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SDL/build-scripts/gen_audio_channel_conversion.c

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audio: Generate the channel converter code from a program.
2022-07-19 20:04:49 -06:00
/*
Simple DirectMedia Layer
Updated copyright for 2024
2024-01-01 14:15:26 -07:00
Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
audio: Generate the channel converter code from a program.
2022-07-19 20:04:49 -06:00
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include <stdio.h>
/*
Built with:
gcc -o genchancvt build-scripts/gen_audio_channel_conversion.c -lm && ./genchancvt > src/audio/SDL_audio_channel_converters.h
*/
#define NUM_CHANNELS 8
static const char *layout_names[NUM_CHANNELS] = {
"Mono", "Stereo", "2.1", "Quad", "4.1", "5.1", "6.1", "7.1"
};
static const char *channel_names[NUM_CHANNELS][NUM_CHANNELS] = {
/* mono */ { "FC" },
/* stereo */ { "FL", "FR" },
/* 2.1 */ { "FL", "FR", "LFE" },
/* quad */ { "FL", "FR", "BL", "BR" },
/* 4.1 */ { "FL", "FR", "LFE", "BL", "BR" },
/* 5.1 */ { "FL", "FR", "FC", "LFE", "BL", "BR" },
/* 6.1 */ { "FL", "FR", "FC", "LFE", "BC", "SL", "SR" },
/* 7.1 */ { "FL", "FR", "FC", "LFE", "BL", "BR", "SL", "SR" },
};
/*
* This table is from FAudio:
*
* https://raw.githubusercontent.com/FNA-XNA/FAudio/master/src/matrix_defaults.inl
*/
static const float channel_conversion_matrix[8][8][64] = {
{
/* 1 x 1 */
{ 1.000000000f },
/* 1 x 2 */
{ 1.000000000f, 1.000000000f },
/* 1 x 3 */
{ 1.000000000f, 1.000000000f, 0.000000000f },
/* 1 x 4 */
{ 1.000000000f, 1.000000000f, 0.000000000f, 0.000000000f },
/* 1 x 5 */
{ 1.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
/* 1 x 6 */
{ 1.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
/* 1 x 7 */
{ 1.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
/* 1 x 8 */
{ 1.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f }
},
{
/* 2 x 1 */
{ 0.500000000f, 0.500000000f },
/* 2 x 2 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f },
/* 2 x 3 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f },
/* 2 x 4 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
/* 2 x 5 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
/* 2 x 6 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
/* 2 x 7 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
/* 2 x 8 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f }
},
{
/* 3 x 1 */
{ 0.333333343f, 0.333333343f, 0.333333343f },
/* 3 x 2 */
{ 0.800000012f, 0.000000000f, 0.200000003f, 0.000000000f, 0.800000012f, 0.200000003f },
/* 3 x 3 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f },
/* 3 x 4 */
{ 0.888888896f, 0.000000000f, 0.111111112f, 0.000000000f, 0.888888896f, 0.111111112f, 0.000000000f, 0.000000000f, 0.111111112f, 0.000000000f, 0.000000000f, 0.111111112f },
/* 3 x 5 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
/* 3 x 6 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
/* 3 x 7 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
/* 3 x 8 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f }
},
{
/* 4 x 1 */
{ 0.250000000f, 0.250000000f, 0.250000000f, 0.250000000f },
/* 4 x 2 */
{ 0.421000004f, 0.000000000f, 0.358999997f, 0.219999999f, 0.000000000f, 0.421000004f, 0.219999999f, 0.358999997f },
/* 4 x 3 */
{ 0.421000004f, 0.000000000f, 0.358999997f, 0.219999999f, 0.000000000f, 0.421000004f, 0.219999999f, 0.358999997f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
/* 4 x 4 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f },
/* 4 x 5 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f },
/* 4 x 6 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f },
/* 4 x 7 */
{ 0.939999998f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.939999998f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.500000000f, 0.500000000f, 0.000000000f, 0.000000000f, 0.796000004f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.796000004f },
