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#include "dsoundout.h"
#include <windows.h>
#include <dsound.h>
struct dsound_state {
IDirectSound8 *ds;
DWORD sectlen;
IDirectSoundBuffer *dsbuf;
HANDLE e_posnotf;
HANDLE t_update;
DWORD terminate;
DWORD currsect;
DWORD playing;
HANDLE mtx_cbproc;
sound_callback cbfunc;
void *userptr;
};
static DWORD WINAPI bufupdatethread(LPVOID p) {
DWORD playcur, writecur;
struct dsound_state *dsound = (struct dsound_state *)p;
while (1) {
WaitForSingleObject(dsound->e_posnotf, INFINITE);
if (dsound->terminate) ExitThread(0);
dsound->dsbuf->lpVtbl->GetCurrentPosition(dsound->dsbuf, &playcur, &writecur);
DWORD playsect = playcur / dsound->sectlen;
if (playsect < dsound->currsect) {
LPVOID ptr;
DWORD len;
DWORD startptr = dsound->currsect * dsound->sectlen;
DWORD writelen = (dsound->sectlen * (4 - dsound->currsect));
dsound->dsbuf->lpVtbl->Lock(dsound->dsbuf, startptr, writelen, &ptr, &len, NULL, NULL, 0);
int16_t *bufptr = (int16_t *)ptr;
if (WaitForSingleObject(dsound->mtx_cbproc, 0) == WAIT_OBJECT_0) {
if (dsound->playing) {
(*dsound->cbfunc)(dsound->userptr, bufptr, writelen/4);
} else {
ZeroMemory(bufptr, writelen);
}
ReleaseMutex(dsound->mtx_cbproc);
} else {
ZeroMemory(bufptr, writelen);
}
dsound->dsbuf->lpVtbl->Unlock(dsound->dsbuf, ptr, writelen, NULL, 0);
dsound->currsect = 0;
} else if (playsect == dsound->currsect) continue;
LPVOID ptr;
DWORD len;
DWORD startptr = dsound->currsect * dsound->sectlen;
uint32_t writelen = (dsound->sectlen * (playsect - dsound->currsect));
dsound->dsbuf->lpVtbl->Lock(dsound->dsbuf, startptr, writelen, &ptr, &len, NULL, NULL, 0);
int16_t *bufptr = (int16_t *)ptr;
if (WaitForSingleObject(dsound->mtx_cbproc, 0) == WAIT_OBJECT_0) {
if (dsound->playing) {
(*dsound->cbfunc)(dsound->userptr, bufptr, writelen/4);
} else {
ZeroMemory(bufptr, writelen);
}
ReleaseMutex(dsound->mtx_cbproc);
} else {
ZeroMemory(bufptr, writelen);
}
dsound->dsbuf->lpVtbl->Unlock(dsound->dsbuf, ptr, writelen, NULL, 0);
dsound->currsect = playsect;
}
}
struct dsound_state *dsound_init(HWND hwnd, unsigned srate, unsigned sectlen,
sound_callback cbfunc, void *userptr) {
HANDLE heap = GetProcessHeap();
struct dsound_state *dsound = HeapAlloc(heap, HEAP_ZERO_MEMORY,
sizeof(struct dsound_state));
if (!dsound) {
MessageBoxW(hwnd, L"cannot allocate memory for DirectSound", L"Error", MB_ICONSTOP);
goto err;
}
CoInitializeEx(0, COINIT_MULTITHREADED);
HRESULT hr;
hr = CoCreateInstance(
&CLSID_DirectSound8,
0,
CLSCTX_INPROC_SERVER,
&IID_IDirectSound8,
(void **)&dsound->ds);
if (hr != S_OK) {
MessageBoxW(hwnd, L"cannot create instance of DirectSound8", L"Error", MB_ICONSTOP);
goto err_dsound;
}
hr = dsound->ds->lpVtbl->Initialize(dsound->ds, 0);
if (hr != S_OK) {
MessageBoxW(hwnd, L"cannot initialize DirectSound8", L"Error", MB_ICONSTOP);
goto err_dsound;
}
dsound->ds->lpVtbl->SetCooperativeLevel(dsound->ds, hwnd, DSSCL_NORMAL);
DSBUFFERDESC bufdesc = {0};
bufdesc.dwSize = sizeof(bufdesc);
bufdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2 |
DSBCAPS_GLOBALFOCUS |
DSBCAPS_CTRLPOSITIONNOTIFY;
bufdesc.dwBufferBytes = sectlen * 4;
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;
bufdesc.lpwfxFormat = &format;
bufdesc.guid3DAlgorithm = DS3DALG_DEFAULT;
bufdesc.dwReserved = 0;
if (dsound->ds->lpVtbl->CreateSoundBuffer(dsound->ds, &bufdesc, &dsound->dsbuf, 0) != S_OK) {
MessageBoxW(hwnd, L"cannot initialize DirectSoundBuffer", L"Error", MB_ICONSTOP);
goto err_ds;
}
IDirectSoundNotify *dsnotf;
if (dsound->dsbuf->lpVtbl->QueryInterface(dsound->dsbuf,
&IID_IDirectSoundNotify,
(void **)&dsnotf) != S_OK) {
goto err_dsbuf;
}
dsound->e_posnotf = CreateEventW(NULL, FALSE, FALSE, L"SNDNOTF");
dsound->t_update = CreateThread(NULL, 0, bufupdatethread, dsound, 0, NULL);
SetThreadPriority(dsound->t_update, THREAD_PRIORITY_HIGHEST);
dsound->sectlen = sectlen;
dsound->playing = 0;
dsound->terminate = 0;
dsound->cbfunc = cbfunc;
dsound->userptr = userptr;
dsound->mtx_cbproc = CreateMutexW(0, FALSE, 0);
DSBPOSITIONNOTIFY posnotf[4] = {
{(DWORD)dsound->sectlen*0, dsound->e_posnotf},
{(DWORD)dsound->sectlen*1, dsound->e_posnotf},
{(DWORD)dsound->sectlen*2, dsound->e_posnotf},
{(DWORD)dsound->sectlen*3, dsound->e_posnotf},
};
dsnotf->lpVtbl->SetNotificationPositions(dsnotf, 4, posnotf);
dsnotf->lpVtbl->Release(dsnotf);
return dsound;
err_dsbuf:
dsound->dsbuf->lpVtbl->Release(dsound->dsbuf);
err_ds:
dsound->ds->lpVtbl->Release(dsound->ds);
err_dsound:
HeapFree(heap, 0, dsound);
err:
return 0;
}
void dsound_pause(struct dsound_state *dsound, int pause) {
if (pause) {
dsound->playing = 0;
WaitForSingleObject(dsound->mtx_cbproc, INFINITE);
ReleaseMutex(dsound->mtx_cbproc);
} else {
dsound->playing = 1;
dsound->dsbuf->lpVtbl->Play(dsound->dsbuf, 0, 0, DSBPLAY_LOOPING);
}
}
void dsound_delete(struct dsound_state *dsound) {
if (!dsound) return;
dsound_pause(dsound, 1);
dsound->terminate = 1;
SetEvent(dsound->e_posnotf);
WaitForSingleObject(dsound->t_update, INFINITE);
CloseHandle(dsound->mtx_cbproc);
dsound->dsbuf->lpVtbl->Release(dsound->dsbuf);
dsound->ds->lpVtbl->Release(dsound->ds);
HeapFree(GetProcessHeap(), 0, dsound);
}
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