int get_PSRFITS_rawblock(float *fdata, struct spectra_info *s, int *padding)
// This routine reads a single block (i.e subint) from the input files
// which contain raw data in PSRFITS format. If padding is
// returned as 1, then padding was added and statistics should not be
// calculated. Return 1 on success.
{
int numtopad = 0, numtoread, status = 0, anynull;
float *fdataptr = fdata;
double offs_sub;
fdataptr = fdata + numbuffered * s->num_channels;
// numtoread is always this size since we need to read
// full PSRFITS subints...
numtoread = s->spectra_per_subint;
// If our buffer array is offset from last time,
// copy the previously offset part into the beginning.
// New data comes after the old data in the buffer.
if (numbuffered)
memcpy(fdata, fdata + numtoread * s->num_channels,
numbuffered * s->num_channels * sizeof(float));
// Make sure our current file number is valid
if (cur_file >= s->num_files) return 0;
// Read a subint of data from the DATA col
if (cur_subint <= s->num_subint[cur_file]) {
// Read the OFFS_SUB column value in case there were dropped blocks
fits_read_col(s->fitsfiles[cur_file], TDOUBLE,
s->offs_sub_col, cur_subint, 1L, 1L,
0, &offs_sub, &anynull, &status);
// Set last_offs_sub to proper value
if (cur_subint==1 && (offs_sub < s->time_per_subint)) {
if (cur_file==0) {
// This is for the first time
last_offs_sub = offs_sub - s->time_per_subint;
} else {
// And this is if we are combining observations
last_offs_sub = (s->start_spec[cur_file] -
(cur_spec + numbuffered)) * s->dt -
0.5 * s->time_per_subint;
}
}
// The following determines if there were lost blocks. We should
// always be within 0.5 sample (and only that big if we are putting
// two different observations together).
if (fabs((offs_sub - last_offs_sub) - s->time_per_subint) < 0.5 * s->dt) {
// if things look good, with no missing blocks, read the data
get_PSRFITS_subint(fdataptr, cdatabuffer, s);
last_offs_sub = offs_sub;
cur_subint++;
goto return_block;
} else {
if (offs_sub < last_offs_sub) { // Files out of order? Shouldn't get here.
fprintf(stderr, "Error!: Current subint has earlier time than previous!\n\n"
"\tfilename = '%s', subint = %d\n"
"\tlast_offs_sub = %20.15f offs_sub = %20.15f\n",
s->filenames[cur_file], cur_subint, last_offs_sub, offs_sub);
exit(1);
} else { // there is some missing data, use padding
numtopad = (int)round((offs_sub - last_offs_sub) / s->dt) - numbuffered;
if (numtopad > s->spectra_per_subint) numtopad = s->spectra_per_subint;
add_padding(fdataptr, s->padvals, s->num_channels, numtopad);
// Update the time of the last subs based on this padding
last_offs_sub += numtopad * s->dt;
// Update pointer into the buffer
numbuffered = (numbuffered + numtopad) % s->spectra_per_subint;
// Set the padding flag
*padding = 1;
// If we haven't gotten a full block, or completed the buffered one
// then recursively call get_PSRFITS_rawblock()
if (numbuffered)
return get_PSRFITS_rawblock(fdata, s, padding);
else
goto return_block;
}
}
} else {
// We can't read anymore... so read OFFS_SUB for the last row
// of the current file to see about padding
fits_read_col(s->fitsfiles[cur_file], TDOUBLE,
s->offs_sub_col, s->num_subint[cur_file], 1L, 1L,
0, &offs_sub, &anynull, &status);
}
if (s->num_pad[cur_file]==0 ||
(fabs(last_offs_sub - offs_sub) < 0.5 * s->dt)) {
// No padding is necessary. The second check means that the
// lack of data we noticed upon reading the file was due to
// dropped data in the middle of the file that we already
// fixed. So no padding is really necessary.
cur_file++;
cur_subint = 1;
return get_PSRFITS_rawblock(fdata, s, padding);
} else { // add padding
// Set offs_sub to the correct offs_sub time for the first
// row of the next file. Since that might or might not
// be from a different observation, use absolute times from
// the start of the observation for both offs_sub and last_offs_sub
offs_sub = s->start_spec[cur_file+1] * s->dt + 0.5 * s->time_per_subint;
last_offs_sub = (cur_spec + numbuffered) * s->dt - 0.5 * s->time_per_subint;
// Compute the amount of required padding
numtopad = (int)round((offs_sub - last_offs_sub) / s->dt) - numbuffered;
if (numtopad > s->spectra_per_subint) numtopad = s->spectra_per_subint;
add_padding(fdataptr, s->padvals, s->num_channels, numtopad);
// Update the time of the last subs based on this padding
last_offs_sub += numtopad * s->dt;
// Update pointer into the buffer
numbuffered = (numbuffered + numtopad) % s->spectra_per_subint;
// Set the padding flag
*padding = 1;
// If we haven't gotten a full block, or completed the buffered one
// then recursively call get_PSRFITS_rawblock()
if (numbuffered)
return get_PSRFITS_rawblock(fdata, s, padding);
else
goto return_block;
}
return_block:
// Apply the corrections that need a full block
// Invert the band if needed
if (s->apply_flipband) flip_band(fdata, s);
// Perform Zero-DMing if requested
if (s->remove_zerodm) remove_zerodm(fdata, s);
// Increment our static counter (to determine how much data we
// have written on the fly).
