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rxout.c
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// Copyright (c) <2012> <Leif Asbrink>
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without restriction,
// including without limitation the rights to use, copy, modify,
// merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
// OR OTHER DEALINGS IN THE SOFTWARE.
#include <string.h>
#include <fcntl.h>
#include "globdef.h"
#include "uidef.h"
#include "fft1def.h"
#include "fft2def.h"
#include "fft3def.h"
#include "screendef.h"
#include "sigdef.h"
#include "seldef.h"
#include "thrdef.h"
#include "txdef.h"
#include "options.h"
float iir3_gain[9]= {6.0,
31.55634919,
188.6646578,
1274.138623,
9304.588559,
70996.86308,
554452.4788,
4382011.796,
34842632.96
};
float iir3_c0[9]= {0.0,
0.1978251873,
0.4535459334,
0.6748018873,
0.8216600080,
0.9064815219,
0.9520967536,
0.9757549044,
0.9878031267
};
float iir3_c1[9]= { -0.3333333333,
-0.9103690003,
-1.7151178300,
-2.2889939150,
-2.6262484669,
-2.8084292678,
-2.9030250284,
-2.9512131915,
-2.9755315293
};
float iir3_c2[9]= { 0.0,
1.4590290622,
2.2191686183,
2.6079132760,
2.8037286680,
2.9018350649,
2.9509138462,
2.9754564614,
2.9877281729
};
void blocking_rxout(void)
{
int k, initial_n, sleep_cnt;
int local_workload_reset;
char s[80];
char cc;
float sleep_time, short_sleep_time;
float t1;
#if OSNUM == OSNUM_LINUX
clear_thread_times(THREAD_BLOCKING_RXOUT);
#endif
local_workload_reset=workload_reset_flag;
sleep_time=2000000./snd[RXDA].interrupt_rate;
if(sleep_time < 1010)sleep_time=1010;
if(sleep_time > 100000)sleep_time=100000;
short_sleep_time=0.2*sleep_time;
if(short_sleep_time > 10000)short_sleep_time=10000;
if(short_sleep_time < 1010)short_sleep_time=1010;
if(rx_daout_bytes == 1) {
cc=0x80;
} else {
cc=0;
}
lir_await_event(EVENT_BLOCKING_RXOUT);
daout_px=(daout_px-snd[RXDA].block_bytes+daout_size)&daout_bufmask;
memset(&daout[daout_px],cc,snd[RXDA].block_bytes);
// It may take a long time to return from the first write.
// 4Front OSS may require 0.1 second to set up the output
// Write data that will fill the soundcard with data for about
// 20 milliseconds (or more).
lir_rx_dawrite();
t1=0.5+.02*genparm[DA_OUTPUT_SPEED]/snd[RXDA].block_frames;
k=t1-1;
while(k>0) {
daout_px=(daout_px-snd[RXDA].block_bytes+daout_size)&daout_bufmask;
lir_rx_dawrite();
k--;
}
update_snd(RXDA);
thread_status_flag[THREAD_BLOCKING_RXOUT]=THRFLAG_ACTIVE;
sleep_cnt=0;
initial_n=2;
while(!kill_all_flag &&
thread_command_flag[THREAD_BLOCKING_RXOUT]==THRFLAG_ACTIVE) {
// *******************************************************
if(local_workload_reset!=workload_reset_flag) {
update_snd(RXDA);
snd[RXDA].min_valid_frames=snd[RXDA].tot_frames;
local_workload_reset=workload_reset_flag;
}
if( ((daout_pa-daout_px+daout_size)&daout_bufmask) >
initial_n*snd[RXDA].block_bytes) {
sleep_cnt=0;
if(audio_dump_flag==0 && rx_audio_out != -1) {
while(initial_n > 1) {
lir_rx_dawrite();
initial_n--;
}
while( ((daout_pa-daout_px+daout_size)&daout_bufmask) >
snd[RXDA].block_bytes) {
lir_rx_dawrite();
}
lir_sched_yield();
while( ((daout_pa-daout_px+daout_size)&daout_bufmask) >
snd[RXDA].block_bytes) {
lir_rx_dawrite();
}
} else {
daout_px=(daout_px+snd[RXDA].block_bytes)&daout_bufmask;
}
} else {
if(audio_dump_flag == 1 || rx_audio_out == -1) {
lir_sleep(sleep_time);
} else {
update_snd(RXDA);
if(snd[RXDA].valid_bytes > 8*snd[RXDA].block_bytes) {
lir_sleep(sleep_time);
goto loop_end;;
}
if(snd[RXDA].valid_bytes < snd[RXDA].block_bytes/4) {
if(count_rx_underrun_flag) {
no_of_rx_underrun_errors++;
sprintf(s,"RX%s%d",underrun_error_msg,no_of_rx_underrun_errors);
wg_error(s,WGERR_RXOUT);
}
