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- /* $Id: ath.c,v 1.12 2000/12/05 15:37:26 aleidinger Exp $ */
- /*
- * Known bugs (sorted by importance):
- * - human delay (ca. 200 ms or more???) and buffering delay (341 ms @48 kHz/64 KByte)
- * should be subtracted
- * - error handling
- * - cos slope on direction changes
- * - calibration file of soundcard/amplifier/head phone
- * - worse handling
- * - +/- handling via mouse (do you have code?) in a dark room
- * - ENTER as direction change
- * - finer precalculated ATH for pre-emphasis
- */
-
- /*
- * Suggested level ranges:
- * 180 Hz...13.5 kHz: 50...70 dB
- * 100 Hz...15.0 kHz: 40...70 dB
- * 70 Hz...16.0 kHz: 30...70 dB
- * 45 Hz...16.5 kHz: 20...70 dB
- * 30 Hz...17.5 kHz: 10...70 dB
- * 25 Hz...18.0 kHz: 5...75 dB
- * 20 Hz...19.0 kHz: 0...80 dB
- * 16 Hz...20.0 kHz: -10...80 dB
- */
-
- #ifdef HAVE_CONFIG_H
- # include <config.h>
- #endif
-
- #include <assert.h>
- #include <errno.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <string.h>
- #include <fcntl.h>
- #include <limits.h>
- #include <termios.h>
- #include <math.h>
- #include <time.h>
- #include <signal.h>
- #include <sys/ioctl.h>
- #include <sys/time.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #ifdef HAVE_SYS_SOUNDCARD_H
- # include <sys/soundcard.h>
- #elif defined(HAVE_LINUX_SOUNDCARD_H)
- # include <linux/soundcard.h>
- #else
- # error no soundcard include
- #endif
-
-
-
- #define AUDIO_DEVICE "/dev/dsp"
- //#define COOLEDIT_FILE "/mnt/dosd/cooledit.wav"
- #define DELAY_UNTIL_XCHG 2.5
- #define TURN_STEPS 2400
-
- /******************************************************************************************************
- * soundcard stuff
- ******************************************************************************************************/
-
- const double dither_coeff [] [16] = {
- { /* 48 kHz */ 3.35185352775391591311, 4.24914379295482032978, 1.78042251729150153086, -0.92601381419186201184, -1.37308596104182343645, -1.85951915999247704829, -3.28074437872632330526, -3.05496670185702990882, -1.22855462839450528837, -0.30291531959171267015, -0.18598486195652600770, 0.42010512205702003790, 0.92278786111368653452, 0.62102380451771775193, 0.14312897206650044828, -0.00454721508203927746 },
- { /* 56 kHz */ 3.86404134982280628749, 6.67195592701613291071, 5.90576195467245802046, 1.57589705921487261981, -2.10618201389737372178, -2.74191788822507184395, -2.62175070636849999396, -3.78505226463032808863, -4.45698848578010438284, -2.76825966243460536110, -0.26509931375584007312, 0.67853812028968716799, 0.17633528441477021892, -0.28511417191837823770, -0.21866605100975608470, -0.04751674094456833719 },
- { /* 64 kHz */ 4.09276938880098092172, 8.27424044674659812937, 10.11503162292146762880, 7.19159801569544317353, 1.39770070291739556523, -2.86595901981244688601, -3.76567274050094691362, -3.58051445684472378298, -4.78262917738758022539, -6.53075750894777650899, -6.31330514306857055627, -3.69971382767763534195, -0.78125094191744878298, 0.59027508113837267217, 0.53500264009607367648, 0.14860043567206217506 },
- { /* 72 kHz */ 4.13833553801985235465, 9.02461778089340082437, 12.93090366932740510782, 12.66372285767699051948, 7.76122176702274149630, 1.30617257555732278296, -2.92859120887121285358, -4.02438598495837830627, -4.16673068132491936262, -5.55618065300129916574, -7.82657788611231653103, -8.83055904466106668035, -7.34884789347713815672, -4.33977664906048314891, -1.67711310288611975398, -0.33086687044710235420 },
