126 lines
5.3 KiB
C#
126 lines
5.3 KiB
C#
using System;
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using System.Collections.Generic;
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namespace BizHawk.Client.Common
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{
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public class PlatformFrameRates
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{
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// these are political numbers, designed to be in accord with tasvideos.org tradition. they're not necessarily mathematical factualities (although they may be in some cases)
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// it would be nice if we could turn this into a rational expression natively, and also, to write some comments about the derivation and ideal values (since this seems to be where they're all collected)
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// are we collecting them anywhere else? for avi-writing code perhaps?
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// just some constants, according to specs
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private static readonly double PALCarrier = (15625 * 283.75) + 25; // 4.43361875 MHz
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private static readonly double NTSCCarrier = 4500000 * 227.5 / 286; // 3.579545454... MHz
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private static readonly double PALNCarrier = (15625 * 229.25) + 25; // 3.58205625 MHz
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private static readonly Dictionary<string, double> Rates = new Dictionary<string, double>
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{
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["NES"] = 60.098813897440515532, // discussion here: http://forums.nesdev.com/viewtopic.php?t=492 ; a rational expression would be (19687500 / 11) / ((341*262-0.529780.5)/3) -> (118125000 / 1965513) -> 60.098813897440515529533511098629 (so our chosen number is very close)
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["NES_PAL"] = 50.006977968268290849,
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["FDS"] = 60.098813897440515532,
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["FDS_PAL"] = 50.006977968268290849,
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["SNES"] = 21477272.0 / (4 * 341 * 262), // 60.098475521
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["SNES_PAL"] = 21281370.0 / (4 * 341 * 312), // 50.0069789082
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["SGB"] = 21477272.0 / (4 * 341 * 262), // 60.098475521
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["SGB_PAL"] = 21281370.0 / (4 * 341 * 312), // 50.0069789082
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["PCE"] = (7159090.90909090 / 455 / 263), // 59.8261054535
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["PCECD"] = (7159090.90909090 / 455 / 263), // 59.8261054535
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["SMS"] = (3579545 / 262.0 / 228.0), // 59.9227434043
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["SMS_PAL"] = (3546893 / 313.0 / 228.0), // 49.7014320946
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["GG"] = (3579545 / 262.0 / 228.0), // 59.9227434043
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["GG_PAL"] = (3546893 / 313.0 / 228.0), // 49.7014320946
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["SG"] = (3579545 / 262.0 / 228.0), // 59.9227434043
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["SG_PAL"] = (3546893 / 313.0 / 228.0), // 49.7014320946
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["NGP"] = (6144000.0 / (515 * 198)), // 60.2530155928
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["VB"] = (20000000.0 / (259 * 384 * 4)), // 50.2734877735
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["Lynx"] = 16000000.0 / (16 * 105 * 159), // 59.89817310572028
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["WSWAN"] = (3072000.0 / (159 * 256)), // 75.4716981132
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["GB"] = 262144.0 / 4389.0, // 59.7275005696
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["GBC"] = 262144.0 / 4389.0, // 59.7275005696
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["GB_Clock"] = 2097152.0,
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["GBA"] = 262144.0 / 4389.0, // 59.7275005696
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["GEN"] = 53693175 / (3420.0 * 262),
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["GEN_PAL"] = 53203424 / (3420.0 * 313),
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// while the number of scanlines per frame is software controlled and variable, we
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// enforce exactly 262 (NTSC) 312 (PAL) per reference time frame
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["A26"] = 315000000.0 / 88.0 / 262.0 / 228.0, // 59.922751013550531429197560173856
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// this pal clock ref is exact
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["A26_PAL"] = 3546895.0 / 312.0 / 228.0, // 49.860759671614934772829509671615
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["A78"] = 59.9227510135505,
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["Coleco"] = 59.9227510135505,
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// according to http://problemkaputt.de/psx-spx.htm
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["PSX"] = 44100.0 * 768 * 11 / 7 / 263 / 3413, // 59.292862562
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["PSX_PAL"] = 44100.0 * 768 * 11 / 7 / 314 / 3406, // 49.7645593576
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["C64_PAL"] = PALCarrier * 2 / 9 / 312 / 63,
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["C64_NTSC"] = NTSCCarrier * 2 / 7 / 263 / 65,
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["C64_NTSC_OLD"] = NTSCCarrier * 2 / 7 / 262 / 64,
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["C64_DREAN"] = PALNCarrier * 2 / 7 / 312 / 65,
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["INTV"] = 59.92,
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["ZXSpectrum_PAL"] = 50.080128205,
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["AmstradCPC_PAL"] = 50.08012820512821,
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// according to ryphecha, using
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// clocks[2] = { 53.693182e06, 53.203425e06 }; //ntsc console, pal console
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// lpf[2][2] = { { 263, 262.5 }, { 314, 312.5 } }; //ntsc,pal; non-interlaced, interlaced
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// cpl[2] = { 3412.5, 3405 }; //ntsc mode, pal mode
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// PAL PS1: 0, PAL Mode: 0, Interlaced: 0 --- 59.826106 (53.693182e06/(263*3412.5))
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// PAL PS1: 0, PAL Mode: 0, Interlaced: 1 --- 59.940060 (53.693182e06/(262.5*3412.5))
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// PAL PS1: 1, PAL Mode: 1, Interlaced: 0 --- 49.761427 (53.203425e06/(314*3405))
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// PAL PS1: 1, PAL Mode: 1, Interlaced: 1 --- 50.000282(53.203425e06/(312.5*3405))
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};
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public double this[string systemId, bool pal]
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{
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get
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{
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var key = systemId + (pal ? "_PAL" : "");
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return Rates.ContainsKey(key) ? Rates[key] : 60.0;
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}
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}
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public TimeSpan MovieTime(IMovie movie)
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{
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var dblSeconds = GetSeconds(movie);
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var seconds = (int)(dblSeconds % 60);
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var days = seconds / 86400;
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var hours = seconds / 3600;
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var minutes = (seconds / 60) % 60;
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var milliseconds = (int)((dblSeconds - seconds) * 1000);
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return new TimeSpan(days, hours, minutes, seconds, milliseconds);
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}
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private double Fps(IMovie movie)
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{
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var system = movie.HeaderEntries[HeaderKeys.Platform];
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var core = movie.HeaderEntries[HeaderKeys.Core];
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var pal = movie.HeaderEntries.ContainsKey(HeaderKeys.Pal)
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&& movie.HeaderEntries[HeaderKeys.Pal] == "1";
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if (movie.HeaderEntries.ContainsKey(HeaderKeys.CycleCount) && core == "Gambatte")
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{
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system = "GB_Clock";
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}
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return this[system, pal];
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}
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private double GetSeconds(IMovie movie)
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{
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double frames = movie.TimeLength;
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if (frames < 1)
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{
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return 0;
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}
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return frames / Fps(movie);
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}
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}
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}
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