creating/deleting MIDI events

creating/deleting MIDI events

[Bernhard Gerlach]

Hello,

Question 1:

How do create a pointer and allocate memory to variables of type 
snd_seq_event to generate events by software? The function 
snd_seq_create_event doesn't exist anymore...


Question 2:

snd_seq_event * event;
snd_seq_event_input( handle, &event );

This allocates memory, but how do I release it? The function 
snd_seq_free_event is marked as deprecated and seems to be empty.

Thanks for answers!

Bernhard


-- 

---------------------------------
Bernhard Gerlach
Fraunhofer AEMT
Am Helmholtzring 1 (Haus M)
98693 Ilmenau
Germany

mail: gerlacbd@emt.iis.fhg.de
---------------------------------



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Re: creating/deleting MIDI events

[Clemens Ladisch]

Bernhard Gerlach wrote:
> How do create a pointer and allocate memory to variables of type
> snd_seq_event to generate events by software? The function
> snd_seq_create_event doesn't exist anymore...

Use a standard pointer, and malloc/calloc/whateveralloc.
You can allocate events directly on the stack (without pointers), too.

> snd_seq_event * event;
> snd_seq_event_input( handle, &event );
>
> This allocates memory, but how do I release it? The function
> snd_seq_free_event is marked as deprecated and seems to be empty.

The event lives in some internal buffer managed by the ALSA library.
Simply don't do anything to free it.

The event buffer may be reused by the next snd_seq_event_input() call.


HTH
Clemens




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Re: creating/deleting MIDI events

[Takashi Iwai]

At Mon, 20 Oct 2003 15:32:29 +0200,
Bernhard Gerlach wrote:
> 
> 
> Hello,
> 
> Question 1:
> 
> How do create a pointer and allocate memory to variables of type 
> snd_seq_event to generate events by software? The function 
> snd_seq_create_event doesn't exist anymore...

simply use malloc.  it's one of few exceptions that the struct is
defined explicitly.


> Question 2:
> 
> snd_seq_event * event;
> snd_seq_event_input( handle, &event );
> 
> This allocates memory, but how do I release it? The function 
> snd_seq_free_event is marked as deprecated and seems to be empty.
 
you don't need to free it since it doesn't allocate the memory but
give the pointer in the buffer in fact.


Takashi


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