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https://github.com/libretro/scummvm.git
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609 lines
15 KiB
C++
609 lines
15 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001 Ludvig Strigeus
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* Copyright (C) 2001-2004 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#include "stdafx.h"
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#include "base/engine.h"
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#include "scumm/player_v1.h"
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#include "scumm/scumm.h"
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namespace Scumm {
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#define FB_WNOISE 0x12000 /* feedback for white noise */
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#define FB_PNOISE 0x08000 /* feedback for periodic noise */
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#define TIMER_BASE_FREQ 1193000
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#define FIXP_SHIFT 16
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Player_V1::Player_V1(ScummEngine *scumm, bool pcjr) : Player_V2(scumm, pcjr) {
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// Initialize channel code
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for (int i = 0; i < 4; ++i)
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clear_channel(i);
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_mplex_step = (_sample_rate << FIXP_SHIFT) / 1193000;
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_next_chunk = _repeat_chunk = 0;
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_forced_level = 0;
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_random_lsr = 0;
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}
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Player_V1::~Player_V1() {
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}
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void Player_V1::chainSound(int nr, byte *data) {
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uint i;
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for (i = 0; i < 4; ++i)
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clear_channel(i);
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_current_nr = nr;
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_current_data = data;
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_repeat_chunk = _next_chunk = data + (_pcjr ? 2 : 4);
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debug(4, "Chaining new sound %d", nr);
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if (_pcjr)
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parsePCjrChunk();
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else
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parseSpeakerChunk();
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}
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void Player_V1::startSound(int nr) {
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byte *data = _vm->getResourceAddress(rtSound, nr);
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assert(data);
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mutex_up();
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int offset = _pcjr ? READ_LE_UINT16(data+4) : 6;
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int cprio = _current_data ? *(_current_data) & 0x7f : 0;
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int prio = *(data + offset) & 0x7f;
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int restartable = *(data + offset) & 0x80;
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debug(4, "startSound %d: prio %d%s, cprio %d",
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nr, prio, restartable ? " restartable" : "", cprio);
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if (!_current_nr || cprio <= prio) {
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if (_current_data && (*(_current_data) & 0x80)) {
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_next_nr = _current_nr;
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_next_data = _current_data;
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}
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chainSound(nr, data + offset);
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}
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mutex_down();
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}
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void Player_V1::stopAllSounds() {
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mutex_up();
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for (int i = 0; i < 4; i++)
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clear_channel(i);
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_repeat_chunk = _next_chunk = 0;
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_next_nr = _current_nr = 0;
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_next_data = _current_data = 0;
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mutex_down();
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}
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void Player_V1::stopSound(int nr) {
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mutex_up();
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if (_next_nr == nr) {
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_next_nr = 0;
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_next_data = 0;
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}
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if (_current_nr == nr) {
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for (int i = 0; i < 4; i++) {
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clear_channel(i);
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}
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_repeat_chunk = _next_chunk = 0;
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_current_nr = 0;
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_current_data = 0;
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chainNextSound();
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}
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mutex_down();
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}
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void Player_V1::clear_channel(int i) {
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_channels[i].freq = 0;
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_channels[i].volume = 15;
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}
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int Player_V1::getMusicTimer() const {
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/* Do V1 games have a music timer? */
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return 0;
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}
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void Player_V1::parseSpeakerChunk() {
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set_mplex(3000);
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_forced_level = 0;
