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97
...ayer/src/main/java/net/emustudio/plugins/device/cassette_player/PlaybackListenerImpl.java
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...e-player/src/main/java/net/emustudio/plugins/device/cassette_player/TapePlaybackImpl.java
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| /* | ||
| * This file is part of emuStudio. | ||
| * | ||
| * Copyright (C) 2006-2023 Peter Jakubčo | ||
| * | ||
| * 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 <https://www.gnu.org/licenses/>. | ||
| */ | ||
| package net.emustudio.plugins.device.cassette_player; | ||
|
|
||
| import net.emustudio.emulib.plugins.cpu.TimedEventsProcessor; | ||
| import net.emustudio.emulib.plugins.device.DeviceContext; | ||
| import net.emustudio.plugins.device.cassette_player.gui.CassettePlayerGui; | ||
| import net.emustudio.plugins.device.cassette_player.loaders.Loader; | ||
|
|
||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.Objects; | ||
| import java.util.Optional; | ||
| import java.util.concurrent.atomic.AtomicReference; | ||
| import java.util.function.Supplier; | ||
|
|
||
| /** | ||
| * Tape playback. | ||
| * <p> | ||
| * ZX-Spectrum 48K pulses (for TAP file): | ||
| * For each block: | ||
| * - on header block: 8063 pulses of 2168 t-states | ||
| * - on data block: 3223 pulses of 2168 t-states | ||
| * - sync1 (667 t-states) | ||
| * - sync2 (735 t-states) | ||
| * - block data: 2 pulses of 855 t-states (zero) or 1710 t-states (one) for each byte | ||
| * (this is: flag (1 byte), data (xx - flag - checksum), checksum (1 byte) | ||
| * <p> | ||
| * Links: | ||
| * - <a href="https://worldofspectrum.org/faq/reference/48kreference.htm">ZX-Spectrum 48K Technical Reference</a> | ||
| * - <a href="https://softspectrum48.weebly.com/notes/tape-loading-routines">Tape loading routines</a> | ||
| * - <a href="https://sinclair.wiki.zxnet.co.uk/wiki/Spectrum_tape_interface">Spectrum tape interface</a> | ||
| */ | ||
| public class TapePlaybackImpl implements Loader.TapePlayback { | ||
| private final static int LEADER_PULSE_TSTATES = 2168; | ||
| private final static int SYNC1_PULSE_TSTATES = 667; | ||
| private final static int SYNC2_PULSE_TSTATES = 735; | ||
| private final static int SYNC3_PULSE_TSTATES = 954; | ||
| private final static int PAUSE_PULSE_TSTATES = 7000000; | ||
| private final static int HEADER_LEADER_PULSE_COUNT = 8063; | ||
| private final static int DATA_LEADER_PULSE_COUNT = 3223; | ||
| private final static int DATA_PULSE_ONE_TSTATES = 1710; | ||
| private final static int DATA_PULSE_ZERO_TSTATES = 855; | ||
|
|
||
| private final DeviceContext<Byte> lineIn; | ||
| private final AtomicReference<CassettePlayerGui> gui = new AtomicReference<>(); | ||
| private final Supplier<TimedEventsProcessor> tepSupplier; | ||
| private TimedEventsProcessor tep = null; | ||
|
|
||
| private final Map<Integer, Runnable> loaderSchedule = new HashMap<>(); | ||
| private int currentTstates; | ||
| private boolean pulseUp; | ||
|
|
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| public TapePlaybackImpl(DeviceContext<Byte> lineIn, Supplier<TimedEventsProcessor> tepSupplier) { | ||
| this.lineIn = Objects.requireNonNull(lineIn); | ||
| this.tepSupplier = Objects.requireNonNull(tepSupplier); | ||
| } | ||
|
|
||
| public void setGui(CassettePlayerGui gui) { | ||
