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

[Holger Wirtz]

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?

Thanks, Holger
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