🚀 go-pugleaf

Here's one for "Sun vs. NeXT--A World of difference"

I want to read "continuously" from the sound input, and process
data every 1024 bytes.  Under SunOS, this would involve

	open() /dev/audio
	loop read()ing 1024 bytes

Pretty simple, huh?  Not on the NeXT!  Just the simple act of
reading from the microphone can send the programmer into pages
and pages of complex coding...  and it just DOESN'T WORK.

Here's what I'm doing:

	SNDAcquire() to obtain device and owner ports
	snddriver_stream_setup() to obtain stream port
		dataPath = SNDDRIVER_STREAM_FROM_SNDIN
		sampleCount = 1024
		sampleSize = 1
		lowWater = 48*1024
		highWater = 64*1024
	port_allocate() to obtain reply port
	snddriver_stream_start_reading()
		sampleCount = 3*8192  /* originally 262143*8192 */
		tag = 1
		msg* = TRUE
	snddriver_stream_control()
		control = SNDDRIVER_AWAIT_STREAM
	LOOP {
		msg_receive()
		[print message headers]
		snddriver_reply_handler()
	}

recorded_data() vm_deallocate()s and issues another SNDDRIVER_AWAIT_STREAM

Here's what happens (or doesn't):

- No matter what, I *never* get "completed" messages
- SNDDRIVER_ABORT_STREAM doesn't generate "aborted" messages if
  SNDDRIVER_AWAIT_STREAM has been used--however, after several
  subsequent calls to the recorded_data() handler,
  snddriver_stream_control() fails with error 108
    <nextdev/snd_msgs.h> defines this as SND_SEARCH--couldn't
    find requested resource
  and no further messages arrive
- SNDDRIVER_PAUSE_STREAM does generate a "pause" message, but
  the stream doesn't seem to pause
- changing parameters (e.g. sampleCount) doesn't seem to make
  a difference

I've checked the Tech Docs, NeXTanswers, the FAQ, and the
JeanLaroche materials--none were helpful.

Someone (Greg?) please help!  (I'm using 2.1, if that matters.)

					-=EPS=-