Refactor to support playing sounds other than main song through FFT

use miniaudio's resource manager and engine to have cleaner and easier
switching between formats.

examples/simple_example.c

@@ -62,11 +62,12 @@ int main(int argc, char* argv[]) {
  fft = jum_initFFT(freqs, NUM_FREQS, weights, NUM_WEIGHTS, FFT_BUF_SIZE, NUM_BINS);
  audio = jum_initAudio(FFT_BUF_SIZE * (PREDECODE_BUFS + 5), PREDECODE_BUFS, FFT_BUF_SIZE);
 
+ if (jum_openPlaybackDevice(audio, -1) != 0) {
+ printf("failed to start playback\n");
+ return -1;
+ }
+
  if (playback) {
- if (jum_startPlayback(audio, filepath, -1) != 0) {
- printf("failed to start playback\n");
- return -1;
- }
  } else {
  printf("Capture Devices\n");
  for (i = 0; i < audio->capture_device_count; ++i) {
@@ -81,7 +82,7 @@ int main(int argc, char* argv[]) {
  }
  printf("%d: %s \n", input, audio->capture_device_info[input].name);
 
- if (jum_startCapture(audio, input) != 0) {
+ if (jum_openCaptureDevice(audio, input) != 0) {
  printf("failed to start capture\n");
  return -1;
  }
@@ -93,32 +94,6 @@ int main(int argc, char* argv[]) {
  float amplitude = 1;
  while (1) {
  start = SDL_GetTicks();
- // printf("frame time: %dms\n", msec);
- if (SDL_PollEvent(&event) && (event.type == SDL_KEYDOWN)) {
- switch (event.key.keysym.sym) {
- case SDLK_LEFT:
- jum_pausePlayback(audio);
- break;
- case SDLK_RIGHT:
- jum_resumePlayback(audio);
- break;
- case SDLK_UP:
- amplitude += 0.1;
- printf("amplitude: %f\n", amplitude);
- jum_setAmplitude(audio, amplitude);
- break;
- case SDLK_DOWN:
- amplitude -= 0.1;
- printf("amplitude: %f\n", amplitude);
- jum_setAmplitude(audio, amplitude);
- break;
- default:
- done = true;
- break;
- }
- if(done)
- break;
- }
 
  jum_analyze(fft, audio, delta);
  SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
@@ -129,7 +104,7 @@ int main(int argc, char* argv[]) {
  WINDOW_HEIGHT - WINDOW_HEIGHT * (fft->result[i]));
  }
  SDL_RenderDrawLine(renderer, 0, 0, fft->level * NUM_BINS, 0);
- SDL_RenderDrawLine(renderer, 0, WINDOW_HEIGHT - 1, jum_getCursor(audio) * NUM_BINS,
+ SDL_RenderDrawLine(renderer, 0, WINDOW_HEIGHT - 1, jum_getSongCursor(audio),
  WINDOW_HEIGHT - 1);
  SDL_RenderPresent(renderer);
  delta = SDL_GetTicks() - start;