/* 4 x 8 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f }
},
{
/* 5 x 1 */
{ 0.200000003f, 0.200000003f, 0.200000003f, 0.200000003f, 0.200000003f },
/* 5 x 2 */
{ 0.374222219f, 0.000000000f, 0.111111112f, 0.319111109f, 0.195555553f, 0.000000000f, 0.374222219f, 0.111111112f, 0.195555553f, 0.319111109f },
/* 5 x 3 */
{ 0.421000004f, 0.000000000f, 0.000000000f, 0.358999997f, 0.219999999f, 0.000000000f, 0.421000004f, 0.000000000f, 0.219999999f, 0.358999997f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f },
/* 5 x 4 */
{ 0.941176474f, 0.000000000f, 0.058823530f, 0.000000000f, 0.000000000f, 0.000000000f, 0.941176474f, 0.058823530f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.058823530f, 0.941176474f, 0.000000000f, 0.000000000f, 0.000000000f, 0.058823530f, 0.000000000f, 0.941176474f },
/* 5 x 5 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f },
/* 5 x 6 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f },
/* 5 x 7 */
{ 0.939999998f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.939999998f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.500000000f, 0.500000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.796000004f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.796000004f },
/* 5 x 8 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f }
},
{
/* 6 x 1 */
{ 0.166666672f, 0.166666672f, 0.166666672f, 0.166666672f, 0.166666672f, 0.166666672f },
/* 6 x 2 */
{ 0.294545442f, 0.000000000f, 0.208181813f, 0.090909094f, 0.251818180f, 0.154545456f, 0.000000000f, 0.294545442f, 0.208181813f, 0.090909094f, 0.154545456f, 0.251818180f },
/* 6 x 3 */
{ 0.324000001f, 0.000000000f, 0.229000002f, 0.000000000f, 0.277000010f, 0.170000002f, 0.000000000f, 0.324000001f, 0.229000002f, 0.000000000f, 0.170000002f, 0.277000010f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f },
/* 6 x 4 */
{ 0.558095276f, 0.000000000f, 0.394285709f, 0.047619049f, 0.000000000f, 0.000000000f, 0.000000000f, 0.558095276f, 0.394285709f, 0.047619049f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.047619049f, 0.558095276f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.047619049f, 0.000000000f, 0.558095276f },
/* 6 x 5 */
{ 0.586000025f, 0.000000000f, 0.414000005f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.586000025f, 0.414000005f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.586000025f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.586000025f },
/* 6 x 6 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f },
/* 6 x 7 */
{ 0.939999998f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.939999998f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.939999998f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.500000000f, 0.500000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.796000004f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.796000004f },
/* 6 x 8 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f }
},
{
/* 7 x 1 */
{ 0.143142849f, 0.143142849f, 0.143142849f, 0.142857149f, 0.143142849f, 0.143142849f, 0.143142849f },
/* 7 x 2 */
{ 0.247384623f, 0.000000000f, 0.174461529f, 0.076923080f, 0.174461529f, 0.226153851f, 0.100615382f, 0.000000000f, 0.247384623f, 0.174461529f, 0.076923080f, 0.174461529f, 0.100615382f, 0.226153851f },
/* 7 x 3 */
{ 0.268000007f, 0.000000000f, 0.188999996f, 0.000000000f, 0.188999996f, 0.245000005f, 0.108999997f, 0.000000000f, 0.268000007f, 0.188999996f, 0.000000000f, 0.188999996f, 0.108999997f, 0.245000005f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
/* 7 x 4 */
{ 0.463679999f, 0.000000000f, 0.327360004f, 0.040000003f, 0.000000000f, 0.168960005f, 0.000000000f, 0.000000000f, 0.463679999f, 0.327360004f, 0.040000003f, 0.000000000f, 0.000000000f, 0.168960005f, 0.000000000f, 0.000000000f, 0.000000000f, 0.040000003f, 0.327360004f, 0.431039989f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.040000003f, 0.327360004f, 0.000000000f, 0.431039989f },
