包煎是什么意思

Line	Branch	Exec	Source
1			/*
2			* Block Gilbert-Moore decoder
3			* Copyright (c) 2010 Thilo Borgmann <thilo.borgmann _at_ mail.de>
4			*
5			* This file is part of FFmpeg.
6			*
7			* FFmpeg is free software; you can redistribute it and/or
8			* modify it under the terms of the GNU Lesser General Public
9			* License as published by the Free Software Foundation; either
10			* version 2.1 of the License, or (at your option) any later version.
11			*
12			* FFmpeg is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15			* Lesser General Public License for more details.
16			*
17			* You should have received a copy of the GNU Lesser General Public
18			* License along with FFmpeg; if not, write to the Free Software
19			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20			*/
21
22			/**
23			* @file
24			* Block Gilbert-Moore decoder as used by MPEG-4 ALS
25			* @author Thilo Borgmann <thilo.borgmann _at_ mail.de>
26			*/
27
28			#include "libavutil/attributes.h"
29			#include "libavutil/mem.h"
30			#include "bgmc.h"
31
32			#define FREQ_BITS 14 // bits used by frequency counters
33			#define VALUE_BITS 18 // bits used to represent the values
34			#define TOP_VALUE ((1 << VALUE_BITS) - 1) // maximum value
35			#define FIRST_QTR (TOP_VALUE / 4 + 1) // first quarter of values maximum value
36			#define HALF (2 * FIRST_QTR) // first half of values maximum value
37			#define THIRD_QTR (3 * FIRST_QTR) // third quarter of values maximum value
38
39			#define LUT_BITS (FREQ_BITS - 8) // number of bits used to index lookup tables
40			#define LUT_SIZE (1 << LUT_BITS) // size of the lookup tables
41			#define LUT_BUFF 4 // number of buffered lookup tables
42
43
44			/** Cumulative frequency tables for block Gilbert-Moore coding. */
45			static const uint16_t cf_tables_1[3][129] = {
46			{
47			16384, 16066, 15748, 15431, 15114, 14799, 14485, 14173, 13861, 13552,
48			13243, 12939, 12635, 12336, 12038, 11745, 11452, 11161, 10870, 10586,
49			10303, 10027, 9751, 9483, 9215, 8953, 8692, 8440, 8189, 7946,
50			7704, 7472, 7240, 7008, 6776, 6554, 6333, 6122, 5912, 5711,
51			5512, 5320, 5128, 4947, 4766, 4595, 4425, 4264, 4104, 3946,
52			3788, 3640, 3493, 3355, 3218, 3090, 2963, 2842, 2721, 2609,
53			2498, 2395, 2292, 2196, 2100, 2004, 1908, 1820, 1732, 1651,
54			1570, 1497, 1424, 1355, 1287, 1223, 1161, 1100, 1044, 988,
55			938, 888, 839, 790, 746, 702, 662, 623, 588, 553,
56			520, 488, 459, 431, 405, 380, 357, 334, 311, 288,
57			268, 248, 230, 213, 197, 182, 168, 154, 142, 130,
58			119, 108, 99, 90, 81, 72, 64, 56, 49, 42,
59			36, 30, 25, 20, 15, 11, 7, 3, 0
60			},
61			{
62			16384, 16080, 15776, 15473, 15170, 14868, 14567, 14268, 13970, 13674,
63			13378, 13086, 12794, 12505, 12218, 11936, 11654, 11373, 11092, 10818,
64			10544, 10276, 10008, 9749, 9490, 9236, 8982, 8737, 8492, 8256,
65			8020, 7792, 7564, 7336, 7108, 6888, 6669, 6459, 6249, 6050,
66			5852, 5660, 5468, 5286, 5104, 4931, 4760, 4598, 4436, 4275,
67			4115, 3965, 3816, 3674, 3534, 3403, 3272, 3147, 3023, 2907,
68			2792, 2684, 2577, 2476, 2375, 2274, 2173, 2079, 1986, 1897,
69			1810, 1724, 1645, 1567, 1493, 1419, 1351, 1284, 1222, 1161,
70			1105, 1050, 995, 941, 891, 842, 797, 753, 713, 673,
71			636, 599, 566, 533, 503, 473, 446, 419, 392, 365,
72			340, 316, 294, 272, 253, 234, 216, 199, 184, 169,
73			155, 142, 130, 118, 106, 95, 85, 75, 66, 57,