cur_spec += s->spectra_per_subint;
return 1;
}
int get_PSRFITS_rawblock(float *fdata, struct spectra_info *s, int *padding)
// This routine reads a single block (i.e subint) from the input files
// which contain raw data in PSRFITS format. If padding is
// returned as 1, then padding was added and statistics should not be
// calculated. Return 1 on success.
{
int numtopad = 0, numtoread, status = 0, anynull;
float *fdataptr = fdata;
fdataptr = fdata + numbuffered * s->num_channels;
// numtoread is always this size since we need to read
// full PSRFITS subints...
numtoread = s->spectra_per_subint;
// If our buffer array is offset from last time,
// copy the previously offset part into the beginning.
// New data comes after the old data in the buffer.
if (numbuffered)
memcpy((char *) fdata, (char *) (fdata + numtoread * s->num_channels),
numbuffered * s->num_channels * sizeof(float));
// Make sure our current file number is valid
if (cur_file >= s->num_files)
return 0;
// Read a subint of data from the DATA col
if (cur_subint <= s->num_subint[cur_file]) {
double offs_sub = 0.0;
if (!offs_sub_are_zero) {
// Read the OFFS_SUB column value in case there were dropped blocks
fits_read_col(s->fitsfiles[cur_file], TDOUBLE,
s->offs_sub_col, cur_subint, 1L, 1L,
0, &offs_sub, &anynull, &status);
// Set new_spec to proper value, accounting for possibly
// missing initial rows of data and/or combining observations
// Note: need to remove start_subint because that was already put
// into start_spec. This is important if initial rows are gone.
new_spec = s->start_spec[cur_file] +
roundl((offs_sub - (s->start_subint[cur_file] + 0.5)
* s->time_per_subint) / s->dt);
} else {
new_spec = s->start_spec[cur_file] +
(cur_subint - 1) * s->spectra_per_subint;
}
//printf("cur/new_spec = %lld, %lld s->start_spec[cur_file] = %lld\n",
// cur_spec, new_spec, s->start_spec[cur_file]);
// The following determines if there were lost blocks, or if
// we are putting different observations together so that
// the blocks are not aligned
if (new_spec == cur_spec + numbuffered) {
// if things look good, with no missing blocks, read the data
get_PSRFITS_subint(fdataptr, cdatabuffer, s);
cur_subint++;
goto return_block;
} else {
goto padding_block;
}
} else {
// We are going to move to the next file, so update
// new_spec to be the starting spectra from the next file
// so we can see if any padding is necessary
if (cur_file < s->num_files - 1)
new_spec = s->start_spec[cur_file + 1];
else
new_spec = cur_spec + numbuffered;
}
if (new_spec == cur_spec + numbuffered) {
// No padding is necessary, so switch files
cur_file++;
cur_subint = 1;
return get_PSRFITS_rawblock(fdata, s, padding);
} else { // add padding
goto padding_block;
}
padding_block:
if (new_spec < cur_spec) {
// Files out of order? Shouldn't get here.
fprintf(stderr, "Error!: Current subint has earlier time than previous!\n\n"
"\tfilename = '%s', subint = %d\n"
"\tcur_spec = %lld new_spec = %lld\n",
s->filenames[cur_file], cur_subint, cur_spec, new_spec);
exit(1);
}
numtopad = new_spec - cur_spec;
// Don't add more than 1 block and if buffered, then realign the buffer
if (numtopad > (s->spectra_per_subint - numbuffered))
numtopad = s->spectra_per_subint - numbuffered;
add_padding(fdataptr, s->padvals, s->num_channels, numtopad);
// Update pointer into the buffer
numbuffered = (numbuffered + numtopad) % s->spectra_per_subint;
// Set the padding flag
*padding = 1;
// If we haven't gotten a full block, or completed the buffered one
// then recursively call get_PSRFITS_rawblock()
if (numbuffered) {
printf("Adding %d spectra of padding to buffer at subint %d\n",
numtopad, cur_subint);
return get_PSRFITS_rawblock(fdata, s, padding);
} else {
printf("Adding %d spectra of padding at subint %d\n", numtopad, cur_subint);
goto return_block;
}
return_block:
// Apply the corrections that need a full block
// Invert the band if needed
if (s->apply_flipband)
flip_band(fdata, s);
// Perform Zero-DMing if requested
if (s->remove_zerodm)
remove_zerodm(fdata, s);
// Increment our static counter (to determine how much data we
// have written on the fly).
cur_spec += s->spectra_per_subint;
return 1;
}
