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6d392a73e2
scummvm/scumm/player_v2.cpp
Max Horn c10905b975 cleanup 
svn-id: r8662
2003-06-27 00:10:17 +00:00

962 lines
25 KiB
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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001-2003 The ScummVM project
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*/
#include "stdafx.h"
#include "common/engine.h"
#include "player_v2.h"
#include "scumm.h"
#include "sound/mixer.h"
#define FREQ_HZ 236 // Don't change!
#define SPK_DECAY 0xfa00 /* Depends on sample rate */
#define PCJR_DECAY 0xf600 /* Depends on sample rate */
#define FIXP_SHIFT 16
#define MAX_OUTPUT 0x7fff
#define NG_PRESET 0x0f35 /* noise generator preset */
#define FB_WNOISE 0x12000 /* feedback for white noise */
#define FB_PNOISE 0x08000 /* feedback for periodic noise */
const uint8 note_lengths[] = {
0,
0, 0, 2,
0, 3, 4,
5, 6, 8,
9, 12, 16,
18, 24, 32,
36, 48, 64,
72, 96
};
static const uint16 hull_offsets[] = {
0, 12, 24, 36, 48, 60,
72, 88, 104, 120, 136, 240,
152, 164
};
static const int16 hulls[] = {
// hull 0
3, -1, 0, 0, 0, 0, 0, 0,
0, -1, 0, 0,
// hull 1 (staccato)
3, -1, 0, 30, 0, -1, 0, 0,
0, -1, 0, 0,
// hull 2 (legato)
3, -1, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0,
// hull 3 (staccatissimo)
3, -1, 0, 2, 0, -1, 0, 0,
0, -1, 0, 0,
// hull 4
3, -1, 0, 6, 0, -1, 0, 0,
0, -1, 0, 0,
// hull 5
3, -1, 0, 10, 0, -1, 0, 0,
0, -1, 0, 0,
// hull 6
(int16) 60000, -1, -1000, 20, 0, 0, 0, 0,
(int16) 40000, -1, -5000, 5, 0, -1, 0, 0,
// hull 7
(int16) 50000, -1, 0, 8, 30000, -1, 0, 0,
28000, -1, -5000, 5, 0, -1, 0, 0,
// hull 8
(int16) 60000, -1, -2000, 16, 0, 0, 0, 0,
28000, -1, -6000, 5, 0, -1, 0, 0,
// hull 9
(int16) 55000, -1, 0, 8, (int16) 35000, -1, 0, 0,
(int16) 40000, -1, -2000, 10, 0, -1, 0, 0,
// hull 10
(int16) 60000, -1, 0, 4, -2000, 8, 0, 0,
(int16) 40000, -1, -6000, 5, 0, -1, 0, 0,
// hull 12
0, -1, 150, 340, -150, 340, 0, -1,
0, -1, 0, 0,
// hull 13 == 164
20000, -1, 4000, 7, 1000, 15, 0, 0,
(int16) 35000, -1, -2000, 15, 0, -1, 0, 0,
// hull misc = 180
(int16) 44000, -1, -4400, 10, 0, -1, 0, 0,
0, -1, 0, 0,
(int16) 53000, -1, -5300, 10, 0, -1, 0, 0,
0, -1, 0, 0,
(int16) 63000, -1, -6300, 10, 0, -1, 0, 0,
0, -1, 0, 0,
(int16) 44000, -1, -1375, 32, 0, -1, 0, 0,
0, -1, 0, 0,
(int16) 53000, -1, -1656, 32, 0, -1, 0, 0,
0, -1, 0, 0,
// hull 11 == 240
(int16) 63000, -1, -1968, 32, 0, -1, 0, 0,
0, -1, 0, 0,
(int16) 44000, -1, - 733, 60, 0, -1, 0, 0,
0, -1, 0, 0,
(int16) 53000, -1, - 883, 60, 0, -1, 0, 0,
0, -1, 0, 0,
(int16) 63000, -1, -1050, 60, 0, -1, 0, 0,
0, -1, 0, 0,
(int16) 44000, -1, - 488, 90, 0, -1, 0, 0,
0, -1, 0, 0,
