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FFmpeg/libavcodec/ra288.c

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  1. /*

  2.  * RealAudio 2.0 (28.8K)

  3.  * Copyright (c) 2003 the ffmpeg project

  4.  *

  5.  * This library is free software; you can redistribute it and/or

  6.  * modify it under the terms of the GNU Lesser General Public

  7.  * License as published by the Free Software Foundation; either

  8.  * version 2 of the License, or (at your option) any later version.

  9.  *

  10.  * This library is distributed in the hope that it will be useful,

  11.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  13.  * Lesser General Public License for more details.

  14.  *

  15.  * You should have received a copy of the GNU Lesser General Public

  16.  * License along with this library; if not, write to the Free Software

  17.  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  18.  */

  19. 

  20. #include "avcodec.h"

  21.  

  22. typedef struct {

  23. 	float	history[8];

  24. 	float	output[40];

  25. 	float	pr1[36];

  26. 	float	pr2[10];

  27. 	int	phase, phasep;

  28. 

  29. 	float st1a[111],st1b[37],st1[37];

  30. 	float st2a[38],st2b[11],st2[11];

  31. 	float sb[41];

  32. 	float lhist[10];

  33. } Real288_internal;

  34. 

  35. const float amptable[8]={ 0.515625, 0.90234375, 1.57910156, 2.76342773,

  36.                          -0.515625,-0.90234375,-1.57910156,-2.76342773 };

  37. 

  38. const float codetable[640]={

  39. 	 0.326171875,	-1.4404296875,	-0.6123046875,	-0.8740234375,	-1.24658203125,

  40. 	-2.45703125,	-2.23486328125,	-0.51025390625,	 1.419921875,	 1.6201171875,

  41. 	-1.37646484375,	-1.30712890625,	-0.462890625,	-1.37939453125,	-2.1728515625,

  42. 	-3.26123046875,	-0.166015625,	 0.7236328125,	-0.623046875,	 0.6162109375,

  43. 	-0.2744140625,	-3.29931640625,	 0.62548828125,	 0.08740234375,	-0.6220703125,

  44. 	-1.2265625,	-3.4814453125,	-2.40478515625,	 3.37548828125,	 1.17724609375,

  45. 	-1.2099609375,	-0.076171875,	 2.28662109375,	-1.89111328125,	 0,

  46. 	-4.0078125,	 1.044921875,	-0.2333984375,	-1.35986328125,	 0.26025390625,

  47. 	 0.92236328125,	 1.34716796875,	 0.67431640625,	-3.39599609375,	-2.88720703125,

  48. 	 2.4814453125,	-1.201171875,	-2.8212890625,	 0.87744140625,	 0.27734375,

  49. 	-1.078125,	-1.61572265625,	-2.20849609375,	-3.044921875,	-3.66455078125,

  50. 	-1.32763671875,	 2.1279296875,	-1.458984375,	-0.56103515625,	 1.30078125,

  51. 	 0.61474609375,	 0.48583984375,	 1.32373046875,	-1.203125,	-5.0732421875,

  52. 	 0.8408203125,	-3.69580078125,	-1.3388671875,	 1.06005859375,	-1.13720703125,

  53. 	 0.50390625,	 0.36474609375,	-0.4189453125,	-3.8798828125,	-6.27099609375,

  54. 	 1.5166015625,	 2.37109375,	-2.04736328125,	-1.24072265625,	 0.50537109375,

  55. 	 0.9091796875,	-0.46875,	-3.236328125,	 0.2001953125,	 2.8720703125,

  56. 	-1.21728515625,	-1.283203125,	-1.953125,	-0.029296875,	 3.5166015625,

  57. 	-1.3046875,	 0.7060546875,	 0.75,		-1.87060546875,	 0.60205078125,

  58. 	-2.5888671875,	 3.375,		 0.77587890625,	-2.04443359375,	 1.78955078125,

  59. 	-1.6875,	-3.9892578125,	-3.76416015625,	 0.67578125,	 2.2939453125,

  60. 	-2.29443359375,	-3.03173828125,	-5.45703125,	 3.95703125,	 8.2177734375,

  61. 	 0.4541015625,	 3.419921875,	 0.61962890625,	-4.38330078125,	 1.25341796875,

