mirror of
https://github.com/Rockbox/rockbox.git
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155 lines
4.3 KiB
C
155 lines
4.3 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2005 Stepan Moskovchenko
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#define FRACTSIZE 12
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#include "lib/pluginlib_exit.h"
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#define BUF_SIZE 16384 /* 64 kB output buffers */
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#define NBUF 2
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#define MAX_SAMPLES 512
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#define BYTE unsigned char
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/* Data chunk ID types, returned by readID() */
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#define ID_UNKNOWN -1
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#define ID_MTHD 1
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#define ID_MTRK 2
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#define ID_EOF 3
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#define ID_RIFF 4
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/* MIDI Commands */
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#define MIDI_NOTE_OFF 128
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#define MIDI_NOTE_ON 144
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#define MIDI_AFTERTOUCH 160
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#define MIDI_CONTROL 176
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#define MIDI_PRGM 192
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#define MIDI_PITCHW 224
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/* MIDI Controllers */
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#define CTRL_DATAENT_MSB 6
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#define CTRL_VOLUME 7
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#define CTRL_BALANCE 8
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#define CTRL_PANNING 10
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#define CTRL_NONREG_LSB 98
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#define CTRL_NONREG_MSB 99
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#define CTRL_REG_LSB 100
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#define CTRL_REG_MSB 101
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#define REG_PITCHBEND_MSB 0
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#define REG_PITCHBEND_LSB 0
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#define CHANNEL 1
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/* Most of these are deprecated.. rampdown is used, maybe one other one too */
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#define STATE_ATTACK 1
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#define STATE_DECAY 2
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#define STATE_SUSTAIN 3
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#define STATE_RELEASE 4
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#define STATE_RAMPDOWN 5
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/* Loop states */
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#define STATE_LOOPING 7
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#define STATE_NONLOOPING 8
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/* Various bits in the GUS mode byte */
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#define LOOP_ENABLED 4
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#define LOOP_PINGPONG 8
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#define LOOP_REVERSE 16
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struct MIDIfile
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{
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int Length;
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unsigned short numTracks;
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unsigned short div; /* Time division, X ticks per millisecond */
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struct Track * tracks[48];
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unsigned char patches[128];
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int numPatches;
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};
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struct SynthObject
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{
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struct GWaveform * wf;
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int delta;
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int decay;
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unsigned int cp; /* unsigned int */
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int state, loopState;
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int note, vol, ch;
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int curRate, curOffset, targetOffset;
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int curPoint;
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signed short int volscale;
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bool isUsed;
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};
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struct Event
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{
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unsigned int delta;
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unsigned char status, d1, d2;
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unsigned int len;
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unsigned char * evData;
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};
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struct Track
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{
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unsigned int size;
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unsigned int numEvents;
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unsigned int delta; /* For sequencing */
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unsigned int pos; /* For sequencing */
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void * dataBlock;
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};
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int midi_debug(const char *fmt, ...);
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unsigned char readChar(int file);
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int readTwoBytes(int file);
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int readFourBytes(int file);
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int readVarData(int file);
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int eof(int fd);
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void * readData(int file, int len);
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#define malloc(n) my_malloc(n)
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void * my_malloc(int size);
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extern struct SynthObject voices[48]; /* 48: maximum possible max_voices */
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extern int chVol[16]; /* Channel volume */
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extern int chPan[16]; /* Channel panning */
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extern int chPat[16]; /* Channel patch */
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extern int chPW[16]; /* Channel pitch wheel, MSB only */
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extern int chPBDepth[16]; /* Channel pitch bend depth (Controller 6 */
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extern int chPBNoteOffset[16] IBSS_ATTR; /* Pre-computed whole semitone offset */
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extern int chPBFractBend[16] IBSS_ATTR; /* Fractional bend applied to delta */
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extern unsigned char chLastCtrlMSB[16]; /* MIDI regs, used for Controller 6. */
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extern unsigned char chLastCtrlLSB[16]; /* The non-registered ones are ignored */
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extern struct GPatch * gusload(char *);
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extern struct GPatch * patchSet[128];
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extern struct GPatch * drumSet[128];
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extern struct MIDIfile * mf;
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extern int sample_rate;
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extern int max_voices;
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extern int number_of_samples;
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extern int playing_time IBSS_ATTR;
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extern int samples_this_second IBSS_ATTR;
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extern long bpm;
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