https://social.msdn.microsoft.com/forums/ja-JP/c235c5ec-d8f9-4f6c-ba23-abe0048b1241

IDirectSoundNotify8_Test.cpp

#include "pch.h"
#include "test.h"
#include <objbase.h>
#include <initguid.h>
#include <mmsystem.h>
#include <dsound.h>
#pragma comment(lib, "dsound.lib")

static BOOL ReadWav(void** ppmem, DWORD* psize, WAVEFORMATEX* pformat);

void Test(HWND hwnd)
{
	void* pwav = NULL; //WAVのデータ格納
	DWORD wavsize;//WAVデータの大きさ
	WAVEFORMATEX format;//WAVのフォーマット
	if (!ReadWav(&pwav, &wavsize, &format))//再生させたいWAVデータを取得
	{
		return;
	}

	LPDIRECTSOUNDBUFFER buffer = NULL;
	LPDIRECTSOUNDNOTIFY notify = NULL;
	LPDIRECTSOUND8 pds = NULL;
	DirectSoundCreate8(NULL, &pds, NULL);
	if (pds == NULL)
	{
		goto FINALLY;
	}

	if (pds->SetCooperativeLevel(hwnd, DSSCL_NORMAL) != DS_OK)
	{
		goto FINALLY;
	}

	DSBUFFERDESC desc;//バッファ定義
	memset(&desc, 0, sizeof(desc));
	desc.dwSize = sizeof(desc);
	desc.dwFlags = DSBCAPS_CTRLPOSITIONNOTIFY; //通知を有効にする
	desc.dwBufferBytes = wavsize;
	desc.lpwfxFormat = &format;
	desc.guid3DAlgorithm = GUID_NULL;

	//再生バッファ
	if (pds->CreateSoundBuffer(&desc, &buffer, NULL) != DS_OK)
	{
		goto FINALLY;
	}

	//バッファにWAVを書き込み
	void* pbuff[2];
	DWORD sz[2];
	buffer->SetCurrentPosition(0);
	buffer->Lock(0, wavsize, &pbuff[0], &sz[0], &pbuff[1], &sz[1], DSBLOCK_ENTIREBUFFER);
	memcpy(pbuff[0], pwav, wavsize);
	buffer->Unlock(pbuff[0], sz[0], pbuff[1], sz[1]);


	//通知登録用のインターフェースを取得
	if (buffer->QueryInterface(IID_IDirectSoundNotify8, (LPVOID*)&notify) != S_OK)
	{
		goto FINALLY;
	}

	DSBPOSITIONNOTIFY pos;//通知定義
	memset(&pos, 0, sizeof(pos));
	pos.dwOffset = DSBPN_OFFSETSTOP;//再生が終わったら通知。　// wavsize - 1; //最後(の一瞬前)まで進んだら通知
	pos.hEventNotify = CreateEvent(NULL, TRUE, FALSE, NULL);//通知に使うイベントを用意

	if (notify->SetNotificationPositions(1, &pos) != DS_OK)//通知されるように登録
	{
		goto FINALLY;
	}

	if (buffer->Play(0, 0, 0) != DS_OK)//一回だけ再生
	{
		goto FINALLY;
	}

	while (WaitForSingleObject(pos.hEventNotify, 100) == WAIT_TIMEOUT)
	{//最後まで再生されたらイベントがTrueになるので、それまで待つ
	}

FINALLY:
	if (pos.hEventNotify != 0) { CloseHandle(pos.hEventNotify); }
	if (notify != NULL) { notify->Release(); }
	if (buffer != NULL) { buffer->Release(); }
	if (pds != NULL) { pds->Release(); }
	if (pwav != NULL) { free(pwav); }
}


BOOL ReadWav(void** ppmem, DWORD* psize, WAVEFORMATEX* pformat)
{
	*ppmem = NULL;
	*psize = 0;

	HANDLE hFile = 0;

	hFile = CreateFile(WAVFILEPATH, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
	if (hFile == 0)
	{
		return FALSE;
	}

	DWORD read = 0;
	DWORD sizeH;
	DWORD sizeL;
	sizeL = GetFileSize(hFile, &sizeH);
	if (sizeH)
	{//大きすぎ
		return FALSE;
	}
	if (sizeL == 0)
	{//データなし
		return FALSE;
	}

	void* pmem;
	pmem = malloc(sizeL);

	ReadFile(hFile, pmem, sizeL, &read, NULL);
	CloseHandle(hFile); hFile = NULL;
	if (sizeL != read)
	{
		free(pmem);
		return FALSE;
	}

	*psize = sizeL;
	*ppmem = pmem;

	//面倒なので固定値
	pformat->cbSize = sizeof(WAVEFORMATEX);
	pformat->wFormatTag = WAVE_FORMAT_PCM;
	pformat->nChannels = 2;
	pformat->nSamplesPerSec = 44100;
	pformat->wBitsPerSample = 16;
	pformat->nBlockAlign = (pformat->wBitsPerSample / 8) * pformat->nChannels;
	pformat->nAvgBytesPerSec = pformat->nBlockAlign * pformat->nSamplesPerSec;

	return TRUE;
}

IDirectSoundNotify8_Thread.cpp

#include "pch.h"
#include "test.h"
#include <objbase.h>
#include <initguid.h>
#include <mmsystem.h>
#include <dsound.h>
#pragma comment(lib, "dsound.lib")

typedef struct
{
	HWND hwnd;
	HANDLE waitHandle;
} STEMP;


