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windows-server-2003/multimedia/media/avi/mciavi.16/avisound.c

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/******************************************************************************
Copyright (C) Microsoft Corporation 1991-1992. All rights reserved.
Title: avisound.c - Code for playing audio in AVI files.
*****************************************************************************/
#include "graphic.h"
#define AUDIO_PANIC 10
static UINT nAudioPanic;
//
// redefine StreamFromFOURCC to only handle 0-9 streams!
//
#undef StreamFromFOURCC
#define StreamFromFOURCC(fcc) (UINT)(HIBYTE(LOWORD(fcc)) - (BYTE)'0')
void FAR PASCAL _LOADDS mciaviWaveOutFunc(HWAVEOUT hWaveOut, UINT wMsg,
DWORD dwInstance, DWORD dwParam1, DWORD dwParam2);
#ifndef WIN32
#define GetDS() (HGLOBAL)HIWORD((DWORD)(LPVOID)&ghModule)
#endif //WIN16
DWORD FAR PASCAL SetUpAudio(NPMCIGRAPHIC npMCI, BOOL fPlaying)
{
UINT w;
LPWAVEHDR lpWaveHdr;
STREAMINFO *psi;
if (npMCI->nAudioStreams == 0) {
npMCI->wABs = 0;
npMCI->wABOptimal = 0;
return 0L;
}
nAudioPanic = GetProfileInt(TEXT("MCIAVI"), TEXT("AudioPanic"), AUDIO_PANIC);
psi = SI(npMCI->nAudioStream);
Assert(psi->sh.fccType == streamtypeAUDIO);
Assert(psi->cbFormat);
Assert(psi->lpFormat);
if (!npMCI->pWF) {
npMCI->pWF = (NPWAVEFORMAT)LocalAlloc(LPTR, (UINT)psi->cbFormat);
if (!npMCI->pWF) {
return MCIERR_OUT_OF_MEMORY;
}
}
hmemcpy(npMCI->pWF,psi->lpFormat,psi->cbFormat);
npMCI->wEarlyAudio = (UINT)psi->sh.dwInitialFrames;
npMCI->dwAudioLength = psi->sh.dwLength * psi->sh.dwSampleSize;
if (npMCI->dwAudioLength < 1000L) {
DPF(("AudioLength is bogus"));
npMCI->dwAudioLength = muldiv32((npMCI->pWF->nAvgBytesPerSec + 100) *
npMCI->lFrames,npMCI->dwMicroSecPerFrame,1000000L);
}
//
// choose the audio playback method depending on how we are going to
// recive audio data from the file.
//
switch (npMCI->wPlaybackAlg) {
case MCIAVI_ALG_HARDDISK:
case MCIAVI_ALG_AUDIOONLY:
if (!npMCI->pf && !npMCI->hmmioAudio) {
MMIOINFO mmioInfo;
_fmemset(&mmioInfo, 0, sizeof(MMIOINFO));
mmioInfo.htask = (HANDLE) npMCI->hCallingTask; //ntmmsystem bug, should be threadid which is dword
npMCI->hmmioAudio = mmioOpen(npMCI->szFilename, &mmioInfo,
MMIO_READ | MMIO_DENYWRITE);
if (npMCI->hmmioAudio == NULL)
npMCI->hmmioAudio = mmioOpen(npMCI->szFilename, &mmioInfo,
MMIO_READ);
if (!npMCI->hmmioAudio) {
Assert(0);
return MCIERR_DRIVER_INTERNAL;
}
}
// fall through to CDROM
case MCIAVI_ALG_CDROM:
//!!!! we need to tune this!!!!
// !!! We use four 1/2 second buffers. This is arbitrary.
npMCI->wABs = 4;
npMCI->wABOptimal = 0;
npMCI->dwABSize = npMCI->pWF->nAvgBytesPerSec / 2;
break;
case MCIAVI_ALG_INTERLEAVED:
/* Fix up some values based on the header information */
npMCI->dwABSize = muldiv32(npMCI->dwMicroSecPerFrame,
npMCI->pWF->nAvgBytesPerSec,1000000L) + 2047;
npMCI->dwABSize &= ~(2047L);
npMCI->wABs = npMCI->wEarlyAudio + 2 + (WORD) npMCI->dwBufferedVideo;
/* Soundblaster hack: waveoutdone only accurate to 2K. */
//!!!!!!!!!! is this right.