/* 7 x 5 */
{ 0.483000010f, 0.000000000f, 0.340999991f, 0.000000000f, 0.000000000f, 0.175999999f, 0.000000000f, 0.000000000f, 0.483000010f, 0.340999991f, 0.000000000f, 0.000000000f, 0.000000000f, 0.175999999f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.340999991f, 0.449000001f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.340999991f, 0.000000000f, 0.449000001f },
/* 7 x 6 */
{ 0.611000001f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.223000005f, 0.000000000f, 0.000000000f, 0.611000001f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.223000005f, 0.000000000f, 0.000000000f, 0.611000001f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.432000011f, 0.568000019f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.432000011f, 0.000000000f, 0.568000019f },
/* 7 x 7 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f },
/* 7 x 8 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.707000017f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.707000017f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f }
},
{
/* 8 x 1 */
{ 0.125125006f, 0.125125006f, 0.125125006f, 0.125000000f, 0.125125006f, 0.125125006f, 0.125125006f, 0.125125006f },
/* 8 x 2 */
{ 0.211866662f, 0.000000000f, 0.150266662f, 0.066666670f, 0.181066677f, 0.111066669f, 0.194133341f, 0.085866667f, 0.000000000f, 0.211866662f, 0.150266662f, 0.066666670f, 0.111066669f, 0.181066677f, 0.085866667f, 0.194133341f },
/* 8 x 3 */
{ 0.226999998f, 0.000000000f, 0.160999998f, 0.000000000f, 0.194000006f, 0.119000003f, 0.208000004f, 0.092000000f, 0.000000000f, 0.226999998f, 0.160999998f, 0.000000000f, 0.119000003f, 0.194000006f, 0.092000000f, 0.208000004f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
/* 8 x 4 */
{ 0.466344833f, 0.000000000f, 0.329241365f, 0.034482758f, 0.000000000f, 0.000000000f, 0.169931039f, 0.000000000f, 0.000000000f, 0.466344833f, 0.329241365f, 0.034482758f, 0.000000000f, 0.000000000f, 0.000000000f, 0.169931039f, 0.000000000f, 0.000000000f, 0.000000000f, 0.034482758f, 0.466344833f, 0.000000000f, 0.433517247f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.034482758f, 0.000000000f, 0.466344833f, 0.000000000f, 0.433517247f },
/* 8 x 5 */
{ 0.483000010f, 0.000000000f, 0.340999991f, 0.000000000f, 0.000000000f, 0.000000000f, 0.175999999f, 0.000000000f, 0.000000000f, 0.483000010f, 0.340999991f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.175999999f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.483000010f, 0.000000000f, 0.449000001f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.483000010f, 0.000000000f, 0.449000001f },
/* 8 x 6 */
{ 0.518000007f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.188999996f, 0.000000000f, 0.000000000f, 0.518000007f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.188999996f, 0.000000000f, 0.000000000f, 0.518000007f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.518000007f, 0.000000000f, 0.481999993f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.518000007f, 0.000000000f, 0.481999993f },
/* 8 x 7 */
{ 0.541000009f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.541000009f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.541000009f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.287999988f, 0.287999988f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.458999991f, 0.000000000f, 0.541000009f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.458999991f, 0.000000000f, 0.541000009f },
/* 8 x 8 */
{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f }
}
};
static char *remove_dots(const char *str) /* this is NOT robust. */
{
static char retval1[32];
static char retval2[32];
static int idx = 0;
