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gerrit.openfyde.cn / webrtc.googlesource.com / src / 7da3459b2ac83923c1ccbf11ad24d3f700305feb / . / webrtc / common_audio / signal_processing / complex_fft.c
blob: 947ceb891a288feb6c538175a1a5a1bf74294f80 [file] [log] [blame]
niklase@google.com470e71d2011-07-07 08:21:25 +0000[diff] [blame]1/*
2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11
12/*
13 * This file contains the function WebRtcSpl_ComplexFFT().
14 * The description header can be found in signal_processing_library.h
15 *
16 */
17
18#include "signal_processing_library.h"
19
20#define CFFTSFT 14
21#define CFFTRND 1
22#define CFFTRND2 16384
23
bjornv@webrtc.org132feb12011-12-01 15:40:50 +0000[diff] [blame]24#define CIFFTSFT 14
25#define CIFFTRND 1
26
27static const WebRtc_Word16 kSinTable1024[] = {
28 0, 201, 402, 603, 804, 1005, 1206, 1406,
29 1607, 1808, 2009, 2209, 2410, 2610, 2811, 3011,
30 3211, 3411, 3611, 3811, 4011, 4210, 4409, 4608,
31 4807, 5006, 5205, 5403, 5601, 5799, 5997, 6195,
32 6392, 6589, 6786, 6982, 7179, 7375, 7571, 7766,
33 7961, 8156, 8351, 8545, 8739, 8932, 9126, 9319,
34 9511, 9703, 9895, 10087, 10278, 10469, 10659, 10849,
35 11038, 11227, 11416, 11604, 11792, 11980, 12166, 12353,
36 12539, 12724, 12909, 13094, 13278, 13462, 13645, 13827,
37 14009, 14191, 14372, 14552, 14732, 14911, 15090, 15268,
38 15446, 15623, 15799, 15975, 16150, 16325, 16499, 16672,
39 16845, 17017, 17189, 17360, 17530, 17699, 17868, 18036,
40 18204, 18371, 18537, 18702, 18867, 19031, 19194, 19357,
41 19519, 19680, 19840, 20000, 20159, 20317, 20474, 20631,
42 20787, 20942, 21096, 21249, 21402, 21554, 21705, 21855,
43 22004, 22153, 22301, 22448, 22594, 22739, 22883, 23027,
44 23169, 23311, 23452, 23592, 23731, 23869, 24006, 24143,
45 24278, 24413, 24546, 24679, 24811, 24942, 25072, 25201,
46 25329, 25456, 25582, 25707, 25831, 25954, 26077, 26198,
47 26318, 26437, 26556, 26673, 26789, 26905, 27019, 27132,
48 27244, 27355, 27466, 27575, 27683, 27790, 27896, 28001,
49 28105, 28208, 28309, 28410, 28510, 28608, 28706, 28802,
50 28897, 28992, 29085, 29177, 29268, 29358, 29446, 29534,
51 29621, 29706, 29790, 29873, 29955, 30036, 30116, 30195,
52 30272, 30349, 30424, 30498, 30571, 30643, 30713, 30783,
53 30851, 30918, 30984, 31049,
54 31113, 31175, 31236, 31297,
55 31356, 31413, 31470, 31525, 31580, 31633, 31684, 31735,
56 31785, 31833, 31880, 31926, 31970, 32014, 32056, 32097,
57 32137, 32176, 32213, 32249, 32284, 32318, 32350, 32382,
58 32412, 32441, 32468, 32495, 32520, 32544, 32567, 32588,
59 32609, 32628, 32646, 32662, 32678, 32692, 32705, 32717,
60 32727, 32736, 32744, 32751, 32757, 32761, 32764, 32766,
61 32767, 32766, 32764, 32761, 32757, 32751, 32744, 32736,
62 32727, 32717, 32705, 32692, 32678, 32662, 32646, 32628,
63 32609, 32588, 32567, 32544, 32520, 32495, 32468, 32441,
64 32412, 32382, 32350, 32318, 32284, 32249, 32213, 32176,
65 32137, 32097, 32056, 32014, 31970, 31926, 31880, 31833,
66 31785, 31735, 31684, 31633, 31580, 31525, 31470, 31413,
67 31356, 31297, 31236, 31175, 31113, 31049, 30984, 30918,
68 30851, 30783, 30713, 30643, 30571, 30498, 30424, 30349,
69 30272, 30195, 30116, 30036, 29955, 29873, 29790, 29706,
