Move MIDI sequencer into completely separated class

TODO:
- implement C bindings for most of class functions
- test it in work on any different synthesizer

1 files changed, 461 insertions, 0 deletions

diff --git a/src/cvt_mus2mid.hpp b/src/cvt_mus2mid.hpp
new file mode 100644
index 0000000..5a465c2
--- /dev/null
+++ b/src/cvt_mus2mid.hpp
@@ -0,0 +1,461 @@
+/*
+ * MUS2MIDI: MUS to MIDI Library
+ *
+ * Copyright (C) 2014  Bret Curtis
+ * Copyright (C) WildMIDI Developers  2015-2016
+ * ADLMIDI Library API: Copyright (c) 2015-2018 Vitaly Novichkov <admin@wohlnet.ru>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ */
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+
+#ifdef __DJGPP__
+typedef signed char     int8_t;
+typedef unsigned char   uint8_t;
+typedef signed short    int16_t;
+typedef unsigned short  uint16_t;
+typedef signed long     int32_t;
+typedef unsigned long   uint32_t;
+#endif
+
+#define MUS_FREQUENCY   140 /* default Hz or BPM */
+
+#if 0 /* older units: */
+#define MUS_TEMPO       0x001aa309 /* MPQN: 60000000 / 34.37Hz = 1745673 */
+#define MUS_DIVISION    0x0059 /* 89 -- used by many mus2midi converters */
+#endif
+
+#define MUS_TEMPO       0x00068A1B /* MPQN: 60000000 / 140BPM (140Hz) = 428571 */
+                /*  0x000D1436 -> MPQN: 60000000 /  70BPM  (70Hz) = 857142 */
+
+#define MUS_DIVISION    0x0101 /* 257 for 140Hz files with a 140MPQN */
+                /*  0x0088 -> 136 for  70Hz files with a 140MPQN */
+                /*  0x010B -> 267 for  70hz files with a 70MPQN  */
+                /*  0x01F9 -> 505 for 140hz files with a 70MPQN  */
+
+/* New
+ * QLS: MPQN/1000000 = 0.428571
+ * TDPS: QLS/PPQN = 0.428571/136 = 0.003151257
+ * PPQN: 136
+ *
+ * QLS: MPQN/1000000 = 0.428571
+ * TDPS: QLS/PPQN = 0.428571/257 = 0.001667591
+ * PPQN: 257
+ *
+ * QLS: MPQN/1000000 = 0.857142
+ * TDPS: QLS/PPQN = 0.857142/267 = 0.00321027
+ * PPQN: 267
+ *
+ * QLS: MPQN/1000000 = 0.857142
+ * TDPS: QLS/PPQN = 0.857142/505 = 0.001697311
+ * PPQN: 505
+ *
+ * Old
+ * QLS: MPQN/1000000 = 1.745673
+ * TDPS: QLS/PPQN = 1.745673 / 89 = 0.019614303 (seconds per tick)
+ * PPQN: (TDPS = QLS/PPQN) (0.019614303 = 1.745673/PPQN) (0.019614303*PPQN = 1.745673) (PPQN = 89.000001682)
+ *
+ */
+
+#define MUSEVENT_KEYOFF             0
+#define MUSEVENT_KEYON              1
+#define MUSEVENT_PITCHWHEEL         2
+#define MUSEVENT_CHANNELMODE        3
+#define MUSEVENT_CONTROLLERCHANGE   4
+#define MUSEVENT_END                6
+
+#define MUS_MIDI_MAXCHANNELS        16
+
+static char MUS_ID[] = { 'M', 'U', 'S', 0x1A };
+
+static uint8_t mus_midimap[] =
+{/* MIDI  Number  Description */
+    0,    /* 0    program change */
+    0,    /* 1    bank selection */
+    0x01, /* 2    Modulation pot (frequency vibrato depth) */
+    0x07, /* 3    Volume: 0-silent, ~100-normal, 127-loud */
+    0x0A, /* 4    Pan (balance) pot: 0-left, 64-center (default), 127-right */
+    0x0B, /* 5    Expression pot */
+    0x5B, /* 6    Reverb depth */