// clear the buffer
daout_px=(daout_px-snd[RXDA].block_bytes+daout_size)&daout_bufmask;
memset(&daout[daout_px],cc,snd[RXDA].block_bytes);
lir_rx_dawrite();
lir_sleep(short_sleep_time);
} else {
sleep_cnt++;
if(sleep_cnt > 2)lir_sleep(short_sleep_time);
}
}
}
loop_end:
;
}
thread_status_flag[THREAD_BLOCKING_RXOUT]=THRFLAG_RETURNED;
while(!kill_all_flag &&
thread_command_flag[THREAD_BLOCKING_RXOUT] != THRFLAG_NOT_ACTIVE) {
lir_sleep(1000);
}
}
#define MAXMAIL 5
void rx_output(void)
{
char delay_margin_flag;
char cc, blocking;
float dasync_time_interval;
int da_start_bytes;
int dasync_errors;
int daout_py;
int i, k;
int speed_cnt_maxval;
char s[80];
double dt1;
int local_channels, local_bytes;
int local_workload_reset;
int speed_cnt;
float local_fft3_blocktime;
float t1, t2;
float sleep_time;
double total_time2;
double daspeed_time;
#if OSNUM == OSNUM_LINUX
clear_thread_times(THREAD_RX_OUTPUT);
#endif
blocking=TRUE;
if( (ui.use_alsa&PORTAUDIO_RX_OUT) != 0) {
blocking=FALSE;
}
thread_status_flag[THREAD_RX_OUTPUT]=THRFLAG_ACTIVE;
local_channels=rx_daout_channels;
local_bytes=rx_daout_bytes;
local_fft3_blocktime=fft3_blocktime;
daout_pa=0;
daout_px=0;
count_rx_underrun_flag=FALSE;
sys_func(THRFLAG_OPEN_RX_SNDOUT);
snd[RXDA].open_flag=CALLBACK_CMD_ACTIVE;
if(rx_audio_out == -1)blocking=FALSE;
if(kill_all_flag)goto da_output_error;
if(blocking && audio_dump_flag == 0 && rx_audio_out >= 0) {
lir_rx_dawrite();
daout_pa=0;
daout_px=0;
}
dasync_errors=0;
baseb_output_block=128;
da_start_bytes=-1;
thread_command_flag[THREAD_BLOCKING_RXOUT]=THRFLAG_NOT_ACTIVE;
if(blocking) {
lir_init_event(EVENT_BLOCKING_RXOUT);
lir_sched_yield();
linrad_thread_create(THREAD_BLOCKING_RXOUT);
}
while(!kill_all_flag &&
thread_command_flag[THREAD_RX_OUTPUT]==THRFLAG_ACTIVE) {
lir_sleep(3000);
}
speed_cnt_maxval=0.2*snd[RXDA].interrupt_rate;
goto stop_output;
resume:
;
if(blocking) {
lir_init_event(EVENT_BLOCKING_RXOUT);
lir_sched_yield();
linrad_thread_create(THREAD_BLOCKING_RXOUT);
}
if(rxda_status != LIR_OK) {
wg_error("Output soundcard disabled",WGERR_SOUNDCARD);
}
thread_status_flag[THREAD_RX_OUTPUT]=THRFLAG_ACTIVE;
count_rx_underrun_flag=FALSE;
lir_sched_yield();
sleep_time=1000000./snd[RXDA].interrupt_rate;
if(sleep_time < 1010)sleep_time=1010;
if(sleep_time > 100000)sleep_time=100000;
dasync_time_interval=(float)(7*fft3_size)/timf3_sampling_speed;
if(dasync_time_interval < (float)(7*fft1_size)/timf1_sampling_speed)
dasync_time_interval = (float)(7*fft1_size)/timf1_sampling_speed;
if(genparm[SECOND_FFT_ENABLE]!=0) {
if(dasync_time_interval < (float)(7*fft2_size)/timf1_sampling_speed)
dasync_time_interval = (float)(7*fft2_size)/timf1_sampling_speed;
}
if(dasync_time_interval < 0.5)dasync_time_interval=0.5;
local_workload_reset=workload_reset_flag;
speed_cnt=snd[RXDA].interrupt_rate;
baseb_output_block=snd[RXDA].block_bytes/(2*da_resample_ratio);
if(baseb_output_block < 16)baseb_output_block=16;
baseb_min_block=1+1/da_resample_ratio;
if(baseb_min_block < baseb_output_block/16) {
baseb_min_block=baseb_output_block/16;
}
k=0;
dasync_time=current_time();
daspeed_time=dasync_time;
await_narrowband_processing:
;
if(kill_all_flag) goto da_output_error;
if(thread_command_flag[THREAD_RX_OUTPUT] != THRFLAG_ACTIVE)goto stop_output;
lir_sleep(2000);
update_snd(RXDA);
make_timing_info();
if(kill_all_flag) goto da_output_error;
if(thread_command_flag[THREAD_RX_OUTPUT] != THRFLAG_ACTIVE)goto stop_output;
t1=total_wttim-da_wait_time;
if(t1 < 0) {
goto await_narrowband_processing;
}
if(k == 0 && blocking) {
lir_set_event(EVENT_BLOCKING_RXOUT);
lir_sched_yield();
update_snd(RXDA);
make_timing_info();
}
k++;
if(t1*baseband_sampling_speed > 3*baseb_output_block) {
