using System; using System.IO; using System.Linq; using System.Text; using BizHawk.Emulation.Common; using BizHawk.Emulation.Cores.Nintendo.SNES; namespace BizHawk.Client.Common.movie.import { // ReSharper disable once UnusedMember.Global // http://tasvideos.org/EmulatorResources/Snes9x/SMV.html [ImporterFor("Snes9x", ".smv")] internal class SmvImport : MovieImporter { private LibsnesControllerDeck _deck; protected override void RunImport() { var bsnesName = ((CoreAttribute)Attribute.GetCustomAttribute(typeof(LibsnesCore), typeof(CoreAttribute))).CoreName; Result.Movie.HeaderEntries[HeaderKeys.CORE] = bsnesName; using var fs = SourceFile.Open(FileMode.Open, FileAccess.Read); using var r = new BinaryReader(fs); // 000 4-byte signature: 53 4D 56 1A "SMV\x1A" string signature = new string(r.ReadChars(4)); if (signature != "SMV\x1A") { Result.Errors.Add("This is not a valid .SMV file."); return; } Result.Movie.HeaderEntries[HeaderKeys.PLATFORM] = "SNES"; // 004 4-byte little-endian unsigned int: version number uint versionNumber = r.ReadUInt32(); string version; switch (versionNumber) { case 1: version = "1.43"; break; case 4: version = "1.51"; break; case 5: version = "1.52"; break; default: version = "Unknown"; break; } Result.Movie.Comments.Add($"{EmulationOrigin} Snes9x version {version}"); Result.Movie.Comments.Add($"{MovieOrigin} .SMV"); /* 008 4-byte little-endian integer: movie "uid" - identifies the movie-savestate relationship, also used as the recording time in Unix epoch format */ uint uid = r.ReadUInt32(); // 00C 4-byte little-endian unsigned int: rerecord count Result.Movie.Rerecords = r.ReadUInt32(); // 010 4-byte little-endian unsigned int: number of frames uint frameCount = r.ReadUInt32(); // 014 1-byte flags "controller mask" byte controllerFlags = r.ReadByte(); /* * bit 0: controller 1 in use * bit 1: controller 2 in use * bit 2: controller 3 in use * bit 3: controller 4 in use * bit 4: controller 5 in use * other: reserved, set to 0 */ bool[] controllersUsed = new bool[5]; // Eww, this is a clunky way to do this for (int controller = 1; controller <= controllersUsed.Length; controller++) { controllersUsed[controller - 1] = ((controllerFlags >> (controller - 1)) & 0x1) != 0; } var controllerCount = controllersUsed.Count(c => c); var ss = new LibsnesCore.SnesSyncSettings { LeftPort = LibsnesControllerDeck.ControllerType.Gamepad, RightPort = LibsnesControllerDeck.ControllerType.Gamepad }; if (controllerCount == 1) { ss.RightPort = LibsnesControllerDeck.ControllerType.Unplugged; } else if (controllerCount > 2) { // More than 2 controllers means a multi-tap on the first port // Snes9x only supported up to 5 controllers, so right port would never be multitap ss.LeftPort = LibsnesControllerDeck.ControllerType.Multitap; // Unless there are exactly 5, right port is unplugged, as the multitap will handle 4 controllers if (controllerCount < 5) { ss.RightPort = LibsnesControllerDeck.ControllerType.Unplugged; } } _deck = new LibsnesControllerDeck(ss); // 015 1-byte flags "movie options" byte movieFlags = r.ReadByte(); /* bit 0: if "0", movie begins from an embedded "quicksave" snapshot if "1", a SRAM is included instead of a quicksave; movie begins from reset */ if ((movieFlags & 0x1) == 0) { Result.Errors.Add("Movies that begin with a savestate are not supported."); return; } // bit 1: if "0", movie is NTSC (60 fps); if "1", movie is PAL (50 fps) bool pal = ((movieFlags >> 1) & 0x1) != 0; Result.Movie.HeaderEntries[HeaderKeys.PAL] = pal.ToString(); // other: reserved, set to 0 /* 016 1-byte flags "sync options": bit 0: MOVIE_SYNC2_INIT_FASTROM other: reserved, set to 0 */ r.ReadByte(); /* 017 1-byte flags "sync options": bit 0: MOVIE_SYNC_DATA_EXISTS if "1", all sync options flags are defined. if "0", all sync options flags have no meaning. bit 1: MOVIE_SYNC_WIP1TIMING bit 2: MOVIE_SYNC_LEFTRIGHT bit 3: MOVIE_SYNC_VOLUMEENVX bit 4: MOVIE_SYNC_FAKEMUTE bit 5: MOVIE_SYNC_SYNCSOUND bit 6: MOVIE_SYNC_HASROMINFO if "1", there is extra ROM info located right in between of the metadata and the savestate. bit 7: set to 0. */ byte syncFlags = r.ReadByte(); /* Extra ROM info is always positioned right before the savestate. Its size is 30 bytes if MOVIE_SYNC_HASROMINFO is used (and MOVIE_SYNC_DATA_EXISTS is set), 0 bytes otherwise. */ int extraRomInfo = (((syncFlags >> 6) & 0x1) != 0 && (syncFlags & 0x1) != 0) ? 