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parse_again:
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_chunk_type = READ_LE_UINT16(_next_chunk);
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debug(6, "parseSpeakerChunk: sound %d, offset %4x, chunk %x",
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_current_nr, _next_chunk - _current_data, _chunk_type);
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_next_chunk += 2;
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switch (_chunk_type) {
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case 0xffff:
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_current_nr = 0;
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_current_data = 0;
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_channels[0].freq = 0;
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_next_chunk = 0;
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chainNextSound();
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break;
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case 0xfffe:
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_repeat_chunk = _next_chunk;
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goto parse_again;
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case 0xfffd:
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_next_chunk = _repeat_chunk;
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goto parse_again;
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case 0xfffc:
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/* handle reset. We don't need this do we? */
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goto parse_again;
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case 0:
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_time_left = 1;
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set_mplex(READ_LE_UINT16(_next_chunk));
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_next_chunk += 2;
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break;
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case 1:
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set_mplex(READ_LE_UINT16(_next_chunk));
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_start = READ_LE_UINT16(_next_chunk + 2);
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_end = READ_LE_UINT16(_next_chunk + 4);
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_delta = (int16) READ_LE_UINT16(_next_chunk + 6);
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_repeat_ctr = READ_LE_UINT16(_next_chunk + 8);
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_channels[0].freq = _start;
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_next_chunk += 10;
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debug(6, "chunk 1: mplex %d, freq %d -> %d step %d x %d",
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_mplex, _start, _end, _delta, _repeat_ctr);
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break;
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case 2:
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_start = READ_LE_UINT16(_next_chunk);
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_end = READ_LE_UINT16(_next_chunk + 2);
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_delta = (int16) READ_LE_UINT16(_next_chunk + 4);
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_channels[0].freq = 0;
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_next_chunk += 6;
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_forced_level = -1;
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debug(6, "chunk 2: %d -> %d step %d",
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_start, _end, _delta);
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break;
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case 3:
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_start = READ_LE_UINT16(_next_chunk);
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_end = READ_LE_UINT16(_next_chunk + 2);
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_delta = (int16) READ_LE_UINT16(_next_chunk + 4);
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_channels[0].freq = 0;
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_next_chunk += 6;
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_forced_level = -1;
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debug(6, "chunk 3: %d -> %d step %d",
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_start, _end, _delta);
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break;
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}
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}
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void Player_V1::nextSpeakerCmd() {
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uint16 lsr;
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switch (_chunk_type) {
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case 0:
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if (--_time_left)
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return;
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_time_left = READ_LE_UINT16(_next_chunk);
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_next_chunk += 2;
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if (_time_left == 0xfffb) {
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/* handle 0xfffb?? */
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_time_left = READ_LE_UINT16(_next_chunk);
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_next_chunk += 2;
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}
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debug(7, "nextSpeakerCmd: chunk %d, offset %4x: notelen %d",
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_chunk_type, _next_chunk - 2 - _current_data, _time_left);
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if (_time_left == 0) {
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parseSpeakerChunk();
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} else {
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_channels[0].freq = READ_LE_UINT16(_next_chunk);
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_next_chunk += 2;
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debug(7, "freq_current: %d", _channels[0].freq);
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}
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break;
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case 1:
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_channels[0].freq = (_channels[0].freq + _delta) & 0xffff;
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if (_channels[0].freq == _end) {
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if (!--_repeat_ctr) {
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parseSpeakerChunk();
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return;
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}
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_channels[0].freq = _start;
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}
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break;