- { /* 80 kHz */ 4.22135293342667005517, 9.76639846582539722375, 15.46562682418357478290, 17.54378549927855248346, 13.29112084313158963396, 3.51512441998252657470, -7.51025671462502577300,-14.84164320864536219368,-16.10306907358826504148,-12.54775907691866414402, -7.40560667268782655149, -3.34708029482052565732, -1.19572214872925790860, -0.39582185216275086786, -0.14803160816846603424, -0.04292818488627011881 },
- { /* 88 kHz */ 4.18521467865996935325, 9.96765821475909556942, 16.91905760389390617551, 21.74016824668913557689, 20.96457146354060682367, 13.28640453421253890542, 0.85116933842171101587,-11.66054516261007127469,-19.62750656985581800169,-20.98831962473015904508,-16.95374072505042825458,-10.68848180295390154146, -5.17169792984369678908, -1.79975409439650319129, -0.38057073791415898674, -0.02672653932844656975 },
- { /* 96 kHz */ 4.09418877324899473189, 9.77977364010870211207, 17.10120082680385341159, 23.37356217615995036818, 25.27121942060722374276, 20.64059991613550174190, 9.99721445051475610371, -3.39833000550997938512,-15.03410054392933377278,-21.36704201000683067679,-21.40772859969388741685,-16.79355426136657673808,-10.48570200688141622163, -5.07642951516127438486, -1.75555240936989159436, -0.33817997298586054131 },
- };
-
- typedef struct {
- const char* device;
- int fd;
- long double sample_freq;
- const double* dither;
- int channels;
- int bits;
- } soundcard_t;
-
- typedef signed short sample_t;
- typedef sample_t stereo_t [2];
-
- int open_soundcard (
- soundcard_t* const k,
- const char* device,
- const int channels,
- const int bits,
- const long double freq )
- {
- int arg;
- int org;
- int index;
- int status;
-
- k->device = device;
- if ( -1 == (k->fd = open ( k->device, O_WRONLY )) ) {
- perror("opening of audio device failed");
- return -1;
- }
-
- if ( -1 == (status = ioctl (k->fd, SOUND_PCM_SYNC, 0))) {
- fprintf ( stderr, "%s: SOUND_PCM_SYNC ioctl failed: %s\n", k->device, strerror (errno));
- return -1;
- }
-
- org = arg = channels;
- if ( -1 == (status = ioctl (k->fd, SOUND_PCM_WRITE_CHANNELS, &arg)) ) {
- fprintf ( stderr, "%s: SOUND_PCM_WRITE_CHANNELS (%d) ioctl failed: %s\n" , k->device, channels, strerror (errno) );
- return -1;
- }
- if (arg != org) {
- fprintf ( stderr, "%s: unable to set number of channels: %d instead of %d\n", k->device, arg, org );
- return -1;
- }
- k->channels = arg;
-
- org = arg = bits;
- if ( -1 == (status = ioctl (k->fd, SOUND_PCM_WRITE_BITS, &arg)) ) {
- fprintf ( stderr, "%s: SOUND_PCM_WRITE_BITS ioctl failed\n", k->device );
- return -1;
- }
- if (arg != org) {
- fprintf ( stderr, "%s: unable to set sample size: %d instead of %d\n", k->device, arg, org );
- return -1;
- }
- k->bits = arg;
-
- org = arg = k->bits <= 8 ? AFMT_U8 : AFMT_S16_LE;
- if ( -1 == ioctl (k->fd, SNDCTL_DSP_SETFMT, &arg) ) {
- fprintf ( stderr, "%s: SNDCTL_DSP_SETFMT ioctl failed\n", k->device );
- return -1;
- }
- if ((arg & org) == 0) {
- fprintf ( stderr, "%s: unable to set data format\n", k->device );
- return -1;
- }
-
- org = arg = (int) floor ( freq + 0.5 );
- if ( -1 == (status = ioctl (k->fd, SOUND_PCM_WRITE_RATE, &arg)) ) {
- fprintf ( stderr, "%s: SOUND_PCM_WRITE_WRITE ioctl failed\n", k->device );
- return -1;
- }
- k->sample_freq = (long double)arg;
- index = (arg - 44000) / 8000;
- if ( index < 0 ) index = 0;
