libxmp replay bug

main.cpp

#include <SDL2/SDL.h>
#include <SDL2/SDL_audio.h>
#include "xmp.h"
#include "sndfile.h"
#include "stdlib.h"
#include "string.h"

#define SAMPLE_RATE 44100
#define CHANNELS 2



xmp_context xmpContext;

int random_int(int min, int max) {
  return min + rand() % (max+1 - min);
}

void SDL_Callback(void *uData, Uint8 *stream, int length) {
  if (length == 0) {
    return;
  }
  memset(stream, 0, length);
  int result = xmp_play_buffer(xmpContext, stream, length, 0);
  if (result != 0) {
    printf("Result = %i | Length = %i\n", result, length); fflush(stdout);
  }
}

long int getFileSize(char *myFile) {
  FILE* fp = fopen(myFile, "r");
  fseek(fp, 0L, SEEK_END);
  long int effectFileSize = ftell(fp);
  fclose(fp);
  return effectFileSize;
}

int maxSfx = 8;
const char *sfxFiles[] = {
    "/home/jgarcia/Desktop/game/genus/resources/sound_effects/SFX_bad_drop_block.wav",
    "/home/jgarcia/Desktop/game/genus/resources/sound_effects/SFX_explode_block.wav",
    "/home/jgarcia/Desktop/game/genus/resources/sound_effects/SFX_good_drop_block.wav",
    "/home/jgarcia/Desktop/game/genus/resources/sound_effects/SFX_move_block.wav",
    "/home/jgarcia/Desktop/game/genus/resources/sound_effects/SFX_option_select.wav",
    "/home/jgarcia/Desktop/game/genus/resources/sound_effects/SFX_rotate_block_left.wav",
    "/home/jgarcia/Desktop/game/genus/resources/sound_effects/SFX_rotate_block_right.wav",
    "/home/jgarcia/Desktop/game/genus/resources/sound_effects/SFX_score_combo.wav",
};

int maxModFiles = 12;
const char *modFiles[] = {
    "/home/jgarcia/Desktop/game/genus/resources/music_test/zalza-afternoon_pr0n.xm",
    "/home/jgarcia/Desktop/game/genus/resources/music_test/zalza-agnetas_telephone.xm",
    "/home/jgarcia/Desktop/game/genus/resources/music_test/zalza-alf2_zalza_edit.xm",
    "/home/jgarcia/Desktop/game/genus/resources/music_test/zalza-annas_silver_stick.xm",
    "/home/jgarcia/Desktop/game/genus/resources/music_test/zalza-arkanoid_rmx.xm",
    "/home/jgarcia/Desktop/game/genus/resources/music_test/zalza-bisv_rm.xm",
    "/home/jgarcia/Desktop/game/genus/resources/music_test/zalza-cph_rides_high.xm",
    "/home/jgarcia/Desktop/game/genus/resources/music_test/zalza-cp-knarkmix3.xm",
    "/home/jgarcia/Desktop/game/genus/resources/music_test/zalza-crusin_sicilia.xm",
    "/home/jgarcia/Desktop/game/genus/resources/music_test/zalza-erika_online.xm",
    "/home/jgarcia/Desktop/game/genus/resources/music_test/zalza-fly_bird_funktro.xm",
    "/home/jgarcia/Desktop/game/genus/resources/music_test/zalza-g_te_g_r_p_tivoli.xm"
};

void loadNewMod(const char *newModFile) {
  SDL_PauseAudio(1);
  SDL_Delay(50); // Let's be generous and let the other thread stop.

  printf("Loading mod file: %s\n", newModFile);

  xmp_end_smix(xmpContext);
  xmp_end_player(xmpContext);

  FILE *f = fopen(newModFile, "rb");
  fseek(f, 0, SEEK_END);
  long fileSize = ftell(f);
  fseek(f, 0, SEEK_SET);  //same as rewind(f);

  auto *fileData = (uint8_t *)malloc(fileSize);
  fread(fileData, fileSize, 1, f);
  fclose(f);

  int loadResult = xmp_load_module_from_memory(xmpContext, fileData, fileSize);
  if (loadResult < 0) {
    printf("ERROR:: Could not open %s! %i", newModFile, loadResult);
    return;
  }
//  printf("loadResult = %i\n", loadResult);

  struct xmp_module_info mi;
  xmp_get_module_info(xmpContext, &mi);
  printf("%s (%s)\n", mi.mod->name, mi.mod->type);

  xmp_start_smix(xmpContext, 4, maxSfx);

  for (int i = 0; i < maxSfx; i++) {
    char *sfxFile = strdup(sfxFiles[i]);
//    printf("xmp_smix_load_sample(%i, %s)\n", i,  sfxFile);
    int sfxLoadResult = xmp_smix_load_sample(xmpContext, i, sfxFile);
//    printf("SFX Load result: %i\n", sfxLoadResult);
  }

  xmp_start_player(xmpContext, SAMPLE_RATE,  0);

  SDL_PauseAudio(0);
}

int main(int argc, char *argv[]) {
  SDL_AudioSpec fmt;
  SDL_AudioSpec actual_fmt;
  int finished;
  int currentModFile = 0;

  struct xmp_frame_info fi;
  struct xmp_module_info mi;
  xmpContext = xmp_create_context();

  loadNewMod(modFiles[currentModFile]);

  /* initialize SDL audio and start playing */
  if (SDL_Init(SDL_INIT_AUDIO) < 0) {
    printf("could not initialize SDL: %s\n", SDL_GetError());
    exit(1);
  }

  fmt.freq = SAMPLE_RATE;
  fmt.format = AUDIO_S16;
  fmt.channels = CHANNELS;
  fmt.samples = 18; //BUFFER_SIZE >> 2;
  fmt.callback = SDL_Callback;
  fmt.userdata = xmpContext;

  /* open audio */
  if (SDL_OpenAudio(&fmt, &actual_fmt) < 0) {
    printf("could not open SDL audio: %s\n", SDL_GetError());
    exit(1);
  }

  // Play
  SDL_PauseAudio(0);

  finished = 0;
  int64_t counter = 0;

  int currentSfx = -1;
  while (!finished) {
    xmp_get_frame_info(xmpContext, &fi);
    xmp_get_module_info(xmpContext, &mi);

    if (counter % 1000 == 0) {
      currentModFile++;
      if (currentModFile > maxModFiles - 1) {
        currentModFile = 0;
      }
      loadNewMod(modFiles[currentModFile]);
    }

    if (counter % 100 == 0) {
      currentSfx++;

      if (currentSfx > maxSfx - 1) {
        currentSfx = 1;
      }
      xmp_smix_play_sample(xmpContext,  currentSfx, 60, 64, 0);
    }

    counter++;
    fflush(stdout);
    SDL_Delay(4);
  }

  SDL_CloseAudio();
  return 0;
}