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windows-nt/Source/XPSP1/NT/base/mvdm/vdd/vsndblst/dsp.c

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2020-09-26 03:20:57 -05:00
/***************************************************************************
*
* dsp.c
*
* Copyright (c) 1991-1996 Microsoft Corporation. All Rights Reserved.
*
* This code provides VDD support for SB 2.0 sound output, specifically:
* DSP 2.01+ (excluding SB-MIDI port)
*
***************************************************************************/
/*****************************************************************************
*
* #includes
*
*****************************************************************************/
#include <windows.h> // The VDD is a win32 DLL
#include <mmsystem.h> // Multi-media APIs
#include <vddsvc.h> // Definition of VDD calls
#include <vsb.h>
#include <dsp.h>
/*****************************************************************************
*
* Globals
*
*****************************************************************************/
//
// Definitions for MM api entry points. The functions will be linked
// dynamically to avoid bringing winmm.dll in before wow32.
//
extern SETVOLUMEPROC SetVolumeProc;
extern GETNUMDEVSPROC GetNumDevsProc;
extern GETDEVCAPSPROC GetDevCapsProc;
extern OPENPROC OpenProc;
extern RESETPROC ResetProc;
extern CLOSEPROC CloseProc;
extern GETPOSITIONPROC GetPositionProc;
extern WRITEPROC WriteProc;
extern PREPAREHEADERPROC PrepareHeaderProc;
extern UNPREPAREHEADERPROC UnprepareHeaderProc;
/*
* General globals
*/
extern HINSTANCE GlobalHInstance; // handle passed to dll entry point
BYTE IdentByte; // used with DSP_CARD_IDENTIFY
BOOL SpeakerOn = FALSE; // TRUE when speaker is on
BYTE ReservedRegister; // used with DSP_LOAD_RES_REG and DSP_READ_RES_REG
ULONG PageSize; // size of pages for VirtualAlloc
ULONG iHdr; // used to index wavehdr array
/*
* Event Globals
*/
HANDLE SingleWaveSem; // used by app to indicate data to write
HANDLE PauseEvent; // used to restart paused single
HANDLE ThreadStarted; // signalled when thread starts running
HANDLE ThreadFinished; // signalled when thread exits
/*
* Wave globals
*/
UINT WaveOutDevice; // device identifier
HWAVEOUT HWaveOut = NULL; // the current open wave output device
PCMWAVEFORMAT WaveFormat = { { WAVE_FORMAT_PCM, 1, 0, 0, 1 }, 8};
DWORD TimeConstant = (256 - 1000000/11025); // one byte format
DWORD SBBlockSize = 0x800; // Block size set by apps, always size of transfer-1
DWORD LookAheadFactor = DEFAULT_LOOKAHEAD;
VDD_DMA_INFO dMAInfo;
DWORD dMAPhysicalStart; // the starting address for this transfer
DWORD dMACurrentPosition; // where we are currently reading from
DWORD dMAVirtualStart; // what the app thinks the addr is for this transfer
ULONG dMASize; // the size of the DMA memory-1
WAVEHDR * WaveHdrs; // pointer to allocated wave headers
BYTE * WaveData; // pointer to allocated wave buffer
ULONG TotalNumberOfBursts;
ULONG BurstsPerBlock;
ULONG DesiredBytesOutstanding;
ULONG BytesOutstanding = 0;
ULONG PhysicalBytesPlayed = 0;
ULONG LastBytesPlayedValue;
BOOL bDspActive = FALSE; // dsp thread currently active, changed with interlocked
BOOL bDspPause = FALSE; // dsp paused, changed with interlocked
BOOL bDspReset = FALSE; // dsp stopped, changed with interlocked
enum {
Auto,
Single
} DspMode;
/*****************************************************************************
*
* State Machines
*
*****************************************************************************/
/*
* DSP Reset State Machine
*/
enum {
ResetNotStarted = 1,
Reset1Written
}
ResetState = ResetNotStarted; // state of current reset
/*
* DSP Write State Machine
*/
enum {
WriteCommand = 1, // Initial state and after reset
CardIdent,
TableMunge,
LoadResReg,
SetTimeConstant,
BlockSizeFirstByte,
BlockSizeSecondByte,
BlockSizeFirstByteWrite,
BlockSizeSecondByteWrite,
BlockSizeFirstByteRead,
BlockSizeSecondByteRead
}
DSPWriteState = WriteCommand; // state of current command/data being written
/*
* DSP Read State Machine
*/
enum {
NothingToRead = 1, // initial state and after reset
Reset,
FirstVersionByte,
SecondVersionByte,
ReadIdent,
ReadResReg
}
DSPReadState = NothingToRead; // state of current command/data being read
/*****************************************************************************
*
* General Functions
*
*****************************************************************************/
BOOL
DspProcessAttach(
VOID
)
{
HKEY hKey;
ULONG dwType;
ULONG cbData;
SYSTEM_INFO SystemInfo;
// create synchronization events
PauseEvent=CreateEvent(NULL, FALSE, FALSE, NULL);
SingleWaveSem=CreateSemaphore(NULL, 1, 100, NULL);
ThreadStarted=CreateEvent(NULL, FALSE, FALSE, NULL);
ThreadFinished=CreateEvent(NULL, FALSE, FALSE, NULL);
if (!RegOpenKeyEx (HKEY_LOCAL_MACHINE,
VSBD_PATH,
0,
KEY_EXECUTE, // Requesting read access.
