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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 * A wrapper for resampling a numerous amount of sampling combinations. | 13 * A wrapper for resampling a numerous amount of sampling combinations. |
14 */ | 14 */ |
15 | 15 |
16 #ifndef WEBRTC_COMMON_AUDIO_RESAMPLER_INCLUDE_RESAMPLER_H_ | 16 #ifndef WEBRTC_RESAMPLER_RESAMPLER_H_ |
17 #define WEBRTC_COMMON_AUDIO_RESAMPLER_INCLUDE_RESAMPLER_H_ | 17 #define WEBRTC_RESAMPLER_RESAMPLER_H_ |
18 | 18 |
19 #include <stddef.h> | 19 #include <stddef.h> |
20 | 20 |
21 #include "webrtc/typedefs.h" | 21 #include "webrtc/typedefs.h" |
22 | 22 |
23 namespace webrtc { | 23 namespace webrtc { |
24 | 24 |
25 // All methods return 0 on success and -1 on failure. | 25 // All methods return 0 on success and -1 on failure. |
26 class Resampler { | 26 class Resampler |
27 public: | 27 { |
28 Resampler(); | |
29 Resampler(int inFreq, int outFreq, size_t num_channels); | |
30 ~Resampler(); | |
31 | 28 |
32 // Reset all states | 29 public: |
33 int Reset(int inFreq, int outFreq, size_t num_channels); | 30 Resampler(); |
| 31 Resampler(int inFreq, int outFreq, size_t num_channels); |
| 32 ~Resampler(); |
34 | 33 |
35 // Reset all states if any parameter has changed | 34 // Reset all states |
36 int ResetIfNeeded(int inFreq, int outFreq, size_t num_channels); | 35 int Reset(int inFreq, int outFreq, size_t num_channels); |
37 | 36 |
38 // Resample samplesIn to samplesOut. | 37 // Reset all states if any parameter has changed |
39 int Push(const int16_t* samplesIn, size_t lengthIn, int16_t* samplesOut, | 38 int ResetIfNeeded(int inFreq, int outFreq, size_t num_channels); |
40 size_t maxLen, size_t& outLen); // NOLINT: to avoid changing APIs | |
41 | 39 |
42 private: | 40 // Resample samplesIn to samplesOut. |
43 enum ResamplerMode { | 41 int Push(const int16_t* samplesIn, size_t lengthIn, int16_t* samplesOut, |
44 kResamplerMode1To1, | 42 size_t maxLen, size_t &outLen); |
45 kResamplerMode1To2, | |
46 kResamplerMode1To3, | |
47 kResamplerMode1To4, | |
48 kResamplerMode1To6, | |
49 kResamplerMode1To12, | |
50 kResamplerMode2To3, | |
51 kResamplerMode2To11, | |
52 kResamplerMode4To11, | |
53 kResamplerMode8To11, | |
54 kResamplerMode11To16, | |
55 kResamplerMode11To32, | |
56 kResamplerMode2To1, | |
57 kResamplerMode3To1, | |
58 kResamplerMode4To1, | |
59 kResamplerMode6To1, | |
60 kResamplerMode12To1, | |
61 kResamplerMode3To2, | |
62 kResamplerMode11To2, | |
63 kResamplerMode11To4, | |
64 kResamplerMode11To8 | |
65 }; | |
66 | 43 |
67 // Generic pointers since we don't know what states we'll need | 44 private: |
68 void* state1_; | 45 enum ResamplerMode |
69 void* state2_; | 46 { |
70 void* state3_; | 47 kResamplerMode1To1, |
| 48 kResamplerMode1To2, |
| 49 kResamplerMode1To3, |
| 50 kResamplerMode1To4, |
| 51 kResamplerMode1To6, |
| 52 kResamplerMode1To12, |
| 53 kResamplerMode2To3, |
| 54 kResamplerMode2To11, |
| 55 kResamplerMode4To11, |
| 56 kResamplerMode8To11, |
| 57 kResamplerMode11To16, |
| 58 kResamplerMode11To32, |
| 59 kResamplerMode2To1, |
| 60 kResamplerMode3To1, |
| 61 kResamplerMode4To1, |
| 62 kResamplerMode6To1, |
| 63 kResamplerMode12To1, |
| 64 kResamplerMode3To2, |
| 65 kResamplerMode11To2, |
| 66 kResamplerMode11To4, |
| 67 kResamplerMode11To8 |
| 68 }; |
71 | 69 |
72 // Storage if needed | 70 // Generic pointers since we don't know what states we'll need |
73 int16_t* in_buffer_; | 71 void* state1_; |
74 int16_t* out_buffer_; | 72 void* state2_; |
75 size_t in_buffer_size_; | 73 void* state3_; |
76 size_t out_buffer_size_; | |
77 size_t in_buffer_size_max_; | |
78 size_t out_buffer_size_max_; | |
79 | 74 |
80 int my_in_frequency_khz_; | 75 // Storage if needed |
81 int my_out_frequency_khz_; | 76 int16_t* in_buffer_; |
82 ResamplerMode my_mode_; | 77 int16_t* out_buffer_; |
83 size_t num_channels_; | 78 size_t in_buffer_size_; |
| 79 size_t out_buffer_size_; |
| 80 size_t in_buffer_size_max_; |
| 81 size_t out_buffer_size_max_; |
84 | 82 |
85 // Extra instance for stereo | 83 int my_in_frequency_khz_; |
86 Resampler* slave_left_; | 84 int my_out_frequency_khz_; |
87 Resampler* slave_right_; | 85 ResamplerMode my_mode_; |
| 86 size_t num_channels_; |
| 87 |
| 88 // Extra instance for stereo |
| 89 Resampler* slave_left_; |
| 90 Resampler* slave_right_; |
88 }; | 91 }; |
89 | 92 |
90 } // namespace webrtc | 93 } // namespace webrtc |
91 | 94 |
92 #endif // WEBRTC_COMMON_AUDIO_RESAMPLER_INCLUDE_RESAMPLER_H_ | 95 #endif // WEBRTC_RESAMPLER_RESAMPLER_H_ |
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