70 29621, 29534, 29446, 29358, 29268, 29177, 29085, 28992,
71 28897, 28802, 28706, 28608, 28510, 28410, 28309, 28208,
72 28105, 28001, 27896, 27790, 27683, 27575, 27466, 27355,
73 27244, 27132, 27019, 26905, 26789, 26673, 26556, 26437,
74 26318, 26198, 26077, 25954, 25831, 25707, 25582, 25456,
75 25329, 25201, 25072, 24942, 24811, 24679, 24546, 24413,
76 24278, 24143, 24006, 23869, 23731, 23592, 23452, 23311,
77 23169, 23027, 22883, 22739, 22594, 22448, 22301, 22153,
78 22004, 21855, 21705, 21554, 21402, 21249, 21096, 20942,
79 20787, 20631, 20474, 20317, 20159, 20000, 19840, 19680,
80 19519, 19357, 19194, 19031, 18867, 18702, 18537, 18371,
81 18204, 18036, 17868, 17699, 17530, 17360, 17189, 17017,
82 16845, 16672, 16499, 16325, 16150, 15975, 15799, 15623,
83 15446, 15268, 15090, 14911, 14732, 14552, 14372, 14191,
84 14009, 13827, 13645, 13462, 13278, 13094, 12909, 12724,
85 12539, 12353, 12166, 11980, 11792, 11604, 11416, 11227,
86 11038, 10849, 10659, 10469, 10278, 10087, 9895, 9703,
87 9511, 9319, 9126, 8932, 8739, 8545, 8351, 8156,
88 7961, 7766, 7571, 7375, 7179, 6982, 6786, 6589,
89 6392, 6195, 5997, 5799, 5601, 5403, 5205, 5006,
90 4807, 4608, 4409, 4210, 4011, 3811, 3611, 3411,
91 3211, 3011, 2811, 2610, 2410, 2209, 2009, 1808,
92 1607, 1406, 1206, 1005, 804, 603, 402, 201,
93 0, -201, -402, -603, -804, -1005, -1206, -1406,
94 -1607, -1808, -2009, -2209, -2410, -2610, -2811, -3011,
95 -3211, -3411, -3611, -3811, -4011, -4210, -4409, -4608,
96 -4807, -5006, -5205, -5403, -5601, -5799, -5997, -6195,
97 -6392, -6589, -6786, -6982, -7179, -7375, -7571, -7766,
98 -7961, -8156, -8351, -8545, -8739, -8932, -9126, -9319,
99 -9511, -9703, -9895, -10087, -10278, -10469, -10659, -10849,
100 -11038, -11227, -11416, -11604, -11792, -11980, -12166, -12353,
101 -12539, -12724, -12909, -13094, -13278, -13462, -13645, -13827,
102 -14009, -14191, -14372, -14552, -14732, -14911, -15090, -15268,
103 -15446, -15623, -15799, -15975, -16150, -16325, -16499, -16672,
104 -16845, -17017, -17189, -17360, -17530, -17699, -17868, -18036,
105 -18204, -18371, -18537, -18702, -18867, -19031, -19194, -19357,
106 -19519, -19680, -19840, -20000, -20159, -20317, -20474, -20631,
107 -20787, -20942, -21096, -21249, -21402, -21554, -21705, -21855,
108 -22004, -22153, -22301, -22448, -22594, -22739, -22883, -23027,
109 -23169, -23311, -23452, -23592, -23731, -23869, -24006, -24143,
110 -24278, -24413, -24546, -24679, -24811, -24942, -25072, -25201,
111 -25329, -25456, -25582, -25707, -25831, -25954, -26077, -26198,
112 -26318, -26437, -26556, -26673, -26789, -26905, -27019, -27132,
113 -27244, -27355, -27466, -27575, -27683, -27790, -27896, -28001,
114 -28105, -28208, -28309, -28410, -28510, -28608, -28706, -28802,
115 -28897, -28992, -29085, -29177, -29268, -29358, -29446, -29534,
116 -29621, -29706, -29790, -29873, -29955, -30036, -30116, -30195,
117 -30272, -30349, -30424, -30498, -30571, -30643, -30713, -30783,
118 -30851, -30918, -30984, -31049, -31113, -31175, -31236, -31297,
119 -31356, -31413, -31470, -31525, -31580, -31633, -31684, -31735,
120 -31785, -31833, -31880, -31926, -31970, -32014, -32056, -32097,