&hKey)) {
cbData = sizeof(ULONG);
RegQueryValueEx(hKey,
LOOKAHEAD_VALUE,
NULL,
&dwType,
(LPSTR)&LookAheadFactor,
&cbData);
RegCloseKey(hKey);
}
// Allocate memory for wave buffer
WaveData = (BYTE *) VirtualAlloc(NULL,
64*1024,
MEM_RESERVE,
PAGE_READWRITE);
if(WaveData == NULL ) {
dprintf1(("Unable to allocate memory"));
return(FALSE);
}
GetSystemInfo(&SystemInfo);
PageSize = SystemInfo.dwPageSize;
return TRUE;
}
VOID
DspProcessDetach(
VOID
)
{
// stop any active threads
StopAutoWave(FALSE);
StopSingleWave(FALSE);
// close synchronization events
CloseHandle(PauseEvent);
CloseHandle(SingleWaveSem);
CloseHandle(ThreadStarted);
CloseHandle(ThreadFinished);
VirtualFree(WaveData, 0, MEM_RELEASE);
}
/***************************************************************************/
/*
* Gets called when the application reads from port.
* Returns results to application in data.
*/
VOID
DspReadStatus(
BYTE * data
)
{
// See if we think there is something to read
*data = DSPReadState != NothingToRead ? 0xFF : 0x7F;
}
VOID
DspReadData(
BYTE * data
)
{
switch (DSPReadState) {
case NothingToRead:
*data = 0xFF;
break;
case Reset:
*data = 0xAA;
DSPReadState = NothingToRead;
break;
case FirstVersionByte:
*data = (BYTE)(SB_VERSION / 256);
DSPReadState = SecondVersionByte;
break;
case SecondVersionByte:
*data = (BYTE)(SB_VERSION % 256);
DSPReadState = NothingToRead;
break;
case ReadIdent:
*data = ~IdentByte;
DSPReadState = NothingToRead;
break;
case ReadResReg:
*data = ReservedRegister;
DSPReadState = NothingToRead;
break;
default:
dprintf1(("Unrecognized read state"));
}
}
/***************************************************************************/
/*
* Gets called when an application writes data to port.
*/
VOID
DspResetWrite(
BYTE data
)
{
if (data == 1) {
ResetState = Reset1Written;
}
else {
if (ResetState == Reset1Written && data == 0) {
ResetState = ResetNotStarted;
ResetAll(); // OK - reset everything
}
}
}
VOID
DspWrite(
BYTE data
)
{
DWORD ddata;
switch (DSPWriteState) {
case WriteCommand:
WriteCommandByte(data);
break;
case CardIdent:
IdentByte = data;
DSPReadState = ReadIdent;
DSPWriteState = WriteCommand;
break;
case TableMunge:
TableMunger(data);
DSPWriteState = WriteCommand;
break;
case LoadResReg:
ReservedRegister = data;
DSPWriteState = WriteCommand;
break;
case SetTimeConstant:
TimeConstant = (DWORD)data;
dprintf3(("Time constant is %X", TimeConstant));
dprintf3(("Set sampling rate %d", GetSamplingRate()));
DSPWriteState = WriteCommand;
break;
case BlockSizeFirstByte:
SBBlockSize = (DWORD)data;
DSPWriteState = BlockSizeSecondByte;
break;
case BlockSizeSecondByte:
ddata = data;
SBBlockSize = SBBlockSize + (ddata << 8);
DSPWriteState = WriteCommand;
dprintf2(("Block size set to 0x%x", SBBlockSize));
break;
case BlockSizeFirstByteWrite:
SBBlockSize = (DWORD)data;
DSPWriteState = BlockSizeSecondByteWrite;
break;
case BlockSizeSecondByteWrite:
ddata = data;
SBBlockSize = SBBlockSize + (ddata << 8);
DSPWriteState = WriteCommand;
dprintf3(("Block size set to 0x%x", SBBlockSize));
// this is a hack to convince some apps a sb exists
if(SBBlockSize==0) {
VDM_TRACE(0x6a0,0,0);
GenerateInterrupt();
}
StartSingleWave();
break;
case BlockSizeFirstByteRead:
SBBlockSize = (DWORD)data;
DSPWriteState = BlockSizeSecondByteRead;
break;
case BlockSizeSecondByteRead:
ddata = data;
SBBlockSize = SBBlockSize + (ddata << 8);
DSPWriteState = WriteCommand;
dprintf3(("Block size set to 0x%x", SBBlockSize));
// this is a hack to convince some apps a sb exists
if(SBBlockSize==0) {
ULONG dMAPhysicalAddress;
if((dMAPhysicalAddress=GetDMATransferAddress()) != -1L) {
*(PUCHAR)dMAPhysicalAddress = 0x80;
}
VDM_TRACE(0x6a0,0,0);
GenerateInterrupt();
}
break;
}
}
/***************************************************************************/
/*
* Handles commands sent to the DSP.