char *retval = (idx++ & 1) ? retval1 : retval2;
char *ptr = retval;
while (*str) {
if (*str != '.') {
*(ptr++) = *str;
}
str++;
}
*ptr = '\0';
return retval;
}
static char *lowercase(const char *str) /* this is NOT robust. */
{
static char retval1[32];
static char retval2[32];
static int idx = 0;
char *retval = (idx++ & 1) ? retval1 : retval2;
char *ptr = retval;
while (*str) {
const char ch = *(str++);
*(ptr++) = ((ch >= 'A') && (ch <= 'Z')) ? (ch - ('A' - 'a')) : ch;
}
*ptr = '\0';
return retval;
}
static void write_converter(const int fromchans, const int tochans)
{
const char *fromstr = layout_names[fromchans-1];
const char *tostr = layout_names[tochans-1];
const float *cvtmatrix = channel_conversion_matrix[fromchans-1][tochans-1];
const float *fptr;
const int convert_backwards = (tochans > fromchans);
int input_channel_used[NUM_CHANNELS];
int i, j;
if (tochans == fromchans) {
return; /* nothing to convert, don't generate a converter. */
}
for (i = 0; i < fromchans; i++) {
input_channel_used[i] = 0;
}
fptr = cvtmatrix;
for (j = 0; j < tochans; j++) {
for (i = 0; i < fromchans; i++) {
#if 0
printf("to=%d, from=%d, coeff=%f\n", j, i, *fptr);
#endif
if (*(fptr++) != 0.0f) {
input_channel_used[i]++;
}
}
}
audio: Redesigned audio conversion code for SDL3. - SDL_AudioCVT is gone, even internally. - libsamplerate is gone (I suspect our resampler is finally Good Enough). - Cleanups and improvements to audio conversion interfaces. - SDL_AudioStream can change its input/output format/rate/channels on the fly!
2023-04-01 20:29:30 -06:00
printf("static void SDL_Convert%sTo%s(float *dst, const float *src, int num_frames)\n{\n", remove_dots(fromstr), remove_dots(tostr));
audio: Generate the channel converter code from a program.
2022-07-19 20:04:49 -06:00
printf(" int i;\n"
"\n"
audio: Redesigned audio conversion code for SDL3. - SDL_AudioCVT is gone, even internally. - libsamplerate is gone (I suspect our resampler is finally Good Enough). - Cleanups and improvements to audio conversion interfaces. - SDL_AudioStream can change its input/output format/rate/channels on the fly!
2023-04-01 20:29:30 -06:00
" LOG_DEBUG_AUDIO_CONVERT(\"%s\", \"%s\");\n"
audio: Generate the channel converter code from a program.
2022-07-19 20:04:49 -06:00
"\n", lowercase(fromstr), lowercase(tostr));
audio: Redesigned audio conversion code for SDL3. - SDL_AudioCVT is gone, even internally. - libsamplerate is gone (I suspect our resampler is finally Good Enough). - Cleanups and improvements to audio conversion interfaces. - SDL_AudioStream can change its input/output format/rate/channels on the fly!
2023-04-01 20:29:30 -06:00
if (convert_backwards) { /* must convert backwards when growing the output in-place. */
audio: Cleaned out most remaining `/* */` comments for `//` style. Fully committing to it...! This left SDL_wave.* alone for now, since there's a ton of comments in there and this code hasn't changed much from SDL2 so far. But as SDL2 ages out a little more, I'll likely switch this over, too.
2023-10-18 13:35:09 -06:00
printf(" // convert backwards, since output is growing in-place.\n");
audio: Redesigned audio conversion code for SDL3. - SDL_AudioCVT is gone, even internally. - libsamplerate is gone (I suspect our resampler is finally Good Enough). - Cleanups and improvements to audio conversion interfaces. - SDL_AudioStream can change its input/output format/rate/channels on the fly!
2023-04-01 20:29:30 -06:00
printf(" src += (num_frames-1)");
if (fromchans != 1) {
printf(" * %d", fromchans);
}
printf(";\n");
printf(" dst += (num_frames-1)");
if (tochans != 1) {
printf(" * %d", tochans);
}
printf(";\n");
Fixed crash in new audio channel conversion code Each loop needs to be run num_frames times, and the source and destination pointers are incremented by the number of channels during the conversion.
