forked from sin365/AxibugEmuOnline
309 lines
11 KiB
C#
309 lines
11 KiB
C#
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using System;
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using System.IO;
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namespace MAME.Core
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{
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public class OKI6295
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{
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public struct adpcm_state
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{
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public int signal;
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public int step;
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};
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public struct ADPCMVoice
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{
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public bool playing;
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public uint base_offset;
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public uint sample;
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public uint count;
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public uint volume;
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};
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public struct okim6295Struct
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{
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public ADPCMVoice[] voice;
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public int command;
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public int bank_offset;
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public uint master_clock;
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};
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public static byte[] okirom;
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public static okim6295Struct OKI;
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public static adpcm_state[] adpcm;
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private static int[] index_shift = new int[8] { -1, -1, -1, -1, 2, 4, 6, 8 };
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private static int[] diff_lookup = new int[49 * 16];
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private static uint[] volume_table = new uint[16];
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private static int tables_computed = 0;
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private static void compute_tables()
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{
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int[,] nbl2bit = new int[16, 4]
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{
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{ 1, 0, 0, 0}, { 1, 0, 0, 1}, { 1, 0, 1, 0}, { 1, 0, 1, 1},
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{ 1, 1, 0, 0}, { 1, 1, 0, 1}, { 1, 1, 1, 0}, { 1, 1, 1, 1},
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{-1, 0, 0, 0}, {-1, 0, 0, 1}, {-1, 0, 1, 0}, {-1, 0, 1, 1},
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{-1, 1, 0, 0}, {-1, 1, 0, 1}, {-1, 1, 1, 0}, {-1, 1, 1, 1}
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};
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int step, nib;
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for (step = 0; step <= 48; step++)
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{
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int stepval = (int)Math.Floor(16.0 * Math.Pow(11.0 / 10.0, (double)step));
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for (nib = 0; nib < 16; nib++)
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{
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diff_lookup[step * 16 + nib] = nbl2bit[nib, 0] *
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(stepval * nbl2bit[nib, 1] +
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stepval / 2 * nbl2bit[nib, 2] +
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stepval / 4 * nbl2bit[nib, 3] +
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stepval / 8);
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}
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}
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for (step = 0; step < 16; step++)
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{
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double dout = 256.0;
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int vol = step;
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while (vol-- > 0)
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dout /= 1.412537545;
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volume_table[step] = (uint)dout;
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}
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tables_computed = 1;
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}
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private static void reset_adpcm(int i)
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{
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if (tables_computed == 0)
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{
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compute_tables();
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}
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adpcm[i].signal = -2;
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adpcm[i].step = 0;
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}
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private static short clock_adpcm(int i, byte nibble)
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{
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adpcm[i].signal += diff_lookup[adpcm[i].step * 16 + (nibble & 15)];
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if (adpcm[i].signal > 2047)
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adpcm[i].signal = 2047;
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else if (adpcm[i].signal < -2048)
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adpcm[i].signal = -2048;
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adpcm[i].step += index_shift[nibble & 7];
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if (adpcm[i].step > 48)
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adpcm[i].step = 48;
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else if (adpcm[i].step < 0)
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adpcm[i].step = 0;
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return (short)(adpcm[i].signal << 4);
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}
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private static void generate_adpcm(int i, short[] buffer, int samples)
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{
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int i1 = 0;
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if (OKI.voice[i].playing)
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{
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int bbase = (int)(OKI.bank_offset + OKI.voice[i].base_offset);
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int sample = (int)OKI.voice[i].sample;
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int count = (int)OKI.voice[i].count;
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while (samples != 0)
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{
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int nibble = okirom[bbase + sample / 2] >> (((sample & 1) << 2) ^ 4);
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buffer[i1] = (short)(clock_adpcm(i, (byte)nibble) * OKI.voice[i].volume / 256);
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i1++;
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samples--;
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if (++sample >= count)
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{
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OKI.voice[i].playing = false;
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break;
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}
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}
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OKI.voice[i].sample = (uint)sample;
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}
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while ((samples--) != 0)
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{
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buffer[i1] = 0;
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i1++;
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}
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}
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//TODO 移动到这里，但是大小，还需要考虑
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static short[] sample_data = new short[10000];
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public unsafe static void okim6295_update(int offset, int length)
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{
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int i;
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for (i = 0; i < length; i++)
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{
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Sound.okistream.streamoutput_Ptrs[0][offset + i] = 0;
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}
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for (i = 0; i < 4; i++)
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{
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//不每次new，避免GC，排除问题。待验证影响
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//short[] sample_data = new short[10000];
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int remaining = length;
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while (remaining != 0)
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{
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int samples1 = (remaining > 10000) ? 10000 : remaining;
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int samp;
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generate_adpcm(i, sample_data, samples1);
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for (samp = 0; samp < length; samp++)
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{
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Sound.okistream.streamoutput_Ptrs[0][offset + samp] += sample_data[samp];
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}
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remaining -= samples1;
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}
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}
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}
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public static void okim6295_start()
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{
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int voice;
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compute_tables();
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OKI.command = -1;
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OKI.bank_offset = 0;
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OKI.master_clock = 1000000;
