声音合成器 1 基本噪音

声音合成器 1 基本噪音

视频：​​ OneLoneCoder.com - Simple Audio Noisy Thing "Allows you to simply listen to that waveform!" - @Javidx9 License ~~~~~~~ Copyright (C) 2018 Javidx9 This program comes with ABSOLUTELY NO WARRANTY. This is free software, and you are welcome to redistribute it under certain conditions; See license for details. Original works located at: GNU GPLv3 From Javidx9 :) ~~~~~~~~~~~~~~~ Hello! Ultimately I don't care what you use this for. It's intended to be educational, and perhaps to the oddly minded - a little bit of fun. Please hack this, change it and use it in any way you see fit. You acknowledge that I am not responsible for anything bad that happens as a result of your actions. However this code is protected by GNU GPLv3, see the license in the github repo. This means you must attribute me if you use it. You can view this license here: Cheers! Author ~~~~~~ Twitter: @javidx9 Blog: onelonecoder.com Versions ~~~~~~~~ 1.0 - 14/01/17 - Controls audio output hardware behind the scenes so you can just focus on creating and listening to interesting waveforms. - Currently MS Windows only Documentation ~~~~~~~~~~~~~ See video: This will improve as it grows!*/#pragma once#pragma comment(lib, "winmm.lib")#include #include #include #include #include #include #include #include using namespace std;#include const double PI = 2.0 * acos(0.0);templateclass olcNoiseMaker{public: olcNoiseMaker(wstring sOutputDevice, unsigned int nSampleRate = 44100, unsigned int nChannels = 1, unsigned int nBlocks = 8, unsigned int nBlockSamples = 512) { Create(sOutputDevice, nSampleRate, nChannels, nBlocks, nBlockSamples); } ~olcNoiseMaker() { Destroy(); } bool Create(wstring sOutputDevice, unsigned int nSampleRate = 44100, unsigned int nChannels = 1, unsigned int nBlocks = 8, unsigned int nBlockSamples = 512) { m_bReady = false; m_nSampleRate = nSampleRate; m_nChannels = nChannels; m_nBlockCount = nBlocks; m_nBlockSamples = nBlockSamples; m_nBlockFree = m_nBlockCount; m_nBlockCurrent = 0; m_pBlockMemory = nullptr; m_pWaveHeaders = nullptr; m_userFunction = nullptr; // Validate device vector devices = Enumerate(); auto d = std::find(devices.begin(), devices.end(), sOutputDevice); if (d != devices.end()) { // Device is available int nDeviceID = distance(devices.begin(), d); WAVEFORMATEX waveFormat; waveFormat.wFormatTag = WAVE_FORMAT_PCM; waveFormat.nSamplesPerSec = m_nSampleRate; waveFormat.wBitsPerSample = sizeof(T) * 8; waveFormat.nChannels = m_nChannels; waveFormat.nBlockAlign = (waveFormat.wBitsPerSample / 8) * waveFormat.nChannels; waveFormat.nAvgBytesPerSec = waveFormat.nSamplesPerSec * waveFormat.nBlockAlign; waveFormat.cbSize = 0; // Open Device if valid if (waveOutOpen(&m_hwDevice, nDeviceID, &waveFormat, (DWORD_PTR)waveOutProcWrap, (DWORD_PTR)this, CALLBACK_FUNCTION) != S_OK) return Destroy(); } // Allocate Wave|Block Memory m_pBlockMemory = new T[m_nBlockCount * m_nBlockSamples]; if (m_pBlockMemory == nullptr) return Destroy(); ZeroMemory(m_pBlockMemory, sizeof(T) * m_nBlockCount * m_nBlockSamples); m_pWaveHeaders = new WAVEHDR[m_nBlockCount]; if (m_pWaveHeaders == nullptr) return Destroy(); ZeroMemory(m_pWaveHeaders, sizeof(WAVEHDR) * m_nBlockCount); // Link headers to block memory for (unsigned int n = 0; n < m_nBlockCount; n++) { m_pWaveHeaders[n].dwBufferLength = m_nBlockSamples * sizeof(T); m_pWaveHeaders[n].lpData = (LPSTR)(m_pBlockMemory + (n * m_nBlockSamples)); } m_bReady = true; m_thread = thread(&olcNoiseMaker::MainThread, this); // Start the ball rolling unique_lock lm(m_muxBlockNotZero); m_cvBlockNotZero.notify_one(); return true; } bool Destroy() { return false; } void Stop() { m_bReady = false; m_thread.join(); } // Override to process current sample virtual double UserProcess(double dTime) { return 0.0; } double GetTime() { return m_dGlobalTime; } public: static vector Enumerate() { int nDeviceCount = waveOutGetNumDevs(); vector sDevices; WAVEOUTCAPS woc; for (int n = 0; n < nDeviceCount; n++) if (waveOutGetDevCaps(n, &woc, sizeof(WAVEOUTCAPS)) == S_OK) sDevices.push_back(woc.szPname); return sDevices; } void SetUserFunction(double(*func)(double)) { m_userFunction = func; } double clip(double dSample, double dMax) { if (dSample >= 0.0) return fmin(dSample, dMax); else return fmax(dSample, -dMax); }private: double(*m_userFunction)(double); unsigned int m_nSampleRate; unsigned int m_nChannels; unsigned int m_nBlockCount; unsigned int m_nBlockSamples; unsigned int m_nBlockCurrent; T* m_pBlockMemory; WAVEHDR *m_pWaveHeaders; HWAVEOUT m_hwDevice; thread m_thread; atomic m_bReady; atomic m_nBlockFree; condition_variable m_cvBlockNotZero; mutex m_muxBlockNotZero; atomic m_dGlobalTime; // Handler for soundcard request for more data void waveOutProc(HWAVEOUT hWaveOut, UINT uMsg, DWORD dwParam1, DWORD dwParam2) { if (uMsg != WOM_DONE) return; m_nBlockFree++; unique_lock lm(m_muxBlockNotZero); m_cvBlockNotZero.notify_one(); } // Static wrapper for sound card handler static void CALLBACK waveOutProcWrap(HWAVEOUT hWaveOut, UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2) { ((olcNoiseMaker*)dwInstance)->waveOutProc(hWaveOut, uMsg, dwParam1, dwParam2); } // Main thread. This loop responds to requests from the soundcard to fill 'blocks' // with audio data. If no requests are available it goes dormant until the sound // card is ready for more data. The block is fille by the "user" in some manner // and then issued to the soundcard. void MainThread() { m_dGlobalTime = 0.0; double dTimeStep = 1.0 / (double)m_nSampleRate; // Goofy hack to get maximum integer for a type at run-time T nMaxSample = (T)pow(2, (sizeof(T) * 8) - 1) - 1; double dMaxSample = (double)nMaxSample; T nPreviousSample = 0; while (m_bReady) { // Wait for block to become available if (m_nBlockFree == 0) { unique_lock lm(m_muxBlockNotZero); m_cvBlockNotZero.wait(lm); } // Block is here, so use it m_nBlockFree--; // Prepare block for processing if (m_pWaveHeaders[m_nBlockCurrent].dwFlags & WHDR_PREPARED) waveOutUnprepareHeader(m_hwDevice, &m_pWaveHeaders[m_nBlockCurrent], sizeof(WAVEHDR)); T nNewSample = 0; int nCurrentBlock = m_nBlockCurrent * m_nBlockSamples; for (unsigned int n = 0; n < m_nBlockSamples; n++) { // User Process if (m_userFunction == nullptr) nNewSample = (T)(clip(UserProcess(m_dGlobalTime), 1.0) * dMaxSample); else nNewSample = (T)(clip(m_userFunction(m_dGlobalTime), 1.0) * dMaxSample); m_pBlockMemory[nCurrentBlock + n] = nNewSample; nPreviousSample = nNewSample; m_dGlobalTime = m_dGlobalTime + dTimeStep; } // Send block to sound device waveOutPrepareHeader(m_hwDevice, &m_pWaveHeaders[m_nBlockCurrent], sizeof(WAVEHDR)); waveOutWrite(m_hwDevice, &m_pWaveHeaders[m_nBlockCurrent], sizeof(WAVEHDR)); m_nBlockCurrent++; m_nBlockCurrent %= m_nBlockCount; } }};