*/
VOID
WriteCommandByte(
BYTE command
)
{
switch (command) {
case DSP_GET_VERSION:
dprintf2(("Command - Get Version"));
DSPReadState = FirstVersionByte;
break;
case DSP_CARD_IDENTIFY:
dprintf2(("Command - Identify"));
DSPWriteState = CardIdent;
break;
case DSP_TABLE_MUNGE:
dprintf2(("Command - DSP Table Munge"));
DSPWriteState = TableMunge;
break;
case DSP_LOAD_RES_REG:
dprintf2(("Command - Load Res Reg"));
DSPWriteState = LoadResReg;
break;
case DSP_READ_RES_REG:
dprintf2(("Command - Read Res Reg"));
DSPReadState = ReadResReg;
break;
case DSP_GENERATE_INT:
dprintf2(("Command - Generate interrupt DMA"));
GenerateInterrupt();
break;
case DSP_SPEAKER_ON:
dprintf2(("Command - Speaker ON"));
SetSpeaker(TRUE);
break;
case DSP_SPEAKER_OFF:
dprintf2(("Command - Speaker OFF"));
SetSpeaker(FALSE);
break;
case DSP_SET_SAMPLE_RATE:
dprintf3(("Command - Set Sample Rate"));
DSPWriteState = SetTimeConstant;
break;
case DSP_SET_BLOCK_SIZE:
dprintf2(("Command - Set Block Size"));
DSPWriteState = BlockSizeFirstByte;
break;
case DSP_PAUSE_DMA:
dprintf2(("Command - Pause DMA"));
PauseDMA();
break;
case DSP_CONTINUE_DMA:
dprintf2(("Command - Continue DMA"));
ContinueDMA();
break;
case DSP_STOP_AUTO:
dprintf2(("Command - Stop DMA"));
StopAutoWave(TRUE);
break;
case DSP_WRITE:
case DSP_WRITE_HS:
dprintf3(("Command - Write - non Auto"));
DSPWriteState = BlockSizeFirstByteWrite;
break;
case DSP_WRITE_AUTO:
case DSP_WRITE_HS_AUTO:
dprintf2(("Command - Write - Auto"));
StartAutoWave();
break;
case DSP_READ:
dprintf3(("Command - Read - non Auto"));
DSPWriteState = BlockSizeFirstByteRead;
break;
default:
dprintf1(("Unrecognized DSP command %2X", command));
}
}
/*****************************************************************************
*
* Device manipulation and control routines
*
*****************************************************************************/
/*
* Reset threads/globals/events/state-machines to initial state.
*/
VOID
ResetDSP(
VOID
)
{
// Stop any active DMA threads
StopAutoWave(TRUE);
StopSingleWave(TRUE);
// Set events and globals to initial state
ResetEvent(PauseEvent);
CloseHandle(SingleWaveSem);
SingleWaveSem=CreateSemaphore(NULL, 1, 100, NULL);
ResetEvent(ThreadStarted);
ResetEvent(ThreadFinished);
SetSpeaker(FALSE);
SpeakerOn = FALSE;
HWaveOut = NULL;
TimeConstant = (256 - 1000000/11025);
WaveFormat.wf.nSamplesPerSec = 0;
WaveFormat.wf.nAvgBytesPerSec = 0;
SBBlockSize = 0x800;
bDspActive = FALSE;
bDspReset = FALSE;
bDspPause = FALSE;
// Reset state machines
DSPReadState = Reset;
DSPWriteState = WriteCommand;
}
/***************************************************************************/
/*
* Munges (changes) a jump table in apps code,
* Algorithm from sbvirt.asm in MMSNDSYS.
*/
VOID
TableMunger(
BYTE data
)
{
static BYTE TableMungeData;
static BOOL TableMungeFirstByte = TRUE; // munging first or second byte
BYTE comp, dataCopy;
VDD_DMA_INFO dMAInfo;
ULONG dMAPhysicalAddress;
if(TableMungeFirstByte) {
dprintf2(("Munging first byte"));
dataCopy = data;
dataCopy = dataCopy & 0x06;
dataCopy = dataCopy << 1;
if(data & 0x10) {
comp = 0x40;
}
else {
comp = 0x20;
}
comp = comp - dataCopy;
data = data + comp;
TableMungeData = data;
// Update memory (code table) with munged data
dprintf2(("Writing first byte"));
if((dMAPhysicalAddress=GetDMATransferAddress()) == -1L) {
dprintf1(("Unable to get dma address"));
return;
}
CopyMemory((PVOID)dMAPhysicalAddress, &data, 1);
// Update virtual DMA status
VDDQueryDMA((HANDLE)GlobalHInstance, SB_DMA_CHANNEL, &dMAInfo);
dprintf4(("DMA Info : addr %4X, count %4X, page %4X, status %2X, mode %2X, mask %2X",
dMAInfo.addr, dMAInfo.count, dMAInfo.page, dMAInfo.status,
dMAInfo.mode, dMAInfo.mask));
dMAInfo.count = dMAInfo.count - 1;
dMAInfo.addr = dMAInfo.addr + 1;
VDDSetDMA((HANDLE)GlobalHInstance, SB_DMA_CHANNEL,
VDD_DMA_COUNT|VDD_DMA_ADDR, &dMAInfo);
TableMungeFirstByte = FALSE;
}
else {
dprintf2(("Munging second byte"));
data = data ^ 0xA5;
data = data + TableMungeData;
TableMungeData = data;
// Update memory (code table) with munged data
dprintf2(("Writing second byte"));
if((dMAPhysicalAddress=GetDMATransferAddress()) == -1L) {
dprintf1(("Unable to get dma address"));
return;
}
CopyMemory((PVOID)dMAPhysicalAddress, &data, 1);
// Update virtual DMA status
VDDQueryDMA((HANDLE)GlobalHInstance, SB_DMA_CHANNEL, &dMAInfo);
dMAInfo.count = dMAInfo.count - 1;
dMAInfo.addr = dMAInfo.addr + 1;
VDDSetDMA((HANDLE)GlobalHInstance, SB_DMA_CHANNEL,
VDD_DMA_COUNT|VDD_DMA_ADDR, &dMAInfo);
if(dMAInfo.count==0xFFFF) {
SetDMAStatus(FALSE, TRUE);
}
TableMungeFirstByte = TRUE;
}
}
/***************************************************************************/
/*
* Get sampling rate from time constant.
