HomoFast-eSpeak-Persian/src/libespeak-ng/setlengths.c

/*
 * Copyright (C) 2005 to 2011 by Jonathan Duddington
 * email: [email protected]
 * Copyright (C) 2015-2016 Reece H. Dunn
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see: <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

#include <espeak-ng/espeak_ng.h>
#include <espeak-ng/speak_lib.h>
#include <espeak-ng/encoding.h>

#include "speech.h"
#include "phoneme.h"
#include "synthesize.h"
#include "voice.h"
#include "translate.h"

extern int GetAmplitude(void);
extern void DoSonicSpeed(int value);
extern int saved_parameters[];

// convert from words-per-minute to internal speed factor
// Use this to calibrate speed for wpm 80-350
static unsigned char speed_lookup[] = {
	255, 255, 255, 255, 255, //  80
	253, 249, 245, 242, 238, //  85
	235, 232, 228, 225, 222, //  90
	218, 216, 213, 210, 207, //  95
	204, 201, 198, 196, 193, // 100
	191, 188, 186, 183, 181, // 105
	179, 176, 174, 172, 169, // 110
	168, 165, 163, 161, 159, // 115
	158, 155, 153, 152, 150, // 120
	148, 146, 145, 143, 141, // 125
	139, 137, 136, 135, 133, // 130
	131, 130, 129, 127, 126, // 135
	124, 123, 122, 120, 119, // 140
	118, 117, 115, 114, 113, // 145
	112, 111, 110, 109, 107, // 150
	106, 105, 104, 103, 102, // 155
	101, 100,  99,  98,  97, // 160
	 96,  95,  94,  93,  92, // 165
	 91,  90,  89,  89,  88, // 170
	 87,  86,  85,  84,  83, // 175
	 82,  82,  81,  80,  80, // 180
	 79,  78,  77,  76,  76, // 185
	 75,  75,  74,  73,  72, // 190
	 71,  71,  70,  69,  69, // 195
	 68,  67,  67,  66,  66, // 200
	 65,  64,  64,  63,  62, // 205
	 62,  61,  61,  60,  59, // 210
	 59,  58,  58,  57,  57, // 215
	 56,  56,  55,  54,  54, // 220
	 53,  53,  52,  52,  52, // 225
	 51,  50,  50,  49,  49, // 230
	 48,  48,  47,  47,  46, // 235
	 46,  46,  45,  45,  44, // 240
	 44,  44,  43,  43,  42, // 245
	 41,  40,  40,  40,  39, // 250
	 39,  39,  38,  38,  38, // 255
	 37,  37,  37,  36,  36, // 260
	 35,  35,  35,  35,  34, // 265
	 34,  34,  33,  33,  33, // 270
	 32,  32,  31,  31,  31, // 275
	 30,  30,  30,  29,  29, // 280
	 29,  29,  28,  28,  27, // 285
	 27,  27,  27,  26,  26, // 290
	 26,  26,  25,  25,  25, // 295
	 24,  24,  24,  24,  23, // 300
	 23,  23,  23,  22,  22, // 305
	 22,  21,  21,  21,  21, // 310
	 20,  20,  20,  20,  19, // 315
	 19,  19,  18,  18,  17, // 320
	 17,  17,  16,  16,  16, // 325
	 16,  16,  16,  15,  15, // 330
	 15,  15,  14,  14,  14, // 335
	 13,  13,  13,  12,  12, // 340
	 12,  12,  11,  11,  11, // 345
	 11,  10,  10,  10,   9, // 350
	  9,   9,   8,   8,   8, // 355
};

// speed_factor1 adjustments for speeds 350 to 374: pauses
static unsigned char pause_factor_350[] = {
	22, 22, 22, 22, 22, 22, 22, 21, 21, 21, // 350
	21, 20, 20, 19, 19, 18, 17, 16, 15, 15, // 360
	15, 15, 15, 15, 15                      // 370
};

