[asterisk-dev] How to create a slinear silent frame?

[Atis Lezdins]

On Mon, May 18, 2009 at 12:36 PM, Holger Wirtz <wirtz at dfn.de> wrote:
> Hi,
>
> I tried to create an empty frame (with data set to 0000000...) but I get
>  crashes when I try to send this frames with ast_write() to a channel.
>
> I created the frame like this:
>
> --- cut here ---
> struct ast_frame* frame_create_silent_voice(int offset,int samples)
> {
>        struct ast_frame* f=NULL;
>        short *data=NULL;
>        int i=0;
>
>        if((f=calloc(1,sizeof(struct ast_frame)))==NULL)
>        {
>                ast_log(LOG_ERROR,"Unable to allocate memory for slinear
> frame\n");
>                return(NULL);
>        }
>
>        f->frametype=AST_FRAME_VOICE;
>        f->subclass=AST_FORMAT_SLINEAR;
>        f->mallocd=AST_MALLOCD_HDR|AST_MALLOCD_DATA;
>        f->samples=samples;
>        f->datalen=samples*sizeof(short);
>        f->offset=offset;
>        f->src=NULL;
>        f->data=NULL;
>
>        if((data=(short *)calloc(1,sizeof(short)*samples)+offset)==NULL)
>        {
>                ast_log(LOG_ERROR,"Unable to create array for frame
> data\n");
>                if(f!=NULL)
>                {
>                        free(f);
>                        f=NULL;
>                }
>        }
>        else
>        {
>                f->data=data;
>        }
>
>        return(f);
> }
> --- cut here ---
>
> What am I doing wrong, can anyone help?
>

While on topic, i'm also interested how to create a beep frame. There
are some frequency generations in indications.c, but i guess i'll need
just a frame :)

Regards,
Atis

-- 
Atis Lezdins,
VoIP Project Manager / Developer,
IQ Labs Inc,
atis at iq-labs.net
Skype: atis.lezdins
Cell Phone: +371 28806004
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