* Returns sampling rate.
*/
DWORD
GetSamplingRate(
VOID
)
{
// Sampling rate = 1000000 / (256 - Time constant)
return(1000000 / (256 - TimeConstant));
}
/***************************************************************************/
/*
* Generate device interrupt on dma channel SM_INTERRUPT on ICA_MASTER device.
*/
VOID
GenerateInterrupt(
VOID
)
{
// Generate an interrupt on the master controller
dprintf3(("Generating interrupt"));
VDM_TRACE(0x6a1,0,0);
VDDSimulateInterrupt(ICA_MASTER, SB_INTERRUPT, 1);
}
/***************************************************************************/
/*
* Sets the speaker on or off.
*/
VOID
SetSpeaker(
BOOL On
)
{
if (HWaveOut) {
if(On) {
SetVolumeProc(HWaveOut, (DWORD)0x77777777UL);
SpeakerOn = TRUE;
}
else {
SetVolumeProc(HWaveOut, (DWORD)0x00000000UL);
SpeakerOn = FALSE;
}
}
return;
}
/****************************************************************************
*
* Wave device routines
*
****************************************************************************/
/*
* Find a suitable wave output device.
* Returns device or NO_DEVICE_FOUND if none found.
*/
UINT
FindWaveDevice(
VOID
)
{
UINT numDev;
UINT device;
WAVEOUTCAPS wc;
numDev = GetNumDevsProc();
for (device = 0; device < numDev; device++) {
if (MMSYSERR_NOERROR == GetDevCapsProc(device, &wc, sizeof(wc))) {
// Need 11025 and 44100 for device
if ((wc.dwFormats & (WAVE_FORMAT_1M08 | WAVE_FORMAT_4M08)) ==
(WAVE_FORMAT_1M08 | WAVE_FORMAT_4M08)) {
WaveOutDevice = device;
return TRUE;
}
}
}
dprintf1(("Wave device not found"));
return FALSE;
}
/***************************************************************************/
/*
* Open wave device and start synchronization thread.
* Returns TRUE on success.
*/
BOOL
OpenWaveDevice(
VOID
)
{
UINT rc;
HANDLE tHandle;
rc = OpenProc(&HWaveOut, (UINT)WaveOutDevice, (LPWAVEFORMATEX)
&WaveFormat, 0, 0, CALLBACK_NULL);
if (rc != MMSYSERR_NOERROR) {
dprintf1(("Failed to open wave device - code %d", rc));
return FALSE;
}
BytesOutstanding = 0;
PhysicalBytesPlayed = 0;
return TRUE;
}
/***************************************************************************/
/*
* Reset wave device.
*/
VOID
ResetWaveDevice(
VOID
)
{
// No synchronization required
dprintf2(("Resetting wave device"));
if (HWaveOut) {
if(MMSYSERR_NOERROR != ResetProc(HWaveOut)) {
dprintf1(("Unable to reset wave out device"));
}
}
}
/***************************************************************************/
/*
* Shut down and close wave device.
*/
VOID
CloseWaveDevice(
VOID
)
{
dprintf2(("Closing wave device"));
ResetWaveDevice();
if (HWaveOut) {
if(MMSYSERR_NOERROR != CloseProc(HWaveOut)) {
dprintf1(("Unable to close wave out device"));
} else {
HWaveOut = NULL;
dprintf2(("Wave out device closed"));
}
}
}
/***************************************************************************/
/*
* Returns TRUE if current wave device supports sample rate.
*/
BOOL
TestWaveFormat(
DWORD sampleRate
)
{
PCMWAVEFORMAT format;
format = WaveFormat;
format.wf.nSamplesPerSec = sampleRate;
format.wf.nAvgBytesPerSec = sampleRate;
return(MMSYSERR_NOERROR == OpenProc(NULL, (UINT)WaveOutDevice,
(LPWAVEFORMATEX) &format,
0, 0, WAVE_FORMAT_QUERY));
}
/***************************************************************************/
/*
* Make sure we've got a device that matches the current sampling rate.
* Returns TRUE if device does NOT support current sampling rate and
* wave format has changed, otherwise returns FALSE
*/
BOOL
SetWaveFormat(
VOID
)
{
DWORD sampleRate;
DWORD testValue;
UINT i = 0;
if (TimeConstant != 0xFFFF) {
// time constant has been reset since last checked
sampleRate = GetSamplingRate();
dprintf3(("Requested sample rate is %d", sampleRate));
if (sampleRate != WaveFormat.wf.nSamplesPerSec) { // format has changed
if (!TestWaveFormat(sampleRate)) {
dprintf3(("Finding closest wave format"));
// find some format that works and is close to requested
for(i=0; i<50000; i++) {
testValue = sampleRate-i;
if(TestWaveFormat(testValue)) {
sampleRate = testValue;
break;
}
testValue = sampleRate+i;
if(TestWaveFormat(testValue)) {
sampleRate = testValue;
break;
}
}
if(sampleRate!=testValue) {
dprintf1(("Unable to find suitable wave format"));
return FALSE;
}
}
// Set the new format if it's changed
if (sampleRate != WaveFormat.wf.nSamplesPerSec) {
dprintf2(("Setting %d samples per second", sampleRate));
WaveFormat.wf.nSamplesPerSec = sampleRate;
WaveFormat.wf.nAvgBytesPerSec = sampleRate;
TimeConstant = 0xFFFF;
return TRUE;
}
}
}
TimeConstant = 0xFFFF;
return FALSE;
}
/***************************************************************************/
/*
* Stops auto init DMA, or pauses single cycle DMA.