i=t1*baseband_sampling_speed;
if(i > baseb_wts)i=baseb_wts;
baseb_py=(baseb_py+i+baseband_size)&baseband_mask;
baseb_wts-=i;
}
lir_sched_yield();
update_snd(RXDA);
make_timing_info();
if(kill_all_flag) goto da_output_error;
if(thread_command_flag[THREAD_RX_OUTPUT] != THRFLAG_ACTIVE)goto stop_output;
t1=total_wttim-da_wait_time;
if(t1*baseband_sampling_speed > 3*baseb_output_block ) { //|| k<2)
if(recent_time-dasync_time > 2) {
lirerr(1199);
goto da_output_error;
}
goto await_narrowband_processing;
}
if(blocking && thread_status_flag[THREAD_BLOCKING_RXOUT] != THRFLAG_ACTIVE) {
goto await_narrowband_processing;
}
baseb_fx=(baseb_py-2+baseband_size)&baseband_mask;
if(da_start_bytes == -1) {
dasync_counter=0;
dasync_sum=0;
dasync_avg1=-1.5;
dasync_avg2=-1.5;
dasync_avg3=-1.5;
dasync_time=current_time();
dasync_avgtime=dasync_time;
daspeed_time=dasync_time+1;
}
daout_pa=0;
daout_px=0;
daout_py=0;
snd[RXDA].min_valid_frames=snd[RXDA].tot_frames;
min_daout_samps=baseband_size;
delay_margin_flag=TRUE;
lir_sleep(1000);
make_timing_info();
update_snd(RXDA);
if(kill_all_flag) goto da_output_error;
if(thread_command_flag[THREAD_RX_OUTPUT] != THRFLAG_ACTIVE)goto stop_output;
t1=total_wttim-da_wait_time;
if(t1*baseband_sampling_speed > 3*baseb_output_block ) { //|| k<2)
goto await_narrowband_processing;
}
while(!kill_all_flag &&
thread_command_flag[THREAD_RX_OUTPUT] == THRFLAG_ACTIVE) {
// We use speed_cnt to avoid using a lot of CPU time on this code section.
if(audio_dump_flag==0)speed_cnt--;
if(speed_cnt==0) {
if(delay_margin_flag) {
snd[RXDA].min_valid_frames=snd[RXDA].tot_frames;
min_daout_samps=baseband_size;
delay_margin_flag=FALSE;
}
if(local_workload_reset!=workload_reset_flag) {
snd[RXDA].min_valid_frames=snd[RXDA].tot_frames;
local_workload_reset=workload_reset_flag;
}
speed_cnt=speed_cnt_maxval;
total_time2=recent_time;
if(recent_time-daspeed_time > 0) {
// Compute the D/A speed and once every second.
if(audio_dump_flag==0) {
daspeed_time=recent_time+1;
lir_sched_yield();
if(da_start_bytes == -1) {
da_start_time=total_time2;
da_block_counter=0;
da_start_bytes=snd[RXDA].empty_bytes;
snd[RXDA].min_valid_frames=snd[RXDA].tot_frames;
count_rx_underrun_flag=TRUE;
} else {
measured_da_speed=(da_block_counter*snd[RXDA].block_bytes+
snd[RXDA].empty_bytes-da_start_bytes)/
(snd[RXDA].framesize*(total_time2-da_start_time));
}
}
// Keep track of the error in the frequency ratio between input and output.
// Average the total processing delay and adjust resampling rate to
// keep it constant.
#define DASYNC_MAXCOUNT 15 //Number of seconds used to form average
dt1=current_time();
if( diskread_flag == 0 &&
new_baseb_flag == 0 &&
dt1-dasync_avgtime > dasync_time_interval &&
rx_audio_out != -1) {
dasync_avgtime=dt1;
lir_sched_yield();
make_timing_info();
if(kill_all_flag) goto da_output_error;
if(timinfo_flag != 0) {
sprintf(s,"sync:%f ",total_wttim-dasync_avg3);
lir_text(26,screen_last_line-8,s);
}
if(dasync_avg3 >= 0 && fabs(total_wttim-dasync_avg3)>0.5) {
dasync_errors++;
sprintf(s,"DA SYNC ERRORS %d",dasync_errors);
wg_error(s,WGERR_DASYNC);
baseb_reset_counter++;
da_start_bytes=-1;
dasync_counter=0;
}
dasync_counter++;
dasync_sum+=total_wttim;
if(dasync_counter >= DASYNC_MAXCOUNT) {
dasync_avg1=dasync_sum/dasync_counter;
dasync_counter=0;
dasync_sum=0;
t2=dt1-dasync_time;
dasync_time=dt1;
if(dasync_avg2 > 0) {
// The drift between input and output after t2 seconds is
// the difference between the two averages.
// Convert to frequency ratio, but use half the error only
// to avoid oscillations.
// Correct for the deviation from the first average, but only 20%
// so we drift slowy towards it if we are off.