(int16) 53000, -1, - 588, 90, 0, -1, 0, 0,
0, -1, 0, 0,
(int16) 63000, -1, - 700, 90, 0, -1, 0, 0,
0, -1, 0, 0
};
static const uint16 freqmod_lengths[] = {
0x1000, 0x1000, 0x20, 0x2000, 0x1000
};
static const uint16 freqmod_offsets[] = {
0, 0x100, 0x200, 0x302, 0x202
};
static const int8 freqmod_table[0x502] = {
0, 3, 6, 9, 12, 15, 18, 21,
24, 27, 30, 33, 36, 39, 42, 45,
48, 51, 54, 57, 59, 62, 65, 67,
70, 73, 75, 78, 80, 82, 85, 87,
89, 91, 94, 96, 98, 100, 102, 103,
105, 107, 108, 110, 112, 113, 114, 116,
117, 118, 119, 120, 121, 122, 123, 123,
124, 125, 125, 126, 126, 126, 126, 126,
126, 126, 126, 126, 126, 126, 125, 125,
124, 123, 123, 122, 121, 120, 119, 118,
117, 116, 114, 113, 112, 110, 108, 107,
105, 103, 102, 100, 98, 96, 94, 91,
89, 87, 85, 82, 80, 78, 75, 73,
70, 67, 65, 62, 59, 57, 54, 51,
48, 45, 42, 39, 36, 33, 30, 27,
24, 21, 18, 15, 12, 9, 6, 3,
0, -3, -6, -9, -12, -15, -18, -21,
-24, -27, -30, -33, -36, -39, -42, -45,
-48, -51, -54, -57, -59, -62, -65, -67,
-70, -73, -75, -78, -80, -82, -85, -87,
-89, -91, -94, -96, -98,-100,-102,-103,
-105,-107,-108,-110,-112,-113,-114,-116,
-117,-118,-119,-120,-121,-122,-123,-123,
-124,-125,-125,-126,-126,-126,-126,-126,
-126,-126,-126,-126,-126,-126,-125,-125,
-124,-123,-123,-122,-121,-120,-119,-118,
-117,-116,-114,-113,-112,-110,-108,-107,
-105,-103,-102,-100, -98, -96, -94, -91,
-89, -87, -85, -82, -80, -78, -75, -73,
-70, -67, -65, -62, -59, -57, -54, -51,
-48, -45, -42, -39, -36, -33, -30, -27,
-24, -21, -18, -15, -12, -9, -6, -3,
0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23,
24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 58, 59, 60, 61, 62, 63,
64, 65, 66, 67, 68, 69, 70, 71,
72, 73, 74, 75, 76, 77, 78, 79,
80, 81, 82, 83, 84, 85, 86, 87,
88, 89, 90, 91, 92, 93, 94, 95,
96, 97, 98, 99, 100, 101, 102, 103,
104, 105, 106, 107, 108, 109, 110, 111,
112, 113, 114, 115, 116, 117, 118, 119,
120, 121, 122, 123, 124, 125, 126, 127,
-128,-127,-126,-125,-124,-123,-122,-121,
-120,-119,-118,-117,-116,-115,-114,-113,
-112,-111,-110,-109,-108,-107,-106,-105,
-104,-103,-102,-101,-100, -99, -98, -97,
-96, -95, -94, -93, -92, -91, -90, -89,
-88, -87, -86, -85, -84, -83, -82, -81,
-80, -79, -78, -77, -76, -75, -74, -73,
-72, -71, -70, -69, -68, -67, -66, -65,
-64, -63, -62, -61, -60, -59, -58, -57,
-56, -55, -54, -53, -52, -51, -50, -49,
-48, -47, -46, -45, -44, -43, -42, -41,
-40, -39, -38, -37, -36, -35, -34, -33,
-32, -31, -30, -29, -28, -27, -26, -25,
-24, -23, -22, -21, -20, -19, -18, -17,
-16, -15, -14, -13, -12, -11, -10, -9,
-8, -7, -6, -5, -4, -3, -2, -1,
-120, 120,
-120,-120,-120,-120,-120,-120,-120,-120,
-120,-120,-120,-120,-120,-120,-120,-120,
