C++ IDirectSoundBuffer_Lock函数代码示例

static void DS_Update(void)
{
	LPVOID block;
	DWORD bBytes;

	/* Do first update in DS_Update() to be consistent with other
	   non threaded drivers. */
	if (do_update && pSoundBuffer) {
		do_update = 0;

		if (IDirectSoundBuffer_Lock(pSoundBuffer, 0, fragsize, &block, &bBytes, NULL, NULL, 0)
											== DSERR_BUFFERLOST) {
			IDirectSoundBuffer_Restore (pSoundBuffer);
			IDirectSoundBuffer_Lock (pSoundBuffer, 0, fragsize, &block, &bBytes, NULL, NULL, 0);
		}

		if (Player_Paused_internal()) {
			VC_SilenceBytes ((SBYTE *)block, (ULONG)bBytes);
		} else {
			VC_WriteBytes ((SBYTE *)block, (ULONG)bBytes);
		}

		IDirectSoundBuffer_Unlock (pSoundBuffer, block, bBytes, NULL, 0);

		IDirectSoundBuffer_SetCurrentPosition(pSoundBuffer, 0);
		IDirectSoundBuffer_Play(pSoundBuffer, 0, 0, DSBPLAY_LOOPING);

		threadInUse=1;
		ResumeThread (updateBufferHandle);
	}
}

static BOOL AppWriteDataToBuffer(LPDIRECTSOUNDBUFFER lpDsb,  // The buffer.
				 DWORD dwOffset,	      // Our own write cursor.
				 LPBYTE lpbSoundData,	      // Start of our data.
				 DWORD dwSoundBytes)	      // Size of block to copy.
{ 
    LPVOID  lpvPtr1; 
    DWORD dwBytes1; 
    LPVOID  lpvPtr2; 
    DWORD dwBytes2; 
    HRESULT hr; 
    
    // Obtain memory address of write block. This will be in two parts
    // if the block wraps around.
    
    hr = IDirectSoundBuffer_Lock( lpDsb, dwOffset, dwSoundBytes, &lpvPtr1, 
				  &dwBytes1, &lpvPtr2, &dwBytes2, 0); 
    
    // If the buffer was lost, restore and retry lock. 
    if (DSERR_BUFFERLOST == hr) { 
	IDirectSoundBuffer_Restore(lpDsb); 
	hr = IDirectSoundBuffer_Lock( lpDsb, dwOffset, dwSoundBytes, 
				      &lpvPtr1, &dwBytes1, &lpvPtr2, &dwBytes2, 0); 
    } 
    if SUCCEEDED(hr) { 
	pj_memcpy(lpvPtr1, lpbSoundData, dwBytes1); 
	if (NULL != lpvPtr2) 
	    pj_memcpy(lpvPtr2, lpbSoundData+dwBytes1, dwBytes2); 
	
	hr = IDirectSoundBuffer_Unlock(lpDsb, lpvPtr1, dwBytes1, lpvPtr2, dwBytes2); 
	if SUCCEEDED(hr)
	    return TRUE; 
    } 
    
    return FALSE; 
}

static Uint8 *
DSOUND_GetDeviceBuf(_THIS)
{
    DWORD cursor = 0;
    DWORD junk = 0;
    HRESULT result = DS_OK;
    DWORD rawlen = 0;

    /* Figure out which blocks to fill next */
    this->hidden->locked_buf = NULL;
    result = IDirectSoundBuffer_GetCurrentPosition(this->hidden->mixbuf,
                                                   &junk, &cursor);
    if (result == DSERR_BUFFERLOST) {
        IDirectSoundBuffer_Restore(this->hidden->mixbuf);
        result = IDirectSoundBuffer_GetCurrentPosition(this->hidden->mixbuf,
                                                       &junk, &cursor);
    }
    if (result != DS_OK) {
        SetDSerror("DirectSound GetCurrentPosition", result);
        return (NULL);
    }
    cursor /= this->hidden->mixlen;
#ifdef DEBUG_SOUND
    /* Detect audio dropouts */
    {
        DWORD spot = cursor;
        if (spot < this->hidden->lastchunk) {
            spot += this->hidden->num_buffers;
        }
        if (spot > this->hidden->lastchunk + 1) {
            fprintf(stderr, "Audio dropout, missed %d fragments\n",
                    (spot - (this->hidden->lastchunk + 1)));
        }
    }
#endif
    this->hidden->lastchunk = cursor;
    cursor = (cursor + 1) % this->hidden->num_buffers;
    cursor *= this->hidden->mixlen;