74			49, 41, 34, 27, 21, 15, 10, 5, 0
75			},
76			{
77			16384, 16092, 15801, 15510, 15219, 14930, 14641, 14355, 14069, 13785,
78			13501, 13219, 12938, 12661, 12384, 12112, 11841, 11571, 11301, 11037,
79			10773, 10514, 10256, 10005, 9754, 9508, 9263, 9025, 8787, 8557,
80			8327, 8103, 7879, 7655, 7431, 7215, 7000, 6792, 6585, 6387,
81			6190, 5998, 5807, 5625, 5445, 5272, 5100, 4937, 4774, 4613,
82			4452, 4301, 4150, 4007, 3865, 3731, 3597, 3469, 3341, 3218,
83			3099, 2981, 2869, 2758, 2652, 2546, 2440, 2334, 2234, 2134,
84			2041, 1949, 1864, 1779, 1699, 1620, 1547, 1474, 1407, 1340,
85			1278, 1217, 1157, 1097, 1043, 989, 940, 891, 846, 801,
86			759, 718, 680, 643, 609, 575, 543, 511, 479, 447,
87			418, 389, 363, 337, 314, 291, 270, 249, 230, 212,
88			195, 179, 164, 149, 135, 121, 108, 96, 85, 74,
89			64, 54, 45, 36, 28, 20, 13, 6, 0
90			}
91			};
92
93
94			static const uint16_t cf_tables_2[8][193] = {
95			{
96			16384, 16104, 15825, 15546, 15268, 14991, 14714, 14439, 14164, 13891,
97			13620, 13350, 13081, 12815, 12549, 12287, 12025, 11765, 11505, 11250,
98			10996, 10746, 10497, 10254, 10011, 9772, 9534, 9303, 9072, 8848,
99			8624, 8406, 8188, 7970, 7752, 7539, 7327, 7123, 6919, 6724,
100			6529, 6339, 6150, 5970, 5790, 5618, 5446, 5282, 5119, 4957,
101			4795, 4642, 4490, 4345, 4201, 4065, 3929, 3798, 3669, 3547,
102			3425, 3310, 3196, 3086, 2976, 2866, 2756, 2650, 2545, 2447,
103			2350, 2260, 2170, 2085, 2000, 1921, 1843, 1770, 1698, 1632,
104			1566, 1501, 1436, 1376, 1316, 1261, 1207, 1157, 1108, 1061,
105			1015, 973, 931, 893, 855, 819, 783, 747, 711, 677,
106			644, 614, 584, 557, 530, 505, 480, 458, 436, 416,
107			396, 378, 360, 343, 326, 310, 295, 281, 267, 255,
108			243, 232, 221, 211, 201, 192, 183, 174, 166, 158,
109			150, 142, 134, 126, 119, 112, 106, 100, 95, 90,
110			85, 80, 76, 72, 69, 66, 63, 60, 57, 54,
111			51, 48, 46, 44, 42, 40, 38, 36, 34, 33,
112			32, 31, 30, 29, 28, 27, 26, 25, 24, 23,
113			22, 21, 20, 19, 18, 17, 16, 15, 14, 13,
114			12, 11, 10, 9, 8, 7, 6, 5, 4, 3,
115			2, 1, 0
116			},
117			{
118			16384, 16116, 15849, 15582, 15316, 15050, 14785, 14521, 14257, 13995,
119			13734, 13476, 13218, 12963, 12708, 12457, 12206, 11956, 11706, 11460,
120			11215, 10975, 10735, 10500, 10265, 10034, 9803, 9579, 9355, 9136,
121			8917, 8703, 8489, 8275, 8061, 7853, 7645, 7444, 7244, 7051,
122			6858, 6671, 6484, 6305, 6127, 5956, 5785, 5622, 5459, 5298,
123			5137, 4983, 4830, 4684, 4539, 4401, 4263, 4131, 3999, 3874,
124			3750, 3632, 3515, 3401, 3287, 3173, 3059, 2949, 2840, 2737,
125			2635, 2539, 2444, 2354, 2264, 2181, 2098, 2020, 1943, 1872,
126			1801, 1731, 1661, 1596, 1532, 1472, 1412, 1357, 1303, 1251,
127			1200, 1153, 1106, 1063, 1020, 979, 938, 897, 856, 818,
128			780, 746, 712, 681, 650, 621, 592, 566, 540, 517,
129			494, 473, 452, 431, 410, 391, 373, 356, 340, 325,
130			310, 296, 282, 270, 258, 247, 236, 225, 214, 203,
131			192, 182, 172, 162, 153, 144, 136, 128, 121, 114,
132			108, 102, 97, 92, 87, 82, 77, 73, 69, 65,
133			62, 59, 56, 53, 50, 47, 45, 43, 41, 39,
134			37, 35, 33, 31, 29, 27, 26, 25, 24, 23,
135			22, 21, 20, 19, 18, 17, 16, 15, 14, 13,
136			12, 11, 10, 9, 8, 7, 6, 5, 4, 3,
137			2, 1, 0
138			},
139			{
140			16384, 16128, 15872, 15617, 15362, 15107, 14853, 14600, 14347, 14096,
141			13846, 13597, 13350, 13105, 12860, 12618, 12376, 12135, 11894, 11657,
