diff options
Diffstat (limited to 'engines/scumm/players/player_v1.cpp')
| -rw-r--r-- | engines/scumm/players/player_v1.cpp | 607 |
1 files changed, 607 insertions, 0 deletions
diff --git a/engines/scumm/players/player_v1.cpp b/engines/scumm/players/player_v1.cpp new file mode 100644 index 0000000000..0fa1ee9361 --- /dev/null +++ b/engines/scumm/players/player_v1.cpp @@ -0,0 +1,607 @@ +/* ScummVM - Graphic Adventure Engine + * + * ScummVM is the legal property of its developers, whose names + * are too numerous to list here. Please refer to the COPYRIGHT + * file distributed with this source distribution. + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + */ + + +#include "engines/engine.h" +#include "scumm/players/player_v1.h" +#include "scumm/scumm.h" + +namespace Scumm { + +#define FB_WNOISE 0x12000 /* feedback for white noise */ +#define FB_PNOISE 0x08000 /* feedback for periodic noise */ + +#define TIMER_BASE_FREQ 1193000 +#define FIXP_SHIFT 16 + +Player_V1::Player_V1(ScummEngine *scumm, Audio::Mixer *mixer, bool pcjr) + : Player_V2(scumm, mixer, pcjr) { + // Initialize channel code + for (int i = 0; i < 4; ++i) + clear_channel(i); + + _mplex_step = (_sampleRate << FIXP_SHIFT) / 1193000; + _next_chunk = _repeat_chunk = 0; + _forced_level = 0; + _random_lsr = 0; +} + +Player_V1::~Player_V1() { +} + +void Player_V1::chainSound(int nr, byte *data) { + uint i; + for (i = 0; i < 4; ++i) + clear_channel(i); + + _current_nr = nr; + _current_data = data; + _repeat_chunk = _next_chunk = data + (_pcjr ? 2 : 4); + + debug(4, "Chaining new sound %d", nr); + if (_pcjr) + parsePCjrChunk(); + else + parseSpeakerChunk(); +} + +void Player_V1::startSound(int nr) { + Common::StackLock lock(_mutex); + + byte *data = _vm->getResourceAddress(rtSound, nr); + assert(data); + + int offset = _pcjr ? READ_LE_UINT16(data+4) : 6; + int cprio = _current_data ? *(_current_data) & 0x7f : 0; + int prio = *(data + offset) & 0x7f; + int restartable = *(data + offset) & 0x80; + + debug(4, "startSound %d: prio %d%s, cprio %d", + nr, prio, restartable ? " restartable" : "", cprio); + + if (!_current_nr || cprio <= prio) { + if (_current_data && (*(_current_data) & 0x80)) { + _next_nr = _current_nr; + _next_data = _current_data; + } + + chainSound(nr, data + offset); + } +} + +void Player_V1::stopAllSounds() { + Common::StackLock lock(_mutex); + + for (int i = 0; i < 4; i++) + clear_channel(i); + _repeat_chunk = _next_chunk = 0; + _next_nr = _current_nr = 0; + _next_data = _current_data = 0; +} + +void Player_V1::stopSound(int nr) { + Common::StackLock lock(_mutex); + + if (_next_nr == nr) { + _next_nr = 0; + _next_data = 0; + } + if (_current_nr == nr) { + for (int i = 0; i < 4; i++) { + clear_channel(i); + } + _repeat_chunk = _next_chunk = 0; + _current_nr = 0; + _current_data = 0; + chainNextSound(); + } +} + +void Player_V1::clear_channel(int i) { + _channels[i].freq = 0; + _channels[i].volume = 15; +} + +int Player_V1::getMusicTimer() { + /* Do V1 games have a music timer? */ + return 0; +} + +void Player_V1::parseSpeakerChunk() { + set_mplex(3000); + _forced_level = 