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OKI.voice = new ADPCMVoice[4];
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adpcm = new adpcm_state[4];
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for (voice = 0; voice < 4; voice++)
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{
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OKI.voice[voice].volume = 255;
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reset_adpcm(voice);
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}
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}
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public static void okim6295_reset()
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{
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int i;
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Sound.okistream.stream_update();
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for (i = 0; i < 4; i++)
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{
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OKI.voice[i].playing = false;
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}
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}
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public static void okim6295_set_bank_base(int base1)
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{
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Sound.okistream.stream_update();
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OKI.bank_offset = base1;
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}
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public static void okim6295_set_pin7(int pin7)
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{
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int divisor = pin7 != 0 ? 132 : 165;
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//stream_set_sample_rate(info->stream, info->master_clock / divisor);
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}
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public static int okim6295_status_r()
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{
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int i, result;
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result = 0xf0;
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Sound.okistream.stream_update();
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for (i = 0; i < 4; i++)
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{
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ADPCMVoice voice = OKI.voice[i];
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if (voice.playing)
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result |= 1 << i;
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}
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return result;
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}
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private static void okim6295_data_w(int num, int data)
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{
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if (OKI.command != -1)
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{
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int temp = data >> 4, i, start, stop;
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int baseoffset;
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Sound.okistream.stream_update();
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for (i = 0; i < 4; i++, temp >>= 1)
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{
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if ((temp & 1) != 0)
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{
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baseoffset = OKI.bank_offset + OKI.command * 8;
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start = ((okirom[baseoffset + 0] << 16) + (okirom[baseoffset + 1] << 8) + okirom[baseoffset + 2]) & 0x3ffff;
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stop = ((okirom[baseoffset + 3] << 16) + (okirom[baseoffset + 4] << 8) + okirom[baseoffset + 5]) & 0x3ffff;
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if (start < stop)
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{
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if (!OKI.voice[i].playing)
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{
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OKI.voice[i].playing = true;
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OKI.voice[i].base_offset = (uint)start;
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OKI.voice[i].sample = 0;
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OKI.voice[i].count = (uint)(2 * (stop - start + 1));
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reset_adpcm(i);
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OKI.voice[i].volume = volume_table[data & 0x0f];
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}
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else
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{
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}
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}
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else
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{
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OKI.voice[i].playing = false;
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}
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}
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}
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OKI.command = -1;
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}
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else if ((data & 0x80) != 0)
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{
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OKI.command = data & 0x7f;
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}
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else
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{
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int temp = data >> 3, i;
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Sound.okistream.stream_update();
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for (i = 0; i < 4; i++, temp >>= 1)
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{
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if ((temp & 1) != 0)
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{
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OKI.voice[i].playing = false;
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}
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}
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}
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}
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public static byte okim6295_status_0_r()
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{
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int i;
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byte result;
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result = 0xf0;
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Sound.okistream.stream_update();
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for (i = 0; i < 4; i++)
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{
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if (OKI.voice[i].playing)
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{
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result |= (byte)(1 << i);
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}
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}
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return result;
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}
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public static int okim6295_status_0_lsb_r()
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{
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return okim6295_status_r();
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}
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public static void okim6295_data_0_w(byte data)
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{
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okim6295_data_w(0, data);
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}
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public static void okim6295_data_0_lsb_w(byte data)
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{
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//if (ACCESSING_BITS_0_7)
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okim6295_data_w(0, data & 0xff);
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}
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public static void SaveStateBinary(BinaryWriter writer)
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{
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int i;
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writer.Write(OKI.command);
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writer.Write(OKI.bank_offset);
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for (i = 0; i < 4; i++)
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{
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writer.Write(OKI.voice[i].playing);
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writer.Write(OKI.voice[i].sample);
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writer.Write(OKI.voice[i].count);
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writer.Write(OKI.voice[i].volume);
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writer.Write(OKI.voice[i].base_offset);
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writer.Write(adpcm[i].signal);
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writer.Write(adpcm[i].step);
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}
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}
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public static void LoadStateBinary(BinaryReader reader)
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{
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int i;
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OKI.command = reader.ReadInt32();
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OKI.bank_offset = reader.ReadInt32();
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for (i = 0; i < 4; i++)
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{
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OKI.voice[i].playing = reader.ReadBoolean();
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OKI.voice[i].sample = reader.ReadUInt32();
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OKI.voice[i].count = reader.ReadUInt32();
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OKI.voice[i].volume = reader.ReadUInt32();
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OKI.voice[i].base_offset = reader.ReadUInt32();
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adpcm[i].signal = reader.ReadInt32();
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adpcm[i].step = reader.ReadInt32();
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}
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}
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}
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}
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