kc3-lang/SDL/test/testmultiaudio.c

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• Hash : 120c76c8
  Author :
  Date : 2022-01-03T09:40:00
  

  Updated copyright for 2022

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• test/testmultiaudio.c

• /*
    Copyright (C) 1997-2022 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.
  */
  #include "SDL.h"
  
  #include <stdio.h> /* for fflush() and stdout */
  
  #ifdef __EMSCRIPTEN__
  #include <emscripten/emscripten.h>
  #endif
  
  static SDL_AudioSpec spec;
  static Uint8 *sound = NULL;     /* Pointer to wave data */
  static Uint32 soundlen = 0;     /* Length of wave data */
  
  typedef struct
  {
      SDL_AudioDeviceID dev;
      int soundpos;
      SDL_atomic_t done;
  } callback_data;
  
  callback_data cbd[64];
  
  void SDLCALL
  play_through_once(void *arg, Uint8 * stream, int len)
  {
      callback_data *cbdata = (callback_data *) arg;
      Uint8 *waveptr = sound + cbdata->soundpos;
      int waveleft = soundlen - cbdata->soundpos;
      int cpy = len;
      if (cpy > waveleft)
          cpy = waveleft;
  
      SDL_memcpy(stream, waveptr, cpy);
      len -= cpy;
      cbdata->soundpos += cpy;
      if (len > 0) {
          stream += cpy;
          SDL_memset(stream, spec.silence, len);
          SDL_AtomicSet(&cbdata->done, 1);
      }
  }
  
  void
  loop()
  {
      if (SDL_AtomicGet(&cbd[0].done)) {
  #ifdef __EMSCRIPTEN__
          emscripten_cancel_main_loop();
  #endif
          SDL_PauseAudioDevice(cbd[0].dev, 1);
          SDL_CloseAudioDevice(cbd[0].dev);
          SDL_FreeWAV(sound);
          SDL_Quit();
      }
  }
  
  static void
  test_multi_audio(int devcount)
  {
      int keep_going = 1;
      int i;
      
  #ifdef __ANDROID__  
      SDL_Event event;
    
      /* Create a Window to get fully initialized event processing for testing pause on Android. */
      SDL_CreateWindow("testmultiaudio", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 320, 240, 0);
  #endif
  
      if (devcount > 64) {
          SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Too many devices (%d), clamping to 64...\n",
                  devcount);
          devcount = 64;
      }
  
      spec.callback = play_through_once;
  
      for (i = 0; i < devcount; i++) {
          const char *devname = SDL_GetAudioDeviceName(i, 0);
          SDL_Log("playing on device #%d: ('%s')...", i, devname);
          fflush(stdout);
  
          SDL_memset(&cbd[0], '\0', sizeof(callback_data));
          spec.userdata = &cbd[0];
          cbd[0].dev = SDL_OpenAudioDevice(devname, 0, &spec, NULL, 0);
          if (cbd[0].dev == 0) {
              SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Open device failed: %s\n", SDL_GetError());
          } else {
              SDL_PauseAudioDevice(cbd[0].dev, 0);
  #ifdef __EMSCRIPTEN__
              emscripten_set_main_loop(loop, 0, 1);
  #else
              while (!SDL_AtomicGet(&cbd[0].done)) {
                  #ifdef __ANDROID__                
                  /* Empty queue, some application events would prevent pause. */
                  while (SDL_PollEvent(&event)){}
                  #endif                
                  SDL_Delay(100);
              }
              SDL_PauseAudioDevice(cbd[0].dev, 1);
  #endif
              SDL_Log("done.\n");
              SDL_CloseAudioDevice(cbd[0].dev);
          }
      }
  
      SDL_memset(cbd, '\0', sizeof(cbd));
  
      SDL_Log("playing on all devices...\n");
      for (i = 0; i < devcount; i++) {
          const char *devname = SDL_GetAudioDeviceName(i, 0);
          spec.userdata = &cbd[i];
          cbd[i].dev = SDL_OpenAudioDevice(devname, 0, &spec, NULL, 0);
          if (cbd[i].dev == 0) {
              SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Open device %d failed: %s\n", i, SDL_GetError());
          }
      }
  
      for (i = 0; i < devcount; i++) {
          if (cbd[i].dev) {
              SDL_PauseAudioDevice(cbd[i].dev, 0);
          }
      }
  
      while (keep_going) {
          keep_going = 0;
          for (i = 0; i < devcount; i++) {
              if ((cbd[i].dev) && (!SDL_AtomicGet(&cbd[i].done))) {
                  keep_going = 1;
              }
          }
          #ifdef __ANDROID__        
          /* Empty queue, some application events would prevent pause. */
          while (SDL_PollEvent(&event)){}
          #endif        
  
          SDL_Delay(100);
      }
  
  #ifndef __EMSCRIPTEN__
      for (i = 0; i < devcount; i++) {
          if (cbd[i].dev) {
              SDL_PauseAudioDevice(cbd[i].dev, 1);
              SDL_CloseAudioDevice(cbd[i].dev);
          }
      }
  
      SDL_Log("All done!\n");
  #endif
  }
  
  
  int
  main(int argc, char **argv)
  {
      int devcount = 0;
  
      /* 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);
      }
  
      SDL_Log("Using audio driver: %s\n", SDL_GetCurrentAudioDriver());
      
      devcount = SDL_GetNumAudioDevices(0);
      if (devcount < 1) {
          SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Don't see any specific audio devices!\n");
      } else {
          const char *file = (argc < 2) ? "sample.wav" : argv[1];
  
          /* Load the wave file into memory */
          if (SDL_LoadWAV(file, &spec, &sound, &soundlen) == NULL) {
              SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s\n", file,
                      SDL_GetError());
          } else {
              test_multi_audio(devcount);
              SDL_FreeWAV(sound);
          }
      }
  
      SDL_Quit();
      return 0;
  }
  

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