mirror of
https://github.com/Relintai/sdl2_frt.git
synced 2024-12-16 11:06:49 +01:00
Reworked audio converter code.
This no longer uses a script to generate code for every possible type conversion or resampler. This caused a bloat in binary size and and compile times. Now we use a handful of more generic functions and assume staying in the CPU cache is the most important thing anyhow. This shrinks the size of the final build (in this case: macOS X amd64, -Os to optimize for size) by 15%. When compiling on a single core, build times drop by about 15% too (although the previous cost was largely hidden by multicore builds).
This commit is contained in:
Ryan C. Gordon
parent
7e65d88f01
commit
f3456e9a93
@ -20,6 +20,16 @@
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*/
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#include "../SDL_internal.h"
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#ifndef DEBUG_CONVERT
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#define DEBUG_CONVERT 0
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#endif
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#if DEBUG_CONVERT
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#define LOG_DEBUG_CONVERT(from, to) fprintf(stderr, "Converting %s to %s.\n", from, to);
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#else
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#define LOG_DEBUG_CONVERT(from, to)
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#endif
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/* Functions and variables exported from SDL_audio.c for SDL_sysaudio.c */
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/* Functions to get a list of "close" audio formats */
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@ -29,24 +39,20 @@ extern SDL_AudioFormat SDL_NextAudioFormat(void);
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/* Function to calculate the size and silence for a SDL_AudioSpec */
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extern void SDL_CalculateAudioSpec(SDL_AudioSpec * spec);
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/* this is used internally to access some autogenerated code. */
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typedef struct
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{
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SDL_AudioFormat src_fmt;
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SDL_AudioFormat dst_fmt;
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SDL_AudioFilter filter;
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} SDL_AudioTypeFilters;
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extern const SDL_AudioTypeFilters sdl_audio_type_filters[];
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/* this is used internally to access some autogenerated code. */
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typedef struct
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{
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SDL_AudioFormat fmt;
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int channels;
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int upsample;
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int multiple;
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SDL_AudioFilter filter;
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} SDL_AudioRateFilters;
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extern const SDL_AudioRateFilters sdl_audio_rate_filters[];
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void SDLCALL SDL_Convert_S8_to_F32(SDL_AudioCVT *cvt, SDL_AudioFormat format);
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void SDLCALL SDL_Convert_U8_to_F32(SDL_AudioCVT *cvt, SDL_AudioFormat format);
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void SDLCALL SDL_Convert_S16_to_F32(SDL_AudioCVT *cvt, SDL_AudioFormat format);
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void SDLCALL SDL_Convert_U16_to_F32(SDL_AudioCVT *cvt, SDL_AudioFormat format);
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void SDLCALL SDL_Convert_S32_to_F32(SDL_AudioCVT *cvt, SDL_AudioFormat format);
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void SDLCALL SDL_Convert_F32_to_S8(SDL_AudioCVT *cvt, SDL_AudioFormat format);
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void SDLCALL SDL_Convert_F32_to_U8(SDL_AudioCVT *cvt, SDL_AudioFormat format);
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void SDLCALL SDL_Convert_F32_to_S16(SDL_AudioCVT *cvt, SDL_AudioFormat format);
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void SDLCALL SDL_Convert_F32_to_U16(SDL_AudioCVT *cvt, SDL_AudioFormat format);
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void SDLCALL SDL_Convert_F32_to_S32(SDL_AudioCVT *cvt, SDL_AudioFormat format);
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void SDL_Upsample_Arbitrary(SDL_AudioCVT *cvt, const int channels);
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void SDL_Downsample_Arbitrary(SDL_AudioCVT *cvt, const int channels);
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void SDL_Upsample_x2(SDL_AudioCVT *cvt, const int channels);
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void SDL_Upsample_x4(SDL_AudioCVT *cvt, const int channels);
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void SDL_Downsample_Multiple(SDL_AudioCVT *cvt, const int multiple, const int channels);
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/* vi: set ts=4 sw=4 expandtab: */
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File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
@ -1,761 +0,0 @@
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#!/usr/bin/perl -w
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use warnings;
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use strict;
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my @audiotypes = qw(
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U8
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S8
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U16LSB
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S16LSB
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U16MSB
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S16MSB
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S32LSB
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S32MSB
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F32LSB
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F32MSB
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);
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my @channels = ( 1, 2, 4, 6, 8 );
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my %funcs;
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my $custom_converters = 0;
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sub getTypeConvertHashId {
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my ($from, $to) = @_;
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return "TYPECONVERTER $from/$to";
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}
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sub getResamplerHashId {
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my ($from, $channels, $upsample, $multiple) = @_;
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return "RESAMPLER $from/$channels/$upsample/$multiple";
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}
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sub outputHeader {
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print <<EOF;
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/* DO NOT EDIT! This file is generated by sdlgenaudiocvt.pl */
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2016 Sam Lantinga <slouken\@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.h"
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#include "SDL_audio.h"
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#include "SDL_audio_c.h"
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#ifndef DEBUG_CONVERT
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#define DEBUG_CONVERT 0
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#endif