142			11421, 11189, 10957, 10730, 10503, 10279, 10056, 9838, 9620, 9407,
143			9195, 8987, 8779, 8571, 8363, 8159, 7955, 7758, 7561, 7371,
144			7182, 6997, 6812, 6635, 6459, 6289, 6120, 5957, 5795, 5634,
145			5473, 5319, 5165, 5018, 4871, 4732, 4593, 4458, 4324, 4197,
146			4071, 3951, 3831, 3714, 3597, 3480, 3363, 3250, 3138, 3032,
147			2927, 2828, 2729, 2635, 2541, 2453, 2366, 2284, 2202, 2126,
148			2050, 1975, 1900, 1830, 1761, 1697, 1633, 1574, 1515, 1459,
149			1403, 1351, 1300, 1252, 1205, 1160, 1115, 1070, 1025, 982,
150			939, 899, 860, 824, 789, 756, 723, 693, 663, 636,
151			609, 584, 559, 535, 511, 489, 467, 447, 427, 409,
152			391, 374, 358, 343, 328, 313, 300, 287, 274, 261,
153			248, 235, 223, 211, 200, 189, 179, 169, 160, 151,
154			143, 135, 128, 121, 115, 109, 103, 97, 92, 87,
155			82, 77, 73, 69, 65, 61, 58, 55, 52, 49,
156			46, 43, 40, 37, 35, 33, 31, 29, 27, 25,
157			23, 21, 20, 19, 18, 17, 16, 15, 14, 13,
158			12, 11, 10, 9, 8, 7, 6, 5, 4, 3,
159			2, 1, 0
160			},
161			{
162			16384, 16139, 15894, 15649, 15405, 15162, 14919, 14677, 14435, 14195,
163			13955, 13717, 13479, 13243, 13008, 12775, 12542, 12310, 12079, 11851,
164			11623, 11399, 11176, 10956, 10737, 10521, 10305, 10094, 9883, 9677,
165			9471, 9268, 9065, 8862, 8659, 8459, 8260, 8067, 7874, 7688,
166			7502, 7321, 7140, 6965, 6790, 6621, 6452, 6290, 6128, 5968,
167			5808, 5655, 5503, 5356, 5209, 5069, 4929, 4794, 4660, 4532,
168			4404, 4282, 4160, 4041, 3922, 3803, 3684, 3568, 3452, 3343,
169			3234, 3131, 3029, 2931, 2833, 2741, 2649, 2563, 2477, 2396,
170			2316, 2236, 2157, 2083, 2009, 1940, 1871, 1807, 1743, 1683,
171			1623, 1567, 1511, 1459, 1407, 1357, 1307, 1257, 1207, 1159,
172			1111, 1067, 1023, 983, 943, 905, 868, 834, 800, 769,
173			738, 709, 681, 653, 625, 600, 575, 552, 529, 508,
174			487, 466, 447, 428, 410, 392, 376, 360, 344, 328,
175			313, 298, 283, 268, 255, 242, 230, 218, 207, 196,
176			186, 176, 167, 158, 150, 142, 135, 128, 121, 114,
177			108, 102, 97, 92, 87, 82, 78, 74, 70, 66,
178			62, 58, 54, 50, 47, 44, 41, 38, 35, 32,
179			30, 28, 26, 24, 22, 20, 18, 16, 14, 13,
180			12, 11, 10, 9, 8, 7, 6, 5, 4, 3,
181			2, 1, 0
182			},
183			{
184			16384, 16149, 15915, 15681, 15447, 15214, 14981, 14749, 14517, 14286,
185			14055, 13827, 13599, 13373, 13147, 12923, 12699, 12476, 12253, 12034,
186			11815, 11599, 11383, 11171, 10959, 10750, 10541, 10337, 10133, 9933,
187			9733, 9536, 9339, 9142, 8945, 8751, 8557, 8369, 8181, 7998,
188			7816, 7638, 7460, 7288, 7116, 6950, 6785, 6625, 6465, 6306,
189			6147, 5995, 5843, 5697, 5551, 5411, 5271, 5135, 5000, 4871,
190			4742, 4618, 4495, 4374, 4253, 4132, 4011, 3893, 3775, 3663,
191			3552, 3446, 3340, 3239, 3138, 3043, 2948, 2858, 2768, 2684,
192			2600, 2516, 2433, 2355, 2278, 2205, 2133, 2065, 1997, 1932,
193			1867, 1807, 1747, 1690, 1634, 1580, 1526, 1472, 1418, 1366,
194			1314, 1266, 1218, 1174, 1130, 1088, 1047, 1009, 971, 936,
195			901, 868, 836, 804, 772, 743, 714, 685, 658, 631,
196			606, 582, 559, 536, 515, 494, 475, 456, 437, 418,
197			399, 380, 362, 344, 328, 312, 297, 283, 270, 257,
198			245, 233, 222, 211, 201, 191, 181, 172, 163, 155,
199			147, 139, 132, 125, 119, 113, 107, 101, 96, 91,
200			86, 81, 76, 71, 66, 62, 58, 54, 50, 46,
201			43, 40, 37, 34, 31, 28, 26, 24, 22, 20,
202			18, 16, 14, 12, 10, 8, 6, 5, 4, 3,
203			2, 1, 0
204			},
