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/*
* Copyright 2014 The Emscripten Authors. All rights reserved.
* Emscripten is available under two separate licenses, the MIT license and the
* University of Illinois/NCSA Open Source License. Both these licenses can be
* found in the LICENSE file.
*/
#include <stdio.h>
#include <stdlib.h>
#include <SDL/SDL.h>
#include <SDL/SDL_mixer.h>
#include <assert.h>
#include <emscripten.h>
#include <math.h>
#include <sys/stat.h>
Mix_Chunk *sound;
void done() {
REPORT_RESULT(1);
}
void pan() {
static int frames = 0;
frames++;
float x = (sin(frames / 30.f) + 1) / 2;
int channel = 0;
int left = x * 255;
int right = (1 - x) * 255;
printf("%f %d %d\n", x, left, right);
int panning = Mix_SetPanning(channel, left, right);
assert(panning != 0);
if (frames > 30 * 10)
done();
}
int play() {
int channel = Mix_PlayChannel(-1, sound, -1);
assert(channel == 0);
pan();
return channel;
}
Mix_Chunk*
load(const char* filename)
{
struct stat info;
int result = stat(filename, &info);
char * bytes = malloc( info.st_size );
FILE * f = fopen( filename, "rb" );
fread( bytes, 1, info.st_size, f );
fclose(f);
SDL_RWops * ops = SDL_RWFromConstMem(bytes, info.st_size);
Mix_Chunk * chunk = Mix_LoadWAV_RW(ops, 0);
SDL_FreeRW(ops);
free(bytes);
return chunk;
}
int main(int argc, char **argv) {
SDL_Init(SDL_INIT_AUDIO);
int ret = Mix_OpenAudio(0, 0, 0, 0); // we ignore all these..
assert(ret == 0);
sound = load("the_entertainer.wav");
assert(sound);
int channel = play();
emscripten_set_main_loop(pan, 30, 0);
emscripten_run_script("element = document.createElement('input');"
"element.setAttribute('type', 'button');"
"element.setAttribute('value', 'replay!');"
"element.setAttribute('onclick', 'Module[\"_play\"]()');"
"document.body.appendChild(element);");
printf("you should hear the sound moving from left to right. press the button to replay!\n");
return 0;
}
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