2
我的目標是創建一個SDL窗口,繪製不同波形並播放此波的無限聲音。通過按特定鍵,可以修改波形的參數,如幅度,頻率或波形。使用SDL2播放正弦聲波 - 噪音/劃痕問題
問題是,即使是一個簡單的正弦波,看起來不錯,當繪製時,聽起來很嘈雜。我不明白爲什麼。
代碼:
#include "Graph.h"
#include <thread>
#include <iostream>
#include <sstream>
#include <string>
int main(int argc, char* argv[]){
Graph* g = new Graph();
int i;
std::cin >> i;
return 0;
}
int graphThreadFunc(void *pointer){
Graph* grid = (Graph*)pointer;
grid->init();
return 0;
}
// SDL calls this function whenever it wants its buffer to be filled with samples
void SDLAudioCallback(void *data, Uint8 *buffer, int length){
uint8_t *stream = (uint8_t*)buffer;
Graph* graph = (Graph*)data;
for (int i = 0; i <= length; i++){
if (graph->voice.audioLength <= 0)
stream[i] = graph->getSpec()->silence; // 128 is silence in a uint8 stream
else
{
stream[i] = graph->voice.getSample();
graph->voice.audioPosition++;
// Fill the graphBuffer with the first 1000 bytes of the wave for plotting
if (graph->graphPointer < 999)
graph->graphBuffer[graph->graphPointer++] = stream[i];
}
}
}
Graph::Graph()
{
// spawn thread
SDL_Thread *refresh_thread = SDL_CreateThread(graphThreadFunc, NULL, this);
}
SDL_AudioSpec* Graph::getSpec(){
return &this->spec;
}
void Graph::init()
{
// Init SDL & SDL_ttf
SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER);
SDL_zero(desiredDeviceSpec);
desiredDeviceSpec.freq = 44100; // Sample Rate
desiredDeviceSpec.format = AUDIO_U8; // Unsigned 8-Bit Samples
desiredDeviceSpec.channels = 1; // Mono
desiredDeviceSpec.samples = 2048; // The size of the Audio Buffer (in number of samples, eg: 2048 * 1 Byte (AUDIO_U8)
desiredDeviceSpec.callback = SDLAudioCallback;
desiredDeviceSpec.userdata = this;
dev = SDL_OpenAudioDevice(NULL, 0, &desiredDeviceSpec, &spec, SDL_AUDIO_ALLOW_FREQUENCY_CHANGE);
if (dev == 0) {
printf("\nFailed to open audio: %s\n", SDL_GetError());
}
else {
SDL_PauseAudioDevice(dev, 1); /* pause! */
SDL_PauseAudio(1);
}
// Create an application window with the following settings:
window = SDL_CreateWindow(
WINDOW_TITLE.c_str(), // window title
SDL_WINDOWPOS_UNDEFINED, // initial x position
SDL_WINDOWPOS_UNDEFINED, // initial y position
WINDOW_WIDTH, // width, in pixels
WINDOW_HEIGHT, // height, in pixels
SDL_WINDOW_SHOWN // flags - see below
);
// Check if the window was successfully created
if (window == NULL) {
// In case the window could not be created...
printf("Could not create window: %s\n", SDL_GetError());
return;
}
else{
voice.waveForm = Graph::Voice::WaveForm::SINE;
voice.amp = 120;
voice.frequency = 440;
SDL_PauseAudioDevice(dev, 1); // play
graphPointer = 0;
voice.audioLength = 44100;
voice.audioPosition = 0;
SDL_PauseAudioDevice(dev, 0); // play
SDL_Delay(200);
drawGraph();
mainLoop();
return;
}
}
void Graph::mainLoop()
{
while (thread_exit == 0){
SDL_Event event;
bool hasChanged = false;
while (SDL_PollEvent(&event)) {
switch (event.type)
{
case SDL_KEYDOWN:
{
hasChanged = true;
if (event.key.keysym.scancode == SDL_SCANCODE_SPACE){
//pause_thread = !pause_thread;
switch (voice.waveForm){
case Voice::SINE:
{
voice.waveForm = Graph::Voice::WaveForm::TRIANGLE;
break;
}
case Voice::TRIANGLE:
{
voice.waveForm = Graph::Voice::WaveForm::RECT;
break;
}
case Voice::RECT:
{
voice.waveForm = Graph::Voice::WaveForm::SAWTOOTH;
break;
}
case Voice::SAWTOOTH:
{
voice.waveForm = Graph::Voice::WaveForm::SINE;
