blob: 55894e5fca0f4e7ab36e394058166c2f301590ac [file] [log] [blame]
//
// VerilogBoy simulator
// Copyright 2022 Wenting Zhang
//
// audiosim.cpp: Capture PDM output and pass through a filter then save to wave
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <assert.h>
#include <vector>
#include "cic.h"
#include "audiosim.h"
#include "waveheader.h"
AUDIOSIM::AUDIOSIM(void) {
initializeCicFilterStruct(3, DECIMATION_M, &filter_left);
initializeCicFilterStruct(3, DECIMATION_M, &filter_right);
pcm.clear();
bit_counter = 0;
byte_counter = 0;
bypass_counter = 0;
}
AUDIOSIM::~AUDIOSIM(void) {
}
void AUDIOSIM::save(char *fname) {
printf("Max: %d, min: %d\n", max, min);
save_wav(fname, pcm);
save_wav("bypass.wav", byp);
}
void AUDIOSIM::save_wav(char *fname, std::vector<int16_t> &pcm) {
uint8_t header[44];
waveheader(header, 48000, 16, pcm.size() / 2);
FILE *fp;
fp = fopen(fname, "wb+");
fwrite(header, 44, 1, fp);
fwrite(&pcm[0], pcm.size() * 2, 1, fp);
fclose(fp);
printf("Audio save to %s\n", fname);
}
void AUDIOSIM::apply(uint8_t left, uint8_t right) {
byte_left |= left << 7;
byte_right |= right << 7;
bit_counter++;
if (bit_counter < 8) {
byte_left >>= 1;
byte_right >>= 1;
}
else {
bit_counter = 0;
pdm_buffer_left[byte_counter] = byte_left;
pdm_buffer_right[byte_counter] = byte_right;
byte_counter++;
if (byte_counter == PDM_SAMPLE_SIZE * DECIMATION_M / 8) {
byte_counter = 0;
executeCicFilter(pdm_buffer_left, PDM_SAMPLE_SIZE * DECIMATION_M,
pcm_buffer_left, &filter_left);
executeCicFilter(pdm_buffer_right, PDM_SAMPLE_SIZE * DECIMATION_M,
pcm_buffer_right, &filter_right);
for (int i = 0; i < PDM_SAMPLE_SIZE; i++) {
pcm.push_back((int16_t)(pcm_buffer_left[i] / 64));
pcm.push_back((int16_t)(pcm_buffer_right[i] / 64));
if (pcm_buffer_left[i] > max)
max = pcm_buffer_left[i];
if (pcm_buffer_left[i] < min)
min = pcm_buffer_left[i];
}
}
}
}
void AUDIOSIM::bypass(int16_t left, int16_t right) {
bypass_counter++;
if (bypass_counter == DECIMATION_M) {
bypass_counter = 0;
byp.push_back(left);
byp.push_back(right);
}
}