From 65ab47156e1c7dfcd8cc4266253a5ff30219e7f0 Mon Sep 17 00:00:00 2001
From: Mathias Agopian <mathias@google.com>
Date: Wed, 14 Jul 2010 17:59:35 -0700
Subject: move native services under services/

moved surfaceflinger, audioflinger, cameraservice

all native services should now reside in this location.

Change-Id: Iee42b83dd2a94c3bf5107ab0895fe2dfcd5337a8
---
 services/audioflinger/AudioResamplerSinc.h | 88 ++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 services/audioflinger/AudioResamplerSinc.h

(limited to 'services/audioflinger/AudioResamplerSinc.h')

diff --git a/services/audioflinger/AudioResamplerSinc.h b/services/audioflinger/AudioResamplerSinc.h
new file mode 100644
index 0000000..e6cb90b
--- /dev/null
+++ b/services/audioflinger/AudioResamplerSinc.h
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2007 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 ANDROID_AUDIO_RESAMPLER_SINC_H
+#define ANDROID_AUDIO_RESAMPLER_SINC_H
+
+#include <stdint.h>
+#include <sys/types.h>
+#include <cutils/log.h>
+
+#include "AudioResampler.h"
+
+namespace android {
+
+// ----------------------------------------------------------------------------
+
+class AudioResamplerSinc : public AudioResampler {
+public:
+    AudioResamplerSinc(int bitDepth, int inChannelCount, int32_t sampleRate);
+
+    ~AudioResamplerSinc();
+
+    virtual void resample(int32_t* out, size_t outFrameCount,
+            AudioBufferProvider* provider);
+private:
+    void init();
+
+    template<int CHANNELS>
+    void resample(int32_t* out, size_t outFrameCount,
+            AudioBufferProvider* provider);
+
+    template<int CHANNELS>
+    inline void filterCoefficient(
+            int32_t& l, int32_t& r, uint32_t phase, int16_t const *samples);
+
+    template<int CHANNELS>
+    inline void interpolate(
+            int32_t& l, int32_t& r,
+            int32_t const* coefs, int16_t lerp, int16_t const* samples);
+
+    template<int CHANNELS>
+    inline void read(int16_t*& impulse, uint32_t& phaseFraction,
+            int16_t const* in, size_t inputIndex);
+
+    int16_t *mState;
+    int16_t *mImpulse;
+    int16_t *mRingFull;
+
+    int32_t const * mFirCoefs;
+    static const int32_t mFirCoefsDown[];
+    static const int32_t mFirCoefsUp[];
+
+    // ----------------------------------------------------------------------------
+    static const int32_t RESAMPLE_FIR_NUM_COEF       = 8;
+    static const int32_t RESAMPLE_FIR_LERP_INT_BITS  = 4;
+
+    // we have 16 coefs samples per zero-crossing
+    static const int coefsBits = RESAMPLE_FIR_LERP_INT_BITS;        // 4
+    static const int cShift = kNumPhaseBits - coefsBits;            // 26
+    static const uint32_t cMask  = ((1<<coefsBits)-1) << cShift;    // 0xf<<26 = 3c00 0000
+
+    // and we use 15 bits to interpolate between these samples
+    // this cannot change because the mul below rely on it.
+    static const int pLerpBits = 15;
+    static const int pShift = kNumPhaseBits - coefsBits - pLerpBits;    // 11
+    static const uint32_t pMask  = ((1<<pLerpBits)-1) << pShift;    // 0x7fff << 11
+
+    // number of zero-crossing on each side
+    static const unsigned int halfNumCoefs = RESAMPLE_FIR_NUM_COEF;
+};
+
+// ----------------------------------------------------------------------------
+}; // namespace android
+
+#endif /*ANDROID_AUDIO_RESAMPLER_SINC_H*/
-- 
cgit v1.1