// wav_factor adjustments for speeds 350 to 450
// Use this to calibrate speed for wpm 350-450
static unsigned char wav_factor_350[] = {
	120, 121, 120, 119, 119, // 350
	118, 118, 117, 116, 116, // 355
	115, 114, 113, 112, 112, // 360
	111, 111, 110, 109, 108, // 365
	107, 106, 106, 104, 103, // 370
	103, 102, 102, 102, 101, // 375
	101,  99,  98,  98,  97, // 380
	 96,  96,  95,  94,  93, // 385
	 91,  90,  91,  90,  89, // 390
	 88,  86,  85,  86,  85, // 395
	 85,  84,  82,  81,  80, // 400
	 79,  77,  78,  78,  76, // 405
	 77,  75,  75,  74,  73, // 410
	 71,  72,  70,  69,  69, // 415
	 69,  67,  65,  64,  63, // 420
	 63,  63,  61,  61,  59, // 425
	 59,  59,  58,  56,  57, // 430
	 58,  56,  54,  53,  52, // 435
	 52,  53,  52,  52,  50, // 440
	 48,  47,  47,  45,  46, // 445
	 45                      // 450
};

static int speed1 = 130;
static int speed2 = 121;
static int speed3 = 118;

#if HAVE_SONIC_H

void SetSpeed(int control)
{
	int x;
	int s1;
	int wpm;
	int wpm2;
	int wpm_value;
	double sonic;

	speed.loud_consonants = 0;
	speed.min_sample_len = 450;
	speed.lenmod_factor = 110; // controls the effect of FRFLAG_LEN_MOD reduce length change
	speed.lenmod2_factor = 100;
	speed.min_pause = 5;

	wpm = embedded_value[EMBED_S];
	if (control == 2)
		wpm = embedded_value[EMBED_S2];

	wpm_value = wpm;

	if (voice->speed_percent > 0)
		wpm = (wpm * voice->speed_percent)/100;

	if (control & 2)
		DoSonicSpeed(1 * 1024);
	if ((wpm_value >= 450) || ((wpm_value > speed.fast_settings[0]) && (wpm > 350))) {
		wpm2 = wpm;
		wpm = 175;

		// set special eSpeak speed parameters for Sonic use
		// The eSpeak output will be speeded up by at least x2
		x = 73;
		if (control & 1) {
			speed1 = (x * voice->speedf1)/256;
			speed2 = (x * voice->speedf2)/256;
			speed3 = (x * voice->speedf3)/256;
		}
		if (control & 2) {
			sonic = ((double)wpm2)/wpm;
			DoSonicSpeed((int)(sonic * 1024));
			speed.pause_factor = 85;
			speed.clause_pause_factor = 80;
			speed.min_pause = 22;
			speed.min_sample_len = 450*2;
			speed.wav_factor = 211;
			speed.lenmod_factor = 210;
			speed.lenmod2_factor = 170;
		}
		return;
	}

	if (wpm > 450)
		wpm = 450;

	if (wpm > 360)
		speed.loud_consonants = (wpm - 360) / 8;

	wpm2 = wpm;
	if (wpm > 359) wpm2 = 359;
	if (wpm < 80) wpm2 = 80;
	x = speed_lookup[wpm2-80];

	if (wpm >= 380)
		x = 7;
	if (wpm >= 400)
		x = 6;

	if (control & 1) {
		// set speed factors for different syllable positions within a word
		// these are used in CalcLengths()
		speed1 = (x * voice->speedf1)/256;
		speed2 = (x * voice->speedf2)/256;
		speed3 = (x * voice->speedf3)/256;

		if (x <= 7) {
			speed1 = x;
			speed2 = speed3 = x - 1;
		}
	}

	if (control & 2) {
		// these are used in synthesis file

		if (wpm > 350) {
			speed.lenmod_factor = 85 - (wpm - 350) / 3;
			speed.lenmod2_factor = 60 - (wpm - 350) / 8;
		} else if (wpm > 250) {
			speed.lenmod_factor = 110 - (wpm - 250)/4;
			speed.lenmod2_factor = 110 - (wpm - 250)/2;
		}

		s1 = (x * voice->speedf1)/256;

		if (wpm >= 170)
			speed.wav_factor = 110 + (150*s1)/128; // reduced speed adjustment, used for playing recorded sounds
		else
			speed.wav_factor = 128 + (128*s1)/130; // = 215 at 170 wpm

		if (wpm >= 350)
			speed.wav_factor = wav_factor_350[wpm-350];

		if (wpm >= 390) {
			speed.min_sample_len = 450 - (wpm - 400)/2;
			if (wpm > 440)
				speed.min_sample_len = 420 - (wpm - 440);
		}