-120,-120,-120,-120,-120,-120,-120,-120,
-120,-120,-120,-120,-120,-120,-120,-120,
-120,-120,-120,-120,-120,-120,-120,-120,
-120,-120,-120,-120,-120,-120,-120,-120,
-120,-120,-120,-120,-120,-120,-120,-120,
-120,-120,-120,-120,-120,-120,-120,-120,
-120,-120,-120,-120,-120,-120,-120,-120,
-120,-120,-120,-120,-120,-120,-120,-120,
-120,-120,-120,-120,-120,-120,-120,-120,
-120,-120,-120,-120,-120,-120,-120,-120,
-120,-120,-120,-120,-120,-120,-120,-120,
-120,-120,-120,-120,-120,-120,-120,-120,
-120,-120,-120,-120,-120,-120,-120,-120,
-120,-120,-120,-120,-120,-120,-120,-120,
120, 120, 120, 120, 120, 120, 120, 120,
120, 120, 120, 120, 120, 120, 120, 120,
120, 120, 120, 120, 120, 120, 120, 120,
120, 120, 120, 120, 120, 120, 120, 120,
120, 120, 120, 120, 120, 120, 120, 120,
120, 120, 120, 120, 120, 120, 120, 120,
120, 120, 120, 120, 120, 120, 120, 120,
120, 120, 120, 120, 120, 120, 120, 120,
120, 120, 120, 120, 120, 120, 120, 120,
120, 120, 120, 120, 120, 120, 120, 120,
120, 120, 120, 120, 120, 120, 120, 120,
120, 120, 120, 120, 120, 120, 120, 120,
120, 120, 120, 120, 120, 120, 120, 120,
120, 120, 120, 120, 120, 120, 120, 120,
120, 120, 120, 120, 120, 120, 120, 120,
120, 120, 120, 120, 120, 120, 120, 120,
41, 35, -66,-124, -31, 108, -42, -82,
82,-112, 73, -15, -15, -69, -23, -21,
-77, -90, -37, 60,-121, 12, 62,-103,
36, 94, 13, 28, 6, -73, 71, -34,
-77, 18, 77, -56, 67, -69,-117, -90,
31, 3, 90, 125, 9, 56, 37, 31,
93, -44, -53, -4,-106, -11, 69, 59,
19, 13,-119, 10, 28, -37, -82, 50,
32,-102, 80, -18, 64, 120, 54, -3,
18, 73, 50, -10, -98, 125, 73, -36,
-83, 79, 20, -14, 68, 64, 102, -48,
107, -60, 48, -73, 50, 59, -95, 34,
-10, 34,-111, -99, -31,-117, 31, -38,
-80, -54,-103, 2, -71, 114, -99, 73,
44,-128, 126, -59,-103, -43, -23,-128,
-78, -22, -55, -52, 83, -65, 103, -42,
-65, 20, -42, 126, 45, -36,-114, 102,
-125, -17, 87, 73, 97, -1, 105,-113,
97, -51, -47, 30, -99,-100, 22, 114,
114, -26, 29, -16,-124, 79, 74, 119,
2, -41, -24, 57, 44, 83, -53, -55,
18, 30, 51, 116, -98, 12, -12, -43,
-44, -97, -44, -92, 89, 126, 53, -49,
50, 34, -12, -52, -49, -45,-112, 45,
72, -45,-113, 117, -26, -39, 29, 42,
-27, -64, -9, 43, 120,-127,-121, 68,
14, 95, 80, 0, -44, 97,-115, -66,
123, 5, 21, 7, 59, 51,-126, 31,
24, 112,-110, -38, 100, 84, -50, -79,
-123, 62, 105, 21, -8, 70, 106, 4,
-106, 115, 14, -39, 22, 47, 103, 104,
-44, -9, 74, 74, -48, 87, 104, 118,
-6, 22, -69, 17, -83, -82, 36,-120,
121, -2, 82, -37, 37, 67, -27, 60,
-12, 69, -45, -40, 40, -50, 11, -11,
-59, 96, 89, 61,-105, 39,-118, 89,
118, 45, -48, -62, -55, -51, 104, -44,
73, 106, 121, 37, 8, 97, 64, 20,
-79, 59, 106, -91, 17, 40, -63,-116,
-42, -87, 11,-121,-105,-116, 47, -15,
