Plays OGG in infinite loop with SDL_mixer

sdl_mixer_stream_ogg_with_loop.cpp

#include <iostream>
#include <SDL.h>
#include <SDL_mixer.h>
#include <vorbis/vorbisfile.h>

using namespace std;
int main(int, char **) {
  SDL_Init(SDL_INIT_EVERYTHING);
  atexit(SDL_Quit);
  Mix_Init(MIX_INIT_FLAC | MIX_INIT_OGG);
  atexit(Mix_Quit);

  Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, MIX_DEFAULT_CHANNELS,
                1024);
  atexit(Mix_CloseAudio);

  auto window = SDL_CreateWindow(
      "Test",
      SDL_WINDOWPOS_UNDEFINED,
      SDL_WINDOWPOS_UNDEFINED,
      800,
      600,
      SDL_WINDOW_ALLOW_HIGHDPI);

  auto renderer = SDL_CreateRenderer(window, -1, 0);

  OggVorbis_File vf;
  ov_fopen("./songs/2.04. Heartbeat, Heartbreak.ogg", &vf);

  Mix_HookMusic([](void *udata, Uint8 *stream, int len) {
    OggVorbis_File *pvf = (OggVorbis_File *) udata;
    const long int start_loop = 447151L;
    const long int end_loop = 3410688L;
    int bitstream;
    int read_total = 0;
    while (true) {
      if (read_total >= len) break;
      auto pos = ov_pcm_tell(pvf);

      if (pos > end_loop)
        ov_pcm_seek(pvf, start_loop);

      int read = ov_read(pvf, (char *) stream + read_total,
                         len - read_total, 0, 2, 1, &bitstream);
      read_total += read;
    }

  }, &vf);

  while (true) {
    SDL_Event event;
    if (SDL_PollEvent(&event)) {
      if (event.type == SDL_QUIT)
        break;
    }
    SDL_RenderClear(renderer);

    SDL_RenderPresent(renderer);
    SDL_Delay(1);
  }

  ov_clear(&vf);
  return 0;
}