*/
VOID
PauseDMA(
VOID
)
{
DWORD position = 0;
MMTIME mmTime;
dprintf2(("Pausing DMA"));
switch(DspMode) {
case Auto:
StopAutoWave(TRUE); // simply stop auto dma
break;
case Single:
ResetEvent(PauseEvent);
InterlockedExchange(&bDspPause, 1);
}
}
/***************************************************************************/
/*
* Start auto init DMA, or continues single cycle DMA.
*/
VOID
ContinueDMA(
VOID
)
{
switch(DspMode) {
case Auto:
StartAutoWave();
break;
case Single:
SetEvent(PauseEvent);
}
}
/***************************************************************************/
/*
* Get DMA transfer address.
* Returns transfer address or -1 on failure.
*/
ULONG
GetDMATransferAddress(
VOID
)
{
ULONG address;
VDD_DMA_INFO dMAInfo;
if (VDDQueryDMA((HANDLE)GlobalHInstance, SB_DMA_CHANNEL, &dMAInfo)) {
dprintf4(("DMA Info : addr %4X, count %4X, page %4X, status %2X, mode %2X, mask %2X",
dMAInfo.addr, dMAInfo.count, dMAInfo.page, dMAInfo.status,
dMAInfo.mode, dMAInfo.mask));
// convert from 20 bit address to 32 bit address
address = (((DWORD)dMAInfo.page) << (12 + 16)) + dMAInfo.addr;
// get VDM pointer
address = (ULONG)GetVDMPointer(address, ((DWORD)dMAInfo.count) + 1, 0);
dprintf3(("Transfer address = %8X", (DWORD)address));
return(address);
}
else {
dprintf1(("Could not retrieve DMA Info"));
return(ULONG)(-1L);
}
}
/***************************************************************************/
/*
* Update the virtual DMA terminal count and request status.
* Terminal count (tc) is set when DMA count loops to 0xFFFF.
* Request status is set when DMA has data to transfer
* (ignored in auto-init DMA).
*/
VOID
SetDMAStatus(
BOOL requesting,
BOOL tc
)
{
VDD_DMA_INFO dMAInfo;
if (VDDQueryDMA((HANDLE)GlobalHInstance, SB_DMA_CHANNEL, &dMAInfo)) {
dprintf4(("DMA Info : addr %4X, count %4X, page %4X, status %2X, mode %2X, mask %2X",
dMAInfo.addr, dMAInfo.count, dMAInfo.page, dMAInfo.status,
dMAInfo.mode, dMAInfo.mask));
if (requesting) {
dMAInfo.status |= (0x10 << SB_DMA_CHANNEL); // Requesting
dprintf3(("DMA set as requesting"));
} else {
dMAInfo.status &= ~(0x10 << SB_DMA_CHANNEL); // Not Requesting
dprintf3(("DMA set as not requesting"));
}
if (tc) {
dMAInfo.status |= (1 << SB_DMA_CHANNEL); // tc reached
dprintf3(("DMA set as terminal count reached"));
} else {
dMAInfo.status &= ~(1 << SB_DMA_CHANNEL); // tc not reached
dprintf3(("DMA set as terminal count not reached"));
}
VDDSetDMA((HANDLE)GlobalHInstance, SB_DMA_CHANNEL, VDD_DMA_STATUS,
&dMAInfo);
}
else {
dprintf1(("Could not retrieve DMA Info"));
}
}
/***************************************************************************/
/*
* Start an auto wave.
* Returns TRUE on success.
*/
BOOL
StartAutoWave(
VOID
)
{
HANDLE tHandle; // handle to auto thread
VDD_DMA_INFO dMAInfo;
ULONG i;
DWORD id;
dprintf2(("Starting auto wave"));
StopSingleWave(TRUE);
DspMode = Auto;
// Open device
SetWaveFormat();
if (!OpenWaveDevice()) {
dprintf1(("Can't open wave device", GetLastError()));
return FALSE;
}
if(!(tHandle = CreateThread(NULL, 0, AutoThreadEntry, NULL,
CREATE_SUSPENDED, &id))) {
dprintf1(("Create auto thread failed code %d", GetLastError()));
return FALSE;
} else {
if(!SetThreadPriority(tHandle, THREAD_PRIORITY_HIGHEST)) {
dprintf1(("Unable to set auto thread priority"));
}
}
ResumeThread(tHandle);
CloseHandle(tHandle);
WaitForSingleObject(ThreadStarted, INFINITE);
return TRUE;
}
/***************************************************************************/
/*
* Stop Auto thread,
* Should always be called with TRUE,
* except if process exiting as wait causes deadlock
*/
VOID
StopAutoWave(
BOOL wait
)
{
if(bDspActive && (DspMode == Auto)) {
dprintf2(("Stopping auto init"));
InterlockedExchange(&bDspReset, TRUE);
if(wait) {
dprintf2(("Waiting for auto thread to exit"));
WaitForSingleObject(ThreadFinished, INFINITE);
dprintf2(("Auto thread has exited"));
}
}
}
/***************************************************************************/
/*
* Start a single cycle wave.
* Returns TRUE on success.