  62. 	 2.27001953125,	 5.763671875,	 1.68017578125,	-2.76220703125,	 0.58544921875,

  63. 	 1.2412109375,	-0.08935546875,	-4.32568359375,	-3.89453125,	 1.5771484375,

  64. 	-1.40234375,	-0.98193359375,	-4.74267578125,	-4.09423828125,	 6.33935546875,

  65. 	 1.5068359375,	 1.044921875,	-1.796875,	-4.70849609375,	-1.4140625,

  66. 	-3.71533203125,	 3.18115234375,	-1.11474609375,	-1.2314453125,	 3.091796875,

  67. 	-1.62744140625,	-2.744140625,	-4.4580078125,	-5.43505859375,	 2.70654296875,

  68. 	-0.19873046875,	-3.28173828125,	-8.5283203125,	-1.41064453125,	 5.6484375,

  69. 	 1.802734375,	 3.318359375,	-0.1279296875,	-5.2958984375,	-0.90625,

  70. 	 3.55224609375,	 6.544921875,	-1.45947265625,	-5.17333984375,	 2.41015625,

  71. 	 0.119140625,	-1.08349609375,	 1.296875,	 1.84375,	-2.642578125,

  72. 	-1.97412109375,	-2.8974609375,	 1.04052734375,	 0.42138671875,	-1.3994140625,

  73. 	-1.6123046875,	 0.85107421875,	-0.9794921875,	-0.0625,	-1.001953125,

  74. 	-3.10595703125,	 1.6318359375,	-0.77294921875,	-0.01025390625,	 0.5576171875,

  75. 	-1.87353515625,	-0.89404296875,	 3.12353515625,	 1.24267578125,	-1.390625,

  76. 	-4.556640625,	-3.1875,	 2.59228515625,	 0.9697265625,	-1.09619140625,

  77. 	-2.1923828125,	 0.365234375,	 0.94482421875,	-1.47802734375,	-0.24072265625,

  78. 	-4.51904296875,	 2.6201171875,	 1.55908203125,	-2.19384765625,	 0.87109375,

  79. 	 2.3359375,	-0.1806640625,	 0.9111328125,	 0.51611328125,	-0.92236328125,

  80. 	 3.5849609375,	-1.3134765625,	-1.25830078125,	 0.330078125,	-0.29833984375,

  81. 	-0.2451171875,	 1.09130859375,	-0.9033203125,	-0.86767578125,	-1.00048828125,

  82. 	 0.49365234375,	 1.89453125,	-1.20361328125,	 1.07861328125,	-0.07421875,

  83. 	 1.265625,	 1.38134765625,	 2.728515625,	 1.38623046875,	-3.5673828125,

  84. 	-1.48876953125,	-2.4013671875,	 2.90771484375,	 4.49267578125,	-2.17138671875,

  85. 	 0.34033203125,	 1.908203125,	 2.8310546875,	-2.17333984375,	-2.267578125,

  86. 	-1.03564453125,	 2.658203125,	-1.2548828125,	 0.15673828125,	-0.5869140625,

  87. 	 1.3896484375,	-1.0185546875,	 1.724609375,	 0.2763671875,	-0.345703125,

  88. 	-2.08935546875,	 0.4638671875,	 2.431640625,	 1.83056640625,	 0.220703125,

  89. 	-1.212890625,	 1.7099609375,	 0.83935546875,	-0.0830078125,	 0.1162109375,

  90. 	-1.67724609375,	 0.12841796875,	 1.0322265625,	-0.97900390625,	 1.15283203125,