// also add 5% of the time deviation from the ideal time.
t1= (t2+0.5*(dasync_avg2-dasync_avg1)+
0.2*(dasync_avg3-dasync_avg1))/t2;
// dasync_avg3=0.9*dasync_avg3+0.1*da_wait_time;
new_da_resample_ratio=da_resample_ratio*t1;
dasync_avg2=dasync_avg1;
} else {
if(dasync_avg3 <0) {
dasync_avg3=dasync_avg1;
} else {
dasync_avg2=dasync_avg1;
}
}
}
}
if(thread_command_flag[THREAD_RX_OUTPUT] !=
THRFLAG_ACTIVE)goto stop_output;
}
}
// ***********************************************************
lir_sched_yield();
if( ((baseb_pa-baseb_py+baseband_size)&baseband_mask) > baseb_output_block ) {
if( ((daout_px-snd[RXDA].block_bytes-daout_pa+daout_size)&daout_bufmask) > (daout_size>>1) ) {
make_audio_signal();
} else {
if(audio_dump_flag==0)lir_sleep(sleep_time);
}
}
lir_sched_yield();
if( ((baseb_pa-baseb_py+baseband_size)&baseband_mask) <= baseb_output_block ) {
lir_await_event(EVENT_BASEB);
}
if(kill_all_flag) goto da_output_error;
if(thread_command_flag[THREAD_RX_OUTPUT] != THRFLAG_ACTIVE)goto stop_output;
if(audio_dump_flag == 1 || rx_audio_out == -1) {
while( ((daout_pa-daout_px+daout_size)&daout_bufmask) >
snd[RXDA].block_bytes) {
daout_px=(daout_px+snd[RXDA].block_bytes)&daout_bufmask;
if(kill_all_flag) goto da_output_error;
if(thread_command_flag[THREAD_RX_OUTPUT] != THRFLAG_ACTIVE)goto stop_output;
}
lir_sched_yield();
if(kill_all_flag) goto da_output_error;
if(thread_command_flag[THREAD_RX_OUTPUT] != THRFLAG_ACTIVE)goto stop_output;
}
while(daout_px != daout_py) {
if(wav_write_flag != 0) {
if(wavfile_squelch_flag == 0 || squelch_on) {
if(fwrite(&daout[daout_py],snd[RXDA].block_bytes,1,wav_file)!=1)
wavsave_start_stop(0);
}
}
da_block_counter+=1;
daout_py=(daout_py+snd[RXDA].block_bytes)&daout_bufmask;
if(kill_all_flag) goto da_output_error;
if(thread_command_flag[THREAD_RX_OUTPUT] != THRFLAG_ACTIVE)goto stop_output;
}
#if BUFBARS == TRUE
if(baseband_handle != NULL && timinfo_flag!=0) {
i=(daout_pa+2-daout_px+daout_bufmask+1)&daout_bufmask;
i/=daout_indicator_block;
show_bufbar(RX_BUFBAR_DAOUT,i);
}
#endif
}
stop_output:
;
if(blocking) {
lir_set_event(EVENT_BLOCKING_RXOUT);
linrad_thread_stop_and_join(THREAD_BLOCKING_RXOUT);
lir_close_event(EVENT_BLOCKING_RXOUT);
}
daout_px=0;
daout_pa=0;
daout_py=0;
if(thread_command_flag[THREAD_RX_OUTPUT] == THRFLAG_IDLE) {
if(rx_audio_out >= 0)lir_empty_da_device_buffer();
thread_status_flag[THREAD_RX_OUTPUT] = THRFLAG_IDLE;
lir_sleep(10000);
while(thread_command_flag[THREAD_RX_OUTPUT] == THRFLAG_IDLE) {
lir_sleep(5000);
if(kill_all_flag) goto da_output_error;
}
daout_px=0;
daout_pa=0;
while(thread_command_flag[THREAD_RX_OUTPUT] == THRFLAG_SEMCLEAR) {
thread_status_flag[THREAD_RX_OUTPUT] = THRFLAG_SEMCLEAR;
lir_await_event(EVENT_RX_START_DA);
if(kill_all_flag) goto da_output_error;
}
if(thread_command_flag[THREAD_RX_OUTPUT] == THRFLAG_ACTIVE) {
if( rx_audio_out != -1 && (local_channels != rx_daout_channels ||
local_bytes != rx_daout_bytes ||
local_fft3_blocktime != fft3_blocktime)) {
sys_func(THRFLAG_CLOSE_RX_SNDOUT);
lir_sched_yield();
if(rx_daout_bytes == 1) {
cc=0x80;
} else {
cc=0;
}
daout_px=0;
daout_pa=0;
memset(&daout[daout_px],cc,snd[RXDA].block_bytes);
sys_func(THRFLAG_OPEN_RX_SNDOUT);
if(kill_all_flag || rxda_status != LIR_OK) goto da_output_error;
lir_empty_da_device_buffer();
snd[RXDA].open_flag=CALLBACK_CMD_ACTIVE;
da_start_bytes=-1;
local_channels=rx_daout_channels;
local_bytes=rx_daout_bytes;
local_fft3_blocktime=fft3_blocktime;
}
if(kill_all_flag) goto da_output_error;
goto resume;
}
}
da_output_error:
;
count_rx_underrun_flag=FALSE;
if(blocking && thread_command_flag[THREAD_BLOCKING_RXOUT] != THRFLAG_NOT_ACTIVE) {
linrad_thread_stop_and_join(THREAD_BLOCKING_RXOUT);
}
if(rx_audio_out >= 0) {
/*
if( (ui.use_alsa&(PORTAUDIO_TX_IN+PORTAUDIO_RX_OUT)) == 0)
{
while( rx_audio_out == tx_audio_in)lir_sleep(10000);
}
// Perhaps when using OSS in RDWR mode???