*/
BOOL
StartSingleWave(
VOID
)
{
HANDLE tHandle; // handle to single thread
DWORD id;
ULONG i;
StopAutoWave(TRUE);
DspMode = Single;
if(!bDspActive) {
dprintf2(("Starting single cycle wave"));
if(!(tHandle = CreateThread(NULL, 0, SingleThreadEntry, NULL,
CREATE_SUSPENDED, &id))) {
dprintf1(("Create single cycle thread failed code %d", GetLastError()));
return FALSE;
} else {
// set synchronization events to a known state
InterlockedExchange(&bDspActive, TRUE);
InterlockedExchange(&bDspPause, FALSE);
InterlockedExchange(&bDspReset, FALSE);
CloseHandle(SingleWaveSem);
SingleWaveSem=CreateSemaphore(NULL, 1, 100, NULL);
if(!SetThreadPriority(tHandle, THREAD_PRIORITY_HIGHEST)) {
dprintf1(("Unable to set thread priority"));
}
ResumeThread(tHandle);
CloseHandle(tHandle);
WaitForSingleObject(ThreadStarted, INFINITE);
return TRUE;
}
} else {
ContinueDMA(); // if app has paused dma
ReleaseSemaphore(SingleWaveSem, 1, NULL); // new buffer to be written
return TRUE;
}
Sleep(500);
}
/***************************************************************************/
/*
* Stop single cycle thread,
* Should always be called with TRUE,
* except if process exiting as wait causes deadlock.
*/
VOID
StopSingleWave(
BOOL wait
)
{
if(bDspActive && (DspMode == Single)) {
dprintf2(("Stopping single wave"));
InterlockedExchange(&bDspReset, TRUE);
ContinueDMA(); // if app has paused DMA
ReleaseSemaphore(SingleWaveSem, 1, NULL);
if(wait) {
dprintf2(("Waiting for single thread to exit"));
WaitForSingleObject(ThreadFinished, INFINITE);
dprintf2(("Single thread has exited"));
}
}
}
/***************************************************************************/
/*
* GetWaveOutPosition
*/
BOOL
GetWaveOutPosition(
PULONG pPos
)
{
MMTIME mmTime;
mmTime.wType = TIME_BYTES;
if (MMSYSERR_NOERROR == GetPositionProc(HWaveOut, &mmTime, sizeof(MMTIME))) {
VDM_TRACE(0x640, 0x640, mmTime.u.cb);
*pPos = mmTime.u.cb;
return TRUE;
}
return FALSE;
}
VOID
WaitOnWaveOutIdle(
VOID
)
{
ULONG LastBytesPlayedValue = 0;
ULONG PhysicalBytesPlayed;
//
// Allow the device to finish playing current sounds before nuking buffers
//
while(GetWaveOutPosition(&PhysicalBytesPlayed)) {
if (LastBytesPlayedValue == PhysicalBytesPlayed) {
break; // no sounds are playing
}
LastBytesPlayedValue = PhysicalBytesPlayed;
Sleep(1);
}
}
/***************************************************************************/
/*
* WriteBurst
*/
BOOL
WriteBurst(
WAVEHDR * WaveHdr
)
{
MMRESULT mmResult;
// Copy data to current buffer
dprintf3(("Copying data to buffer %8X from %4X", WaveHdr->lpData,
dMACurrentPosition));
RtlCopyMemory(WaveHdr->lpData,
(CONST VOID *)dMACurrentPosition,
WaveHdr->dwBufferLength);
dMACurrentPosition += WaveHdr->dwBufferLength;
// Update virtual DMA status
dMAInfo.count = (WORD)(dMASize - (dMACurrentPosition-dMAPhysicalStart));
dMAInfo.addr = (WORD)(dMAVirtualStart +
(dMACurrentPosition-dMAPhysicalStart));
dprintf3(("Updated Dma Position = %4X, count = %4X", dMAInfo.addr,
dMAInfo.count));
VDDSetDMA((HANDLE)GlobalHInstance, SB_DMA_CHANNEL,
VDD_DMA_COUNT|VDD_DMA_ADDR, &dMAInfo);
if(dMACurrentPosition >= dMAPhysicalStart+dMASize) {
// looped in DMA buffer
dMACurrentPosition = dMAPhysicalStart;
}
// Actually write the data
VDM_TRACE(0x603, (USHORT)WaveHdr->dwBufferLength, (ULONG)WaveHdr);
mmResult = WriteProc(HWaveOut, WaveHdr, sizeof(WAVEHDR));
return (mmResult == MMSYSERR_NOERROR);
}
/***************************************************************************/
/*
* GenerateHdrs
* Build an array of MM wavehdrs and corresponding buffers
*/
#define AUTO TRUE
#define SINGLE FALSE
BOOL
GenerateHdrs(
BOOL bAuto
)
{
static ULONG committedMemorySize = 0;
ULONG DesiredCommit;
ULONG BurstBufferSize;
ULONG BlocksPerGroup = 1;
ULONG NumberOfGroups = 1;
ULONG BurstSize; // minimum(AUTO_BLOCK_SIZE, SBBLockSize+1)
ULONG lastBurst = 0; // the size of the last buffer
BYTE *pDataInit;
ULONG i;
if(AUTO_BLOCK_SIZE > SBBlockSize+1) { // block size is no > than SBBlockSize+1
BurstSize = SBBlockSize+1;
} else {
BurstSize = AUTO_BLOCK_SIZE;
}
DesiredBytesOutstanding = LookAheadFactor;
BurstsPerBlock = (SBBlockSize+1)/BurstSize;
