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gen_audio_channel_conversion.c

gen_audio_channel_conversion.c 29 KB
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  1. /*
    2. 

  2.   Simple DirectMedia Layer
    3. 

  3.   Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
    4. 

  4. 

  5.   This software is provided 'as-is', without any express or implied
    6. 

  6.   warranty.  In no event will the authors be held liable for any damages
    7. 

  7.   arising from the use of this software.
    8. 

  8. 

  9.   Permission is granted to anyone to use this software for any purpose,
    10. 

  10.   including commercial applications, and to alter it and redistribute it
    11. 

  11.   freely, subject to the following restrictions:
    12. 

  12. 

  13.   1. The origin of this software must not be misrepresented; you must not
    14. 

  14.      claim that you wrote the original software. If you use this software
    15. 

  15.      in a product, an acknowledgment in the product documentation would be
    16. 

  16.      appreciated but is not required.
    17. 

  17.   2. Altered source versions must be plainly marked as such, and must not be
    18. 

  18.      misrepresented as being the original software.
    19. 

  19.   3. This notice may not be removed or altered from any source distribution.
    20. 

  20. */
    21. 

  21. 

  22. #include <stdio.h>
    23. 

  23. 

  24. /*
    25. 

  25. 

  26. Built with:
    27. 

  27. 

  28. gcc -o genchancvt build-scripts/gen_audio_channel_conversion.c -lm && ./genchancvt > src/audio/SDL_audio_channel_converters.h
    29. 

  29. 

  30. */
    31. 

  31. 

  32. #define NUM_CHANNELS 8
    33. 

  33. 

  34. static const char *layout_names[NUM_CHANNELS] = {
    35. 

  35.     "Mono", "Stereo", "2.1", "Quad", "4.1", "5.1", "6.1", "7.1"
    36. 

  36. };
    37. 

  37. 

  38. static const char *channel_names[NUM_CHANNELS][NUM_CHANNELS] = {
    39. 

  39.     /* mono */   { "FC" },
    40. 

  40.     /* stereo */ { "FL", "FR" },
    41. 

  41.     /* 2.1 */    { "FL", "FR", "LFE" },
    42. 

  42.     /* quad */   { "FL", "FR", "BL", "BR" },
    43. 

  43.     /* 4.1 */    { "FL", "FR", "LFE", "BL", "BR" },
    44. 

  44.     /* 5.1 */    { "FL", "FR", "FC", "LFE", "BL", "BR" },
    45. 

  45.     /* 6.1 */    { "FL", "FR", "FC", "LFE", "BC", "SL", "SR" },
    46. 

  46.     /* 7.1 */    { "FL", "FR", "FC", "LFE", "BL", "BR", "SL", "SR" },
    47. 

  47. };
    48. 

  48. 

  49. 

  50. /*
    51. 

  51.  * This table is from FAudio:
    52. 

  52.  *
    53. 

  53.  *  https://raw.githubusercontent.com/FNA-XNA/FAudio/master/src/matrix_defaults.inl
    54. 

  54.  */
    55. 

  55. static const float channel_conversion_matrix[8][8][64] = {
    56. 

  56. {
    57. 

  57. 	/* 1 x 1 */
    58. 

  58. 	{ 1.000000000f },
    59. 

  59. 	/* 1 x 2 */
    60. 

  60. 	{ 1.000000000f, 1.000000000f },
    61. 

  61. 	/* 1 x 3 */
    62. 

  62. 	{ 1.000000000f, 1.000000000f, 0.000000000f },
    63. 

  63. 	/* 1 x 4 */
    64. 

  64. 	{ 1.000000000f, 1.000000000f, 0.000000000f, 0.000000000f },
    65. 

  65. 	/* 1 x 5 */
    66. 

  66. 	{ 1.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
    67. 

  67. 	/* 1 x 6 */
    68. 

  68. 	{ 1.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
    69. 

  69. 	/* 1 x 7 */
    70. 

  70. 	{ 1.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
    71. 

  71. 	/* 1 x 8 */
    72. 

  72. 	{ 1.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f }
    73. 

  73. },
    74. 

  74. {
    75. 

  75. 	/* 2 x 1 */
    76. 