LPDIRECTSOUNDBUFFER buffer = NULL;
LPDIRECTSOUND8 pds = NULL;

static BOOL ReadWav(void** ppmem, DWORD* psize, WAVEFORMATEX* pformat);
static DWORD WINAPI WaitPlay(void* arg);


void Test(HWND hwnd)
{
	void* pwav = NULL; //WAVのデータ格納
	DWORD wavsize;//WAVデータの大きさ
	WAVEFORMATEX format;//WAVのフォーマット
	if (!ReadWav(&pwav, &wavsize, &format))//再生させたいWAVデータを取得
	{
		return;
	}
	
	LPDIRECTSOUNDNOTIFY notify = NULL;

	DirectSoundCreate8(NULL, &pds, NULL);
	if (pds == NULL)
	{
		goto FINALLY;
	}

	if (pds->SetCooperativeLevel(hwnd, DSSCL_NORMAL) != DS_OK)
	{
		goto FINALLY;
	}

	DSBUFFERDESC desc;//バッファ定義
	memset(&desc, 0, sizeof(desc));
	desc.dwSize = sizeof(desc);
	desc.dwFlags = DSBCAPS_CTRLPOSITIONNOTIFY; //通知を有効にする
	desc.dwBufferBytes = wavsize;
	desc.lpwfxFormat = &format;
	desc.guid3DAlgorithm = GUID_NULL;

	//再生バッファ
	if (pds->CreateSoundBuffer(&desc, &buffer, NULL) != DS_OK)
	{
		goto FINALLY;
	}

	//バッファにWAVを書き込み
	void* pbuff[2];
	DWORD sz[2];
	buffer->SetCurrentPosition(0);
	buffer->Lock(0, wavsize, &pbuff[0], &sz[0], &pbuff[1], &sz[1], DSBLOCK_ENTIREBUFFER);
	memcpy(pbuff[0], pwav, wavsize);
	buffer->Unlock(pbuff[0], sz[0], pbuff[1], sz[1]);


	//通知登録用のインターフェースを取得
	
	if (buffer->QueryInterface(IID_IDirectSoundNotify8, (LPVOID*)&notify) != S_OK)
	{
		goto FINALLY;
	}

	DSBPOSITIONNOTIFY pos;//通知定義
	memset(&pos, 0, sizeof(pos));
	pos.dwOffset = DSBPN_OFFSETSTOP;//再生が終わったら通知。　// wavsize - 1; //最後(の一瞬前)まで進んだら通知
	//pos.dwOffset = wavsize - 1;
	pos.hEventNotify = CreateEvent(NULL, TRUE, FALSE, NULL);//通知に使うイベントを用意

	if (notify->SetNotificationPositions(1, &pos) != DS_OK)//通知されるように登録
	{
		goto FINALLY;
	}


	if (buffer->Play(0, 0, 0) != DS_OK)//一回だけ再生
	{
		goto FINALLY;
	}

	//while (WaitForSingleObject(pos.hEventNotify, 100) == WAIT_TIMEOUT)
	//{//最後まで再生されたらイベントがTrueになるので、それまで待つ
	//}

	//typedef struct
	//{
	//	HWND hwnd;
	//	HANDLE waitHandle;
	//} STEMP;
	STEMP* ptemp;
	ptemp = (STEMP*)malloc(sizeof(STEMP));
	ptemp->hwnd = hwnd;
	ptemp->waitHandle = pos.hEventNotify;

	if (NULL == CreateThread(NULL, 0, WaitPlay, (void*)ptemp, 0, NULL))//スレッドを作る
	{
		CloseHandle(pos.hEventNotify);
		buffer->Release();
		pds->Release();
	}

FINALLY:
	//if (pos.hEventNotify != 0) { CloseHandle(pos.hEventNotify); }
	if (notify != NULL) { notify->Release(); }
	//if (buffer != NULL) { buffer->Release(); }
	//if (pds != NULL) { pds->Release(); }
	if (pwav != NULL) { free(pwav); }
}

DWORD WINAPI WaitPlay(void* arg)
{
	STEMP temp = *(STEMP*)arg;
	free(arg);

	while (WaitForSingleObject(temp.waitHandle, 100) == WAIT_TIMEOUT) //スレッドで待つ
	{//最後まで再生されたらイベントがTrueになるので、それまで待つ
	}

	CloseHandle(temp.waitHandle);

	if (buffer != NULL) { buffer->Release(); }
	if (pds != NULL) { pds->Release(); }

	PostMessage(temp.hwnd, WM_COMMAND, MESSAGE_ID , 0);
	return 0;
}

BOOL ReadWav(void** ppmem, DWORD* psize, WAVEFORMATEX* pformat)
{
	*ppmem = NULL;
	*psize = 0;

	HANDLE hFile = 0;

	hFile = CreateFile(WAVFILEPATH, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
	if (hFile == 0)
	{
		return FALSE;
	}

	DWORD read = 0;
	DWORD sizeH;
	DWORD sizeL;
	sizeL = GetFileSize(hFile, &sizeH);
	if (sizeH)
	{//大きすぎ
		return FALSE;
	}
	if (sizeL == 0)
	{//データなし
		return FALSE;
	}

	void* pmem;
	pmem = malloc(sizeL);

	ReadFile(hFile, pmem, sizeL, &read, NULL);
	CloseHandle(hFile); hFile = NULL;
	if (sizeL != read)
	{
		free(pmem);
		return FALSE;
	}

	*psize = sizeL;
	*ppmem = pmem;

	//面倒なので固定値
	pformat->cbSize = sizeof(WAVEFORMATEX);
	pformat->wFormatTag = WAVE_FORMAT_PCM;
	pformat->nChannels = 2;
	pformat->nSamplesPerSec = 44100;
	pformat->wBitsPerSample = 16;
	pformat->nBlockAlign = (pformat->wBitsPerSample / 8) * pformat->nChannels;
	pformat->nAvgBytesPerSec = pformat->nBlockAlign * pformat->nSamplesPerSec;

	return TRUE;
}