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sdlgenaudiocvt.pl
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sdlgenaudiocvt.pl
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#!/usr/bin/perl -w
use warnings;
use strict;
my @audiotypes = qw(
U8
S8
U16LSB
S16LSB
U16MSB
S16MSB
S32LSB
S32MSB
F32LSB
F32MSB
);
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my @channels = ( 1, 2, 4, 6, 8 );
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my %funcs;
my $custom_converters = 0;
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sub getTypeConvertHashId {
my ($from, $to) = @_;
return "TYPECONVERTER $from/$to";
}
sub getResamplerHashId {
my ($from, $channels, $upsample, $multiple) = @_;
return "RESAMPLER $from/$channels/$upsample/$multiple";
}
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sub outputHeader {
print <<EOF;
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/* DO NOT EDIT! This file is generated by sdlgenaudiocvt.pl */
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2010 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser 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
Sam Lantinga
slouken\@libsdl.org
*/
#include "SDL_config.h"
#include "SDL_audio.h"
#include "SDL_audio_c.h"
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#ifndef DEBUG_CONVERT
#define DEBUG_CONVERT 0
#endif
/* If you can guarantee your data and need space, you can eliminate code... */
/* Just build the arbitrary resamplers if you're saving code space. */
#ifndef LESS_RESAMPLERS
#define LESS_RESAMPLERS 0
#endif
/* Don't build any resamplers if you're REALLY saving code space. */
#ifndef NO_RESAMPLERS
#define NO_RESAMPLERS 0
#endif
/* Don't build any type converters if you're saving code space. */
#ifndef NO_CONVERTERS
#define NO_CONVERTERS 0
#endif
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/* *INDENT-OFF* */
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EOF
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my @vals = ( 127, 32767, 2147483647 );
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foreach (@vals) {
my $val = $_;
my $fval = 1.0 / $val;
print("#define DIVBY${val} ${fval}f\n");
}
print("\n");
}
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sub outputFooter {
print <<EOF;
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/* $custom_converters converters generated. */
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/* *INDENT-ON* */
/* vi: set ts=4 sw=4 expandtab: */
EOF
}
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sub splittype {
my $t = shift;
my ($signed, $size, $endian) = $t =~ /([USF])(\d+)([LM]SB|)/;
my $float = ($signed eq 'F') ? 1 : 0;
$signed = (($float) or ($signed eq 'S')) ? 1 : 0;
$endian = 'NONE' if ($endian eq '');
my $ctype = '';
if ($float) {
$ctype = (($size == 32) ? 'float' : 'double');
} else {
$ctype = (($signed) ? 'S' : 'U') . "int${size}";
}
return ($signed, $float, $size, $endian, $ctype);
}
sub getSwapFunc {
my ($size, $signed, $float, $endian, $val) = @_;
my $BEorLE = (($endian eq 'MSB') ? 'BE' : 'LE');
my $code = '';
if ($float) {
$code = "SDL_SwapFloat${BEorLE}($val)";
} else {
if ($size > 8) {
$code = "SDL_Swap${BEorLE}${size}($val)";
} else {
$code = $val;
}
if (($signed) and (!$float)) {
$code = "((Sint${size}) $code)";
}
}
return "${code}";
}
sub maxIntVal {
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my $size = shift;
if ($size == 8) {
return 0x7F;
} elsif ($size == 16) {
return 0x7FFF;
} elsif ($size == 32) {
return 0x7FFFFFFF;
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}
die("bug in script.\n");
}
sub getFloatToIntMult {
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my $size = shift;
my $val = maxIntVal($size) . '.0';
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$val .= 'f' if ($size < 32);
return $val;
}
sub getIntToFloatDivBy {
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my $size = shift;
return 'DIVBY' . maxIntVal($size);
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}
sub getSignFlipVal {
my $size = shift;
if ($size == 8) {
return '0x80';
} elsif ($size == 16) {
return '0x8000';
} elsif ($size == 32) {
return '0x80000000';
}
die("bug in script.\n");
}
sub buildCvtFunc {
my ($from, $to) = @_;
my ($fsigned, $ffloat, $fsize, $fendian, $fctype) = splittype($from);
my ($tsigned, $tfloat, $tsize, $tendian, $tctype) = splittype($to);
my $diffs = 0;
$diffs++ if ($fsize != $tsize);
$diffs++ if ($fsigned != $tsigned);
$diffs++ if ($ffloat != $tfloat);
$diffs++ if ($fendian ne $tendian);
return if ($diffs == 0);
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my $hashid = getTypeConvertHashId($from, $to);
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if (1) { # !!! FIXME: if ($diffs > 1) {
my $sym = "SDL_Convert_${from}_to_${to}";
$funcs{$hashid} = $sym;
$custom_converters++;