21, 29,-102,-107, -63,-101, -31, -64,
126, -23, -88,-102, -89,-122, -62, -75,
84, -65,-102, -25, -39, 35, -47, 85,
-112, 56, 40, -47, -39, 108, -95, 102,
94, 78, -31, 48,-100, -2, -39, 113,
-97, -30, -91, -30, 12,-101, -76, 71,
101, 56, 42, 70,-119, -87,-126, 121,
122, 118, 120, -62, 99, -79, 38, -33,
-38, 41, 109, 62, 98, -32,-106, 18,
52, -65, 57, -90, 63,-119, 94, -15,
109, 14, -29, 108, 40, -95, 30, 32,
29, -53, -62, 3, 63, 65, 7,-124,
15, 20, 5, 101, 27, 40, 97, -55,
-59, -25, 44,-114, 70, 54, 8, -36,
-13, -88,-115, -2, -66, -14, -21, 113,
-1, -96, -48, 59, 117, 6,-116, 126,
-121, 120, 115, 77, -48, -66,-126, -66,
-37, -62, 70, 65, 43,-116, -6, 48,
127, 112, -16, -89, 84,-122, 50,-107,
-86, 91, 104, 19, 11, -26, -4, -11,
-54, -66, 125, -97,-119,-118, 65, 27,
-3, -72, 79, 104, -10, 114, 123, 20,
-103, -51, -45, 13, -16, 68, 58, -76,
-90, 102, 83, 51, 11, -53, -95, 16
};
static const uint16 spk_freq_table[12] = {
36484, 34436, 32503, 30679, 29007, 27332,
25798, 24350, 22983, 21693, 20476, 19326
};
static const uint16 pcjr_freq_table[12] = {
65472, 61760, 58304, 55040, 52032, 49024,
46272, 43648, 41216, 38912, 36736, 34624
};
////////////////////////////////////////
//
// V2 PC-Speaker MIDI driver
//
////////////////////////////////////////
Player_V2::Player_V2(Scumm *scumm) {
int i;
// This simulates the pc speaker sound, which is driven
// by the 8253 (square wave generator) and a low-band filter.
_isV3Game = (scumm->_version == 3);
_system = scumm->_system;
_mixer = scumm->_mixer;
_sample_rate = _system->property(OSystem::PROP_GET_SAMPLE_RATE, 0);
_mutex = _system->create_mutex();
_header_len = (scumm->_features & GF_OLD_BUNDLE) ? 4 : 6;
// Initialize sound queue
current_nr = next_nr = 0;
current_data = next_data = 0;
// Initialize channel code
for (i = 0; i < 4; ++i)
clear_channel(i);
_next_tick = 0;
_tick_len = (_sample_rate << FIXP_SHIFT) / FREQ_HZ;
// Initialize V3 music timer
_music_timer_ctr = _music_timer = 0;
_ticks_per_music_timer = 65535;
// Initialize square generator
_level = 0;
_RNG = NG_PRESET;
set_pcjr(true);
set_master_volume(255);
_mixer->setupPremix(this, premix_proc);
}
Player_V2::~Player_V2() {
mutex_up();
// Detach the premix callback handler
_mixer->setupPremix(0, 0);
mutex_down();
_system->delete_mutex (_mutex);
}
void Player_V2::set_pcjr(bool pcjr) {
mutex_up();
_pcjr = pcjr;
if (_pcjr) {
_decay = PCJR_DECAY;
_update_step = (_sample_rate << FIXP_SHIFT) / (111860 * 2);
_freqs_table = pcjr_freq_table;
} else {
_decay = SPK_DECAY;
_update_step = (_sample_rate << FIXP_SHIFT) / (1193000 * 2);
_freqs_table = spk_freq_table;
}
/* adapt _decay to sample rate. It must be squared when
* sample rate doubles.