二、开始制造噪音

这里有一些和声音采样有关的知识，当然不知道也不影响继续。

2.1 声音测试（建议把声音先调低点，运行后应该听到呜呜的噪声）

#include using namespace std;#include "olcNoiseMaker.h"double MakeNoise(double dTime){ return 0.5*sin(440.0 * 2 * 3.14159*dTime); //声音的频率440hz}int main(){ // Shameless self-promotion wcout << "OneLoneCoder.com - Synthesizer Part 1" << endl << "Single Sine Wave Oscillator, No Polyphony" << endl << endl; // Get all sound hardware vector devices = olcNoiseMaker::Enumerate(); // Display findings for (auto d : devices) wcout << "Found Output Device: " << d << endl; wcout << "Using Device: " << devices[0] << endl; //创建声音机器 olcNoiseMaker sound(devices[0], 44100, 1, 8, 512); //44100~奈奎斯特采样（记录的最高频率2倍）， sound.SetUserFunction(MakeNoise); while (1) { } return 0;}

2.2  控制声音

通过按键‘a’更改频率，来改变声音。

atomic dFreequencyOutput = 0.0; //原子类，用来保证多进程同步double MakeNoise(double dTime){ //方波 double dOutput = 1.0*sin(dFreequencyOutput * 2 * 3.14159*dTime); if (dOutput > 0.0) return 0.2; else return -0.2;}while (1) { //按键响应'a' if (GetAsyncKeyState('A') & 0x8000) { dFreequencyOutput = 440.0; } else { dFreequencyOutput = 0; } }

更准确一些可以将一个基本音分为12个组...

double dOctaveBaseFrequency = 110.0; // A2 // frequency of octave represented by keyboard double d12thRootOf2 = pow(2.0, 1.0 / 12.0); // assuming western 12 notes per ocatve while (1) { //按键响应'a' if (GetAsyncKeyState('A') & 0x8000) { dFreequencyOutput = dOctaveBaseFrequency * pow(d12thRootOf2,12); } else { dFreequencyOutput = 0; } }

然后利用16个键来控制不同的调。

bool bKeyPressed = false; for (int k = 0; k < 15; k++) { if (GetAsyncKeyState((unsigned char)("ZSXCFVGBNJMK\xbcL\xbe\xbf"[k])) & 0x8000) { dFreequencyOutput = dOctaveBaseFrequency * pow(d12thRootOf2, k); bKeyPressed = true; } } if(!bKeyPressed) { dFreequencyOutput = 0.0; }

2.3 完整代码，最后说的和弦没有做出来

#include using namespace std;#include "olcNoiseMaker.h"atomic dFreequencyOutput = 0.0; //原子类，用来保证多进程同步double MakeNoise(double dTime){ //方波 double dOutput = 1.0*sin(dFreequencyOutput * 2 * 3.14159*dTime); if (dOutput > 0.0) return 0.2; else return -0.2;}int main(){ // Shameless self-promotion wcout << "OneLoneCoder.com - Synthesizer Part 1" << endl << "Single Sine Wave Oscillator, No Polyphony" << endl << endl; // Get all sound hardware vector devices = olcNoiseMaker::Enumerate(); // Display findings for (auto d : devices) wcout << "Found Output Device: " << d << endl; wcout << "Using Device: " << devices[0] << endl; //创建声音机器 olcNoiseMaker sound(devices[0], 44100, 1, 8, 512); //44100~奈奎斯特采样（记录的最高频率2倍）， sound.SetUserFunction(MakeNoise); double dOctaveBaseFrequency = 110.0; // A2 // frequency of octave represented by keyboard double d12thRootOf2 = pow(2.0, 1.0 / 12.0); // assuming western 12 notes per ocatve while (1) { bool bKeyPressed = false; for (int k = 0; k < 15; k++) { if (GetAsyncKeyState((unsigned char)("ZSXCFVGBNJMK\xbcL\xbe\xbf"[k])) & 0x8000) { dFreequencyOutput = dOctaveBaseFrequency * pow(d12thRootOf2, k); bKeyPressed = true; } } if(!bKeyPressed) { dFreequencyOutput = 0.0; } } return 0;}

版权声明：本文内容由网络用户投稿，版权归原作者所有，本站不拥有其著作权，亦不承担相应法律责任。如果您发现本站中有涉嫌抄袭或描述失实的内容，请联系我们jiasou666@gmail.com 处理，核实后本网站将在24小时内删除侵权内容。