Tizen Native API  5.5

The Radio APIs provide functions for accessing the radio.

Required Header

#include <radio.h>

Overview

The Radio API provides support for using the Radio. The API allows :

  • Starting and stopping the radio
  • Seeking radio frequency
  • Scanning radio signals
  • Getting the state of the radio

A radio handle (radio_h) is created by calling the radio_create() function and can be started by using the radio_start() function. It provides functions to start (radio_scan_start()) and stop (radio_scan_stop()) radio signal scanning. The radio frequency seek up and seek down can be done asynchronously by calling the radio_seek_up() and radio_seek_down() functions respectively. It also provides functions to get (radio_get_frequency()) and set (radio_set_frequency()) frequency for the given radio handle.

State Diagram

The radio API is controlled by a state machine. The following diagram shows the life cycle and the states of the Radio.

capi_media_radio_state_diagram.png

State Transitions

FUNCTION PRE-STATE POST-STATE SYNC TYPE
radio_create() NONE READY SYNC
radio_destroy() READY NONE SYNC
radio_start() READY PLAYING SYNC
radio_stop() PLAYING READY SYNC
radio_scan_start() READY or PLAYING SCANNING ASYNC
radio_scan_stop() SCANNING READY or PLAYING ASYNC
radio_seek_up() PLAYING PLAYING ASYNC
radio_seek_down() PLAYING PLAYING ASYNC

This API also gives notifications for radio's state change events by a callback mechanism.

Callback(Event) Operations

The callback mechanism is used to notify the application about radio events.

REGISTER UNREGISTER CALLBACK DESCRIPTION
radio_set_scan_completed_cb() radio_unset_scan_completed_cb() radio_scan_completed_cb() This callback is invoked when the scan is completed
radio_set_interrupted_cb() radio_unset_interrupted_cb() radio_interrupted_cb() This callback is used to notify when the radio is interrupted

Related Features

This API is related with the following features:

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 radio_create (radio_h *radio)
 Creates a radio handle.
int radio_destroy (radio_h radio)
 Destroys the radio handle and releases all its resources.
int radio_get_state (radio_h radio, radio_state_e *state)
 Gets the radio's current state.
int radio_start (radio_h radio)
 Starts playing the radio.
int radio_stop (radio_h radio)
 Stops playing the radio.
int radio_seek_up (radio_h radio, radio_seek_completed_cb callback, void *user_data)
 Seeks up the effective frequency of the radio, asynchronously.
int radio_seek_down (radio_h radio, radio_seek_completed_cb callback, void *user_data)
 Seeks down the effective frequency of the radio, asynchronously.
int radio_set_frequency (radio_h radio, int frequency)
 Sets the radio frequency.
int radio_get_frequency (radio_h radio, int *frequency)
 Gets the current frequency of the radio.
int radio_get_signal_strength (radio_h radio, int *strength)
 Gets the current signal strength of the radio.
int radio_scan_start (radio_h radio, radio_scan_updated_cb callback, void *user_data)
 Starts scanning radio signals, asynchronously.
int radio_scan_stop (radio_h radio, radio_scan_stopped_cb callback, void *user_data)
 Stops scanning radio signals, asynchronously.
int radio_set_mute (radio_h radio, bool muted)
 Sets the radio's mute status.
int radio_is_muted (radio_h radio, bool *muted)
 Gets the radio's mute status.
int radio_set_scan_completed_cb (radio_h radio, radio_scan_completed_cb callback, void *user_data)
 Sets a callback function to be invoked when the scan finishes.
int radio_unset_scan_completed_cb (radio_h radio)
 Unsets the scan completed callback function.
int radio_set_interrupted_cb (radio_h radio, radio_interrupted_cb callback, void *user_data)
 Sets a callback function to be invoked when the radio is interrupted.
int radio_unset_interrupted_cb (radio_h radio)
 Unsets the interrupted callback function.
int radio_get_frequency_range (radio_h radio, int *min_freq, int *max_freq)
 Gets the min, max frequency of the region.
int radio_get_channel_spacing (radio_h radio, int *channel_spacing)
 Gets channel spacing.
int radio_set_volume (radio_h radio, float volume)
 Sets the radio's volume.
int radio_get_volume (radio_h radio, float *volume)
 Gets the radio's current volume.

Typedefs

typedef struct radio_s * radio_h
 Radio type handle.
typedef void(* radio_scan_updated_cb )(int frequency, void *user_data)
 Called when the scan information is updated.
typedef void(* radio_scan_stopped_cb )(void *user_data)
 Called when the radio scan is stopped.
typedef void(* radio_scan_completed_cb )(void *user_data)
 Called when the radio scan is completed.
typedef void(* radio_seek_completed_cb )(int frequency, void *user_data)
 Called when the radio seek is completed.
typedef void(* radio_interrupted_cb )(radio_interrupted_code_e code, void *user_data)
 Called when the radio is interrupted.