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/* If you can guarantee your data and need space, you can eliminate code... */
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/* Just build the arbitrary resamplers if you're saving code space. */
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#ifndef LESS_RESAMPLERS
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#define LESS_RESAMPLERS 0
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#endif
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/* Don't build any resamplers if you're REALLY saving code space. */
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#ifndef NO_RESAMPLERS
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#define NO_RESAMPLERS 0
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#endif
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/* Don't build any type converters if you're saving code space. */
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#ifndef NO_CONVERTERS
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#define NO_CONVERTERS 0
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#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) {
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my $val = $_;
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my $fval = 1.0 / $val;
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print("#define DIVBY${val} ${fval}f\n");
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}
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print("\n");
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}
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sub outputFooter {
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print <<EOF;
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/* $custom_converters converters generated. */
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/* *INDENT-ON* */
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/* vi: set ts=4 sw=4 expandtab: */
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EOF
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}
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sub splittype {
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my $t = shift;
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my ($signed, $size, $endian) = $t =~ /([USF])(\d+)([LM]SB|)/;
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my $float = ($signed eq 'F') ? 1 : 0;
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$signed = (($float) or ($signed eq 'S')) ? 1 : 0;
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$endian = 'NONE' if ($endian eq '');
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my $ctype = '';
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if ($float) {
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$ctype = (($size == 32) ? 'float' : 'double');
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} else {
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$ctype = (($signed) ? 'S' : 'U') . "int${size}";
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}
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return ($signed, $float, $size, $endian, $ctype);
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}
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sub getSwapFunc {
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my ($size, $signed, $float, $endian, $val) = @_;
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my $BEorLE = (($endian eq 'MSB') ? 'BE' : 'LE');
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my $code = '';
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if ($float) {
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$code = "SDL_SwapFloat${BEorLE}($val)";
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} else {
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if ($size > 8) {
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$code = "SDL_Swap${BEorLE}${size}($val)";
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} else {
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$code = $val;
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}
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if (($signed) and (!$float)) {
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$code = "((Sint${size}) $code)";
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}
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}
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return "${code}";
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}
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sub maxIntVal {
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my $size = shift;
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if ($size == 8) {
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return 0x7F;
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} elsif ($size == 16) {
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return 0x7FFF;
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} elsif ($size == 32) {
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return 0x7FFFFFFF;
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}
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die("bug in script.\n");
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}
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sub getFloatToIntMult {
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my $size = shift;
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my $val = maxIntVal($size) . '.0';
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$val .= 'f' if ($size < 32);
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return $val;
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}
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sub getIntToFloatDivBy {
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my $size = shift;
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return 'DIVBY' . maxIntVal($size);
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}
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sub getSignFlipVal {
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my $size = shift;
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if ($size == 8) {
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return '0x80';
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} elsif ($size == 16) {
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return '0x8000';
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} elsif ($size == 32) {
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return '0x80000000';
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}
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die("bug in script.\n");
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}
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sub buildCvtFunc {
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my ($from, $to) = @_;
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my ($fsigned, $ffloat, $fsize, $fendian, $fctype) = splittype($from);
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my ($tsigned, $tfloat, $tsize, $tendian, $tctype) = splittype($to);
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my $diffs = 0;
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$diffs++ if ($fsize != $tsize);
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$diffs++ if ($fsigned != $tsigned);
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$diffs++ if ($ffloat != $tfloat);
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$diffs++ if ($fendian ne $tendian);
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return if ($diffs == 0);
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my $hashid = getTypeConvertHashId($from, $to);
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if (1) { # !!! FIXME: if ($diffs > 1) {
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my $sym = "SDL_Convert_${from}_to_${to}";
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$funcs{$hashid} = $sym;
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$custom_converters++;
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# Always unsigned for ints, for possible byteswaps.