		// adjust for different sample rates
		speed.min_sample_len = (speed.min_sample_len * samplerate_native) / 22050;

		speed.pause_factor = (256 * s1)/115; // full speed adjustment, used for pause length
		speed.clause_pause_factor = 0;

		if (wpm > 430)
			speed.pause_factor = 12;
		else if (wpm > 400)
			speed.pause_factor = 13;
		else if (wpm > 374)
			speed.pause_factor = 14;
		else if (wpm > 350)
			speed.pause_factor = pause_factor_350[wpm - 350];

		if (speed.clause_pause_factor == 0) {
			// restrict the reduction of pauses between clauses
			if ((speed.clause_pause_factor = speed.pause_factor) < 16)
				speed.clause_pause_factor = 16;
		}
	}
}

#else

void SetSpeed(int control)
{
	// This is the earlier version of SetSpeed() before sonic speed-up was added
	int x;
	int s1;
	int wpm;
	int wpm2;

	speed.loud_consonants = 0;
	speed.min_sample_len = 450;
	speed.lenmod_factor = 110; // controls the effect of FRFLAG_LEN_MOD reduce length change
	speed.lenmod2_factor = 100;

	wpm = embedded_value[EMBED_S];
	if (control == 2)
		wpm = embedded_value[EMBED_S2];

	if (voice->speed_percent > 0)
		wpm = (wpm * voice->speed_percent)/100;
	if (wpm > 450)
		wpm = 450;

	if (wpm > 360)
		speed.loud_consonants = (wpm - 360) / 8;

	wpm2 = wpm;
	if (wpm > 359) wpm2 = 359;
	if (wpm < 80) wpm2 = 80;
	x = speed_lookup[wpm2-80];

	if (wpm >= 380)
		x = 7;
	if (wpm >= 400)
		x = 6;

	if (control & 1) {
		// set speed factors for different syllable positions within a word
		// these are used in CalcLengths()
		speed1 = (x * voice->speedf1)/256;
		speed2 = (x * voice->speedf2)/256;
		speed3 = (x * voice->speedf3)/256;

		if (x <= 7) {
			speed1 = x;
			speed2 = speed3 = x - 1;
		}
	}

	if (control & 2) {
		// these are used in synthesis file

		if (wpm > 350) {
			speed.lenmod_factor = 85 - (wpm - 350) / 3;
			speed.lenmod2_factor = 60 - (wpm - 350) / 8;
		} else if (wpm > 250) {
			speed.lenmod_factor = 110 - (wpm - 250)/4;
			speed.lenmod2_factor = 110 - (wpm - 250)/2;
		}

		s1 = (x * voice->speedf1)/256;

		if (wpm >= 170)
			speed.wav_factor = 110 + (150*s1)/128; // reduced speed adjustment, used for playing recorded sounds
		else
			speed.wav_factor = 128 + (128*s1)/130; // = 215 at 170 wpm

		if (wpm >= 350)
			speed.wav_factor = wav_factor_350[wpm-350];

		if (wpm >= 390) {
			speed.min_sample_len = 450 - (wpm - 400)/2;
			if (wpm > 440)
				speed.min_sample_len = 420 - (wpm - 440);
		}

		speed.pause_factor = (256 * s1)/115; // full speed adjustment, used for pause length
		speed.clause_pause_factor = 0;

		if (wpm > 430)
			speed.pause_factor = 12;
		else if (wpm > 400)
			speed.pause_factor = 13;
		else if (wpm > 374)
			speed.pause_factor = 14;
		else if (wpm > 350)
			speed.pause_factor = pause_factor_350[wpm - 350];

		if (speed.clause_pause_factor == 0) {
			// restrict the reduction of pauses between clauses
			if ((speed.clause_pause_factor = speed.pause_factor) < 16)
				speed.clause_pause_factor = 16;
		}
	}
}

#endif

espeak_ng_STATUS SetParameter(int parameter, int value, int relative)
{
	// parameter: reset-all, amp, pitch, speed, linelength, expression, capitals, number grouping
	// relative 0=absolute  1=relative

	int new_value = value;
	int default_value;

	if (relative) {
		if (parameter < 5) {
			default_value = param_defaults[parameter];
			new_value = default_value + (default_value * value)/100;
		}
	}
	param_stack[0].parameter[parameter] = new_value;
	saved_parameters[parameter] = new_value;