0; + + parse_again: + _chunk_type = READ_LE_UINT16(_next_chunk); + debug(6, "parseSpeakerChunk: sound %d, offset %lx, chunk %x", + _current_nr, (long)(_next_chunk - _current_data), _chunk_type); + + _next_chunk += 2; + switch (_chunk_type) { + case 0xffff: + _current_nr = 0; + _current_data = 0; + _channels[0].freq = 0; + _next_chunk = 0; + chainNextSound(); + break; + case 0xfffe: + _repeat_chunk = _next_chunk; + goto parse_again; + + case 0xfffd: + _next_chunk = _repeat_chunk; + goto parse_again; + + case 0xfffc: + /* handle reset. We don't need this do we? */ + goto parse_again; + + case 0: + _time_left = 1; + set_mplex(READ_LE_UINT16(_next_chunk)); + _next_chunk += 2; + break; + case 1: + set_mplex(READ_LE_UINT16(_next_chunk)); + _start = READ_LE_UINT16(_next_chunk + 2); + _end = READ_LE_UINT16(_next_chunk + 4); + _delta = (int16) READ_LE_UINT16(_next_chunk + 6); + _repeat_ctr = READ_LE_UINT16(_next_chunk + 8); + _channels[0].freq = _start; + _next_chunk += 10; + debug(6, "chunk 1: mplex %d, freq %d -> %d step %d x %d", + _mplex, _start, _end, _delta, _repeat_ctr); + break; + case 2: + _start = READ_LE_UINT16(_next_chunk); + _end = READ_LE_UINT16(_next_chunk + 2); + _delta = (int16) READ_LE_UINT16(_next_chunk + 4); + _channels[0].freq = 0; + _next_chunk += 6; + _forced_level = -1; + debug(6, "chunk 2: %d -> %d step %d", + _start, _end, _delta); + break; + case 3: + _start = READ_LE_UINT16(_next_chunk); + _end = READ_LE_UINT16(_next_chunk + 2); + _delta = (int16) READ_LE_UINT16(_next_chunk + 4); + _channels[0].freq = 0; + _next_chunk += 6; + _forced_level = -1; + debug(6, "chunk 3: %d -> %d step %d", + _start, _end, _delta); + break; + } +} + +void Player_V1::nextSpeakerCmd() { + uint16 lsr; + switch (_chunk_type) { + case 0: + if (--_time_left) + return; + _time_left = READ_LE_UINT16(_next_chunk); + _next_chunk += 2; + if (_time_left == 0xfffb) { + /* handle 0xfffb?? */ + _time_left = READ_LE_UINT16(_next_chunk); + _next_chunk += 2; + } + debug(7, "nextSpeakerCmd: chunk %d, offset %4lx: notelen %d", + _chunk_type, (long)(_next_chunk - 2 - _current_data), _time_left); + if (_time_left == 0) { + parseSpeakerChunk(); + } else { + _channels[0].freq = READ_LE_UINT16(_next_chunk); + _next_chunk += 2; + debug(7, "freq_current: %d", _channels[0].freq); + } + break; + + case 1: + _channels[0].freq = (_channels[0].freq + _delta) & 0xffff; + if (_channels[0].freq == _end) { + if (!--_repeat_ctr) { + parseSpeakerChunk(); + return; + } + _channels[0].freq = _start; + } + break; + + case 2: + _start = (_start + _delta) & 0xffff; + if (_start == _end) { + parseSpeakerChunk(); + return; + } + set_mplex(_start); + _forced_level = -_forced_level; + break; + case 3: + _start = (_start + _delta) & 0xffff; + if (_start == _end) { + parseSpeakerChunk(); + return; + } + lsr = _random_lsr + 0x9248; + lsr = (lsr >> 3) | (lsr << 13); + _random_lsr = lsr; + set_mplex((_start & lsr) | 0x180); + _forced_level = -_forced_level; + break; + } +} + +void Player_V1::parsePCjrChunk() { + uint tmp; + uint i; + + set_mplex(3000); + _forced_level = 0; + +parse_again: + + _chunk_type = READ_LE_UINT16(_next_chunk); + debug(6, "parsePCjrChunk: sound %d, offset %4lx, chunk %x", + _current_nr, (long)(_next_chunk - _current_data), _chunk_type); + + _next_chunk += 2; + switch (_chunk_type) { + case 0xffff: + for (i = 0; i < 4; ++i) + clear_channel(i); + _current_nr = 0; + _current_data = 0; + _repeat_chunk = _next_chunk = 0; + chainNextSound(); + break; + + case 0xfffe: + _repeat_chunk = _next_chunk; + goto parse_again; + + case 0xfffd: + _next_chunk = _repeat_chunk; + goto parse_again; + + case 0xfffc: + /* handle reset. We don't need this do we? */ + goto parse_again; + + case 0: + set_mplex(READ_LE_UINT16(_next_chunk)); + _next_chunk += 2; + for (i = 0; i < 4; i++) { + tmp = READ_LE_UINT16(_next_chunk); + _next_chunk += 2; + if (tmp == 0xffff) { + _channels[i].cmd_ptr = 0; + continue; + } + _channels[i].attack = READ_LE_UINT16(_current_data + tmp); + _channels[i].decay = READ_LE_UINT16(_current_data + tmp + 2); + _channels[i].level = READ_LE_UINT16(_current_data + tmp + 4); + _channels[i].sustain_1 = READ_LE_UINT16(_current_data + tmp + 6); + _channels[i].sustain_2 = READ_LE_UINT16(_current_data + tmp + 8); + _channels[i].notelen = 1; + _channels[i].volume = 15; + _channels[i].cmd_ptr = _current_data + tmp + 10; + } + break; + + case 1: + set_mplex(READ_LE_UINT16(_next_chunk)); + tmp = READ_LE_UINT16(_next_chunk + 2); + _channels[0].cmd_ptr = tmp != 0xffff ? _current_data + tmp : NULL; + tmp = READ_LE_UINT16(_next_chunk + 4); + _start = READ_LE_UINT16(_next_chunk + 6); + _delta = (int16) READ_LE_UINT16(_next_chunk + 8); + _time_left = READ_LE_UINT16(_next_chunk + 10); + _next_chunk += 12; + if (tmp >= 0xe0) { + _channels[3].freq = tmp & 0xf; + _value_ptr = &_channels[3].volume; + } else { + assert(!(tmp & 0x10)); + tmp = (tmp & 0x60) >> 5; + _value_ptr = &_channels[tmp].freq; + _channels[tmp].volume = 0; + } + *_value_ptr = _start; + if (_channels[0].cmd_ptr) { + tmp = READ_LE_UINT16(_channels[0].cmd_ptr); + _start_2 = READ_LE_UINT16(_channels[0].cmd_ptr + 2); + _delta_2 = (int16) READ_LE_UINT16(_channels[0].cmd_ptr + 4); + _time_left_2 = READ_LE_UINT16(_channels[0].cmd_ptr + 6); + _channels[0].cmd_ptr += 8; + if (_value_ptr == &_channels[3].volume) { + tmp = (tmp & 0x70) >> 4; + if (tmp & 1) + _value_ptr_2 = &_channels[tmp >> 1].volume; + else + _value_ptr_2 = &_channels[tmp >> 1].freq; + } else { + assert(!(tmp & 0x10)); + tmp = (tmp & 0x60) >> 5; + _value_ptr_2 = &_channels[tmp].freq; + _channels[tmp].volume = 0; + } + *_value_ptr_2 = _start_2; + } + debug(6, "chunk 1: %lu: %d step %d for %d, %lu: %d step %d for %d", + (long)(_value_ptr - (uint *)_channels), _start, _delta, _time_left, + (long)(_value_ptr_2 - (uint *)_channels), _start_2, _delta_2, _time_left_2); + break; + + case 2: + _start = READ_LE_UINT16(_next_chunk); + _end = READ_LE_UINT16(_next_chunk + 2); + _delta = (int16) READ_LE_UINT16(_next_chunk + 4); + _channels[0].freq = 0; + _next_chunk += 6; + _forced_level = -1; + debug(6, "chunk 2: %d -> %d step %d", + _start, _end, _delta); + break; + case 3: + set_mplex(READ_LE_UINT16(_next_chunk)); + tmp = READ_LE_UINT16(_next_chunk + 2); + assert((tmp & 0xf0) == 0xe0); + _channels[3].freq = tmp & 0xf; + if ((tmp & 3) == 3) { + _next_chunk += 2; + _channels[2].freq = READ_LE_UINT16(_next_chunk + 2); + } + _channels[3].volume = READ_LE_UINT16(_next_chunk + 4); + _repeat_ctr = READ_LE_UINT16(_next_chunk + 6); + _delta = (int16) READ_LE_UINT16(_next_chunk + 8); + _next_chunk += 10; + break; + } +} + +void Player_V1::nextPCjrCmd() { + uint i; + int dummy; + switch (_chunk_type) { + case 0: + for (i = 0; i < 4; i++) { + if (!_channels[i].cmd_ptr) + continue; + if (!--_channels[i].notelen) { + dummy = READ_LE_UINT16(_channels[i].cmd_ptr); + if (dummy >= 0xfffe) { + if (dummy == 0xfffe) + _next_chunk = _current_data + 2; + parsePCjrChunk(); + return; + } + _channels[i].notelen = 4 * dummy; + dummy = READ_LE_UINT16(_channels[i].cmd_ptr + 2); + if (dummy == 0) { + _channels[i].hull_counter = 4; + _channels[i].sustctr = _channels[i].sustain_2; + } else { + _channels[i].hull_counter = 1; + _channels[i].freq = dummy; + } + debug(7, "chunk 0: channel %d play %d for %d", + i, dummy, _channels[i].notelen); + _channels[i].cmd_ptr += 4; + } + + + switch (_channels[i].hull_counter) { + case 1: + _channels[i].volume -= _channels[i].attack; + if ((int) _channels[i].volume <= 0) { + _channels[i].volume = 0; + _channels[i].hull_counter++; + } + break; + case 2: + _channels[i].volume += _channels[i].decay; + if (_channels[i].volume >= _channels[i].level) { + _channels[i].volume = _channels[i].level; + _channels[i].hull_counter++; + } + break; + case 4: + if (--_channels[i].sustctr < 0) { + _channels[i].sustctr = _channels[i].sustain_2; + _channels[i].volume += _channels[i].sustain_1; + if ((int) _channels[i].volume >= 15) { + _channels[i].volume = 15; + _channels[i].hull_counter++; + } + } + break; + } + } + break; + + case 1: + _start += _delta; + *_value_ptr = _start; + if (!--_time_left) { + _start = READ_LE_UINT16(_next_chunk); + _next_chunk += 2; + if (_start == 0xffff) { + parsePCjrChunk(); + return; + } + _delta = (int16) READ_LE_UINT16(_next_chunk); + _time_left = READ_LE_UINT16(_next_chunk + 2); + _next_chunk += 4; + *_value_ptr = _start; + } + + if (_channels[0].cmd_ptr) { + _start_2 += _delta_2; + *_value_ptr_2 = _start_2; + if (!--_time_left_2) { + _start_2 = READ_LE_UINT16(_channels[0].cmd_ptr); + if (_start_2 == 0xffff) { + _next_chunk = _channels[0].cmd_ptr + 2; + parsePCjrChunk(); + return; + } + _delta_2 = (int16) READ_LE_UINT16(_channels[0].cmd_ptr + 2); + _time_left_2 = READ_LE_UINT16(_channels[0].cmd_ptr + 4); + _channels[0].cmd_ptr += 6; + } + } + break; + + case 2: + _start += _delta; + if (_start == _end) { + parsePCjrChunk(); + return; + } + set_mplex(_start); + debug(7, "chunk 2: mplex %d curve %d", _start, _forced_level); + _forced_level = -_forced_level; + break; + case 3: + dummy = _channels[3].volume + _delta; + if (dummy >= 15) { + _channels[3].volume = 15; + } else if (dummy <= 0) { + _channels[3].volume = 0; + } else { + _channels[3].volume = dummy; + break; + } + + if (!--_repeat_ctr) { + 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 |