/*
* Write or read access to file using the HDF5 interface.
*/
static IOR_offset_t HDF5_Xfer(int access, void *fd, IOR_size_t * buffer,
IOR_offset_t length, IOR_param_t * param)
{
static int firstReadCheck = FALSE, startNewDataSet;
IOR_offset_t segmentPosition, segmentSize;
/*
* this toggle is for the read check operation, which passes through
* this function twice; note that this function will open a data set
* only on the first read check and close only on the second
*/
if (access == READCHECK) {
if (firstReadCheck == TRUE) {
firstReadCheck = FALSE;
} else {
firstReadCheck = TRUE;
}
}
/* determine by offset if need to start new data set */
if (param->filePerProc == TRUE) {
segmentPosition = (IOR_offset_t) 0;
segmentSize = param->blockSize;
} else {
segmentPosition =
(IOR_offset_t) ((rank + rankOffset) % param->numTasks)
* param->blockSize;
segmentSize =
(IOR_offset_t) (param->numTasks) * param->blockSize;
}
if ((IOR_offset_t) ((param->offset - segmentPosition) % segmentSize) ==
0) {
/*
* ordinarily start a new data set, unless this is the
* second pass through during a read check
*/
startNewDataSet = TRUE;
if (access == READCHECK && firstReadCheck != TRUE) {
startNewDataSet = FALSE;
}
}
/* create new data set */
if (startNewDataSet == TRUE) {
/* if just opened this file, no data set to close yet */
if (newlyOpenedFile != TRUE) {
HDF5_CHECK(H5Dclose(dataSet), "cannot close data set");
HDF5_CHECK(H5Sclose(fileDataSpace),
"cannot close file data space");
}
SetupDataSet(fd, param);
}
SeekOffset(fd, param->offset, param);
/* this is necessary to reset variables for reaccessing file */
startNewDataSet = FALSE;
newlyOpenedFile = FALSE;
/* access the file */
if (access == WRITE) { /* WRITE */
HDF5_CHECK(H5Dwrite(dataSet, H5T_NATIVE_LLONG,
memDataSpace, fileDataSpace,
xferPropList, buffer),
"cannot write to data set");
} else { /* READ or CHECK */
HDF5_CHECK(H5Dread(dataSet, H5T_NATIVE_LLONG,
memDataSpace, fileDataSpace,
xferPropList, buffer),
"cannot read from data set");
}
return (length);
}
void AudioPlayer::SeekSecond(float second)
{
SeekOffset(second / GetBufferLengthInSeconds());
}