break;
}
default:
break;
}
}
else if (event.key.keysym.scancode == SDL_SCANCODE_ESCAPE){
exit();
}
else if (event.key.keysym.scancode == SDL_SCANCODE_RETURN){
}
else if (event.key.keysym.scancode == SDL_SCANCODE_LEFT){
voice.frequency -= 2;
}
else if (event.key.keysym.scancode == SDL_SCANCODE_RIGHT){
voice.frequency += 2;
}
else if (event.key.keysym.scancode == SDL_SCANCODE_UP){
voice.amp += 2;
}
else if (event.key.keysym.scancode == SDL_SCANCODE_DOWN){
voice.amp -= 2;
}
else{
}
break;
}
case SDL_QUIT:
{
exit();
return;
break;
}
default: /* unhandled event */
break;
}
}
if (!pause_thread && hasChanged)
{
//SDL_PauseAudioDevice(dev, 1); // play
graphPointer = 0;
voice.audioLength = 44100;
voice.audioPosition = 0;
SDL_PauseAudioDevice(dev, 0); // play
SDL_Delay(200);
drawGraph();
}
//voice.waveForm = Voice::WaveForm::TRIANGLE;
//SDL_Delay(n); // delay the program to prevent the voice to be overridden before it has been played to the end
//SDL_PauseAudioDevice(dev, 1); // pause
SDL_Delay(REFRESH_INTERVAL);
//SDL_PauseAudioDevice(dev, 1); // pause
}
return;
}
void Graph::drawGraph()
{
SDL_Renderer *renderer = SDL_GetRenderer(window);
if (renderer == nullptr)
renderer = SDL_CreateRenderer(window, 0, SDL_RENDERER_ACCELERATED);
// Set background color
SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
// Clear winow
SDL_RenderClear(renderer);
SDL_SetRenderDrawColor(renderer, 22, 22, 22, 255);
for (int x = 0; x < WINDOW_WIDTH; x++){
uint8_t y = graphBuffer[x];
SDL_RenderDrawPoint(renderer, x, WINDOW_HEIGHT - y);
}
SDL_RenderPresent(renderer);
return;
}
void Graph::exit(){
thread_exit = 1;
// Close and destroy the window
SDL_DestroyWindow(window);
// Clean up
SDL_Quit();
}
uint8_t Graph::Voice::getSample(){
switch (waveForm){
case SINE:
{
float sineStep = 2 * M_PI * audioPosition * frequency/44100;
return (amp * sin(sineStep)) + 128;
break;
}
case RECT:
break;
case SAWTOOTH:
break;
case TRIANGLE:
break;
default:
return 0;
}
}
而頭文件:
#ifndef GRAPH_H
#define GRAPH_H
#include "SDL.h"
#include "SDL_audio.h"
#include <stdio.h>
#include <cmath>
#include <string>
#include <stack>
/* Constants */
const int REFRESH_INTERVAL = 50; // mseconds
const int WINDOW_WIDTH = 1000;
const int WINDOW_HEIGHT = 255;
const std::string WINDOW_TITLE = "Wave Graph";
class Graph
{
private:
SDL_Window *window; // Declare a pointer
// SDL audio stuff
SDL_AudioSpec desiredDeviceSpec;
SDL_AudioSpec spec;
SDL_AudioDeviceID dev;
int thread_exit = 0;
bool pause_thread = false;
public:
Graph();
void init();
void mainLoop();
void drawGraph();
void exit();
SDL_AudioSpec* getSpec();
struct Voice{
int frequency; // the frequency of the voice
int amp; // the amplitude of the voice
int audioLength; // number of samples to be played, eg: 1.2 seconds * 44100 samples per second
int audioPosition = 0; // counter
enum WaveForm{
SINE = 0, RECT = 1, SAWTOOTH = 2, TRIANGLE = 3
} waveForm;
uint8_t getSample();
} voice;
int graphPointer = 0;
uint8_t graphBuffer[1000];
};
#endif
我認爲你的正弦波幅度可能太低。它看起來像voice.amp是1,所以你的樣品只會在126和128之間變化。嘗試'(amp * sin(sineStep)* 128)+ 127;' – jaket
您好jaket,你是對的我忘記提及我最初將振幅設置爲更高的值(在100和128之間),但噪聲仍然存在。 – user66875
實際上你可能想使用127.當'sin'返回-1時,-1 * 128 + 127將是-1無符號並導致剪切。如果那不是,那你可能應該描述你聽到的噪音。它的正常定義可以在這裏聽到:https://en.wikipedia.org/wiki/White_noise。這是類似於正弦波在頂部還是更像是毛刺?如果毛刺是定期或隨機的? – jaket