    /* Lock the audio buffer */
    result = IDirectSoundBuffer_Lock(this->hidden->mixbuf, cursor,
                                     this->hidden->mixlen,
                                     (LPVOID *) & this->hidden->locked_buf,
                                     &rawlen, NULL, &junk, 0);
    if (result == DSERR_BUFFERLOST) {
        IDirectSoundBuffer_Restore(this->hidden->mixbuf);
        result = IDirectSoundBuffer_Lock(this->hidden->mixbuf, cursor,
                                         this->hidden->mixlen,
                                         (LPVOID *) & this->
                                         hidden->locked_buf, &rawlen, NULL,
                                         &junk, 0);
    }
    if (result != DS_OK) {
        SetDSerror("DirectSound Lock", result);
        return (NULL);
    }
    return (this->hidden->locked_buf);
}

/**
\brief fill sound buffer
\param data pointer to the sound data to copy
\param len length of the data to copy in bytes
\return number of copyed bytes
*/
static int write_buffer(struct ao *ao, unsigned char *data, int len)
{
    struct priv *p = ao->priv;
    HRESULT res;
    LPVOID lpvPtr1;
    DWORD dwBytes1;
    LPVOID lpvPtr2;
    DWORD dwBytes2;

    p->underrun_check = 0;

    // Lock the buffer
    res = IDirectSoundBuffer_Lock(p->hdsbuf, p->write_offset, len, &lpvPtr1,
                                  &dwBytes1, &lpvPtr2, &dwBytes2, 0);
    // If the buffer was lost, restore and retry lock.
    if (DSERR_BUFFERLOST == res) {
        IDirectSoundBuffer_Restore(p->hdsbuf);
        res = IDirectSoundBuffer_Lock(p->hdsbuf, p->write_offset, len, &lpvPtr1,
                                      &dwBytes1, &lpvPtr2, &dwBytes2, 0);
    }


    if (SUCCEEDED(res)) {
        if (!AF_FORMAT_IS_AC3(ao->format)) {
            memcpy(lpvPtr1, data, dwBytes1);
            if (lpvPtr2 != NULL)
                memcpy(lpvPtr2, (char *)data + dwBytes1, dwBytes2);

            p->write_offset += dwBytes1 + dwBytes2;
            if (p->write_offset >= p->buffer_size)
                p->write_offset = dwBytes2;
        } else {
            // Write to pointers without reordering.
            memcpy(lpvPtr1, data, dwBytes1);
            if (NULL != lpvPtr2)
                memcpy(lpvPtr2, data + dwBytes1, dwBytes2);
            p->write_offset += dwBytes1 + dwBytes2;
            if (p->write_offset >= p->buffer_size)
                p->write_offset = dwBytes2;
        }

        // Release the data back to DirectSound.
        res = IDirectSoundBuffer_Unlock(p->hdsbuf, lpvPtr1, dwBytes1, lpvPtr2,
                                        dwBytes2);
        if (SUCCEEDED(res)) {
            // Success.
            DWORD status;
            IDirectSoundBuffer_GetStatus(p->hdsbuf, &status);
            if (!(status & DSBSTATUS_PLAYING))
                res = IDirectSoundBuffer_Play(p->hdsbuf, 0, 0, DSBPLAY_LOOPING);
            return dwBytes1 + dwBytes2;
        }
    }
    // Lock, Unlock, or Restore failed.
    return 0;
}

static Uint8 *DX5_GetAudioBuf(_THIS)
{
	DWORD   cursor, junk;
	HRESULT result;
	DWORD   rawlen;