Typedef Documentation

typedef struct radio_s* radio_h

Radio type handle.

Since :
2.3.1
typedef void(* radio_interrupted_cb)(radio_interrupted_code_e code, void *user_data)

Called when the radio is interrupted.

Since :
2.3.1
Parameters:
[in]codeThe interrupted error code
[in]user_dataThe user data passed from the callback registration function
See also:
radio_set_interrupted_cb()
radio_unset_interrupted_cb()
typedef void(* radio_scan_completed_cb)(void *user_data)

Called when the radio scan is completed.

Since :
2.3.1
Parameters:
[in]user_dataThe user data passed from the callback registration function
Precondition:
It will be invoked when the scan is completed by registering this callback using radio_set_scan_completed_cb().
See also:
radio_scan_start()
radio_set_scan_completed_cb()
radio_unset_scan_completed_cb()
typedef void(* radio_scan_stopped_cb)(void *user_data)

Called when the radio scan is stopped.

Since :
2.3.1
Parameters:
[in]user_dataThe user data passed from the callback registration function
Precondition:
It will be invoked when the scan is stopped by radio_scan_stop().
See also:
radio_scan_stop()
typedef void(* radio_scan_updated_cb)(int frequency, void *user_data)

Called when the scan information is updated.

Since :
2.3.1
Parameters:
[in]frequencyThe tuned radio frequency [87500 ~ 108000] (kHz)
[in]user_dataThe user data passed from the callback registration function
Precondition:
It will be invoked by radio_scan_start().
See also:
radio_scan_start()
typedef void(* radio_seek_completed_cb)(int frequency, void *user_data)

Called when the radio seek is completed.

Since :
2.3.1
Parameters:
[in]frequencyThe current frequency [87500 ~ 108000] (kHz)
[in]user_dataThe user data passed from the callback registration function
Precondition:
It will be invoked when the radio seek is completed by registering this callback using radio_seek_up() or radio_seek_down().
See also:
radio_seek_up()
radio_seek_down()

Enumeration Type Documentation

Enumeration of error codes for the radio.

Since :
2.3.1
Enumerator:
RADIO_ERROR_NONE 

Successful

RADIO_ERROR_OUT_OF_MEMORY 

Out of memory

RADIO_ERROR_INVALID_PARAMETER 

Invalid parameter

RADIO_ERROR_INVALID_OPERATION 

Invalid operation

RADIO_ERROR_INVALID_STATE 

Invalid state

RADIO_ERROR_SOUND_POLICY 

Sound policy error

RADIO_ERROR_NO_ANTENNA 

No Antenna error (Since 3.0)

RADIO_ERROR_PERMISSION_DENIED 

Permission denied

RADIO_ERROR_NOT_SUPPORTED 

Not supported

Enumeration of radio interrupted type.

Since :
2.3.1
Enumerator:
RADIO_INTERRUPTED_BY_RESOURCE_CONFLICT 

Interrupted by a resource conflict

Enumeration of radio state.

Since :
2.3.1
Enumerator:
RADIO_STATE_READY 

Ready to play or scan

RADIO_STATE_PLAYING 

Playing the audio from the tuner

RADIO_STATE_SCANNING 

Scanning/Searching for the next station signal that starts from a given starting frequency


Function Documentation

int radio_create ( radio_h radio)

Creates a radio handle.

Since :
2.3.1
Remarks:
You must release radio using radio_destroy().
Parameters:
[out]radioA new handle to radio
Returns:
0 on success, otherwise a negative error value
Return values:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_OUT_OF_MEMORYOut of memory
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_NOT_SUPPORTEDNot supported
See also:
radio_destroy()
int radio_destroy ( radio_h  radio)

Destroys the radio handle and releases all its resources.

Since :
2.3.1
Remarks:
To completely shutdown the radio operation, call this function with a valid radio handle.
Parameters:
[in]radioThe handle to radio to be destroyed
Returns:
0 on success, otherwise a negative error value
Return values:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_NOT_SUPPORTEDNot supported
See also:
radio_create()
int radio_get_channel_spacing ( radio_h  radio,
int *  channel_spacing 
)

Gets channel spacing.

Since :
3.0
Parameters:
[in]radioThe handle to radio
[out]channel_spacingThe channel spacing value
Returns:
0 on success, otherwise a negative error value
Return values:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_NOT_SUPPORTEDNot supported
int radio_get_frequency ( radio_h  radio,
int *  frequency 
)

Gets the current frequency of the radio.