  76. 	{ 0.500000000f, 0.500000000f },
    77. 

  77. 	/* 2 x 2 */
    78. 

  78. 	{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f },
    79. 

  79. 	/* 2 x 3 */
    80. 

  80. 	{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f },
    81. 

  81. 	/* 2 x 4 */
    82. 

  82. 	{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
    83. 

  83. 	/* 2 x 5 */
    84. 

  84. 	{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
    85. 

  85. 	/* 2 x 6 */
    86. 

  86. 	{ 1.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
    87. 

  87. 	/* 2 x 7 */
    88. 

  88. 	{ 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 },
    89. 

  89. 	/* 2 x 8 */
    90. 

  90. 	{ 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 }
    91. 

  91. },
    92. 

  92. {
    93. 

  93. 	/* 3 x 1 */
    94. 

  94. 	{ 0.333333343f, 0.333333343f, 0.333333343f },
    95. 

  95. 	/* 3 x 2 */
    96. 

  96. 	{ 0.800000012f, 0.000000000f, 0.200000003f, 0.000000000f, 0.800000012f, 0.200000003f },
    97. 

  97. 	/* 3 x 3 */
    98. 

  98. 	{ 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f, 0.000000000f, 0.000000000f, 0.000000000f, 1.000000000f },
    99. 

  99. 	/* 3 x 4 */
    100. 

  100. 	{ 0.888888896f, 0.000000000f, 0.111111112f, 0.000000000f, 0.888888896f, 0.111111112f, 0.000000000f, 0.000000000f, 0.111111112f, 0.000000000f, 0.000000000f, 0.111111112f },
    101. 

  101. 	/* 3 x 5 */
    102. 

  102. 	{ 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 },
    103. 

  103. 	/* 3 x 6 */
    104. 

  104. 	{ 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 },
    105. 

  105. 	/* 3 x 7 */
    106. 

  106. 	{ 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 },
    107. 

  107. 	/* 3 x 8 */
    108. 

  108. 	{ 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 }
    109. 

  109. },
    110. 

  110. {
    111. 

  111. 	/* 4 x 1 */
    112. 

  112. 	{ 0.250000000f, 0.250000000f, 0.250000000f, 0.250000000f },
    113. 

  113. 	/* 4 x 2 */
    114. 

  114. 	{ 0.421000004f, 0.000000000f, 0.358999997f, 0.219999999f, 0.000000000f, 0.421000004f, 0.219999999f, 0.358999997f },
    115. 

  115. 	/* 4 x 3 */
    116. 

  116. 	{ 0.421000004f, 0.000000000f, 0.358999997f, 0.219999999f, 0.000000000f, 0.421000004f, 0.219999999f, 0.358999997f, 0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f },
    117. 

  117. 	/* 4 x 4 */
    118. 

  118. 	{ 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 },
    119. 

  119. 	/* 4 x 5 */
    120. 

  120. 	{ 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 },
    121. 

  121. 	/* 4 x 6 */
    122. 

  122. 	{ 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 },
    123. 

  123. 	/* 4 x 7 */
    124. 

  124. 	{ 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 },
    125. 

  125. 	/* 4 x 8 */
    126. 

  126. 	{ 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 }
    127. 

  127. },
    128. 

  128. {
    129. 

  129. 	/* 5 x 1 */
    130. 

  130. 	{ 0.200000003f, 0.200000003f, 0.200000003f, 0.200000003f, 0.200000003f },
    131. 

  131. 	/* 5 x 2 */
    132. 

  132. 	{ 0.374222219f, 0.000000000f, 0.111111112f, 0.319111109f, 0.195555553f, 0.000000000f, 0.374222219f, 0.111111112f, 0.195555553f, 0.319111109f },
    133. 

  133. 	/* 5 x 3 */
    134. 

  134. 	{ 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 },
    135. 

  135. 	/* 5 x 4 */
    136. 

  136. 	{ 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 },
    137. 

  137. 	/* 5 x 5 */
    138. 

  138. 	{ 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 },
    139. 

  139. 	/* 5 x 6 */
    140. 

  140. 	{ 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 },
    141. 

