GePlaySnd Class Reference

#include <lib_snd.h>

Detailed Description

A class for playing sounds.

Note

Has to be created with Alloc() and destroyed with Free(). Use AutoAlloc to automate the allocation and destruction based on scope.

Normally one want to use the BaseSound class for the actual sound, as in this example:

Filename fn;
if (!fn.FileSelect(FILESELECTTYPE::ANYTHING, FILESELECT::LOAD, "Load Sound"))
  return false;
 
AutoAlloc<BaseSound> sound;
if (!sound) return false;
 
if (!sound->Load(fn)) return false;
 
GeSndInfo sndinfo(sound);
 
AutoAlloc<GePlaySnd> playsound;
if (!playsound) return false;
 
playsound->Open(sound);
playsound->Scrub(0, sndinfo.GetLength().Get());
 
while(playsound->IsPlaying())
{
  GePrint("pos: " + String::FloatToString(playsound->GetPositionEstimate()));
}
 
playsound->Close();

Private Member Functions
	GePlaySnd ()
	~GePlaySnd ()

Alloc/Free
static GePlaySnd *	Alloc ()
static void	Free (GePlaySnd *&data)

Miscellaneous
Bool	Open (const BaseSound *snd)
Bool	Open (Int32 stream_cnt, const BaseSound **streams, const Float *start_offsets, Float max_length)
void	Close ()
void	StartAt (Float64 start)
void	Scrub (Float64 start, Float64 duration)
void	Stop ()
Bool	IsPlaying ()
Float64	GetPositionEstimate ()
void	SetScale (Float64 scale)
Float64	GetScale ()

Constructor & Destructor Documentation

GePlaySnd()

GePlaySnd ( )

private

~GePlaySnd()

~GePlaySnd ( )

private

Member Function Documentation

Alloc()

static GePlaySnd* Alloc ( )

static

Allocates a GePlaySnd instance. Destroy the allocated GePlaySnd instance with Free(). Use AutoAlloc to automate the allocation and destruction based on scope.

Returns

The allocated GePlaySnd instance, or nullptr if the allocation failed.

Free()

static void Free ( GePlaySnd *&  data )

static

Destructs GePlaySnd instances allocated with Alloc(). Use AutoAlloc to automate the allocation and destruction based on scope.

Parameters

[in,out]

data

The GePlaySnd instance to destruct. If the pointer is nullptr nothing happens. The pointer is assigned nullptr afterwards.

Open() [1/2]

Bool Open

(

const BaseSound *

snd

)

The audio data referenced by the BaseSound will be kept in memory until Close() is called.

Parameters

[in]

snd

The sound to use for playback. The caller owns the pointed sound.

Returns

true if successful, otherwise false.

Open() [2/2]

Bool Open	(	Int32	stream_cnt,
		const BaseSound **	streams,
		const Float *	start_offsets,
		Float	max_length
	)

Opens an audio device with multiple BaseSounds that will be mixed. The audio data referenced by the BaseSounds will be kept in memory until Close() is called.

Parameters

[in]	stream_cnt	The number of sounds to be mixed.
[in]	streams	The array with the sounds.
[in]	start_offsets	The array with start time offsets in seconds (this is the audible sound data when StartAt(0) is called).
[in]	max_length	The maximum length of the audio data in seconds (relative to StartAt(0)).

Returns

true if successful, otherwise false.

Close()

void Close

(

)

Closes the audio device.

Note

If the sounds used for Open() have been deleted in the meantime, their audio data will be released.

StartAt()

void StartAt

(

Float64

start

)

Starts audio output.

Parameters

[in]

start

The position relative to the start of the audio data in seconds.

Scrub()

void Scrub	(	Float64	start,
		Float64	duration
	)

Parameters

[in]	start	The position relative to the start of the audio data in seconds.
[in]	duration	The scrub duration in seconds after which the audio device will be stopped.

Stop()

void Stop

(

)

Stops audio output.

IsPlaying()

Bool IsPlaying

(

)

Checks if the audio device is running.

Returns

true if if audio is playing, otherwise false.

GetPositionEstimate()

Float64 GetPositionEstimate

(

)

Gets an estimate audio position.

Returns

The currently audible position in seconds.

SetScale()

void SetScale

(

Float64

scale

)

Sets the playback time scale.

Parameters

[in]

scale

The playback scale value: 1.0 means real time, 2.0 means twice as fast, 0.5 means half the speed, 0.0 is invalid.

GetScale()

Float64 GetScale

(

)

Gets the current playback time scale.

Returns

The playback scale value: 1.0 means real time, 2.0 means twice as fast, 0.5 means half the speed, 0.0 is invalid.