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/*
* FILE: tonegen.c
* PROGRAM: RAT
* AUTHORS: Orion Hodson
*
* Copyright (c) 1999-2001 University College London
* All rights reserved.
*/
#ifndef HIDE_SOURCE_STRINGS
static const char cvsid[] =
"$Id: tonegen.c,v 1.6 2001/01/08 20:30:10 ucaccsp Exp $";
#endif /* HIDE_SOURCE_STRINGS */
#include "config_unix.h"
#include "config_win32.h"
#include "debug.h"
#include "memory.h"
#include "util.h"
#include "ts.h"
#include "audio_types.h"
#include "pdb.h"
#include "mix.h"
#include "sndfile.h"
#include "codec_types.h"
#include "codec.h"
#include "converter_types.h"
#include "converter.h"
#include "tonegen.h"
#define TONEGEN_MAGIC 0xdeebfeed
struct s_tonegen {
struct s_mixer *ms;
pdb_t *pdb;
pdb_entry_t *pdbe; /* spoof participant */
timestamp_t write_end; /* last time played */
uint8_t played; /* initialized indicator */
uint16_t tonefreq;
uint16_t toneamp;
uint32_t magic;
};
static const uint32_t TONEGEN_SSRC_ID = 0xefff0fff; /* 1 in 4 billion */
int
tonegen_create (tonegen_t **ppt,
struct s_mixer *ms,
struct s_pdb *pdb,
uint16_t tonefreq,
uint16_t toneamp)
{
tonegen_t *pt;
pdb_entry_t *pdbe;
if (pdb_item_create(pdb, 8000, TONEGEN_SSRC_ID) == FALSE ||
pdb_item_get(pdb, TONEGEN_SSRC_ID, &pdbe) == FALSE) {
debug_msg("tonegen could not create spoof participant\n");
return FALSE;
}
pt = (tonegen_t*)xmalloc(sizeof(tonegen_t));
if (pt == NULL) {
debug_msg("Could not allocate tonegen\n");
return FALSE;
}
*ppt = pt;
pt->ms = ms;
pt->pdb = pdb;
pt->pdbe = pdbe;
pt->played = 0;
pt->magic = TONEGEN_MAGIC;
pt->toneamp = toneamp;
pt->tonefreq = tonefreq;
return TRUE;
}
void
tonegen_destroy(tonegen_t **ppt)
{
tonegen_t *pt;
pt = *ppt;
assert(pt->magic == TONEGEN_MAGIC);
pdb_item_destroy(pt->pdb, TONEGEN_SSRC_ID);
xfree(pt);
*ppt = NULL;
}
int
tonegen_play(tonegen_t *pt, timestamp_t start, timestamp_t end)
{
timestamp_t delta, duration;
uint32_t samples, phase, i;
coded_unit src;
const mixer_info_t *mi;
sample *buf;
assert(ts_gt(start, end) == FALSE);
if (pt->played == 0) {
pt->write_end = end;
pt->played = 1;
}
delta = ts_sub(pt->write_end, end);
duration = ts_map32(8000, 1280);
if (!ts_gt(duration, delta)) {
/* No audio needs putting into mixer but return TRUE to */
/* indicate still active thought. */
return TRUE;
}
mi = mix_query(pt->ms);
duration = ts_convert(mi->sample_rate, duration);
samples = duration.ticks * mi->channels;
/* Initialize src for reading chunk of sound file */
src.id = codec_get_native_coding(mi->sample_rate, mi->channels);
src.state = NULL;
src.state_len = 0;
src.data_len = sizeof(sample) * samples;
src.data = (u_char*)block_alloc(src.data_len);
buf = (sample*)src.data;
phase = pt->write_end.ticks;
if (mi->channels == 1) {
for(i = 0; i < samples; i++) {
double t = pt->toneamp * sin(2 * M_PI * (phase + i) * pt->tonefreq / mi->sample_rate);
buf[i] = (sample)t;
}
} else {
for(i = 0; i < samples; i++) {
uint32_t j = i / mi->channels;
double t = pt->toneamp * sin(2 * M_PI * (phase + j) * pt->tonefreq / mi->sample_rate);
buf[i] = (sample)t;
}
}
xmemchk();
mix_put_audio(pt->ms, pt->pdbe, &src, pt->write_end);
codec_clear_coded_unit(&src);
pt->write_end = ts_add(pt->write_end, duration);
return TRUE;
}
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