我正在使用libSDL2的混音器播放我的项目中存储为wav文件的音频,但是我需要对音频数据进行一些信号处理,这需要我访问各个样本(即:作为双精度数组) )。
因此,我正在寻找一种从MixChunk检索样本或将双精度数组供入libSDL进行播放的方法。
这是我播放wav文件的代码示例:
#include <SDL2/SDL.h>
#include <SDL2/SDL_mixer.h>
#include <iostream>
int playSound(char path[],int channel) {
if (SDL_Init(SDL_INIT_AUDIO) < 0)
return -1;
// Initialize SDL_mixer
if (Mix_OpenAudio(22050,MIX_DEFAULT_FORMAT,2,4096) == -1)
return -1;
Mix_Chunk *wave = NULL;
wave = Mix_LoadWAV(path);
if (wave == NULL) {
std::cout << "Error: Could not load .wav file: " << path << std::endl;
return -1;
}
if (Mix_PlayChannel(channel,wave,0) == -1) {
std::cout << "Error: Could not play wav file (" << path << ") on channel "
<< channel << std::endl;
return -1;
}
while (Mix_Playing(channel)) {
printf("%i\n",wave->abuf);
}
Mix_FreeChunk(wave);
}
void initializeAudioDevice() {
if (SDL_Init(SDL_INIT_AUDIO) < 0)
printf("Error: Can't open audio device!\n");
if (Mix_OpenAudio(22050,256) == -1)
printf("Error: Failed to setup audio device!\n");
}
int main() {
initializeAudioDevice();
char path[] = "sound.wav";
playSound(path,1);
return 0;
}
如您所见,我试图打印出MixChunk-> abuf属性的内容,但这并没有给我示例。
谢谢您帮助我步入正轨。