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46 lines
1.1 KiB
46 lines
1.1 KiB
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stddef.h>
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#include <stdint.h>
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void DecodeALaw(int16_t *out, const uint8_t *in, size_t inSize) {
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if (out != nullptr && in != nullptr) {
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while (inSize > 0) {
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inSize--;
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int32_t x = *in++;
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int32_t ix = x ^ 0x55;
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ix &= 0x7f;
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int32_t iexp = ix >> 4;
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int32_t mant = ix & 0x0f;
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if (iexp > 0) {
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mant += 16;
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}
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mant = (mant << 4) + 8;
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if (iexp > 1) {
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mant = mant << (iexp - 1);
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}
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*out++ = (x > 127) ? mant : -mant;
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}
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}
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}
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