diff options
Diffstat (limited to 'audiotest.cpp')
| -rw-r--r-- | audiotest.cpp | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/audiotest.cpp b/audiotest.cpp index f6b5a92..81c6d84 100644 --- a/audiotest.cpp +++ b/audiotest.cpp @@ -1,6 +1,7 @@ //emcc -o test.html main.cpp -O2 -s USE_SDL=2 #include <stdlib.h> +#include <iostream> #if defined(_MSC_VER) #include "SDL.h" @@ -16,19 +17,33 @@ #endif - void audiomixer(void *userdata, Uint8 *stream, int len) { + static int sample=0; + int volume=15000; + int samples = len / 4; short *buf = (short*)stream; int i; - for (i = 0; i < samples*2; i++) + for (i = 0; i < samples*2; i+=2) { - buf[i] = i * 655; + buf[i]=buf[i+1] = volume*sin(sample*440/4410/2); + if((sample/44100)%2==1)buf[i]=buf[i+1]=0; + buf[i]+=volume*sin(sample*261/4410/2); + sample++; } } +void show_AudioSpec(SDL_AudioSpec *as) +{ + std::cout << as->freq << std::endl; + std::cout << as->format << std::endl; + std::cout << as->channels << std::endl; + std::cout << as->samples << std::endl; + std::cout << as->callback << std::endl; +} + int sdlstatic_init(unsigned int aSamplerate, unsigned int aBuffer) { SDL_AudioSpec as; @@ -43,6 +58,11 @@ int sdlstatic_init(unsigned int aSamplerate, unsigned int aBuffer) { return -1; } + std::cout << "desired:" << std::endl; + show_AudioSpec(&as); + std::cout << "obtained:" << std::endl; + show_AudioSpec(&as2); + SDL_PauseAudio(0); @@ -77,13 +97,12 @@ void mainloop() int main(int argc, char *argv[]) { - printf("SDL INIT OK\n"); if ( SDL_Init(SDL_INIT_EVERYTHING) < 0 ) { fprintf(stderr, "Unable to init SDL: %s\n", SDL_GetError()); exit(1); } - printf("SDL INIT OK\n"); + std::cout << "SDL INIT OK" << std::endl; atexit(SDL_Quit); |