205			{
206			16384, 16159, 15934, 15709, 15485, 15261, 15038, 14816, 14594, 14373,
207			14152, 13933, 13714, 13497, 13280, 13065, 12850, 12636, 12422, 12211,
208			12000, 11791, 11583, 11378, 11173, 10971, 10769, 10571, 10373, 10179,
209			9985, 9793, 9601, 9409, 9217, 9029, 8842, 8658, 8475, 8297,
210			8120, 7946, 7773, 7604, 7435, 7271, 7108, 6950, 6792, 6634,
211			6477, 6326, 6175, 6029, 5883, 5742, 5602, 5466, 5330, 5199,
212			5068, 4943, 4818, 4696, 4574, 4452, 4330, 4211, 4093, 3979,
213			3866, 3759, 3652, 3549, 3446, 3348, 3250, 3157, 3065, 2977,
214			2889, 2802, 2716, 2634, 2553, 2476, 2399, 2326, 2254, 2185,
215			2117, 2052, 1987, 1926, 1866, 1808, 1750, 1692, 1634, 1578,
216			1522, 1470, 1418, 1369, 1321, 1275, 1229, 1187, 1145, 1105,
217			1066, 1027, 991, 955, 919, 883, 850, 817, 786, 756,
218			728, 700, 674, 648, 624, 600, 578, 556, 534, 512,
219			490, 468, 447, 426, 407, 388, 371, 354, 338, 322,
220			307, 293, 280, 267, 255, 243, 231, 219, 209, 199,
221			189, 179, 170, 161, 153, 145, 138, 131, 124, 117,
222			111, 105, 99, 93, 87, 81, 76, 71, 66, 61,
223			57, 53, 49, 45, 42, 39, 36, 33, 30, 27,
224			24, 21, 19, 17, 15, 13, 11, 9, 7, 5,
225			3, 1, 0
226			},
227			{
228			16384, 16169, 15954, 15739, 15524, 15310, 15096, 14883, 14670, 14458,
229			14246, 14035, 13824, 13614, 13405, 13198, 12991, 12785, 12579, 12376,
230			12173, 11972, 11772, 11574, 11377, 11182, 10987, 10795, 10603, 10414,
231			10226, 10040, 9854, 9668, 9482, 9299, 9116, 8937, 8759, 8585,
232			8411, 8241, 8071, 7906, 7741, 7580, 7419, 7263, 7107, 6952,
233			6797, 6647, 6497, 6353, 6209, 6070, 5931, 5796, 5661, 5531,
234			5401, 5275, 5150, 5027, 4904, 4781, 4658, 4538, 4419, 4304,
235			4190, 4081, 3972, 3867, 3762, 3662, 3562, 3467, 3372, 3281,
236			3191, 3101, 3012, 2928, 2844, 2764, 2684, 2608, 2533, 2460,
237			2387, 2318, 2250, 2185, 2121, 2059, 1997, 1935, 1873, 1813,
238			1754, 1698, 1642, 1588, 1535, 1483, 1433, 1384, 1338, 1292,
239			1249, 1206, 1165, 1125, 1085, 1045, 1008, 971, 937, 903,
240			871, 840, 810, 780, 752, 724, 698, 672, 647, 622,
241			597, 572, 548, 524, 502, 480, 460, 440, 421, 403,
242			386, 369, 353, 337, 323, 309, 295, 281, 268, 255,
243			243, 231, 220, 209, 199, 189, 180, 171, 163, 155,
244			147, 139, 131, 123, 116, 109, 102, 95, 89, 83,
245			77, 72, 67, 62, 57, 52, 48, 44, 40, 36,
246			32, 28, 25, 22, 19, 16, 13, 10, 8, 6,
247			4, 2, 0
248			},
249			{
250			16384, 16177, 15970, 15764, 15558, 15353, 15148, 14944, 14740, 14537,
251			14334, 14132, 13930, 13729, 13529, 13330, 13131, 12933, 12735, 12539,
252			12343, 12150, 11957, 11766, 11576, 11388, 11200, 11015, 10830, 10647,
253			10465, 10285, 10105, 9925, 9745, 9568, 9391, 9218, 9045, 8876,
254			8707, 8541, 8375, 8213, 8051, 7894, 7737, 7583, 7429, 7277,
255			7125, 6977, 6830, 6687, 6544, 6406, 6268, 6133, 5998, 5868,
256			5738, 5612, 5487, 5364, 5241, 5118, 4995, 4875, 4755, 4640,
257			4525, 4414, 4304, 4198, 4092, 3990, 3888, 3790, 3693, 3600,
258			3507, 3415, 3323, 3235, 3147, 3064, 2981, 2902, 2823, 2746,
259			2670, 2594, 2522, 2450, 2382, 2314, 2248, 2182, 2116, 2050,
260			1987, 1924, 1864, 1804, 1748, 1692, 1638, 1585, 1534, 1484,
261			1437, 1390, 1346, 1302, 1258, 1215, 1174, 1133, 1095, 1057,
262			1021, 986, 952, 918, 887, 856, 827, 798, 770, 742,
263			714, 686, 659, 632, 607, 582, 559, 536, 514, 492,