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case 2:
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_start = (_start + _delta) & 0xffff;
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if (_start == _end) {
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parseSpeakerChunk();
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return;
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}
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set_mplex(_start);
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_forced_level = -_forced_level;
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break;
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case 3:
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_start = (_start + _delta) & 0xffff;
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if (_start == _end) {
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parseSpeakerChunk();
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return;
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}
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lsr = _random_lsr + 0x9248;
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lsr = (lsr >> 3) | (lsr << 13);
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_random_lsr = lsr;
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set_mplex((_start & lsr) | 0x180);
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_forced_level = -_forced_level;
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break;
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}
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}
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void Player_V1::parsePCjrChunk() {
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uint tmp;
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uint i;
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set_mplex(3000);
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_forced_level = 0;
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parse_again:
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_chunk_type = READ_LE_UINT16(_next_chunk);
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debug(6, "parsePCjrChunk: sound %d, offset %4x, chunk %x",
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_current_nr, _next_chunk - _current_data, _chunk_type);
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_next_chunk += 2;
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switch (_chunk_type) {
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case 0xffff:
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for (i = 0; i < 4; ++i)
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clear_channel(i);
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_current_nr = 0;
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_current_data = 0;
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_repeat_chunk = _next_chunk = 0;
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chainNextSound();
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break;
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case 0xfffe:
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_repeat_chunk = _next_chunk;
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goto parse_again;
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case 0xfffd:
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_next_chunk = _repeat_chunk;
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goto parse_again;
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case 0xfffc:
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/* handle reset. We don't need this do we? */
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goto parse_again;
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case 0:
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set_mplex(READ_LE_UINT16(_next_chunk));
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_next_chunk += 2;
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for (i = 0; i < 4; i++) {
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tmp = READ_LE_UINT16(_next_chunk);
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_next_chunk += 2;
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if (tmp == 0xffff) {
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_channels[i].cmd_ptr = 0;
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continue;
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}
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_channels[i].attack = READ_LE_UINT16(_current_data + tmp);
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_channels[i].decay = READ_LE_UINT16(_current_data + tmp + 2);
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_channels[i].level = READ_LE_UINT16(_current_data + tmp + 4);
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_channels[i].sustain_1 = READ_LE_UINT16(_current_data + tmp + 6);
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_channels[i].sustain_2 = READ_LE_UINT16(_current_data + tmp + 8);
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_channels[i].notelen = 1;
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_channels[i].volume = 15;
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_channels[i].cmd_ptr = _current_data + tmp + 10;
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}
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break;
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case 1:
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set_mplex(READ_LE_UINT16(_next_chunk));
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tmp = READ_LE_UINT16(_next_chunk + 2);
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_channels[0].cmd_ptr = tmp != 0xffff ? _current_data + tmp : NULL;
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tmp = READ_LE_UINT16(_next_chunk + 4);
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_start = READ_LE_UINT16(_next_chunk + 6);
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_delta = (int16) READ_LE_UINT16(_next_chunk + 8);
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_time_left = READ_LE_UINT16(_next_chunk + 10);
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_next_chunk += 12;
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if (tmp >= 0xe0) {
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_channels[3].freq = tmp & 0xf;
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_value_ptr = &_channels[3].volume;
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} else {
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assert(!(tmp & 0x10));
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tmp = (tmp & 0x60) >> 5;
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_value_ptr = &_channels[tmp].freq;
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_channels[tmp].volume = 0;
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}
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*_value_ptr = _start;
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if (_channels[0].cmd_ptr) {
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tmp = READ_LE_UINT16(_channels[0].cmd_ptr);
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_start_2 = READ_LE_UINT16(_channels[0].cmd_ptr + 2);