if (npMCI->dwMicroSecPerFrame) {
npMCI->wABOptimal = npMCI->wABs -
(UINT) (muldiv32(2048, 1, muldiv32(npMCI->dwMicroSecPerFrame,
npMCI->pWF->nAvgBytesPerSec,1000000L)));
} else {
npMCI->wABOptimal = 0;
}
//!!! hack so we can do burst reading, up to 1sec
//npMCI->wABs += (int)muldiv32(1000000l, 1, npMCI->dwMicroSecPerFrame);
DPF2(("Using %u audio buffers, of which %u should be full.\n", npMCI->wABs, npMCI->wABOptimal));
break;
default:
Assert(0);
return 0L;
}
npMCI->dwABSize -= npMCI->dwABSize % npMCI->pWF->nBlockAlign;
if (!fPlaying)
return 0L;
/* This code adjusts the wave format block to play
** the audio at the correct speed to match the frame rate.
*/
npMCI->pWF->nSamplesPerSec = muldiv32(npMCI->pWF->nSamplesPerSec,
npMCI->dwMicroSecPerFrame,
npMCI->dwPlayMicroSecPerFrame);
npMCI->pWF->nAvgBytesPerSec = muldiv32(npMCI->pWF->nAvgBytesPerSec,
npMCI->dwMicroSecPerFrame,
npMCI->dwPlayMicroSecPerFrame);
if (npMCI->pWF->wFormatTag == WAVE_FORMAT_PCM) {
/* Make sure this is exactly right... */
npMCI->pWF->nAvgBytesPerSec =
npMCI->pWF->nSamplesPerSec * npMCI->pWF->nBlockAlign;
}
/* Kill any currently playing sound */
sndPlaySound(NULL, 0);
DPF2(("Opening wave device....\n"));
/* Try to open a wave device. */
w = waveOutOpen(&npMCI->hWave, (UINT)WAVE_MAPPER,
(LPWAVEFORMATEX) npMCI->pWF,
//(const LPWAVEFORMATEX) npMCI->pWF,
(DWORD) &mciaviWaveOutFunc,
(DWORD) (LPMCIGRAPHIC) npMCI,
(DWORD)CALLBACK_FUNCTION);
if (w) {
DPF(("Unable to open wave device.\n"));
npMCI->hWave = NULL;
return w == WAVERR_BADFORMAT ?
MCIERR_WAVE_OUTPUTSUNSUITABLE :
MCIERR_WAVE_OUTPUTSINUSE;
}
npMCI->dwFlags &= ~MCIAVI_LOSTAUDIO;
#ifndef WIN32 // No need to lock it on NT - although we could with Virtual mem
// functions
//
// page lock our DS so our wave callback function can
// touch it without worry. see mciaviWaveOutFunc()
//
GlobalPageLock(GetDS());
#endif //WIN16
/* Pause the wave output device, so it won't start playing
** when we're loading up the buffers.
*/
if (waveOutPause(npMCI->hWave) != 0) {
DPF(("Error from waveOutPause!\n"));
return MCIERR_DRIVER_INTERNAL;
}
if (npMCI->dwFlags & MCIAVI_VOLUMESET) {
DeviceSetVolume(npMCI, npMCI->dwVolume);
} else {
DeviceGetVolume(npMCI);
}
npMCI->lpAudio = GlobalAllocPtr(GMEM_MOVEABLE | GMEM_SHARE,
npMCI->wABs * (npMCI->dwABSize + sizeof(WAVEHDR)));
if (!npMCI->lpAudio) {
return MCIERR_OUT_OF_MEMORY;
}
npMCI->dwAudioPlayed = 0L;
npMCI->wNextAB = 0;
npMCI->dwUsedThisAB = 0;
/* Allocate and prepare our buffers */
for (w = 0; w < npMCI->wABs; w++) {
lpWaveHdr = (LPWAVEHDR) (npMCI->lpAudio + (w * sizeof(WAVEHDR)));
lpWaveHdr->lpData = (HPSTR) npMCI->lpAudio +
npMCI->wABs * sizeof(WAVEHDR) +