  91. 	-3.5830078125,	-0.58984375,	 4.56396484375,	-0.59375,	-1.95947265625,

  92. 	-6.5908203125,	-0.21435546875,	 3.919921875,	-2.06640625,	 0.17626953125,

  93. 	-1.82080078125,	 2.65283203125,	 0.978515625,	-2.30810546875,	-0.61474609375,

  94. 	-1.9462890625,	 3.78076171875,	 4.11572265625,	-1.80224609375,	-0.48193359375,

  95. 	 2.5380859375,	-0.20654296875,	 0.5615234375,	-0.62548828125,	 0.3984375,

  96. 	 3.61767578125,	 2.00634765625,	-1.92822265625,	 1.3134765625,	 0.0146484384313,

  97. 	 0.6083984375,	 1.49169921875,	-0.01708984375,	-0.6689453125,	-0.1201171875,

  98. 	-0.72705078125,	 2.75146484375,	-0.3310546875,	-1.28271484375,	 1.5478515625,

  99. 	 2.3583984375,	-2.23876953125,	 0.98046875,	-0.5185546875,	 0.39013671875,

  100. 	-0.06298828125,	 0.35009765625,	 2.2431640625,	 7.29345703125,	 5.2275390625,

  101. 	 0.20361328125,	 1.34716796875,	 0.9033203125,	-2.46923828125,	-0.56298828125,

  102. 	-1.89794921875,	 3.59423828125,	-2.81640625,	 2.09228515625,	 0.3251953125,

  103. 	 0.70458984375,	-0.4580078125,	 0.009765625,	-1.03466796875,	-0.82861328125,

  104. 	-1.8125,	-1.6611328125,	-1.080078125,	 0.0537109375,	 1.04296875,

  105. 	-1.44140625,	 0.005859375,	-0.765625,	-1.708984375,	-0.90576171875,

  106. 	-0.64208984375,	-0.84521484375,	 0.56640625,	-0.2724609375,	 0.83447265625,

  107. 	 0.04296875,	-2.23095703125,	 0.0947265625,	-0.2216796875,	-1.44384765625,

  108. 	-1.38623046875,	-0.8134765625,	-0.13330078125,	 1.017578125,	-0.07568359375,

  109. 	-0.09228515625,	-1.16015625,	 0.81201171875,	-0.5078125,	-1.19580078125,

  110. 	-1.3876953125,	-0.66845703125,	 0.310546875,	-0.12109375,	-1.30712890625,

  111. 	 0.74072265625,	 0.03857421875,	-1.47119140625,	-1.79150390625,	-0.47509765625,

  112. 	 0.93408203125,	-1.21728515625,	-2.59375,	-0.36572265625,	 0.62060546875,

  113. 	-1.41748046875,	-1.623046875,	-1.833984375,	-1.8017578125,	-0.89306640625,

  114. 	-1.42236328125,	-0.75537109375,	-1.34765625,	-0.6865234375,	 0.548828125,

  115. 	 0.900390625,	-0.8955078125,	 0.22265625,	 0.3447265625,	-2.0859375,

  116. 	 0.22802734375,	-2.078125,	-0.93212890625,	 0.74267578125,	 0.5537109375,

  117. 	-0.06201171875,	-0.4853515625,	-0.31103515625,	-0.72802734375,	-3.1708984375,

  118. 	 0.42626953125,	-0.99853515625,	-1.869140625,	-1.36328125,	-0.2822265625,

  119. 	 1.12841796875,	-0.88720703125,	 1.28515625,	-1.490234375,	 0.9609375,

  120. 	 0.31298828125,	 0.5830078125,	 0.92431640625,	 2.00537109375,	 3.0966796875,