- if ( index >= sizeof(dither_coeff)/sizeof(*dither_coeff) ) index = sizeof(dither_coeff)/sizeof(*dither_coeff) - 1;
- k->dither = dither_coeff [ index ];
- return 0;
- }
-
- int play_soundcard ( soundcard_t* const k, stereo_t* samples, size_t length )
- {
- size_t bytes = length * sizeof (*samples);
-
- #ifdef COOLEDIT_FILE
- static int fd = -1;
- if ( fd < 0 ) fd = open ( COOLEDIT_FILE, O_WRONLY | O_CREAT );
- write ( fd, samples, bytes );
- #endif
-
- return write ( k->fd, samples, bytes ) == bytes ? 0 : -1;
- }
-
- int close_soundcard ( soundcard_t* const k )
- {
- return close (k->fd);
- }
-
-
- /******************************************************************************************************
- * frequency stuff
- ******************************************************************************************************/
-
- typedef enum {
- linear = 0,
- logarithm = 1,
- square = 2,
- cubic = 3,
- erb = 4,
- recip = 5
- } genmode_t;
-
- static long double linear_f ( long double x ) { return x > 0.L ? x : 0.0L; }
- static long double logarithm_f ( long double x ) { return x > 0.L ? log10 (x) : -3.5L; }
- static long double square_f ( long double x ) { return x > 0.L ? sqrt (x) : 0.0L; }
- static long double cubic_f ( long double x ) { return x > 0.L ? pow (x,1/3.) : 0.0L; }
- static long double erb_f ( long double x ) { return log (1. + 0.00437*x); }
- static long double recip_f ( long double x ) { return x > 1.L ? 1.L/x : 1.0L; }
-
- static long double inv_linear_f ( long double x ) { return x; }
- static long double inv_logarithm_f ( long double x ) { return pow (10., x); }
- static long double inv_square_f ( long double x ) { return x*x; }
- static long double inv_cubic_f ( long double x ) { return x*x*x; }
- static long double inv_erb_f ( long double x ) { return (exp(x) - 1.) * (1./0.00437); }
- static long double inv_recip_f ( long double x ) { return x > 1.L ? 1.L/x : 1.0L; }
-
- typedef long double (*converter_fn_t) ( long double );
-
- const converter_fn_t func [] = { linear_f, logarithm_f, square_f, cubic_f , erb_f , recip_f };
- const converter_fn_t inv_func [] = { inv_linear_f, inv_logarithm_f, inv_square_f, inv_cubic_f, inv_erb_f, inv_recip_f };
-
- typedef struct {
- genmode_t genmode;
- long double start_freq;
- long double stop_freq;
- long double sample_freq;
- unsigned long duration;
-
- long double phase;
- long double param1;
- long double param2;
- unsigned long counter;
- } generator_t;
-
- int open_generator (
- generator_t* const g,
- const soundcard_t* const s,
- const genmode_t genmode,
- const long double duration,
- const long double start_freq,
- const long double stop_freq )
- {
- g->sample_freq = s->sample_freq;
- g->genmode = genmode;
- g->start_freq = start_freq;
- g->stop_freq = stop_freq;
- g->duration = (unsigned long) floor ( duration * g->sample_freq + 0.5 );
-
- if ( g->duration < 2 )
- return -1;
-
- if ( g->genmode >= sizeof (func)/sizeof(*func) )
- return -1;
-
- g->param1 = func [g->genmode] ( g->start_freq / g->sample_freq );
- g->param2 = ( func [ g->genmode ] ( g->stop_freq / g->sample_freq ) - g->param1 )
- / ( g->duration - 1 );
- g->phase = 0.L;
- g->counter= 0;
-
- return 0;
- }
-
- long double iterate_generator ( generator_t* const g )
- {
- long double freq;
-
- freq = inv_func [ g->genmode ] ( g->param1 + g->counter++ * g->param2 );
-
- g->phase += freq;
- if (g->phase > 15.)