121 -32137, -32176, -32213, -32249, -32284, -32318, -32350, -32382,
122 -32412, -32441, -32468, -32495, -32520, -32544, -32567, -32588,
123 -32609, -32628, -32646, -32662, -32678, -32692, -32705, -32717,
124 -32727, -32736, -32744, -32751, -32757, -32761, -32764, -32766,
125 -32767, -32766, -32764, -32761, -32757, -32751, -32744, -32736,
126 -32727, -32717, -32705, -32692, -32678, -32662, -32646, -32628,
127 -32609, -32588, -32567, -32544, -32520, -32495, -32468, -32441,
128 -32412, -32382, -32350, -32318, -32284, -32249, -32213, -32176,
129 -32137, -32097, -32056, -32014, -31970, -31926, -31880, -31833,
130 -31785, -31735, -31684, -31633, -31580, -31525, -31470, -31413,
131 -31356, -31297, -31236, -31175, -31113, -31049, -30984, -30918,
132 -30851, -30783, -30713, -30643, -30571, -30498, -30424, -30349,
133 -30272, -30195, -30116, -30036, -29955, -29873, -29790, -29706,
134 -29621, -29534, -29446, -29358, -29268, -29177, -29085, -28992,
135 -28897, -28802, -28706, -28608, -28510, -28410, -28309, -28208,
136 -28105, -28001, -27896, -27790, -27683, -27575, -27466, -27355,
137 -27244, -27132, -27019, -26905, -26789, -26673, -26556, -26437,
138 -26318, -26198, -26077, -25954, -25831, -25707, -25582, -25456,
139 -25329, -25201, -25072, -24942, -24811, -24679, -24546, -24413,
140 -24278, -24143, -24006, -23869, -23731, -23592, -23452, -23311,
141 -23169, -23027, -22883, -22739, -22594, -22448, -22301, -22153,
142 -22004, -21855, -21705, -21554, -21402, -21249, -21096, -20942,
143 -20787, -20631, -20474, -20317, -20159, -20000, -19840, -19680,
144 -19519, -19357, -19194, -19031, -18867, -18702, -18537, -18371,
145 -18204, -18036, -17868, -17699, -17530, -17360, -17189, -17017,
146 -16845, -16672, -16499, -16325, -16150, -15975, -15799, -15623,
147 -15446, -15268, -15090, -14911, -14732, -14552, -14372, -14191,
148 -14009, -13827, -13645, -13462, -13278, -13094, -12909, -12724,
149 -12539, -12353, -12166, -11980, -11792, -11604, -11416, -11227,
150 -11038, -10849, -10659, -10469, -10278, -10087, -9895, -9703,
151 -9511, -9319, -9126, -8932, -8739, -8545, -8351, -8156,
152 -7961, -7766, -7571, -7375, -7179, -6982, -6786, -6589,
153 -6392, -6195, -5997, -5799, -5601, -5403, -5205, -5006,
154 -4807, -4608, -4409, -4210, -4011, -3811, -3611, -3411,
155 -3211, -3011, -2811, -2610, -2410, -2209, -2009, -1808,
156 -1607, -1406, -1206, -1005, -804, -603, -402, -201
157};
158
niklase@google.com470e71d2011-07-07 08:21:25 +0000[diff] [blame]159int WebRtcSpl_ComplexFFT(WebRtc_Word16 frfi[], int stages, int mode)
160{
161 int i, j, l, k, istep, n, m;
162 WebRtc_Word16 wr, wi;
163 WebRtc_Word32 tr32, ti32, qr32, qi32;
164
bjornv@webrtc.org132feb12011-12-01 15:40:50 +0000[diff] [blame]165 /* The 1024-value is a constant given from the size of kSinTable1024[],
niklase@google.com470e71d2011-07-07 08:21:25 +0000[diff] [blame]166 * and should not be changed depending on the input parameter 'stages'
167 */
168 n = 1 << stages;
169 if (n > 1024)
170 return -1;
171
172 l = 1;
bjornv@webrtc.org132feb12011-12-01 15:40:50 +0000[diff] [blame]173 k = 10 - 1; /* Constant for given kSinTable1024[]. Do not change