2023-05-04 16:50:38 -06:00
printf(" for (i = num_frames; i; i--, ");
audio: Redesigned audio conversion code for SDL3. - SDL_AudioCVT is gone, even internally. - libsamplerate is gone (I suspect our resampler is finally Good Enough). - Cleanups and improvements to audio conversion interfaces. - SDL_AudioStream can change its input/output format/rate/channels on the fly!
2023-04-01 20:29:30 -06:00
if (fromchans == 1) {
printf("src--");
} else {
printf("src -= %d", fromchans);
}
printf(", ");
if (tochans == 1) {
printf("dst--");
} else {
printf("dst -= %d", tochans);
}
printf(") {\n");
audio: Generate the channel converter code from a program.
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fptr = cvtmatrix;
for (i = 0; i < fromchans; i++) {
if (input_channel_used[i] > 1) { /* don't read it from src more than once. */
printf(" const float src%s = src[%d];\n", channel_names[fromchans-1][i], i);
}
}
for (j = tochans - 1; j >= 0; j--) {
int has_input = 0;
fptr = cvtmatrix + (fromchans * j);
printf(" dst[%d] /* %s */ =", j, channel_names[tochans-1][j]);
for (i = fromchans - 1; i >= 0; i--) {
const float coefficient = fptr[i];
char srcname[32];
if (coefficient == 0.0f) {
continue;
} else if (input_channel_used[i] > 1) {
snprintf(srcname, sizeof (srcname), "src%s", channel_names[fromchans-1][i]);
} else {
snprintf(srcname, sizeof (srcname), "src[%d]", i);
}
if (has_input) {
printf(" +");
}
has_input = 1;
if (coefficient == 1.0f) {
printf(" %s", srcname);
} else {
printf(" (%s * %.9ff)", srcname, coefficient);
}
}
if (!has_input) {
printf(" 0.0f");
}
printf(";\n");
}
printf(" }\n");
} else {
Fixed crash in new audio channel conversion code Each loop needs to be run num_frames times, and the source and destination pointers are incremented by the number of channels during the conversion.
2023-05-04 16:50:38 -06:00
printf(" for (i = num_frames; i; i--, ");
audio: Redesigned audio conversion code for SDL3. - SDL_AudioCVT is gone, even internally. - libsamplerate is gone (I suspect our resampler is finally Good Enough). - Cleanups and improvements to audio conversion interfaces. - SDL_AudioStream can change its input/output format/rate/channels on the fly!
2023-04-01 20:29:30 -06:00
if (fromchans == 1) {
printf("src++");
} else {
printf("src += %d", fromchans);
}
printf(", ");
if (tochans == 1) {
printf("dst++");
} else {
printf("dst += %d", tochans);
}
printf(") {\n");
audio: Generate the channel converter code from a program.
2022-07-19 20:04:49 -06:00
fptr = cvtmatrix;
for (i = 0; i < fromchans; i++) {
if (input_channel_used[i] > 1) { /* don't read it from src more than once. */
printf(" const float src%s = src[%d];\n", channel_names[fromchans-1][i], i);
}
}
for (j = 0; j < tochans; j++) {
int has_input = 0;
fptr = cvtmatrix + (fromchans * j);
printf(" dst[%d] /* %s */ =", j, channel_names[tochans-1][j]);
for (i = 0; i < fromchans; i++) {
const float coefficient = fptr[i];
char srcname[32];
if (coefficient == 0.0f) {
continue;
} else if (input_channel_used[i] > 1) {
snprintf(srcname, sizeof (srcname), "src%s", channel_names[fromchans-1][i]);
} else {
snprintf(srcname, sizeof (srcname), "src[%d]", i);
}
if (has_input) {
printf(" +");
}
has_input = 1;
if (coefficient == 1.0f) {
printf(" %s", srcname);
} else {
printf(" (%s * %.9ff)", srcname, coefficient);
}
}
if (!has_input) {
printf(" 0.0f");
}
printf(";\n");
}
printf(" }\n");
}
audio: Redesigned audio conversion code for SDL3. - SDL_AudioCVT is gone, even internally. - libsamplerate is gone (I suspect our resampler is finally Good Enough). - Cleanups and improvements to audio conversion interfaces. - SDL_AudioStream can change its input/output format/rate/channels on the fly!