  141. 	/* 5 x 7 */
    142. 

  142. 	{ 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 },
    143. 

  143. 	/* 5 x 8 */
    144. 

  144. 	{ 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 }
    145. 

  145. },
    146. 

  146. {
    147. 

  147. 	/* 6 x 1 */
    148. 

  148. 	{ 0.166666672f, 0.166666672f, 0.166666672f, 0.166666672f, 0.166666672f, 0.166666672f },
    149. 

  149. 	/* 6 x 2 */
    150. 

  150. 	{ 0.294545442f, 0.000000000f, 0.208181813f, 0.090909094f, 0.251818180f, 0.154545456f, 0.000000000f, 0.294545442f, 0.208181813f, 0.090909094f, 0.154545456f, 0.251818180f },
    151. 

  151. 	/* 6 x 3 */
    152. 

  152. 	{ 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 },
    153. 

  153. 	/* 6 x 4 */
    154. 

  154. 	{ 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 },
    155. 

  155. 	/* 6 x 5 */
    156. 

  156. 	{ 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 },
    157. 

  157. 	/* 6 x 6 */
    158. 

  158. 	{ 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 },
    159. 

  159. 	/* 6 x 7 */
    160. 

  160. 	{ 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 },
    161. 

  161. 	/* 6 x 8 */
    162. 

  162. 	{ 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 }
    163. 

  163. },
    164. 

  164. {
    165. 

  165. 	/* 7 x 1 */
    166. 

  166. 	{ 0.143142849f, 0.143142849f, 0.143142849f, 0.142857149f, 0.143142849f, 0.143142849f, 0.143142849f },
    167. 

  167. 	/* 7 x 2 */
    168. 

  168. 	{ 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 },
    169. 

  169. 	/* 7 x 3 */
    170. 

  170. 	{ 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 },
    171. 

  171. 	/* 7 x 4 */
    172. 

  172. 	{ 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 },
    173. 

  173. 	/* 7 x 5 */
    174. 

  174. 	{ 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 },
    175. 

  175. 	/* 7 x 6 */
    176. 

  176. 	{ 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 },
    177. 

  177. 	/* 7 x 7 */
    178. 

  178. 	{ 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 },
    179. 

  179. 	/* 7 x 8 */
    180. 

  180. 	{ 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 }
    181. 

  181. },
    182. 

  182. {
    183. 

  183. 	/* 8 x 1 */
    184. 

  184. 	{ 0.125125006f, 0.125125006f, 0.125125006f, 0.125000000f, 0.125125006f, 0.125125006f, 0.125125006f, 0.125125006f },
    185. 

  185. 	/* 8 x 2 */
    186. 

  186. 	{ 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 },
    187. 

  187. 	/* 8 x 3 */
    188. 

  188. 	{ 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 },
    189. 

  189. 	/* 8 x 4 */
    190. 

  190. 	{ 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 },
    191. 

  191. 	/* 8 x 5 */
    192. 

  192. 	{ 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 },
    193. 

  193. 	/* 8 x 6 */
    194. 

  194. 	{ 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 },
    195. 

  195. 	/* 8 x 7 */
    196. 

  196. 	{ 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 },
    197. 

  197. 	/* 8 x 8 */
    198. 

  198. 	{ 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 }
    199. 

  199. }
    200. 

  200. };
    201. 

  201. 

  202. static char *remove_dots(const char *str)  /* this is NOT robust. */
    203. 

  203. {
    204. 

  204.     static char retval1[32];
    205. 

  205.     static char retval2[32];
    206. 

  206.     static int idx = 0;
    207. 

  207.     char *retval = (idx++ & 1) ? retval1 : retval2;
    208. 

  208.     char *ptr = retval;
    209. 

  209.     while (*str) {
    210. 

  210.         if (*str != '.') {
    211. 

  211.             *(ptr++) = *str;
    212. 

  212.         }
    213. 

  213.         str++;
    214. 

  214.     }
    215. 

  215.     *ptr = '\0';
    216. 

  216.     return retval;
    217. 

  217. }
    218. 

  218. 

  219. static char *lowercase(const char *str)  /* this is NOT robust. */
    220. 

  220. {
    221. 