264			472, 452, 433, 415, 398, 381, 364, 348, 333, 318,
265			304, 290, 277, 264, 252, 240, 229, 218, 208, 198,
266			188, 178, 168, 158, 149, 140, 132, 124, 116, 108,
267			101, 94, 87, 81, 75, 69, 64, 59, 54, 49,
268			44, 39, 35, 31, 27, 23, 19, 15, 12, 9,
269			6, 3, 0
270			}
271			};
272
273
274			static const uint16_t cf_tables_3[5][257] = {
275			{
276			16384, 16187, 15990, 15793, 15597, 15401, 15205, 15009, 14813, 14618,
277			14423, 14230, 14037, 13845, 13653, 13463, 13273, 13083, 12894, 12706,
278			12518, 12332, 12146, 11962, 11778, 11597, 11416, 11237, 11059, 10882,
279			10706, 10532, 10358, 10184, 10010, 9838, 9666, 9497, 9328, 9163,
280			8999, 8837, 8675, 8517, 8359, 8205, 8051, 7901, 7751, 7602,
281			7453, 7308, 7163, 7022, 6882, 6745, 6609, 6476, 6343, 6214,
282			6085, 5960, 5835, 5712, 5589, 5466, 5343, 5223, 5103, 4987,
283			4872, 4761, 4650, 4542, 4435, 4332, 4229, 4130, 4031, 3936,
284			3841, 3747, 3653, 3563, 3473, 3387, 3302, 3220, 3138, 3059,
285			2980, 2905, 2830, 2759, 2688, 2619, 2550, 2481, 2412, 2345,
286			2278, 2215, 2152, 2092, 2032, 1974, 1917, 1863, 1809, 1758,
287			1707, 1659, 1611, 1564, 1517, 1473, 1429, 1387, 1346, 1307,
288			1268, 1230, 1193, 1158, 1123, 1090, 1058, 1026, 994, 962,
289			930, 899, 869, 841, 813, 786, 760, 735, 710, 687,
290			664, 643, 622, 602, 582, 562, 543, 525, 507, 490,
291			473, 457, 442, 427, 412, 398, 385, 373, 361, 349,
292			337, 325, 313, 301, 290, 279, 269, 259, 249, 240,
293			231, 222, 214, 206, 199, 192, 185, 178, 171, 165,
294			159, 153, 148, 143, 138, 133, 128, 123, 119, 115,
295			111, 107, 103, 99, 95, 91, 87, 83, 80, 77,
296			74, 71, 68, 65, 63, 61, 59, 57, 55, 53,
297			51, 49, 47, 45, 43, 41, 40, 39, 38, 37,
298			36, 35, 34, 33, 32, 31, 30, 29, 28, 27,
299			26, 25, 24, 23, 22, 21, 20, 19, 18, 17,
300			16, 15, 14, 13, 12, 11, 10, 9, 8, 7,
301			6, 5, 4, 3, 2, 1, 0
302			},
303			{
304			16384, 16195, 16006, 15817, 15629, 15441, 15253, 15065, 14878, 14692,
305			14506, 14321, 14136, 13952, 13768, 13585, 13402, 13219, 13037, 12857,
306			12677, 12499, 12321, 12144, 11967, 11792, 11617, 11444, 11271, 11100,
307			10930, 10762, 10594, 10426, 10258, 10091, 9925, 9761, 9598, 9438,
308			9278, 9120, 8963, 8809, 8655, 8504, 8354, 8207, 8060, 7914,
309			7769, 7627, 7485, 7347, 7209, 7074, 6939, 6807, 6676, 6548,
310			6420, 6296, 6172, 6050, 5928, 5806, 5684, 5564, 5444, 5328,
311			5212, 5100, 4988, 4879, 4771, 4667, 4563, 4462, 4362, 4265,
312			4169, 4073, 3978, 3886, 3795, 3707, 3619, 3535, 3451, 3369,
313			3288, 3210, 3133, 3059, 2985, 2913, 2841, 2769, 2697, 2627,
314			2557, 2490, 2424, 2360, 2297, 2237, 2177, 2119, 2062, 2007,
315			1953, 1901, 1849, 1798, 1748, 1700, 1652, 1607, 1562, 1519,
316			1476, 1435, 1394, 1355, 1317, 1281, 1245, 1210, 1175, 1140,
317			1105, 1071, 1037, 1005, 973, 943, 913, 885, 857, 830,
318			804, 779, 754, 731, 708, 685, 663, 642, 621, 601,
319			581, 563, 545, 528, 511, 495, 479, 463, 448, 433,
320			419, 405, 391, 377, 364, 351, 338, 326, 314, 302,
321			291, 280, 270, 260, 251, 242, 234, 226, 218, 210,
322			202, 195, 188, 181, 174, 168, 162, 156, 150, 144,
323			139, 134, 129, 124, 119, 114, 109, 104, 100, 96,
324			92, 88, 84, 80, 77, 74, 71, 68, 65, 62,
325			59, 56, 54, 52, 50, 48, 46, 44, 42, 40,
326			38, 36, 34, 33, 32, 31, 30, 29, 28, 27,
327			26, 25, 24, 23, 22, 21, 20, 19, 18, 17,
328			16, 15, 14, 13, 12, 11, 10, 9, 8, 7,