- g->phase -= 16.;
- return sin ( 2.*M_PI * g->phase );
- }
-
- long double get_sine ( generator_t* const g )
- {
- return sin ( 2.*M_PI * g->phase );
- }
-
- long double get_cosine ( generator_t* const g )
- {
- return cos ( 2.*M_PI * g->phase );
- }
-
-
- long double frequency ( const generator_t* const g )
- {
- return inv_func [ g->genmode ] ( g->param1 + g->counter * g->param2 ) * g->sample_freq;
- }
-
- int close_generator ( generator_t* const g )
- {
- return 0;
- }
-
- /******************************************************************************************************
- * amplitude stuff
- ******************************************************************************************************/
-
- typedef enum {
- up = 0,
- down = 1,
- turn_up = 2,
- turn_down = 3,
- still_up = 4,
- still_down = 5,
- change = 6
- } direction_t;
-
-
- typedef struct {
- long double sample_freq;
- direction_t direction; // down, up, still_up, still_down, turn_down, turn_up
- int multiplier; // -TURN_STEPS: down, +TURN_STEPS up
- long double amplitude;
- long double delta_amplitude;
- long direction_change;
- } amplitude_t;
-
- int open_amplifier (
- amplitude_t* const a,
- const soundcard_t* const s,
- const long double start_ampl,
- const double dB_per_sec )
- {
- a->sample_freq = s->sample_freq;
- a->direction = up;
- a->multiplier = +TURN_STEPS;
- a->amplitude = start_ampl * 32767.;
- a->delta_amplitude = dB_per_sec * 0.1151292546497022842 / s->sample_freq / TURN_STEPS;
- a->direction_change = 0;
-
- srand ( time (NULL) );
- return 0;
- }
-
- long double iterate_amplifier ( amplitude_t* const a )
- {
- switch ( a->direction ) {
- case still_up:
- assert (a->multiplier == +TURN_STEPS);
- if (a->direction_change > 0 )
- a->direction_change--;
- else
- a->direction = turn_down;
- break;
- case still_down:
- assert (a->multiplier == -TURN_STEPS);
- if (a->direction_change > 0 )
- a->direction_change--;
- else
- a->direction = turn_up;
- break;
- case turn_up:
- assert (a->direction_change == 0);
- if ( a->multiplier < +TURN_STEPS )
- a->multiplier++;
- else
- a->direction = up;
- break;
- case turn_down:
- assert (a->direction_change == 0);
- if ( a->multiplier > -TURN_STEPS )
- a->multiplier--;
- else
- a->direction = down;
- break;
- case up:
- assert (a->multiplier == +TURN_STEPS);
- assert (a->direction_change == 0);
- break;
- case down:
- assert (a->multiplier == -TURN_STEPS);
- assert (a->direction_change == 0);
- break;
- default:
- fprintf ( stderr, "\n\r*** Bug! ***\n");
- break;
- }
-
- a->amplitude *= 1.L + a->delta_amplitude * a->multiplier;
- return a->amplitude;
- }
-
- long double amplitude ( const amplitude_t* const a )
- {
- return a->amplitude / 32767.;
- }
-
- int change_direction ( amplitude_t* const a, direction_t new_direction )
- {
- switch ( new_direction ) {
- case up:
- if (a->direction == down) {
- a->direction = still_down;
- } else {
- fprintf ( stderr, "Direction not down, so ignored\n" );
- return -1;
- }