*/
sys_func(THRFLAG_CLOSE_RX_SNDOUT);
}
thread_status_flag[THREAD_RX_OUTPUT]=THRFLAG_RETURNED;
while(thread_command_flag[THREAD_RX_OUTPUT] != THRFLAG_NOT_ACTIVE &&
thread_command_flag[THREAD_RX_OUTPUT] != THRFLAG_KILL) {
lir_sleep(1000);
}
}
void make_audio_signal(void)
{
int i, k, i1, i2, i3, i4, mm, nn;
float t1, t2, t3, t4, t5, t6, t7;
float a1, a2, b1, b2, u1, u2;
double dt1;
short int *intvar;
float r1,r2,r3,r4;
float rdiff, final_gain1, final_gain2;
float baseb_r1, baseb_r2;
int loop_counter;
if(ui.tx_enable != 0) {
dt1=(2*PI_L*(double)txcw.sidetone_freq)/genparm[DA_OUTPUT_SPEED];
sidetone_phstep_cos=cos(dt1);
sidetone_phstep_sin=sin(dt1);
dt1=sqrt(sidetone_cos*sidetone_cos+sidetone_sin*sidetone_sin);
sidetone_cos*=txcw.sidetone_ampl/dt1;
sidetone_sin*=txcw.sidetone_ampl/dt1;
}
i=1;
if(bg_filter_points > 5 && 2*bg_filter_points < bg_xpoints) {
if(bg.squelch_level !=0) {
if(recent_time-squelch_turnon_time > bg.squelch_time+0.1) {
i=0;
}
}
}
squelch_on=i;
// Resample the baseband signal so we get the correct sampling speed
// for the D/A converter.
// For each interval in baseb_out there is a non integer number of points
// in da_output.
dt1=1/sqrt(rx_daout_sin*rx_daout_sin+rx_daout_cos*rx_daout_cos);
rx_daout_sin*=dt1;
rx_daout_cos*=dt1;
final_gain1=final_gain2=0;
mm=snd[RXDA].framesize;
nn=2*baseb_channels;
baseb_r1=daout_pa/(mm*da_resample_ratio);
loop_counter=0;
resamp:
;
baseb_r2=(daout_pa+mm)/(mm*da_resample_ratio);
i2=baseb_fx+baseb_r1+.5;
if(baseb_r2>baseb_r1) {
i3=baseb_fx+baseb_r2+.5;
} else {
i3=baseb_fx+baseb_r2+.5+daout_size/da_resample_ratio;
}
i2&=baseband_mask;
i3&=baseband_mask;
if(abs(i3-i2) > 1) {
i2=baseb_fx+(baseb_r1+baseb_r2)/2;
i3=i2+1;
i2&=baseband_mask;
i3&=baseband_mask;
} else {
if(i3==i2) {
i2=baseb_fx+baseb_r1;
i2&=baseband_mask;
if(i3==i2) {
i3=i2+1;
i3&=baseband_mask;
}
}
}
i4=(i3+1)&baseband_mask;
baseb_py=i4;
i1=(i2+baseband_mask)&baseband_mask;
baseb_wts=baseb_pa-baseb_r2-baseb_fx;
if(baseb_wts<0)baseb_wts+=baseband_size;
loop_counter++;
if(loop_counter > 2*baseb_output_block)lir_sched_yield();
if( ((daout_pa-daout_px+daout_size)&daout_bufmask) > (daout_size>>1) ||
((baseb_pa-baseb_py+baseband_size)&baseband_mask) < baseb_min_block) {
return;
}
rdiff=baseb_r1+baseb_fx-i2;
if(rdiff > baseband_size/2) {
rdiff-=baseband_size;
}
// Use Lagrange's interpolation formula to fit a third degree
// polynomial to 4 points:
// a1=-rdiff * (rdiff-1)*(rdiff-2)*baseb_out[nn*i1]/6
// +(rdiff+1)*(rdiff-1)*(rdiff-2)*baseb_out[nn*i2]/2
// -(rdiff+1)* rdiff *(rdiff-2)*baseb_out[nn*i3]/2
// +(rdiff+1)* rdiff *(rdiff-1)*baseb_out[nn*i4]/6;
// Rewrite slightly to save a few multiplications - do not
// think the compiler is smart enough to do it for us.