2023-04-01 20:29:30 -06:00
printf("\n}\n\n");
audio: Generate the channel converter code from a program.
2022-07-19 20:04:49 -06:00
}
int main(void)
{
int ini, outi;
printf(
"/*\n"
" Simple DirectMedia Layer\n"
Updated copyright for 2024
2024-01-01 14:15:26 -07:00
" Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>\n"
audio: Generate the channel converter code from a program.
2022-07-19 20:04:49 -06:00
"\n"
" This software is provided 'as-is', without any express or implied\n"
" warranty. In no event will the authors be held liable for any damages\n"
" arising from the use of this software.\n"
"\n"
" Permission is granted to anyone to use this software for any purpose,\n"
" including commercial applications, and to alter it and redistribute it\n"
" freely, subject to the following restrictions:\n"
"\n"
" 1. The origin of this software must not be misrepresented; you must not\n"
" claim that you wrote the original software. If you use this software\n"
" in a product, an acknowledgment in the product documentation would be\n"
" appreciated but is not required.\n"
" 2. Altered source versions must be plainly marked as such, and must not be\n"
" misrepresented as being the original software.\n"
" 3. This notice may not be removed or altered from any source distribution.\n"
"*/\n"
"\n"
audio: Cleaned out most remaining `/* */` comments for `//` style. Fully committing to it...! This left SDL_wave.* alone for now, since there's a ton of comments in there and this code hasn't changed much from SDL2 so far. But as SDL2 ages out a little more, I'll likely switch this over, too.
2023-10-18 13:35:09 -06:00
"// DO NOT EDIT, THIS FILE WAS GENERATED BY build-scripts/gen_audio_channel_conversion.c\n"
audio: Generate the channel converter code from a program.
2022-07-19 20:04:49 -06:00
"\n"
audio: Redesigned audio conversion code for SDL3. - SDL_AudioCVT is gone, even internally. - libsamplerate is gone (I suspect our resampler is finally Good Enough). - Cleanups and improvements to audio conversion interfaces. - SDL_AudioStream can change its input/output format/rate/channels on the fly!
2023-04-01 20:29:30 -06:00
"\n"
"typedef void (*SDL_AudioChannelConverter)(float *dst, const float *src, int num_frames);\n"
"\n"
audio: Generate the channel converter code from a program.
2022-07-19 20:04:49 -06:00
);
for (ini = 1; ini <= NUM_CHANNELS; ini++) {
for (outi = 1; outi <= NUM_CHANNELS; outi++) {
write_converter(ini, outi);
}
}
audio: Redesigned audio conversion code for SDL3. - SDL_AudioCVT is gone, even internally. - libsamplerate is gone (I suspect our resampler is finally Good Enough). - Cleanups and improvements to audio conversion interfaces. - SDL_AudioStream can change its input/output format/rate/channels on the fly!
2023-04-01 20:29:30 -06:00
printf("static const SDL_AudioChannelConverter channel_converters[%d][%d] = { /* [from][to] */\n", NUM_CHANNELS, NUM_CHANNELS);
audio: Generate the channel converter code from a program.
2022-07-19 20:04:49 -06:00
for (ini = 1; ini <= NUM_CHANNELS; ini++) {
const char *comma = "";
printf(" {");
for (outi = 1; outi <= NUM_CHANNELS; outi++) {
const char *fromstr = layout_names[ini-1];
const char *tostr = layout_names[outi-1];
if (ini == outi) {
printf("%s NULL", comma);
} else {
printf("%s SDL_Convert%sTo%s", comma, remove_dots(fromstr), remove_dots(tostr));
}
comma = ",";
}
printf(" }%s\n", (ini == NUM_CHANNELS) ? "" : ",");
}
printf("};\n\n");
return 0;
}