ref: 673e3de9a2f59dbac9a845b2f28363b2bb9f0041
dir: /kern/devaudio-win32.c/
#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; void audiodevopen(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(); } void audiodevclose(void) { waveOutClose(waveout); waveout = 0; } void audiodevsetvol(int what, int left, int right) { USED(what); USED(left); USED(right); error("not supported"); } void audiodevgetvol(int what, int *left, int *right) { USED(what); USED(left); USED(right); error("not supported"); } int audiodevwrite(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; } int audiodevread(void *v, int n) { USED(v); USED(n); error("no reading"); return -1; }