w * npMCI->dwABSize;
lpWaveHdr->dwBufferLength = npMCI->dwABSize;
lpWaveHdr->dwBytesRecorded = 0L;
lpWaveHdr->dwUser = 0L;
lpWaveHdr->dwFlags = 0L;
lpWaveHdr->dwLoops = 0L;
lpWaveHdr->lpNext = 0L;
lpWaveHdr->reserved = 0;
}
for (w = 0; w < npMCI->wABs; w++) {
lpWaveHdr = (LPWAVEHDR) (npMCI->lpAudio + (w * sizeof(WAVEHDR)));
if (waveOutPrepareHeader(npMCI->hWave, lpWaveHdr, sizeof(WAVEHDR))
!= 0) {
return MCIERR_OUT_OF_MEMORY;
}
lpWaveHdr->dwFlags |= WHDR_DONE;
}
return 0L;
}
DWORD FAR PASCAL CleanUpAudio(NPMCIGRAPHIC npMCI)
{
UINT w;
/* Clear flags relating to playing audio */
npMCI->dwFlags &= ~(MCIAVI_WAVEPAUSED);
if (npMCI->lpAudio) {
waveOutRestart(npMCI->hWave); // just in case we are paused
waveOutReset(npMCI->hWave);
for (w = 0; w < npMCI->wABs; w++) {
LPWAVEHDR lpWaveHdr;
lpWaveHdr = (LPWAVEHDR) (npMCI->lpAudio
+ (w * sizeof(WAVEHDR)));
#if 0
lpWaveHdr->lpData = npMCI->lpAudio
+ npMCI->wABs * sizeof(WAVEHDR)
+ w * npMCI->dwABSize;
lpWaveHdr->dwBufferLength = npMCI->dwABSize;
#endif
/* Do we need to check for an error from this? */
waveOutUnprepareHeader(npMCI->hWave, lpWaveHdr,
sizeof(WAVEHDR));
}
GlobalFreePtr(npMCI->lpAudio);
npMCI->lpAudio = NULL;
Assert(npMCI->wABFull == 0);
}
DPF2(("Closing wave device.\n"));
waveOutClose(npMCI->hWave);
npMCI->hWave = 0;
#ifndef WIN32
GlobalPageUnlock(GetDS());
#endif //WIN16
return 0L;
}
BOOL NEAR PASCAL WaitForFreeAudioBuffer(NPMCIGRAPHIC npMCI, BOOL FAR *lpfHurry)
{
LPWAVEHDR lpWaveHdr;
lpWaveHdr = (LPWAVEHDR) (npMCI->lpAudio
+ (npMCI->wNextAB * sizeof(WAVEHDR)));
/* Use the number of full audio buffers to decide if we're behind. */
if (npMCI->wABFull < npMCI->wABOptimal) {
*lpfHurry = TRUE;
}
/* If all of the audio buffers are full, we have to wait. */
if (npMCI->wABFull == npMCI->wABs) {
DWORD time = timeGetTime();
#define AUDIO_WAIT_TIMEOUT 2000
DOUT2("waiting for audio buffer.");
// we better not wait if the device is not playing!
Assert(!(npMCI->dwFlags & MCIAVI_WAVEPAUSED));
#ifdef XDEBUG
GetAsyncKeyState(VK_ESCAPE);
GetAsyncKeyState(VK_F2);
GetAsyncKeyState(VK_F3);
GetAsyncKeyState(VK_F4);
#endif
while (npMCI->wABFull == npMCI->wABs) {
if (npMCI->dwFlags & MCIAVI_STOP)
return FALSE;
aviTaskYield();
//
// the "Fahrenheit VA Audio Wave Driver" may get confused
// if you call waveOutPause() and waveOutRestart() alot
// and it will stay paused no matter what you do, it has
// all our buffers and it still does not make any sound
// you can call waveOutRestart() until you are blue in
// the face, it will do nothing.
//
// so this is why this routine can time out, after waiting
// 2 seconds or so we just toss all the audio in the buffers
// and start over.