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my $srctype = (($ffloat) ? 'float' : "Uint${fsize}");
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print <<EOF;
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static void SDLCALL
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${sym}(SDL_AudioCVT * cvt, SDL_AudioFormat format)
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{
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int i;
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const $srctype *src;
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$tctype *dst;
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#if DEBUG_CONVERT
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fprintf(stderr, "Converting AUDIO_${from} to AUDIO_${to}.\\n");
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#endif
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EOF
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if ($fsize < $tsize) {
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my $mult = $tsize / $fsize;
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print <<EOF;
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src = ((const $srctype *) (cvt->buf + cvt->len_cvt)) - 1;
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dst = (($tctype *) (cvt->buf + cvt->len_cvt * $mult)) - 1;
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for (i = cvt->len_cvt / sizeof ($srctype); i; --i, --src, --dst) {
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EOF
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} else {
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print <<EOF;
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src = (const $srctype *) cvt->buf;
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dst = ($tctype *) cvt->buf;
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for (i = cvt->len_cvt / sizeof ($srctype); i; --i, ++src, ++dst) {
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EOF
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}
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# Have to convert to/from float/int.
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# !!! FIXME: cast through double for int32<->float?
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my $code = getSwapFunc($fsize, $fsigned, $ffloat, $fendian, '*src');
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if ($ffloat != $tfloat) {
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if ($ffloat) {
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my $mult = getFloatToIntMult($tsize);
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if (!$tsigned) { # bump from -1.0f/1.0f to 0.0f/2.0f
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$code = "($code + 1.0f)";
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}
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$code = "(($tctype) ($code * $mult))";
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} else {
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# $divby will be the reciprocal, to avoid pipeline stalls
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# 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.
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$code = "($code - 1.0f)";
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}
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}
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} else {
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# All integer conversions here.