*/
int i;
for (i = 0; (_sample_rate << i) < 30000; i++)
_decay = _decay * _decay / 65536;
_timer_output = 0;
for (i = 0; i < 4; i++)
_timer_count[i] = 0;
if (current_data)
restartSound();
mutex_down();
}
void Player_V2::set_master_volume (int vol) {
if (vol > 255)
vol = 255;
/* scale to int16, FIXME: find best value */
double out = vol * 128 / 3;
/* build volume table (2dB per step) */
for (int i = 0; i < 15; i++) {
/* limit volume to avoid clipping */
if (out > 0x7fff)
_volumetable[i] = 0x7fff;
else
_volumetable[i] = (int) out;
out /= 1.258925412; /* = 10 ^ (2/20) = 2dB */
}
_volumetable[15] = 0;
}
void Player_V2::chainSound(int nr, byte *data) {
int offset = _header_len + (_pcjr ? 10 : 2);
current_nr = nr;
current_data = data;
for (int i = 0; i < 4; i++) {
clear_channel(i);
channels[i].d.music_script_nr = nr;
if (data) {
channels[i].d.next_cmd = READ_LE_UINT16(data+offset+2*i);
if (channels[i].d.next_cmd)
channels[i].d.time_left = 1;
}
}
_music_timer = 0;
}
void Player_V2::chainNextSound() {
if (next_nr) {
chainSound(next_nr, next_data);
next_nr = 0;
next_data = 0;
}
}
void Player_V2::stopAllSounds() {
mutex_up();
for (int i = 0; i < 4; i++) {
clear_channel(i);
}
next_nr = current_nr = 0;
next_data = current_data = 0;
mutex_down();
}
void Player_V2::stopSound(int nr) {
mutex_up();
if (next_nr == nr) {
next_nr = 0;
next_data = 0;
}
if (current_nr == nr) {
for (int i = 0; i < 4; i++) {
clear_channel(i);
}
current_nr = 0;
current_data = 0;
chainNextSound();
}
mutex_down();
}
void Player_V2::startSound(int nr, byte *data) {
mutex_up();
int cprio = current_data ? *(current_data + _header_len) : 0;
int prio = *(data + _header_len);
int nprio = next_data ? *(next_data + _header_len) : 0;
int restartable = *(data + _header_len + 1);
if (!current_nr || cprio <= prio) {
int tnr = current_nr;
int tprio = cprio;
byte *tdata = current_data;
chainSound(nr, data);
nr = tnr;
prio = tprio;
data = tdata;
restartable = data ? *(data + _header_len + 1) : 0;
}
if (!current_nr) {
nr = 0;
next_nr = 0;
next_data = 0;
}
if (nr != current_nr
&& restartable
&& (!next_nr
|| nprio <= prio)) {
next_nr = nr;
next_data = data;
}
mutex_down();
}
void Player_V2::restartSound() {
if (*(current_data + _header_len + 1)) {
/* current sound is restartable */
chainSound(current_nr, current_data);
} else {
chainNextSound();
}
}
bool Player_V2::getSoundStatus(int nr) const {
return current_nr == nr || next_nr == nr;
}
void Player_V2::premix_proc(void *param, int16 *buf, uint len) {
((Player_V2 *) param)->do_mix(buf, len);
}
void Player_V2::clear_channel(int i) {
ChannelInfo *channel = &channels[i];
channel->d.time_left = 0;
channel->d.next_cmd = 0;
channel->d.base_freq = 0;
channel->d.freq_delta = 0;
channel->d.freq = 0;
channel->d.volume = 0;
channel->d.volume_delta = 0;
channel->d.inter_note_pause = 0;
channel->d.transpose = 0;
channel->d.hull_curve = 0;
channel->d.hull_offset = 0;
channel->d.hull_counter = 0;
channel->d.freqmod_table = 0;
channel->d.freqmod_offset = 0;
channel->d.freqmod_incr = 0;
channel->d.freqmod_multiplier = 0;
channel->d.freqmod_modulo = 0;