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_delta_2 = (int16) READ_LE_UINT16(_channels[0].cmd_ptr + 4);
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_time_left_2 = READ_LE_UINT16(_channels[0].cmd_ptr + 6);
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_channels[0].cmd_ptr += 8;
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if (_value_ptr == &_channels[3].volume) {
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tmp = (tmp & 0x70) >> 4;
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if (tmp & 1)
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_value_ptr_2 = &_channels[tmp >> 1].volume;
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else
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_value_ptr_2 = &_channels[tmp >> 1].freq;
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} else {
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assert(!(tmp & 0x10));
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tmp = (tmp & 0x60) >> 5;
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_value_ptr_2 = &_channels[tmp].freq;
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_channels[tmp].volume = 0;
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}
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*_value_ptr_2 = _start_2;
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}
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debug(6, "chunk 1: %d: %d step %d for %d, %d: %d step %d for %d",
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_value_ptr - (uint*)_channels, _start, _delta, _time_left,
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_value_ptr_2 - (uint*)_channels, _start_2, _delta_2, _time_left_2);
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break;
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case 2:
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_start = READ_LE_UINT16(_next_chunk);
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_end = READ_LE_UINT16(_next_chunk + 2);
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_delta = (int16) READ_LE_UINT16(_next_chunk + 4);
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_channels[0].freq = 0;
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_next_chunk += 6;
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_forced_level = -1;
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debug(6, "chunk 2: %d -> %d step %d",
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_start, _end, _delta);
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break;
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case 3:
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set_mplex(READ_LE_UINT16(_next_chunk));
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tmp = READ_LE_UINT16(_next_chunk + 2);
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assert((tmp & 0xf0) == 0xe0);
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_channels[3].freq = tmp & 0xf;
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if ((tmp & 3) == 3) {
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_next_chunk += 2;
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_channels[2].freq = READ_LE_UINT16(_next_chunk + 2);
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}
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_channels[3].volume = READ_LE_UINT16(_next_chunk + 4);
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_repeat_ctr = READ_LE_UINT16(_next_chunk + 6);
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_delta = (int16) READ_LE_UINT16(_next_chunk + 8);
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_next_chunk += 10;
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break;
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}
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}
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void Player_V1::nextPCjrCmd() {
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uint i;
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int dummy;
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switch (_chunk_type) {
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case 0:
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for (i = 0; i < 4; i++) {
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if (!_channels[i].cmd_ptr)
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continue;
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if (!--_channels[i].notelen) {
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dummy = READ_LE_UINT16(_channels[i].cmd_ptr);
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if (dummy >= 0xfffe) {
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if (dummy == 0xfffe)
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_next_chunk = _current_data + 2;
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parsePCjrChunk();
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return;
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}
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_channels[i].notelen = 4 * dummy;
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dummy = READ_LE_UINT16(_channels[i].cmd_ptr + 2);
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if (dummy == 0) {
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_channels[i].hull_counter = 4;
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_channels[i].sustctr = _channels[i].sustain_2;
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} else {
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_channels[i].hull_counter = 1;
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_channels[i].freq = dummy;
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}
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debug(7, "chunk 0: channel %d play %d for %d",
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i, dummy, _channels[i].notelen);
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_channels[i].cmd_ptr += 4;
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}
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switch (_channels[i].hull_counter) {
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case 1:
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_channels[i].volume -= _channels[i].attack;
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if ((int) _channels[i].volume <= 0) {
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_channels[i].volume = 0;
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_channels[i].hull_counter++;
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}
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break;
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case 2:
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_channels[i].volume += _channels[i].decay;
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if (_channels[i].volume >= _channels[i].level) {
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_channels[i].volume = _channels[i].level;
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_channels[i].hull_counter++;
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}
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break;