t1=rdiff-1;
t2=rdiff-2;
t3=rdiff+1;
t4=t1*t2;
t5=t3*rdiff;
t6=rdiff*t4;
t4=t3*t4;
t7=t5*t2;
t5=t5*t1;
final_gain1=daout_gain;
final_gain2=daout_gain;
if(bg.agc_flag == 1) {
if( daout_gain*baseb_agc_level[i2] > bg_agc_amplimit) {
final_gain1=bg_agc_amplimit/baseb_agc_level[i2];
final_gain2=final_gain1;
}
}
if(bg.agc_flag == 2) {
if( daout_gain*baseb_agc_level[2*i2] > bg_agc_amplimit) {
final_gain1=bg_agc_amplimit/baseb_agc_level[2*i2];
}
if( daout_gain*baseb_agc_level[2*i2+1] > bg_agc_amplimit) {
final_gain2=bg_agc_amplimit/baseb_agc_level[2*i2+1];
}
}
if(squelch_on == 0) {
final_gain1=0;
final_gain2=0;
}
a1=final_gain1*(((t5*baseb_out[nn*i4 ]-t6*baseb_out[nn*i1 ])/3
+t4*baseb_out[nn*i2 ]-t7*baseb_out[nn*i3 ])/2);
a2=final_gain1*(((t5*baseb_out[nn*i4+1]-t6*baseb_out[nn*i1+1])/3
+t4*baseb_out[nn*i2+1]-t7*baseb_out[nn*i3+1])/2);
if(enable_resamp_iir5) {
xva1[0]=xva1[1];
xva1[1]=xva1[2];
xva1[2]=xva1[3];
xva1[3]=xva1[4];
xva1[4]=xva1[5];
xva1[5]=a1/iir_a.gain;
yva1[0]=yva1[1];
yva1[1]=yva1[2];
yva1[2]=yva1[3];
yva1[3]=yva1[4];
yva1[4]=yva1[5];
yva1[5]=xva1[0]+xva1[5]+5*(xva1[1]+xva1[4])+10*(xva1[2]+xva1[3])+
iir_a.c0*yva1[0]+iir_a.c1*yva1[1]+iir_a.c2*yva1[2]+
iir_a.c3 * yva1[3]+iir_a.c4*yva1[4];
a1=yva1[5];
xva2[0]=xva2[1];
xva2[1]=xva2[2];
xva2[2]=xva2[3];
xva2[3]=xva2[4];
xva2[4]=xva2[5];
xva2[5]=a2/iir_a.gain;
yva2[0]=yva2[1];
yva2[1]=yva2[2];
yva2[2]=yva2[3];
yva2[3]=yva2[4];
yva2[4]=yva2[5];
yva2[5]=xva2[0]+xva2[5]+5*(xva2[1] + xva2[4])+10*(xva2[2]+xva2[3])+
iir_a.c0*yva2[0]+iir_a.c1*yva2[1]+iir_a.c2*yva2[2]+
iir_a.c3*yva2[3]+iir_a.c4*yva2[4];
a2=yva2[5];
}
old_out1=out1;
old_out2=out2;
if(baseb_channels == 1) {
if(rx_mode == MODE_FM) {
out1=a1;
out2=a2;
// ************************************
t1=(out1-old_out1)/daout_upsamp;
t2=old_out1;
t3=(out2-old_out2)/daout_upsamp;
t4=old_out2;
for(i=0; i<daout_upsamp; i++) {
xv1[0]=xv1[1];
xv1[1]=xv1[2];
xv1[2]=xv1[3];
xv1[3]=t2/iir3_gain[daout_upsamp_n];
yv1[0]=yv1[1];
yv1[1]=yv1[2];
yv1[2]=yv1[3];
yv1[3]=xv1[0]+xv1[3]+3*(xv1[1]+xv1[2])+
iir3_c0[daout_upsamp_n]*yv1[0]+
iir3_c1[daout_upsamp_n]*yv1[1]+
iir3_c2[daout_upsamp_n]*yv1[2];
a1 = yv1[3];
xv2[0]=xv2[1];
xv2[1]=xv2[2];
xv2[2]=xv2[3];
xv2[3]=t4/iir3_gain[daout_upsamp_n];
yv2[0]=yv2[1];
yv2[1]=yv2[2];
yv2[2]=yv2[3];
yv2[3]=xv2[0]+xv2[3]+3*(xv2[1]+xv2[2])+
iir3_c0[daout_upsamp_n]*yv2[0]+
iir3_c1[daout_upsamp_n]*yv2[1]+
iir3_c2[daout_upsamp_n]*yv2[2];
a2 = yv2[3];
if(a1 < -bg_amplimit)a1=-bg_amplimit;
if(a1 > bg_amplimit)a1=bg_amplimit;
if(bg_maxamp < fabs(a1))bg_maxamp=fabs(a1);
if(a2 < -bg_amplimit)a2=-bg_amplimit;
if(a2 > bg_amplimit)a2=bg_amplimit;
if(bg_maxamp < fabs(a2))bg_maxamp=fabs(a2);
if(ptt_state == FALSE) {
if(rx_daout_bytes == 1) {
daout[daout_pa]=0x80+a1;
if(rx_daout_channels == 2)daout[daout_pa+1]=0x80+a2;
} else {
