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/* sndread.c -- read sound files */
/* CHANGELOG
*
* 29Jun95 RBD ULAW fixed problems with signed chars
* 28Apr03 dm explicitly declare sndread_file_open_count as int
*/
#include "switches.h"
#include "stdio.h"
#include "string.h"
#ifdef UNIX
#include "sys/file.h"
#else
/* #include <unistd.h> */
#ifdef WINDOWS
#include <sys/stat.h>
#include "io.h"
#else
#include <stat.h>
#endif
#define L_SET SEEK_SET
#define L_INCR SEEK_CUR
#define PROTECTION
#endif
#ifndef mips
#include "stdlib.h"
#endif
#include "snd.h"
#include "xlisp.h"
#include "sound.h"
#include "falloc.h"
#include "sndread.h"
#include "multiread.h"
/* file.h doesn't define O_RDONLY under RS6K AIX */
#ifndef O_RDONLY
#define O_RDONLY 0
#endif
static int sndread_file_open_count = 0;
void read__fetch(susp, snd_list)
register read_susp_type susp;
snd_list_type snd_list;
{
int n;
sample_block_type out;
register sample_block_values_type out_ptr;
/* allow up to 4 bytes/sample: */
char input_buffer[max_sample_block_len * 4];
int in_count;
float peak;
falloc_sample_block(out, "read__fetch");
out_ptr = out->samples;
snd_list->block = out;
in_count = snd_read(&susp->snd, input_buffer, max_sample_block_len);
n = in_count;
/* don't read too many */
if (n > (susp->cnt - susp->susp.current)) {
n = susp->cnt - susp->susp.current;
}
/* NOTE: this could be optimized for cvt_from_float_32 by reading
* raw bytes from the file directly into out_ptr, but 32-bit files
* do not seem important to optimize for.
*/
(*susp->cvtfn)((void *) out_ptr, (void *) input_buffer,
n, 1.0F, &peak);
snd_list->block_len = n;
susp->susp.current += n;
if (n == 0) {
/* we didn't read anything, but can't return length zero, so
convert snd_list to pointer to zero block */
snd_list_terminate(snd_list);
} else if (n < max_sample_block_len) {
/* this should close file and free susp */
snd_list_unref(snd_list->u.next);
/* if something is in buffer, terminate by pointing to zero block */
snd_list->u.next = zero_snd_list;
}
} /* read__fetch */
void read_free(read_susp_type susp)
{
(void) snd_close(&susp->snd);
sndread_file_open_count--;
ffree_generic(susp, sizeof(read_susp_node), "read_free");
}
void read_print_tree(read_susp_type susp, int n)
{
}
LVAL snd_make_read(
unsigned char *filename, /* file to read */
time_type offset, /* offset to skip (in seconds) */
time_type t0, /* start time of resulting sound */
long *format, /* AIFF, IRCAM, NeXT, etc. */
long *channels, /* number of channels */
long *mode, /* sample format: PCM, ALAW, etc. */
long *bits, /* BPS: bits per sample */
long *swap, /* swap bytes? */
double *srate, /* srate: sample rate */
double *dur, /* duration (in seconds) to read */
long *flags, /* which parameters have been set */
long *byte_offset) /* byte offset in file of first sample */
{
register read_susp_type susp;
/* srate specified as input parameter */
sample_type scale_factor = 1.0F;
long bytes_per_frame;
long bytes_of_data;
falloc_generic(susp, read_susp_node, "snd_make_read");
susp->snd.device = SND_DEVICE_FILE;
susp->snd.write_flag = SND_READ;
strcpy(susp->snd.u.file.filename, (char *) filename);
susp->snd.u.file.header = *format;
susp->snd.u.file.end_offset = 1000000000; /* 1 gig, in case open doesn't set it */
susp->snd.format.channels = *channels;
susp->snd.format.mode = *mode;
susp->snd.format.bits = *bits;
susp->snd.u.file.swap = *swap;
susp->snd.format.srate = *srate;
if (SND_SUCCESS != snd_open(&susp->snd, flags)) {
char error[240];
sprintf(error, "SND-READ: Cannot open file '%s'", filename);
xlfail(error);
}
if (susp->snd.format.channels < 1) {
snd_close(&susp->snd);
xlfail("Must specify 1 or more channels");
}
if (offset < 0.0) xlfail("Negative offset");
else if (offset > 0.0) {
if (snd_seek(&susp->snd, offset) != SND_SUCCESS) {
snd_close(&susp->snd);
return NIL;
}
}
/* see if file is shorter than requested duration and adjust */
bytes_of_data = susp->snd.u.file.end_offset - susp->snd.u.file.byte_offset;
bytes_per_frame = snd_bytes_per_frame(&susp->snd);
if ((*flags & SND_HEAD_LEN) &&
(((long) (*dur * susp->snd.format.srate + 0.5)) * bytes_per_frame >
bytes_of_data)) {
*dur = (bytes_of_data / bytes_per_frame) / susp->snd.format.srate;
}
/* initialize susp state */
susp->susp.sr = susp->snd.format.srate;
susp->susp.t0 = t0;
susp->bytes_per_sample = (susp->snd.format.bits + 7) >> 3;
susp->susp.mark = NULL;
susp->susp.print_tree = read_print_tree;
susp->susp.current = 0;
susp->cnt = (long) ((*dur * susp->snd.format.srate) + 0.5);
/* convert_from functions */
if (susp->snd.format.bits == 8)
susp->cvtfn = cvt_from_8[susp->snd.format.mode];
else if (susp->snd.format.bits == 16)
susp->cvtfn = cvt_from_16[susp->snd.format.mode];
else if (susp->snd.format.bits == 32)
susp->cvtfn = cvt_from_32[susp->snd.format.mode];
else susp->cvtfn = cvt_from_unknown;
if (susp->cvtfn == cvt_from_unknown) {
snd_close(&susp->snd);
return NIL;
}
*format = susp->snd.u.file.header;
*channels = susp->snd.format.channels;
*mode = susp->snd.format.mode;
*bits = susp->snd.format.bits;
*swap = susp->snd.u.file.swap;
*srate = susp->snd.format.srate;
*byte_offset = susp->snd.u.file.byte_offset;
sndread_file_open_count++;
#ifdef MACINTOSH
if (sndread_file_open_count > 24) {
nyquist_printf("Warning: more than 24 sound files are now open\n");
}
#endif
if (susp->snd.format.channels == 1) {
susp->susp.fetch = read__fetch;
susp->susp.free = read_free;
susp->susp.name = "read";
return cvsound(sound_create((snd_susp_type)susp, t0,
susp->snd.format.srate,
scale_factor));
} else {
susp->susp.fetch = multiread_fetch;
susp->susp.free = multiread_free;
susp->susp.name = "multiread";
return multiread_create(susp);
}
}
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