  221.     static char retval1[32];
    222. 

  222.     static char retval2[32];
    223. 

  223.     static int idx = 0;
    224. 

  224.     char *retval = (idx++ & 1) ? retval1 : retval2;
    225. 

  225.     char *ptr = retval;
    226. 

  226.     while (*str) {
    227. 

  227.         const char ch = *(str++);
    228. 

  228.         *(ptr++) = ((ch >= 'A') && (ch <= 'Z')) ? (ch - ('A' - 'a')) : ch;
    229. 

  229.     }
    230. 

  230.     *ptr = '\0';
    231. 

  231.     return retval;
    232. 

  232. }
    233. 

  233. 

  234. static void write_converter(const int fromchans, const int tochans)
    235. 

  235. {
    236. 

  236.     const char *fromstr = layout_names[fromchans-1];
    237. 

  237.     const char *tostr = layout_names[tochans-1];
    238. 

  238.     const float *cvtmatrix = channel_conversion_matrix[fromchans-1][tochans-1];
    239. 

  239.     const float *fptr;
    240. 

  240.     const int convert_backwards = (tochans > fromchans);
    241. 

  241.     int input_channel_used[NUM_CHANNELS];
    242. 

  242.     int i, j;
    243. 

  243. 

  244.     if (tochans == fromchans) {
    245. 

  245.         return;  /* nothing to convert, don't generate a converter. */
    246. 

  246.     }
    247. 

  247. 

  248.     for (i = 0; i < fromchans; i++) {
    249. 

  249.         input_channel_used[i] = 0;
    250. 

  250.     }
    251. 

  251. 

  252.     fptr = cvtmatrix;
    253. 

  253.     for (j = 0; j < tochans; j++) {
    254. 

  254.         for (i = 0; i < fromchans; i++) {
    255. 

  255.             #if 0
    256. 

  256.             printf("to=%d, from=%d, coeff=%f\n", j, i, *fptr);
    257. 

  257.             #endif
    258. 

  258.             if (*(fptr++) != 0.0f) {
    259. 

  259.                 input_channel_used[i]++;
    260. 

  260.             }
    261. 

  261.         }
    262. 

  262.     }
    263. 

  263. 

  264.     printf("static void SDL_Convert%sTo%s(float *dst, const float *src, int num_frames)\n{\n", remove_dots(fromstr), remove_dots(tostr));
    265. 

  265. 

  266.     printf("    int i;\n"
    267. 

  267.            "\n"
    268. 

  268.            "    LOG_DEBUG_AUDIO_CONVERT(\"%s\", \"%s\");\n"
    269. 

  269.            "\n", lowercase(fromstr), lowercase(tostr));
    270. 

  270. 

  271.     if (convert_backwards) {  /* must convert backwards when growing the output in-place. */
    272. 

  272.         printf("    // convert backwards, since output is growing in-place.\n");
    273. 

  273.         printf("    src += (num_frames-1)");
    274. 

  274.         if (fromchans != 1) {
    275. 

  275.             printf(" * %d", fromchans);
    276. 

  276.         }
    277. 

  277.         printf(";\n");
    278. 

  278. 

  279.         printf("    dst += (num_frames-1)");
    280. 

  280.         if (tochans != 1) {
    281. 

  281.             printf(" * %d", tochans);
    282. 

  282.         }
    283. 

  283.         printf(";\n");
    284. 

  284.         printf("    for (i = num_frames; i; i--, ");
    285. 

  285.         if (fromchans == 1) {
    286. 

  286.             printf("src--");
    287. 

  287.         } else {
    288. 

  288.             printf("src -= %d", fromchans);
    289. 

  289.         }
    290. 

  290.         printf(", ");
    291. 

  291.         if (tochans == 1) {
    292. 

  292.             printf("dst--");
    293. 

  293.         } else {
    294. 

  294.             printf("dst -= %d", tochans);
    295. 

  295.         }
    296. 

  296.         printf(") {\n");
    297. 

  297.         fptr = cvtmatrix;
    298. 

  298.         for (i = 0; i < fromchans; i++) {
    299. 

  299.             if (input_channel_used[i] > 1) {  /* don't read it from src more than once. */
    300. 