329			6, 5, 4, 3, 2, 1, 0
330			},
331			{
332			16384, 16203, 16022, 15842, 15662, 15482, 15302, 15122, 14942, 14763,
333			14584, 14406, 14228, 14051, 13874, 13698, 13522, 13347, 13172, 12998,
334			12824, 12652, 12480, 12310, 12140, 11971, 11803, 11637, 11471, 11307,
335			11143, 10980, 10817, 10654, 10491, 10330, 10169, 10011, 9853, 9697,
336			9542, 9389, 9236, 9086, 8936, 8789, 8642, 8498, 8355, 8212,
337			8070, 7931, 7792, 7656, 7520, 7388, 7256, 7126, 6996, 6870,
338			6744, 6621, 6498, 6377, 6256, 6135, 6014, 5895, 5776, 5660,
339			5545, 5433, 5321, 5212, 5104, 4999, 4895, 4793, 4692, 4594,
340			4496, 4400, 4304, 4211, 4118, 4028, 3939, 3853, 3767, 3684,
341			3601, 3521, 3441, 3364, 3287, 3212, 3137, 3062, 2987, 2915,
342			2843, 2773, 2704, 2638, 2572, 2508, 2445, 2384, 2324, 2266,
343			2208, 2153, 2098, 2044, 1990, 1939, 1888, 1839, 1791, 1745,
344			1699, 1655, 1611, 1569, 1527, 1487, 1448, 1409, 1370, 1331,
345			1292, 1255, 1218, 1183, 1148, 1115, 1082, 1051, 1020, 990,
346			960, 932, 904, 878, 852, 826, 801, 777, 753, 731,
347			709, 687, 666, 645, 625, 605, 586, 567, 550, 533,
348			516, 499, 482, 465, 449, 433, 418, 403, 389, 375,
349			362, 349, 337, 325, 314, 303, 293, 283, 273, 263,
350			254, 245, 236, 227, 219, 211, 204, 197, 190, 183,
351			177, 171, 165, 159, 153, 147, 141, 135, 130, 125,
352			120, 115, 110, 105, 101, 97, 93, 89, 85, 81,
353			77, 74, 71, 68, 65, 62, 59, 56, 53, 51,
354			49, 47, 45, 43, 41, 39, 37, 35, 33, 31,
355			29, 27, 25, 23, 22, 21, 20, 19, 18, 17,
356			16, 15, 14, 13, 12, 11, 10, 9, 8, 7,
357			6, 5, 4, 3, 2, 1, 0
358			},
359			{
360			16384, 16210, 16036, 15863, 15690, 15517, 15344, 15172, 15000, 14828,
361			14656, 14485, 14314, 14145, 13976, 13808, 13640, 13472, 13304, 13137,
362			12970, 12804, 12639, 12475, 12312, 12149, 11987, 11827, 11667, 11508,
363			11349, 11192, 11035, 10878, 10721, 10565, 10410, 10257, 10104, 9953,
364			9802, 9654, 9506, 9359, 9213, 9070, 8927, 8787, 8647, 8508,
365			8369, 8233, 8097, 7964, 7831, 7700, 7570, 7442, 7315, 7190,
366			7065, 6943, 6821, 6701, 6581, 6461, 6341, 6223, 6105, 5990,
367			5876, 5764, 5653, 5545, 5437, 5331, 5226, 5124, 5022, 4924,
368			4826, 4729, 4632, 4538, 4444, 4353, 4262, 4174, 4087, 4002,
369			3917, 3835, 3753, 3674, 3595, 3518, 3441, 3364, 3287, 3212,
370			3138, 3066, 2995, 2926, 2858, 2792, 2726, 2662, 2599, 2538,
371			2478, 2420, 2362, 2305, 2249, 2195, 2141, 2089, 2037, 1988,
372			1939, 1891, 1844, 1799, 1754, 1711, 1668, 1626, 1584, 1542,
373			1500, 1459, 1418, 1380, 1342, 1305, 1269, 1234, 1199, 1166,
374			1133, 1102, 1071, 1041, 1012, 983, 954, 926, 899, 872,
375			847, 822, 798, 774, 751, 728, 707, 686, 666, 646,
376			627, 608, 589, 570, 552, 534, 517, 500, 484, 468,
377			453, 438, 424, 410, 397, 384, 372, 360, 348, 336,
378			325, 314, 303, 293, 283, 273, 264, 255, 246, 237,
379			229, 221, 213, 205, 197, 189, 181, 174, 167, 160,
380			154, 148, 142, 136, 131, 126, 121, 116, 111, 106,
381			101, 97, 93, 89, 85, 81, 77, 73, 70, 67,
382			64, 61, 58, 55, 52, 49, 46, 43, 40, 37,
383			35, 33, 31, 29, 27, 25, 23, 21, 19, 17,
384			16, 15, 14, 13, 12, 11, 10, 9, 8, 7,
385			6, 5, 4, 3, 2, 1, 0
386			},
387			{
388			16384, 16218, 16052, 15886, 15720, 15554, 15389, 15224, 15059, 14895,
389			14731, 14567, 14403, 14240, 14077, 13915, 13753, 13591, 13429, 13269,