niklase@google.com470e71d2011-07-07 08:21:25 +0000[diff] [blame]174 depending on the input parameter 'stages' */
175
176 if (mode == 0)
177 {
178 // mode==0: Low-complexity and Low-accuracy mode
179 while (l < n)
180 {
181 istep = l << 1;
182
183 for (m = 0; m < l; ++m)
184 {
185 j = m << k;
186
187 /* The 256-value is a constant given as 1/4 of the size of
bjornv@webrtc.org132feb12011-12-01 15:40:50 +0000[diff] [blame]188 * kSinTable1024[], and should not be changed depending on the input
niklase@google.com470e71d2011-07-07 08:21:25 +0000[diff] [blame]189 * parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
190 */
bjornv@webrtc.org132feb12011-12-01 15:40:50 +0000[diff] [blame]191 wr = kSinTable1024[j + 256];
192 wi = -kSinTable1024[j];
niklase@google.com470e71d2011-07-07 08:21:25 +0000[diff] [blame]193
194 for (i = m; i < n; i += istep)
195 {
196 j = i + l;
197
198 tr32 = WEBRTC_SPL_RSHIFT_W32((WEBRTC_SPL_MUL_16_16(wr, frfi[2 * j])
199 - WEBRTC_SPL_MUL_16_16(wi, frfi[2 * j + 1])), 15);
200
201 ti32 = WEBRTC_SPL_RSHIFT_W32((WEBRTC_SPL_MUL_16_16(wr, frfi[2 * j + 1])
202 + WEBRTC_SPL_MUL_16_16(wi, frfi[2 * j])), 15);
203
204 qr32 = (WebRtc_Word32)frfi[2 * i];
205 qi32 = (WebRtc_Word32)frfi[2 * i + 1];
206 frfi[2 * j] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(qr32 - tr32, 1);
207 frfi[2 * j + 1] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(qi32 - ti32, 1);
208 frfi[2 * i] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(qr32 + tr32, 1);
209 frfi[2 * i + 1] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(qi32 + ti32, 1);
210 }
211 }
212
213 --k;
214 l = istep;
215
216 }
217
218 } else
219 {
220 // mode==1: High-complexity and High-accuracy mode
221 while (l < n)
222 {
223 istep = l << 1;
224
225 for (m = 0; m < l; ++m)
226 {
227 j = m << k;
228
229 /* The 256-value is a constant given as 1/4 of the size of
bjornv@webrtc.org132feb12011-12-01 15:40:50 +0000[diff] [blame]230 * kSinTable1024[], and should not be changed depending on the input
niklase@google.com470e71d2011-07-07 08:21:25 +0000[diff] [blame]231 * parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
232 */
bjornv@webrtc.org132feb12011-12-01 15:40:50 +0000[diff] [blame]233 wr = kSinTable1024[j + 256];
234 wi = -kSinTable1024[j];
niklase@google.com470e71d2011-07-07 08:21:25 +0000[diff] [blame]235
kma@webrtc.org94771cb2012-08-28 04:09:50 +0000[diff] [blame]236#ifdef WEBRTC_ARCH_ARM_V7
kma@webrtc.org7d6f1132013-03-01 23:01:14 +0000[diff] [blame]237 WebRtc_Word32 wri = 0;
238 WebRtc_Word32 frfi_r = 0;
239 __asm __volatile("pkhbt %0, %1, %2, lsl #16" : "=r"(wri) :
kma@google.com78dc99e2011-08-16 20:00:18 +0000[diff] [blame]240 "r"((WebRtc_Word32)wr), "r"((WebRtc_Word32)wi));
241#endif
242
niklase@google.com470e71d2011-07-07 08:21:25 +0000[diff] [blame]243 for (i = m; i < n; i += istep)
244 {
245 j = i + l;
246
kma@webrtc.org94771cb2012-08-28 04:09:50 +0000[diff] [blame]247#ifdef WEBRTC_ARCH_ARM_V7
kma@webrtc.org7d6f1132013-03-01 23:01:14 +0000[diff] [blame]248 __asm __volatile(
249 "pkhbt %[frfi_r], %[frfi_even], %[frfi_odd], lsl #16\n\t"
250 "smlsd %[tr32], %[wri], %[frfi_r], %[cfftrnd]\n\t"
251 "smladx %[ti32], %[wri], %[frfi_r], %[cfftrnd]\n\t"