  300.                 printf("        const float src%s = src[%d];\n", channel_names[fromchans-1][i], i);
    301. 

  301.             }
    302. 

  302.         }
    303. 

  303. 

  304.         for (j = tochans - 1; j >= 0; j--) {
    305. 

  305.             int has_input = 0;
    306. 

  306.             fptr = cvtmatrix + (fromchans * j);
    307. 

  307.             printf("        dst[%d] /* %s */ =", j, channel_names[tochans-1][j]);
    308. 

  308.             for (i = fromchans - 1; i >= 0; i--) {
    309. 

  309.                 const float coefficient = fptr[i];
    310. 

  310.                 char srcname[32];
    311. 

  311.                 if (coefficient == 0.0f) {
    312. 

  312.                     continue;
    313. 

  313.                 } else if (input_channel_used[i] > 1) {
    314. 

  314.                     snprintf(srcname, sizeof (srcname), "src%s", channel_names[fromchans-1][i]);
    315. 

  315.                 } else {
    316. 

  316.                     snprintf(srcname, sizeof (srcname), "src[%d]", i);
    317. 

  317.                 }
    318. 

  318. 

  319.                 if (has_input) {
    320. 

  320.                     printf(" +");
    321. 

  321.                 }
    322. 

  322. 

  323.                 has_input = 1;
    324. 

  324. 

  325.                 if (coefficient == 1.0f) {
    326. 

  326.                     printf(" %s", srcname);
    327. 

  327.                 } else {
    328. 

  328.                     printf(" (%s * %.9ff)", srcname, coefficient);
    329. 

  329.                 }
    330. 

  330.             }
    331. 

  331. 

  332.             if (!has_input) {
    333. 

  333.                 printf(" 0.0f");
    334. 

  334.             }
    335. 

  335. 

  336.             printf(";\n");
    337. 

  337.         }
    338. 

  338. 

  339.         printf("    }\n");
    340. 

  340.     } else {
    341. 

  341.         printf("    for (i = num_frames; i; i--, ");
    342. 

  342.         if (fromchans == 1) {
    343. 

  343.             printf("src++");
    344. 

  344.         } else {
    345. 

  345.             printf("src += %d", fromchans);
    346. 

  346.         }
    347. 

  347.         printf(", ");
    348. 

  348.         if (tochans == 1) {
    349. 

  349.             printf("dst++");
    350. 

  350.         } else {
    351. 

  351.             printf("dst += %d", tochans);
    352. 

  352.         }
    353. 

  353.         printf(") {\n");
    354. 

  354. 

  355.         fptr = cvtmatrix;
    356. 

  356.         for (i = 0; i < fromchans; i++) {
    357. 

  357.             if (input_channel_used[i] > 1) {  /* don't read it from src more than once. */
    358. 

  358.                 printf("        const float src%s = src[%d];\n", channel_names[fromchans-1][i], i);
    359. 

  359.             }
    360. 

  360.         }
    361. 

  361. 

  362.         for (j = 0; j < tochans; j++) {
    363. 

  363.             int has_input = 0;
    364. 

  364.             fptr = cvtmatrix + (fromchans * j);
    365. 

  365.             printf("        dst[%d] /* %s */ =", j, channel_names[tochans-1][j]);
    366. 

  366.             for (i = 0; i < fromchans; i++) {
    367. 

  367.                 const float coefficient = fptr[i];
    368. 

  368.                 char srcname[32];
    369. 

  369.                 if (coefficient == 0.0f) {
    370. 

  370.                     continue;
    371. 

  371.                 } else if (input_channel_used[i] > 1) {
    372. 

  372.                     snprintf(srcname, sizeof (srcname), "src%s", channel_names[fromchans-1][i]);
    373. 

  373.                 } else {
    374. 

  374.                     snprintf(srcname, sizeof (srcname), "src[%d]", i);
    375. 

  375.                 }
    376. 

  376. 

  377.                 if (has_input) {
    378. 

  378.                     printf(" +");
    379. 

  379.                 }
    380. 

  380. 

  381.                 has_input = 1;
    382. 

  382. 

  383.                 if (coefficient == 1.0f) {
    384. 

