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mixer.c
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mixer.c
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/**
* @file test-snd-mixing2.c
* @author Bram Vlerick <bravl@linux-y9rj>
* @date Wed Oct 23 14:49:37 2019
*
* @brief Mixing Algorithm test
*
* Test of 3 mixing algorithms designed by:
* - Dr. Catteau Benoit <[email protected]>
* - Bram Vlerick <[email protected]>
*/
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <stdint.h>
#include <time.h>
#include "wave.h"
#include "mixer_lut.h"
#define MAX(a, b) ((a) > (b) ? a : b)
#define MIN(a, b) ((a) < (b) ? a : b)
#define NUMBER_OF_STREAMS 16u
/* static uint8_t volumes_l[NUMBER_OF_STREAMS] = { */
/* 25,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, */
/* }; */
static uint8_t volumes_l[NUMBER_OF_STREAMS] = {
255,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
};
static char filenames[NUMBER_OF_STREAMS][200] = {
"samples/auA01",
"samples/auA02",
"samples/auA03",
"samples/auA04",
"samples/auA05",
"samples/auA06",
"samples/auA07",
"samples/auA08",
"samples/auA09",
"samples/auA10",
"samples/auA11",
"samples/auA12",
"samples/auA13",
"samples/auA14",
"samples/auA15",
"samples/auA16",
};
int _get_min_chunk_size(struct wave_header_t *hdrs, int nr)
{
int min = INT_MAX;
for (int i = 0; i < nr; ++i) {
if (hdrs[i].subchunk2_size < min)
min = hdrs[i].subchunk2_size;
}
return min;
}
int main(void)
{
/* This will be the best code ever... */
int error = 0, retval = 0;
struct wave_header_t hdr[NUMBER_OF_STREAMS];
FILE *fp[NUMBER_OF_STREAMS] = { 0 };
char *mixed_buf = NULL;
for (int i = 0; i < NUMBER_OF_STREAMS; ++i) {
fp[i] = fopen(filenames[i], "rb");
if (!fp[i]) {
printf("Failed to open %s\n", filenames[i]);
for (int j = i - 1; j >= 0; j++) {
fclose(fp[j]);
}
return -1;
}
}
FILE *dump = fopen("dump-lut.hex", "wb");
if (!dump) {
printf("Dump.hex open failed\n");
retval = -1;
goto _close;
}
for (int i = 0; i < NUMBER_OF_STREAMS; ++i) {
error = wave_header_parse(fp[i], &hdr[i]);
if (error < 0) {
printf("Parse of %s failed\n", filenames[i]);
retval = error;
goto _close;
}
}
char *audio_data[NUMBER_OF_STREAMS] = { 0 };
for (int i = 0; i < NUMBER_OF_STREAMS; ++i) {
audio_data[i] = (char *)malloc(hdr[i].subchunk2_size);
if (!audio_data[i]) {
retval = -1;
goto _close;
}
int n = fread(audio_data[i], sizeof(char), hdr[i].subchunk2_size, fp[i]);
if (n < 0) {
printf("Read of %s failed\n", filenames[i]);
retval = -1;
goto _close;
}
}
int min_chunk_size = _get_min_chunk_size(hdr, NUMBER_OF_STREAMS);
mixed_buf = (char *)malloc(min_chunk_size);
if (!mixed_buf) {
retval = -1;
goto _close;
}
/* Time this part */
/* NO DIVIDE FIX LUTLUTLUT */
clock_t begin = clock();
double mean_time = 0;
int count = 0;
for (int x = 0; x < 10; x++) {
for (int i = 0; i < min_chunk_size; i += 2) {
int64_t sample = 0;
int16_t a = 0;
for (int j = 0; j < NUMBER_OF_STREAMS; ++j) {
/* Char array to S16_LE */
int16_t sx = audio_data[j][i + 1] << 8;
sx += audio_data[j][i];
/* Calculate the volume controlled sample */
int32_t sxv = (sx * volumes_l[j]) >> 8;
/* Apply mixing factor (Now same as volume) */
sample += (sxv * volumes_l[j]);
/* Calculate the mixing alfa */
a += volumes_l[j];
}
/* Perform mixing using LUT for final mixing factor using fixed point */
/* To remove the fixed point comma (Fucking fixed point shit) */
/* Division should be >> 16 but due to (a >> 6) addressing we change the */
/* fixed point comma resulting in a division >> 18 */
/* (Damn fixed point rubbish) */
sample = (sample * mixer_lut[a >> 6]) >> 18;
/* Reconvert to character array */
mixed_buf[i + 1] = (char)((sample & 0xff00) >> 8);
mixed_buf[i] = (char)(sample & 0x00ff);
if (i % 512 == 0) {
clock_t end = clock();
double time = (double)(end - begin) / CLOCKS_PER_SEC;
mean_time += time;
count++;
begin = clock();
}
}
}
mean_time *= 1000; // miliseconds
mean_time *= 1000; // microseconds
printf("LUT: Execution time: %lf usec\n", mean_time / count);
fwrite(mixed_buf, sizeof(char), min_chunk_size, dump);
_close:
for (int i = 0; i < NUMBER_OF_STREAMS; ++i) {
if (fp[i])
fclose(fp[i]);
if (audio_data[i])
free(audio_data[i]);
}
if (dump)
fclose(dump);
if (mixed_buf)
free(mixed_buf);
return retval;
}