	/* Figure out which blocks to fill next */
	locked_buf = NULL;
	result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, &junk, &cursor);
	if ( result == DSERR_BUFFERLOST ) {
		IDirectSoundBuffer_Restore(mixbuf);
		result = IDirectSoundBuffer_GetCurrentPosition(mixbuf,
								&junk, &cursor);
	}
	if ( result != DS_OK ) {
		SetDSerror("DirectSound GetCurrentPosition", result);
		return(NULL);
	}
	cursor /= mixlen;
#ifdef DEBUG_SOUND
	/* Detect audio dropouts */
	{ DWORD spot = cursor;
	  if ( spot < lastchunk ) {
	    spot += NUM_BUFFERS;
	  }
	  if ( spot > lastchunk+1 ) {
	    fprintf(stderr, "Audio dropout, missed %d fragments\n",
	            (spot - (lastchunk+1)));
	  }
	}
#endif
	lastchunk = cursor;
	cursor = (cursor+1)%NUM_BUFFERS;
	cursor *= mixlen;

	/* Lock the audio buffer */
	result = IDirectSoundBuffer_Lock(mixbuf, cursor, mixlen,
				(LPVOID *)&locked_buf, &rawlen, NULL, &junk, 0);
	if ( result == DSERR_BUFFERLOST ) {
		IDirectSoundBuffer_Restore(mixbuf);
		result = IDirectSoundBuffer_Lock(mixbuf, cursor, mixlen,
				(LPVOID *)&locked_buf, &rawlen, NULL, &junk, 0);
	}
	if ( result != DS_OK ) {
		SetDSerror("DirectSound Lock", result);
		return(NULL);
	}
	return(locked_buf);
}

HRESULT DSW_ZeroEmptySpace( DSoundWrapper *dsw )
{
	HRESULT hr;
	LPBYTE lpbuf1 = NULL;
	LPBYTE lpbuf2 = NULL;
	DWORD dwsize1 = 0;
	DWORD dwsize2 = 0;
	long  bytesEmpty;
	hr = DSW_QueryOutputSpace( dsw, &bytesEmpty ); // updates dsw_FramesPlayed
	if (hr != DS_OK) return hr;
	if( bytesEmpty == 0 ) return DS_OK;
	// Lock free space in the DS
	hr = IDirectSoundBuffer_Lock( dsw->dsw_OutputBuffer, dsw->dsw_WriteOffset, bytesEmpty, (void **) &lpbuf1, &dwsize1,
		(void **) &lpbuf2, &dwsize2, 0);
	if (hr == DS_OK)
	{
		// Copy the buffer into the DS
		ZeroMemory(lpbuf1, dwsize1);
		if(lpbuf2 != NULL)
		{
			ZeroMemory(lpbuf2, dwsize2);
		}
		// Update our buffer offset and unlock sound buffer
 		dsw->dsw_WriteOffset = (dsw->dsw_WriteOffset + dwsize1 + dwsize2) % dsw->dsw_OutputSize;
		IDirectSoundBuffer_Unlock( dsw->dsw_OutputBuffer, lpbuf1, dwsize1, lpbuf2, dwsize2);
		dsw->dsw_FramesWritten += bytesEmpty / dsw->dsw_BytesPerFrame;
	}
	return hr;
}

HRESULT DSW_WriteBlock( DSoundWrapper *dsw, char *buf, long numBytes )
{
	HRESULT hr;
	LPBYTE lpbuf1 = NULL;
	LPBYTE lpbuf2 = NULL;
	DWORD dwsize1 = 0;
	DWORD dwsize2 = 0;
	// Lock free space in the DS
	hr = IDirectSoundBuffer_Lock( dsw->dsw_OutputBuffer, dsw->dsw_WriteOffset, numBytes, (void **) &lpbuf1, &dwsize1,
		(void **) &lpbuf2, &dwsize2, 0);
	if (hr == DS_OK)
	{
		// Copy the buffer into the DS
		CopyMemory(lpbuf1, buf, dwsize1);
		if(lpbuf2 != NULL)
		{
			CopyMemory(lpbuf2, buf+dwsize1, dwsize2);
		}
		// Update our buffer offset and unlock sound buffer
 		dsw->dsw_WriteOffset = (dsw->dsw_WriteOffset + dwsize1 + dwsize2) % dsw->dsw_OutputSize;
		IDirectSoundBuffer_Unlock( dsw->dsw_OutputBuffer, lpbuf1, dwsize1, lpbuf2, dwsize2);
		dsw->dsw_FramesWritten += numBytes / dsw->dsw_BytesPerFrame;
	}
	return hr;
}