# Always unsigned for ints, for possible byteswaps.
my $srctype = (($ffloat) ? 'float' : "Uint${fsize}");
print <<EOF;
static void SDLCALL
${sym}(SDL_AudioCVT * cvt, SDL_AudioFormat format)
{
int i;
const $srctype *src;
$tctype *dst;
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#if DEBUG_CONVERT
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fprintf(stderr, "Converting AUDIO_${from} to AUDIO_${to}.\\n");
#endif
EOF
if ($fsize < $tsize) {
my $mult = $tsize / $fsize;
print <<EOF;
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src = ((const $srctype *) (cvt->buf + cvt->len_cvt)) - 1;
dst = (($tctype *) (cvt->buf + cvt->len_cvt * $mult)) - 1;
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for (i = cvt->len_cvt / sizeof ($srctype); i; --i, --src, --dst) {
EOF
} else {
print <<EOF;
src = (const $srctype *) cvt->buf;
dst = ($tctype *) cvt->buf;
for (i = cvt->len_cvt / sizeof ($srctype); i; --i, ++src, ++dst) {
EOF
}
# Have to convert to/from float/int.
# !!! FIXME: cast through double for int32<->float?
my $code = getSwapFunc($fsize, $fsigned, $ffloat, $fendian, '*src');
if ($ffloat != $tfloat) {
if ($ffloat) {
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my $mult = getFloatToIntMult($tsize);
if (!$tsigned) { # bump from -1.0f/1.0f to 0.0f/2.0f
$code = "($code + 1.0f)";
}
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$code = "(($tctype) ($code * $mult))";
} else {
# $divby will be the reciprocal, to avoid pipeline stalls
# from floating point division...so multiply it.
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my $divby = getIntToFloatDivBy($fsize);
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$code = "(((float) $code) * $divby)";
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if (!$fsigned) { # bump from 0.0f/2.0f to -1.0f/1.0f.
$code = "($code - 1.0f)";
}
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}
} else {
# All integer conversions here.
if ($fsigned != $tsigned) {
my $signflipval = getSignFlipVal($fsize);
$code = "(($code) ^ $signflipval)";
}
my $shiftval = abs($fsize - $tsize);
if ($fsize < $tsize) {
$code = "((($tctype) $code) << $shiftval)";
} elsif ($fsize > $tsize) {
$code = "(($tctype) ($code >> $shiftval))";
}
}
my $swap = getSwapFunc($tsize, $tsigned, $tfloat, $tendian, 'val');
print <<EOF;
const $tctype val = $code;
*dst = ${swap};
}
EOF
if ($fsize > $tsize) {
my $divby = $fsize / $tsize;
print(" cvt->len_cvt /= $divby;\n");
} elsif ($fsize < $tsize) {
my $mult = $tsize / $fsize;
print(" cvt->len_cvt *= $mult;\n");
}
print <<EOF;
if (cvt->filters[++cvt->filter_index]) {
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cvt->filters[cvt->filter_index] (cvt, AUDIO_$to);
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}
}
EOF
} else {
if ($fsigned != $tsigned) {
$funcs{$hashid} = 'SDL_ConvertSigned';
} elsif ($ffloat != $tfloat) {
$funcs{$hashid} = 'SDL_ConvertFloat';
} elsif ($fsize != $tsize) {
$funcs{$hashid} = 'SDL_ConvertSize';
} elsif ($fendian ne $tendian) {
$funcs{$hashid} = 'SDL_ConvertEndian';
} else {
die("error in script.\n");
}
}
}
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sub buildTypeConverters {
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print "#if !NO_CONVERTERS\n\n";
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foreach (@audiotypes) {
my $from = $_;
foreach (@audiotypes) {
my $to = $_;
buildCvtFunc($from, $to);
}
}
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print "#endif /* !NO_CONVERTERS */\n\n\n";
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print "const SDL_AudioTypeFilters sdl_audio_type_filters[] =\n{\n";
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print "#if !NO_CONVERTERS\n";
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foreach (@audiotypes) {
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my $from = $_;
foreach (@audiotypes) {
my $to = $_;
if ($from ne $to) {
my $hashid = getTypeConvertHashId($from, $to);
my $sym = $funcs{$hashid};
print(" { AUDIO_$from, AUDIO_$to, $sym },\n");
}
}
}
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print "#endif /* !NO_CONVERTERS */\n";
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print(" { 0, 0, NULL }\n");
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print "};\n\n\n";
}
sub getBiggerCtype {
my ($isfloat, $size) = @_;
if ($isfloat) {
if ($size == 32) {
return 'double';
}
die("bug in script.\n");
}
if ($size == 8) {
return 'Sint16';
} elsif ($size == 16) {
return 'Sint32'
} elsif ($size == 32) {
return 'Sint64'
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}
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die("bug in script.\n");
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}
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# These handle arbitrary resamples...44100Hz to 48000Hz, for example.