- break;
- case down:
- if (a->direction == up) {
- a->direction = still_up;
- } else {
- fprintf ( stderr, "Direction not up, so ignored\n" );
- return -1;
- }
- break;
- case change:
- switch ( a->direction ) {
- case up:
- a->direction = still_up;
- break;
- case down:
- a->direction = still_down;
- break;
- default:
- fprintf ( stderr, "Direction still changing, so ignored\n" );
- return -1;
- }
- break;
-
- default:
- fprintf ( stderr, "Direction unknown, so ignored\n" );
- return -1;
- }
-
- a->direction_change = 1 + rand () * (a->sample_freq * DELAY_UNTIL_XCHG / RAND_MAX);
- return 0;
- }
-
- int close_amplifier ( amplitude_t* const a )
- {
- return 0;
- }
-
-
- double ATH ( double freq )
- {
- static float tab [] = {
- /* 10.0 */ 96.69, 96.69, 96.26, 95.12,
- /* 12.6 */ 93.53, 91.13, 88.82, 86.76,
- /* 15.8 */ 84.69, 82.43, 79.97, 77.48,
- /* 20.0 */ 74.92, 72.39, 70.00, 67.62,
- /* 25.1 */ 65.29, 63.02, 60.84, 59.00,
- /* 31.6 */ 57.17, 55.34, 53.51, 51.67,
- /* 39.8 */ 50.04, 48.12, 46.38, 44.66,
- /* 50.1 */ 43.10, 41.73, 40.50, 39.22,
- /* 63.1 */ 37.23, 35.77, 34.51, 32.81,
- /* 79.4 */ 31.32, 30.36, 29.02, 27.60,
- /* 100.0 */ 26.58, 25.91, 24.41, 23.01,
- /* 125.9 */ 22.12, 21.25, 20.18, 19.00,
- /* 158.5 */ 17.70, 16.82, 15.94, 15.12,
- /* 199.5 */ 14.30, 13.41, 12.60, 11.98,
- /* 251.2 */ 11.36, 10.57, 9.98, 9.43,
- /* 316.2 */ 8.87, 8.46, 7.44, 7.12,
- /* 398.1 */ 6.93, 6.68, 6.37, 6.06,
- /* 501.2 */ 5.80, 5.55, 5.29, 5.02,
- /* 631.0 */ 4.75, 4.48, 4.22, 3.98,
- /* 794.3 */ 3.75, 3.51, 3.27, 3.22,
- /* 1000.0 */ 3.12, 3.01, 2.91, 2.68,
- /* 1258.9 */ 2.46, 2.15, 1.82, 1.46,
- /* 1584.9 */ 1.07, 0.61, 0.13, -0.35,
- /* 1995.3 */ -0.96, -1.56, -1.79, -2.35,
- /* 2511.9 */ -2.95, -3.50, -4.01, -4.21,
- /* 3162.3 */ -4.46, -4.99, -5.32, -5.35,
- /* 3981.1 */ -5.13, -4.76, -4.31, -3.13,
- /* 5011.9 */ -1.79, 0.08, 2.03, 4.03,
- /* 6309.6 */ 5.80, 7.36, 8.81, 10.22,
- /* 7943.3 */ 11.54, 12.51, 13.48, 14.21,
- /* 10000.0 */ 14.79, 13.99, 12.85, 11.93,
- /* 12589.3 */ 12.87, 15.19, 19.14, 23.69,
- /* 15848.9 */ 33.52, 48.65, 59.42, 61.77,
- /* 19952.6 */ 63.85, 66.04, 68.33, 70.09,
- /* 25118.9 */ 70.66, 71.27, 71.91, 72.60,
- };
- double freq_log;
- double dB;
- unsigned index;
-
- if ( freq < 10. ) freq = 10.;
- if ( freq > 25000. ) freq = 25000.;
-
- freq_log = 40. * log10 (0.1 * freq); /* 4 steps per third, starting at 10 Hz */
- index = (unsigned) freq_log;
- assert ( index < sizeof(tab)/sizeof(*tab) );
- dB = tab [index] * (1 + index - freq_log) + tab [index+1] * (freq_log - index);
- return pow ( 10., 0.05*dB );
- }
-
- /******************************************************************************************************
- * keyboard stuff
- ******************************************************************************************************/
-
- typedef struct {
- int init;
- struct termios stored_setting;
- struct termios current_setting;
- } keyboard_t;
-
- static keyboard_t* __k;
-
