From 49ec8db5f8ba9d386451487bb9e1698ab58346a0 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Tue, 19 Jul 2022 22:04:49 -0400
Subject: [PATCH] audio: Generate the channel converter code from a program.
---
build-scripts/gen_audio_channel_conversion.c | 450 ++++++
src/audio/SDL_audio_channel_converters.h | 1459 ++++++++++++++++++
src/audio/SDL_audiocvt.c | 1155 +-------------
3 files changed, 1911 insertions(+), 1153 deletions(-)
create mode 100644 build-scripts/gen_audio_channel_conversion.c
create mode 100644 src/audio/SDL_audio_channel_converters.h
diff --git a/build-scripts/gen_audio_channel_conversion.c b/build-scripts/gen_audio_channel_conversion.c
new file mode 100644
index 00000000000..e74ed2674c4
--- /dev/null
+++ b/build-scripts/gen_audio_channel_conversion.c
@@ -0,0 +1,450 @@
+/*
+ Simple DirectMedia Layer
+ Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
+
+ 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]++;
+ }
+ }
+ }
+
+ printf("static void SDLCALL\n"
+ "SDL_Convert%sTo%s(SDL_AudioCVT *cvt, SDL_AudioFormat format)\n"
+ "{\n", remove_dots(fromstr), remove_dots(tostr));
+
+ if (convert_backwards) { /* must convert backwards when growing the output in-place. */
+ printf(" float *dst = ((float *) (cvt->buf + ((cvt->len_cvt / %d) * %d)));\n", fromchans, tochans - 1);
+ printf(" const float *src = ((const float *) (cvt->buf + cvt->len_cvt)) - %d;\n", fromchans);
+ } else {
+ printf(" float *dst = (float *) cvt->buf;\n");
+ printf(" const float *src = dst;\n");
+ }
+
+ printf(" int i;\n"
+ "\n"
+ " LOG_DEBUG_CONVERT(\"%s\", \"%s\");\n"
+ " SDL_assert(format == AUDIO_F32SYS);\n"
+ "\n", lowercase(fromstr), lowercase(tostr));
+
+ if (convert_backwards) {
+ printf(" /* convert backwards, since output is growing in-place. */\n");
+ printf(" for (i = cvt->len_cvt / (sizeof (float) * %d); i; i--, src -= %d, dst -= %d) {\n", fromchans, fromchans, tochans);
+ 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 {
+ printf(" for (i = cvt->len_cvt / (sizeof (float) * %d); i; i--, src += %d, dst += %d) {\n", fromchans, fromchans, tochans);
+
+ 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");
+ }
+
+ printf("\n");
+
+ if ((fromchans > 1) && (tochans > 1)) {
+ printf(" cvt->len_cvt = (cvt->len_cvt / %d) * %d;\n", fromchans, tochans);
+ } else if (tochans == 1) {
+ printf(" cvt->len_cvt = cvt->len_cvt / %d;\n", fromchans);
+ } else /* if (fromchans == 1) */ {
+ printf(" cvt->len_cvt = cvt->len_cvt * %d;\n", tochans);
+ }
+
+ printf(" if (cvt->filters[++cvt->filter_index]) {\n"
+ " cvt->filters[cvt->filter_index] (cvt, format);\n"
+ " }\n"
+ "}\n\n");
+}
+
+int main(void)
+{
+ int ini, outi;
+
+ printf(
+ "/*\n"
+ " Simple DirectMedia Layer\n"
+ " Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>\n"
+ "\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"
+ "/* DO NOT EDIT, THIS FILE WAS GENERATED BY build-scripts/gen_audio_channel_conversion.c */\n"
+ "\n"
+ );
+
+ for (ini = 1; ini <= NUM_CHANNELS; ini++) {
+ for (outi = 1; outi <= NUM_CHANNELS; outi++) {
+ write_converter(ini, outi);
+ }
+ }
+
+ printf("static const SDL_AudioFilter channel_converters[%d][%d] = { /* [from][to] */\n", NUM_CHANNELS, NUM_CHANNELS);
+ 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");
+ printf("/* vi: set ts=4 sw=4 expandtab: */\n\n");
+
+ return 0;
+}
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/src/audio/SDL_audio_channel_converters.h b/src/audio/SDL_audio_channel_converters.h
new file mode 100644
index 00000000000..5794a1205c8
--- /dev/null
+++ b/src/audio/SDL_audio_channel_converters.h
@@ -0,0 +1,1459 @@
+/*
+ Simple DirectMedia Layer
+ Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
+
+ 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 softwa
(Patch may be truncated, please check the link at the top of this post.)