kc3-lang/SDL/test/loopwavequeue.c

Branch : - branch - v2.28 - tag -

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  Commit

• Author : Philipp Wiesemann
  Date : 2017-04-29 22:50:23
  Hash : 89499a08
  Message : Removed unused field in loopwavequeue program. Found by Cppcheck.

• test/loopwavequeue.c

• /*
    Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely.
  */
  
  /* Program to load a wave file and loop playing it using SDL sound queueing */
  
  #include <stdio.h>
  #include <stdlib.h>
  
  #ifdef __EMSCRIPTEN__
  #include <emscripten/emscripten.h>
  #endif
  
  #include "SDL.h"
  
  #if HAVE_SIGNAL_H
  #include <signal.h>
  #endif
  
  static struct
  {
      SDL_AudioSpec spec;
      Uint8 *sound;               /* Pointer to wave data */
      Uint32 soundlen;            /* Length of wave data */
  } wave;
  
  
  /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
  static void
  quit(int rc)
  {
      SDL_Quit();
      exit(rc);
  }
  
  static int done = 0;
  void
  poked(int sig)
  {
      done = 1;
  }
  
  void
  loop()
  {
  #ifdef __EMSCRIPTEN__
      if (done || (SDL_GetAudioStatus() != SDL_AUDIO_PLAYING)) {
          emscripten_cancel_main_loop();
      }
      else
  #endif
      {
          /* The device from SDL_OpenAudio() is always device #1. */
          const Uint32 queued = SDL_GetQueuedAudioSize(1);
          SDL_Log("Device has %u bytes queued.\n", (unsigned int) queued);
          if (queued <= 8192) {  /* time to requeue the whole thing? */
              if (SDL_QueueAudio(1, wave.sound, wave.soundlen) == 0) {
                  SDL_Log("Device queued %u more bytes.\n", (unsigned int) wave.soundlen);
              } else {
                  SDL_Log("Device FAILED to queue %u more bytes: %s\n", (unsigned int) wave.soundlen, SDL_GetError());
              }
          }
      }
  }
  
  int
  main(int argc, char *argv[])
  {
      char filename[4096];
  
      /* Enable standard application logging */
      SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
  
      /* Load the SDL library */
      if (SDL_Init(SDL_INIT_AUDIO) < 0) {
          SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
          return (1);
      }
  
      if (argc > 1) {
          SDL_strlcpy(filename, argv[1], sizeof(filename));
      } else {
          SDL_strlcpy(filename, "sample.wav", sizeof(filename));
      }
      /* Load the wave file into memory */
      if (SDL_LoadWAV(filename, &wave.spec, &wave.sound, &wave.soundlen) == NULL) {
          SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s\n", filename, SDL_GetError());
          quit(1);
      }
  
      wave.spec.callback = NULL;  /* we'll push audio. */
  
  #if HAVE_SIGNAL_H
      /* Set the signals */
  #ifdef SIGHUP
      signal(SIGHUP, poked);
  #endif
      signal(SIGINT, poked);
  #ifdef SIGQUIT
      signal(SIGQUIT, poked);
  #endif
      signal(SIGTERM, poked);
  #endif /* HAVE_SIGNAL_H */
  
      /* Initialize fillerup() variables */
      if (SDL_OpenAudio(&wave.spec, NULL) < 0) {
          SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open audio: %s\n", SDL_GetError());
          SDL_FreeWAV(wave.sound);
          quit(2);
      }
  
      /*static x[99999]; SDL_QueueAudio(1, x, sizeof (x));*/
  
      /* Let the audio run */
      SDL_PauseAudio(0);
  
      done = 0;
  
      /* Note that we stuff the entire audio buffer into the queue in one
         shot. Most apps would want to feed it a little at a time, as it
         plays, but we're going for simplicity here. */
      
  #ifdef __EMSCRIPTEN__
      emscripten_set_main_loop(loop, 0, 1);
  #else
      while (!done && (SDL_GetAudioStatus() == SDL_AUDIO_PLAYING))
      {
          loop();
  
          SDL_Delay(100);  /* let it play for awhile. */
      }
  #endif
  
      /* Clean up on signal */
      SDL_CloseAudio();
      SDL_FreeWAV(wave.sound);
      SDL_Quit();
      return 0;
  }
  
  /* vi: set ts=4 sw=4 expandtab: */