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if ($fsigned != $tsigned) {
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my $signflipval = getSignFlipVal($fsize);
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$code = "(($code) ^ $signflipval)";
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}
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my $shiftval = abs($fsize - $tsize);
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if ($fsize < $tsize) {
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$code = "((($tctype) $code) << $shiftval)";
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} elsif ($fsize > $tsize) {
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$code = "(($tctype) ($code >> $shiftval))";
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}
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}
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my $swap = getSwapFunc($tsize, $tsigned, $tfloat, $tendian, 'val');
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print <<EOF;
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const $tctype val = $code;
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*dst = ${swap};
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}
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EOF
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if ($fsize > $tsize) {
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my $divby = $fsize / $tsize;
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print(" cvt->len_cvt /= $divby;\n");
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} elsif ($fsize < $tsize) {
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my $mult = $tsize / $fsize;
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print(" cvt->len_cvt *= $mult;\n");
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}
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print <<EOF;
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if (cvt->filters[++cvt->filter_index]) {
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cvt->filters[cvt->filter_index] (cvt, AUDIO_$to);
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}
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}
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EOF
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} else {
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if ($fsigned != $tsigned) {
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$funcs{$hashid} = 'SDL_ConvertSigned';
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} elsif ($ffloat != $tfloat) {
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$funcs{$hashid} = 'SDL_ConvertFloat';
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} elsif ($fsize != $tsize) {
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$funcs{$hashid} = 'SDL_ConvertSize';
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} elsif ($fendian ne $tendian) {
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$funcs{$hashid} = 'SDL_ConvertEndian';
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} else {
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die("error in script.\n");
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}
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}
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}
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sub buildTypeConverters {
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print "#if !NO_CONVERTERS\n\n";
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foreach (@audiotypes) {
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my $from = $_;
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foreach (@audiotypes) {
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my $to = $_;
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buildCvtFunc($from, $to);
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}
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}
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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 = $_;
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foreach (@audiotypes) {
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my $to = $_;
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if ($from ne $to) {
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my $hashid = getTypeConvertHashId($from, $to);
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my $sym = $funcs{$hashid};
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print(" { AUDIO_$from, AUDIO_$to, $sym },\n");
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}
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}
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}
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print "#endif /* !NO_CONVERTERS */\n";
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print(" { 0, 0, NULL }\n");
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print "};\n\n\n";
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}
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sub getBiggerCtype {
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my ($isfloat, $size) = @_;
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if ($isfloat) {
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if ($size == 32) {
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return 'double';
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}
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die("bug in script.\n");
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}
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if ($size == 8) {
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return 'Sint16';
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} elsif ($size == 16) {
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return 'Sint32'
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} elsif ($size == 32) {
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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.
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# Man, this code is skanky.
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sub buildArbitraryResampleFunc {
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# !!! FIXME: we do a lot of unnecessary and ugly casting in here, due to getSwapFunc().
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my ($from, $channels, $upsample) = @_;
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my ($fsigned, $ffloat, $fsize, $fendian, $fctype) = splittype($from);
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my $bigger = getBiggerCtype($ffloat, $fsize);
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my $interp = ($ffloat) ? '* 0.5' : '>> 1';
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my $resample = ($upsample) ? 'Upsample' : 'Downsample';
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my $hashid = getResamplerHashId($from, $channels, $upsample, 0);
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my $sym = "SDL_${resample}_${from}_${channels}c";
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$funcs{$hashid} = $sym;
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$custom_converters++;
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my $fudge = $fsize * $channels * 2; # !!! FIXME
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my $eps_adjust = ($upsample) ? 'dstsize' : 'srcsize';
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my $incr = '';
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my $incr2 = '';
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my $block_align = $channels * $fsize/8;
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# !!! FIXME: DEBUG_CONVERT should report frequencies.
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print <<EOF;
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static void SDLCALL
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${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);
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#endif
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const int srcsize = cvt->len_cvt - $fudge;
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const int dstsize = (int) (((double)(cvt->len_cvt/${block_align})) * cvt->rate_incr) * ${block_align};
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register int eps = 0;
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EOF
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my $endcomparison = '!=';
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# Upsampling (growing the buffer) needs to work backwards, since we
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# overwrite the buffer as we go.
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if ($upsample) {
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$endcomparison = '>='; # dst > target
|
||||
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);
|
||||
EOF
|
||||
} else {
|
||||
$endcomparison = '<'; # dst < target
|
||||
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;
|
||||
while (dst $endcomparison target) {
|
||||
EOF
|
||||
|
||||
if ($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
|
||||
}
|
||||
|
||||
$incr = ($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 -= $eps_adjust;
|
||||
}
|
||||
}
|
||||
EOF
|
||||
|
||||
print <<EOF;
|
||||
cvt->len_cvt = dstsize;
|
||||
if (cvt->filters[++cvt->filter_index]) {
|
||||
cvt->filters[cvt->filter_index] (cvt, format);