Since :
2.3.1
Parameters:
[in]radioThe handle to radio
[out]frequencyThe current frequency [87500 ~ 108000] (kHz)
Returns:
0 on success, otherwise a negative error value
Return values:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_NOT_SUPPORTEDNot supported
See also:
radio_set_frequency()
int radio_get_frequency_range ( radio_h  radio,
int *  min_freq,
int *  max_freq 
)

Gets the min, max frequency of the region.

Since :
3.0
Parameters:
[in]radioThe handle to radio
[out]min_freqThe min frequency [87500 ~ 108000] (kHz)
[out]max_freqThe max frequency [87500 ~ 108000] (kHz)
Returns:
0 on success, otherwise a negative error value
Return values:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_NOT_SUPPORTEDNot supported
int radio_get_signal_strength ( radio_h  radio,
int *  strength 
)

Gets the current signal strength of the radio.

Since :
2.3.1
Parameters:
[in]radioThe handle to radio
[out]strengthThe current signal strength [-128 ~ 128] (dBm)
Returns:
0 on success, otherwise a negative error value
Return values:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_NOT_SUPPORTEDNot supported
int radio_get_state ( radio_h  radio,
radio_state_e state 
)

Gets the radio's current state.

Since :
2.3.1
Parameters:
[in]radioThe handle to radio
[out]stateThe current state of the radio
Returns:
0 on success, otherwise a negative error value
Return values:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_NOT_SUPPORTEDNot supported
int radio_get_volume ( radio_h  radio,
float *  volume 
)

Gets the radio's current volume.

The range of volume is from 0 to 1.0, inclusive (1.0 = 100%). This function gets the radio volume, not the system volume. To get the system volume, use the Sound Manager API.

Since :
3.0
Parameters:
[in]radioThe handle to radio
[out]volumeThe current volume [0.0 ~ 1.0](1.0 = 100%)
Returns:
0 on success, otherwise a negative error value
Return values:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_NOT_SUPPORTEDNot supported
See also:
radio_set_volume()
int radio_is_muted ( radio_h  radio,
bool *  muted 
)

Gets the radio's mute status.

If the mute status is true, no sounds are played. If false, sounds are played.

Since :
2.3.1
Parameters:
[in]radioThe handle to radio
[out]mutedThe current mute status: (true = mute, false = not muted)
Returns:
0 on success, otherwise a negative error value
Return values:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_NOT_SUPPORTEDNot supported
See also:
radio_set_mute()
int radio_scan_start ( radio_h  radio,
radio_scan_updated_cb  callback,
void *  user_data 
)

Starts scanning radio signals, asynchronously.

Since :
2.3.1
Parameters:
[in]radioThe handle to radio
[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:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_INVALID_STATEInvalid radio state
RADIO_ERROR_NOT_SUPPORTEDNot supported
Precondition:
The radio state must be set to RADIO_STATE_READY or RADIO_STATE_PLAYING.
Postcondition:
The radio state will be RADIO_STATE_SCANNING during a search. After the scan is completed, the radio state will be set back to the state from before the function call(RADIO_STATE_READY or RADIO_STATE_PLAYING).
It invokes radio_scan_updated_cb() when the scan information updates.
It invokes radio_scan_completed_cb() when the scan completes, if you set a callback with radio_set_scan_completed_cb().
See also:
radio_scan_stop()
radio_set_scan_completed_cb()
radio_scan_completed_cb()
int radio_scan_stop ( radio_h  radio,
radio_scan_stopped_cb  callback,
void *  user_data 
)

Stops scanning radio signals, asynchronously.

Since :
2.3.1
Parameters:
[in]radioThe handle to radio
[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:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid state
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_INVALID_STATEInvalid radio state
RADIO_ERROR_NOT_SUPPORTEDNot supported
Precondition:
The radio state must be set to RADIO_STATE_SCANNING by calling radio_scan_start().
Postcondition:
It invokes radio_scan_stopped_cb() when the scan stops.
After the scan stopped, the radio state will be set back to the state from before the radio_scan_start() function call(RADIO_STATE_READY or RADIO_STATE_PLAYING).
See also:
radio_scan_start()
int radio_seek_down ( radio_h  radio,
radio_seek_completed_cb  callback,
void *  user_data 
)

Seeks down the effective frequency of the radio, asynchronously.

Since :
2.3.1
Parameters:
[in]radioThe handle to radio
[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:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_INVALID_STATEInvalid radio state
RADIO_ERROR_NOT_SUPPORTEDNot supported
Precondition:
The radio state must be set to RADIO_STATE_PLAYING by calling radio_start().
Postcondition:
It invokes radio_seek_completed_cb() when the seek completes.
See also:
radio_seek_up()
int radio_seek_up ( radio_h  radio,
radio_seek_completed_cb  callback,
void *  user_data 
)

Seeks up the effective frequency of the radio, asynchronously.