BurstBufferSize = BurstsPerBlock*BurstSize;
if((lastBurst = (SBBlockSize+1)%BurstSize) > 0 ) {
BurstsPerBlock++;
BurstBufferSize+=lastBurst;
}
BlocksPerGroup = (dMASize+1)/(SBBlockSize+1);
if ((dMASize+1)%(SBBlockSize+1)) {
dprintf2(("Error: SB block size not an integral factor of DMA size"));
return FALSE;
}
NumberOfGroups = MAX_WAVE_BYTES / (dMASize+1);
if (!NumberOfGroups) {
NumberOfGroups = 1;
}
TotalNumberOfBursts = NumberOfGroups * BlocksPerGroup * BurstsPerBlock;
//
// Make sure the # of wavehdrs doesn't get out of hand
//
while((TotalNumberOfBursts > 256) && (NumberOfGroups > 1)) {
NumberOfGroups /= 2;
TotalNumberOfBursts = NumberOfGroups * BlocksPerGroup * BurstsPerBlock;
}
BurstBufferSize *= NumberOfGroups * BlocksPerGroup;
dprintf2(("%d groups of %d blocks of %d bursts of size %X, remainder burst=%X", NumberOfGroups, BlocksPerGroup, BurstsPerBlock, BurstSize, lastBurst));
DesiredCommit = ((BurstBufferSize+PageSize-1)/PageSize)*PageSize;
dprintf2(("Total burst buffer size is %X bytes, rounding to %X", BurstBufferSize, DesiredCommit));
if (DesiredCommit > committedMemorySize) {
if (!VirtualAlloc(WaveData+committedMemorySize,
DesiredCommit-committedMemorySize,
MEM_COMMIT,
PAGE_READWRITE)) {
dprintf1(("Unable to commit memory"));
return(FALSE);
}
committedMemorySize = DesiredCommit;
} else if (DesiredCommit < committedMemorySize) {
if (VirtualFree(WaveData+DesiredCommit,
committedMemorySize-DesiredCommit,
MEM_DECOMMIT)) {
committedMemorySize = DesiredCommit;
} else {
dprintf1(("Unable to decommit memory"));
}
}
// malloc autoWaveHdrs
WaveHdrs = (WAVEHDR *) VirtualAlloc(NULL,
TotalNumberOfBursts*sizeof(WAVEHDR),
MEM_RESERVE | MEM_COMMIT,
PAGE_READWRITE);
if(WaveHdrs == NULL) {
dprintf1(("Unable to allocate memory"));
return(FALSE);
}
//
// Prepare autoWaveHdrs
//
pDataInit = WaveData;
for (i=0; i<TotalNumberOfBursts; i++) {
if ((!lastBurst) || ((i+1) % BurstsPerBlock)) {
WaveHdrs[i].dwBufferLength = BurstSize;
} else {
WaveHdrs[i].dwBufferLength = lastBurst;
}
WaveHdrs[i].lpData = pDataInit;
WaveHdrs[i].dwFlags = 0;
PrepareHeaderProc(HWaveOut, &WaveHdrs[i], sizeof(WAVEHDR));
pDataInit = (BYTE *) ((ULONG)pDataInit + WaveHdrs[i].dwBufferLength);
BurstBufferSize += WaveHdrs[i].dwBufferLength;
}
//
// Initialize iHdr for DspProcessBlock
//
iHdr = TotalNumberOfBursts-1;
return TRUE;
}
/***************************************************************************/
/*
* ProcessBlock
* Process a single block of data as defined by the SB block transfer size
*/
VOID
DspProcessBlock(
VOID
)
{
ULONG i;
// Write the data, keeping DMA status current
for (i=0; i<BurstsPerBlock; i++) {
//
// Make sure we aren't getting too far ahead
//
if (BytesOutstanding > (PhysicalBytesPlayed + DesiredBytesOutstanding)) {
LastBytesPlayedValue = 0;
while(1) {
if (!GetWaveOutPosition(&PhysicalBytesPlayed)) {
break; // ERROR
}
if (BytesOutstanding <= (PhysicalBytesPlayed + DesiredBytesOutstanding)) {
break;
}
if (LastBytesPlayedValue == PhysicalBytesPlayed) {
break; // no sounds are playing
}
LastBytesPlayedValue = PhysicalBytesPlayed;
Sleep(1);
}
}
//
// Queue next buffer
//
iHdr = (iHdr+1)%TotalNumberOfBursts;
VDM_TRACE(0x601, (USHORT)iHdr, TotalNumberOfBursts);
VDM_TRACE(0x602, (USHORT)iHdr, dMACurrentPosition);
if (WriteBurst(&WaveHdrs[iHdr])) {
BytesOutstanding += WaveHdrs[iHdr].dwBufferLength;
VDM_TRACE(0x604, (USHORT)iHdr, BytesOutstanding);
} else {
VDM_TRACE(0x684, (USHORT)iHdr, BytesOutstanding);
}
// Check if we should pause
if(bDspPause) {
dprintf3(("Waiting for paused event"));
WaitForSingleObject(PauseEvent, INFINITE);
dprintf3(("Paused event received"));
InterlockedExchange(&bDspPause, 0);
}
// Check if we should keep going
if(bDspReset) {
return;
}
}
// Check if we should keep going
if(bDspReset) {
return;
}
// Generate interrupt
if(dMAInfo.count==0xFFFF) { // end of DMA buffer
SetDMAStatus(FALSE, TRUE);
}
VDM_TRACE(0x6a3,0,0);
GenerateInterrupt();
//
// This sleep gives the app thread some time to catch up with the interrupt.
// Granted this is an inexact method for doing this, but it empirically
// seems to be good enough for most apps.
