87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <math.h>
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#include <time.h>
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#include "fifo.h"
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//input: FIFO
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void* input_fifo(void* data)
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{
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struct audio_data *audio = (struct audio_data *)data;
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int fd;
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int n = 0;
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signed char buf[1024];
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int tempr, templ, lo;
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int q, i;
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int t = 0;
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int size = 1024;
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int bytes = 0;
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int flags;
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struct timespec req = { .tv_sec = 0, .tv_nsec = 10000000 };
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fd = open(audio->source, O_RDONLY);
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flags = fcntl(fd, F_GETFL, 0);
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fcntl(fd, F_SETFL, flags | O_NONBLOCK);
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while (1) {
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bytes = read(fd, buf, sizeof(buf));
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if (bytes == -1) { //if no bytes read sleep 10ms and zero shared buffer
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nanosleep (&req, NULL);
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t++;
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if (t > 10) {
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for (i = 0; i < 2048; i++)audio->audio_out_l[i] = 0;
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for (i = 0; i < 2048; i++)audio->audio_out_r[i] = 0;
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t = 0;
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}
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} else { //if bytes read go ahead
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t = 0;
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for (q = 0; q < (size / 4); q++) {
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tempr = ( buf[ 4 * q + 3] << 2);
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lo = ( buf[4 * q + 2] >> 6);
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if (lo < 0)lo = abs(lo) + 1;
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if (tempr >= 0)tempr = tempr + lo;
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else tempr = tempr - lo;
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templ = ( buf[ 4 * q + 1] << 2);
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lo = ( buf[ 4 * q] >> 6);
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if (lo < 0)lo = abs(lo) + 1;
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if (templ >= 0)templ = templ + lo;
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else templ = templ - lo;
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if (audio->channels == 1) audio->audio_out_l[n] = (tempr +
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templ) /
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2;
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//stereo storing channels in buffer
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if (audio->channels == 2) {
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audio->audio_out_l[n] = templ;
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audio->audio_out_r[n] = tempr;
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}
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n++;
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if (n == 2048 - 1)n = 0;
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}
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}
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if (audio->terminate == 1) {
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close(fd);
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break;
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}
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}
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return 0;
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}
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