long defineSource3D(wavPar wav, srcPar src, modPar mod, recPar rec, float **src_nwav, long reverse, long verbose)
{
FILE *fp;
size_t nread;
long optn, nfreq, i, j, k, iwmax, tracesToDo;
long iw, n1, namp, optnscale, nfreqscale;
float scl, d1, df, deltom, om, tshift;
float amp1, amp2, amp3;
float *trace, maxampl, scale;
complex *ctrace, tmp;
segy hdr;
scale = 1.0;
n1 = wav.ns;
if (wav.random) { /* initialize random sequence */
srand48(wav.seed+1);
seedCMWC4096();
for (i=0; i<8192; i++) {
amp1 = dcmwc4096();
}
}
else {
/* read first header and last byte to get file size */
fp = fopen( wav.file_src, "r" );
assert( fp != NULL);
nread = fread( &hdr, 1, TRCBYTES, fp );
assert(nread == TRCBYTES);
/* read all traces */
tracesToDo = wav.nx;
i = 0;
while (tracesToDo) {
memset(&src_nwav[i][0],0,wav.nt*sizeof(float));
nread = fread(&src_nwav[i][0], sizeof(float), hdr.ns, fp);
assert (nread == hdr.ns);
nread = fread( &hdr, 1, TRCBYTES, fp );
if (nread==0) break;
tracesToDo--;
i++;
}
fclose(fp);
}
optn = loptncr(n1);
nfreq = optn/2 + 1;
if (wav.nt != wav.ns) {
vmess("Sampling in wavelet is %e while for modeling is set to %e", wav.ds, mod.dt);
vmess("Wavelet sampling will be FFT-interpolated to sampling of modeling");
vmess("file_src Nt=%li sampling after interpolation=%li", wav.ns, wav.nt);
optnscale = wav.nt;
nfreqscale = optnscale/2 + 1;
}
else {
optnscale = optn;
nfreqscale = optnscale/2 + 1;
}
// fprintf(stderr,"define S optn=%li ns=%li %e nt=%li %e\n", optn, wav.ns, wav.ds, optnscale, wav.dt);
ctrace = (complex *)calloc(nfreqscale,sizeof(complex));
trace = (float *)calloc(optnscale,sizeof(float));
df = 1.0/(optn*wav.ds);
deltom = 2.*M_PI*df;
scl = 1.0/optn;
iwmax = nfreq;
for (i=0; i<wav.nx; i++) {
if (wav.random) {
randomWavelet3D(wav, src, &src_nwav[i][0], src.tbeg[i], src.tend[i], verbose);
}
else {
memset(&ctrace[0].r,0,nfreqscale*sizeof(complex));
memset(&trace[0],0,optnscale*sizeof(float));
memcpy(&trace[0],&src_nwav[i][0],n1*sizeof(float));
rc1fft(trace,ctrace,optn,-1);
/* Scale source from file with -j/w (=1/(jw)) for volume source injections
no scaling is applied for volume source injection rates */
if (src.injectionrate==0) {
for (iw=1;iw<iwmax;iw++) {
om = 1.0/(deltom*iw);
tmp.r = om*ctrace[iw].i;
tmp.i = -om*ctrace[iw].r;
ctrace[iw].r = tmp.r;
ctrace[iw].i = tmp.i;
}
}
if (src.type < 6) { // shift wavelet with +1/2 DeltaT due to staggered in time
tshift=-(0.5*rec.skipdt+1.5)*wav.dt;
for (iw=1;iw<iwmax;iw++) {
om = deltom*iw*tshift;
tmp.r = ctrace[iw].r*cos(-om) - ctrace[iw].i*sin(-om);
tmp.i = ctrace[iw].i*cos(-om) + ctrace[iw].r*sin(-om);
ctrace[iw].r = tmp.r;
ctrace[iw].i = tmp.i;
}
}
/* zero frequency iw=0 set to 0 if the next sample has amplitude==0*/
amp1 = sqrt(ctrace[1].r*ctrace[1].r+ctrace[1].i*ctrace[1].i);
if (amp1 == 0.0) {
ctrace[0].r = ctrace[0].i = 0.0;
}
else { /* stabilization for w=0: extrapolate amplitudes to 0 */
amp2 = sqrt(ctrace[2].r*ctrace[2].r+ctrace[2].i*ctrace[2].i);
amp3 = sqrt(ctrace[3].r*ctrace[3].r+ctrace[3].i*ctrace[3].i);
ctrace[0].r = amp1+(2.0*(amp1-amp2)-(amp2-amp3));
ctrace[0].i = 0.0;
