maxThe maximum speed value
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_OPERATION_FAILEDOperation failure
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED.
See also:
tts_add_text()
int tts_get_state ( tts_h  tts,
tts_state_e state 
)

Gets the current state of TTS.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
[out]stateThe current state of TTS
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
See also:
tts_play()
tts_stop()
tts_pause()
int tts_pause ( tts_h  tts)

Pauses the currently playing utterance.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_OPERATION_FAILEDOperation failure
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The TTS state should be TTS_STATE_PLAYING.
Postcondition:
If this function succeeds, the TTS state will be TTS_STATE_PAUSED.
See also:
tts_play()
tts_stop()
tts_error_cb()
tts_interrupted_cb()
int tts_play ( tts_h  tts)

Starts synthesizing voice from the text and plays the synthesized audio data.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_OUT_OF_NETWORKOut of network
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_OPERATION_FAILEDOperation failure
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
TTS_ERROR_PERMISSION_DENIEDPermission denied
Precondition:
The current state should be TTS_STATE_READY or TTS_STATE_PAUSED.
Postcondition:
If this function succeeds, the TTS state will be TTS_STATE_PLAYING.
See also:
tts_add_text()
tts_pause()
tts_stop()
tts_utterance_started_cb()
tts_utterance_completed_cb()
tts_error_cb()
tts_set_credential()
int tts_prepare ( tts_h  tts)

Connects the daemon asynchronously.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED.
Postcondition:
If this function is successful, the TTS state will be TTS_STATE_READY. If this function is failed, the error callback is called. (e.g. TTS_ERROR_ENGINE_NOT_FOUND)
See also:
tts_unprepare()
int tts_repeat ( tts_h  tts,
char **  text_repeat,
int *  utt_id 
)

Repeats the last played text.

Since :
5.0
Remarks:
This function repeats the last played text once. If there is no previous text, this function will not work. If the language is changed, the last played text is removed. Before calling this function, please call 'tts_stop()' in order to stop playing the previous one. If this function succeeds, text_repeat must be released with free().
Parameters:
[in]ttsThe TTS handle
[out]text_repeatTexts to be played repeatedly
[out]utt_idThe utterance ID passed to the callback function
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
TTS_ERROR_OPERATION_FAILEDOperation failure
Precondition:
The state should be TTS_STATE_READY.
Postcondition:
If this function succeeds, the TTS state will be TTS_STATE_PLAYING.
See also:
tts_add_text()
tts_stop()
int tts_set_credential ( tts_h  tts,
const char *  credential 
)

Sets the app credential.

Using this API, the application can set a credential. The credential is a key to verify the authorization about using the engine. If the application sets the credential, it will be able to use functions of the engine entirely.

Since :
3.0
Remarks:
The necessity of the credential depends on the engine. In case of the engine which is basically embedded in Tizen, the credential is not necessary so far. However, if the user wants to apply the 3rd party's engine, the credential may be necessary. In that case, please follow the policy provided by the corresponding engine.
Parameters:
[in]ttsThe TTS handle
[in]credentialThe app credential
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccess
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED or TTS_STATE_READY.
See also:
tts_play()
int tts_set_default_voice_changed_cb ( tts_h  tts,
tts_default_voice_changed_cb  callback,
void *  user_data 
)

Registers a callback function to detect default voice change.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
[in]callbackThe callback function to register
[in]user_dataThe user data to be passed to the callback function
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED.
See also:
tts_default_voice_changed_cb()
tts_unset_default_voice_changed_cb()
int tts_set_engine_changed_cb ( tts_h  tts,
tts_engine_changed_cb  callback,
void *  user_data 
)

Registers a callback function to detect the engine change.