}
int Player_V2::getMusicTimer() const {
if (_isV3Game)
return _music_timer;
else
return channels[0].d.music_timer;
}
void Player_V2::execute_cmd(ChannelInfo *channel) {
uint16 value;
int16 offset;
uint8 *script_ptr;
ChannelInfo * current_channel;
ChannelInfo * dest_channel;
current_channel = channel;
if (channel->d.next_cmd == 0)
return;
script_ptr = &current_data[channel->d.next_cmd];
for (;;) {
uint8 opcode = *script_ptr++;
if (opcode >= 0xf8) {
switch (opcode) {
case 0xf8: // set hull curve
debug(9, "channels[%d]: hull curve %2d",
channel - channels, *script_ptr);
channel->d.hull_curve = hull_offsets[*script_ptr/2];
script_ptr++;
break;
case 0xf9: // set freqmod curve
debug(9, "channels[%d]: freqmod curve %2d",
channel - channels, *script_ptr);
channel->d.freqmod_table = freqmod_offsets[*script_ptr/4];
channel->d.freqmod_modulo = freqmod_lengths[*script_ptr/4];
script_ptr++;
break;
case 0xfd: // clear other channel
value = READ_LE_UINT16 (script_ptr);
debug(9, "clear channel %d", value/50);
script_ptr += 2;
channel = &channels[value / sizeof(ChannelInfo)];
// fall through
case 0xfa: // clear current channel
if (opcode == 0xfa)
debug(9, "clear channel");
channel->d.next_cmd = 0;
channel->d.base_freq = 0;
channel->d.freq_delta = 0;
channel->d.freq = 0;
channel->d.volume = 0;
channel->d.volume_delta = 0;
channel->d.inter_note_pause = 0;
channel->d.transpose = 0;
channel->d.hull_curve = 0;
channel->d.hull_offset = 0;
channel->d.hull_counter = 0;
channel->d.freqmod_table = 0;
channel->d.freqmod_offset = 0;
channel->d.freqmod_incr = 0;
channel->d.freqmod_multiplier = 0;
channel->d.freqmod_modulo = 0;
break;
case 0xfb: // ret from subroutine
debug(9, "ret from sub");
script_ptr = retaddr;
break;
case 0xfc: // call subroutine
offset = READ_LE_UINT16 (script_ptr);
debug(9, "subroutine %d", offset);
script_ptr += 2;
retaddr = script_ptr;
script_ptr = current_data + offset;
debug(9, "XXX1: %p -> %04x", script_ptr, offset);
break;
case 0xfe: // loop music
opcode = *script_ptr++;
offset = READ_LE_UINT16 (script_ptr);
script_ptr += 2;
debug(9, "loop if %d to %d", opcode, offset);
if (!channel->array[opcode/2] || --channel->array[opcode/2])
script_ptr += offset;
break;
case 0xff: // set parameter
opcode = *script_ptr++;
value = READ_LE_UINT16 (script_ptr);
channel->array[opcode/2] = value;
debug(9, "channels[%d]: set param %2d = %5d",
channel - &channels[0], opcode, value);
script_ptr += 2;
if (opcode == 14) {
/* tempo var */
_ticks_per_music_timer = 125;
}
if (opcode == 0)
goto end;
break;
}
} else { // opcode < 0xf8
for (;;) {
int16 note, octave;
int is_last_note;
dest_channel = &channels[(opcode >> 5) & 3];
if (!(opcode & 0x80)) {
int tempo = channel->d.tempo;
if (!tempo)
tempo = 1;
channel->d.time_left = tempo * note_lengths[opcode & 0x1f];
note = *script_ptr++;
is_last_note = note & 0x80;
note &= 0x7f;
if (note == 0x7f)
goto end;
} else {
channel->d.time_left = ((opcode & 7) << 8) | *script_ptr++;
if ((opcode & 0x10))
goto end;
is_last_note = 0;
note = (*script_ptr++) & 0x7f;
}