30 : 0; // 018 4-byte little-endian unsigned int: offset to the savestate inside file uint savestateOffset = r.ReadUInt32(); // 01C 4-byte little-endian unsigned int: offset to the controller data inside file uint firstFrameOffset = r.ReadUInt32(); int[] controllerTypes = new int[2]; // The (.SMV 1.51 and up) header has an additional 32 bytes at the end if (version != "1.43") { // 020 4-byte little-endian unsigned int: number of input samples, primarily for peripheral-using games r.ReadBytes(4); /* 024 2 1-byte unsigned ints: what type of controller is plugged into ports 1 and 2 respectively: 0=NONE, 1=JOYPAD, 2=MOUSE, 3=SUPERSCOPE, 4=JUSTIFIER, 5=MULTITAP */ controllerTypes[0] = r.ReadByte(); controllerTypes[1] = r.ReadByte(); // 026 4 1-byte signed ints: controller IDs of port 1, or -1 for unplugged r.ReadBytes(4); // 02A 4 1-byte signed ints: controller IDs of port 2, or -1 for unplugged r.ReadBytes(4); // 02E 18 bytes: reserved for future use r.ReadBytes(18); } /* After the header comes "metadata", which is UTF16-coded movie title string (author info). The metadata begins from position 32 (0x20 (0x40 for 1.51 and up)) and ends at . */ byte[] metadata = r.ReadBytes((int)(savestateOffset - extraRomInfo - ((version != "1.43") ? 0x40 : 0x20))); string author = NullTerminated(Encoding.Unicode.GetString(metadata).Trim()); if (!string.IsNullOrWhiteSpace(author)) { Result.Movie.HeaderEntries[HeaderKeys.AUTHOR] = author; } if (extraRomInfo == 30) { // 000 3 bytes of zero padding: 00 00 00 003 4-byte integer: CRC32 of the ROM 007 23-byte ascii string r.ReadBytes(3); int crc32 = r.ReadInt32(); Result.Movie.HeaderEntries["CRC32"] = crc32.ToString(); // the game name copied from the ROM, truncated to 23 bytes (the game name in the ROM is 21 bytes) string gameName = NullTerminated(Encoding.UTF8.GetString(r.ReadBytes(23))); Result.Movie.HeaderEntries[HeaderKeys.GAMENAME] = gameName; } SimpleController controllers = new SimpleController { Definition = _deck.Definition }; r.BaseStream.Position = firstFrameOffset; /* 01 00 (reserved) 02 00 (reserved) 04 00 (reserved) 08 00 (reserved) 10 00 R 20 00 L 40 00 X 80 00 A 00 01 Right 00 02 Left 00 04 Down 00 08 Up 00 10 Start 00 20 Select 00 40 Y 00 80 B */ string[] buttons = { "Right", "Left", "Down", "Up", "Start", "Select", "Y", "B", "R", "L", "X", "A" }; for (int frame = 0; frame <= frameCount; frame++) { controllers["Reset"] = true; for (int player = 1; player <= controllersUsed.Length; player++) { if (!controllersUsed[player - 1]) { continue; } /* Each frame consists of 2 bytes per controller. So if there are 3 controllers, a frame is 6 bytes and if there is only 1 controller, a frame is 2 bytes. */ byte controllerState1 = r.ReadByte(); byte controllerState2 = r.ReadByte(); /* In the reset-recording patch, a frame that contains the value FF FF for every controller denotes a reset. The reset is done through the S9xSoftReset routine. */ if (controllerState1 != 0xFF || controllerState2 != 0xFF) { controllers["Reset"] = false; } /* While the meaning of controller data (for 1.51 and up) for a single standard SNES controller pad remains the same, each frame of controller data can contain additional bytes if input for peripherals is being recorded. */ if (version != "1.43" && player <= controllerTypes.Length) { var peripheral = ""; switch (controllerTypes[player - 1]) { case 0: // NONE continue; case 1: // JOYPAD break; case 2: // MOUSE peripheral = "Mouse"; // 5*num_mouse_ports r.ReadBytes(5); break; case 3: // SUPERSCOPE peripheral = "Super Scope"; // 6*num_superscope_ports r.ReadBytes(6); break; case 4: // JUSTIFIER peripheral = "Justifier"; // 11*num_justifier_ports r.ReadBytes(11); break; case 5: // MULTITAP peripheral = "Multitap"; break; } if (peripheral != "" && !Result.Warnings.Any()) { Result.Warnings.Add($"Unable to import {peripheral}. Not supported yet"); } } ushort controllerState = (ushort)(((controllerState1 << 4) & 0x0F00) | controllerState2); for (int button = 0; button < buttons.Length; button++) { controllers[$"P{player} {buttons[button]}"] = ((controllerState >> button) & 0x1) != 0; } } // The controller data contains frames. if (frame == 0) { continue; } Result.Movie.AppendFrame(controllers); Result.Movie.SyncSettingsJson = ConfigService.SaveWithType(ss); Global.Config.SnesInSnes9x = false; } } } }