//
Sleep(1);
if(dMAInfo.count==0xFFFF) { // end of DMA buffer
SetDMAStatus(FALSE, FALSE);
}
}
/***************************************************************************/
/*
* Auto-init DMA thread.
*/
DWORD WINAPI
AutoThreadEntry(
LPVOID context
)
{
ULONG i;
dprintf2(("Auto thread starting"));
VDM_TRACE(0x600, 0, 0);
bDspActive = TRUE;
SetEvent(ThreadStarted);
//
// Initialize DMA information
//
VDDQueryDMA((HANDLE)GlobalHInstance, SB_DMA_CHANNEL, &dMAInfo);
dMAVirtualStart = dMAInfo.addr;
dMASize = dMAInfo.count;
if((dMAPhysicalStart=GetDMATransferAddress()) == -1L) {
dprintf1(("Unable to get dma address"));
return(FALSE);
}
dprintf2(("DMA Physical Start is %4X, DMA size is %4X", dMAPhysicalStart,
dMASize));
dMACurrentPosition = dMAPhysicalStart;
SetDMAStatus(FALSE, FALSE);
//
// Calculate NumberOfBursts in the current run
//
if (!GenerateHdrs(AUTO)) {
return FALSE;
}
//
// Start looping on the buffer
//
while(!bDspReset) {
DspProcessBlock();
}
WaitOnWaveOutIdle();
//
// Reset and close the device
//
CloseWaveDevice();
// Clean up hdrs and events
for(i=0; (ULONG)i<TotalNumberOfBursts; i++) {
UnprepareHeaderProc(HWaveOut, &WaveHdrs[i], sizeof(WAVEHDR));
}
// Clean up memory
VirtualFree(WaveHdrs, 0, MEM_RELEASE);
bDspActive = FALSE;
SetEvent(ThreadFinished);
dprintf2(("Auto thread exiting"));
return(0);
}
/***************************************************************************/
/*
* Single cycle DMA thread.
*/
DWORD WINAPI
SingleThreadEntry(
LPVOID context
)
{
ULONG LastSBBlockSize = 0;
BOOL BlockSizeChanged; // set to TRUE if Size has changed
BOOL WaveFormatChanged;
BOOL HdrsInvalid = TRUE;
ULONG i;
dprintf2(("Single cycle thread starting"));
bDspActive = TRUE;
SetEvent(ThreadStarted);
while (!bDspReset) {
// Wait until app wants to transfer more data
dprintf3(("Waiting for single wave semaphore"));
WaitForSingleObject(SingleWaveSem, INFINITE);
dprintf3(("Single wave semaphore received"));
// Check if we should pause
if(bDspPause) {
dprintf3(("Waiting for paused event"));
WaitForSingleObject(PauseEvent, INFINITE);
dprintf3(("Paused event received"));
InterlockedExchange(&bDspPause, 0);
}
// Check if we should keep going
if(bDspReset) {
break; // break out of loop
}
// Initialize for this run
VDDQueryDMA((HANDLE)GlobalHInstance, SB_DMA_CHANNEL, &dMAInfo);
dprintf4(("DMA Info : addr %4X, count %4X, page %4X, status %2X, mode %2X, mask %2X",
dMAInfo.addr, dMAInfo.count, dMAInfo.page, dMAInfo.status,
dMAInfo.mode, dMAInfo.mask));
dMAVirtualStart = dMAInfo.addr;
dMASize = dMAInfo.count;
if(dMAInfo.count == 0xFFFF || dMAInfo.count == 0) {
continue; // next iteration of loop, app doesn't have data to transfer
}
if ((dMAPhysicalStart = GetDMATransferAddress()) == -1L) {
dprintf1(("Unable to get transfer address"));
continue; // next iteration of loop
}
dprintf3(("DMA Physical Start is %4X, DMA size is %4X",
dMAPhysicalStart, dMASize));
dMACurrentPosition = dMAPhysicalStart;
if(LastSBBlockSize != SBBlockSize) {
LastSBBlockSize = SBBlockSize;
BlockSizeChanged = TRUE;
} else {
BlockSizeChanged = FALSE;
}
WaveFormatChanged = SetWaveFormat();
// If we're changing our device
if ((WaveFormatChanged || BlockSizeChanged) && (HWaveOut != NULL)) {
dprintf3(("Single-Cycle Parameters changed"));
WaitOnWaveOutIdle();
HdrsInvalid = TRUE;
for(i=0; (ULONG)i<TotalNumberOfBursts; i++) {
UnprepareHeaderProc(HWaveOut, &WaveHdrs[i], sizeof(WAVEHDR));
}
VirtualFree(WaveHdrs, 0, MEM_RELEASE);
if (WaveFormatChanged) {
CloseWaveDevice();
}
}
if (HWaveOut == NULL) {
OpenWaveDevice();
}
if (HdrsInvalid) {
if (GenerateHdrs(SINGLE)) {
HdrsInvalid = FALSE;
} else {
return FALSE;
}
}
// show dma as requesting
SetDMAStatus(TRUE, FALSE);
DspProcessBlock();
}
WaitOnWaveOutIdle();
//
// Reset and close the device
//
CloseWaveDevice();
// Clean up hdrs and events
for(i=0; (ULONG)i<TotalNumberOfBursts; i++) {
UnprepareHeaderProc(HWaveOut, &WaveHdrs[i], sizeof(WAVEHDR));
}
// Clean up memory
VirtualFree(WaveHdrs, 0, MEM_RELEASE);
bDspActive = FALSE;
SetEvent(ThreadFinished);
dprintf2(("Single cycle wave is exiting"));
return(0);
}
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