static LONG WINAPI IEditAVIStream_fnFindSample(IAVIStream*iface,LONG pos,
LONG flags)
{
IAVIEditStreamImpl *This = impl_from_IAVIStream( iface );
PAVISTREAM stream;
DWORD streamPos, streamNr;
TRACE("(%p,%d,0x%08X)\n",iface,pos,flags);
if (flags & FIND_FROM_START)
pos = (LONG)This->sInfo.dwStart;
/* outside of stream? */
if (pos < (LONG)This->sInfo.dwStart ||
(LONG)This->sInfo.dwStart + (LONG)This->sInfo.dwLength <= pos)
return -1;
/* map our position to a stream and position in it */
if (AVIFILE_FindStreamInTable(This, pos, &stream, &streamPos,
&streamNr, TRUE) != S_OK)
return -1; /* doesn't exist */
if (This->bDecompress) {
/* only one stream -- format changes only at start */
if (flags & FIND_FORMAT)
return (flags & FIND_NEXT ? -1 : 0);
/* FIXME: map positions back to us */
return IAVIStream_FindSample(stream, streamPos, flags);
} else {
/* assume change of format every frame */
return pos;
}
}
static LONG WINAPI ACMStream_fnFindSample(IAVIStream *iface, LONG pos,
LONG flags)
{
IAVIStreamImpl *This = (IAVIStreamImpl *)iface;
TRACE("(%p,%d,0x%08X)\n",iface,pos,flags);
if (flags & FIND_FROM_START) {
pos = This->sInfo.dwStart;
flags &= ~(FIND_FROM_START|FIND_PREV);
flags |= FIND_NEXT;
}
/* convert pos from our 'space' to This->pStream's one */
CONVERT_THIS_to_STREAM(&pos);
/* ask stream */
pos = IAVIStream_FindSample(This->pStream, pos, flags);
if (pos != -1) {
/* convert pos back to our 'space' if it's no size or physical pos */
if ((flags & FIND_RET) == 0)
CONVERT_STREAM_to_THIS(&pos);
}
return pos;
}
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);
}