Since :
2.3.1
Parameters:
[in]radioThe handle to radio
[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:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_INVALID_STATEInvalid radio state
RADIO_ERROR_NOT_SUPPORTEDNot supported
Precondition:
The radio state must be set to RADIO_STATE_PLAYING by calling radio_start().
Postcondition:
It invokes radio_seek_completed_cb() when the seek completes.
See also:
radio_seek_down()
int radio_set_frequency ( radio_h  radio,
int  frequency 
)

Sets the radio frequency.

Since :
2.3.1
Parameters:
[in]radioThe handle to radio
[in]frequencyThe frequency to set [87500 ~ 108000] (kHz)
Returns:
0 on success, otherwise a negative error value
Return values:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_NOT_SUPPORTEDNot supported
See also:
radio_get_frequency()
int radio_set_interrupted_cb ( radio_h  radio,
radio_interrupted_cb  callback,
void *  user_data 
)

Sets a callback function to be invoked when the radio is interrupted.

Since :
2.3.1
Parameters:
[in]radioThe handle to radio
[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:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_NOT_SUPPORTEDNot supported
Postcondition:
radio_interrupted_cb() will be invoked.
See also:
radio_unset_interrupted_cb()
radio_interrupted_code_e
radio_interrupted_cb()
int radio_set_mute ( radio_h  radio,
bool  muted 
)

Sets the radio's mute status.

If the mute status is true, no sounds will be played. If false, sounds will be played. Until this function is called, by default the radio is not muted.

Since :
2.3.1
Parameters:
[in]radioThe handle to radio
[in]mutedThe new mute status: (true = mute, false = not muted)
Returns:
0 on success, otherwise a negative error value
Return values:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_NOT_SUPPORTEDNot supported
See also:
radio_is_muted()
int radio_set_scan_completed_cb ( radio_h  radio,
radio_scan_completed_cb  callback,
void *  user_data 
)

Sets a callback function to be invoked when the scan finishes.

Since :
2.3.1
Parameters:
[in]radioThe handle to radio
[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:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_NOT_SUPPORTEDNot supported
Postcondition:
radio_scan_completed_cb() will be invoked.
See also:
radio_unset_scan_completed_cb()
radio_scan_completed_cb()
int radio_set_volume ( radio_h  radio,
float  volume 
)

Sets the radio's volume.

Setting this volume adjusts the radio's instance volume, not the system volume. The valid range is from 0 to 1.0, inclusive (1.0 = 100%). Default value is 1.0. To change system volume, use the Sound Manager API. Finally, it does not support to set other value into each channel currently.

Since :
3.0
Parameters:
[in]radioThe handle to radio
[in]volumeThe volume to set [0.0 ~ 1.0](1.0 = 100%)
Returns:
0 on success, otherwise a negative error value
Return values:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_NOT_SUPPORTEDNot supported
See also:
radio_get_volume()
int radio_start ( radio_h  radio)

Starts playing the radio.

Since :
2.3.1
Parameters:
[in]radioThe handle to radio
Returns:
0 on success, otherwise a negative error value
Return values:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_STATEInvalid radio state
RADIO_ERROR_SOUND_POLICYSound policy error
RADIO_ERROR_NOT_SUPPORTEDNot supported
RADIO_ERROR_NO_ANTENNANo Antenna error
Precondition:
The radio state must be set to RADIO_STATE_READY by calling radio_create().
Postcondition:
The radio state will be RADIO_STATE_PLAYING.
See also:
radio_stop()
int radio_stop ( radio_h  radio)

Stops playing the radio.

Since :
2.3.1
Parameters:
[in]radioThe handle to radio
Returns:
0 on success, otherwise a negative error value
Return values:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid state
RADIO_ERROR_INVALID_STATEInvalid radio state
RADIO_ERROR_NOT_SUPPORTEDNot supported
Precondition:
The radio state must be set to RADIO_STATE_PLAYING by calling radio_start().
Postcondition:
The radio state will be RADIO_STATE_READY.
See also:
radio_start()
radio_scan_start()

Unsets the interrupted callback function.

Since :
2.3.1
Parameters:
[in]radioThe handle to radio
Returns:
0 on success, otherwise a negative error value
Return values:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_NOT_SUPPORTEDNot supported
See also:
radio_set_interrupted_cb()

Unsets the scan completed callback function.

Since :
2.3.1
Parameters:
[in]radioThe handle to radio
Returns:
0 on success, otherwise a negative error value
Return values:
RADIO_ERROR_NONESuccessful
RADIO_ERROR_INVALID_PARAMETERInvalid parameter
RADIO_ERROR_INVALID_OPERATIONInvalid operation
RADIO_ERROR_NOT_SUPPORTEDNot supported
See also:
radio_set_scan_completed_cb()