+    0x5D, /* 7    Chorus depth */
+    0x40, /* 8    Sustain pedal */
+    0x43, /* 9    Soft pedal */
+    0x78, /* 10   All sounds off */
+    0x7B, /* 11   All notes off */
+    0x7E, /* 12   Mono (use numchannels + 1) */
+    0x7F, /* 13   Poly */
+    0x79, /* 14   reset all controllers */
+};
+
+typedef struct MUSHeader {
+    char ID[4];             /* identifier: "MUS" 0x1A */
+    uint16_t scoreLen;
+    uint16_t scoreStart;
+    uint16_t channels;      /* count of primary channels */
+    uint16_t sec_channels;  /* count of secondary channels */
+    uint16_t instrCnt;
+} MUSHeader ;
+#define MUS_HEADERSIZE 14
+
+typedef struct MidiHeaderChunk {
+    char name[4];
+    int32_t length;
+    int16_t format; /* make 0 */
+    int16_t ntracks;/* make 1 */
+    int16_t division; /* 0xe250 ?? */
+} MidiHeaderChunk;
+#define MIDI_HEADERSIZE 14
+
+typedef struct MidiTrackChunk {
+    char name[4];
+    int32_t length;
+} MidiTrackChunk;
+#define TRK_CHUNKSIZE 8
+
+struct mus_ctx {
+    uint8_t *src, *src_ptr;
+    uint32_t srcsize;
+    uint32_t datastart;
+    uint8_t *dst, *dst_ptr;
+    uint32_t dstsize, dstrem;
+};
+
+#define DST_CHUNK 8192
+static void mus2mid_resize_dst(struct mus_ctx *ctx) {
+    uint32_t pos = (uint32_t)(ctx->dst_ptr - ctx->dst);
+    ctx->dst = (uint8_t *)realloc(ctx->dst, ctx->dstsize + DST_CHUNK);
+    ctx->dstsize += DST_CHUNK;
+    ctx->dstrem += DST_CHUNK;
+    ctx->dst_ptr = ctx->dst + pos;
+}
+
+static void mus2mid_write1(struct mus_ctx *ctx, uint32_t val)
+{
+    if (ctx->dstrem < 1)
+        mus2mid_resize_dst(ctx);
+    *ctx->dst_ptr++ = val & 0xff;
+    ctx->dstrem--;
+}
+
+static void mus2mid_write2(struct mus_ctx *ctx, uint32_t val)
+{
+    if (ctx->dstrem < 2)
+        mus2mid_resize_dst(ctx);
+    *ctx->dst_ptr++ = (val>>8) & 0xff;
+    *ctx->dst_ptr++ = val & 0xff;
+    ctx->dstrem -= 2;
+}
+
+static void mus2mid_write4(struct mus_ctx *ctx, uint32_t val)
+{
+    if (ctx->dstrem < 4)
+        mus2mid_resize_dst(ctx);
+    *ctx->dst_ptr++ = (val>>24)&0xff;
+    *ctx->dst_ptr++ = (val>>16)&0xff;
+    *ctx->dst_ptr++ = (val>>8) & 0xff;
+    *ctx->dst_ptr++ = val & 0xff;
+    ctx->dstrem -= 4;
+}
+
+static void mus2mid_seekdst(struct mus_ctx *ctx, uint32_t pos) {
+    ctx->dst_ptr = ctx->dst + pos;
+    while (ctx->dstsize < pos)
+        mus2mid_resize_dst(ctx);
+    ctx->dstrem = ctx->dstsize - pos;
+}
+
+static void mus2mid_skipdst(struct mus_ctx *ctx, int32_t pos) {
+    size_t newpos;
+    ctx->dst_ptr += pos;
+    newpos = ctx->dst_ptr - ctx->dst;
+    while (ctx->dstsize < newpos)
+        mus2mid_resize_dst(ctx);
+    ctx->dstrem = (uint32_t)(ctx->dstsize - newpos);
+}
+
+static uint32_t mus2mid_getdstpos(struct mus_ctx *ctx) {
+    return (uint32_t)(ctx->dst_ptr - ctx->dst);
+}
+
+/* writes a variable length integer to a buffer, and returns bytes written */
+static int32_t mus2mid_writevarlen(int32_t value, uint8_t *out)
+{
+    int32_t buffer, count = 0;
+
+    buffer = value & 0x7f;
