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offline_freqbuilder.h
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offline_freqbuilder.h
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//
// Created by admin on 2022/7/9.
//
#ifndef MIDILIB_OFFLINE_FREQBUILDER_H
#define MIDILIB_OFFLINE_FREQBUILDER_H
#include "offline.h"
#include "freq.hpp"
namespace mgnr::offline_render {
inline void render(const std::string &midi,
const char *sf,
int sampleRate,
const std::function<void(const float *, mgnr::offline &)> &callback) {
::__android_log_print(ANDROID_LOG_INFO, "offline_render","render");
mgnr::offline renderer(sf, sampleRate);
renderer.loadMidi(midi);
float buf[64];
::__android_log_print(ANDROID_LOG_INFO, "offline_render","render start...");
renderer.updateTimeMax();
while (renderer.renderStep(buf)) {
callback(buf, renderer);
}
}
inline void getFreq(const std::string &midi,
const char *sf,
int sampleRate,
int fftSize,
int skip,//处理时跳过帧
int blockNum,//每一次有多少个block，剩下的补0
const std::function<void(const sinrivUtils::cmplx *,
mgnr::offline &)> &callback) {
if (blockNum <= 0) {
return;
}
::__android_log_print(ANDROID_LOG_INFO, "offline_render","getFreq");
sinrivUtils::cmplx fftBuffer[fftSize];
sinrivUtils::cmplx fftBuffer_out[fftSize];
float window[fftSize];
//窗函数
for (int i = 0; i < fftSize; ++i) {
window[i] = (1.0 - 0.46) - (0.46 * cos(2.0 * M_PI * i / (fftSize - 1.0)));
}
int dataNum = blockNum * 64;
if (dataNum <= fftSize) {
//计算左右的空白
int padLeft, padRight;
if (dataNum == fftSize) {
padLeft = 0;
padRight = 0;
} else {
padLeft = (fftSize - dataNum) / 2;
padRight = fftSize - padLeft - dataNum;
}
//构建数组缓冲
std::list<float *> dataBuff;
for (int i = 0; i < blockNum; ++i) {
auto ptr = new float[64];
for (int j = 0; j < 64; ++j) {
ptr[j] = 0;
}
dataBuff.push_back(ptr);
}
//渲染
int frameId = 0;
render(midi, sf, sampleRate, [&](const float *buffer, mgnr::offline &renderer) {
//填充数组
auto dataBuff_it = dataBuff.begin();
if (dataBuff_it != dataBuff.end()) {
float *ptr = *dataBuff_it;
dataBuff.erase(dataBuff_it);
dataBuff.push_back(ptr);
for (int i = 0; i < 64; ++i) {
ptr[i] = buffer[i];
}
}
if (frameId % skip == 0) {
//构造输入
int index = 0;
//补充左边
for (int i = 0; i < padLeft; ++i) {
fftBuffer[index].r = 0;
fftBuffer[index].i = 0;
++index;
}
//填充数据
for (auto &it:dataBuff) {
for (int j = 0; j < 64; ++j) {
fftBuffer[index].r = it[j];
fftBuffer[index].i = 0;
++index;
}
}
//补充右边
for (int i = 0; i < padRight; ++i) {
fftBuffer[index].r = 0;
fftBuffer[index].i = 0;
++index;
}
//加窗
for (int i = 0; i < fftSize; ++i) {
fftBuffer[i].r *= window[i];
}
//执行变换
sinrivUtils::FFT(fftBuffer, fftBuffer_out, fftSize);
callback(fftBuffer_out, renderer);
}
++frameId;
});
//释放空间
for (auto &it:dataBuff) {
delete[] it;
}
}
}
inline void getMidiMap(const std::string &midi,
const char *sf,
int sampleRate,
int fftSize,
int skip,//处理时跳过帧
int blockNum,//每一次有多少个block，剩下的补0
float minFreq,//频谱被标记的阈值
const std::function<void(const float *, const int *,
mgnr::offline &)> &callback) {
::__android_log_print(ANDROID_LOG_INFO, "offline_render","getMidiMap");
float midiBuffer[512];
int tag[512];
int midiMapper_begin[512];
int midiMapper_end[512];
//计算midi132位置
double midi132 = 440. * pow(2., (132. - 57.) / 12.) * fftSize / sampleRate;
//计算映射关系
const int idx_max = fftSize / 2 - 1;
for (int idx = 0; idx < 512; ++idx) {
int pos_begin = midi132 * pow(2, ((idx - 0.5) / 4.0 - 132.0) / 12.0);
int pos_end = midi132 * pow(2, ((idx + 0.5) / 4.0 - 132.0) / 12.0);
if (pos_begin < 0) {
pos_begin = 0;
}
if (pos_end < 0) {
pos_end = 0;
}
if (pos_begin > idx_max) {
pos_begin = idx_max;
}
if (pos_end > idx_max) {
pos_end = idx_max;
}
midiMapper_begin[idx] = pos_begin;
midiMapper_end[idx] = pos_end;
}
getFreq(midi, sf, sampleRate, fftSize, skip, blockNum,
[&](const sinrivUtils::cmplx *buffer, mgnr::offline &renderer) {
//::__android_log_print(ANDROID_LOG_INFO, "offline_render","render freq map");
bzero(midiBuffer, sizeof(midiBuffer));
bzero(tag, sizeof(tag));
for (int idx = 0; idx < 512; ++idx) {
int begin = midiMapper_begin[idx];
int end = midiMapper_end[idx];
if (begin < idx_max) {
//区间中取最大的
float maxTone = 0;
for (int i = begin; i <= end; ++i) {
float toneAbs =
buffer[i].r * buffer[i].r + buffer[i].i * buffer[i].i;
if (toneAbs > maxTone) {
maxTone = toneAbs;
}
}
midiBuffer[idx] = sqrt(maxTone);
}
}
//计算实际的频谱
for (auto &it:renderer.playing) {
int begin = it->tone * 4;
int end = (it->tone + 1) * 4;
for (int i = begin; i < end; ++i) {
if (i >= 0 && i < 512 && midiBuffer[i] > minFreq) {
tag[i] = 1;//标记
}
}
}
callback(midiBuffer, tag, renderer);
});
}
inline void getMidiMap(const std::string &midi,
const char *sf,
int sampleRate,
int fftSize,
int skip,//处理时跳过帧
int blockNum,//每一次有多少个block，剩下的补0
float minFreq,//频谱被标记的阈值
const char *outPath
) {
auto fp = fopen(outPath, "w");
if (fp) {
getMidiMap(midi, sf, sampleRate, fftSize, skip, blockNum, minFreq,
[&](const float *freq, const int *tag, mgnr::offline &renderer) {
fprintf(fp, "%f", renderer.lookAtX / renderer.TPQ);
for (int i = 0; i < 512; ++i) {
fprintf(fp, ",%f:%d", freq[i], tag[i]);
}
fprintf(fp, "\n");
});
fclose(fp);
}
}
}
#endif //MIDILIB_OFFLINE_FREQBUILDER_H