252 :[frfi_r]"+r"(frfi_r),
253 [tr32]"=r"(tr32),
254 [ti32]"=r"(ti32)
255 :[frfi_even]"r"((WebRtc_Word32)frfi[2*j]),
256 [frfi_odd]"r"((WebRtc_Word32)frfi[2*j +1]),
257 [wri]"r"(wri),
258 [cfftrnd]"r"(CFFTRND)
259 );
kma@google.com78dc99e2011-08-16 20:00:18 +0000[diff] [blame]260
261#else
262 tr32 = WEBRTC_SPL_MUL_16_16(wr, frfi[2 * j])
263 - WEBRTC_SPL_MUL_16_16(wi, frfi[2 * j + 1]) + CFFTRND;
niklase@google.com470e71d2011-07-07 08:21:25 +0000[diff] [blame]264
kma@google.com78dc99e2011-08-16 20:00:18 +0000[diff] [blame]265 ti32 = WEBRTC_SPL_MUL_16_16(wr, frfi[2 * j + 1])
266 + WEBRTC_SPL_MUL_16_16(wi, frfi[2 * j]) + CFFTRND;
267#endif
268
269 tr32 = WEBRTC_SPL_RSHIFT_W32(tr32, 15 - CFFTSFT);
270 ti32 = WEBRTC_SPL_RSHIFT_W32(ti32, 15 - CFFTSFT);
niklase@google.com470e71d2011-07-07 08:21:25 +0000[diff] [blame]271
272 qr32 = ((WebRtc_Word32)frfi[2 * i]) << CFFTSFT;
273 qi32 = ((WebRtc_Word32)frfi[2 * i + 1]) << CFFTSFT;
kma@google.com78dc99e2011-08-16 20:00:18 +0000[diff] [blame]274
niklase@google.com470e71d2011-07-07 08:21:25 +0000[diff] [blame]275 frfi[2 * j] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(
276 (qr32 - tr32 + CFFTRND2), 1 + CFFTSFT);
277 frfi[2 * j + 1] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(
278 (qi32 - ti32 + CFFTRND2), 1 + CFFTSFT);
279 frfi[2 * i] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(
280 (qr32 + tr32 + CFFTRND2), 1 + CFFTSFT);
281 frfi[2 * i + 1] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(
282 (qi32 + ti32 + CFFTRND2), 1 + CFFTSFT);
283 }
284 }
285
286 --k;
287 l = istep;
288 }
289 }
290 return 0;
291}
bjornv@webrtc.org132feb12011-12-01 15:40:50 +0000[diff] [blame]292
293int WebRtcSpl_ComplexIFFT(WebRtc_Word16 frfi[], int stages, int mode)
294{
295 int i, j, l, k, istep, n, m, scale, shift;
296 WebRtc_Word16 wr, wi;
297 WebRtc_Word32 tr32, ti32, qr32, qi32;
298 WebRtc_Word32 tmp32, round2;
299
300 /* The 1024-value is a constant given from the size of kSinTable1024[],
301 * and should not be changed depending on the input parameter 'stages'
302 */
303 n = 1 << stages;
304 if (n > 1024)
305 return -1;
306
307 scale = 0;
308
309 l = 1;
310 k = 10 - 1; /* Constant for given kSinTable1024[]. Do not change
311 depending on the input parameter 'stages' */
312
313 while (l < n)
314 {
315 // variable scaling, depending upon data
316 shift = 0;
317 round2 = 8192;
318
319 tmp32 = (WebRtc_Word32)WebRtcSpl_MaxAbsValueW16(frfi, 2 * n);
320 if (tmp32 > 13573)
321 {
322 shift++;
323 scale++;
324 round2 <<= 1;
325 }
326 if (tmp32 > 27146)
327 {
328 shift++;
329 scale++;
330 round2 <<= 1;
331 }
332
333 istep = l << 1;
334
335 if (mode == 0)
336 {
337 // mode==0: Low-complexity and Low-accuracy mode
338 for (m = 0; m < l; ++m)
339 {
340 j = m << k;
341
342 /* The 256-value is a constant given as 1/4 of the size of
343 * kSinTable1024[], and should not be changed depending on the input
344 * parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
345 */
346 wr = kSinTable1024[j + 256];
347 wi = kSinTable1024[j];
348
349 for (i = m; i < n; i += istep)
350 {
351 j = i + l;
352
353 tr32 = WEBRTC_SPL_RSHIFT_W32((WEBRTC_SPL_MUL_16_16_RSFT(wr, frfi[2 * j], 0)