  121. 	-0.02197265625,	 0.5849609375,	 1.0546875,	-0.70751953125,	 1.07568359375,

  122. 	-0.978515625,	 0.83642578125,	 1.7177734375,	 1.294921875,	 2.07568359375,

  123. 	 1.43359375,	-1.9375,	 0.625,		 0.06396484375,	-0.720703125,

  124. 	 1.38037109375,	 0.00390625,	-0.94140625,	 1.2978515625,	 1.71533203125,

  125. 	 1.56201171875,	-0.3984375,	 1.31201171875,	-0.85009765625,	-0.68701171875,

  126. 	 1.439453125,	 1.96728515625,	 0.1923828125,	-0.12353515625,	 0.6337890625,

  127. 	 2.0927734375,	 0.02490234375,	-2.20068359375,	-0.015625,	-0.32177734375,

  128. 	 1.90576171875,	 2.7568359375,	-2.728515625,	-1.265625,	 2.78662109375,

  129. 	-0.2958984375,	 0.6025390625,	-0.78466796875,	-2.53271484375,	 0.32421875,

  130. 	-0.25634765625,	 1.767578125,	-1.0703125,	-1.23388671875,	 0.83349609375,

  131. 	 2.09814453125,	-1.58740234375,	-1.11474609375,	 0.396484375,	-1.10546875,

  132. 	 2.81494140625,	 0.2578125,	-1.60498046875,	 0.66015625,	 0.81640625,

  133. 	 1.33544921875,	 0.60595703125,	-0.53857421875,	-1.59814453125,	-1.66357421875,

  134. 	 1.96923828125,	 0.8046875,	-1.44775390625,	-0.5732421875,	 0.705078125,

  135. 	 0.0361328125,	 0.4482421875,	 0.97607421875,	 0.44677734375,	-0.5009765625,

  136. 	-1.21875,	-0.78369140625,	 0.9931640625,	 1.4404296875,	 0.11181640625,

  137. 	-1.05859375,	 0.99462890625,	 0.00732421921566,-0.6171875,	-0.1015625,

  138. 	-1.734375,	 0.7470703125,	 0.28369140625,	 0.72802734375,	 0.4697265625,

  139. 	-1.27587890625,	-1.1416015625,	 1.76806640625,	-0.7265625,	-1.06689453125,

  140. 	-0.85302734375,	 0.03955078125,	 2.7041015625,	 0.69921875,	-1.10205078125,

  141. 	-0.49755859375,	 0.42333984375,	 0.1044921875,	-1.115234375,	-0.7373046875,

  142. 	-0.822265625,	 1.375,		-0.11181640625,	 1.24560546875,	-0.67822265625,

  143. 	 1.32177734375,	 0.24609375,	 0.23388671875,	 1.35888671875,	-0.49267578125,

  144. 	 1.22900390625,	-0.72607421875,	-0.779296875,	 0.30322265625,	 0.94189453125,

  145. 	-0.072265625,	 1.0771484375,	-2.09375,	 0.630859375,	-0.68408203125,

  146. 	-0.25732421875,	 0.60693359375,	-1.33349609375,	 0.93212890625,	 0.625,

  147. 	 1.04931640625,	-0.73291015625,	 1.80078125,	 0.2978515625,	-2.24169921875,

  148. 	 1.6142578125,	-1.64501953125,	 0.91552734375,	 1.775390625,	-0.59423828125,

  149. 	 1.2568359375,	 1.22705078125,	 0.70751953125,	-1.5009765625,	-2.43115234375,

  150. 	 0.3974609375,	 0.8916015625,	-1.21923828125,	 2.0673828125,	-1.99072265625,

  151. 	 0.8125,	-0.107421875,	 1.6689453125,	 0.4892578125,	 0.54443359375,

  152. 	 0.38134765625,	 0.8095703125,	 1.91357421875,	 2.9931640625,	 1.533203125,

  153. 	 0.560546875,	 1.98486328125,	 0.740234375,	 0.39794921875,	 0.09716796875,

  154. 	 0.58154296875,	 1.21533203125,	 1.25048828125,	 1.18212890625,	 1.19287109375,