//
if (timeGetTime() - time > AUDIO_WAIT_TIMEOUT) {
DOUT("Gave up waiting, reseting wave device\n");
waveOutReset(npMCI->hWave);
break;
}
#ifdef XDEBUG
if (GetAsyncKeyState(VK_ESCAPE) & 0x0001) {
DPF(("STOPPED WAITING! wABFull = %d, wABs = %d\n", npMCI->wABFull,npMCI->wABs));
return FALSE;
}
if (GetAsyncKeyState(VK_F2) & 0x0001) {
DOUT("Trying waveOutRestart\n");
waveOutRestart(npMCI->hWave);
}
if (GetAsyncKeyState(VK_F3) & 0x0001) {
DOUT("Trying waveOutReset\n");
waveOutReset(npMCI->hWave);
}
if (GetAsyncKeyState(VK_F4) & 0x0001) {
int i,n;
for (i=n=0; i<(int)npMCI->wABs; i++) {
if (((LPWAVEHDR)npMCI->lpAudio)[i].dwFlags & WHDR_DONE) {
DPF(("Buffer #%d is done!\n", i));
n++;
}
else {
DPF(("Buffer #%d is not done\n", i));
}
}
if (n > 0)
DPF(("%d buffers are done but our callback did not get called!\n", n));
}
#endif
}
DOUT2("done\n");
}
/* Debugging check that wave has finished playing--should never happen */
Assert(lpWaveHdr->dwFlags & WHDR_DONE);
#if 0
lpWaveHdr->lpData = npMCI->lpAudio +
npMCI->wABs * sizeof(WAVEHDR) +
npMCI->wNextAB * npMCI->dwABSize;
#endif
return TRUE;
}
#ifndef WIN32
#pragma optimize("", off)
#endif
BOOL NEAR PASCAL ReadSomeAudio(NPMCIGRAPHIC npMCI, BYTE _huge * lpAudio,
DWORD dwStart, DWORD FAR * pdwLength)
{
DWORD dwIndex = 0;
DWORD ckidAudio;
DWORD dwAudioPos = 0L;
AVIINDEXENTRY far * lpIndexEntry;
Assert(npMCI->wPlaybackAlg == MCIAVI_ALG_HARDDISK ||
npMCI->wPlaybackAlg == MCIAVI_ALG_AUDIOONLY);
Assert(npMCI->hpIndex);
/*
** Figure out what type of chunk we're looking for,
*/
ckidAudio = MAKEAVICKID(cktypeWAVEbytes, npMCI->nAudioStream);
lpIndexEntry = (AVIINDEXENTRY FAR *) npMCI->hpIndex;
for (dwIndex = 0; dwIndex < npMCI->macIndex;
dwIndex++, ++((AVIINDEXENTRY _huge *) lpIndexEntry)) {
if (lpIndexEntry->ckid != ckidAudio)
continue;
if (dwAudioPos + lpIndexEntry->dwChunkLength > dwStart) {
DWORD dwLengthNow;
DWORD dwSeekTo;
dwLengthNow = lpIndexEntry->dwChunkLength;
dwSeekTo = lpIndexEntry->dwChunkOffset + 8;
if (dwAudioPos + dwLengthNow > dwStart + *pdwLength) {
/* Attempted optimization: If we've already read some
** data, and we can't read the next whole chunk, let's
** leave it for later.
*/
if (dwAudioPos > dwStart && (!(npMCI->dwFlags & MCIAVI_REVERSE)))
break;
dwLengthNow = dwStart + *pdwLength - dwAudioPos;
}
if (dwAudioPos < dwStart) {
dwLengthNow -= (dwStart - dwAudioPos);
dwSeekTo += (dwStart - dwAudioPos);
}
mmioSeek(npMCI->hmmioAudio, dwSeekTo, SEEK_SET);
if (mmioRead(npMCI->hmmioAudio, lpAudio, dwLengthNow)
!= (LONG) dwLengthNow) {
DPF(("Error reading audio data (%lx bytes at %lx)\n", dwLengthNow, dwSeekTo));
return FALSE;
}
lpAudio += dwLengthNow;
}
dwAudioPos += lpIndexEntry->dwChunkLength;
if (dwAudioPos >= dwStart + *pdwLength)
return TRUE;
}
if (dwAudioPos < dwStart)
*pdwLength = 0; // return FALSE?
else
*pdwLength = dwAudioPos - dwStart;
return TRUE;
}
#ifndef WIN32
#pragma optimize("", on)
#endif
BOOL NEAR PASCAL ReverseWaveBuffer(NPMCIGRAPHIC npMCI, LPWAVEHDR lpWaveHdr)
{
DWORD dwLeft = lpWaveHdr->dwBufferLength;
BYTE _huge *hp1;
BYTE _huge *hp2;
DWORD dwBlock = npMCI->pWF->nBlockAlign;
BYTE bTemp;
DWORD dw;
Assert(npMCI->dwFlags & MCIAVI_REVERSE);
Assert(npMCI->wPlaybackAlg == MCIAVI_ALG_HARDDISK ||
npMCI->wPlaybackAlg == MCIAVI_ALG_AUDIOONLY);