debug(9, "channels[%d]: @%04x note: %3d+%d len: %2d hull: %d mod: %d/%d/%d %s",
dest_channel - channel, script_ptr ? script_ptr - current_data - 2 : 0,
note, (signed short) dest_channel->d.transpose, channel->d.time_left,
dest_channel->d.hull_curve, dest_channel->d.freqmod_table,
dest_channel->d.freqmod_incr,dest_channel->d.freqmod_multiplier,
is_last_note ? "last":"");
uint16 myfreq;
dest_channel->d.time_left = channel->d.time_left;
dest_channel->d.note_length =
channel->d.time_left - dest_channel->d.inter_note_pause;
note += dest_channel->d.transpose;
while (note < 0)
note += 12;
octave = note / 12;
note = note % 12;
dest_channel->d.hull_offset = 0;
dest_channel->d.hull_counter = 1;
if (_pcjr && dest_channel == &channels[3]) {
dest_channel->d.hull_curve = 180 + note * 12;
myfreq = 384 - 64 * octave;
} else {
myfreq = _freqs_table[note] >> octave;
}
dest_channel->d.freq = dest_channel->d.base_freq = myfreq;
if (is_last_note)
goto end;
opcode = *script_ptr++;
}
}
}
end:
channel = current_channel;
if (channel->d.time_left)
goto finish;
channel->d.next_cmd = 0;
int i;
for (i = 0; i< 4; i++) {
if (channels[i].d.time_left)
goto finish;
}
current_nr = 0;
current_data = 0;
chainNextSound();
return;
finish:
channel->d.next_cmd = script_ptr - current_data;
return;
}
void Player_V2::next_freqs(ChannelInfo *channel) {
channel->d.volume += channel->d.volume_delta;
channel->d.base_freq += channel->d.freq_delta;
channel->d.freqmod_offset += channel->d.freqmod_incr;
if (channel->d.freqmod_offset > channel->d.freqmod_modulo)
channel->d.freqmod_offset -= channel->d.freqmod_modulo;
channel->d.freq =
(int) (freqmod_table[channel->d.freqmod_table + (channel->d.freqmod_offset >> 4)])
* (int) channel->d.freqmod_multiplier / 256
+ channel->d.base_freq;
debug(9, "Freq: %d/%d, %d/%d/%d*%d %d",
channel->d.base_freq, (int16)channel->d.freq_delta,
channel->d.freqmod_table, channel->d.freqmod_offset,
channel->d.freqmod_incr, channel->d.freqmod_multiplier,
channel->d.freq);
if (channel->d.note_length && !--channel->d.note_length) {
channel->d.hull_offset = 16;
channel->d.hull_counter = 1;
}
if (!--channel->d.time_left) {
execute_cmd(channel);
}
#if 0
debug(9, "channels[%d]: freq %d hull %d/%d/%d",
channel - &channels[0], channel->d.freq,
channel->d.hull_curve, channel->d.hull_offset,
channel->d.hull_counter);
#endif
if (channel->d.hull_counter && !--channel->d.hull_counter) {
for (;;) {
const int16 *hull_ptr = hulls
+ channel->d.hull_curve + channel->d.hull_offset/2;
if (hull_ptr[1] == -1) {
channel->d.volume = hull_ptr[0];
if (hull_ptr[0] == 0)
channel->d.volume_delta = 0;
channel->d.hull_offset += 4;
} else {
channel->d.volume_delta = hull_ptr[0];
channel->d.hull_counter = hull_ptr[1];
channel->d.hull_offset += 4;
break;
}
}
}
}
void Player_V2::do_mix (int16 *data, int len) {
mutex_up();
int step;
do {
step = len;
if (step > (_next_tick >> FIXP_SHIFT))
step = (_next_tick >> FIXP_SHIFT);
if (_pcjr)
generatePCjrSamples(data, step);
else
generateSpkSamples(data, step);
data += step;
_next_tick -= step << FIXP_SHIFT;
if (!(_next_tick >> FIXP_SHIFT)) {
for (int i = 0; i < 4; i++) {