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case 4:
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if (--_channels[i].sustctr < 0) {
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_channels[i].sustctr = _channels[i].sustain_2;
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_channels[i].volume += _channels[i].sustain_1;
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if ((int) _channels[i].volume >= 15) {
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_channels[i].volume = 15;
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_channels[i].hull_counter++;
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}
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}
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break;
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}
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}
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break;
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case 1:
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_start += _delta;
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*_value_ptr = _start;
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if (!--_time_left) {
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_start = READ_LE_UINT16(_next_chunk);
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_next_chunk += 2;
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if (_start == 0xffff) {
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parsePCjrChunk();
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return;
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}
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_delta = (int16) READ_LE_UINT16(_next_chunk);
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_time_left = READ_LE_UINT16(_next_chunk + 2);
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_next_chunk += 4;
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*_value_ptr = _start;
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}
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if (_channels[0].cmd_ptr) {
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_start_2 += _delta_2;
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*_value_ptr_2 = _start_2;
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if (!--_time_left_2) {
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_start_2 = READ_LE_UINT16(_channels[0].cmd_ptr);
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if (_start_2 == 0xffff) {
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_next_chunk = _channels[0].cmd_ptr + 2;
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parsePCjrChunk();
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return;
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}
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_delta_2 = (int16) READ_LE_UINT16(_channels[0].cmd_ptr + 2);
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_time_left_2 = READ_LE_UINT16(_channels[0].cmd_ptr + 4);
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_channels[0].cmd_ptr += 6;
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}
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}
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break;
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case 2:
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_start += _delta;
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if (_start == _end) {
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parsePCjrChunk();
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return;
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}
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set_mplex(_start);
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debug(7, "chunk 2: mplex %d curve %d", _start, _forced_level);
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_forced_level = -_forced_level;
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break;
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case 3:
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dummy = _channels[3].volume + _delta;
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if (dummy >= 15) {
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_channels[3].volume = 15;
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} else if (dummy <= 0) {
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_channels[3].volume = 0;
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} else {
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_channels[3].volume = dummy;
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break;
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}
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if (!--_repeat_ctr) {
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parsePCjrChunk();
|
|
return;
|
|
}
|
|
_delta = READ_LE_UINT16(_next_chunk);
|
|
_next_chunk += 2;
|
|
break;
|
|
}
|
|
}
|
|
|
|
void Player_V1::set_mplex(uint mplex) {
|
|
if (mplex == 0)
|
|
mplex = 65536;
|
|
_mplex = mplex;
|
|
_tick_len = _mplex_step * mplex;
|
|
}
|
|
|
|
void Player_V1::nextTick() {
|
|
if (_next_chunk) {
|
|
if (_pcjr)
|
|
nextPCjrCmd();
|
|
else
|
|
nextSpeakerCmd();
|
|
}
|
|
}
|
|
|
|
void Player_V1::generateSpkSamples(int16 *data, uint len) {
|
|
uint i;
|
|
|
|
memset(data, 0, 2 * sizeof(int16) * len);
|
|
if (_channels[0].freq == 0) {
|
|
if (_forced_level) {
|
|
int sample = _forced_level * _volumetable[0];
|
|
for (i = 0; i < len; i++)
|
|
data[2*i] = data[2*i+1] = sample;
|
|
debug(9, "speaker: %8x: forced one", _tick_len);
|
|
} else if (!_level) {
|
|
return;
|
|
}
|
|
} else {
|
|
squareGenerator(0, _channels[0].freq, 0, 0, data, len);
|
|
debug(9, "speaker: %8x: freq %d %.1f", _tick_len,
|
|
_channels[0].freq, 1193000.0 / _channels[0].freq);
|
|
}
|
|
lowPassFilter(data, len);
|
|
}
|
|
|
|
void Player_V1::generatePCjrSamples(int16 *data, uint len) {
|
|
uint i, j;
|
|
uint freq, vol;
|
|
bool hasdata = false;
|
|
|
|
memset(data, 0, 2 * sizeof(int16) * len);
|
|
|
|
if (_forced_level) {
|
|
int sample = _forced_level * _volumetable[0];
|
|
for (i = 0; i < len; i++)
|
|
data[2*i] = data[2*i+1] = sample;
|
|
hasdata = true;
|
|
debug(9, "channel[4]: %8x: forced one", _tick_len);
|
|
}
|
|
|
|
for (i = 1; i < 3; i++) {
|
|
freq = _channels[i].freq;
|
|
if (freq) {
|
|
for (j = 0; j < i; j++) {
|
|
if (freq == _channels[j].freq) {
|
|
/* 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].freq;
|
|
vol = _channels[i].volume;
|
|
if (!_volumetable[_channels[i].volume]) {
|
|
_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);
|
|
debug(9, "channel[%d]: %8x: freq %d %.1f ; volume %d",
|
|
i, _tick_len, freq, 111860.0 / freq, vol);
|
|
} else {
|
|
int noiseFB = (freq & 4) ? FB_WNOISE : FB_PNOISE;
|
|
int n = (freq & 3);
|
|
|
|
freq = (n == 3) ? 2 * (_channels[2].freq) : 1 << (5 + n);
|
|
hasdata = true;
|
|
squareGenerator(i, freq, vol, noiseFB, data, len);
|
|
debug(9, "channel[%d]: %x: noise freq %d %.1f ; volume %d",
|
|
i, _tick_len, freq, 111860.0 / freq, vol);
|
|
}
|
|
}
|
|
|
|
if (_level || hasdata)
|
|
lowPassFilter(data, len);
|
|
}
|
|
|
|
} // End of namespace Scumm
|