/* This routine doesn't like it when the data doesn't end on a
** block boundary, so make it so. This should never happen.
*/
Assert((dwLeft % dwBlock) == 0);
dwLeft -= dwLeft % dwBlock;
hp1 = lpWaveHdr->lpData;
hp2 = ((HPSTR) lpWaveHdr->lpData) + (dwLeft - dwBlock);
while ((LONG) dwLeft > (LONG) dwBlock) {
for (dw = 0; dw < dwBlock; dw++) {
bTemp = *hp1;
*hp1++ = *hp2;
*hp2++ = bTemp;
}
hp2 -= dwBlock * 2;
dwLeft -= dwBlock * 2;
}
return TRUE;
}
void FAR PASCAL BuildVolumeTable(NPMCIGRAPHIC npMCI)
{
int vol;
int i;
if (!npMCI->pWF || npMCI->pWF->wFormatTag != WAVE_FORMAT_PCM)
return;
if (((NPPCMWAVEFORMAT) npMCI->pWF)->wBitsPerSample != 8)
return;
vol = (LOWORD(npMCI->dwVolume) + HIWORD(npMCI->dwVolume)) / 2;
vol = (int) (((LONG) vol * 256) / 500);
if (!npMCI->pVolumeTable)
npMCI->pVolumeTable = (void *)LocalAlloc(LPTR, 256);
if (!npMCI->pVolumeTable)
return;
for (i = 0; i < 256; i++) {
npMCI->pVolumeTable[i] = (BYTE) min(255, max(0,
(int) ((((LONG) (i - 128) * vol) / 256) + 128)));
}
}
BOOL NEAR PASCAL AdjustVolume(NPMCIGRAPHIC npMCI, LPWAVEHDR lpWaveHdr)
{
DWORD dwLeft = lpWaveHdr->dwBufferLength;
BYTE FAR *pb;
if (npMCI->pWF->wFormatTag != WAVE_FORMAT_PCM)
return FALSE;
if (!npMCI->pVolumeTable)
return FALSE;
if (((NPPCMWAVEFORMAT)npMCI->pWF)->wBitsPerSample != 8)
return FALSE;
pb = lpWaveHdr->lpData;
#ifndef WIN32
if (OFFSETOF(pb) + dwLeft > 64l*1024) {
while (dwLeft--) {
*pb = npMCI->pVolumeTable[*pb];
((BYTE _huge *)pb)++;
}
}
else {
while ((int)dwLeft--)
*pb++ = npMCI->pVolumeTable[*pb];
}
#else
while ((int)dwLeft--)
*pb++ = npMCI->pVolumeTable[*pb];
#endif
return TRUE;
}
BOOL NEAR PASCAL PlaySomeAudio(NPMCIGRAPHIC npMCI, LPWAVEHDR lpWaveHdr)
{
if (npMCI->pVolumeTable)
AdjustVolume(npMCI, lpWaveHdr);
lpWaveHdr->dwFlags &= ~WHDR_DONE;
/* If we're playing and we've used all of our audio buffers, pause the
** wave device until we can fill more of them up.
**
** we need to be carefull not to do this on the last frame!!!
*/
if ((npMCI->wTaskState == TASKPLAYING) &&
!(npMCI->dwFlags & MCIAVI_WAVEPAUSED) &&
(npMCI->wABFull == 0 || npMCI->nAudioBehind > nAudioPanic)) {
if (npMCI->wABFull > 0) {
DPF(("Audio panic stop\n"));
} else {
DPF(("Audio queue empty; pausing wave device\n"));
}
//
// some audio cards dont like starving it confuses them
// it is kind of rude any way. we are going to cause a audio break
// anyway so if we lose a little bit of audio (a few frames or so)
// no one will even notice (any worse than the audio break)
//
if (npMCI->wABFull <= 1) {
DOUT("Trying audio hack!\n");
waveOutReset(npMCI->hWave);
}
++npMCI->dwAudioBreaks;
waveOutPause(npMCI->hWave);
ICDrawStop(npMCI->hicDraw);
npMCI->dwFlags |= MCIAVI_WAVEPAUSED;
}
if (waveOutWrite(npMCI->hWave, lpWaveHdr, sizeof(WAVEHDR)) != 0) {
DPF(("Error from waveOutWrite!\n"));
npMCI->dwTaskError = MCIERR_AVI_AUDIOERROR;
return FALSE;
} else {
++npMCI->wABFull;
/* Use the next wave buffer next time */
++npMCI->wNextAB;
if (npMCI->wNextAB == npMCI->wABs)
npMCI->wNextAB = 0;
npMCI->dwUsedThisAB = 0;
}
if (npMCI->wABFull < min(npMCI->wABOptimal, npMCI->wABFull/2))
npMCI->nAudioBehind++;
else
npMCI->nAudioBehind=0;
