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207 lines
6.7 KiB
C
207 lines
6.7 KiB
C
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/*
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TiMidity -- Experimental MIDI to WAVE converter
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Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* This is for use with the SDL library */
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#define SDL
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#if (defined(WIN32) || defined(_WIN32)) && !defined(__WIN32__)
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#define __WIN32__
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#endif
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#define LITTLE_ENDIAN
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#include <stdint.h>
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/* When a patch file can't be opened, one of these extensions is
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appended to the filename and the open is tried again.
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*/
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#define PATCH_EXT_LIST { ".pat", 0 }
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/* Acoustic Grand Piano seems to be the usual default instrument. */
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#define DEFAULT_PROGRAM 0
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/* 9 here is MIDI channel 10, which is the standard percussion channel.
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Some files (notably C:\WINDOWS\CANYON.MID) think that 16 is one too.
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On the other hand, some files know that 16 is not a drum channel and
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try to play music on it. This is now a runtime option, so this isn't
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a critical choice anymore. */
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//#define DEFAULT_DRUMCHANNELS ((1<<9) | (1<<15))
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#define DEFAULT_DRUMCHANNELS ((1<<9))
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/* A somewhat arbitrary frequency range. The low end of this will
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sound terrible as no lowpass filtering is performed on most
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instruments before resampling. */
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#define MIN_OUTPUT_RATE 4000
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#define MAX_OUTPUT_RATE 65000
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/* In percent. */
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#define DEFAULT_AMPLIFICATION 70
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/* Default sampling rate, default polyphony, and maximum polyphony.
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All but the last can be overridden from the command line. */
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#define DEFAULT_RATE 32000
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#define DEFAULT_VOICES 32
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#define MAX_VOICES 48
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/* 1000 here will give a control ratio of 22:1 with 22 kHz output.
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Higher CONTROLS_PER_SECOND values allow more accurate rendering
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of envelopes and tremolo. The cost is CPU time. */
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#define CONTROLS_PER_SECOND 1000
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/* Strongly recommended. This option increases CPU usage by half, but
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without it sound quality is very poor. */
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#define LINEAR_INTERPOLATION
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/* This is an experimental kludge that needs to be done right, but if
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you've got an 8-bit sound card, or cheap multimedia speakers hooked
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to your 16-bit output device, you should definitely give it a try.
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Defining LOOKUP_HACK causes table lookups to be used in mixing
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instead of multiplication. We convert the sample data to 8 bits at
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load time and volumes to logarithmic 7-bit values before looking up
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the product, which degrades sound quality noticeably.
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Defining LOOKUP_HACK should save ~20% of CPU on an Intel machine.
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LOOKUP_INTERPOLATION might give another ~5% */
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/* #define LOOKUP_HACK
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#define LOOKUP_INTERPOLATION */
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/* Make envelopes twice as fast. Saves ~20% CPU time (notes decay
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faster) and sounds more like a GUS. There is now a command line
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option to toggle this as well. */
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#define FAST_DECAY
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/* How many bits to use for the fractional part of sample positions.
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This affects tonal accuracy. The entire position counter must fit
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in 32 bits, so with FRACTION_BITS equal to 12, the maximum size of
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a sample is 1048576 samples (2 megabytes in memory). The GUS gets
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by with just 9 bits and a little help from its friends...
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"The GUS does not SUCK!!!" -- a happy user :) */
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#define FRACTION_BITS 12
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/* For some reason the sample volume is always set to maximum in all
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patch files. Define this for a crude adjustment that may help
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equalize instrument volumes. */
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#define ADJUST_SAMPLE_VOLUMES
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/* The number of samples to use for ramping out a dying note. Affects
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click removal. */
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#define MAX_DIE_TIME 20
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/* On some machines (especially PCs without math coprocessors),
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looking up sine values in a table will be significantly faster than
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computing them on the fly. Uncomment this to use lookups. */
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/* #define LOOKUP_SINE */
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/* Shawn McHorse's resampling optimizations. These may not in fact be
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faster on your particular machine and compiler. You'll have to run
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a benchmark to find out. */
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#define PRECALC_LOOPS
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/* If calling ldexp() is faster than a floating point multiplication
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on your machine/compiler/libm, uncomment this. It doesn't make much
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difference either way, but hey -- it was on the TODO list, so it
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got done. */
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/* #define USE_LDEXP */
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/**************************************************************************/
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/* Anything below this shouldn't need to be changed unless you're porting
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to a new machine with other than 32-bit, big-endian words. */
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/**************************************************************************/
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/* change FRACTION_BITS above, not these */
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#define INTEGER_BITS (32 - FRACTION_BITS)
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#define INTEGER_MASK (0xFFFFFFFF << FRACTION_BITS)
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#define FRACTION_MASK (~ INTEGER_MASK)
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/* This is enforced by some computations that must fit in an int */
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#define MAX_CONTROL_RATIO 255
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/* Instrument files are little-endian, MIDI files big-endian, so we
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need to do some conversions. */
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#define XCHG_SHORT(x) ((((x)&0xFF)<<8) | (((x)>>8)&0xFF))
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# define XCHG_LONG(x) ((((x)&0xFF)<<24) | \
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(((x)&0xFF00)<<8) | \
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(((x)&0xFF0000)>>8) | \
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(((x)>>24)&0xFF))
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#ifdef LITTLE_ENDIAN
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#define LE_SHORT(x) x
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#define LE_LONG(x) x
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#define BE_SHORT(x) XCHG_SHORT(x)
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#define BE_LONG(x) XCHG_LONG(x)
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#else
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#define BE_SHORT(x) x
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#define BE_LONG(x) x
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#define LE_SHORT(x) XCHG_SHORT(x)
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#define LE_LONG(x) XCHG_LONG(x)
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#endif
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#define MAX_AMPLIFICATION 800
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/* These affect general volume */
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#define GUARD_BITS 3
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#define AMP_BITS (15-GUARD_BITS)
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#ifdef LOOKUP_HACK
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typedef int8_t sample_t;
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typedef uint8_t final_volume_t;
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# define FINAL_VOLUME(v) (~_l2u[v])
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# define MIXUP_SHIFT 5
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# define MAX_AMP_VALUE 4095
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#else
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typedef int16_t sample_t;
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typedef int32_t final_volume_t;
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# define FINAL_VOLUME(v) (v)
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# define MAX_AMP_VALUE ((1<<(AMP_BITS+1))-1)
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#endif
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#ifdef USE_LDEXP
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# define FSCALE(a,b) ldexp((a),(b))
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# define FSCALENEG(a,b) ldexp((a),-(b))
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#else
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# define FSCALE(a,b) (float)((a) * (double)(1<<(b)))
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# define FSCALENEG(a,b) (float)((a) * (1.0L / (double)(1<<(b))))
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#endif
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/* Vibrato and tremolo Choices of the Day */
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#define SWEEP_TUNING 38
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#define VIBRATO_AMPLITUDE_TUNING 1.0L
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#define VIBRATO_RATE_TUNING 38
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#define TREMOLO_AMPLITUDE_TUNING 1.0L
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#define TREMOLO_RATE_TUNING 38
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#define SWEEP_SHIFT 16
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#define RATE_SHIFT 5
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#define VIBRATO_SAMPLE_INCREMENTS 32
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#ifndef PI
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const float PI = 3.14159265358979323846f;
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#endif
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/* The path separator (D.M.) */
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//#ifdef __WIN32__
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# define PATH_SEP '\\'
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# define PATH_STRING "\\"
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//#else
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//# define PATH_SEP '/'
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//# define PATH_STRING "/"
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//#endif
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