- /* Restore term-settings to those saved when term_init was called */
-
- static void term_restore (void)
- {
- tcsetattr ( 0, TCSANOW, &(__k->stored_setting) );
- } /* term_restore */
-
- /* Clean up terminal; called on exit */
-
- static void term_exit ( int sig )
- {
- term_restore ();
- } /* term_exit */
-
- /* Will be called when ctrl-Z is pressed, this correctly handles the terminal */
-
- static void term_ctrl_z ( int sig )
- {
- signal ( SIGTSTP, term_ctrl_z );
- term_restore ();
- kill ( getpid(), SIGSTOP );
- } /* term_ctrl_z */
-
- /* Will be called when application is continued after having been stopped */
-
- static void term_cont ( int sig )
- {
- signal ( SIGCONT, term_cont );
- tcsetattr ( 0, TCSANOW, &(__k->current_setting) );
- } /* term_cont() */
-
- int open_keyboard ( keyboard_t* const k )
- {
- __k = k;
- tcgetattr ( 0, &(k->stored_setting) );
- tcgetattr ( 0, &(k->current_setting) );
-
- signal ( SIGINT, term_exit ); /* We _must_ clean up when we exit */
- signal ( SIGQUIT, term_exit );
- signal ( SIGTSTP, term_ctrl_z ); /* Ctrl-Z must also be handled */
- signal ( SIGCONT, term_cont );
- // atexit ( term_exit );
-
- /* One or more characters are sufficient to cause a read to return */
- cfmakeraw ( &(k->current_setting) );
- k->current_setting.c_oflag |= ONLCR | OPOST; /* enables NL => CRLF on output */
-
- tcsetattr ( 0, TCSANOW, &(k->current_setting) );
- return 0;
- }
-
- int getchar_keyboard ( keyboard_t* const k )
- {
- struct timeval t;
- fd_set fd [1];
- int ret;
- unsigned char c;
-
- FD_SET (0, fd);
- t.tv_sec = 0;
- t.tv_usec = 0;
-
- ret = select ( 1, fd, NULL, NULL, &t );
-
- switch ( ret ) {
- case 0:
- return -1;
- case 1:
- ret = read (0, &c, 1);
- return ret == 1 ? c : -1;
- default:
- return -2;
- }
- }
-
- int close_keyboard ( keyboard_t* const k )
- {
- term_restore ();
- return 0;
- }
-
-
- /******************************************************************************************************
- * reporting stuff
- ******************************************************************************************************/
-
- int report_open ( void )
- {
- static char buff [32767];
- fflush ( stdout );
- setvbuf ( stdout, buff, _IOFBF, sizeof(buff) );
- return 0;
- }
-
- int report ( const generator_t* const g, const amplitude_t* const a )
- {
- static double last_freq = -1.;
- static double last_level = -1.;
- double freq;
- double level;
-
- freq = frequency (g);
- level = 20. * log10 (amplitude (a) * ATH (freq) ) + 80.;
-
- if ( last_freq >= 0 )
- printf ( "%11.3f %8.2f\n", sqrt (freq*last_freq), 0.5 * (level+last_level) );
- printf ( "# %9.3f %8.2f\n", freq, level );
-
- fflush ( stdout );
-
- last_freq = freq;
- last_level = level;
- return 0;
- }
-
- int report_close ( void )
- {
- printf ( "%%%%\n\n" );
- fflush ( stdout );
- close ( dup ( fileno(stdout) ) );
- setvbuf ( stdout, NULL, _IONBF, 0 );
- return 0;
- }
-
-
- /******************************************************************************************************
