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Diffstat (limited to 'media/libeffects/testlibs/AudioBiquadFilter.cpp')
| -rw-r--r-- | media/libeffects/testlibs/AudioBiquadFilter.cpp | 258 |
1 files changed, 0 insertions, 258 deletions
diff --git a/media/libeffects/testlibs/AudioBiquadFilter.cpp b/media/libeffects/testlibs/AudioBiquadFilter.cpp deleted file mode 100644 index 16dd1c5..0000000 --- a/media/libeffects/testlibs/AudioBiquadFilter.cpp +++ /dev/null @@ -1,258 +0,0 @@ -/* //device/servers/AudioFlinger/AudioBiquadFilter.cpp -** -** Copyright 2009, 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. -*/ - -#include <string.h> -#include <assert.h> -#include <cutils/compiler.h> - -#include "AudioBiquadFilter.h" - -namespace android { - -const audio_coef_t AudioBiquadFilter::IDENTITY_COEFS[AudioBiquadFilter::NUM_COEFS] = { AUDIO_COEF_ONE, 0, 0, 0, 0 }; - -AudioBiquadFilter::AudioBiquadFilter(int nChannels, int sampleRate) { - configure(nChannels, sampleRate); - reset(); -} - -void AudioBiquadFilter::configure(int nChannels, int sampleRate) { - assert(nChannels > 0 && nChannels <= MAX_CHANNELS); - assert(sampleRate > 0); - mNumChannels = nChannels; - mMaxDelta = static_cast<int64_t>(MAX_DELTA_PER_SEC) - * AUDIO_COEF_ONE - / sampleRate; - clear(); -} - -void AudioBiquadFilter::reset() { - memcpy(mCoefs, IDENTITY_COEFS, sizeof(mCoefs)); - mCoefDirtyBits = 0; - setState(STATE_BYPASS); -} - -void AudioBiquadFilter::clear() { - memset(mDelays, 0, sizeof(mDelays)); -} - -void AudioBiquadFilter::setCoefs(const audio_coef_t coefs[NUM_COEFS], bool immediate) { - memcpy(mTargetCoefs, coefs, sizeof(mTargetCoefs)); - if (mState & STATE_ENABLED_MASK) { - if (CC_UNLIKELY(immediate)) { - memcpy(mCoefs, coefs, sizeof(mCoefs)); - setState(STATE_NORMAL); - } else { - setState(STATE_TRANSITION_TO_NORMAL); - } - } -} - -void AudioBiquadFilter::process(const audio_sample_t in[], audio_sample_t out[], - int frameCount) { - (this->*mCurProcessFunc)(in, out, frameCount); -} - -void AudioBiquadFilter::enable(bool immediate) { - if (CC_UNLIKELY(immediate)) { - memcpy(mCoefs, mTargetCoefs, sizeof(mCoefs)); - setState(STATE_NORMAL); - } else { - setState(STATE_TRANSITION_TO_NORMAL); - } -} - -void AudioBiquadFilter::disable(bool immediate) { - if (CC_UNLIKELY(immediate)) { - memcpy(mCoefs, IDENTITY_COEFS, sizeof(mCoefs)); - setState(STATE_BYPASS); - } else { - setState(STATE_TRANSITION_TO_BYPASS); - } -} - -void AudioBiquadFilter::setState(state_t state) { - switch (state) { - case STATE_BYPASS: - mCurProcessFunc = &AudioBiquadFilter::process_bypass; - break; - case STATE_TRANSITION_TO_BYPASS: - if (mNumChannels == 1) { - mCurProcessFunc = &AudioBiquadFilter::process_transition_bypass_mono; - } else { - mCurProcessFunc = &AudioBiquadFilter::process_transition_bypass_multi; - } - mCoefDirtyBits = (1 << NUM_COEFS) - 1; - break; - case STATE_TRANSITION_TO_NORMAL: - if (mNumChannels == 1) { - mCurProcessFunc = &AudioBiquadFilter::process_transition_normal_mono; - } else { - mCurProcessFunc = &AudioBiquadFilter::process_transition_normal_multi; - } - mCoefDirtyBits = (1 << NUM_COEFS) - 1; - break; - case STATE_NORMAL: - if (mNumChannels == 1) { - mCurProcessFunc = &AudioBiquadFilter::process_normal_mono; - } else { - mCurProcessFunc = &AudioBiquadFilter::process_normal_multi; - } - break; - } - mState = state; -} - -bool AudioBiquadFilter::updateCoefs(const audio_coef_t coefs[NUM_COEFS], - int frameCount) { - int64_t maxDelta = mMaxDelta * frameCount; - for (int i = 0; i < NUM_COEFS; ++i) { - if (mCoefDirtyBits & (1<<i)) { - audio_coef_t diff = coefs[i] - mCoefs[i]; - if (diff > maxDelta) { - mCoefs[i] += maxDelta; - } else if (diff < -maxDelta) { - mCoefs[i] -= maxDelta; - } else { - mCoefs[i] = coefs[i]; - mCoefDirtyBits ^= (1<<i); - } - } - } - return mCoefDirtyBits == 0; -} - -void AudioBiquadFilter::process_bypass(const audio_sample_t * in, - audio_sample_t * out, - int frameCount) { - // The common case is in-place processing, because this is what the EQ does. - if (CC_UNLIKELY(in != out)) { - memcpy(out, in, frameCount * mNumChannels * sizeof(audio_sample_t)); - } -} - -void AudioBiquadFilter::process_normal_mono(const audio_sample_t * in, - audio_sample_t * out, - int frameCount) { - size_t nFrames = frameCount; - audio_sample_t x1 = mDelays[0][0]; - audio_sample_t x2 = mDelays[0][1]; - audio_sample_t y1 = mDelays[0][2]; - audio_sample_t y2 = mDelays[0][3]; - const audio_coef_t b0 = mCoefs[0]; - const audio_coef_t b1 = mCoefs[1]; - const audio_coef_t b2 = mCoefs[2]; - const audio_coef_t a1 = mCoefs[3]; - const audio_coef_t a2 = mCoefs[4]; - while (nFrames-- > 0) { - audio_sample_t x0 = *(in++); - audio_coef_sample_acc_t acc; - acc = mul_coef_sample(b0, x0); - acc = mac_coef_sample(b1, x1, acc); - acc = mac_coef_sample(b2, x2, acc); - acc = mac_coef_sample(a1, y1, acc); - acc = mac_coef_sample(a2, y2, acc); - audio_sample_t y0 = coef_sample_acc_to_sample(acc); - y2 = y1; - y1 = y0; - x2 = x1; - x1 = x0; - (*out++) = y0; - } - mDelays[0][0] = x1; - mDelays[0][1] = x2; - mDelays[0][2] = y1; - mDelays[0][3] = y2; -} - -void AudioBiquadFilter::process_transition_normal_mono(const audio_sample_t * in, - audio_sample_t * out, - int frameCount) { - if (updateCoefs(mTargetCoefs, frameCount)) { - setState(STATE_NORMAL); - } - process_normal_mono(in, out, frameCount); -} - -void AudioBiquadFilter::process_transition_bypass_mono(const audio_sample_t * in, - audio_sample_t * out, - int frameCount) { - if (updateCoefs(IDENTITY_COEFS, frameCount)) { - setState(STATE_NORMAL); - } - process_normal_mono(in, out, frameCount); -} - -void AudioBiquadFilter::process_normal_multi(const audio_sample_t * in, - audio_sample_t * out, - int frameCount) { - const audio_coef_t b0 = mCoefs[0]; - const audio_coef_t b1 = mCoefs[1]; - const audio_coef_t b2 = mCoefs[2]; - const audio_coef_t a1 = mCoefs[3]; - const audio_coef_t a2 = mCoefs[4]; - for (int ch = 0; ch < mNumChannels; ++ch) { - size_t nFrames = frameCount; - audio_sample_t x1 = mDelays[ch][0]; - audio_sample_t x2 = mDelays[ch][1]; - audio_sample_t y1 = mDelays[ch][2]; - audio_sample_t y2 = mDelays[ch][3]; - while (nFrames-- > 0) { - audio_sample_t x0 = *in; - audio_coef_sample_acc_t acc; - acc = mul_coef_sample(b0, x0); - acc = mac_coef_sample(b1, x1, acc); - acc = mac_coef_sample(b2, x2, acc); - acc = mac_coef_sample(a1, y1, acc); - acc = mac_coef_sample(a2, y2, acc); - audio_sample_t y0 = coef_sample_acc_to_sample(acc); - y2 = y1; - y1 = y0; - x2 = x1; - x1 = x0; - *out = y0; - in += mNumChannels; - out += mNumChannels; - } - mDelays[ch][0] = x1; - mDelays[ch][1] = x2; - mDelays[ch][2] = y1; - mDelays[ch][3] = y2; - in -= frameCount * mNumChannels - 1; - out -= frameCount * mNumChannels - 1; - } -} - -void AudioBiquadFilter::process_transition_normal_multi(const audio_sample_t * in, - audio_sample_t * out, - int frameCount) { - if (updateCoefs(mTargetCoefs, frameCount)) { - setState(STATE_NORMAL); - } - process_normal_multi(in, out, frameCount); -} - -void AudioBiquadFilter::process_transition_bypass_multi(const audio_sample_t * in, - audio_sample_t * out, - int frameCount) { - if (updateCoefs(IDENTITY_COEFS, frameCount)) { - setState(STATE_NORMAL); - } - process_normal_multi(in, out, frameCount); -} - -} |