intvar=(short int*)(&daout[daout_pa]);
intvar[0]=a1;
if(rx_daout_channels == 2)intvar[1]=a2;
}
} else {
dt1=sidetone_cos;
sidetone_cos=sidetone_cos*sidetone_phstep_cos+
sidetone_sin*sidetone_phstep_sin;
sidetone_sin=sidetone_sin*sidetone_phstep_cos-
dt1*sidetone_phstep_sin;
if(rx_daout_bytes == 1) {
k=(int)(sidetone_cos*0x7e/1000.);
daout[daout_pa]=0x80+k;
if(rx_daout_channels == 2)daout[daout_pa+1]=0x80+k;
} else {
intvar=(short int*)(&daout[daout_pa]);
intvar[0]=(int)(sidetone_cos*0x7ffe/1000.);
if(rx_daout_channels == 2)intvar[1]=intvar[0];
}
}
daout_pa=(daout_pa+mm)&daout_bufmask;
t2+=t1;
t4+=t3;
}
} else {
if(bg_expand != 2) {
t1=sqrt(a1*a1+a2*a2);
if(t1 > 0.5) {
if(t1<bg_amplimit)t2=t1;
else t2=bg_amplimit;
if(bg_expand == 1)t2=bg_expand_a*(exp(bg_expand_b*t2)-1);
t2/=t1;
out1=t2*a1;
out2=t2*a2;
} else {
out1=0;
out2=0;
}
} else {
out1=a1;
out2=a2;
}
t1=(out1-old_out1)/daout_upsamp;
t2=old_out1;
t3=(out2-old_out2)/daout_upsamp;
t4=old_out2;
for(i=0; i<daout_upsamp; i++) {
dt1=rx_daout_cos;
rx_daout_cos=rx_daout_cos*rx_daout_phstep_cos+
rx_daout_sin*rx_daout_phstep_sin;
rx_daout_sin=rx_daout_sin*rx_daout_phstep_cos-
dt1*rx_daout_phstep_sin;
xv1[0]=xv1[1];
xv1[1]=xv1[2];
xv1[2]=xv1[3];
xv1[3]=t2/iir3_gain[daout_upsamp_n];
yv1[0]=yv1[1];
yv1[1]=yv1[2];
yv1[2]=yv1[3];
yv1[3]=xv1[0]+xv1[3]+3*(xv1[1]+xv1[2])+
iir3_c0[daout_upsamp_n]*yv1[0]+
iir3_c1[daout_upsamp_n]*yv1[1]+
iir3_c2[daout_upsamp_n]*yv1[2];
a1 = yv1[3];
xv2[0]=xv2[1];
xv2[1]=xv2[2];
xv2[2]=xv2[3];
xv2[3]=t4/iir3_gain[daout_upsamp_n];
yv2[0]=yv2[1];
yv2[1]=yv2[2];
yv2[2]=yv2[3];
yv2[3]=xv2[0]+xv2[3]+3*(xv2[1]+xv2[2])+
iir3_c0[daout_upsamp_n]*yv2[0]+
iir3_c1[daout_upsamp_n]*yv2[1]+
iir3_c2[daout_upsamp_n]*yv2[2];
a2 = yv2[3];
u1= a1*rx_daout_cos+a2*rx_daout_sin;
if(u1 > bg_amplimit)u1=bg_amplimit;
if(u1 < -bg_amplimit)u1=-bg_amplimit;
if(bg_maxamp < fabs(u1))bg_maxamp=fabs(u1);
if(da_ch2_sign == 0) {
u2=-a1*rx_daout_sin+a2*rx_daout_cos;
if(u2 > bg_amplimit)u2=bg_amplimit;
if(u2 < -bg_amplimit)u2=-bg_amplimit;
if(bg_maxamp < fabs(u2))bg_maxamp=fabs(u2);
if(ptt_state == FALSE) {
if(rx_daout_bytes == 1) {
daout[daout_pa ]=0x80+u1;
daout[daout_pa+1]=0x80+u2;
} else {
intvar=(short int*)(&daout[daout_pa]);
intvar[0]=u1;
intvar[1]=u2;
}
} else {
dt1=sidetone_cos;
sidetone_cos=sidetone_cos*sidetone_phstep_cos+
sidetone_sin*sidetone_phstep_sin;
sidetone_sin=sidetone_sin*sidetone_phstep_cos-
dt1*sidetone_phstep_sin;
if(rx_daout_bytes == 1) {
k=(int)(sidetone_cos*0x7e/1000.);
daout[daout_pa]=0x80+k;
if(rx_daout_channels == 2)daout[daout_pa+1]=0x80+k;
} else {
intvar=(short int*)(&daout[daout_pa]);
intvar[0]=(int)(sidetone_cos*0x7ffe/1000.);
if(rx_daout_channels == 2)intvar[1]=intvar[0];
}
}
} else {
if(ptt_state == FALSE) {
if(rx_daout_bytes == 1) {
daout[daout_pa]=0x80+u1;