if (!channels[i].d.time_left)
continue;
next_freqs(&channels[i]);
}
_next_tick += _tick_len;
if (_music_timer_ctr++ >= _ticks_per_music_timer) {
_music_timer_ctr = 0;
_music_timer++;
}
}
} while (len -= step);
mutex_down();
}
void Player_V2::lowPassFilter(int16 *sample, int len) {
for (int i = 0; i < len; i++) {
_level = (_level * _decay
+ (unsigned int)sample[i] * (0x10000-_decay)) >> 16;
sample[i] = _level;
}
}
void Player_V2::squareGenerator(int channel, int freq, int vol,
int noiseFeedback, int16 *sample, int len) {
int period = _update_step * freq;
if (period == 0)
period = _update_step;
for (int i = 0; i < len; i++) {
unsigned int duration = 0;
if (_timer_output & (1 << channel))
duration += _timer_count[channel];
_timer_count[channel] -= (1 << FIXP_SHIFT);
while (_timer_count[channel] <= 0) {
if (noiseFeedback) {
if (_RNG & 1) {
_RNG ^= noiseFeedback;
_timer_output ^= (1 << channel);
}
_RNG >>= 1;
} else {
_timer_output ^= (1 << channel);
}
if (_timer_output & (1 << channel))
duration += period;
_timer_count[channel] += period;
}
if (_timer_output & (1 << channel))
duration -= _timer_count[channel];
sample[i] += (duration * _volumetable[vol]) >> FIXP_SHIFT;
if (sample[i] < 0) {
/* overflow: clip value */
sample[i] = 0x7fff;
}
}
}
void Player_V2::generateSpkSamples(int16 *data, int len) {
int winning_channel = -1;
for (int i = 0; i < 4; i++) {
if (winning_channel == -1
&& channels[i].d.volume
&& channels[i].d.time_left) {
winning_channel = i;
}
}
memset (data, 0, sizeof(int16) * len);
if (winning_channel != -1) {
squareGenerator(0, channels[winning_channel].d.freq, 0,
0, data, len);
} else if (_level == 0)
/* shortcut: no sound is being played. */
return;
lowPassFilter(data, len);
}
void Player_V2::generatePCjrSamples(int16 *data, int len) {
int i, j;
int freq, vol;
memset(data, 0, sizeof(int16) * len);
bool hasdata = false;
for (i = 1; i < 3; i++) {
freq = channels[i].d.freq >> 6;
if (channels[i].d.volume && channels[i].d.time_left) {
for (j = 0; j < i; j++) {
if (channels[j].d.volume
&& channels[j].d.time_left
&& freq == (channels[j].d.freq >> 6)) {
/* HACK: this channel is playing at
* the same frequency as another.
* Synchronize it to the same phase to
* prevent interference.
*/
_timer_count[i] = _timer_count[j];
_timer_output ^= (1 << i) &
(_timer_output ^ _timer_output << (i - j));
}
}
}
}
for (i = 0; i < 4; i++) {
freq = channels[i].d.freq >> 6;
vol = (65535 - channels[i].d.volume) >> 12;
if (!channels[i].d.volume || !channels[i].d.time_left) {
_timer_count[i] -= len << FIXP_SHIFT;
if (_timer_count[i] < 0)
_timer_count[i] = 0;
} else if (i < 3) {
hasdata = true;
squareGenerator(i, freq, vol, 0, data, len);
} else {
int noiseFB = (freq & 4) ? FB_WNOISE : FB_PNOISE;
int n = (freq & 3);
freq = (n == 3) ? 2 * (channels[2].d.freq>>6) : 1 << (5 + n);
hasdata = true;
squareGenerator(i, freq, vol, noiseFB, data, len);
}
#if 0
debug(9, "channel[%d]: freq %d %.1f ; volume %d",
i, freq, 111860.0/freq, vol);
#endif
}
if (_level || hasdata)
lowPassFilter(data, len);
}
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