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#include "stdio.h"
#ifndef mips
#include "stdlib.h"
#endif
#include "xlisp.h"
#include "sound.h"
#include "falloc.h"
#include "cext.h"
#include "fromarraystream.h"
void fromarraystream_free();
typedef struct fromarraystream_susp_struct {
snd_susp_node susp;
long index;
long length;
LVAL array;
LVAL src;
sample_type *samples;
} fromarraystream_susp_node, *fromarraystream_susp_type;
/* IMPLEMENTATION NOTE:
* The src argument is an XLisp object that returns either an
* array of samples or NIL. The output of ifft is simply the
* concatenation of the samples taken from the array. Later,
* an ifft will be plugged in and this will return overlapped
* adds of the ifft's.
*/
#include "samples.h"
void fromarraystream__fetch(register fromarraystream_susp_type susp, snd_list_type snd_list)
{
int cnt = 0; /* how many samples computed */
int togo;
int n;
sample_block_type out;
register sample_block_values_type out_ptr;
register sample_block_values_type out_ptr_reg;
register long index_reg;
register sample_type * samples_reg;
falloc_sample_block(out, "fromarraystream__fetch");
out_ptr = out->samples;
snd_list->block = out;
while (cnt < max_sample_block_len) { /* outer loop */
/* first compute how many samples to generate in inner loop: */
/* don't overflow the output sample block: */
togo = max_sample_block_len - cnt;
if (susp->src == NULL) {
out: togo = 0; /* indicate termination */
break; /* we're done */
}
if (susp->index >= susp->length) {
long i;
susp->index = 0;
susp->array = xleval(cons(s_send, cons(susp->src, consa(s_next))));
susp->index = 0;
if (susp->array == NULL) {
susp->src = NULL;
goto out;
} else if (!vectorp(susp->array)) {
xlerror("array expected", susp->array);
} else if (susp->samples == NULL) {
/* assume arrays are all the same size as first one;
now that we know the size, we just have to do this
first allocation.
*/
susp->length = getsize(susp->array);
if (susp->length < 1) xlerror("array has no elements", susp->array);
susp->samples =
(sample_type *) calloc(susp->length,
sizeof(sample_type));
} else if (getsize(susp->array) != susp->length) {
xlerror("arrays must all be the same length", susp->array);
}
/* at this point, we have a new array and a place to put samples */
for (i = 0; i < susp->length; i++) {
LVAL elem = getelement(susp->array, i);
if (ntype(elem) != FLONUM) {
xlerror("flonum expected", elem);
}
susp->samples[i] = (sample_type) getflonum(elem);
}
susp->array = NULL; /* free the array */
}
togo = MIN(togo, susp->length - susp->index);
n = togo;
index_reg = susp->index;
samples_reg = susp->samples;
out_ptr_reg = out_ptr;
if (n) do { /* the inner sample computation loop */
*out_ptr_reg++ = samples_reg[index_reg++];;
} while (--n); /* inner loop */
susp->index = index_reg;
out_ptr += togo;
cnt += togo;
} /* outer loop */
/* test for termination */
if (togo == 0 && cnt == 0) {
snd_list_terminate(snd_list);
} else {
snd_list->block_len = cnt;
susp->susp.current += cnt;
}
} /* fromarraystream__fetch */
void fromarraystream_mark(fromarraystream_susp_type susp)
{
if (susp->src) mark(susp->src);
if (susp->array) mark(susp->array);
}
void fromarraystream_free(fromarraystream_susp_type susp)
{
free(susp->samples);
ffree_generic(susp, sizeof(fromarraystream_susp_node), "fromarraystream_free");
}
void fromarraystream_print_tree(fromarraystream_susp_type susp, int n)
{
}
sound_type snd_make_fromarraystream(time_type t0, rate_type sr, LVAL src)
{
register fromarraystream_susp_type susp;
/* sr specified as input parameter */
/* t0 specified as input parameter */
sample_type scale_factor = 1.0F;
falloc_generic(susp, fromarraystream_susp_node, "snd_make_fromarraystream");
susp->index = 0;
susp->length = 0;
susp->array = NULL;
susp->src = src;
susp->samples = NULL;;
susp->susp.fetch = fromarraystream__fetch;
/* initialize susp state */
susp->susp.free = fromarraystream_free;
susp->susp.sr = sr;
susp->susp.t0 = t0;
susp->susp.mark = fromarraystream_mark;
susp->susp.print_tree = fromarraystream_print_tree;
susp->susp.name = "fromarraystream";
susp->susp.log_stop_cnt = UNKNOWN;
susp->susp.current = 0;
return sound_create((snd_susp_type)susp, t0, sr, scale_factor);
}
sound_type snd_fromarraystream(time_type t0, rate_type sr, LVAL src)
{
return snd_make_fromarraystream(t0, sr, src);
}
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