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Diffstat (limited to 'lib/rbcodec/codecs/libspeex/lpc_bfin.h')
-rw-r--r-- | lib/rbcodec/codecs/libspeex/lpc_bfin.h | 131 |
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diff --git a/lib/rbcodec/codecs/libspeex/lpc_bfin.h b/lib/rbcodec/codecs/libspeex/lpc_bfin.h new file mode 100644 index 0000000000..7310ffba52 --- /dev/null +++ b/lib/rbcodec/codecs/libspeex/lpc_bfin.h | |||
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1 | /* Copyright (C) 2005 Analog Devices */ | ||
2 | /** | ||
3 | @file lpc_bfin.h | ||
4 | @author Jean-Marc Valin | ||
5 | @brief Functions for LPC (Linear Prediction Coefficients) analysis (Blackfin version) | ||
6 | */ | ||
7 | /* | ||
8 | Redistribution and use in source and binary forms, with or without | ||
9 | modification, are permitted provided that the following conditions | ||
10 | are met: | ||
11 | |||
12 | - Redistributions of source code must retain the above copyright | ||
13 | notice, this list of conditions and the following disclaimer. | ||
14 | |||
15 | - Redistributions in binary form must reproduce the above copyright | ||
16 | notice, this list of conditions and the following disclaimer in the | ||
17 | documentation and/or other materials provided with the distribution. | ||
18 | |||
19 | - Neither the name of the Xiph.org Foundation nor the names of its | ||
20 | contributors may be used to endorse or promote products derived from | ||
21 | this software without specific prior written permission. | ||
22 | |||
23 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
24 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
25 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
26 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR | ||
27 | CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | ||
28 | EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | ||
29 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | ||
30 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | ||
31 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | ||
32 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | ||
33 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
34 | */ | ||
35 | |||
36 | #define OVERRIDE_SPEEX_AUTOCORR | ||
37 | void _spx_autocorr( | ||
38 | const spx_word16_t *x, /* in: [0...n-1] samples x */ | ||
39 | spx_word16_t *ac, /* out: [0...lag-1] ac values */ | ||
40 | int lag, | ||
41 | int n | ||
42 | ) | ||
43 | { | ||
44 | spx_word32_t d; | ||
45 | const spx_word16_t *xs; | ||
46 | int i, j; | ||
47 | spx_word32_t ac0=1; | ||
48 | spx_word32_t ac32[11], *ac32top; | ||
49 | int shift, ac_shift; | ||
50 | ac32top = ac32+lag-1; | ||
51 | int lag_1, N_lag; | ||
52 | int nshift; | ||
53 | lag_1 = lag-1; | ||
54 | N_lag = n-lag_1; | ||
55 | for (j=0;j<n;j++) | ||
56 | ac0 = ADD32(ac0,SHR32(MULT16_16(x[j],x[j]),8)); | ||
57 | ac0 = ADD32(ac0,n); | ||
58 | shift = 8; | ||
59 | while (shift && ac0<0x40000000) | ||
60 | { | ||
61 | shift--; | ||
62 | ac0 <<= 1; | ||
63 | } | ||
64 | ac_shift = 18; | ||
65 | while (ac_shift && ac0<0x40000000) | ||
66 | { | ||
67 | ac_shift--; | ||
68 | ac0 <<= 1; | ||
69 | } | ||
70 | |||
71 | xs = x+lag-1; | ||
72 | nshift = -shift; | ||
73 | __asm__ __volatile__ | ||
74 | ( | ||
75 | "P2 = %0;\n\t" | ||
76 | "I0 = P2;\n\t" /* x in I0 */ | ||
77 | "B0 = P2;\n\t" /* x in B0 */ | ||
78 | "R0 = %3;\n\t" /* len in R0 */ | ||
79 | "P3 = %3;\n\t" /* len in R0 */ | ||
80 | "P4 = %4;\n\t" /* nb_pitch in R0 */ | ||
81 | "R1 = R0 << 1;\n\t" /* number of bytes in x */ | ||
82 | "L0 = R1;\n\t" | ||
83 | "P0 = %1;\n\t" | ||
84 | "P1 = %2;\n\t" | ||
85 | "B1 = P1;\n\t" | ||
86 | "R4 = %5;\n\t" | ||
87 | "L1 = 0;\n\t" /*Disable looping on I1*/ | ||
88 | |||
89 | "r0 = [I0++];\n\t" | ||
90 | "R2 = 0;R3=0;" | ||
91 | "LOOP pitch%= LC0 = P4 >> 1;\n\t" | ||
92 | "LOOP_BEGIN pitch%=;\n\t" | ||
93 | "I1 = P0;\n\t" | ||
94 | "A1 = A0 = 0;\n\t" | ||
95 | "R1 = [I1++];\n\t" | ||
96 | "LOOP inner_prod%= LC1 = P3 >> 1;\n\t" | ||
97 | "LOOP_BEGIN inner_prod%=;\n\t" | ||
98 | "A1 += R0.L*R1.H, A0 += R0.L*R1.L (IS) || R1.L = W[I1++];\n\t" | ||
99 | "A1 += R0.H*R1.L, A0 += R0.H*R1.H (IS) || R1.H = W[I1++] || R0 = [I0++];\n\t" | ||
100 | "LOOP_END inner_prod%=;\n\t" | ||
101 | "A0 = ASHIFT A0 by R4.L;\n\t" | ||
102 | "A1 = ASHIFT A1 by R4.L;\n\t" | ||
103 | |||
104 | "R2 = A0, R3 = A1;\n\t" | ||
105 | "[P1--] = R2;\n\t" | ||
106 | "[P1--] = R3;\n\t" | ||
107 | "P0 += 4;\n\t" | ||
108 | "LOOP_END pitch%=;\n\t" | ||
109 | : : "m" (xs), "m" (x), "m" (ac32top), "m" (N_lag), "m" (lag_1), "m" (nshift) | ||
110 | : "A0", "A1", "P0", "P1", "P2", "P3", "P4", "R0", "R1", "R2", "R3", "R4", "I0", "I1", "L0", "L1", "B0", "B1", "memory" | ||
111 | ); | ||
112 | d=0; | ||
113 | for (j=0;j<n;j++) | ||
114 | { | ||
115 | d = ADD32(d,SHR32(MULT16_16(x[j],x[j]), shift)); | ||
116 | } | ||
117 | ac32[0] = d; | ||
118 | |||
119 | for (i=0;i<lag;i++) | ||
120 | { | ||
121 | d=0; | ||
122 | for (j=i;j<lag_1;j++) | ||
123 | { | ||
124 | d = ADD32(d,SHR32(MULT16_16(x[j],x[j-i]), shift)); | ||
125 | } | ||
126 | if (i) | ||
127 | ac32[i] += d; | ||
128 | ac[i] = SHR32(ac32[i], ac_shift); | ||
129 | } | ||
130 | } | ||
131 | |||