diff options
Diffstat (limited to 'lib/rbcodec/codecs/libopus/celt/entcode.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/celt/entcode.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/celt/entcode.c b/lib/rbcodec/codecs/libopus/celt/entcode.c index fa5d7c7c2c..461a36dd55 100644 --- a/lib/rbcodec/codecs/libopus/celt/entcode.c +++ b/lib/rbcodec/codecs/libopus/celt/entcode.c | |||
@@ -62,6 +62,27 @@ int ec_ilog(opus_uint32 _v){ | |||
62 | } | 62 | } |
63 | #endif | 63 | #endif |
64 | 64 | ||
65 | #if 1 | ||
66 | /* This is a faster version of ec_tell_frac() that takes advantage | ||
67 | of the low (1/8 bit) resolution to use just a linear function | ||
68 | followed by a lookup to determine the exact transition thresholds. */ | ||
69 | opus_uint32 ec_tell_frac(ec_ctx *_this){ | ||
70 | static const unsigned correction[8] = | ||
71 | {35733, 38967, 42495, 46340, | ||
72 | 50535, 55109, 60097, 65535}; | ||
73 | opus_uint32 nbits; | ||
74 | opus_uint32 r; | ||
75 | int l; | ||
76 | unsigned b; | ||
77 | nbits=_this->nbits_total<<BITRES; | ||
78 | l=EC_ILOG(_this->rng); | ||
79 | r=_this->rng>>(l-16); | ||
80 | b = (r>>12)-8; | ||
81 | b += r>correction[b]; | ||
82 | l = (l<<3)+b; | ||
83 | return nbits-l; | ||
84 | } | ||
85 | #else | ||
65 | opus_uint32 ec_tell_frac(ec_ctx *_this){ | 86 | opus_uint32 ec_tell_frac(ec_ctx *_this){ |
66 | opus_uint32 nbits; | 87 | opus_uint32 nbits; |
67 | opus_uint32 r; | 88 | opus_uint32 r; |
@@ -91,3 +112,42 @@ opus_uint32 ec_tell_frac(ec_ctx *_this){ | |||
91 | } | 112 | } |
92 | return nbits-l; | 113 | return nbits-l; |
93 | } | 114 | } |
115 | #endif | ||
116 | |||
117 | #ifdef USE_SMALL_DIV_TABLE | ||
118 | /* Result of 2^32/(2*i+1), except for i=0. */ | ||
119 | const opus_uint32 SMALL_DIV_TABLE[129] ICONST_ATTR = { | ||
120 | 0xFFFFFFFF, 0x55555555, 0x33333333, 0x24924924, | ||
121 | 0x1C71C71C, 0x1745D174, 0x13B13B13, 0x11111111, | ||
122 | 0x0F0F0F0F, 0x0D79435E, 0x0C30C30C, 0x0B21642C, | ||
123 | 0x0A3D70A3, 0x097B425E, 0x08D3DCB0, 0x08421084, | ||
124 | 0x07C1F07C, 0x07507507, 0x06EB3E45, 0x06906906, | ||
125 | 0x063E7063, 0x05F417D0, 0x05B05B05, 0x0572620A, | ||
126 | 0x05397829, 0x05050505, 0x04D4873E, 0x04A7904A, | ||
127 | 0x047DC11F, 0x0456C797, 0x04325C53, 0x04104104, | ||
128 | 0x03F03F03, 0x03D22635, 0x03B5CC0E, 0x039B0AD1, | ||
129 | 0x0381C0E0, 0x0369D036, 0x03531DEC, 0x033D91D2, | ||
130 | 0x0329161F, 0x03159721, 0x03030303, 0x02F14990, | ||
131 | 0x02E05C0B, 0x02D02D02, 0x02C0B02C, 0x02B1DA46, | ||
132 | 0x02A3A0FD, 0x0295FAD4, 0x0288DF0C, 0x027C4597, | ||
133 | 0x02702702, 0x02647C69, 0x02593F69, 0x024E6A17, | ||
134 | 0x0243F6F0, 0x0239E0D5, 0x02302302, 0x0226B902, | ||
135 | 0x021D9EAD, 0x0214D021, 0x020C49BA, 0x02040810, | ||
136 | 0x01FC07F0, 0x01F44659, 0x01ECC07B, 0x01E573AC, | ||
137 | 0x01DE5D6E, 0x01D77B65, 0x01D0CB58, 0x01CA4B30, | ||
138 | 0x01C3F8F0, 0x01BDD2B8, 0x01B7D6C3, 0x01B20364, | ||
139 | 0x01AC5701, 0x01A6D01A, 0x01A16D3F, 0x019C2D14, | ||
140 | 0x01970E4F, 0x01920FB4, 0x018D3018, 0x01886E5F, | ||
141 | 0x0183C977, 0x017F405F, 0x017AD220, 0x01767DCE, | ||
142 | 0x01724287, 0x016E1F76, 0x016A13CD, 0x01661EC6, | ||
143 | 0x01623FA7, 0x015E75BB, 0x015AC056, 0x01571ED3, | ||
144 | 0x01539094, 0x01501501, 0x014CAB88, 0x0149539E, | ||
145 | 0x01460CBC, 0x0142D662, 0x013FB013, 0x013C995A, | ||
146 | 0x013991C2, 0x013698DF, 0x0133AE45, 0x0130D190, | ||
147 | 0x012E025C, 0x012B404A, 0x01288B01, 0x0125E227, | ||
148 | 0x01234567, 0x0120B470, 0x011E2EF3, 0x011BB4A4, | ||
149 | 0x01194538, 0x0116E068, 0x011485F0, 0x0112358E, | ||
150 | 0x010FEF01, 0x010DB20A, 0x010B7E6E, 0x010953F3, | ||
151 | 0x01073260, 0x0105197F, 0x0103091B, 0x01010101 | ||
152 | }; | ||
153 | #endif | ||