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/* Copyright (C) 2013, 2015, 2016 D. V. Wiebe
*
***************************************************************************
*
* This file is part of the GetData project.
*
* GetData is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* GetData is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with GetData; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "gd_matlab.h"
/*
% GD_GETDATA Retrieve vector data
%
% V = GD_GETDATA(DIRFILE,FIELD_CODE,FIRST_FRAME,FIRST_SAMP,NFRAMES,NSAMP ...
% [,TYPE])
% retrieves a vector, V, of NFRAMES frames plus NSAMPLES samples of
% data from the vector field FIELD_CODE starting FIRST_SAMP samples
% past the start of FIRST_FRAME. If TYPE is given, it should be
% one of the data type symbols provided by GETDATA_CONSTANTS,
% otherwise the data are returned in their native type.
%
% If TYPE is the NULL data type, this function simply returns the
% number of samples read, instead of a vector of data.
%
% The DIRFILE object should have previously been created with GD_OPEN.
%
% See the documentation on the C API function gd_getdata(3) in
% section 3 of the UNIX manual for more details.
%
% See also GD_PUTDATA, GD_OPEN
*/
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
DIRFILE *D;
char *field_code;
int64_t first_frame, first_samp;
size_t nsamp;
gd_type_t type;
void *data;
GDMX_CHECK_RHS2(6,7);
D = gdmx_to_dirfile(prhs[0]);
field_code = gdmx_to_string(prhs, 1, 0);
first_frame = gdmx_to_int64(prhs, 2);
first_samp = gdmx_to_int64(prhs, 3);
nsamp = gdmx_to_nsamp(D, field_code, prhs, 4, 5);
if (nrhs > 6)
type = gdmx_to_gd_type(prhs, 6);
else {
type = gd_native_type(D, field_code);
gdmx_err(D, 0);
}
if (gd_entry_type(D, field_code) == GD_SINDIR_ENTRY) {
const char **data = mxMalloc(sizeof(*data) * nsamp);
nsamp = gd_getdata64(D, field_code, (gd_off64_t)first_frame,
(gd_off64_t)first_samp, 0, nsamp, GD_STRING, data);
mxFree(field_code);
gdmx_err(D, 0);
plhs[0] = gdmx_from_nstring_list(data, nsamp);
mxFree(data);
} else if (type == GD_NULL) {
nsamp = gd_getdata64(D, field_code, (gd_off64_t)first_frame,
(gd_off64_t)first_samp, 0, nsamp, GD_NULL, NULL);
mxFree(field_code);
gdmx_err(D, 0);
plhs[0] = gdmx_from_int64(nsamp);
} else {
plhs[0] = gdmx_vector(type, nsamp, &data);
nsamp = gd_getdata64(D, field_code, (gd_off64_t)first_frame,
(gd_off64_t)first_samp, 0, nsamp, type, data);
mxFree(field_code);
gdmx_err(D, 0);
gdmx_fix_vector(plhs[0], type, nsamp, data);
}
}
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