| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2024 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))) - %d;\n", fromchans, tochans, tochans); |
| 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) 1997-2024 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: */ |
