Re: Audio device mmap and kevents

[Tetsuya Isaki <isaki%pastel-flower.jp@localhost>]

At Tue, 29 Jan 2019 16:06:40 +0900,
Tetsuya Isaki wrote:
> > looks good to me. Can you test recording?
> 
> I will try it. (I need to setup)

I confirmed that GETISPACE at least looks correct with attached
sample code (by watching and calulating it manually :)

And I also confirmed that mplayer+pulseaudio on netbsd-8 worked
even with the patch.  (Although, I'm not sure why pulseaudio
recording operation affects playback, too.)

Anyway, I'll commit GETISPACE part.
Thank you for comments.
---
Tetsuya Isaki <isaki%pastel-flower.jp@localhost / isaki%NetBSD.org@localhost>

#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/audioio.h>
#include <soundcard.h>
#include <unistd.h>

int main(int ac, char *av[])
{
	struct audio_info ai;
	struct audio_buf_info bufinfo;
	int r;

	int afd = open("/dev/audio0", O_RDONLY);
	if (afd == -1)
		err(1, "open audio");

	r = ioctl(afd, AUDIO_GETBUFINFO, &ai);
	if (r == -1)
		err(1, "AUDIO_GETBUFINFO");

	printf("ai.record.buffer_size=%d\n", ai.record.buffer_size);
	printf("ai.blocksize=%d\n", ai.blocksize);
	printf("ai.hiwat=%d\n", ai.hiwat);

	char buf[3000];	// read and discard
	while (1) {
		r = read(afd, buf, sizeof(buf)); 
		printf("read(%d bytes)\n", r);
		if (r != sizeof(buf))
			err(1, "read");

		r = ioctl(afd, AUDIO_GETBUFINFO, &ai);
		if (r == -1)
			err(1, "GETBUFINFO");
		r = ioctl(afd, SNDCTL_DSP_GETISPACE, &bufinfo);
		if (r == -1)
			err(1, "GETISPACE");

		printf("record.seek=%d : ", ai.record.seek);
		printf("fragments=%d fragstotal=%d fragsize=%d bytes=%d\n",
			bufinfo.fragments, bufinfo.fragstotal,
			bufinfo.fragsize, bufinfo.bytes);

		if (bufinfo.bytes < sizeof(buf)) {
			printf("sleep\n");
			sleep(1);
			continue;
		}
	}

	/* NOTREACHED */
	close(afd);
	return 0;
}