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audio: Generate the channel converter code from a program.
This commit is contained in:
Ryan C. Gordon
parent
f06cc3e945
commit
49ec8db5f8
450
build-scripts/gen_audio_channel_conversion.c
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build-scripts/gen_audio_channel_conversion.c
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2022 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 <stdio.h>
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/*
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Built with:
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gcc -o genchancvt build-scripts/gen_audio_channel_conversion.c -lm && ./genchancvt > src/audio/SDL_audio_channel_converters.h
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*/
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#define NUM_CHANNELS 8
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static const char *layout_names[NUM_CHANNELS] = {
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"Mono", "Stereo", "2.1", "Quad", "4.1", "5.1", "6.1", "7.1"
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};
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static const char *channel_names[NUM_CHANNELS][NUM_CHANNELS] = {
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/* mono */ { "FC" },
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/* stereo */ { "FL", "FR" },
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/* 2.1 */ { "FL", "FR", "LFE" },
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/* quad */ { "FL", "FR", "BL", "BR" },
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/* 4.1 */ { "FL", "FR", "LFE", "BL", "BR" },
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/* 5.1 */ { "FL", "FR", "FC", "LFE", "BL", "BR" },
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/* 6.1 */ { "FL", "FR", "FC", "LFE", "BC", "SL", "SR" },
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/* 7.1 */ { "FL", "FR", "FC", "LFE", "BL", "BR", "SL", "SR" },
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};
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/*
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* This table is from FAudio:
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*
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* https://raw.githubusercontent.com/FNA-XNA/FAudio/master/src/matrix_defaults.inl
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*/
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static const float channel_conversion_matrix[8][8][64] = {
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{
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/* 1 x 1 */
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{ 1.000000000f },
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/* 1 x 2 */
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{ 1.000000000f, 1.000000000f },
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/* 1 x 3 */
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{ 1.000000000f, 1.000000000f, 0.000000000f },
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/* 1 x 4 */
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{ 1.000000000f, 1.000000000f, 0.000000000f, 0.000000000f },
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/* 1 x 5 */
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{ 1.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
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/* 1 x 6 */
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{ 1.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
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/* 1 x 7 */
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{ 1.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
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/* 1 x 8 */
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{ 1.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f }
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},
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{
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/* 2 x 1 */
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{ 0.500000000f, 0.500000000f },
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/* 2 x 2 */
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{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f },
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/* 2 x 3 */
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{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f },
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/* 2 x 4 */
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{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
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/* 2 x 5 */
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{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
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/* 2 x 6 */
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{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
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/* 2 x 7 */
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{ 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 },
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/* 2 x 8 */
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{ 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 }
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},
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{
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/* 3 x 1 */
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{ 0.333333343f, 0.333333343f, 0.333333343f },
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/* 3 x 2 */
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{ 0.800000012f, 0.000000000f, 0.200000003f, 0.000000000f, 0.800000012f, 0.200000003f },
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/* 3 x 3 */
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{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f },
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/* 3 x 4 */
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{ 0.888888896f, 0.000000000f, 0.111111112f, 0.000000000f, 0.888888896f, 0.111111112f, 0.000000000f, 0.000000000f, 0.111111112f, 0.000000000f, 0.000000000f, 0.111111112f },
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/* 3 x 5 */
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{ 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 },
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/* 3 x 6 */
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{ 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 },
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/* 3 x 7 */
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{ 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 },
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/* 3 x 8 */
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{ 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 }
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},
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{
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/* 4 x 1 */
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{ 0.250000000f, 0.250000000f, 0.250000000f, 0.250000000f },
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/* 4 x 2 */
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{ 0.421000004f, 0.000000000f, 0.358999997f, 0.219999999f, 0.000000000f, 0.421000004f, 0.219999999f, 0.358999997f },
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/* 4 x 3 */
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{ 0.421000004f, 0.000000000f, 0.358999997f, 0.219999999f, 0.000000000f, 0.421000004f, 0.219999999f, 0.358999997f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
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/* 4 x 4 */
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{ 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 },
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/* 4 x 5 */
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{ 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 },
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/* 4 x 6 */
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{ 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 },
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/* 4 x 7 */
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{ 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 },
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/* 4 x 8 */
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{ 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 }
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},
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{
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/* 5 x 1 */
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{ 0.200000003f, 0.200000003f, 0.200000003f, 0.200000003f, 0.200000003f },
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/* 5 x 2 */
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{ 0.374222219f, 0.000000000f, 0.111111112f, 0.319111109f, 0.195555553f, 0.000000000f, 0.374222219f, 0.111111112f, 0.195555553f, 0.319111109f },
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/* 5 x 3 */
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{ 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 },
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/* 5 x 4 */
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{ 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 },
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/* 5 x 5 */
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{ 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 },
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/* 5 x 6 */
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{ 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 },
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/* 5 x 7 */
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{ 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 },
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/* 5 x 8 */
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{ 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 }
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},
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{
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/* 6 x 1 */
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{ 0.166666672f, 0.166666672f, 0.166666672f, 0.166666672f, 0.166666672f, 0.166666672f },
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/* 6 x 2 */
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{ 0.294545442f, 0.000000000f, 0.208181813f, 0.090909094f, 0.251818180f, 0.154545456f, 0.000000000f, 0.294545442f, 0.208181813f, 0.090909094f, 0.154545456f, 0.251818180f },
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/* 6 x 3 */
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{ 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 },
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/* 6 x 4 */
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{ 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 },
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/* 6 x 5 */
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{ 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 },
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/* 6 x 6 */
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{ 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 },
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/* 6 x 7 */
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{ 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 },
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/* 6 x 8 */
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{ 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 }
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},
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{
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/* 7 x 1 */
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{ 0.143142849f, 0.143142849f, 0.143142849f, 0.142857149f, 0.143142849f, 0.143142849f, 0.143142849f },
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/* 7 x 2 */
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{ 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 },
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/* 7 x 3 */
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{ 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 },
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/* 7 x 4 */
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{ 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 },
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/* 7 x 5 */
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{ 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 },
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/* 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: */
|
||||
1459
src/audio/SDL_audio_channel_converters.h
Normal file
1459
src/audio/SDL_audio_channel_converters.h
Normal file
File diff suppressed because it is too large
Load diff
File diff suppressed because it is too large
Load diff
Loading…
Reference in a new issue