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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 // MSVC++ requires this to be set before any other includes to get M_SQRT1_2. | 5 // MSVC++ requires this to be set before any other includes to get M_SQRT1_2. |
6 #define _USE_MATH_DEFINES | 6 #define _USE_MATH_DEFINES |
7 | 7 |
8 #include "media/base/channel_mixing_matrix.h" | 8 #include "media/base/channel_mixing_matrix.h" |
9 | 9 |
| 10 #include <stddef.h> |
| 11 |
10 #include <algorithm> | 12 #include <algorithm> |
11 #include <cmath> | 13 #include <cmath> |
12 | 14 |
13 #include "base/logging.h" | 15 #include "base/logging.h" |
14 | 16 |
15 namespace media { | 17 namespace media { |
16 | 18 |
17 // Default scale factor for mixing two channels together. We use a different | 19 // Default scale factor for mixing two channels together. We use a different |
18 // value for stereo -> mono and mono -> stereo mixes. | 20 // value for stereo -> mono and mono -> stereo mixes. |
19 static const float kEqualPowerScale = static_cast<float>(M_SQRT1_2); | 21 static const float kEqualPowerScale = static_cast<float>(M_SQRT1_2); |
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295 | 297 |
296 DCHECK(IsUnaccounted(input_ch)); | 298 DCHECK(IsUnaccounted(input_ch)); |
297 DCHECK_GE(input_ch_index, 0); | 299 DCHECK_GE(input_ch_index, 0); |
298 DCHECK_GE(output_ch_index, 0); | 300 DCHECK_GE(output_ch_index, 0); |
299 | 301 |
300 DCHECK_EQ((*matrix_)[output_ch_index][input_ch_index], 0); | 302 DCHECK_EQ((*matrix_)[output_ch_index][input_ch_index], 0); |
301 (*matrix_)[output_ch_index][input_ch_index] = scale; | 303 (*matrix_)[output_ch_index][input_ch_index] = scale; |
302 } | 304 } |
303 | 305 |
304 } // namespace media | 306 } // namespace media |
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