390			13109, 12950, 12791, 12633, 12476, 12320, 12164, 12009, 11854, 11701,
391			11548, 11396, 11244, 11092, 10940, 10790, 10640, 10492, 10344, 10198,
392			10052, 9908, 9764, 9622, 9481, 9342, 9203, 9066, 8929, 8793,
393			8657, 8524, 8391, 8261, 8131, 8003, 7875, 7749, 7624, 7502,
394			7380, 7260, 7140, 7022, 6904, 6786, 6668, 6551, 6435, 6322,
395			6209, 6099, 5989, 5881, 5773, 5668, 5563, 5461, 5359, 5260,
396			5161, 5063, 4965, 4871, 4777, 4686, 4595, 4506, 4417, 4331,
397			4245, 4162, 4079, 3999, 3919, 3841, 3763, 3685, 3607, 3530,
398			3454, 3380, 3307, 3236, 3166, 3097, 3029, 2963, 2897, 2834,
399			2771, 2710, 2650, 2591, 2532, 2475, 2418, 2363, 2309, 2257,
400			2205, 2155, 2105, 2057, 2009, 1963, 1918, 1873, 1828, 1783,
401			1738, 1694, 1650, 1607, 1565, 1524, 1484, 1445, 1407, 1369,
402			1333, 1297, 1263, 1229, 1197, 1165, 1134, 1103, 1073, 1043,
403			1015, 987, 960, 933, 907, 882, 858, 834, 811, 788,
404			766, 744, 722, 700, 679, 658, 638, 618, 599, 581,
405			563, 545, 528, 511, 495, 480, 465, 451, 437, 423,
406			410, 397, 384, 372, 360, 348, 337, 326, 315, 305,
407			295, 285, 275, 265, 255, 245, 236, 227, 219, 211,
408			203, 195, 188, 181, 174, 167, 161, 155, 149, 143,
409			137, 131, 126, 121, 116, 111, 106, 101, 97, 93,
410			89, 85, 81, 77, 73, 69, 65, 61, 58, 55,
411			52, 49, 46, 43, 40, 37, 34, 32, 30, 28,
412			26, 24, 22, 20, 18, 16, 14, 12, 10, 8,
413			6, 5, 4, 3, 2, 1, 0
414			}
415			};
416
417
418			static const uint16_t *const cf_table[16] = {
419			cf_tables_1[0], cf_tables_1[1], cf_tables_1[2], cf_tables_2[0],
420			cf_tables_2[1], cf_tables_2[2], cf_tables_2[3], cf_tables_2[4],
421			cf_tables_2[5], cf_tables_2[6], cf_tables_2[7], cf_tables_3[0],
422			cf_tables_3[1], cf_tables_3[2], cf_tables_3[3], cf_tables_3[4]
423			};
424
425
426			/** Initialize a given lookup table using a given delta */
427		33	static void bgmc_lut_fillp(uint8_t *lut, int *lut_status, int delta)
428			{
429			unsigned int sx, i;
430
431	2/2 ✓ Branch 0 taken 528 times. ✓ Branch 1 taken 33 times.	561	for (sx = 0; sx < 16; sx++)
432	2/2 ✓ Branch 0 taken 33792 times. ✓ Branch 1 taken 528 times.	34320	for (i = 0; i < LUT_SIZE; i++) {
433		33792	unsigned int target = (i + 1) << (FREQ_BITS - LUT_BITS);
434		33792	unsigned int symbol = 1 << delta;
435
436	2/2 ✓ Branch 0 taken 179727 times. ✓ Branch 1 taken 33792 times.	213519	while (cf_table[sx][symbol] > target)
437		179727	symbol += 1 << delta;
438
439		33792	*lut++ = symbol >> delta;
440			}
441
442		33	*lut_status = delta;
443		33	}
444
445
446			/** Retune the index of a suitable lookup table for a given delta */
447		3148	static uint8_t *bgmc_lut_getp(uint8_t *lut, int *lut_status, int delta)
448			{
449		3148	unsigned int i = av_clip(delta, 0, LUT_BUFF - 1);
450
451		3148	lut += (i * LUT_SIZE) << 4;
452
453	2/2 ✓ Branch 0 taken 33 times. ✓ Branch 1 taken 3115 times.	3148	if (lut_status[i] != delta)
454		33	bgmc_lut_fillp(lut, &lut_status[i], delta);
455
456		3148	return lut;
457			}
458
459
460			/** Initialize the lookup table arrays */
461		4	av_cold int ff_bgmc_init(void *logctx,
462			uint8_t **cf_lut, int **cf_lut_status)
463			{
464		4	*cf_lut = av_malloc(sizeof(**cf_lut) * LUT_BUFF * 16 * LUT_SIZE);
465		4	*cf_lut_status = av_malloc(sizeof(**cf_lut_status) * LUT_BUFF);
466
467	2/4 ✓ Branch 0 taken 4 times. ✗ Branch 1 not taken. ✗ Branch 2 not taken. ✓ Branch 3 taken 4 times.	4	if (!*cf_lut || !*cf_lut_status) {
