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dft_filter: use 64-bit numbers to count samples

--- a/src/dft_filter.c

+++ b/src/dft_filter.c

@@ -89,7 +89,7 @@

   if (*isamp && odone < *osamp) {

     double * t = fifo_write(&p->input_fifo, (int)*isamp, NULL);

-    p->samples_in += (int)*isamp;

+    p->samples_in += *isamp;

     for (i = *isamp; i; --i)

       *t++ = SOX_SAMPLE_TO_FLOAT_64BIT(*ibuf++, effp->clips);

@@ -104,11 +104,11 @@

 {

   priv_t * p = (priv_t *)effp->priv;

   static size_t isamp = 0;

-  size_t samples_out = p->samples_in;

-  size_t remaining = samples_out - p->samples_out;

+  size_t remaining = p->samples_in > p->samples_out ?

+      (size_t)(p->samples_in - p->samples_out) : 0;

   double * buff = lsx_calloc(1024, sizeof(*buff));

-  if ((int)remaining > 0) {

+  if (remaining > 0) {

     while ((size_t)fifo_occupancy(&p->output_fifo) < remaining) {

       fifo_write(&p->input_fifo, 1024, buff);

       p->samples_in += 1024;

--- a/src/dft_filter.h

+++ b/src/dft_filter.h

@@ -8,7 +8,7 @@

 } dft_filter_t;

 typedef struct {

-  size_t     samples_in, samples_out;

+  uint64_t   samples_in, samples_out;

   fifo_t     input_fifo, output_fifo;

   dft_filter_t   filter, * filter_ptr;

 } dft_filter_priv_t;