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1 /* | 1 /* |
2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 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 | 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 | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
11 /****************************************************************** | 11 /****************************************************************** |
12 | 12 |
13 iLBC Speech Coder ANSI-C Source Code | 13 iLBC Speech Coder ANSI-C Source Code |
14 | 14 |
15 WebRtcIlbcfix_CbMemEnergyCalc.c | 15 WebRtcIlbcfix_CbMemEnergyCalc.c |
16 | 16 |
17 ******************************************************************/ | 17 ******************************************************************/ |
18 | 18 |
19 #include "defines.h" | 19 #include "defines.h" |
20 | 20 |
21 /* Compute the energy of the rest of the cb memory | 21 /* Compute the energy of the rest of the cb memory |
22 * by step wise adding and subtracting the next | 22 * by step wise adding and subtracting the next |
23 * sample and the last sample respectively */ | 23 * sample and the last sample respectively */ |
24 void WebRtcIlbcfix_CbMemEnergyCalc( | 24 void WebRtcIlbcfix_CbMemEnergyCalc( |
25 int32_t energy, /* (i) input start energy */ | 25 int32_t energy, /* (i) input start energy */ |
26 int16_t range, /* (i) number of iterations */ | 26 size_t range, /* (i) number of iterations */ |
27 int16_t *ppi, /* (i) input pointer 1 */ | 27 int16_t *ppi, /* (i) input pointer 1 */ |
28 int16_t *ppo, /* (i) input pointer 2 */ | 28 int16_t *ppo, /* (i) input pointer 2 */ |
29 int16_t *energyW16, /* (o) Energy in the CB vectors */ | 29 int16_t *energyW16, /* (o) Energy in the CB vectors */ |
30 int16_t *energyShifts, /* (o) Shift value of the energy */ | 30 int16_t *energyShifts, /* (o) Shift value of the energy */ |
31 int scale, /* (i) The scaling of all energy values */ | 31 int scale, /* (i) The scaling of all energy values */ |
32 int16_t base_size /* (i) Index to where energy values should be stored */ | 32 size_t base_size /* (i) Index to where energy values should be stored */ |
33 ) | 33 ) |
34 { | 34 { |
35 int16_t j,shft; | 35 size_t j; |
| 36 int16_t shft; |
36 int32_t tmp; | 37 int32_t tmp; |
37 int16_t *eSh_ptr; | 38 int16_t *eSh_ptr; |
38 int16_t *eW16_ptr; | 39 int16_t *eW16_ptr; |
39 | 40 |
40 | 41 |
41 eSh_ptr = &energyShifts[1+base_size]; | 42 eSh_ptr = &energyShifts[1+base_size]; |
42 eW16_ptr = &energyW16[1+base_size]; | 43 eW16_ptr = &energyW16[1+base_size]; |
43 | 44 |
44 for (j = 0; j + 1 < range; j++) { | 45 for (j = 0; j + 1 < range; j++) { |
45 | 46 |
46 /* Calculate next energy by a +/- | 47 /* Calculate next energy by a +/- |
47 operation on the edge samples */ | 48 operation on the edge samples */ |
48 tmp = (*ppi) * (*ppi) - (*ppo) * (*ppo); | 49 tmp = (*ppi) * (*ppi) - (*ppo) * (*ppo); |
49 energy += tmp >> scale; | 50 energy += tmp >> scale; |
50 energy = WEBRTC_SPL_MAX(energy, 0); | 51 energy = WEBRTC_SPL_MAX(energy, 0); |
51 | 52 |
52 ppi--; | 53 ppi--; |
53 ppo--; | 54 ppo--; |
54 | 55 |
55 /* Normalize the energy into a int16_t and store | 56 /* Normalize the energy into a int16_t and store |
56 the number of shifts */ | 57 the number of shifts */ |
57 | 58 |
58 shft = (int16_t)WebRtcSpl_NormW32(energy); | 59 shft = (int16_t)WebRtcSpl_NormW32(energy); |
59 *eSh_ptr++ = shft; | 60 *eSh_ptr++ = shft; |
60 | 61 |
61 tmp = energy << shft; | 62 tmp = energy << shft; |
62 *eW16_ptr++ = (int16_t)(tmp >> 16); | 63 *eW16_ptr++ = (int16_t)(tmp >> 16); |
63 } | 64 } |
64 } | 65 } |
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