if (ctrace[1].r < 0.0) {
ctrace[0].r *= -1.0;
}
}
for (iw=iwmax;iw<nfreqscale;iw++) {
ctrace[iw].r = 0.0;
ctrace[iw].i = 0.0;
}
memset(&trace[0],0,optnscale*sizeof(float));
cr1fft(ctrace,trace,optnscale,1);
/* avoid a (small) spike in the last sample
this is done to avoid diffraction from last wavelet sample
which will act as a pulse */
maxampl=0.0;
if (reverse) {
for (j=0; j<wav.nt; j++) {
src_nwav[i][j] = scl*(trace[wav.nt-j-1]-trace[0]);
maxampl = MAX(maxampl,fabs(src_nwav[i][j]));
}
}
else {
for (j=0; j<wav.nt; j++) {
src_nwav[i][j] = scl*(trace[j]-trace[wav.nt-1]);
maxampl = MAX(maxampl,fabs(src_nwav[i][j]));
}
}
if (verbose > 3) vmess("Wavelet sampling (FFT-interpolated) done for trace %li", i);
}
}
/* set values smaller than 1e-5 maxampl to zero */
maxampl *= 1e-5;
for (i=0; i<wav.nx; i++) {
for (j=0; j<wav.nt; j++) {
if (fabs(src_nwav[i][j]) < maxampl) src_nwav[i][j] = 0.0;
}
}
free(ctrace);
free(trace);
/* use random amplitude gain factor for each source */
if (src.amplitude > 0.0) {
namp=wav.nx*10;
trace = (float *)calloc(2*namp,sizeof(float));
for (i=0; i<wav.nx; i++) {
if (src.distribution) {
scl = gaussGen()*src.amplitude;
k = (long)MAX(MIN(namp*(scl+5*src.amplitude)/(10*src.amplitude),namp-1),0);
d1 = 10.0*src.amplitude/(namp-1);
}
else {
scl = (float)(drand48()-0.5)*src.amplitude;
k = (long)MAX(MIN(namp*(scl+1*src.amplitude)/(2*src.amplitude),namp-1),0);
d1 = 2.0*src.amplitude/(namp-1);
}
trace[k] += 1.0;
/* trace[i] = scl; */
if (wav.random) n1 = wav.nsamp[i];
else n1 = wav.nt;
for (j=0; j<n1; j++) {
src_nwav[i][j] *= scl;
}
}
if (verbose>2) writesufile3D("src_ampl.su", trace, namp, 1, -5*src.amplitude, 0.0, d1, 1);
free(trace);
}
if (verbose>3) writesufilesrcnwav3D("src_nwav.su", src_nwav, wav, wav.nt, wav.nx, 0.0, 0.0, wav.dt, 1);
return 0;
}
int defineSource(wavPar wav, srcPar src, float **src_nwav, int reverse, int verbose)
{
FILE *fp;
size_t nread;
int optn, nfreq, i, j, k, iwmax, tracesToDo;
int iw, n1, namp;
float scl, d1, df, deltom, om, tshift;
float amp1, amp2, amp3;
float *trace, maxampl;
complex *ctrace, tmp;
segy hdr;
n1 = wav.nt;
if (wav.random) { /* initialize random sequence */
srand48(wav.seed+1);
seedCMWC4096();
for (i=0; i<8192; i++) {
amp1 = dcmwc4096();
}
}
else {
/* read first header and last byte to get file size */
fp = fopen( wav.file_src, "r" );
assert( fp != NULL);
nread = fread( &hdr, 1, TRCBYTES, fp );
assert(nread == TRCBYTES);
/* read all traces */
tracesToDo = wav.nx;
i = 0;
while (tracesToDo) {
memset(&src_nwav[i][0],0,n1*sizeof(float));
nread = fread(&src_nwav[i][0], sizeof(float), hdr.ns, fp);
assert (nread == hdr.ns);
nread = fread( &hdr, 1, TRCBYTES, fp );
if (nread==0) break;
tracesToDo--;
i++;
}
fclose(fp);
}
optn = optncr(2*n1);
nfreq = optn/2 + 1;
ctrace = (complex *)calloc(nfreq,sizeof(complex));
trace = (float *)calloc(optn,sizeof(float));
df = 1.0/(optn*wav.dt);
deltom = 2.*M_PI*df;
scl = 1.0/optn;
maxampl=0.0;
iwmax = nfreq;
for (i=0; i<wav.nx; i++) {
if (wav.random) {
randomWavelet(wav, src, &src_nwav[i][0], src.tbeg[i], src.tend[i], verbose);
}
else {
