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authorJohannes Schickel2010-10-13 03:57:44 +0000
committerJohannes Schickel2010-10-13 03:57:44 +0000
commit75e8452b6e6a2bf4fb2f588aa00b428a60d873b5 (patch)
treef29541d55309487a94bd1d38e8b53bb3dde9aec6 /engines/scumm/midiparser_eup.cpp
parent48ee83b88957dab86bc763e9ef21a70179fa8679 (diff)
parente9f50882ea5b6beeefa994040be9d3bab6a1f107 (diff)
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OPENGL: Merged from trunk, from rev 52105 to 53396.
This includes an rather hacky attempt to merge all the recent gp2x backend changes into the branch. I suppose the gp2x backend and probably all new backends, i.e. gph, dingux etc., might not compile anymore. Since I have no way of testing those it would be nice if porters could look into getting those up to speed in this branch. svn-id: r53399
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diff --git a/engines/scumm/midiparser_eup.cpp b/engines/scumm/midiparser_eup.cpp
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-/* 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.
- *
- * $URL$
- * $Id$
- *
- */
-
-
-#include "sound/midiparser.h"
-#include "sound/mididrv.h"
-#include "common/util.h"
-
-namespace Scumm {
-
-/**
- * The FM-TOWNS Euphony version of MidiParser.
- */
-class MidiParser_EUP : public MidiParser {
-protected:
- byte _instruments[6][50]; // Two extra bytes for SysEx ID and channel #
- byte *_instr_to_channel;
- struct {
- byte *enable;
- int8 *channel;
- int8 *volume;
- int8 *transpose;
- } _presets;
- bool _loop;
- byte _presend; // Tracks which startup implied events have been sent.
- uint32 _base_tick; // Events times are relative to this base.
-
-protected:
- void parseNextEvent (EventInfo &info);
- void resetTracking();
-
-public:
- bool loadMusic (byte *data, uint32 size);
-};
-
-
-
-//////////////////////////////////////////////////
-//
-// MidiParser_EUP implementation
-//
-//////////////////////////////////////////////////
-
-void MidiParser_EUP::parseNextEvent (EventInfo &info) {
- byte *pos = _position._play_pos;
-
- // FIXME: The presend is for sending init events
- // that aren't actually in the stream. This would
- // be for, e.g., instrument setup. Right now, we
- // don't actually use the instruments specified
- // in the music header. We're sending fixed GM
- // program changes to get a reasonable "one-size-
- // fits-all" sound until we actually support the
- // FM synthesis capabilities of FM-TOWNS.
- for (; _presend < 12; ++_presend) {
- if (_instr_to_channel[_presend >> 1] >= 16)
- continue;
- info.start = pos;
- info.delta = 0;
- if (_presend & 1) {
- byte *data = &_instruments[_presend >> 1][0];
- data[1] = _instr_to_channel[_presend >> 1];
- info.event = 0xF0;
- info.ext.data = data;
- info.length = 48;
- } else {
- info.event = 0xB0 | (_presend >> 1);
- info.basic.param1 = 121;
- info.basic.param2 = 0;
- }
- ++_presend;
- return;
- }
-
- while (true) {
- byte cmd = *pos;
- if ((cmd & 0xF0) == 0x90) {
- byte preset = pos[1];
- byte channel = _presets.channel[preset];
- if (channel >= 16)
- channel = cmd & 0x0F;
- uint16 tick = (pos[2] | ((uint16) pos[3] << 7)) + _base_tick;
- int note = (int) pos[4] + _presets.transpose[preset];
- int volume = (int) pos[5];
- // HACK: Loom-Towns distaff tracks seem to
- // contain zero-volume note events, so change
- // those to full volume.
- if (!volume)
- volume = 127;
- volume += _presets.volume[preset];
- if (volume > 127)
- volume = 127;
- else if (volume < 0)
- volume = 0;
- pos += 6;
- if (_presets.enable[preset]) {
- uint16 duration = pos[1] | (pos[2] << 4);
- info.start = pos;
- uint32 last = _position._last_event_tick;
- info.delta = (tick < last) ? 0 : (tick - last);
- info.event = 0x90 | channel;
- info.length = duration;
- info.basic.param1 = note;
- info.basic.param2 = volume;
- pos += 6;
- break;
- }
- pos += 6;
- } else if (cmd == 0xF2) {
- // This is a "measure marker" of sorts.
- // It advances the "base time", to which
- // all event times are relative.
- _base_tick += (pos[3] << 7) | pos[2];
- pos += 6;
- } else if (cmd == 0xF8) {
- // TODO: Implement this.
- pos += 6;
- } else if (cmd == 0xFD || cmd == 0xFE) {
- // End of track.
- if (_loop && false) {
- // TODO: Implement this.
- } else {
- info.start = pos;
- uint32 last = _position._last_event_tick;
- info.delta = (_base_tick < last) ? 0 : (_base_tick - last);
- info.event = 0xFF;
- info.length = 0;
- info.ext.type = 0x2F;
- info.ext.data = pos;
- break;
- }
- } else {
- error("Unknown Euphony music event 0x%02X", (int) cmd);
- memset(&info, 0, sizeof(info));
- pos = 0;
- break;
- }
- }
- _position._play_pos = pos;
-}
-
-bool MidiParser_EUP::loadMusic (byte *data, uint32 size) {
- unloadMusic();
- byte *pos = data;
- int i;
-
- if (memcmp(pos, "SO", 2)) {
- error("'SO' header expected but found '%c%c' instead.", pos[0], pos[1]);
- return false;
- }
-
- byte numInstruments = pos[16];
- pos += 16 + 2;
- for (i = 0; i < numInstruments; ++i) {
- _instruments[i][0] = 0x7C;
- memcpy (&_instruments[i][2], pos, 48);
- pos += 48;
- }
-
- // Load the prest pointers
- _presets.enable = pos;
- pos += 32;
- _presets.channel = (int8 *) pos;
- pos += 32;
- _presets.volume = (int8 *) pos;
- pos += 32;
- _presets.transpose = (int8 *) pos;
- pos += 32;
-
- pos += 8; // Unknown bytes
- _instr_to_channel = pos; // Instrument-to-channel mapping
- pos += 6;
- pos += 4; // Skip the music size for now.
- pos++; // Unknown byte
- byte tempo = *pos++;
- _loop = (*pos++ != 1);
- pos++; // Unknown byte
-
- _num_tracks = 1;
- _ppqn = 120;
- _tracks[0] = pos;
-
- // Note that we assume the original data passed in
- // will persist beyond this call, i.e. we do NOT
- // copy the data to our own buffer. Take warning....
- resetTracking();
- setTempo (1000000 * 60 / tempo);
- setTrack (0);
- return true;
-}
-
-void MidiParser_EUP::resetTracking() {
- MidiParser::resetTracking();
- _presend = 0;
- _base_tick = 0;
-}
-
-MidiParser *MidiParser_createEUP() { return new MidiParser_EUP; }
-
-} // End of namespace Scumm