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//Written by J. Laroche at the Center for Music Experiment at UCSD, San Diego //California. December 1990.
// A simple example showing how to set-up two streams to and from the DSP.
// This example performs simple sample rate conversion from 22050 to 44100.
// It checks whether the sound is mono or stereo, and signals it to the DSP
// using a host command before sending the data.
#import <sound/sound.h>
#import <sound/sounddriver.h>
#import <mach.h>
#import <stdio.h>
#define Error(A,B) if((A)) {fprintf(stderr,"%s %s\n",B, SNDSoundError((A)));\
mach_error(B,(A)); }
#define DMASIZE 4096
static int done;
static short *read_data;
static int read_count;
static void recorded_data(void *arg, int tag, void *p, int nbytes)
// This gets called when the entire result array has been read from DSP.
{
printf("Conversion done... \n");
read_data = (short *)p;
read_count = nbytes;
done = 1;
}
static void read_started(void *arg, int tag)
// This gets called when the driver starts reading DSP.
{
printf("Starting converting... \n");
}
void main (int argc, char *argv[])
{
static port_t dev_port, owner_port,cmd_port;
static port_t reply_port, read_port, write_port;
int i, protocol;
kern_return_t k_err;
SNDSoundStruct *sound;
SNDSoundStruct *converted;
SNDSoundStruct *dspStruct;
snddriver_handlers_t handlers = { 0, 0,
read_started, 0, 0, 0, 0, 0, recorded_data};
msg_header_t *reply_msg;
int low_water = 48*1024;
int high_water = 64*1024;
short *location,*blank;
int WRITE_TAG = 1;
int READ_TAG = 2;
int length;
int stereo = 0;
if(argc == 1) { printf("I need a 16bit linear sound file...\n");
exit(1);}
k_err = SNDAcquire(SND_ACCESS_OUT|SND_ACCESS_DSP,0,0,0,
NULL_NEGOTIATION_FUN,0,&dev_port,&owner_port);
Error(k_err,"SND acquisition ");
k_err = snddriver_get_dsp_cmd_port(dev_port,owner_port,&cmd_port);
k_err = SNDReadSoundfile(argv[1], &sound);
Error(k_err,argv[1]);
stereo = (sound->channelCount == 2);
printf("Converting a %s sound\n",((stereo)?"stereo":"mono"));
k_err = SNDGetDataPointer(sound,(char**)&location,&length,&i);
Error(k_err,"Data Pointer");
protocol = SNDDRIVER_DSP_PROTO_RAW;
k_err = snddriver_stream_setup(dev_port, owner_port,
SNDDRIVER_STREAM_TO_DSP,
DMASIZE, 2,
low_water, high_water,
&protocol, &write_port);
Error(k_err,"Stream ");
k_err = snddriver_stream_setup(dev_port, owner_port,
SNDDRIVER_STREAM_FROM_DSP,
DMASIZE, 2,
low_water, high_water,
&protocol, &read_port);
Error(k_err,"Stream ");
k_err = snddriver_dsp_protocol(dev_port, owner_port, protocol);
Error(k_err,"Protocol");
k_err = port_allocate(task_self(),&reply_port);
k_err = SNDReadDSPfile("convert22_44.lod", &dspStruct, NULL);
Error(k_err,"DSP file");
k_err = SNDBootDSP(dev_port, owner_port, dspStruct);
Error(k_err,"DSP BOOT");
if(!stereo)
k_err = snddriver_dsp_host_cmd(cmd_port,20,SNDDRIVER_LOW_PRIORITY);
k_err = snddriver_stream_start_writing(write_port,location,
length, WRITE_TAG,0,0,0,0,0,0,0,0, reply_port);
Error(k_err,"Write Command");
vm_allocate(task_self(),(vm_address_t *)(&blank),2*vm_page_size,TRUE);
Error(k_err,"VM Allocation ");
k_err = snddriver_stream_start_writing(write_port,blank,
2*DMASIZE, WRITE_TAG,0,0,0,0,0,0,0,0, reply_port);
Error(k_err,"Write Command");
k_err = snddriver_stream_start_reading(read_port,0,2*length,READ_TAG,
1,0,0,0,0,0, reply_port);
Error(k_err,"Read command");
reply_msg = (msg_header_t *)malloc(MSG_SIZE_MAX);
done = 0;
while (done != 1)
{
reply_msg->msg_size = MSG_SIZE_MAX;
reply_msg->msg_local_port = reply_port;
k_err = msg_receive(reply_msg, MSG_OPTION_NONE, 0);
k_err = snddriver_reply_handler(reply_msg,&handlers);
}
k_err = SNDAlloc(&converted,4*length, sound->dataFormat,SND_RATE_HIGH,
sound->channelCount,4);
Error(k_err,"SND Allocation");
k_err = SNDGetDataPointer(converted,(char**)&location,&i,&i);
Error(k_err,"Data Pointer");
printf("Copying the sound...\n");
for(i=0;i<2*length;i++)
*location++ = *read_data++;
k_err = SNDWriteSoundfile(argv[2], converted);
Error(k_err,"Write Sound");
vm_deallocate(task_self(),(pointer_t)read_data,read_count);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.