if(rx_daout_channels == 2)daout[daout_pa+1]=0x80+u1*da_ch2_sign;
} else {
intvar=(short int*)(&daout[daout_pa]);
intvar[0]=u1;
if(rx_daout_channels == 2)intvar[1]=u1*da_ch2_sign;
}
} else {
dt1=sidetone_cos;
sidetone_cos=sidetone_cos*sidetone_phstep_cos+
sidetone_sin*sidetone_phstep_sin;
sidetone_sin=sidetone_sin*sidetone_phstep_cos-
dt1*sidetone_phstep_sin;
if(rx_daout_bytes == 1) {
k=(int)(sidetone_cos*0x7e/1000.);
daout[daout_pa]=0x80+k;
if(rx_daout_channels == 2)daout[daout_pa+1]=0x80+k;
} else {
intvar=(short int*)(&daout[daout_pa]);
intvar[0]=(int)(sidetone_cos*0x7ffe/1000.);
if(rx_daout_channels == 2)intvar[1]=intvar[0];
}
}
}
daout_pa=(daout_pa+mm)&daout_bufmask;
t2+=t1;
t4+=t3;
}
}
} else {
old_out3=out3;
old_out4=out4;
b1=final_gain2*(((t5*baseb_out[nn*i4+2]-t6*baseb_out[nn*i1+2])/3
+t4*baseb_out[nn*i2+2]-t7*baseb_out[nn*i3+2])/2);
b2=final_gain2*(((t5*baseb_out[nn*i4+3]-t6*baseb_out[nn*i1+3])/3
+t4*baseb_out[nn*i2+3]-t7*baseb_out[nn*i3+3])/2);
if(enable_resamp_iir5) {
xvb1[0]=xvb1[1];
xvb1[1]=xvb1[2];
xvb1[2]=xvb1[3];
xvb1[3]=xvb1[4];
xvb1[4]=xvb1[5];
xvb1[5]=b1/iir_a.gain;
yvb1[0]=yvb1[1];
yvb1[1]=yvb1[2];
yvb1[2]=yvb1[3];
yvb1[3]=yvb1[4];
yvb1[4]=yvb1[5];
yvb1[5]=xvb1[0]+xvb1[5]+5*(xvb1[1]+xvb1[4])+10*(xvb1[2]+xvb1[3])+
iir_a.c0*yvb1[0]+iir_a.c1*yvb1[1]+iir_a.c2*yvb1[2]+
iir_a.c3 * yvb1[3]+iir_a.c4*yvb1[4];
b1=yvb1[5];
xvb2[0]=xvb2[1];
xvb2[1]=xvb2[2];
xvb2[2]=xvb2[3];
xvb2[3]=xvb2[4];
xvb2[4]=xvb2[5];
xvb2[5]=b2/iir_a.gain;
yvb2[0]=yvb2[1];
yvb2[1]=yvb2[2];
yvb2[2]=yvb2[3];
yvb2[3]=yvb2[4];
yvb2[4]=yvb2[5];
yvb2[5]=xvb2[0]+xvb2[5]+5*(xvb2[1] + xvb2[4])+10*(xvb2[2]+xvb2[3])+
iir_a.c0*yvb2[0]+iir_a.c1*yvb2[1]+iir_a.c2*yvb2[2]+
iir_a.c3*yvb2[3]+iir_a.c4*yvb2[4];
b2=yvb2[5];
}
if( (bg_expand != 2 && bg.agc_flag != 2 ) || bg_twopol != 0) {
t1=a1*a1+a2*a2;
t2=b1*b1+b2*b2;
if(t1 < t2)t1=t2;
t1=sqrt(t1);
if(t1 > 0.5) {
if(t1<bg_amplimit)t2=t1;
else t2=bg_amplimit;
if(bg_expand == 1)t2=bg_expand_a*(exp(bg_expand_b*t2)-1);
if(bg_maxamp < t2)bg_maxamp=t2;
t2/=t1;
out1=t2*a1;
out2=t2*a2;
out3=t2*b1;
out4=t2*b2;
} else {
out1=0;
out2=0;
out3=0;
out4=0;
}
} else {
out1=a1;
out2=a2;
out3=b1;
out4=b2;
}
// ************************************
t1=(out1-old_out1)/daout_upsamp;
t2=old_out1;
t3=(out2-old_out2)/daout_upsamp;
t4=old_out2;
r1=(out3-old_out3)/daout_upsamp;
r2=old_out3;
r3=(out4-old_out4)/daout_upsamp;
r4=old_out4;
for(i=0; i<daout_upsamp; i++) {
dt1=rx_daout_cos;
rx_daout_cos=rx_daout_cos*rx_daout_phstep_cos+
rx_daout_sin*rx_daout_phstep_sin;
rx_daout_sin=rx_daout_sin*rx_daout_phstep_cos-
dt1*rx_daout_phstep_sin;
xv1[0]=xv1[1];
xv1[1]=xv1[2];
xv1[2]=xv1[3];
xv1[3]=t2/iir3_gain[daout_upsamp_n];
yv1[0]=yv1[1];
yv1[1]=yv1[2];
yv1[2]=yv1[3];
yv1[3]=xv1[0]+xv1[3]+3*(xv1[1]+xv1[2])+
iir3_c0[daout_upsamp_n]*yv1[0]+
iir3_c1[daout_upsamp_n]*yv1[1]+