static void dx_clear(void)
{
LPVOID  lpvPtr1;
DWORD   dwBytes1;
LPVOID  lpvPtr2;
DWORD   dwBytes2;
HRESULT result;

    result = IDirectSoundBuffer_Lock(buffer, 0, buffer_size,
                                     &lpvPtr1, &dwBytes1, &lpvPtr2,
                                     &dwBytes2, 0);
    if (result == DSERR_BUFFERLOST) {
        IDirectSoundBuffer_Restore(buffer);
    } else {
        if (is16bit) {
            memset(lpvPtr1, 0, dwBytes1);
            if (lpvPtr2) memset(lpvPtr2, 0, dwBytes2);
        } else {
            memset(lpvPtr1, 0x80, dwBytes1);
            if (lpvPtr2) memset(lpvPtr2, 0x80, dwBytes2);
        }
        result = IDirectSoundBuffer_Unlock(buffer, lpvPtr1, dwBytes1,
                                           lpvPtr2, dwBytes2);
    }
}

void m1sdr_TimeCheck(void)
{
	int nPlaySeg=0, nFollowingSeg=0;
	DWORD nPlay=0, nWrite=0;
	int nRet=0;

	if (!lpDS) return;

	// We should do nothing until nPlay has left nDSoundNextSeg
	IDirectSoundBuffer_GetCurrentPosition(lpSecB, &nPlay, &nWrite);

	nPlaySeg=nPlay/(nDSoundSegLen<<2);

	if (nPlaySeg>nDSoundSegCount-1) nPlaySeg=nDSoundSegCount-1;
	if (nPlaySeg<0) nPlaySeg=0; // important to ensure nPlaySeg clipped for below

	if (nDSoundNextSeg == nPlaySeg)
	{
		Sleep(200); // Don't need to do anything for a bit
		goto End;
	}

	// work out which seg we will fill next
	nFollowingSeg = nDSoundNextSeg; 
	WRAP_INC(nFollowingSeg)

	while (nDSoundNextSeg != nPlaySeg)
	{
		void *pData=NULL,*pData2=NULL; DWORD cbLen=0,cbLen2=0;

		// fill nNextSeg
		// Lock the relevant seg of the loop buffer
		nRet = IDirectSoundBuffer_Lock(lpSecB, nDSoundNextSeg*(nDSoundSegLen<<2), nDSoundSegLen<<2, &pData, &cbLen, &pData2, &cbLen2, 0);

		if (nRet>=0 && pData!=NULL)
		{
		  // Locked the seg okay - write the sound we calculated last time
			memcpy(pData, samples, nDSoundSegLen<<2);
		}
		// Unlock (2nd 0 is because we wrote nothing to second part)
		if (nRet>=0) IDirectSoundBuffer_Unlock(lpSecB, pData, cbLen, pData2, 0); 

		// generate more samples
		if (m1sdr_Callback)
		{
			m1sdr_Callback(nDSoundSegLen, samples);
			playtime++;
		}
		else
		{
			memset(samples, 0, nDSoundSegLen*4);
		}

		nDSoundNextSeg = nFollowingSeg;
		WRAP_INC(nFollowingSeg)
	}

End:
	return;
}

static DWORD WINAPI updateBufferProc(LPVOID lpParameter)
{
	LPVOID pBlock1 = NULL, pBlock2 = NULL;
	DWORD soundBufferCurrentPosition, blockBytes1, blockBytes2;
	DWORD start;

	while (threadInUse) {
		if (WaitForSingleObject(notifyUpdateHandle,INFINITE)==WAIT_OBJECT_0) {

			if (!threadInUse) break;

