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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef MEDIA_BASE_SINC_RESAMPLER_H_ | 5 #ifndef MEDIA_BASE_SINC_RESAMPLER_H_ |
6 #define MEDIA_BASE_SINC_RESAMPLER_H_ | 6 #define MEDIA_BASE_SINC_RESAMPLER_H_ |
7 | 7 |
8 #include "base/callback.h" | 8 #include "base/callback.h" |
9 #include "base/gtest_prod_util.h" | 9 #include "base/gtest_prod_util.h" |
10 #include "base/memory/aligned_memory.h" | 10 #include "base/memory/aligned_memory.h" |
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27 // calls back for input. Must be greater than kKernelSize. | 27 // calls back for input. Must be greater than kKernelSize. |
28 kDefaultRequestSize = 512, | 28 kDefaultRequestSize = 512, |
29 | 29 |
30 // The kernel offset count is used for interpolation and is the number of | 30 // The kernel offset count is used for interpolation and is the number of |
31 // sub-sample kernel shifts. Can be adjusted for quality (higher is better) | 31 // sub-sample kernel shifts. Can be adjusted for quality (higher is better) |
32 // at the expense of allocating more memory. | 32 // at the expense of allocating more memory. |
33 kKernelOffsetCount = 32, | 33 kKernelOffsetCount = 32, |
34 kKernelStorageSize = kKernelSize * (kKernelOffsetCount + 1), | 34 kKernelStorageSize = kKernelSize * (kKernelOffsetCount + 1), |
35 }; | 35 }; |
36 | 36 |
37 // Selects runtime specific CPU features like SSE. Must be called before | |
38 // using SincResampler. | |
39 static void InitializeCPUSpecificFeatures(); | |
40 | |
41 // Callback type for providing more data into the resampler. Expects |frames| | 37 // Callback type for providing more data into the resampler. Expects |frames| |
42 // of data to be rendered into |destination|; zero padded if not enough frames | 38 // of data to be rendered into |destination|; zero padded if not enough frames |
43 // are available to satisfy the request. | 39 // are available to satisfy the request. |
44 typedef base::Callback<void(int frames, float* destination)> ReadCB; | 40 typedef base::Callback<void(int frames, float* destination)> ReadCB; |
45 | 41 |
46 // Constructs a SincResampler with the specified |read_cb|, which is used to | 42 // Constructs a SincResampler with the specified |read_cb|, which is used to |
47 // acquire audio data for resampling. |io_sample_rate_ratio| is the ratio | 43 // acquire audio data for resampling. |io_sample_rate_ratio| is the ratio |
48 // of input / output sample rates. |request_frames| controls the size in | 44 // of input / output sample rates. |request_frames| controls the size in |
49 // frames of the buffer requested by each |read_cb| call. The value must be | 45 // frames of the buffer requested by each |read_cb| call. The value must be |
50 // greater than kKernelSize. Specify kDefaultRequestSize if there are no | 46 // greater than kKernelSize. Specify kDefaultRequestSize if there are no |
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134 float* const r2_; | 130 float* const r2_; |
135 float* r3_; | 131 float* r3_; |
136 float* r4_; | 132 float* r4_; |
137 | 133 |
138 DISALLOW_COPY_AND_ASSIGN(SincResampler); | 134 DISALLOW_COPY_AND_ASSIGN(SincResampler); |
139 }; | 135 }; |
140 | 136 |
141 } // namespace media | 137 } // namespace media |
142 | 138 |
143 #endif // MEDIA_BASE_SINC_RESAMPLER_H_ | 139 #endif // MEDIA_BASE_SINC_RESAMPLER_H_ |
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