# Man, this code is skanky.
sub buildArbitraryResampleFunc {
# !!! FIXME: we do a lot of unnecessary and ugly casting in here, due to getSwapFunc().
my ($from, $channels, $upsample) = @_;
my ($fsigned, $ffloat, $fsize, $fendian, $fctype) = splittype($from);
my $bigger = getBiggerCtype($ffloat, $fsize);
my $interp = ($ffloat) ? '* 0.5' : '>> 1';
my $resample = ($upsample) ? 'Upsample' : 'Downsample';
my $hashid = getResamplerHashId($from, $channels, $upsample, 0);
my $sym = "SDL_${resample}_${from}_${channels}c";
$funcs{$hashid} = $sym;
$custom_converters++;
my $fudge = $fsize * $channels * 2; # !!! FIXME
my $eps_adjust = ($upsample) ? 'dstsize' : 'srcsize';
my $incr = '';
my $incr2 = '';
# !!! FIXME: DEBUG_CONVERT should report frequencies.
print <<EOF;
static void SDLCALL
${sym}(SDL_AudioCVT * cvt, SDL_AudioFormat format)
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{
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#if DEBUG_CONVERT
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fprintf(stderr, "$resample arbitrary (x%f) AUDIO_${from}, ${channels} channels.\\n", cvt->rate_incr);
#endif
const int srcsize = cvt->len_cvt - $fudge;
const int dstsize = (int) (((double)cvt->len_cvt) * cvt->rate_incr);
register int eps = 0;
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EOF
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my $endcomparison = '!=';
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# Upsampling (growing the buffer) needs to work backwards, since we
# overwrite the buffer as we go.
if ($upsample) {
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$endcomparison = '>'; # dst > target
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print <<EOF;
$fctype *dst = (($fctype *) (cvt->buf + dstsize)) - $channels;
const $fctype *src = (($fctype *) (cvt->buf + cvt->len_cvt)) - $channels;
const $fctype *target = ((const $fctype *) cvt->buf) - $channels;
EOF
} else {
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$endcomparison = '<'; # dst < target
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print <<EOF;
$fctype *dst = ($fctype *) cvt->buf;
const $fctype *src = ($fctype *) cvt->buf;
const $fctype *target = (const $fctype *) (cvt->buf + dstsize);
EOF
}
for (my $i = 0; $i < $channels; $i++) {
my $idx = ($upsample) ? (($channels - $i) - 1) : $i;
my $val = getSwapFunc($fsize, $fsigned, $ffloat, $fendian, "src[$idx]");
print <<EOF;
$fctype sample${idx} = $val;
EOF
}
for (my $i = 0; $i < $channels; $i++) {
my $idx = ($upsample) ? (($channels - $i) - 1) : $i;
print <<EOF;
$fctype last_sample${idx} = sample${idx};
EOF
}
print <<EOF;
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while (dst $endcomparison target) {
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EOF
if ($upsample) {
for (my $i = 0; $i < $channels; $i++) {
# !!! FIXME: don't do this swap every write, just when the samples change.
my $idx = (($channels - $i) - 1);
my $val = getSwapFunc($fsize, $fsigned, $ffloat, $fendian, "sample${idx}");
print <<EOF;
dst[$idx] = $val;
EOF
}
$incr = ($channels == 1) ? 'dst--' : "dst -= $channels";
$incr2 = ($channels == 1) ? 'src--' : "src -= $channels";
print <<EOF;
$incr;
eps += srcsize;
if ((eps << 1) >= dstsize) {
$incr2;
EOF
} else { # downsample.