/* If we paused the wave device to let ourselves catch up, and
** we've caught up enough, restart the device.
*/
if ((npMCI->dwFlags & MCIAVI_WAVEPAUSED) &&
npMCI->wTaskState == TASKPLAYING &&
npMCI->wABFull == npMCI->wABs) {
DPF2(("restarting wave device\n"));
waveOutRestart(npMCI->hWave);
ICDrawStart(npMCI->hicDraw);
npMCI->dwFlags &= ~(MCIAVI_WAVEPAUSED);
npMCI->nAudioBehind = 0;
}
return TRUE;
}
/* Play the current record's audio */
BOOL NEAR PASCAL PlayRecordAudio(NPMCIGRAPHIC npMCI, BOOL FAR *pfHurryUp,
BOOL FAR *pfPlayedAudio)
{
LPWAVEHDR lpWaveHdr;
FOURCC ckid;
DWORD cksize;
LPSTR lpSave;
LPSTR lpData;
BOOL fRet = TRUE;
////BOOL fSilence;
LONG len;
DWORD dwBytesTotal = 0L;
DWORD dwBytesThisChunk;
Assert(npMCI->wPlaybackAlg == MCIAVI_ALG_INTERLEAVED);
lpSave = npMCI->lp;
lpWaveHdr = ((LPWAVEHDR)npMCI->lpAudio) + npMCI->wNextAB;
*pfPlayedAudio = FALSE;
/* Remember!
**
** In the new file format, things shouldn't necessarily need to
** be ordered with the wave stuff always first.
*/
len = (LONG)npMCI->dwThisRecordSize;
while (len > 3 * sizeof(DWORD)) {
/* Look at the next chunk */
ckid = GET_DWORD();
cksize = GET_DWORD();
lpData = npMCI->lp;
len -= ((cksize + 1) & ~1) + 8;
SKIP_BYTES((cksize + 1) & ~1);
if (StreamFromFOURCC(ckid) != (UINT)npMCI->nAudioStream)
continue;
dwBytesThisChunk = cksize;
if (!dwBytesTotal) {
if (!WaitForFreeAudioBuffer(npMCI, pfHurryUp))
/* We had to stop waiting--the stop flag was probably set. */
goto exit;
}
if (dwBytesThisChunk > npMCI->dwABSize - dwBytesTotal) {
DPF(("Audio Record is too big!\n"));
dwBytesThisChunk = npMCI->dwABSize - dwBytesTotal;
}
hmemcpy((BYTE _huge *)lpWaveHdr->lpData + dwBytesTotal,
lpData, dwBytesThisChunk);
dwBytesTotal += dwBytesThisChunk;
}
if (dwBytesTotal) {
*pfPlayedAudio = TRUE;
lpWaveHdr->dwBufferLength = dwBytesTotal;
fRet = PlaySomeAudio(npMCI, lpWaveHdr);
}
/* Use the number of full audio buffers to decide if we're behind. */
if (npMCI->wABFull >= npMCI->wABOptimal) {
*pfHurryUp = FALSE;
}
exit:
npMCI->lp = lpSave;
return fRet;
}
/* For "preload audio" or "random access audio" modes, do what needs
** to be done to keep our buffers full.
*/
BOOL NEAR PASCAL KeepPlayingAudio(NPMCIGRAPHIC npMCI)
{
LPWAVEHDR lpWaveHdr;
DWORD dwBytesTotal = 0L;
LONG lNewAudioPos;
////BOOL fFirstTime = TRUE;
Assert(npMCI->wPlaybackAlg == MCIAVI_ALG_HARDDISK ||
npMCI->wPlaybackAlg == MCIAVI_ALG_AUDIOONLY);
PlayMore:
lpWaveHdr = ((LPWAVEHDR)npMCI->lpAudio) + npMCI->wNextAB;
if (npMCI->dwFlags & MCIAVI_REVERSE) {
lNewAudioPos = npMCI->dwAudioPos - npMCI->dwABSize;
if (lNewAudioPos < 0)
lNewAudioPos = 0;
dwBytesTotal = npMCI->dwAudioPos - lNewAudioPos;
} else {
lNewAudioPos = npMCI->dwAudioPos + npMCI->dwABSize;
if (lNewAudioPos > (LONG) npMCI->dwAudioLength)
lNewAudioPos = npMCI->dwAudioLength;
dwBytesTotal = lNewAudioPos - npMCI->dwAudioPos;
}
if (dwBytesTotal == 0) {
if (npMCI->dwFlags & MCIAVI_WAVEPAUSED) {
DOUT("no more audio to play, restarting wave device\n");
waveOutRestart(npMCI->hWave);
ICDrawStart(npMCI->hicDraw);
npMCI->dwFlags &= ~(MCIAVI_WAVEPAUSED);
npMCI->nAudioBehind = 0;
}
return TRUE;
}
/* If all of the audio buffers are full, we have nothing to do */
if (npMCI->wABFull == npMCI->wABs)
return TRUE;
#if 0
//!!!! Should we be yielding at all in here?