| this.gui.set(gui); | ||
| } | ||
|
|
||
| @Override | ||
| public void onFileStart() { | ||
| loaderSchedule.clear(); | ||
| currentTstates = 1; | ||
| pulseUp = true; | ||
| } | ||
|
|
||
| @Override | ||
| public void onHeaderStart() { | ||
| for (int i = 0; i < HEADER_LEADER_PULSE_COUNT; i++) { | ||
| schedulePulse(LEADER_PULSE_TSTATES); | ||
| } | ||
| schedulePulse(SYNC1_PULSE_TSTATES); | ||
| schedulePulse(SYNC2_PULSE_TSTATES); | ||
| } | ||
|
|
||
| @Override | ||
| public void onDataStart() { | ||
| for (int i = 0; i < DATA_LEADER_PULSE_COUNT; i++) { | ||
| schedulePulse(LEADER_PULSE_TSTATES); | ||
| } | ||
| schedulePulse(SYNC1_PULSE_TSTATES); | ||
| schedulePulse(SYNC2_PULSE_TSTATES); | ||
| } | ||
|
|
||
| @Override | ||
| public void onBlockFlag(int flag) { | ||
| transmitByte(flag); | ||
| } | ||
|
|
||
| @Override | ||
| public void onProgram(String filename, int dataLength, int autoStart, int programLength) { | ||
| log(filename + " : PROGRAM (start=" + autoStart + ", length=" + programLength + ")"); | ||
| } | ||
|
|
||
| @Override | ||
| public void onNumberArray(String filename, int dataLength, char variable) { | ||
| log(filename + " : NUMBER ARRAY (variable=" + variable + ")"); | ||
| } | ||
|
|
||
| @Override | ||
| public void onStringArray(String filename, int dataLength, char variable) { | ||
| log(filename + " : STRING ARRAY (variable=" + variable + ")"); | ||
| } | ||
|
|
||
| @Override | ||
| public void onMemoryBlock(String filename, int dataLength, int startAddress) { | ||
| log(filename + " : MEMORY BLOCK (start=" + startAddress + ")"); | ||
| } | ||
|
|
||
| @Override | ||
| public void onBlockData(byte[] data) { | ||
| for (byte d : data) { | ||
| transmitByte(d & 0xFF); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public void onBlockChecksum(byte checksum) { | ||
| transmitByte(checksum & 0xFF); | ||
| // schedulePulse(SYNC3_PULSE_TSTATES); | ||
| // pulseUp = false; | ||
| // schedulePulse(PAUSE_PULSE_TSTATES); | ||
| } | ||
|
|
||
| @Override | ||
| public void onFileEnd() { | ||
| playPulses(); | ||
| } | ||
|
|
||
| @Override | ||
| public void onStateChange(CassetteController.CassetteState state) { | ||
| Optional.ofNullable(gui.get()).ifPresent(g -> g.setCassetteState(state)); | ||
| } | ||
|
|
||
| private void log(String message) { | ||
| Optional.ofNullable(gui.get()).ifPresent(g -> g.setMetadata(message)); | ||
| } | ||
|
|
||
| private void transmitByte(int data) { | ||
| int mask = 0x80; // 1000 0000 | ||
| while (mask != 0) { | ||
| int pulseLength = ((data & mask) == 0) ? DATA_PULSE_ZERO_TSTATES : DATA_PULSE_ONE_TSTATES; | ||
| schedulePulse(pulseLength); // 2x according to https://sinclair.wiki.zxnet.co.uk/wiki/Spectrum_tape_interface | ||
| schedulePulse(pulseLength); | ||
| mask >>>= 1; | ||
| } | ||
| } | ||
|
|
||
| private void schedulePulse(int length) { | ||
| Runnable one = () -> lineIn.writeData((byte) 1); | ||
| Runnable zero = () -> lineIn.writeData((byte) 0); | ||
|
|
||
| loaderSchedule.put(currentTstates, pulseUp ? one : zero); | ||
| currentTstates += length; | ||
| pulseUp = !pulseUp; | ||
| } | ||
|
|
||
| private void playPulses() { | ||
| if (tep == null) { | ||
| tep = tepSupplier.get(); | ||
| } | ||
| tep.scheduleOnceMultiple(loaderSchedule); | ||
| } | ||
| } |
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