|
||||
}
|
||||
}
|
||||
|
||||
EOF
|
||||
|
||||
}
|
||||
|
||||
# These handle clean resamples...doubling and quadrupling the sample rate, etc.
|
||||
sub buildMultipleResampleFunc {
|
||||
# !!! FIXME: we do a lot of unnecessary and ugly casting in here, due to getSwapFunc().
|
||||
my ($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
|
||||
${sym}(SDL_AudioCVT * cvt, SDL_AudioFormat format)
|
||||
{
|
||||
#if DEBUG_CONVERT
|
||||
fprintf(stderr, "$resample (x${multiple}) AUDIO_${from}, ${channels} channels.\\n");
|
||||
#endif
|
||||
|
||||
const int dstsize = cvt->len_cvt $lencvtop $multiple;
|
||||
EOF
|
||||
|
||||
my $endcomparison = '!=';
|
||||
|
||||
# Upsampling (growing the buffer) needs to work backwards, since we
|
||||
# overwrite the buffer as we go.
|
||||
if ($upsample) {
|
||||
$endcomparison = '>='; # dst > target
|
||||
print <<EOF;
|
||||
$fctype *dst = (($fctype *) (cvt->buf + dstsize)) - $channels * $multiple;
|
||||
const $fctype *src = (($fctype *) (cvt->buf + cvt->len_cvt)) - $channels;
|
||||
const $fctype *target = ((const $fctype *) cvt->buf);
|
||||
EOF
|
||||
} else {
|
||||
$endcomparison = '<'; # dst < target
|
||||
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;
|
||||
while (dst $endcomparison target) {
|
||||
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${i} + ($mult3 * last_sample${i})) $interp2);
|
||||
EOF
|
||||
}
|
||||
|
||||
for (my $i = $channels-1; $i >= 0; $i--) {
|
||||
my $dsti = $i + ($channels * 2);
|
||||
print <<EOF;
|
||||
dst[$dsti] = ($fctype) ((sample${i} + last_sample${i}) $interp);
|
||||
EOF
|
||||
}
|
||||
|
||||
for (my $i = $channels-1; $i >= 0; $i--) {
|
||||
my $dsti = $i + ($channels * 1);
|
||||
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 * 0);
|
||||
print <<EOF;
|
||||
dst[$dsti] = ($fctype) sample${i};
|
||||
EOF
|
||||
}
|
||||
} else {
|
||||
die('bug in program.'); # we only handle x2 and x4.
|
||||
}
|
||||
} else { # downsample.
|
||||
if ($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;
|
||||
}
|
||||
|
||||
cvt->len_cvt = dstsize;
|
||||
if (cvt->filters[++cvt->filter_index]) {
|
||||
cvt->filters[cvt->filter_index] (cvt, format);
|
||||
}
|
||||
}
|
||||
|
||||
EOF
|
||||
|
||||
}
|
||||
|
||||
sub buildResamplers {
|
||||
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";
|
||||
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);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
print "#endif /* !LESS_RESAMPLERS */\n";
|
||||
print "#endif /* !NO_RESAMPLERS */\n\n\n";
|
||||
|
||||
print "const SDL_AudioRateFilters sdl_audio_rate_filters[] =\n{\n";
|
||||
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";
|
||||
foreach (@audiotypes) {
|
||||
my $from = $_;
|
||||
foreach (@channels) {
|
||||
my $channel = $_;
|
||||
for (my $multiple = 2; $multiple <= 4; $multiple += 2) {
|
||||
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");
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
print "#endif /* !LESS_RESAMPLERS */\n";
|
||||
print "#endif /* !NO_RESAMPLERS */\n";
|
||||
print(" { 0, 0, 0, 0, NULL }\n");
|
||||
print "};\n\n";
|
||||
}
|
||||
|
||||
|
||||
# mainline ...
|
||||
|
||||
outputHeader();
|
||||
buildTypeConverters();
|
||||
buildResamplers();
|
||||
outputFooter();
|
||||
|
||||
exit 0;
|
||||
|
||||
# end of sdlgenaudiocvt.pl ...
|
||||
|
||||
Loading…
Reference in New Issue
Block a user