	switch (parameter)
	{
	case espeakRATE:
		embedded_value[EMBED_S] = new_value;
		embedded_value[EMBED_S2] = new_value;
		SetSpeed(3);
		break;
	case espeakVOLUME:
		embedded_value[EMBED_A] = new_value;
		GetAmplitude();
		break;
	case espeakPITCH:
		if (new_value > 99) new_value = 99;
		if (new_value < 0) new_value = 0;
		embedded_value[EMBED_P] = new_value;
		break;
	case espeakRANGE:
		if (new_value > 99) new_value = 99;
		embedded_value[EMBED_R] = new_value;
		break;
	case espeakLINELENGTH:
		option_linelength = new_value;
		break;
	case espeakWORDGAP:
		option_wordgap = new_value;
		break;
	case espeakINTONATION:
		if ((new_value & 0xff) != 0)
			translator->langopts.intonation_group = new_value & 0xff;
		option_tone_flags = new_value;
		break;
	default:
		return EINVAL;
	}
	return ENS_OK;
}

static void DoEmbedded2(int *embix)
{
	// There were embedded commands in the text at this point

	unsigned int word;

	do {
		word = embedded_list[(*embix)++];

		if ((word & 0x1f) == EMBED_S) {
			// speed
			SetEmbedded(word & 0x7f, word >> 8); // adjusts embedded_value[EMBED_S]
			SetSpeed(1);
		}
	} while ((word & 0x80) == 0);
}

void CalcLengths(Translator *tr)
{
	int ix;
	int ix2;
	PHONEME_LIST *prev;
	PHONEME_LIST *next;
	PHONEME_LIST *next2;
	PHONEME_LIST *next3;
	PHONEME_LIST *p;
	PHONEME_LIST *p2;

	int stress;
	int type;
	static int more_syllables = 0;
	int pre_sonorant = 0;
	int pre_voiced = 0;
	int last_pitch = 0;
	int pitch_start;
	int length_mod;
	int next2type;
	int len;
	int env2;
	int end_of_clause;
	int embedded_ix = 0;
	int min_drop;
	int pitch1;
	int emphasized;
	int tone_mod;
	unsigned char *pitch_env = NULL;
	PHONEME_DATA phdata_tone;

	for (ix = 1; ix < n_phoneme_list; ix++) {
		prev = &phoneme_list[ix-1];
		p = &phoneme_list[ix];
		stress = p->stresslevel & 0x7;
		emphasized = p->stresslevel & 0x8;

		next = &phoneme_list[ix+1];

		if (p->synthflags & SFLAG_EMBEDDED)
			DoEmbedded2(&embedded_ix);

		type = p->type;
		if (p->synthflags & SFLAG_SYLLABLE)
			type = phVOWEL;

		switch (type)
		{
		case phPAUSE:
			last_pitch = 0;
			break;
		case phSTOP:
			last_pitch = 0;
			if (prev->type == phFRICATIVE)
				p->prepause = 25;
			else if ((more_syllables > 0) || (stress < 4))
				p->prepause = 48;
			else
				p->prepause = 60;

			if (prev->type == phSTOP)
				p->prepause = 60;

			if ((tr->langopts.word_gap & 0x10) && (p->newword))
				p->prepause = 60;

			if (p->ph->phflags & phLENGTHENSTOP)
				p->prepause += 30;

			if (p->synthflags & SFLAG_LENGTHEN)
				p->prepause += tr->langopts.long_stop;
			break;
		case phVFRICATIVE:
		case phFRICATIVE:
			if (p->newword) {
				if ((prev->type == phVOWEL) && (p->ph->phflags & phNOPAUSE)) {
				} else
					p->prepause = 15;
			}

			if (next->type == phPAUSE && prev->type == phNASAL && !(p->ph->phflags&phVOICELESS))
				p->prepause = 25;

			if (prev->ph->phflags & phBRKAFTER)
				p->prepause = 30;

			if ((tr->langopts.word_gap & 0x10) && (p->newword))
				p->prepause = 30;

			if ((p->ph->phflags & phSIBILANT) && next->type == phSTOP && !next->newword) {
				if (prev->type == phVOWEL)
					p->length = 200; // ?? should do this if it's from a prefix
				else
					p->length = 150;
			} else
				p->length = 256;

			if (type == phVFRICATIVE) {
				if (next->type == phVOWEL)
					pre_voiced = 1;
				if ((prev->type == phVOWEL) || (prev->type == phLIQUID))
					p->length = (255 + prev->length)/2;
			}
			break;
		case phVSTOP:
			if (prev->type == phVFRICATIVE || prev->type == phFRICATIVE || (prev->ph->phflags & phSIBILANT) || (prev->type == phLIQUID))
				p->prepause = 30;

			if (next->type == phVOWEL || next->type == phLIQUID) {
				if ((next->type == phVOWEL) || !next->newword)
					pre_voiced = 1;

