static LPVOID AVIFILE_ReadFrame(IAVIEditStreamImpl* const This,
PAVISTREAM pstream, LONG pos)
{
PGETFRAME pg;
TRACE("(%p,%p,%d)\n",This,pstream,pos);
if (pstream == NULL)
return NULL;
/* if stream changes make sure that only palette changes */
if (This->pCurStream != pstream) {
pg = AVIStreamGetFrameOpen(pstream, NULL);
if (pg == NULL)
return NULL;
if (This->pg != NULL) {
if (IGetFrame_SetFormat(pg, This->lpFrame, NULL, 0, 0, -1, -1) != S_OK) {
AVIStreamGetFrameClose(pg);
ERR(": IGetFrame_SetFormat failed\n");
return NULL;
}
AVIStreamGetFrameClose(This->pg);
}
This->pg = pg;
This->pCurStream = pstream;
}
/* now get the decompressed frame */
This->lpFrame = AVIStreamGetFrame(This->pg, pos);
if (This->lpFrame != NULL)
This->sInfo.dwSuggestedBufferSize = This->lpFrame->biSizeImage;
return This->lpFrame;
}
static LPVOID WINAPI IGetFrame_fnGetFrame(IGetFrame *iface, LONG lPos)
{
IGetFrameImpl *This = impl_from_IGetFrame(iface);
LONG readBytes;
LONG readSamples;
TRACE("(%p,%d)\n", iface, lPos);
/* We don't want negative start values! -- marks invalid buffer content */
if (lPos < 0)
return NULL;
/* check state */
if (This->pStream == NULL)
return NULL;
if (This->lpInFormat == NULL)
return NULL;
/* Could stream have changed? */
if (! This->bFixedStream) {
AVISTREAMINFOW sInfo;
IAVIStream_Info(This->pStream, &sInfo, sizeof(sInfo));
if (sInfo.dwEditCount != This->dwEditCount) {
This->dwEditCount = sInfo.dwEditCount;
This->lCurrentFrame = -1;
}
if (sInfo.dwFormatChangeCount != This->dwFormatChangeCount) {
/* stream has changed */
if (This->lpOutFormat != NULL) {
BITMAPINFOHEADER bi;
bi = *This->lpOutFormat;
AVIFILE_CloseCompressor(This);
if (FAILED(IGetFrame_SetFormat(iface, &bi, NULL, 0, 0, -1, -1))) {
if (FAILED(IGetFrame_SetFormat(iface, NULL, NULL, 0, 0, -1, -1)))
return NULL;
}
} else if (FAILED(IGetFrame_SetFormat(iface, NULL, NULL, 0, 0, -1, -1)))
return NULL;
}
}
if (lPos != This->lCurrentFrame) {
LONG lNext = IAVIStream_FindSample(This->pStream,lPos,FIND_KEY|FIND_PREV);
if (lNext == -1)
return NULL; /* frame doesn't exist */
if (lNext <= This->lCurrentFrame && This->lCurrentFrame < lPos)
lNext = This->lCurrentFrame + 1;
for (; lNext <= lPos; lNext++) {
/* new format for this frame? */
if (This->bFormatChanges) {
IAVIStream_ReadFormat(This->pStream, lNext,
This->lpInFormat, &This->cbInFormat);
if (This->lpOutFormat != NULL) {
if (This->lpOutFormat->biBitCount <= 8)
ICDecompressGetPalette(This->hic, This->lpInFormat,
This->lpOutFormat);
}
}
/* read input frame */
while (FAILED(AVIStreamRead(This->pStream, lNext, 1, This->lpInBuffer,
This->cbInBuffer, &readBytes, &readSamples))) {
/* not enough memory for input buffer? */
readBytes = 0;
if (FAILED(AVIStreamSampleSize(This->pStream, lNext, &readBytes)))
return NULL; /* bad thing, but bad things will happen */
if (readBytes <= 0) {
ERR(": IAVIStream::Read doesn't return needed bytes!\n");
return NULL;
}
/* IAVIStream::Read failed because of other reasons not buffersize? */
if (This->cbInBuffer >= readBytes)
break;
This->cbInBuffer = This->cbInFormat + readBytes;
This->lpInFormat = HeapReAlloc(GetProcessHeap(), 0, This->lpInFormat, This->cbInBuffer);
if (This->lpInFormat == NULL)
return NULL; /* out of memory */
This->lpInBuffer = (BYTE*)This->lpInFormat + This->cbInFormat;
}
if (readSamples != 1) {
ERR(": no frames read\n");
return NULL;
}
if (readBytes != 0) {
This->lpInFormat->biSizeImage = readBytes;
/* nothing to decompress? */
if (This->hic == NULL) {
This->lCurrentFrame = lPos;
return This->lpInFormat;
}
if (This->bResize) {
ICDecompressEx(This->hic,0,This->lpInFormat,This->lpInBuffer,0,0,
This->lpInFormat->biWidth,This->lpInFormat->biHeight,
This->lpOutFormat,This->lpOutBuffer,This->x,This->y,
This->dx,This->dy);
} else {
ICDecompress(This->hic, 0, This->lpInFormat, This->lpInBuffer,
This->lpOutFormat, This->lpOutBuffer);
}
}
} /* for (lNext < lPos) */
} /* if (This->lCurrentFrame != lPos) */
return (This->hic == NULL ? This->lpInFormat : This->lpOutFormat);
}