  155. 	 0.3759765625,	-2.88818359375,	 2.69287109375,	-0.1796875,	-1.56201171875,

  156. 	 0.5810546875,	 0.51123046875,	 1.8271484375,	 3.38232421875,	-1.02001953125,

  157. 	 0.142578125,	 1.51318359375,	 2.103515625,	-0.3701171875,	-1.19873046875,

  158. 	 0.25537109375,	 1.91455078125,	 1.974609375,	 0.6767578125,	 0.04150390625,

  159. 	 2.13232421875,	 0.4912109375,	-0.611328125,	-0.7158203125,	-0.67529296875,

  160. 	 1.880859375,	 0.77099609375,	-0.03759765625,	 1.0078125,	 0.423828125,

  161. 	 2.49462890625,	 1.42529296875,	-0.0986328125,	 0.17529296875,	-0.24853515625,

  162. 	 1.7822265625,	 1.5654296875,	 1.12451171875,	 0.82666015625,	 0.6328125,

  163. 	 1.41845703125,	-1.90771484375,	 0.11181640625,	-0.583984375,	-1.138671875,

  164. 	 2.91845703125,	-1.75048828125,	 0.39306640625,	 1.86767578125,	-1.5322265625,

  165. 	 1.8291015625,	-0.2958984375,	 0.02587890625,	-0.13134765625,	-1.61181640625,

  166. 	 0.2958984375,	 0.9853515625,	-0.642578125,	 1.984375,	 0.1943359375

  167. };

  168. 

  169. const float table1[111]={

  170. 	0.576690972,	0.580838025,	0.585013986,	0.589219987,	0.59345597,	0.597723007,

  171. 	0.602020264,	0.606384277,	0.610748291,	0.615142822,	0.619598389,	0.624084473,

  172. 	0.628570557,	0.633117676,	0.637695313,	0.642272949,	0.646911621,	0.651580811,

  173. 	0.656280518,	0.66104126,	0.665802002,	0.670593262,	0.675445557,	0.680328369,

  174. 	0.685241699,	0.690185547,	0.695159912,	0.700164795,	0.705230713,	0.710327148,

  175. 	0.715454102,	0.720611572,	0.725830078,	0.731048584,	0.736328125,	0.741638184,

  176. 	0.747009277,	0.752380371,	0.7578125,	0.763305664,	0.768798828,	0.774353027,

  177. 	0.779937744,	0.785583496,	0.791229248,	0.796936035,	0.802703857,	0.808502197,

  178. 	0.814331055,	0.820220947,	0.826141357,	0.832092285,	0.838104248,	0.844146729,

  179. 	0.850250244,	0.856384277,	0.862548828,	0.868774414,	0.875061035,	0.881378174,

  180. 	0.88772583,	0.894134521,	0.900604248,	0.907104492,	0.913635254,	0.920227051,

  181. 	0.926879883,	0.933563232,	0.940307617,	0.94708252,	0.953918457,	0.96081543,

  182. 	0.96774292,	0.974731445,	0.981781006,	0.988861084,	0.994842529,	0.998565674,

  183. 	0.999969482,	0.99911499,	0.996002197,	0.990600586,	0.982910156,	0.973022461,

  184. 	0.960876465,	0.946533203,	0.930053711,	0.911437988,	0.89074707,	0.868041992,

  185. 	0.843322754,	0.816680908,	0.788208008,	0.757904053,	0.725891113,	0.692199707,

  186. 	0.656921387,	0.620178223,	0.582000732,	0.542480469,	0.501739502,	0.459838867,

  187. 	0.416900635,	0.373016357,	0.328277588,	0.282775879,	0.236663818,	0.189971924,

  188. 	0.142852783,	0.0954284668,	0.0477600098

  189. };

  190. 