$incr = ($channels == 1) ? 'src++' : "src += $channels";
print <<EOF;
$incr;
eps += dstsize;
if ((eps << 1) >= srcsize) {
EOF
for (my $i = 0; $i < $channels; $i++) {
my $val = getSwapFunc($fsize, $fsigned, $ffloat, $fendian, "sample${i}");
print <<EOF;
dst[$i] = $val;
EOF
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}
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$incr = ($channels == 1) ? 'dst++' : "dst += $channels";
print <<EOF;
$incr;
EOF
}
for (my $i = 0; $i < $channels; $i++) {
my $idx = ($upsample) ? (($channels - $i) - 1) : $i;
my $swapped = getSwapFunc($fsize, $fsigned, $ffloat, $fendian, "src[$idx]");
print <<EOF;
sample${idx} = ($fctype) (((($bigger) $swapped) + (($bigger) last_sample${idx})) $interp);
EOF
}
for (my $i = 0; $i < $channels; $i++) {
my $idx = ($upsample) ? (($channels - $i) - 1) : $i;
print <<EOF;
last_sample${idx} = sample${idx};
EOF
}
print <<EOF;
eps -= $eps_adjust;
}
}
EOF
print <<EOF;
cvt->len_cvt = dstsize;
if (cvt->filters[++cvt->filter_index]) {
cvt->filters[cvt->filter_index] (cvt, format);
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}
}
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EOF
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}
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# These handle clean resamples...doubling and quadrupling the sample rate, etc.
sub buildMultipleResampleFunc {
# !!! FIXME: we do a lot of unnecessary and ugly casting in here, due to getSwapFunc().
my ($from, $channels, $upsample, $multiple) = @_;
my ($fsigned, $ffloat, $fsize, $fendian, $fctype) = splittype($from);
my $bigger = getBiggerCtype($ffloat, $fsize);
my $interp = ($ffloat) ? '* 0.5' : '>> 1';
my $interp2 = ($ffloat) ? '* 0.25' : '>> 2';
my $mult3 = ($ffloat) ? '3.0' : '3';
my $lencvtop = ($upsample) ? '*' : '/';
my $resample = ($upsample) ? 'Upsample' : 'Downsample';
my $hashid = getResamplerHashId($from, $channels, $upsample, $multiple);
my $sym = "SDL_${resample}_${from}_${channels}c_x${multiple}";
$funcs{$hashid} = $sym;
$custom_converters++;
# !!! FIXME: DEBUG_CONVERT should report frequencies.
print <<EOF;
static void SDLCALL
${sym}(SDL_AudioCVT * cvt, SDL_AudioFormat format)
{
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#if DEBUG_CONVERT
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fprintf(stderr, "$resample (x${multiple}) AUDIO_${from}, ${channels} channels.\\n");
#endif
const int srcsize = cvt->len_cvt;
const int dstsize = cvt->len_cvt $lencvtop $multiple;
EOF
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my $endcomparison = '!=';
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# Upsampling (growing the buffer) needs to work backwards, since we
# overwrite the buffer as we go.
if ($upsample) {
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$endcomparison = '>'; # dst > target
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print <<EOF;
$fctype *dst = (($fctype *) (cvt->buf + dstsize)) - $channels;
const $fctype *src = (($fctype *) (cvt->buf + cvt->len_cvt)) - $channels;
const $fctype *target = ((const $fctype *) cvt->buf) - $channels;
EOF
} else {
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$endcomparison = '<'; # dst < target
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print <<EOF;
$fctype *dst = ($fctype *) cvt->buf;
const $fctype *src = ($fctype *) cvt->buf;
const $fctype *target = (const $fctype *) (cvt->buf + dstsize);
EOF
}
for (my $i = 0; $i < $channels; $i++) {
my $idx = ($upsample) ? (($channels - $i) - 1) : $i;
my $val = getSwapFunc($fsize, $fsigned, $ffloat, $fendian, "src[$idx]");
print <<EOF;
$bigger last_sample${idx} = ($bigger) $val;
EOF
}
print <<EOF;
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while (dst $endcomparison target) {
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EOF
for (my $i = 0; $i < $channels; $i++) {
my $idx = ($upsample) ? (($channels - $i) - 1) : $i;
my $val = getSwapFunc($fsize, $fsigned, $ffloat, $fendian, "src[$idx]");
print <<EOF;
const $bigger sample${idx} = ($bigger) $val;
EOF
}
my $incr = '';
if ($upsample) {
$incr = ($channels == 1) ? 'src--' : "src -= $channels";
} else {
my $amount = $channels * $multiple;
$incr = "src += $amount"; # can't ever be 1, so no "++" version.
