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author | Jean-Michel Trivi <jmtrivi@google.com> | 2013-09-10 09:15:18 -0700 |
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committer | Jean-Michel Trivi <jmtrivi@google.com> | 2013-09-17 18:43:01 -0700 |
commit | 6cc3a9948b51193dfdcb0c3527d7f3d1ca38aa3c (patch) | |
tree | 5545a323750c07f0210f43f727e828ec7fa9f918 /media/libeffects/loudness/dsp/core/dynamic_range_compression-inl.h | |
parent | 18f861404efc054da0a2ea6c582e293940f63bc8 (diff) | |
download | frameworks_av-6cc3a9948b51193dfdcb0c3527d7f3d1ca38aa3c.zip frameworks_av-6cc3a9948b51193dfdcb0c3527d7f3d1ca38aa3c.tar.gz frameworks_av-6cc3a9948b51193dfdcb0c3527d7f3d1ca38aa3c.tar.bz2 |
LoudnessEnhancer audio effect implementation
Implementation based on DRC effect, controlled by a
target gain.
The target gain is used to amplify the signal at
the input of the DRC, and to compute the knee
of the DRC.
Bug 8413913
Change-Id: I386d64793a9fa3f7218e053d6f0a99f6836c02bd
Diffstat (limited to 'media/libeffects/loudness/dsp/core/dynamic_range_compression-inl.h')
-rw-r--r-- | media/libeffects/loudness/dsp/core/dynamic_range_compression-inl.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/media/libeffects/loudness/dsp/core/dynamic_range_compression-inl.h b/media/libeffects/loudness/dsp/core/dynamic_range_compression-inl.h new file mode 100644 index 0000000..fed8c2a --- /dev/null +++ b/media/libeffects/loudness/dsp/core/dynamic_range_compression-inl.h @@ -0,0 +1,45 @@ +/* + * Copyright (C) 2013 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#ifndef LE_FX_ENGINE_DSP_CORE_DYNAMIC_RANGE_COMPRESSION_INL_H_ +#define LE_FX_ENGINE_DSP_CORE_DYNAMIC_RANGE_COMPRESSION_INL_H_ + +//#define LOG_NDEBUG 0 +#include <cutils/log.h> + + +namespace le_fx { + + +inline void AdaptiveDynamicRangeCompression::set_knee_threshold(float decibel) { + // Converts to 1og-base + knee_threshold_in_decibel_ = decibel; + knee_threshold_ = 0.1151292546497023061569109358970308676362037658691406250f * + decibel + 10.39717719035538401328722102334722876548767089843750f; +} + + +inline void AdaptiveDynamicRangeCompression::set_knee_threshold_via_target_gain( + float target_gain) { + const float decibel = target_gain_to_knee_threshold_.Interpolate( + target_gain); + ALOGE("set_knee_threshold_via_target_gain: decibel =%.3f", decibel); + set_knee_threshold(decibel); +} + +} // namespace le_fx + + +#endif // LE_FX_ENGINE_DSP_CORE_DYNAMIC_RANGE_COMPRESSION_INL_H_ |