blob: af9ab40c5869d61801849579c0514aa49ad48791 [file] [log] [blame]
/*
* Copyright (C) 2011 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 <audio_utils/primitives.h>
void ditherAndClamp(int32_t* out, int32_t const *sums, size_t c)
{
size_t i;
for (i=0 ; i<c ; i++) {
int32_t l = *sums++;
int32_t r = *sums++;
int32_t nl = l >> 12;
int32_t nr = r >> 12;
l = clamp16(nl);
r = clamp16(nr);
*out++ = (r<<16) | (l & 0xFFFF);
}
}
void memcpy_to_i16_from_u8(int16_t *dst, const uint8_t *src, size_t count)
{
dst += count;
src += count;
while (count--) {
*--dst = (int16_t)(*--src - 0x80) << 8;
}
}
void memcpy_to_u8_from_i16(uint8_t *dst, const int16_t *src, size_t count)
{
while (count--) {
*dst++ = (*src++ >> 8) + 0x80;
}
}
void downmix_to_mono_i16_from_stereo_i16(int16_t *dst, const int16_t *src, size_t count)
{
while (count--) {
*dst++ = (int16_t)(((int32_t)src[0] + (int32_t)src[1]) >> 1);
src += 2;
}
}
void upmix_to_stereo_i16_from_mono_i16(int16_t *dst, const int16_t *src, size_t count)
{
while (count--) {
int32_t temp = *src++;
dst[0] = temp;
dst[1] = temp;
dst += 2;
}
}