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1 /* | 1 /* |
2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2012 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 |
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23 // respectively, on the keypad as illustrated below. | 23 // respectively, on the keypad as illustrated below. |
24 // | 24 // |
25 // 1209 Hz 1336 Hz 1477 Hz 1633 Hz | 25 // 1209 Hz 1336 Hz 1477 Hz 1633 Hz |
26 // 697 Hz 1 2 3 12 | 26 // 697 Hz 1 2 3 12 |
27 // 770 Hz 4 5 6 13 | 27 // 770 Hz 4 5 6 13 |
28 // 852 Hz 7 8 9 14 | 28 // 852 Hz 7 8 9 14 |
29 // 941 Hz 10 0 11 15 | 29 // 941 Hz 10 0 11 15 |
30 | 30 |
31 #include "webrtc/modules/audio_coding/neteq/dtmf_tone_generator.h" | 31 #include "webrtc/modules/audio_coding/neteq/dtmf_tone_generator.h" |
32 | 32 |
33 #include "webrtc/base/arraysize.h" | 33 #include "webrtc/rtc_base/arraysize.h" |
34 #include "webrtc/base/checks.h" | 34 #include "webrtc/rtc_base/checks.h" |
35 | 35 |
36 namespace webrtc { | 36 namespace webrtc { |
37 | 37 |
38 // The filter coefficient a = 2*cos(2*pi*f/fs) for the low frequency tone, for | 38 // The filter coefficient a = 2*cos(2*pi*f/fs) for the low frequency tone, for |
39 // sample rates fs = {8000, 16000, 32000, 48000} Hz, and events 0 through 15. | 39 // sample rates fs = {8000, 16000, 32000, 48000} Hz, and events 0 through 15. |
40 // Values are in Q14. | 40 // Values are in Q14. |
41 const int DtmfToneGenerator::kCoeff1[4][16] = { | 41 const int DtmfToneGenerator::kCoeff1[4][16] = { |
42 { 24219, 27980, 27980, 27980, 26956, 26956, 26956, 25701, 25701, 25701, | 42 { 24219, 27980, 27980, 27980, 26956, 26956, 26956, 25701, 25701, 25701, |
43 24219, 24219, 27980, 26956, 25701, 24219 }, | 43 24219, 24219, 27980, 26956, 25701, 24219 }, |
44 { 30556, 31548, 31548, 31548, 31281, 31281, 31281, 30951, 30951, 30951, | 44 { 30556, 31548, 31548, 31548, 31281, 31281, 31281, 30951, 30951, 30951, |
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209 } | 209 } |
210 | 210 |
211 return static_cast<int>(num_samples); | 211 return static_cast<int>(num_samples); |
212 } | 212 } |
213 | 213 |
214 bool DtmfToneGenerator::initialized() const { | 214 bool DtmfToneGenerator::initialized() const { |
215 return initialized_; | 215 return initialized_; |
216 } | 216 } |
217 | 217 |
218 } // namespace webrtc | 218 } // namespace webrtc |
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