#include	<windows.h>#include	<mmsystem.h> #include	"u.h"#include	"lib.h"#include	"dat.h"#include	"fns.h"#include	"error.h"#include	"devaudio.h" enum{	Channels = 2,	Rate = 44100,	Bits = 16,}; typedef struct Waveblock Waveblock;struct Waveblock {	WAVEHDR	h;	uchar	s[2048];}; static HWAVEOUT waveout;static Waveblock blk[16];static uint blkidx; voidaudiodevopen(void){	WAVEFORMATEX f; 	memset(&f, 0, sizeof(f));	f.nSamplesPerSec = Rate;	f.wBitsPerSample = Bits;	f.nChannels = Channels;	f.cbSize = 0;	f.wFormatTag = WAVE_FORMAT_PCM;	f.nBlockAlign = (f.wBitsPerSample/8) * f.nChannels;	f.nAvgBytesPerSec = f.nBlockAlign * f.nSamplesPerSec;	if(waveOutOpen(&waveout, WAVE_MAPPER, &f, 0, 0, CALLBACK_NULL) != MMSYSERR_NOERROR)		oserror();} voidaudiodevclose(void){	waveOutClose(waveout);	waveout = 0;} voidaudiodevsetvol(int what, int left, int right){	DWORD v; 	//Windows uses a 0-0xFFFF scale, plan9 uses 0-100	v = right*0xFFFF/100;	v = (v<<16)|(left*0xFFFF/100);	if(waveOutSetVolume(waveout, v) != MMSYSERR_NOERROR)		oserror();} voidaudiodevgetvol(int what, int *left, int *right){	DWORD v; 	if(waveOutGetVolume(waveout, &v) != MMSYSERR_NOERROR)		oserror();	*left = (v&0xFFFF)*100/0xFFFF;	*right = ((v>>16)&0xFFFF)*100/0xFFFF;} intaudiodevwrite(void *v, int n){	Waveblock *b;	int m; 	m = 0;	while(n > sizeof(b->s)){		audiodevwrite(v, sizeof(b->s));		v = (uchar*)v + sizeof(b->s);		n -= sizeof(b->s);		m += sizeof(b->s);	} 	b = &blk[blkidx++ % nelem(blk)];	if(b->h.dwFlags & WHDR_PREPARED){		while(waveOutUnprepareHeader(waveout, &b->h, sizeof(b->h)) == WAVERR_STILLPLAYING)			osmsleep(50);	}	memmove(b->s, v, n);	b->h.lpData = (void*)b->s;	b->h.dwBufferLength = n;	waveOutPrepareHeader(waveout, &b->h, sizeof(b->h));	waveOutWrite(waveout, &b->h, sizeof(b->h)); 	return m + n;} intaudiodevread(void *v, int n){	USED(v);	USED(n); 	error("no reading");	return -1;}