- * main stuff
- ******************************************************************************************************/
-
- typedef enum {
- left = 0,
- right = 1,
- phase0 = 2,
- both = 2,
- phase90 = 3,
- phase180 = 4,
- phasemod = 5
- } earmode_t;
-
- static long double scalar ( const double* a, const double* b )
- {
- return a[ 0]*b[ 0] + a[ 1]*b[ 1] + a[ 2]*b[ 2] + a[ 3]*b[ 3]
- +a[ 4]*b[ 4] + a[ 5]*b[ 5] + a[ 6]*b[ 6] + a[ 7]*b[ 7]
- +a[ 8]*b[ 8] + a[ 9]*b[ 9] + a[10]*b[10] + a[11]*b[11]
- +a[12]*b[12] + a[13]*b[13] + a[14]*b[14] + a[15]*b[15];
- }
-
- int experiment ( generator_t* const g,
- amplitude_t* const a,
- keyboard_t* const k,
- soundcard_t* const s,
- earmode_t earmode )
- {
- long i;
- int j;
- stereo_t samples [512];
- static double quant_errors [2] [16];
- long double val;
- double ampl;
- long ival;
-
- fprintf ( stderr, "\r+++ up +++" );
- for ( i = 0; i < g->duration; i += sizeof(samples)/sizeof(*samples) ) {
- fprintf ( stderr, "%3lu%%\b\b\b\b", i*100lu/g->duration );
-
- for (j = 0; j < sizeof(samples)/sizeof(*samples); j++ ) {
- ampl = iterate_amplifier (a) * ATH (frequency (g));
- val = ampl * iterate_generator (g);
- ival = (long) floor ( val + 0.5 + scalar (quant_errors[0], s->dither) );
-
- if ( ival != (sample_t) ival ) {
- report (g, a);
- fprintf ( stderr, "\rOverrun \n\n" );
- return -1;
- }
- memmove ( & quant_errors [0] [1], & quant_errors [0] [0],
- sizeof(quant_errors[0]) - sizeof(quant_errors[0][0]) );
- quant_errors [0] [0] = val - ival;
- switch ( earmode ) {
- case both:
- samples [j] [0] = samples [j] [1] = ival;
- break;
- case left:
- samples [j] [0] = ival;
- samples [j] [1] = 0;
- break;
- case right:
- samples [j] [0] = 0;
- samples [j] [1] = ival;
- break;
- case phase180:
- samples [j] [0] = ival == -32768 ? 32767 : -ival;
- samples [j] [1] = +ival;
- break;
- case phase90:
- samples [j] [0] = ival;
- val = ampl * get_cosine (g);
- ival = (long) floor ( val + 0.5 + scalar (quant_errors[1], s->dither) );
- if ( ival != (sample_t) ival ) {
- report (g, a);
- fprintf ( stderr, "\rOverrun \n\n" );
- return -1;
- }
- memmove ( & quant_errors [1] [1], & quant_errors [1] [0],
- sizeof(quant_errors[1]) - sizeof(quant_errors[1][0]) );
- quant_errors [1] [0] = val - ival;
- samples [j] [1] = ival;
- break;
- default:
- assert (0);
- return -1;
- }
- }
- play_soundcard ( s, samples, sizeof(samples)/sizeof(*samples) );
- if ( amplitude (a) * ATH (frequency (g)) <= 3.16227766e-6 ) {
- report (g, a);
- fprintf ( stderr, "\rUnderrun \n\n" );
- return -1;
- }
-
- switch ( getchar_keyboard (k) ) {
- case '+':
- fprintf ( stderr, "\r+++ up +++" );
- report (g, a);
- change_direction ( a, up );
- break;
- case '-':
- fprintf ( stderr, "\r--- down ---" );
- report (g, a);
- change_direction ( a, down );
- break;
- case '\r':
- case '\n':
- fprintf ( stderr, "\r** change **" );
- report (g, a);
- change_direction ( a, change );
- break;
- case 'C'&0x1F:
- case 'q':
- case 'Q':