354 - WEBRTC_SPL_MUL_16_16_RSFT(wi, frfi[2 * j + 1], 0)), 15);
355
356 ti32 = WEBRTC_SPL_RSHIFT_W32(
357 (WEBRTC_SPL_MUL_16_16_RSFT(wr, frfi[2 * j + 1], 0)
358 + WEBRTC_SPL_MUL_16_16_RSFT(wi,frfi[2*j],0)), 15);
359
360 qr32 = (WebRtc_Word32)frfi[2 * i];
361 qi32 = (WebRtc_Word32)frfi[2 * i + 1];
362 frfi[2 * j] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(qr32 - tr32, shift);
363 frfi[2 * j + 1] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(qi32 - ti32, shift);
364 frfi[2 * i] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(qr32 + tr32, shift);
365 frfi[2 * i + 1] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(qi32 + ti32, shift);
366 }
367 }
368 } else
369 {
370 // mode==1: High-complexity and High-accuracy mode
371
372 for (m = 0; m < l; ++m)
373 {
374 j = m << k;
375
376 /* The 256-value is a constant given as 1/4 of the size of
377 * kSinTable1024[], and should not be changed depending on the input
378 * parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
379 */
380 wr = kSinTable1024[j + 256];
381 wi = kSinTable1024[j];
382
kma@webrtc.org94771cb2012-08-28 04:09:50 +0000[diff] [blame]383#ifdef WEBRTC_ARCH_ARM_V7
kma@webrtc.org7d6f1132013-03-01 23:01:14 +0000[diff] [blame]384 WebRtc_Word32 wri = 0;
385 WebRtc_Word32 frfi_r = 0;
386 __asm __volatile("pkhbt %0, %1, %2, lsl #16" : "=r"(wri) :
bjornv@webrtc.org132feb12011-12-01 15:40:50 +0000[diff] [blame]387 "r"((WebRtc_Word32)wr), "r"((WebRtc_Word32)wi));
388#endif
389
390 for (i = m; i < n; i += istep)
391 {
392 j = i + l;
393
kma@webrtc.org94771cb2012-08-28 04:09:50 +0000[diff] [blame]394#ifdef WEBRTC_ARCH_ARM_V7
kma@webrtc.org7d6f1132013-03-01 23:01:14 +0000[diff] [blame]395 __asm __volatile(
396 "pkhbt %[frfi_r], %[frfi_even], %[frfi_odd], lsl #16\n\t"
397 "smlsd %[tr32], %[wri], %[frfi_r], %[cifftrnd]\n\t"
398 "smladx %[ti32], %[wri], %[frfi_r], %[cifftrnd]\n\t"
399 :[frfi_r]"+r"(frfi_r),
400 [tr32]"=r"(tr32),
401 [ti32]"=r"(ti32)
402 :[frfi_even]"r"((WebRtc_Word32)frfi[2*j]),
403 [frfi_odd]"r"((WebRtc_Word32)frfi[2*j +1]),
404 [wri]"r"(wri),
405 [cifftrnd]"r"(CIFFTRND)
406 );
bjornv@webrtc.org132feb12011-12-01 15:40:50 +0000[diff] [blame]407#else
408
409 tr32 = WEBRTC_SPL_MUL_16_16(wr, frfi[2 * j])
410 - WEBRTC_SPL_MUL_16_16(wi, frfi[2 * j + 1]) + CIFFTRND;
411
412 ti32 = WEBRTC_SPL_MUL_16_16(wr, frfi[2 * j + 1])
413 + WEBRTC_SPL_MUL_16_16(wi, frfi[2 * j]) + CIFFTRND;
414#endif
415 tr32 = WEBRTC_SPL_RSHIFT_W32(tr32, 15 - CIFFTSFT);
416 ti32 = WEBRTC_SPL_RSHIFT_W32(ti32, 15 - CIFFTSFT);
417
418 qr32 = ((WebRtc_Word32)frfi[2 * i]) << CIFFTSFT;
419 qi32 = ((WebRtc_Word32)frfi[2 * i + 1]) << CIFFTSFT;
420
421 frfi[2 * j] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32((qr32 - tr32+round2),
422 shift+CIFFTSFT);
423 frfi[2 * j + 1] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(
424 (qi32 - ti32 + round2), shift + CIFFTSFT);
425 frfi[2 * i] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32((qr32 + tr32 + round2),
426 shift + CIFFTSFT);
427 frfi[2 * i + 1] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(
428 (qi32 + ti32 + round2), shift + CIFFTSFT);
429 }
430 }
431
432 }
433 --k;
434 l = istep;
435 }
436 return scale;
437}