				p->prepause = 40;

				if (prev->type == phVOWEL) {
					p->prepause = 0; // use murmur instead to link from the preceding vowel
				} else if (prev->type == phPAUSE) {
					// reduce by the length of the preceding pause
					if (prev->length < p->prepause)
						p->prepause -= prev->length;
					else
						p->prepause = 0;
				} else if (p->newword == 0) {
					if (prev->type == phLIQUID)
						p->prepause = 20;
					if (prev->type == phNASAL)
						p->prepause = 12;

					if (prev->type == phSTOP && !(prev->ph->phflags & phVOICELESS))
						p->prepause = 0;
				}
			}
			if ((tr->langopts.word_gap & 0x10) && (p->newword) && (p->prepause < 20))
				p->prepause = 20;
			break;
		case phLIQUID:
		case phNASAL:
			p->amp = tr->stress_amps[0]; // unless changed later
			p->length = 256; //  TEMPORARY

			if (p->newword) {
				if (prev->type == phLIQUID)
					p->prepause = 25;
				if (prev->type == phVOWEL) {
					if (!(p->ph->phflags & phNOPAUSE))
						p->prepause = 12;
				}
			}

			if (next->type == phVOWEL)
				pre_sonorant = 1;
			else {
				p->pitch2 = last_pitch;

				if ((prev->type == phVOWEL) || (prev->type == phLIQUID)) {
					p->length = prev->length;

					if (p->type == phLIQUID)
						p->length = speed1;

					if (next->type == phVSTOP)
						p->length = (p->length * 160)/100;
					if (next->type == phVFRICATIVE)
						p->length = (p->length * 120)/100;
				} else {
					for (ix2 = ix; ix2 < n_phoneme_list; ix2++) {
						if (phoneme_list[ix2].type == phVOWEL) {
							p->pitch2 = phoneme_list[ix2].pitch2;
							break;
						}
					}
				}

				p->pitch1 = p->pitch2-16;
				if (p->pitch2 < 16)
					p->pitch1 = 0;
				p->env = PITCHfall;
				pre_voiced = 0;
			}
			break;
		case phVOWEL:
			min_drop = 0;
			next2 = &phoneme_list[ix+2];
			next3 = &phoneme_list[ix+3];

			if (stress > 7) stress = 7;

			if (stress <= 1)
				stress = stress ^ 1; // swap diminished and unstressed (until we swap stress_amps,stress_lengths in tr_languages)
			if (pre_sonorant)
				p->amp = tr->stress_amps[stress]-1;
			else
				p->amp = tr->stress_amps[stress];

			if (emphasized)
				p->amp = 25;

			if (ix >= (n_phoneme_list-3)) {
				// last phoneme of a clause, limit its amplitude
				if (p->amp > tr->langopts.param[LOPT_MAXAMP_EOC])
					p->amp = tr->langopts.param[LOPT_MAXAMP_EOC];
			}

			// is the last syllable of a word ?
			more_syllables = 0;
			end_of_clause = 0;
			for (p2 = p+1; p2->newword == 0; p2++) {
				if ((p2->type == phVOWEL) && !(p2->ph->phflags & phNONSYLLABIC))
					more_syllables++;

				if (p2->ph->code == phonPAUSE_CLAUSE)
					end_of_clause = 2;
			}
			if (p2->ph->code == phonPAUSE_CLAUSE)
				end_of_clause = 2;

			if ((p2->newword & 2) && (more_syllables == 0))
				end_of_clause = 2;

			// calc length modifier
			if ((next->ph->code == phonPAUSE_VSHORT) && (next2->type == phPAUSE)) {
				// if PAUSE_VSHORT is followed by a pause, then use that
				next = next2;
				next2 = next3;
				next3 = &phoneme_list[ix+4];
			}

			next2type = next2->ph->length_mod;
			if (more_syllables == 0) {
				if (next->newword || next2->newword) {
					// don't use 2nd phoneme over a word boundary, unless it's a pause
					if (next2type != 1)
						next2type = 0;
				}

				len = tr->langopts.length_mods0[next2type *10+ next->ph->length_mod];

				if ((next->newword) && (tr->langopts.word_gap & 0x20)) {
					// consider as a pause + first phoneme of the next word
					length_mod = (len + tr->langopts.length_mods0[next->ph->length_mod *10+ 1])/2;
				} else
					length_mod = len;
			} else {
				length_mod = tr->langopts.length_mods[next2type *10+ next->ph->length_mod];