  191. const float table2[38]={

  192. 	0.505699992,	0.524200022,	0.54339999,	0.563300014,	0.583953857,	0.60534668,

  193. 	0.627502441,	0.650482178,	0.674316406,	0.699005127,	0.724578857,	0.75112915,

  194. 	0.778625488,	0.807128906,	0.836669922,	0.86730957,	0.899078369,	0.932006836,

  195. 	0.961486816,	0.982757568,	0.995635986,	1,		0.995819092,	0.983154297,

  196. 	0.96206665,	0.932769775,	0.895507813,	0.850585938,	0.798400879,	0.739379883,

  197. 	0.674072266,	0.602996826,	0.526763916,	0.446014404,	0.361480713,	0.273834229,

  198. 	0.183868408,	0.0923461914

  199. };

  200. 

  201. const float table1a[36]={

  202. 	0.98828125,	0.976699829,	0.965254128,	0.953942537,	0.942763507,	0.931715488,

  203. 	0.920796931,	0.910006344,	0.899342179,	0.888803005,	0.878387332,	0.868093729,

  204. 	0.857920766,	0.847867012,	0.837931097,	0.828111589,	0.818407178,	0.808816493,

  205. 	0.799338162,	0.789970934,	0.780713439,	0.771564424,	0.762522638,	0.753586829,

  206. 	0.744755745,	0.736028135,	0.727402806,	0.718878567,	0.710454226,	0.702128589,

  207. 	0.693900526,	0.685768902,	0.677732527,	0.669790328,	0.66194123,	0.654184103

  208. };

  209. 

  210. const float table2a[10]={

  211. 	0.90625,	0.821289063,	0.74432373,	0.674499512,	0.61126709,

  212. 	0.553955078,	0.50201416,	0.454956055,	0.41229248,	0.373657227

  213. };

  214. 

  215. 

  216. static int ra288_decode_init(AVCodecContext * avctx)

  217. {

  218. 	Real288_internal *glob=avctx->priv_data;

  219. 	memset(glob,0,sizeof(Real288_internal));

  220. 	return 0;

  221. }

  222. 

  223. static void prodsum(float *tgt, float *src, int len, int n);

  224. static void co(int n, int i, int j, float *in, float *out, float *st1, float *st2, const float *table);

  225. static int pred(float *in, float *tgt, int n);

  226. static void colmult(float *tgt, float *m1, const float *m2, int n);

  227. 

  228. 

  229. /* initial decode */

  230. static void unpack(unsigned short *tgt, unsigned char *src, int len)

  231. {

  232.   int x,y,z;

  233.   int n,temp;

  234.   int buffer[len];

  235. 

  236.   for (x=0;x<len;tgt[x++]=0)

  237.     buffer[x]=9+(x&1);

  238. 

  239.   for (x=y=z=0;x<len/*was 38*/;x++) {

  240.     n=buffer[y]-z;

  241.     temp=src[x];

  242.     if (n<8) temp&=255>>(8-n);

  243.     tgt[y]+=temp<<z;

  244.     if (n<=8) {

  245.       tgt[++y]+=src[x]>>n;

  246.       z=8-n;

  247.     } else z+=8;

  248.   }

  249. }

  250. 

  251. static void update(Real288_internal *glob)

  252. {

  253.   int x,y;

  254.   float buffer1[40],temp1[37];

  255.   float buffer2[8],temp2[11];

  256. 

  257.   for (x=0,y=glob->phasep+5;x<40;buffer1[x++]=glob->output[(y++)%40]);

  258.   co(36,40,35,buffer1,temp1,glob->st1a,glob->st1b,table1);

  259.   if (pred(temp1,glob->st1,36))

  260.     colmult(glob->pr1,glob->st1,table1a,36);

  261. 

  262.   for (x=0,y=glob->phase+1;x<8;buffer2[x++]=glob->history[(y++)%8]);

  263.   co(10,8,20,buffer2,temp2,glob->st2a,glob->st2b,table2);

  264.   if (pred(temp2,glob->st2,10))

  265.     colmult(glob->pr2,glob->st2,table2a,10);

  266. }

  267. 