//!!! NO NO! not if updating!!!!
if (!fFirstTime) {
aviTaskYield();
}
fFirstTime = FALSE;
#endif
if (npMCI->dwFlags & MCIAVI_REVERSE)
npMCI->dwAudioPos = lNewAudioPos;
#ifdef USEAVIFILE
if (npMCI->pf) {
LONG lPos;
LONG lLength;
lPos = npMCI->dwAudioPos / SH(npMCI->nAudioStream).dwSampleSize;
lLength = dwBytesTotal / SH(npMCI->nAudioStream).dwSampleSize;
AVIStreamRead(SI(npMCI->nAudioStream)->ps,
lPos, lLength,
lpWaveHdr->lpData,
npMCI->dwABSize,
NULL, NULL);
}
else
#endif
{
if (!ReadSomeAudio(npMCI, lpWaveHdr->lpData,
npMCI->dwAudioPos,
&dwBytesTotal))
return FALSE;
if (dwBytesTotal == 0)
return TRUE;
}
if (!(npMCI->dwFlags & MCIAVI_REVERSE))
npMCI->dwAudioPos += dwBytesTotal;
lpWaveHdr->dwBufferLength = dwBytesTotal;
if (npMCI->dwFlags & MCIAVI_REVERSE) {
ReverseWaveBuffer(npMCI, lpWaveHdr);
}
if (!PlaySomeAudio(npMCI, lpWaveHdr))
return FALSE;
// return TRUE;
goto PlayMore;
}
/* Play the current chunk's audio */
BOOL NEAR PASCAL HandleAudioChunk(NPMCIGRAPHIC npMCI)
{
LPWAVEHDR lpWaveHdr;
FOURCC ckid;
DWORD cksize;
BYTE _huge *lpData;
BOOL fRet = TRUE;
BOOL fSilence;
DWORD dwBytesTotal = 0L;
DWORD dwBytesThisChunk;
DWORD dwBytesThisBuffer;
BOOL fHurryUp;
Assert(npMCI->wPlaybackAlg == MCIAVI_ALG_CDROM);
while ((DWORD) (npMCI->lp - npMCI->lpBuffer)
< npMCI->dwThisRecordSize - 3 * sizeof(DWORD)) {
/* Look at the next chunk */
ckid = GET_DWORD();
cksize = GET_DWORD();
lpData = npMCI->lp;
SKIP_BYTES(cksize + (cksize & 1));
fSilence = (TWOCCFromFOURCC(ckid) == cktypeWAVEsilence);
if (fSilence) {
if (cksize != sizeof(DWORD)) {
DPF(("Wave silence chunk of bad length!\n"));
fRet = FALSE;
npMCI->dwTaskError = MCIERR_INVALID_FILE;
goto exit;
}
dwBytesThisChunk = PEEK_DWORD();
} else {
dwBytesThisChunk = cksize;
}
while (dwBytesThisChunk > 0) {
lpWaveHdr = ((LPWAVEHDR)npMCI->lpAudio) + npMCI->wNextAB;
if (!WaitForFreeAudioBuffer(npMCI, &fHurryUp))
/* We had to stop waiting--the stop flag was probably set. */
goto exit;
dwBytesThisBuffer = min(dwBytesThisChunk,
npMCI->dwABSize - npMCI->dwUsedThisAB);
if (!fSilence) {
/* Move the data into the buffer */
hmemcpy((BYTE _huge *) lpWaveHdr->lpData + npMCI->dwUsedThisAB,
lpData,
dwBytesThisBuffer);
lpData += dwBytesThisBuffer;
} else {
/* Fill the buffer with silence */
/* This isn't right for 16-bit! */
#ifndef WIN32
#pragma message("WAVE silence chunks don't work right now.")
