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81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
/*****************************************************************************
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# #
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# uStreamer - Lightweight and fast MJPEG-HTTP streamer. #
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# #
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# Copyright (C) 2018-2024 Maxim Devaev <mdevaev@gmail.com> #
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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 3 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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# You should have received a copy of the GNU General Public License #
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# along with this program. If not, see <https://www.gnu.org/licenses/>. #
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# #
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*****************************************************************************/
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#include "au.h"
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#include <stdlib.h>
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#include "uslibs/tools.h"
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us_au_pcm_s *us_au_pcm_init(void) {
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us_au_pcm_s *pcm;
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US_CALLOC(pcm, 1);
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return pcm;
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}
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void us_au_pcm_destroy(us_au_pcm_s *pcm) {
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free(pcm);
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}
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void us_au_pcm_mix(us_au_pcm_s *dest, us_au_pcm_s *src) {
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const uz size = src->frames * US_RTP_OPUS_CH * 2; // 2 for 16 bit
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if (src->frames == 0) {
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return;
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} else if (dest->frames == 0) {
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memcpy(dest->data, src->data, size);
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dest->frames = src->frames;
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} else if (dest->frames == src->frames) {
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// https://stackoverflow.com/questions/12089662
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for (uz index = 0; index < size; ++index) {
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int a = dest->data[index];
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int b = src->data[index];
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int m;
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a += 32768;
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b += 32768;
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if ((a < 32768) && (b < 32768)) {
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m = a * b / 32768;
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} else {
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m = 2 * (a + b) - (a * b) / 32768 - 65536;
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}
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if (m == 65536) {
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m = 65535;
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}
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m -= 32768;
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dest->data[index] = m;
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}
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}
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}
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us_au_encoded_s *us_au_encoded_init(void) {
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us_au_encoded_s *enc;
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US_CALLOC(enc, 1);
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return enc;
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}
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void us_au_encoded_destroy(us_au_encoded_s *enc) {
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free(enc);
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}
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