mirror of
https://github.com/alsa-project/alsa-utils
synced 2024-09-19 17:49:59 +02:00
09cb66f40c
Aligning the data type of fftw analyzer, sample converter and other components on float, because: 1. avoid unnecessary data type conversion; 2. using float is more efficient than using double; 3. the extra double accuracy is not required. Signed-off-by: Lu, Han <han.lu@intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
114 lines
2.5 KiB
C
114 lines
2.5 KiB
C
/*
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* Copyright (C) 2013-2015 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <stdio.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdint.h>
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void convert_uint8_to_float(void *buf, float *val, int samples)
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{
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int i;
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for (i = 0; i < samples; i++)
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val[i] = ((uint8_t *) buf)[i];
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}
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void convert_int16_to_float(void *buf, float *val, int samples)
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{
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int i;
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for (i = 0; i < samples; i++)
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val[i] = ((int16_t *) buf)[i];
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}
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void convert_int24_to_float(void *buf, float *val, int samples)
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{
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int i;
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int32_t tmp;
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for (i = 0; i < samples; i++) {
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tmp = ((uint8_t *) buf)[i * 3 + 2] << 24;
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tmp |= ((uint8_t *) buf)[i * 3 + 1] << 16;
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tmp |= ((uint8_t *) buf)[i * 3] << 8;
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tmp >>= 8;
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val[i] = tmp;
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}
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}
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void convert_int32_to_float(void *buf, float *val, int samples)
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{
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int i;
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for (i = 0; i < samples; i++)
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val[i] = ((int32_t *) buf)[i];
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}
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void convert_float_to_uint8(float *val, void *buf, int samples, int channels)
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{
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int i, c, idx;
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for (i = 0; i < samples; i++) {
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for (c = 0; c < channels; c++) {
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idx = i * channels + c;
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((uint8_t *) buf)[idx] = (uint8_t) val[idx];
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}
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}
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}
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void convert_float_to_int16(float *val, void *buf, int samples, int channels)
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{
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int i, c, idx;
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for (i = 0; i < samples; i++) {
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for (c = 0; c < channels; c++) {
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idx = i * channels + c;
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((int16_t *) buf)[idx] = (int16_t) val[idx];
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}
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}
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}
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void convert_float_to_int24(float *val, void *buf, int samples, int channels)
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{
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int i, c, idx_f, idx_i;
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int32_t val_f_i;
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for (i = 0; i < samples; i++) {
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for (c = 0; c < channels; c++) {
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idx_f = i * channels + c;
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idx_i = 3 * idx_f;
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val_f_i = (int32_t) val[idx_f];
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((int8_t *) buf)[idx_i + 0] =
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(int8_t) (val_f_i & 0xff);
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((int8_t *) buf)[idx_i + 1] =
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(int8_t) ((val_f_i >> 8) & 0xff);
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((int8_t *) buf)[idx_i + 2] =
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(int8_t) ((val_f_i >> 16) & 0xff);
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}
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}
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}
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void convert_float_to_int32(float *val, void *buf, int samples, int channels)
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{
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int i, c, idx;
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for (i = 0; i < samples; i++) {
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for (c = 0; c < channels; c++) {
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idx = i * channels + c;
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((int32_t *) buf)[idx] = (int32_t) val[idx];
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}
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}
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}
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