[prev in list] [next in list] [prev in thread] [next in thread] 

List:       xaudio-sdk
Subject:    [xaudio-sdk] [xaudio-sdk 3.2.9.5] output filter module modifying buffer (not
From:       kylekey () telocity ! com
Date:       2001-07-23 19:24:56
[Download RAW message or body]

sorry for the repost - forgot subject!

I saw the sample rate conversion output filter in the 
example source code for the filter module. In this 
example the conversion is done in place and the 
contents of the supplied buffer are modified. I 
would like to change the size of that buffer, and or 
create a new one and pass that along the filter chain. 
 
Has anyone ever modified the buffer, not just the 
contents of the buffer, that is being 
pass along.  See code below as an example of  
what I'm trying to do: 
 
static int 
output_filter_write(XA_OutputFilterNode *node,	
		    void		*buffer,  
		    unsigned long	size,  
		    unsigned int  bytes_per_sample, 
		    unsigned int	 channels,  
		    unsigned int	 sample_rate) 
{ 
    short *samples = (short *)buffer; 
    unsigned int i; 
    buffer = realloc(buffer,size*2); 
    return node->next->vtable.output_write(node->next, 
					   buffer, 
					   size*2, 
				   bytes_per_sample, 
					   channels, 
				       sample_rate); 
} 
 
OR  
 
static int 
output_filter_write(XA_OutputFilterNode *node,	
		    void		*buffer,  
		    unsigned long	size,  
		    unsigned int  bytes_per_sample, 
		    unsigned int	 channels,  
		    unsigned int	 sample_rate) 
{ 
    short *samples = calloc(size*2,1); 
    unsigned int i; 
    return node->next->vtable.output_write(node->next, 
					(void*)samples, 
					   size*2, 
				   bytes_per_sample, 
					   channels, 
				       sample_rate); 
} 
 
With either of these, the changes seem to be ignored. 
Thanks in advance. 
Kyle Key 
Bright Eye Solutions, Inc. 

 



_______________________________________________
xaudio-sdk mailing list
xaudio-sdk@mpegtv.com
http://mailman.bok.net/mailman/listinfo/xaudio-sdk

[prev in list] [next in list] [prev in thread] [next in thread]