  268. /* Decode and produce output */

  269. static void decode(Real288_internal *glob, unsigned int input)

  270. {

  271.   unsigned int x,y;

  272.   float f;

  273.   double sum,sumsum;

  274.   float *p1,*p2;

  275.   float buffer[5];

  276.   const float *table;

  277. 

  278.   for (x=36;x--;glob->sb[x+5]=glob->sb[x]);

  279.   for (x=5;x--;) {

  280.     p1=glob->sb+x;p2=glob->pr1;

  281.     for (sum=0,y=36;y--;sum-=(*(++p1))*(*(p2++)));

  282.     glob->sb[x]=sum;

  283.   }

  284. 

  285.   f=amptable[input&7];

  286.   table=codetable+(input>>3)*5;

  287. 

  288.   /* convert log and do rms */

  289.   for (sum=32,x=10;x--;sum-=glob->pr2[x]*glob->lhist[x]);

  290.   if (sum<0) sum=0; else if (sum>60) sum=60;

  291. 

  292.   sumsum=exp(sum*0.1151292546497)*f;	/* pow(10.0,sum/20)*f */

  293.   for (sum=0,x=5;x--;) { buffer[x]=table[x]*sumsum; sum+=buffer[x]*buffer[x]; }

  294.   if ((sum/=5)<1) sum=1;

  295. 

  296.   /* shift and store */

  297.   for (x=10;--x;glob->lhist[x]=glob->lhist[x-1]);

  298.   *glob->lhist=glob->history[glob->phase]=10*log10(sum)-32;

  299. 

  300.   for (x=1;x<5;x++) for (y=x;y--;buffer[x]-=glob->pr1[x-y-1]*buffer[y]);

  301. 

  302.   /* output */

  303.   for (x=0;x<5;x++) {

  304.     f=glob->sb[4-x]+buffer[x];

  305.     if (f>4095) f=4095; else if (f<-4095) f=-4095;

  306.     glob->output[glob->phasep+x]=glob->sb[4-x]=f;

  307.   }

  308. }

  309. 

  310. /* column multiply */

  311. static void colmult(float *tgt, float *m1, const float *m2, int n)

  312. {

  313.   while (n--)

  314.     *(tgt++)=(*(m1++))*(*(m2++));

  315. }

  316. 

  317. static int pred(float *in, float *tgt, int n)

  318. {

  319.   int x,y;

  320.   float *p1,*p2;

  321.   double f0,f1,f2;

  322.   float temp;

  323. 

  324.   if (in[n]==0) return 0;

  325.   if ((f0=*in)<=0) return 0;

  326. 

  327.   for (x=1;;x++) {

  328.     if (n<x) return 1;

  329. 

  330.     p1=in+x;

  331.     p2=tgt;

  332.     f1=*(p1--);

  333.     for (y=x;--y;f1+=(*(p1--))*(*(p2++)));

  334. 

  335.     p1=tgt+x-1;

  336.     p2=tgt;

  337.     *(p1--)=f2=-f1/f0;

  338.     for (y=x>>1;y--;) {

  339.       temp=*p2+*p1*f2;

  340.       *(p1--)+=*p2*f2;

  341.       *(p2++)=temp;

  342.     }

  343.     if ((f0+=f1*f2)<0) return 0;

  344.   }

  345. }

  346. 

  347. static void co(int n, int i, int j, float *in, float *out, float *st1, float *st2, const float *table)

  348. {

  349.   int a,b,c;

  350.   unsigned int x;

  351.   float *fp,*fp2;

  352.   float buffer1[37];

  353.   float buffer2[37];

  354.   float work[111];

  355. 

  356.   /* rotate and multiply */

  357.   c=(b=(a=n+i)+j)-i;

  358.   fp=st1+i;

  359.   for (x=0;x<b;x++) {

  360.     if (x==c) fp=in;

  361.     work[x]=*(table++)*(*(st1++)=*(fp++));

  362.   }

  363.   