468		✗	ff_bgmc_end(cf_lut, cf_lut_status);
469		✗	av_log(logctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n");
470		✗	return AVERROR(ENOMEM);
471			} else {
472			// initialize lut_status buffer to a value never used to compare against
473		4	memset(*cf_lut_status, -1, sizeof(**cf_lut_status) * LUT_BUFF);
474			}
475
476		4	return 0;
477			}
478
479
480			/** Release the lookup table arrays */
481		14	av_cold void ff_bgmc_end(uint8_t **cf_lut, int **cf_lut_status)
482			{
483		14	av_freep(cf_lut);
484		14	av_freep(cf_lut_status);
485		14	}
486
487
488			/** Initialize decoding and reads the first value */
489		1722	int ff_bgmc_decode_init(GetBitContext *gb, unsigned int *h,
490			unsigned int *l, unsigned int *v)
491			{
492	1/2 ✗ Branch 1 not taken. ✓ Branch 2 taken 1722 times.	1722	if (get_bits_left(gb) < VALUE_BITS)
493		✗	return AVERROR_INVALIDDATA;
494
495		1722	*h = TOP_VALUE;
496		1722	*l = 0;
497		1722	*v = get_bits(gb, VALUE_BITS);
498
499		1722	return 0;
500			}
501
502
503			/** Finish decoding */
504		1722	void ff_bgmc_decode_end(GetBitContext *gb)
505			{
506		1722	skip_bits_long(gb, -(VALUE_BITS - 2));
507		1722	}
508
509
510			/** Read and decode a block Gilbert-Moore coded symbol */
511		3148	void ff_bgmc_decode(GetBitContext *gb, unsigned int num, int32_t *dst,
512			int delta, unsigned int sx,
513			unsigned int *h, unsigned int *l, unsigned int *v,
514			uint8_t *cf_lut, int *cf_lut_status)
515			{
516			unsigned int i;
517		3148	uint8_t *lut = bgmc_lut_getp(cf_lut, cf_lut_status, delta);
518
519			// read current state
520		3148	unsigned int high = *h;
521		3148	unsigned int low = *l;
522		3148	unsigned int value = *v;
523
524		3148	lut += sx * LUT_SIZE;
525
526			// decode num samples
527	2/2 ✓ Branch 0 taken 4580858 times. ✓ Branch 1 taken 3148 times.	4584006	for (i = 0; i < num; i++) {
528		4580858	unsigned int range = high - low + 1;
529		4580858	unsigned int target = (((value - low + 1) << FREQ_BITS) - 1) / range;
530		4580858	unsigned int symbol = lut[target >> (FREQ_BITS - LUT_BITS)] << delta;
531
532	2/2 ✓ Branch 0 taken 2228540 times. ✓ Branch 1 taken 4580858 times.	6809398	while (cf_table[sx][symbol] > target)
533		2228540	symbol += 1 << delta;
534
535		4580858	symbol = (symbol >> delta) - 1;
536
537		4580858	high = low + ((range * cf_table[sx][(symbol) << delta] - (1 << FREQ_BITS)) >> FREQ_BITS);
538		4580858	low = low + ((range * cf_table[sx][(symbol + 1) << delta]) >> FREQ_BITS);
539
540			while (1) {
541	2/2 ✓ Branch 0 taken 18189024 times. ✓ Branch 1 taken 9338050 times.	27527074	if (high >= HALF) {
542	2/2 ✓ Branch 0 taken 9362337 times. ✓ Branch 1 taken 8826687 times.	18189024	if (low >= HALF) {
543		9362337	value -= HALF;
544		9362337	low -= HALF;
545		9362337	high -= HALF;
546	4/4 ✓ Branch 0 taken 5975776 times. ✓ Branch 1 taken 2850911 times. ✓ Branch 2 taken 4245829 times. ✓ Branch 3 taken 1729947 times.	8826687	} else if (low >= FIRST_QTR && high < THIRD_QTR) {
547		4245829	value -= FIRST_QTR;
548		4245829	low -= FIRST_QTR;
549		4245829	high -= FIRST_QTR;
550			} else
551			break;
552			}
553
554		22946216	low *= 2;
555		22946216	high = 2 * high + 1;
556		22946216	value = 2 * value + get_bits1(gb);
557			}
558
559		4580858	*dst++ = symbol;
560			}
561
562			// save current state
563		3148	*h = high;
564		3148	*l = low;
565		3148	*v = value;
566		3148	}
567