			IDirectSoundBuffer_GetCurrentPosition
						(pSoundBuffer,&soundBufferCurrentPosition,NULL);

			if (soundBufferCurrentPosition < fragsize)
				start = fragsize;
			else
				start = 0;

			if (IDirectSoundBuffer_Lock
						(pSoundBuffer,start,fragsize,&pBlock1,&blockBytes1,
						 &pBlock2,&blockBytes2,0)==DSERR_BUFFERLOST) {
				IDirectSoundBuffer_Restore(pSoundBuffer);
				IDirectSoundBuffer_Lock
						(pSoundBuffer,start,fragsize,&pBlock1,&blockBytes1,
						 &pBlock2,&blockBytes2,0);
			}

			MUTEX_LOCK(vars);
			if (Player_Paused_internal()) {
				VC_SilenceBytes((SBYTE*)pBlock1,(ULONG)blockBytes1);
				if (pBlock2)
					VC_SilenceBytes((SBYTE*)pBlock2,(ULONG)blockBytes2);
			} else {
				VC_WriteBytes((SBYTE*)pBlock1,(ULONG)blockBytes1);
				if (pBlock2)
					VC_WriteBytes((SBYTE*)pBlock2,(ULONG)blockBytes2);
			}
			MUTEX_UNLOCK(vars);

			IDirectSoundBuffer_Unlock
						(pSoundBuffer,pBlock1,blockBytes1,pBlock2,blockBytes2);
		}
	}
	return 0;
}

void DSSoundFeedVoiceData(unsigned char* pSound,long lBytes)
{
	LPVOID lpvPtr1, lpvPtr2;
	unsigned long dwBytes1,dwBytes2;
	unsigned long *lpSS, *lpSD;
	unsigned long dw,cplay,cwrite;
	HRESULT hr;
	unsigned long status;

	IDirectSoundBuffer_GetStatus(lpDSBSECONDARY1,&status);
	if (status & DSBSTATUS_BUFFERLOST)
	{
		if (IDirectSoundBuffer_Restore(lpDSBSECONDARY1) != DS_OK) return;
		IDirectSoundBuffer_Play(lpDSBSECONDARY1,0,0,DSBPLAY_LOOPING);
	}

	IDirectSoundBuffer_GetCurrentPosition(lpDSBSECONDARY1,&cplay,&cwrite);

	if(LastWrite == 0xffffffff) LastWrite=cwrite;

	hr = IDirectSoundBuffer_Lock(lpDSBSECONDARY1,LastWrite,lBytes,
        &lpvPtr1, &dwBytes1, &lpvPtr2, &dwBytes2, 0);

	if (hr != DS_OK)
	{
		LastWrite=0xffffffff;
		return;
	}

	lpSS = (unsigned long *)pSound;
	lpSD = (unsigned long *)lpvPtr1;
	dw = dwBytes1 >> 2;

	while(dw)
	{
		*lpSD++=*lpSS++;
		dw--;
	}

	if (lpvPtr2)
	{
		lpSD = (unsigned long *)lpvPtr2;
		dw = dwBytes2 >> 2;

		while(dw)
		{
			*lpSD++ = *lpSS++;
			dw--;
		}
	}

	IDirectSoundBuffer_Unlock(lpDSBSECONDARY1,lpvPtr1,dwBytes1,lpvPtr2,dwBytes2);
	LastWrite += lBytes;
	if(LastWrite >= SOUNDSIZE) LastWrite -= SOUNDSIZE;
	LastPlay = cplay;
}

static inline bool grab_region(dsound_t *ds, DWORD write_ptr, struct audio_lock *region)
{
   HRESULT res = IDirectSoundBuffer_Lock(ds->dsb, write_ptr, CHUNK_SIZE, &region->chunk1, &region->size1, &region->chunk2, &region->size2, 0);
   if (res == DSERR_BUFFERLOST)
   {
      res = IDirectSoundBuffer_Restore(ds->dsb);
      if (res != DS_OK)
         return false;

