| #!/usr/bin/perl -w |
| |
| use warnings; |
| use strict; |
| |
| my @audiotypes = qw( |
| U8 |
| S8 |
| U16LSB |
| S16LSB |
| U16MSB |
| S16MSB |
| S32LSB |
| S32MSB |
| F32LSB |
| F32MSB |
| ); |
| |
| my %funcs; |
| |
| my $custom_converters = 0; |
| |
| |
| sub outputHeader { |
| print <<EOF; |
| /* DO NOT EDIT! This file is generated by sdlgenaudiocvt.pl */ |
| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2006 Sam Lantinga |
| |
| 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" |
| |
| /* *INDENT-OFF* */ |
| |
| EOF |
| |
| my @vals = ( 127, 32767, 2147483647 ); |
| foreach (@vals) { |
| my $val = $_; |
| my $fval = 1.0 / $val; |
| print("#define DIVBY${val} ${fval}f\n"); |
| } |
| |
| print("\n"); |
| } |
| |
| sub outputFooter { |
| print <<EOF; |
| /* *INDENT-ON* */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |
| EOF |
| } |
| |
| 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 { |
| my $size = shift; |
| if ($size == 8) { |
| return 0x7F; |
| } elsif ($size == 16) { |
| return 0x7FFF; |
| } elsif ($size == 32) { |
| return 0x7FFFFFFF; |
| } |
| |
| die("bug in script.\n"); |
| } |
| |
| sub getFloatToIntMult { |
| my $size = shift; |
| my $val = maxIntVal($size) . '.0'; |
| $val .= 'f' if ($size < 32); |
| return $val; |
| } |
| |
| sub getIntToFloatDivBy { |
| my $size = shift; |
| return 'DIVBY' . maxIntVal($size); |
| } |
| |
| 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); |
| |
| my $hashid = "$from/$to"; |
| if (1) { # !!! FIXME: if ($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; |
| $tctype *dst; |
| |
| #ifdef DEBUG_CONVERT |
| fprintf(stderr, "Converting AUDIO_${from} to AUDIO_${to}.\\n"); |
| #endif |
| |
| EOF |
| |
| if ($fsize < $tsize) { |
| my $mult = $tsize / $fsize; |
| print <<EOF; |
| src = (const $srctype *) (cvt->buf + cvt->len_cvt); |
| dst = ($tctype *) (cvt->buf + cvt->len_cvt * $mult); |
| for (i = cvt->len_cvt / sizeof ($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) { |
| my $mult = getFloatToIntMult($tsize); |
| if (!$tsigned) { # bump from -1.0f/1.0f to 0.0f/2.0f |
| $code = "($code + 1.0f)"; |
| } |
| $code = "(($tctype) ($code * $mult))"; |
| } else { |
| # $divby will be the reciprocal, to avoid pipeline stalls |
| # from floating point division...so multiply it. |
| my $divby = getIntToFloatDivBy($fsize); |
| $code = "(((float) $code) * $divby)"; |
| if (!$fsigned) { # bump from 0.0f/2.0f to -1.0f/1.0f. |
| $code = "($code - 1.0f)"; |
| } |
| } |
| } 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 *= $mult;\n"); |
| } |
| |
| print <<EOF; |
| format = AUDIO_$to; |
| if (cvt->filters[++cvt->filter_index]) { |
| cvt->filters[cvt->filter_index] (cvt, format); |
| } |
| } |
| |
| 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"); |
| } |
| } |
| } |
| |
| outputHeader(); |
| |
| foreach (@audiotypes) { |
| my $from = $_; |
| foreach (@audiotypes) { |
| my $to = $_; |
| buildCvtFunc($from, $to); |
| } |
| } |
| |
| print <<EOF; |
| const SDL_AudioTypeFilters sdl_audio_type_filters[] = |
| { |
| EOF |
| |
| foreach (@audiotypes) { |
| my $from = $_; |
| foreach (@audiotypes) { |
| my $to = $_; |
| if ($from ne $to) { |
| my $hashid = "$from/$to"; |
| my $sym = $funcs{$hashid}; |
| print(" { AUDIO_$from, AUDIO_$to, $sym },\n"); |
| } |
| } |
| } |
| |
| print <<EOF; |
| }; |
| |
| |
| EOF |
| |
| outputFooter(); |
| |
| exit 0; |
| |
| # end of sdlgenaudiocvt.pl ... |
| |