+    while ((value >>= 7) > 0) {
+        buffer <<= 8;
+        buffer += 0x80;
+        buffer += (value & 0x7f);
+    }
+
+    while (1) {
+        ++count;
+        *out = (uint8_t)buffer;
+        ++out;
+        if (buffer & 0x80)
+            buffer >>= 8;
+        else
+            break;
+    }
+    return (count);
+}
+
+#define MUS_READ_INT16(b) ((b)[0] | ((b)[1] << 8))
+#define MUS_READ_INT32(b) ((b)[0] | ((b)[1] << 8) | ((b)[2] << 16) | ((b)[3] << 24))
+
+static int Convert_mus2midi(uint8_t *in, uint32_t insize,
+                            uint8_t **out, uint32_t *outsize,
+                            uint16_t frequency)
+{
+    struct mus_ctx ctx;
+    MUSHeader header;
+    uint8_t *cur, *end;
+    uint32_t track_size_pos, begin_track_pos, current_pos;
+    int32_t delta_time;/* Delta time for midi event */
+    int temp, ret = -1;
+    int channel_volume[MUS_MIDI_MAXCHANNELS];
+    int channelMap[MUS_MIDI_MAXCHANNELS], currentChannel;
+
+    if (insize < MUS_HEADERSIZE) {
+        /*_WM_GLOBAL_ERROR(__FUNCTION__, __LINE__, WM_ERR_CORUPT, "(too short)", 0);*/
+        return (-1);
+    }
+
+    if (!frequency)
+        frequency = MUS_FREQUENCY;
+
+    /* read the MUS header and set our location */
+    memcpy(header.ID, in, 4);
+    header.scoreLen = MUS_READ_INT16(&in[4]);
+    header.scoreStart = MUS_READ_INT16(&in[6]);
+    header.channels = MUS_READ_INT16(&in[8]);
+    header.sec_channels = MUS_READ_INT16(&in[10]);
+    header.instrCnt = MUS_READ_INT16(&in[12]);
+
+    if (memcmp(header.ID, MUS_ID, 4)) {
+        /*_WM_GLOBAL_ERROR(__FUNCTION__, __LINE__, WM_ERR_NOT_MUS, NULL, 0);*/
+        return (-1);
+    }
+    if (insize < (uint32_t)header.scoreLen + (uint32_t)header.scoreStart) {
+        /*_WM_GLOBAL_ERROR(__FUNCTION__, __LINE__, WM_ERR_CORUPT, "(too short)", 0);*/
+        return (-1);
+    }
+    /* channel #15 should be excluded in the numchannels field: */
+    if (header.channels > MUS_MIDI_MAXCHANNELS - 1) {
+        /*_WM_GLOBAL_ERROR(__FUNCTION__, __LINE__, WM_ERR_INVALID, NULL, 0);*/
+        return (-1);
+    }
+
+    memset(&ctx, 0, sizeof(struct mus_ctx));
+    ctx.src = ctx.src_ptr = in;
+    ctx.srcsize = insize;
+
+    ctx.dst = (uint8_t*)calloc(DST_CHUNK, sizeof(uint8_t));
+    ctx.dst_ptr = ctx.dst;
+    ctx.dstsize = DST_CHUNK;
+    ctx.dstrem = DST_CHUNK;
+
+    /* Map channel 15 to 9 (percussions) */
+    for (temp = 0; temp < MUS_MIDI_MAXCHANNELS; ++temp) {
+        channelMap[temp] = -1;
+        channel_volume[temp] = 0x40;
+    }
+    channelMap[15] = 9;
+
+    /* Header is 14 bytes long and add the rest as well */
+    mus2mid_write1(&ctx, 'M');
+    mus2mid_write1(&ctx, 'T');
+    mus2mid_write1(&ctx, 'h');
+    mus2mid_write1(&ctx, 'd');
+    mus2mid_write4(&ctx, 6);    /* length of header */
+    mus2mid_write2(&ctx, 0);    /* MIDI type (always 0) */
+    mus2mid_write2(&ctx, 1);    /* MUS files only have 1 track */
+    mus2mid_write2(&ctx, MUS_DIVISION); /* division */
+