Since :
3.0
Parameters:
[in]ttsThe TTS handle
[in]callbackThe callback function to register
[in]user_dataThe user data to be passed to the callback function
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED.
See also:
tts_engine_changed_cb()
tts_unset_engine_changed_cb()
int tts_set_error_cb ( tts_h  tts,
tts_error_cb  callback,
void *  user_data 
)

Registers a callback function to detect errors.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
[in]callbackThe callback function to register
[in]user_dataThe user data to be passed to the callback function
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED.
See also:
tts_error_cb()
tts_unset_error_cb()
int tts_set_mode ( tts_h  tts,
tts_mode_e  mode 
)

Sets the TTS mode.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
[in]modeThe mode
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_OPERATION_FAILEDOperation failure
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED.
See also:
tts_get_mode()
int tts_set_private_data ( tts_h  tts,
const char *  key,
const char *  data 
)

Sets the private data to tts engine.

The private data is the setting parameter for applying keys provided by the engine. Using this API, the application can set the private data and use the corresponding key of the engine. For example, if the engine provides 'girl's voice' as a voice type, the application can set the private data as the following. int ret = tts_set_private_data(tts_h, "voice_type", "GIRL");

Since :
3.0
Remarks:
If the engine is replaced with the other engine, the key may be ignored.
Parameters:
[in]ttsThe TTS handle
[in]keyThe field name of private data
[in]dataThe data for set
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_ENGINE_NOT_FOUNDEngine not found
TTS_ERROR_OPERATION_FAILEDOperation failure
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_READY.
See also:
tts_get_private_data()
int tts_set_state_changed_cb ( tts_h  tts,
tts_state_changed_cb  callback,
void *  user_data 
)

Registers a callback function to be called when the TTS state changes.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
[in]callbackThe callback function to register
[in]user_dataThe user data to be passed to the callback function
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED.
See also:
tts_state_changed_cb()
tts_unset_state_changed_cb()
int tts_set_utterance_completed_cb ( tts_h  tts,
tts_utterance_completed_cb  callback,
void *  user_data 
)

Registers a callback function to detect utterance completion.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
[in]callbackThe callback function to register
[in]user_dataThe user data to be passed to the callback function
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED.
See also:
tts_utterance_completed_cb()
tts_unset_utterance_completed_cb()
int tts_set_utterance_started_cb ( tts_h  tts,
tts_utterance_started_cb  callback,
void *  user_data 
)

Registers a callback function to detect utterance start.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
[in]callbackThe callback function to register
[in]user_dataThe user data to be passed to the callback function
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED.
See also:
tts_utterance_started_cb()
tts_unset_utterance_started_cb()
int tts_stop ( tts_h  tts)

Stops playing the utterance and clears the queue.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_OPERATION_FAILEDOperation failure
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The TTS state should be TTS_STATE_READY or TTS_STATE_PLAYING or TTS_STATE_PAUSED.
Postcondition:
If this function succeeds, the TTS state will be TTS_STATE_READY. This function will remove all text via tts_add_text() and synthesized sound data.
See also:
tts_play()
tts_pause()
int tts_unprepare ( tts_h  tts)

Disconnects the daemon.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_READY.
Postcondition:
If this function is called, the TTS state will be TTS_STATE_CREATED.
See also:
tts_prepare()

Unregisters the callback function.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED.
See also:
tts_set_default_voice_changed_cb()

Unregisters the callback function.

Since :
3.0
Parameters:
[in]ttsThe TTS handle
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED.
See also:
tts_set_engine_changed_cb()
int tts_unset_error_cb ( tts_h  tts)

Unregisters the callback function.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED.
See also:
tts_set_error_cb()

Unregisters the callback function.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED.
See also:
tts_set_state_changed_cb()

Unregisters the callback function.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED.
See also:
tts_set_utterance_completed_cb()

Unregisters the callback function.

Since :
2.3
Parameters:
[in]ttsThe TTS handle
Returns:
0 on success, otherwise a negative error value
Return values:
TTS_ERROR_NONESuccessful
TTS_ERROR_INVALID_PARAMETERInvalid parameter
TTS_ERROR_INVALID_STATEInvalid state
TTS_ERROR_NOT_SUPPORTEDTTS NOT supported
Precondition:
The state should be TTS_STATE_CREATED.
See also:
tts_set_utterance_started_cb()