  364.   prodsum(buffer1,work+n,i,n);

  365.   prodsum(buffer2,work+a,j,n);

  366. 

  367.   for (x=0;x<=n;x++) {

  368.     *st2=*st2*(0.5625)+buffer1[x];

  369.     out[x]=*(st2++)+buffer2[x];

  370.   }

  371.   *out*=1.00390625; /* to prevent clipping */

  372. }

  373. 

  374. /* product sum (lsf) */

  375. static void prodsum(float *tgt, float *src, int len, int n)

  376. {

  377.   unsigned int x;

  378.   float *p1,*p2;

  379.   double sum;

  380. 

  381.   while (n>=0)

  382.   {

  383.     p1=(p2=src)-n;

  384.     for (sum=0,x=len;x--;sum+=(*p1++)*(*p2++));

  385.     tgt[n--]=sum;

  386.   }

  387. }

  388. 

  389. void * decode_block(AVCodecContext * avctx, unsigned char *in, signed short int *out,unsigned len)

  390. {

  391.   int x,y;

  392.   Real288_internal *glob=avctx->priv_data;

  393.   unsigned short int buffer[len];

  394. 

  395.   unpack(buffer,in,len);

  396.   for (x=0;x<32;x++)

  397.   {

  398.     glob->phasep=(glob->phase=x&7)*5;

  399.     decode(glob,buffer[x]);

  400.     for (y=0;y<5;*(out++)=8*glob->output[glob->phasep+(y++)]);

  401.     if (glob->phase==3) update(glob);

  402.   }

  403.   return out;

  404. }

  405. 

  406. /* Decode a block (celp) */

  407. static int ra288_decode_frame(AVCodecContext * avctx,

  408.             void *data, int *data_size,

  409.             uint8_t * buf, int buf_size)

  410. {

  411.   if(avctx->extradata_size>=6)

  412.   {

  413. //((short*)(avctx->extradata))[0]; /* subpacket size */

  414. //((short*)(avctx->extradata))[1]; /* subpacket height */

  415. //((short*)(avctx->extradata))[2]; /* subpacket flavour */

  416. //((short*)(avctx->extradata))[3]; /* coded frame size */

  417. //((short*)(avctx->extradata))[4]; /* codec's data length  */

  418. //((short*)(avctx->extradata))[5...] /* codec's data */

  419.     int bret;

  420.     void *datao;

  421.     int w=avctx->block_align; /* 228 */

  422.     int h=((short*)(avctx->extradata))[1]; /* 12 */

  423.     int cfs=((short*)(avctx->extradata))[3]; /* coded frame size 38 */

  424.     int i,j;

  425.     if(buf_size<w*h)

  426.     {

  427. 	fprintf(stderr,"ffra288: Error! Input buffer is too small [%d<%d]\n",buf_size,w*h);

  428. 	return 0;

  429.     }

  430.     datao = data;

  431.     bret = 0;

  432.     for (j = 0; j < h/2; j++)

  433. 	for (i = 0; i < h; i++)

  434.     {

  435. 	    data=decode_block(avctx,&buf[j*cfs+cfs*i*h/2],(signed short *)data,cfs);

  436. 	    bret += cfs;

  437.     }

  438.     *data_size = data - datao;

  439.     return bret;

  440.   }

  441.   else

  442.   {

  443.     fprintf(stderr,"ffra288: Error: need extra data!!!\n");

  444.     return 0;

  445.   }

  446. }

  447. 

  448. AVCodec ra_288_decoder =

  449. {

  450.     "real_288",

  451.     CODEC_TYPE_AUDIO,

  452.     CODEC_ID_RA_288,

  453.     sizeof(Real288_internal),

  454.     ra288_decode_init,

  455.     NULL,

  456.     NULL,

  457.     ra288_decode_frame,

  458. };