      res = IDirectSoundBuffer_Lock(ds->dsb, write_ptr, CHUNK_SIZE, &region->chunk1, &region->size1, &region->chunk2, &region->size2, 0);
      if (res != DS_OK)
         return false;
   }

   const char *err;
   switch (res)
   {
      case DSERR_BUFFERLOST:
         err = "DSERR_BUFFERLOST";
         break;
      case DSERR_INVALIDCALL:
         err = "DSERR_INVALIDCALL";
         break;
      case DSERR_INVALIDPARAM:
         err = "DSERR_INVALIDPARAM";
         break;
      case DSERR_PRIOLEVELNEEDED:
         err = "DSERR_PRIOLEVELNEEDED";
         break;

      default:
         err = NULL;
   }

   if (err)
   {
      RARCH_WARN("[DirectSound error]: %s\n", err);
      return false;
   }

   return true;
}

static void clear_buffers(ds_t *ds)
{
    ds->writering = ds->rings - 1;

    DWORD size;
    void *output;
    if (IDirectSoundBuffer_Lock(ds->dsb, 0, 0, &output, &size, 0, 0, DSBLOCK_ENTIREBUFFER) == DS_OK)
    {
        memset(output, 0, size);
        IDirectSoundBuffer_Unlock(ds->dsb, output, size, 0, 0);
    }
}

static void dsound_clear_buffer(dsound_t *ds)
{
   IDirectSoundBuffer_SetCurrentPosition(ds->dsb, 0);
   void *ptr;
   DWORD size;

   if (IDirectSoundBuffer_Lock(ds->dsb, 0, 0, &ptr, &size, NULL, NULL, DSBLOCK_ENTIREBUFFER) == DS_OK)
   {
      memset(ptr, 0, size);
      IDirectSoundBuffer_Unlock(ds->dsb, ptr, size, NULL, 0);
   }
}

int DSOUND_UpdatePlayback(soundplay_t *sp, int samplechunks, char *buffer)
{
	int ret;
	dsplay_t *dsp = (dsplay_t*)sp;
	char *sbuf;
	int sbufsize;
	int writable;
	int remaining = samplechunks;

	if (!samplechunks)
		return 0;

	IDirectSoundBuffer_GetCurrentPosition(dsp->dsbuf, &dsp->readpos, NULL);
	dsp->readpos /= dsp->sampbytes;

	while (ret = IDirectSoundBuffer_Lock(dsp->dsbuf, 0, dsp->buffersize*dsp->sampbytes, (void**)&sbuf, &sbufsize, NULL, NULL, 0))
	{
		if (!FAILED(ret))
			break;
		if (ret == DSERR_BUFFERLOST)
			printf("Buffer lost\n");
		else
			break;

//			if (FAILED(IDirectSoundBuffer_Resore(dsp->dsbuf)))
//				return 0;
	}
	//memset(sbuf, 0, sbufsize);
	writable = remaining;
	if (writable > sbufsize/dsp->sampbytes - dsp->writepos)
		writable = sbufsize/dsp->sampbytes - dsp->writepos;
	memcpy(sbuf+dsp->writepos*dsp->sampbytes, buffer, writable*dsp->sampbytes);
	remaining -= writable;
	buffer += writable*dsp->sampbytes;
	dsp->writepos += writable;
	dsp->writepos %= dsp->buffersize;
	if (samplechunks > 0)
	{
		writable = remaining;
		if (writable > dsp->readpos)
			writable = dsp->readpos;
		memcpy(sbuf, buffer, writable*dsp->sampbytes);
		remaining -= writable;
		dsp->writepos += writable;
		dsp->writepos %= dsp->buffersize;
	}
	IDirectSoundBuffer_Unlock(dsp->dsbuf, sbuf, sbufsize, NULL, 0);

	printf("%i %i\n", 100*dsp->readpos / dsp->buffersize, 100*dsp->writepos / dsp->buffersize);

	return samplechunks - remaining;
}