}
print <<EOF;
$incr;
EOF
# !!! FIXME: This really begs for some Altivec or SSE, etc.
if ($upsample) {
if ($multiple == 2) {
for (my $i = $channels-1; $i >= 0; $i--) {
my $dsti = $i + $channels;
print <<EOF;
dst[$dsti] = ($fctype) ((sample${i} + last_sample${i}) $interp);
EOF
}
for (my $i = $channels-1; $i >= 0; $i--) {
my $dsti = $i;
print <<EOF;
dst[$dsti] = ($fctype) sample${i};
EOF
}
} elsif ($multiple == 4) {
for (my $i = $channels-1; $i >= 0; $i--) {
my $dsti = $i + ($channels * 3);
print <<EOF;
dst[$dsti] = ($fctype) sample${i};
EOF
}
for (my $i = $channels-1; $i >= 0; $i--) {
my $dsti = $i + ($channels * 2);
print <<EOF;
dst[$dsti] = ($fctype) ((($mult3 * sample${i}) + last_sample${i}) $interp2);
EOF
}
for (my $i = $channels-1; $i >= 0; $i--) {
my $dsti = $i + ($channels * 1);
print <<EOF;
dst[$dsti] = ($fctype) ((sample${i} + last_sample${i}) $interp);
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EOF
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}
for (my $i = $channels-1; $i >= 0; $i--) {
my $dsti = $i + ($channels * 0);
print <<EOF;
dst[$dsti] = ($fctype) ((sample${i} + ($mult3 * last_sample${i})) $interp2);
EOF
}
} else {
die('bug in program.'); # we only handle x2 and x4.
}
} else { # downsample.
if ($multiple == 2) {
for (my $i = 0; $i < $channels; $i++) {
print <<EOF;
dst[$i] = ($fctype) ((sample${i} + last_sample${i}) $interp);
EOF
}
} elsif ($multiple == 4) {
# !!! FIXME: interpolate all 4 samples?
for (my $i = 0; $i < $channels; $i++) {
print <<EOF;
dst[$i] = ($fctype) ((sample${i} + last_sample${i}) $interp);
EOF
}
} else {
die('bug in program.'); # we only handle x2 and x4.
}
}
for (my $i = 0; $i < $channels; $i++) {
my $idx = ($upsample) ? (($channels - $i) - 1) : $i;
print <<EOF;
last_sample${idx} = sample${idx};
EOF
}
if ($upsample) {
my $amount = $channels * $multiple;
$incr = "dst -= $amount"; # can't ever be 1, so no "--" version.
} else {
$incr = ($channels == 1) ? 'dst++' : "dst += $channels";
}
print <<EOF;
$incr;
}
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cvt->len_cvt = dstsize;
if (cvt->filters[++cvt->filter_index]) {
cvt->filters[cvt->filter_index] (cvt, format);
}
}
EOF
}
sub buildResamplers {
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print "#if !NO_RESAMPLERS\n\n";
foreach (@audiotypes) {
my $from = $_;
foreach (@channels) {
my $channel = $_;
buildArbitraryResampleFunc($from, $channel, 1);
buildArbitraryResampleFunc($from, $channel, 0);
}
}
print "\n#if !LESS_RESAMPLERS\n\n";
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foreach (@audiotypes) {
my $from = $_;
foreach (@channels) {
my $channel = $_;
for (my $multiple = 2; $multiple <= 4; $multiple += 2) {
buildMultipleResampleFunc($from, $channel, 1, $multiple);
buildMultipleResampleFunc($from, $channel, 0, $multiple);
}
}
}
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print "#endif /* !LESS_RESAMPLERS */\n";
print "#endif /* !NO_RESAMPLERS */\n\n\n";
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print "const SDL_AudioRateFilters sdl_audio_rate_filters[] =\n{\n";
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print "#if !NO_RESAMPLERS\n";
foreach (@audiotypes) {
my $from = $_;
foreach (@channels) {
my $channel = $_;
for (my $upsample = 0; $upsample <= 1; $upsample++) {
my $hashid = getResamplerHashId($from, $channel, $upsample, 0);
my $sym = $funcs{$hashid};
print(" { AUDIO_$from, $channel, $upsample, 0, $sym },\n");
}
}
}
print "#if !LESS_RESAMPLERS\n";
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foreach (@audiotypes) {
my $from = $_;
foreach (@channels) {
my $channel = $_;
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for (my $multiple = 2; $multiple <= 4; $multiple += 2) {
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for (my $upsample = 0; $upsample <= 1; $upsample++) {
my $hashid = getResamplerHashId($from, $channel, $upsample, $multiple);
my $sym = $funcs{$hashid};
print(" { AUDIO_$from, $channel, $upsample, $multiple, $sym },\n");
}
}
}
}
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print "#endif /* !LESS_RESAMPLERS */\n";
print "#endif /* !NO_RESAMPLERS */\n";
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print(" { 0, 0, 0, 0, NULL }\n");
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print "};\n\n";
}
# mainline ...
outputHeader();
buildTypeConverters();
buildResamplers();
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outputFooter();
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exit 0;
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# end of sdlgenaudiocvt.pl ...