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Aggressively round up to the proper alignment when reporting position 

on streams where we are converting up.
This commit is contained in:
Jeremy White 2005-03-02 12:17:28 +00:00 committed by Alexandre Julliard
parent 2122277284
commit 36e845ce05
1 changed files with 51 additions and 6 deletions
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55
dlls/winmm/wavemap/wavemap.c
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@ -418,14 +418,59 @@ static DWORD wodUnprepare(WAVEMAPDATA* wom, LPWAVEHDR lpWaveHdrSrc, DWORD dwPara
static DWORD wodGetPosition(WAVEMAPDATA* wom, LPMMTIME lpTime, DWORD dwParam2)
{
DWORD val;
MMTIME timepos;
TRACE("(%p %p %08lx)\n", wom, lpTime, dwParam2);
val = waveOutGetPosition(wom->u.out.hInnerWave, lpTime, dwParam2);
if (lpTime->wType == TIME_BYTES)
lpTime->u.cb = MulDiv(lpTime->u.cb, wom->avgSpeedOuter, wom->avgSpeedInner);
if (lpTime->wType == TIME_SAMPLES)
lpTime->u.cb = MulDiv(lpTime->u.cb, wom->nSamplesPerSecOuter, wom->nSamplesPerSecInner);
memcpy(&timepos, lpTime, sizeof(timepos));
/* For TIME_MS, we're going to recalculate using TIME_BYTES */
if (lpTime->wType == TIME_MS)
timepos.wType = TIME_BYTES;
val = waveOutGetPosition(wom->u.out.hInnerWave, &timepos, dwParam2);
if (lpTime->wType == TIME_BYTES || lpTime->wType == TIME_MS)
{
DWORD dwInnerSamplesPerOuter = wom->nSamplesPerSecInner / wom->nSamplesPerSecOuter;
if (dwInnerSamplesPerOuter > 0)
{
DWORD dwInnerBytesPerSample = wom->avgSpeedInner / wom->nSamplesPerSecInner;
DWORD dwInnerBytesPerOuterSample = dwInnerBytesPerSample * dwInnerSamplesPerOuter;
DWORD remainder = 0;
/* If we are up sampling (going from lower sample rate to higher),
** we need to make a special accomodation for times when we've
** written a partial output sample. This happens frequently
** to us because we use msacm to do our up sampling, and it
** will up sample on an unaligned basis.
** For example, if you convert a 2 byte wide 8,000 'outer'
** buffer to a 2 byte wide 48,000 inner device, you would
** expect 2 bytes of input to produce 12 bytes of output.
** Instead, msacm will produce 8 bytes of output.
** But reporting our position as 1 byte of output is
** nonsensical; the output buffer position needs to be
** aligned on outer sample size, and aggressively rounded up.
*/
remainder = timepos.u.cb % dwInnerBytesPerOuterSample;
if (remainder > 0)
{
timepos.u.cb -= remainder;
timepos.u.cb += dwInnerBytesPerOuterSample;
}
}
lpTime->u.cb = MulDiv(timepos.u.cb, wom->avgSpeedOuter, wom->avgSpeedInner);
/* Once we have the TIME_BYTES right, we can easily convert to TIME_MS */
if (lpTime->wType == TIME_MS)
lpTime->u.cb = MulDiv(lpTime->u.cb, 1000, wom->avgSpeedOuter);
}
else if (lpTime->wType == TIME_SAMPLES)
lpTime->u.cb = MulDiv(timepos.u.cb, wom->nSamplesPerSecOuter, wom->nSamplesPerSecInner);
else
/* other time types don't require conversion */
lpTime->u = timepos.u;
return val;
}