rockbox/apps/plugins/midi/midiutil.h

/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2005 Stepan Moskovchenko
 *
 * 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 2
 * of the License, or (at your option) any later version.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

#define FRACTSIZE 12

#include "lib/pluginlib_exit.h"

#define BUF_SIZE 16384 /* 64 kB output buffers */
#define NBUF   2
#define MAX_SAMPLES 512

#ifdef SIMULATOR

/* Simulator requires 44100Hz, and we can afford to use more voices */
#define SAMPLE_RATE SAMPR_44
#define MAX_VOICES 48

#elif (CONFIG_PLATFORM & PLATFORM_HOSTED)

/* All hosted targets have CPU to spare */
#define MAX_VOICES 48
#define SAMPLE_RATE SAMPR_44

#elif defined(CPU_PP)

/* Some of the pp based targets can't handle too many voices
   mainly because they have to use 44100Hz sample rate, this could be
   improved to increase MAX_VOICES for targets that can do 22kHz */
#define SAMPLE_RATE HW_SAMPR_MIN_GE_22
#if HW_SAMPR_CAPS & SAMPR_CAP_22
#define MAX_VOICES 24 /* General MIDI minimum */
#else
#define MAX_VOICES 16
#endif

#elif defined(CPU_MIPS)

/* All MIPS targets are pretty fast */
#define MAX_VOICES 48
#define SAMPLE_RATE SAMPR_44

#elif defined(CPU_ARM)

/* ARMv4 targets are slow, but treat everything else as fast */

#if (ARM_ARCH >= 6)
#define MAX_VOICES 32
#define SAMPLE_RATE SAMPR_44
#elif (ARM_ARCH >= 5)
#define MAX_VOICES 32
#define SAMPLE_RATE HW_SAMPR_MIN_GE_22
#else /* ie v4 */
#define SAMPLE_RATE HW_SAMPR_MIN_GE_22
#if HW_SAMPR_CAPS & SAMPR_CAP_22
#define MAX_VOICES 24 /* General MIDI minimum */
#else
#define MAX_VOICES 16
#endif
#endif /* ARM_ARCH < 5*/

#else /* !CPU_ARM */

/* Treat everything else as slow */
#define SAMPLE_RATE HW_SAMPR_MIN_GE_22
#if HW_SAMPR_CAPS & SAMPR_CAP_22
#define MAX_VOICES 24 /* General MIDI minimum */
#else
#define MAX_VOICES 16
#endif

#endif /* Wrap it up. */

#define BYTE unsigned char

/* Data chunk ID types, returned by readID() */
#define ID_UNKNOWN  -1
#define ID_MTHD     1
#define ID_MTRK     2
#define ID_EOF      3
#define ID_RIFF     4

/* MIDI Commands */
#define MIDI_NOTE_OFF   128
#define MIDI_NOTE_ON    144
#define MIDI_AFTERTOUCH 160
#define MIDI_CONTROL    176
#define MIDI_PRGM   192
#define MIDI_PITCHW 224

/* MIDI Controllers */
#define CTRL_DATAENT_MSB    6
#define CTRL_VOLUME     7
#define CTRL_BALANCE    8
#define CTRL_PANNING    10
#define CTRL_NONREG_LSB 98
#define CTRL_NONREG_MSB 99
#define CTRL_REG_LSB    100
#define CTRL_REG_MSB    101

#define REG_PITCHBEND_MSB 0
#define REG_PITCHBEND_LSB 0


#define CHANNEL     1

/* Most of these are deprecated.. rampdown is used, maybe one other one too */
#define STATE_ATTACK        1
#define STATE_DECAY         2
#define STATE_SUSTAIN       3
#define STATE_RELEASE       4
#define STATE_RAMPDOWN      5

/* Loop states */
#define STATE_LOOPING           7
#define STATE_NONLOOPING    8

/* Various bits in the GUS mode byte */
#define LOOP_ENABLED    4
#define LOOP_PINGPONG   8
#define LOOP_REVERSE    16

struct MIDIfile
{
    int  Length;
    unsigned short numTracks;
    unsigned short div; /* Time division, X ticks per millisecond */
    struct Track * tracks[48];
    unsigned char patches[128];
    int numPatches;
};

struct SynthObject
{
    struct GWaveform * wf;
    int delta;
    int decay;
    unsigned int cp; /* unsigned int */
    int state, loopState;
    int note, vol, ch;
    int curRate, curOffset, targetOffset;
    int curPoint;
    signed short int volscale;
    bool isUsed;
};

struct Event
{
    unsigned int delta;
    unsigned char status, d1, d2;
    unsigned int len;
    unsigned char * evData;
};

struct Track
{
    unsigned int size;
    unsigned int numEvents;
    unsigned int delta; /* For sequencing */
    unsigned int pos;   /* For sequencing */
    void * dataBlock;
};

int midi_debug(const char *fmt, ...);
unsigned char readChar(int file);
int readTwoBytes(int file);
int readFourBytes(int file);
int readVarData(int file);
int eof(int fd);
void * readData(int file, int len);

#define malloc(n) my_malloc(n)
void * my_malloc(int size);

extern struct SynthObject voices[MAX_VOICES];

extern int chVol[16];       /* Channel volume                */
extern int chPan[16];       /* Channel panning               */
extern int chPat[16];       /* Channel patch                 */
extern int chPW[16];        /* Channel pitch wheel, MSB only */
extern int chPBDepth[16];   /* Channel pitch bend depth (Controller 6 */
extern int chPBNoteOffset[16] IBSS_ATTR;       /* Pre-computed whole semitone offset */
extern int chPBFractBend[16] IBSS_ATTR;        /* Fractional bend applied to delta */
extern unsigned char chLastCtrlMSB[16]; /* MIDI regs, used for Controller 6. */
extern unsigned char chLastCtrlLSB[16]; /* The non-registered ones are ignored */

extern struct GPatch * gusload(char *);
extern struct GPatch * patchSet[128];
extern struct GPatch * drumSet[128];

extern struct MIDIfile * mf;

extern int number_of_samples;
extern int playing_time IBSS_ATTR;
extern int samples_this_second IBSS_ATTR;
extern long bpm;