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1 /* | 1 /* |
2 * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2014 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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28 // is supplied to the given callback for processing. The processed output is | 28 // is supplied to the given callback for processing. The processed output is |
29 // then inverse transformed into the time domain and spliced back into a chunk | 29 // then inverse transformed into the time domain and spliced back into a chunk |
30 // which constitutes the final output of this processing module. | 30 // which constitutes the final output of this processing module. |
31 class LappedTransform { | 31 class LappedTransform { |
32 public: | 32 public: |
33 class Callback { | 33 class Callback { |
34 public: | 34 public: |
35 virtual ~Callback() {} | 35 virtual ~Callback() {} |
36 | 36 |
37 virtual void ProcessAudioBlock(const std::complex<float>* const* in_block, | 37 virtual void ProcessAudioBlock(const std::complex<float>* const* in_block, |
38 int num_in_channels, int frames, | 38 int num_in_channels, size_t frames, |
39 int num_out_channels, | 39 int num_out_channels, |
40 std::complex<float>* const* out_block) = 0; | 40 std::complex<float>* const* out_block) = 0; |
41 }; | 41 }; |
42 | 42 |
43 // Construct a transform instance. |chunk_length| is the number of samples in | 43 // Construct a transform instance. |chunk_length| is the number of samples in |
44 // each channel. |window| defines the window, owned by the caller (a copy is | 44 // each channel. |window| defines the window, owned by the caller (a copy is |
45 // made internally); |window| should have length equal to |block_length|. | 45 // made internally); |window| should have length equal to |block_length|. |
46 // |block_length| defines the length of a block, in samples. | 46 // |block_length| defines the length of a block, in samples. |
47 // |shift_amount| is in samples. |callback| is the caller-owned audio | 47 // |shift_amount| is in samples. |callback| is the caller-owned audio |
48 // processing function called for each block of the input chunk. | 48 // processing function called for each block of the input chunk. |
49 LappedTransform(int num_in_channels, int num_out_channels, int chunk_length, | 49 LappedTransform(int num_in_channels, |
50 const float* window, int block_length, int shift_amount, | 50 int num_out_channels, |
| 51 size_t chunk_length, |
| 52 const float* window, |
| 53 size_t block_length, |
| 54 size_t shift_amount, |
51 Callback* callback); | 55 Callback* callback); |
52 ~LappedTransform() {} | 56 ~LappedTransform() {} |
53 | 57 |
54 // Main audio processing helper method. Internally slices |in_chunk| into | 58 // Main audio processing helper method. Internally slices |in_chunk| into |
55 // blocks, transforms them to frequency domain, calls the callback for each | 59 // blocks, transforms them to frequency domain, calls the callback for each |
56 // block and returns a de-blocked time domain chunk of audio through | 60 // block and returns a de-blocked time domain chunk of audio through |
57 // |out_chunk|. Both buffers are caller-owned. | 61 // |out_chunk|. Both buffers are caller-owned. |
58 void ProcessChunk(const float* const* in_chunk, float* const* out_chunk); | 62 void ProcessChunk(const float* const* in_chunk, float* const* out_chunk); |
59 | 63 |
60 // Get the chunk length. | 64 // Get the chunk length. |
61 // | 65 // |
62 // The chunk length is the number of samples per channel that must be passed | 66 // The chunk length is the number of samples per channel that must be passed |
63 // to ProcessChunk via the parameter in_chunk. | 67 // to ProcessChunk via the parameter in_chunk. |
64 // | 68 // |
65 // Returns the same chunk_length passed to the LappedTransform constructor. | 69 // Returns the same chunk_length passed to the LappedTransform constructor. |
66 int chunk_length() const { return chunk_length_; } | 70 size_t chunk_length() const { return chunk_length_; } |
67 | 71 |
68 // Get the number of input channels. | 72 // Get the number of input channels. |
69 // | 73 // |
70 // This is the number of arrays that must be passed to ProcessChunk via | 74 // This is the number of arrays that must be passed to ProcessChunk via |
71 // in_chunk. | 75 // in_chunk. |
72 // | 76 // |
73 // Returns the same num_in_channels passed to the LappedTransform constructor. | 77 // Returns the same num_in_channels passed to the LappedTransform constructor. |
74 int num_in_channels() const { return num_in_channels_; } | 78 int num_in_channels() const { return num_in_channels_; } |
75 | 79 |
76 // Get the number of output channels. | 80 // Get the number of output channels. |
77 // | 81 // |
78 // This is the number of arrays that must be passed to ProcessChunk via | 82 // This is the number of arrays that must be passed to ProcessChunk via |
79 // out_chunk. | 83 // out_chunk. |
80 // | 84 // |
81 // Returns the same num_out_channels passed to the LappedTransform | 85 // Returns the same num_out_channels passed to the LappedTransform |
82 // constructor. | 86 // constructor. |
83 int num_out_channels() const { return num_out_channels_; } | 87 int num_out_channels() const { return num_out_channels_; } |
84 | 88 |
85 private: | 89 private: |
86 // Internal middleware callback, given to the blocker. Transforms each block | 90 // Internal middleware callback, given to the blocker. Transforms each block |
87 // and hands it over to the processing method given at construction time. | 91 // and hands it over to the processing method given at construction time. |
88 class BlockThunk : public BlockerCallback { | 92 class BlockThunk : public BlockerCallback { |
89 public: | 93 public: |
90 explicit BlockThunk(LappedTransform* parent) : parent_(parent) {} | 94 explicit BlockThunk(LappedTransform* parent) : parent_(parent) {} |
91 | 95 |
92 virtual void ProcessBlock(const float* const* input, int num_frames, | 96 virtual void ProcessBlock(const float* const* input, size_t num_frames, |
93 int num_input_channels, int num_output_channels, | 97 int num_input_channels, int num_output_channels, |
94 float* const* output); | 98 float* const* output); |
95 | 99 |
96 private: | 100 private: |
97 LappedTransform* const parent_; | 101 LappedTransform* const parent_; |
98 } blocker_callback_; | 102 } blocker_callback_; |
99 | 103 |
100 const int num_in_channels_; | 104 const int num_in_channels_; |
101 const int num_out_channels_; | 105 const int num_out_channels_; |
102 | 106 |
103 const int block_length_; | 107 const size_t block_length_; |
104 const int chunk_length_; | 108 const size_t chunk_length_; |
105 | 109 |
106 Callback* const block_processor_; | 110 Callback* const block_processor_; |
107 Blocker blocker_; | 111 Blocker blocker_; |
108 | 112 |
109 rtc::scoped_ptr<RealFourier> fft_; | 113 rtc::scoped_ptr<RealFourier> fft_; |
110 const int cplx_length_; | 114 const size_t cplx_length_; |
111 AlignedArray<float> real_buf_; | 115 AlignedArray<float> real_buf_; |
112 AlignedArray<std::complex<float> > cplx_pre_; | 116 AlignedArray<std::complex<float> > cplx_pre_; |
113 AlignedArray<std::complex<float> > cplx_post_; | 117 AlignedArray<std::complex<float> > cplx_post_; |
114 }; | 118 }; |
115 | 119 |
116 } // namespace webrtc | 120 } // namespace webrtc |
117 | 121 |
118 #endif // WEBRTC_COMMON_AUDIO_LAPPED_TRANSFORM_H_ | 122 #endif // WEBRTC_COMMON_AUDIO_LAPPED_TRANSFORM_H_ |
119 | 123 |
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