				if ((next->type == phNASAL) && (next2->type == phSTOP || next2->type == phVSTOP) && (next3->ph->phflags & phVOICELESS))
					length_mod -= 15;
			}

			if (more_syllables == 0)
				length_mod *= speed1;
			else if (more_syllables == 1)
				length_mod *= speed2;
			else
				length_mod *= speed3;

			length_mod = length_mod / 128;

			if (length_mod < 8)
				length_mod = 8; // restrict how much lengths can be reduced

			if (stress >= 7) {
				// tonic syllable, include a constant component so it doesn't decrease directly with speed
				length_mod += tr->langopts.lengthen_tonic;
				if (emphasized)
					length_mod += (tr->langopts.lengthen_tonic/2);
			} else if (emphasized)
				length_mod += tr->langopts.lengthen_tonic;

			if ((len = tr->stress_lengths[stress]) == 0)
				len = tr->stress_lengths[6];

			length_mod = length_mod * len;

			if (p->tone_ph != 0) {
				if ((tone_mod = phoneme_tab[p->tone_ph]->std_length) > 0) {
					// a tone phoneme specifies a percentage change to the length
					length_mod = (length_mod * tone_mod) / 100;
				}
			}

			if ((end_of_clause == 2) && !(tr->langopts.stress_flags & S_NO_EOC_LENGTHEN)) {
				// this is the last syllable in the clause, lengthen it - more for short vowels
				len = (p->ph->std_length * 2);
				if (tr->langopts.stress_flags & S_EO_CLAUSE1)
					len = 200; // don't lengthen short vowels more than long vowels at end-of-clause
				length_mod = length_mod * (256 + (280 - len)/3)/256;
			}

			if (length_mod > tr->langopts.max_lengthmod*speed1) {
				// limit the vowel length adjustment for some languages
				length_mod = (tr->langopts.max_lengthmod*speed1);
			}

			length_mod = length_mod / 128;

			if (p->type != phVOWEL) {
				length_mod = 256; // syllabic consonant
				min_drop = 16;
			}
			p->length = length_mod;

			if (p->env >= (N_ENVELOPE_DATA-1)) {
				fprintf(stderr, "espeak: Bad intonation data\n");
				p->env = 0;
			}

			// pre-vocalic part
			// set last-pitch
			env2 = p->env + 1; // version for use with preceding semi-vowel

			if (p->tone_ph != 0) {
				InterpretPhoneme2(p->tone_ph, &phdata_tone);
				pitch_env = GetEnvelope(phdata_tone.pitch_env);
			} else
				pitch_env = envelope_data[env2];

			pitch_start = p->pitch1 + ((p->pitch2-p->pitch1)*pitch_env[0])/256;

			if (pre_sonorant || pre_voiced) {
				// set pitch for pre-vocalic part
				if (pitch_start == 255)
					last_pitch = pitch_start; // pitch is not set

				if (pitch_start - last_pitch > 16)
					last_pitch = pitch_start - 16;

				prev->pitch1 = last_pitch;
				prev->pitch2 = pitch_start;
				if (last_pitch < pitch_start) {
					prev->env = PITCHrise;
					p->env = env2;
				} else
					prev->env = PITCHfall;

				prev->length = length_mod;

				prev->amp = p->amp;
				if ((prev->type != phLIQUID) && (prev->amp > 18))
					prev->amp = 18;
			}

			// vowel & post-vocalic part
			next->synthflags &= ~SFLAG_SEQCONTINUE;
			if (next->type == phNASAL && next2->type != phVOWEL)
				next->synthflags |= SFLAG_SEQCONTINUE;

			if (next->type == phLIQUID) {
				next->synthflags |= SFLAG_SEQCONTINUE;

				if (next2->type == phVOWEL)
					next->synthflags &= ~SFLAG_SEQCONTINUE;

				if (next2->type != phVOWEL) {
					if (next->ph->mnemonic == ('/'*256+'r'))
						next->synthflags &= ~SFLAG_SEQCONTINUE;
				}
			}

			if ((min_drop > 0) && ((p->pitch2 - p->pitch1) < min_drop)) {
				pitch1 = p->pitch2 - min_drop;
				if (pitch1 < 0)
					pitch1 = 0;
				p->pitch1 = pitch1;
			}

			last_pitch = p->pitch1 + ((p->pitch2-p->pitch1)*envelope_data[p->env][127])/256;
			pre_sonorant = 0;
			pre_voiced = 0;
			break;
		}
	}
}