+    /* Write out track header and track length position for later */
+    begin_track_pos = mus2mid_getdstpos(&ctx);
+    mus2mid_write1(&ctx, 'M');
+    mus2mid_write1(&ctx, 'T');
+    mus2mid_write1(&ctx, 'r');
+    mus2mid_write1(&ctx, 'k');
+    track_size_pos = mus2mid_getdstpos(&ctx);
+    mus2mid_skipdst(&ctx, 4);
+
+    /* write tempo: microseconds per quarter note */
+    mus2mid_write1(&ctx, 0x00); /* delta time */
+    mus2mid_write1(&ctx, 0xff); /* sys command */
+    mus2mid_write2(&ctx, 0x5103);   /* command - set tempo */
+    mus2mid_write1(&ctx, MUS_TEMPO & 0x000000ff);
+    mus2mid_write1(&ctx, (MUS_TEMPO & 0x0000ff00) >> 8);
+    mus2mid_write1(&ctx, (MUS_TEMPO & 0x00ff0000) >> 16);
+
+    /* Percussions channel starts out at full volume */
+    mus2mid_write1(&ctx, 0x00);
+    mus2mid_write1(&ctx, 0xB9);
+    mus2mid_write1(&ctx, 0x07);
+    mus2mid_write1(&ctx, 127);
+
+    /* get current position in source, and end of position */
+    cur = in + header.scoreStart;
+    end = cur + header.scoreLen;
+
+    currentChannel = 0;
+    delta_time = 0;
+
+    /* main loop */
+    while(cur < end){
+        /*printf("LOOP DEBUG: %d\r\n",iterator++);*/
+        uint8_t channel;
+        uint8_t event;
+        uint8_t temp_buffer[32];    /* temp buffer for current iterator */
+        uint8_t *out_local = temp_buffer;
+        uint8_t status, bit1, bit2, bitc = 2;
+
+        /* read in current bit */
+        event = *cur++;
+        channel = (event & 15);     /* current channel */
+
+        /* write variable length delta time */
+        out_local += mus2mid_writevarlen(delta_time, out_local);
+
+        /* set all channels to 127 (max) volume */
+        if (channelMap[channel] < 0) {
+            *out_local++ = 0xB0 + currentChannel;
+            *out_local++ = 0x07;
+            *out_local++ = 127;
+            *out_local++ = 0x00;
+            channelMap[channel] = currentChannel++;
+            if (currentChannel == 9)
+                ++currentChannel;
+        }
+        status = channelMap[channel];
+
+        /* handle events */
+        switch ((event & 122) >> 4){
+            case MUSEVENT_KEYOFF:
+                status |=  0x80;
+                bit1 = *cur++;
+                bit2 = 0x40;
+                break;
+            case MUSEVENT_KEYON:
+                status |= 0x90;
+                bit1 = *cur & 127;
+                if (*cur++ & 128)   /* volume bit? */
+                    channel_volume[channelMap[channel]] = *cur++;
+                bit2 = channel_volume[channelMap[channel]];
+                break;
+            case MUSEVENT_PITCHWHEEL:
+                status |= 0xE0;
+                bit1 = (*cur & 1) >> 6;
+                bit2 = (*cur++ >> 1) & 127;
+                break;
+            case MUSEVENT_CHANNELMODE:
+                status |= 0xB0;
+                if (*cur >= sizeof(mus_midimap) / sizeof(mus_midimap[0])) {
+                    /*_WM_ERROR_NEW("%s:%i: can't map %u to midi",