- case 'x':
- case 'X':
- fprintf ( stderr, "\rBreak \n\n" );
- fflush ( stderr );
- return -1;
- default:
- fprintf ( stderr, "\a" );
- break;
- case -1:
- break;
- }
- }
-
- fprintf ( stderr, "\rReady \n\n" );
- return 0;
- }
-
- static void usage ( void )
- {
- static const char help[] =
- "'Absolute Threshold of Hearing' -- Version 0.07 (C) Frank Klemm 2000\n"
- "\n"
- "usage:\n"
- " ath type minfreq maxfreq duration ampl_speed [start_level [earmode] > reportfile\n"
- "\n"
- " type: linear, logarithm, square, cubic, erb, recip\n"
- " minfreq: initial frequency [Hz]\n"
- " maxfreq: end frequency [Hz]\n"
- " duration: duration of the experiment [s]\n"
- " ampl_speed: amplitude slope speed [phon/s]\n"
- " start_level: absolute level at startup [0...1]\n"
- " earmode: left, right, both, phase90, phase180\n"
- "\n"
- "example:\n"
- " ath erb 700 22000 600 3 0.0001 > result1\n"
- " ath erb 1400 16 360 3 0.0001 > result2\n"
- "\n"
- "handling:\n"
- " press '-' once when you start hearing a tone\n"
- " press '+' once when you stop hearing a tone\n"
- " press 'q' to early leave the program\n"
- " on errors the pressed key is ignored\n";
-
- fprintf ( stderr, "%s\n", help );
- }
-
- int main ( int argc, char** argv )
- {
- generator_t g;
- amplitude_t a;
- soundcard_t s;
- keyboard_t k;
- genmode_t genmode;
- earmode_t earmode;
-
- if ( argc == 1 ) {
- usage ();
- system ( "./ath erb 700 22000 600 3 0.0001 > result1" );
- system ( "./ath erb 1400 16 360 3 0.0001 > result2" );
- system ( "xmgr result1 result2 &> /dev/null &" );
- return 0;
- }
-
- if ( argc < 6 ) {
- usage ();
- return 1;
- }
-
- if ( 0 == strncmp ( argv[1], "li" , 2) ) genmode = linear;
- else if ( 0 == strncmp ( argv[1], "lo" , 2) ) genmode = logarithm;
- else if ( 0 == strncmp ( argv[1], "sq" , 2) ) genmode = square;
- else if ( 0 == strncmp ( argv[1], "cu" , 2) ) genmode = cubic;
- else if ( 0 == strncmp ( argv[1], "er" , 2) ) genmode = erb;
- else if ( 0 == strncmp ( argv[1], "re" , 2) ) genmode = recip;
- else {
- usage ();
- return 1;
- }
-
- if ( argc < 8 ) earmode = both;
- else if ( 0 == strncmp ( argv[7], "le" , 2) ) earmode = left;
- else if ( 0 == strncmp ( argv[7], "ri" , 2) ) earmode = right;
- else if ( 0 == strncmp ( argv[7], "bo" , 2) ) earmode = both;
- else if ( 0 == strncmp ( argv[7], "phase9" , 6) ) earmode = phase90;
- else if ( 0 == strncmp ( argv[7], "phase1" , 6) ) earmode = phase180;
- else {
- usage ();
- return 1;
- }
-
-
- open_soundcard ( &s, AUDIO_DEVICE, sizeof(stereo_t)/sizeof(sample_t), CHAR_BIT*sizeof(sample_t), 96000.0 );
- open_generator ( &g, &s, genmode, atof (argv[4]), atof (argv[2]), atof (argv[3]) );
- open_amplifier ( &a, &s, argc > 6 ? atof (argv[6]) : 0.0001, atof (argv[5]) );
- open_keyboard ( &k );
-
- report_open ( );
- experiment ( &g, &a, &k, &s, earmode );
- report_close ( );
-
- close_keyboard ( &k );
- close_amplifier( &a );
- close_generator( &g );
- close_soundcard( &s );
-
- return 0;
- }
-
- /* end of ath.c */
-
-
-