#endif
// fmemfill((BYTE _huge *)lpWaveHdr->lpData + npMCI->dwUsedThisAB,
// dwBytesThisBuffer, 0x80);
}
dwBytesThisChunk -= dwBytesThisBuffer;
npMCI->dwUsedThisAB += dwBytesThisBuffer;
// if (npMCI->dwUsedThisAB == npMCI->dwABSize) {
lpWaveHdr->dwBufferLength = npMCI->dwUsedThisAB;
fRet = PlaySomeAudio(npMCI, lpWaveHdr);
// }
}
}
exit:
return fRet;
}
/******************************************************************************
*****************************************************************************/
/***************************************************************************
*
* @doc INTERNAL MCIAVI
*
* @api BOOL | StealWaveDevice | steal the audio device from another
* instance of MCIAVI.
*
* @parm NPMCIGRAPHIC | npMCI | near ptr to the instance data
*
***************************************************************************/
BOOL FAR PASCAL StealWaveDevice(NPMCIGRAPHIC npMCI)
{
extern NPMCIGRAPHIC npMCIList; // in graphic.c
NPMCIGRAPHIC np;
Assert(npMCI->hWave == NULL);
DPF(("StealWaveDevice '%s' hTask=%04X\n", (LPSTR)npMCI->szFilename, GetCurrentTask()));
//
// walk the list of open MCIAVI instances and find one that
// will give up the wave device
//
for (np=npMCIList; np; np = np->npMCINext) {
if (np->hWave) {
DPF(("**** Stealing the wave device from '%s'.\n", (LPSTR)np->szFilename));
//!!!should we call DeviceMute() or just call cleanup audio?
//
//!!!can this cause evil reenter cases?
//
//!!!we are calling this from another task, will this work ok?
//!!!even in WIN32? mabey we should use SendMessage()
#if 1
SendMessage(np->hwndDefault, WM_AUDIO_OFF, 0, 0);
#else
np->dwFlags |= MCIAVI_LOSTAUDIO;
DeviceMute(np, TRUE);
np->dwFlags |= MCIAVI_LOSTAUDIO;
#endif
return TRUE;
}
}
DPF(("StealWaveDevice can't find a device to steal\n"));
return FALSE;
}
/***************************************************************************
*
* @doc INTERNAL MCIAVI
*
* @api BOOL | GiveWaveDevice | give away the audio device
* instance of MCIAVI.
*
* @parm NPMCIGRAPHIC | npMCI | near ptr to the instance data
*
***************************************************************************/
BOOL FAR PASCAL GiveWaveDevice(NPMCIGRAPHIC npMCI)
{
extern NPMCIGRAPHIC npMCIList; // in graphic.c
NPMCIGRAPHIC np;
Assert(npMCI->hWave == NULL);
DPF(("GiveWaveDevice '%s' hTask=%04X\n", (LPSTR)npMCI->szFilename, GetCurrentTask()));
//
// walk the list of open MCIAVI instances and find one that
// will give up the wave device
//
for (np=npMCIList; np; np = np->npMCINext) {
if (np->dwFlags & MCIAVI_LOSTAUDIO) {
DPF(("**** Giving the wave device to '%s'.\n", (LPSTR)np->szFilename));
PostMessage(np->hwndDefault, WM_AUDIO_ON, 0, 0);
return TRUE;
}
}
return FALSE;
}
#ifndef WIN32
#pragma alloc_text(FIX, mciaviWaveOutFunc)
#pragma optimize("", off)
#endif
void FAR PASCAL _LOADDS mciaviWaveOutFunc(HWAVEOUT hWaveOut, UINT wMsg,
DWORD dwInstance, DWORD dwParam1, DWORD dwParam2)
{
NPMCIGRAPHIC npMCI;
LPWAVEHDR lpwh;
#ifndef WIN32
#ifndef WANT_286
// If compiling -G3 we need to save the 386 registers
_asm _emit 0x66 ; pushad
_asm _emit 0x60
#endif
#endif
npMCI = (NPMCIGRAPHIC)(UINT)dwInstance;
lpwh = (LPWAVEHDR) dwParam1;
switch(wMsg) {
case MM_WOM_DONE:
npMCI->wABFull--;
npMCI->dwAudioPlayed += lpwh->dwBufferLength;
npMCI->dwTimingStart = timeGetTime();
break;
}
#ifndef WIN32
#ifndef WANT_286
// If compiling -G3 we need to restore the 386 registers
_asm _emit 0x66 ; popad
_asm _emit 0x61
#endif
#endif
}
#ifndef WIN32
#pragma optimize("", off)
#endif