You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
39 lines
1.1 KiB
39 lines
1.1 KiB
/*
|
|
* Copyright (C) 2020 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 <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
void DecodeMLaw(int16_t *out, const uint8_t *in, size_t inSize) {
|
|
if (out != nullptr && in != nullptr) {
|
|
while (inSize > 0) {
|
|
inSize--;
|
|
int32_t x = *in++;
|
|
|
|
int32_t mantissa = ~x;
|
|
int32_t exponent = (mantissa >> 4) & 7;
|
|
int32_t segment = exponent + 1;
|
|
mantissa &= 0x0f;
|
|
|
|
int32_t step = 4 << segment;
|
|
|
|
int32_t abs = (0x80l << exponent) + step * mantissa + step / 2 - 4 * 33;
|
|
|
|
*out++ = (x < 0x80) ? -abs : abs;
|
|
}
|
|
}
|
|
}
|