  384.                     printf(" %s", srcname);
    385. 

  385.                 } else {
    386. 

  386.                     printf(" (%s * %.9ff)", srcname, coefficient);
    387. 

  387.                 }
    388. 

  388.             }
    389. 

  389. 

  390.             if (!has_input) {
    391. 

  391.                 printf(" 0.0f");
    392. 

  392.             }
    393. 

  393. 

  394.             printf(";\n");
    395. 

  395.         }
    396. 

  396.         printf("    }\n");
    397. 

  397.     }
    398. 

  398. 

  399.     printf("\n}\n\n");
    400. 

  400. }
    401. 

  401. 

  402. int main(void)
    403. 

  403. {
    404. 

  404.     int ini, outi;
    405. 

  405. 

  406.     printf(
    407. 

  407.         "/*\n"
    408. 

  408.         "  Simple DirectMedia Layer\n"
    409. 

  409.         "  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>\n"
    410. 

  410.         "\n"
    411. 

  411.         "  This software is provided 'as-is', without any express or implied\n"
    412. 

  412.         "  warranty.  In no event will the authors be held liable for any damages\n"
    413. 

  413.         "  arising from the use of this software.\n"
    414. 

  414.         "\n"
    415. 

  415.         "  Permission is granted to anyone to use this software for any purpose,\n"
    416. 

  416.         "  including commercial applications, and to alter it and redistribute it\n"
    417. 

  417.         "  freely, subject to the following restrictions:\n"
    418. 

  418.         "\n"
    419. 

  419.         "  1. The origin of this software must not be misrepresented; you must not\n"
    420. 

  420.         "     claim that you wrote the original software. If you use this software\n"
    421. 

  421.         "     in a product, an acknowledgment in the product documentation would be\n"
    422. 

  422.         "     appreciated but is not required.\n"
    423. 

  423.         "  2. Altered source versions must be plainly marked as such, and must not be\n"
    424. 

  424.         "     misrepresented as being the original software.\n"
    425. 

  425.         "  3. This notice may not be removed or altered from any source distribution.\n"
    426. 

  426.         "*/\n"
    427. 

  427.         "\n"
    428. 

  428.         "// DO NOT EDIT, THIS FILE WAS GENERATED BY build-scripts/gen_audio_channel_conversion.c\n"
    429. 

  429.         "\n"
    430. 

  430.         "\n"
    431. 

  431.         "typedef void (*SDL_AudioChannelConverter)(float *dst, const float *src, int num_frames);\n"
    432. 

  432.         "\n"
    433. 

  433.     );
    434. 

  434. 

  435.     for (ini = 1; ini <= NUM_CHANNELS; ini++) {
    436. 

  436.         for (outi = 1; outi <= NUM_CHANNELS; outi++) {
    437. 

  437.             write_converter(ini, outi);
    438. 

  438.         }
    439. 

  439.     }
    440. 

  440. 

  441.     printf("static const SDL_AudioChannelConverter channel_converters[%d][%d] = {   /* [from][to] */\n", NUM_CHANNELS, NUM_CHANNELS);
    442. 

  442.     for (ini = 1; ini <= NUM_CHANNELS; ini++) {
    443. 

  443.         const char *comma = "";
    444. 

  444.         printf("    {");
    445. 

  445.         for (outi = 1; outi <= NUM_CHANNELS; outi++) {
    446. 

  446.             const char *fromstr = layout_names[ini-1];
    447. 

  447.             const char *tostr = layout_names[outi-1];
    448. 

  448.             if (ini == outi) {
    449. 

  449.                 printf("%s NULL", comma);
    450. 

  450.             } else {
    451. 

  451.                 printf("%s SDL_Convert%sTo%s", comma, remove_dots(fromstr), remove_dots(tostr));
    452. 

  452.             }
    453. 

  453.             comma = ",";
    454. 

  454.         }
    455. 

  455.         printf(" }%s\n", (ini == NUM_CHANNELS) ? "" : ",");
    456. 

  456.     }
    457. 

  457. 

  458.     printf("};\n\n");
    459. 

  459. 

  460.     return 0;
    461. 

  461. }
    462.