Waveform related types

There are three main types related to waveforms. A waveform is stored in a structure defined as

    typedef 		 struct { 


unsigned long n; 		 /* number of samples 		 */ 


sample_t *s; 		 /* array of samples 		 */ 

} spsig_t;  

where sample_t is a float. To allow for a control of the amount of memory used for I/O functions, I/Os are made using a waveform buffer defined as

    typedef 		 struct { 


unsigned long m; 		 /* maximum number of samples 		 */ 


unsigned long n; 		 /* number of samples 		 */ 


sample_t *s; 		 /* array of samples 		 */ 

} sigbuf_t;  

Finally, waveform I/Os rely on the use of a waveform stream whose corresponding structure is given by

    typedef 		 struct { 


char *name; 		 /* stream file name (NULL if stdin) 		 */ 


void *f; 		 /* input stream (FILE or SP_FILE) 		 */ 


int format; 		 /* stream format 		 */ 


unsigned long nsamples; 		 /* total number of samples in stream 		 */ 


unsigned long nread; 		 /* number of samples read 		 */ 


float Fs; 		 /* sample rate 		 */ 


unsigned short nchannels; 		 /* number of channels 		 */ 


int nbps; 		 /* bytes per    samples and channel 		 */ 


int swap; 		 /* to swap or not to swap? 		 */ 


sigbuf_t *buf; 		 /* input buffer 		 */    

} sigstream_t;