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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 * lattice.c | 12 * lattice.c |
13 * | 13 * |
14 * Contains the normalized lattice filter routines (MA and AR) for iSAC codec | 14 * Contains the normalized lattice filter routines (MA and AR) for iSAC codec |
15 * | 15 * |
16 */ | 16 */ |
17 | 17 |
18 #include "codec.h" | 18 #include "codec.h" |
19 #include "settings.h" | 19 #include "settings.h" |
20 #include "webrtc/base/sanitizer.h" | 20 #include "webrtc/rtc_base/sanitizer.h" |
21 | 21 |
22 #define LATTICE_MUL_32_32_RSFT16(a32a, a32b, b32) \ | 22 #define LATTICE_MUL_32_32_RSFT16(a32a, a32b, b32) \ |
23 ((int32_t)(WEBRTC_SPL_MUL(a32a, b32) + (WEBRTC_SPL_MUL_16_32_RSFT16(a32b, b32)
))) | 23 ((int32_t)(WEBRTC_SPL_MUL(a32a, b32) + (WEBRTC_SPL_MUL_16_32_RSFT16(a32b, b32)
))) |
24 /* This macro is FORBIDDEN to use elsewhere than in a function in this file and | 24 /* This macro is FORBIDDEN to use elsewhere than in a function in this file and |
25 its corresponding neon version. It might give unpredictable results, since a | 25 its corresponding neon version. It might give unpredictable results, since a |
26 general int32_t*int32_t multiplication results in a 64 bit value. | 26 general int32_t*int32_t multiplication results in a 64 bit value. |
27 The result is then shifted just 16 steps to the right, giving need for 48 | 27 The result is then shifted just 16 steps to the right, giving need for 48 |
28 bits, i.e. in the generel case, it will NOT fit in a int32_t. In the | 28 bits, i.e. in the generel case, it will NOT fit in a int32_t. In the |
29 cases used in here, the int32_t will be enough, since (for a good | 29 cases used in here, the int32_t will be enough, since (for a good |
30 reason) the involved multiplicands aren't big enough to overflow a | 30 reason) the involved multiplicands aren't big enough to overflow a |
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313 /* cannot use memcpy in the following */ | 313 /* cannot use memcpy in the following */ |
314 | 314 |
315 for (i=0;i<ord_1;i++) | 315 for (i=0;i<ord_1;i++) |
316 { | 316 { |
317 stateGQ0[i] = ARgQ0vec[i]; | 317 stateGQ0[i] = ARgQ0vec[i]; |
318 } | 318 } |
319 } | 319 } |
320 | 320 |
321 return; | 321 return; |
322 } | 322 } |
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