+                                  __FUNCTION__, __LINE__, *cur);*/
+                    goto _end;
+                }
+                bit1 = mus_midimap[*cur++];
+                bit2 = (*cur++ == 12) ? header.channels + 1 : 0x00;
+                break;
+            case MUSEVENT_CONTROLLERCHANGE:
+                if (*cur == 0) {
+                    cur++;
+                    status |= 0xC0;
+                    bit1 = *cur++;
+                    bit2 = 0;/* silence bogus warnings */
+                    bitc = 1;
+                } else {
+                    status |= 0xB0;
+                    if (*cur >= sizeof(mus_midimap) / sizeof(mus_midimap[0])) {
+                        /*_WM_ERROR_NEW("%s:%i: can't map %u to midi",
+                                      __FUNCTION__, __LINE__, *cur);*/
+                        goto _end;
+                    }
+                    bit1 = mus_midimap[*cur++];
+                    bit2 = *cur++;
+                }
+                break;
+            case MUSEVENT_END:  /* End */
+                status = 0xff;
+                bit1 = 0x2f;
+                bit2 = 0x00;
+                if (cur != end) { /* should we error here or report-only? */
+                    /*_WM_DEBUG_MSG("%s:%i: MUS buffer off by %ld bytes",
+                                  __FUNCTION__, __LINE__, (long)(cur - end));*/
+                }
+                break;
+            case 5:/* Unknown */
+            case 7:/* Unknown */
+            default:/* shouldn't happen */
+                /*_WM_ERROR_NEW("%s:%i: unrecognized event (%u)",
+                              __FUNCTION__, __LINE__, event);*/
+                goto _end;
+        }
+
+        /* write it out */
+        *out_local++ = status;
+        *out_local++ = bit1;
+        if (bitc == 2)
+            *out_local++ = bit2;
+
+        /* write out our temp buffer */
+        if (out_local != temp_buffer)
+        {
+            if (ctx.dstrem < sizeof(temp_buffer))
+                mus2mid_resize_dst(&ctx);
+
+            memcpy(ctx.dst_ptr, temp_buffer, out_local - temp_buffer);
+            ctx.dst_ptr += out_local - temp_buffer;
+            ctx.dstrem -= (uint32_t)(out_local - temp_buffer);
+        }
+
+        if (event & 128) {
+            delta_time = 0;
+            do {
+                delta_time = (int32_t)((delta_time * 128 + (*cur & 127)) * (140.0 / (double)frequency));
+            } while ((*cur++ & 128));
+        } else {
+            delta_time = 0;
+        }
+    }
+
+    /* write out track length */
+    current_pos = mus2mid_getdstpos(&ctx);
+    mus2mid_seekdst(&ctx, track_size_pos);
+    mus2mid_write4(&ctx, current_pos - begin_track_pos - TRK_CHUNKSIZE);
+    mus2mid_seekdst(&ctx, current_pos); /* reseek to end position */
+
+    *out = ctx.dst;
+    *outsize = ctx.dstsize - ctx.dstrem;
+    ret = 0;
+
+_end:   /* cleanup */
+    if (ret < 0) {
+        free(ctx.dst);
+        *out = NULL;
+        *outsize = 0;
+    }
+
+    return (ret);
+}
+