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#include "waveout.h"
enum {
HDRCNT = 4
};
struct waveout_state {
struct sound_state soundout;
HWAVEOUT wo;
HANDLE t_update;
HANDLE e_waveout;
HANDLE mtx_cbproc;
DWORD firstout;
DWORD paused;
DWORD terminate;
sound_callback cbfunc;
void *userptr;
WAVEHDR waveheaders[HDRCNT];
DWORD nextout;
int16_t *wavebuf;
};
static DWORD CALLBACK bufupdatethread(void *p) {
struct waveout_state *waveout = (struct waveout_state *)p;
for (;;) {
WaitForSingleObject(waveout->e_waveout, INFINITE);
if (waveout->terminate) ExitThread(0);
int i, whi;
for (i = 0;; i = (i+1)%HDRCNT) {
whi = (i + waveout->nextout) % HDRCNT;
WAVEHDR *wh = &waveout->waveheaders[whi];
if (!(wh->dwFlags & WHDR_DONE)) break;
//wh->dwFlags &= ~WHDR_DONE;
if (WaitForSingleObject(waveout->mtx_cbproc, 0) == WAIT_OBJECT_0) {
if (!waveout->paused) {
waveout->cbfunc(waveout->userptr,
(int16_t *)wh->lpData, wh->dwBufferLength/4);
} else {
ZeroMemory(wh->lpData, wh->dwBufferLength);
}
ReleaseMutex(waveout->mtx_cbproc);
} else {
ZeroMemory(wh->lpData, wh->dwBufferLength);
}
waveOutWrite(waveout->wo, wh, sizeof(*wh));
}
waveout->nextout = whi;
}
}
static void waveout_pause(struct sound_state *state, int pause) {
struct waveout_state *waveout = (struct waveout_state *)state;
if (pause) {
WaitForSingleObject(waveout->mtx_cbproc, INFINITE);
waveout->paused = 1;
ReleaseMutex(waveout->mtx_cbproc);
} else {
if (waveout->firstout) {
WaitForSingleObject(waveout->mtx_cbproc, INFINITE);
waveout->firstout = 0;
waveout->paused = 0;
waveOutReset(waveout->wo);
for (int i = 0; i < HDRCNT; i++) {
WAVEHDR *wh = &waveout->waveheaders[i];
waveout->cbfunc(waveout->userptr,
(int16_t *)wh->lpData, wh->dwBufferLength/4);
waveOutWrite(waveout->wo, wh, sizeof(*wh));
}
ReleaseMutex(waveout->mtx_cbproc);
} else {
waveout->paused = 0;
}
}
}
static void waveout_free(struct sound_state *state) {
struct waveout_state *waveout = (struct waveout_state *)state;
waveout->terminate = 1;
SetEvent(waveout->e_waveout);
WaitForSingleObject(waveout->t_update, INFINITE);
waveOutReset(waveout->wo);
for (int i = 0; i < HDRCNT; i++) {
WAVEHDR *wh = &waveout->waveheaders[i];
waveOutUnprepareHeader(waveout->wo, wh, sizeof(*wh));
}
waveOutClose(waveout->wo);
CloseHandle(waveout->mtx_cbproc);
CloseHandle(waveout->e_waveout);
HANDLE heap = GetProcessHeap();
HeapFree(heap, 0, waveout->wavebuf);
HeapFree(heap, 0, waveout);
}
struct sound_state *waveout_init(HWND hwnd, unsigned srate, unsigned sectlen,
sound_callback cbfunc, void *userptr) {
HANDLE heap = GetProcessHeap();
struct waveout_state *waveout = HeapAlloc(heap, HEAP_ZERO_MEMORY,
sizeof(struct waveout_state));
if (!waveout) {
MessageBoxW(hwnd, L"cannot allocate memory for WaveOut", L"Error", MB_ICONSTOP);
goto err;
}
waveout->e_waveout = CreateEventW(0, FALSE, FALSE, 0);
if (!waveout->e_waveout) {
MessageBoxW(hwnd, L"cannot create event for WaveOut", L"Error", MB_ICONSTOP);
goto err_waveout;
}
waveout->mtx_cbproc = CreateMutexW(0, FALSE, 0);
if (!waveout->mtx_cbproc) {
MessageBoxW(hwnd, L"cannot create mutex for WaveOut", L"Error", MB_ICONSTOP);
goto err_event;
}
waveout->wavebuf = HeapAlloc(heap, HEAP_ZERO_MEMORY, sectlen*HDRCNT);
if (!waveout->wavebuf) {
MessageBoxW(hwnd, L"cannot allocate buffer memory for WaveOut", L"Error", MB_ICONSTOP);
goto err_mtx;
}
WAVEFORMATEX format;
format.wFormatTag = WAVE_FORMAT_PCM;
format.nChannels = 2;
format.nSamplesPerSec = srate;
format.wBitsPerSample = 16;
format.nBlockAlign = format.nChannels * format.wBitsPerSample / 8;
format.nAvgBytesPerSec = format.nSamplesPerSec * format.nBlockAlign;
format.cbSize = 0;
HRESULT hr;
hr = waveOutOpen(&waveout->wo, WAVE_MAPPER, &format,
(DWORD_PTR)waveout->e_waveout, 0, CALLBACK_EVENT);
if (hr != MMSYSERR_NOERROR) {
MessageBoxW(hwnd, L"cannot WaveOutOpen", L"Error", MB_ICONSTOP);
goto err_wavebuf;
}
for (int i = 0; i < HDRCNT; i++) {
WAVEHDR *wh = &waveout->waveheaders[i];
wh->lpData = ((char *)waveout->wavebuf) + sectlen*i;
wh->dwBufferLength = sectlen;
wh->dwFlags = 0;
waveOutPrepareHeader(waveout->wo, wh, sizeof(*wh));
}
waveout->firstout = 1;
waveout->paused = 1;
waveout->terminate = 0;
waveout->cbfunc = cbfunc;
waveout->userptr = userptr;
waveout->t_update = CreateThread(0, 0, bufupdatethread, waveout, 0, 0);
if (!waveout->t_update) {
MessageBoxW(hwnd, L"cannot create thread for Waveout", L"Error", MB_ICONSTOP);
goto err_waveoutopen;
}
SetThreadPriority(waveout->t_update, THREAD_PRIORITY_HIGHEST);
waveout->soundout.pause = waveout_pause;
waveout->soundout.free = waveout_free;
waveout->soundout.apiname = L"WinMM";
return (struct sound_state *)waveout;
err_waveoutopen:
waveOutReset(waveout->wo);
for (int i = 0; i < HDRCNT; i++) {
WAVEHDR *wh = &waveout->waveheaders[i];
waveOutUnprepareHeader(waveout->wo, wh, sizeof(*wh));
}
waveOutClose(waveout->wo);
err_wavebuf:
HeapFree(heap, 0, waveout->wavebuf);
err_mtx:
CloseHandle(waveout->mtx_cbproc);
err_event:
CloseHandle(waveout->e_waveout);
err_waveout:
HeapFree(heap, 0, waveout);
err:
return 0;
}
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