memset(&ctrace[0].r,0,nfreq*sizeof(complex));
memset(&trace[0],0,optn*sizeof(float));
memcpy(&trace[0],&src_nwav[i][0],n1*sizeof(float));
rc1fft(trace,ctrace,optn,-1);
/* Scale source from file with -j/w (=1/(jw)) for volume source injections
no scaling is applied for volume source injection rates */
if (src.injectionrate==0) {
for (iw=1;iw<iwmax;iw++) {
om = 1.0/(deltom*iw);
tmp.r = om*ctrace[iw].i;
tmp.i = -om*ctrace[iw].r;
ctrace[iw].r = tmp.r;
ctrace[iw].i = tmp.i;
}
}
/*
*/
if (src.type < 6) { // shift wavelet with +1/2 DeltaT due to staggered in time
tshift=0.5*wav.dt;
for (iw=1;iw<iwmax;iw++) {
om = deltom*iw*tshift;
tmp.r = ctrace[iw].r*cos(-om) - ctrace[iw].i*sin(-om);
tmp.i = ctrace[iw].i*cos(-om) + ctrace[iw].r*sin(-om);
ctrace[iw].r = tmp.r;
ctrace[iw].i = tmp.i;
}
}
/* zero frequency iw=0 set to 0 if the next sample has amplitude==0*/
amp1 = sqrt(ctrace[1].r*ctrace[1].r+ctrace[1].i*ctrace[1].i);
if (amp1 == 0.0) {
ctrace[0].r = ctrace[0].i = 0.0;
}
else { /* stabilization for w=0: extrapolate amplitudes to 0 */
amp2 = sqrt(ctrace[2].r*ctrace[2].r+ctrace[2].i*ctrace[2].i);
amp3 = sqrt(ctrace[3].r*ctrace[3].r+ctrace[3].i*ctrace[3].i);
ctrace[0].r = amp1+(2.0*(amp1-amp2)-(amp2-amp3));
ctrace[0].i = 0.0;
if (ctrace[1].r < 0.0) {
ctrace[0].r *= -1.0;
}
}
for (iw=iwmax;iw<nfreq;iw++) {
ctrace[iw].r = 0.0;
ctrace[iw].i = 0.0;
}
cr1fft(ctrace,trace,optn,1);
/* avoid a (small) spike in the last sample
this is done to avoid diffraction from last wavelet sample
which will act as a pulse */
if (reverse) {
for (j=0; j<n1; j++) src_nwav[i][j] = scl*(trace[n1-j-1]-trace[0]);
// for (j=0; j<n1; j++) src_nwav[i][j] = scl*(trace[j]-trace[optn-1]);
}
else {
for (j=0; j<n1; j++) src_nwav[i][j] = scl*(trace[j]-trace[optn-1]);
}
}
}
free(ctrace);
free(trace);
/* use random amplitude gain factor for each source */
if (src.amplitude > 0.0) {
namp=wav.nx*10;
trace = (float *)calloc(2*namp,sizeof(float));
for (i=0; i<wav.nx; i++) {
if (src.distribution) {
scl = gaussGen()*src.amplitude;
k = (int)MAX(MIN(namp*(scl+5*src.amplitude)/(10*src.amplitude),namp-1),0);
d1 = 10.0*src.amplitude/(namp-1);
}
else {
scl = (float)(drand48()-0.5)*src.amplitude;
k = (int)MAX(MIN(namp*(scl+1*src.amplitude)/(2*src.amplitude),namp-1),0);
d1 = 2.0*src.amplitude/(namp-1);
}
trace[k] += 1.0;
/* trace[i] = scl; */
if (wav.random) n1 = wav.nsamp[i];
else n1 = wav.nt;
for (j=0; j<n1; j++) {
src_nwav[i][j] *= scl;
}
}
if (verbose>2) writesufile("src_ampl.su", trace, namp, 1, -5*src.amplitude, 0.0, d1, 1);
/*
qsort(trace,wav.nx,sizeof(float), comp);
for (i=0; i<wav.nx; i++) {
scl = trace[i];
trace[i] = normal(scl, 0.0, src.amplitude);
}
if (verbose>2) writesufile("src_ampl.su", trace, wav.nx, 1, -5*src.amplitude, 0.0, d1, 1);
*/
free(trace);
}
if (verbose>3) writesufilesrcnwav("src_nwav.su", src_nwav, wav, wav.nt, wav.nx, 0.0, 0.0, wav.dt, 1);
/* set maximum amplitude in source file to 1.0 */
/*
assert(maxampl != 0.0);
scl = wav.dt/(maxampl);
scl = 1.0/(maxampl);
for (i=0; i<wav.nx; i++) {
for (j=0; j<n1; j++) {
src_nwav[i*n1+j] *= scl;
}
}
*/
return 0;
}
