kc3-lang/SDL/src/audio/nacl/SDL_naclaudio.c

Branch : - branch - v2.28 - tag -

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  Commit

• Author : Pierre-Loup A. Griffais
  Date : 2014-09-11 19:24:42
  Hash : 24c86b55
  Message : [X11] Reconcile logical keyboard state with physical state on FocusIn since the window system doesn't do it for us like other platforms. This prevents sticky keys and missed keys when going in and out of focus, for example Alt would appear to stick if switching away from an SDL app with Alt-Tab and had to be pressed again. CR: Sam

• src/audio/nacl/SDL_naclaudio.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2014 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, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  
  #include "../../SDL_internal.h"
  #include "SDL_naclaudio.h"
  
  #include "SDL_audio.h"
  #include "SDL_mutex.h"
  #include "../SDL_audiomem.h"
  #include "../SDL_audio_c.h"
  #include "../SDL_audiodev_c.h"
  
  #include "ppapi/c/pp_errors.h"
  #include "ppapi/c/pp_instance.h"
  #include "ppapi_simple/ps.h"
  #include "ppapi_simple/ps_interface.h"
  #include "ppapi_simple/ps_event.h"
  
  /* The tag name used by NACL audio */
  #define NACLAUD_DRIVER_NAME         "nacl"
  
  #define SAMPLE_FRAME_COUNT 4096
  
  /* Audio driver functions */
  static int NACLAUD_OpenDevice(_THIS, const char *devname, int iscapture);
  static void NACLAUD_CloseDevice(_THIS);
  static void nacl_audio_callback(void* samples, uint32_t buffer_size, PP_TimeDelta latency, void* data);
  
  /* FIXME: Make use of latency if needed */
  static void nacl_audio_callback(void* samples, uint32_t buffer_size, PP_TimeDelta latency, void* data) {
      SDL_AudioDevice* _this = (SDL_AudioDevice*) data;
      
      SDL_LockMutex(private->mutex);
  
      if (_this->enabled && !_this->paused) {
          if (_this->convert.needed) {
              SDL_LockMutex(_this->mixer_lock);
              (*_this->spec.callback) (_this->spec.userdata,
                                       (Uint8 *) _this->convert.buf,
                                       _this->convert.len);
              SDL_UnlockMutex(_this->mixer_lock);
              SDL_ConvertAudio(&_this->convert);
              SDL_memcpy(samples, _this->convert.buf, _this->convert.len_cvt);
          } else {
              SDL_LockMutex(_this->mixer_lock);
              (*_this->spec.callback) (_this->spec.userdata, (Uint8 *) samples, buffer_size);
              SDL_UnlockMutex(_this->mixer_lock);
          }
      } else {
          SDL_memset(samples, 0, buffer_size);
      }
      
      return;
  }
  
  static void NACLAUD_CloseDevice(SDL_AudioDevice *device) {
      const PPB_Core *core = PSInterfaceCore();
      const PPB_Audio *ppb_audio = PSInterfaceAudio();
      SDL_PrivateAudioData *hidden = (SDL_PrivateAudioData *) device->hidden;
      
      ppb_audio->StopPlayback(hidden->audio);
      SDL_DestroyMutex(hidden->mutex);
      core->ReleaseResource(hidden->audio);
  }
  
  static int
  NACLAUD_OpenDevice(_THIS, const char *devname, int iscapture) {
      PP_Instance instance = PSGetInstanceId();
      const PPB_Audio *ppb_audio = PSInterfaceAudio();
      const PPB_AudioConfig *ppb_audiocfg = PSInterfaceAudioConfig();
      
      private = (SDL_PrivateAudioData *) SDL_calloc(1, (sizeof *private));
      if (private == NULL) {
          SDL_OutOfMemory();
          return 0;
      }
      
      private->mutex = SDL_CreateMutex();
      _this->spec.freq = 44100;
      _this->spec.format = AUDIO_S16LSB;
      _this->spec.channels = 2;
      _this->spec.samples = ppb_audiocfg->RecommendSampleFrameCount(
          instance, 
          PP_AUDIOSAMPLERATE_44100, 
          SAMPLE_FRAME_COUNT);
      
      /* Calculate the final parameters for this audio specification */
      SDL_CalculateAudioSpec(&_this->spec);
      
      private->audio = ppb_audio->Create(
          instance,
          ppb_audiocfg->CreateStereo16Bit(instance, PP_AUDIOSAMPLERATE_44100, _this->spec.samples),
          nacl_audio_callback, 
          _this);
      
      /* Start audio playback while we are still on the main thread. */
      ppb_audio->StartPlayback(private->audio);
      
      return 1;
  }
  
  static int
  NACLAUD_Init(SDL_AudioDriverImpl * impl)
  {
      if (PSGetInstanceId() == 0) {
          return 0;
      }
      
      /* Set the function pointers */
      impl->OpenDevice = NACLAUD_OpenDevice;
      impl->CloseDevice = NACLAUD_CloseDevice;
      impl->HasCaptureSupport = 0;
      impl->OnlyHasDefaultOutputDevice = 1;
      impl->OnlyHasDefaultInputDevice = 1;
      impl->ProvidesOwnCallbackThread = 1;
      /*
       *    impl->WaitDevice = NACLAUD_WaitDevice;
       *    impl->GetDeviceBuf = NACLAUD_GetDeviceBuf;
       *    impl->PlayDevice = NACLAUD_PlayDevice;
       *    impl->Deinitialize = NACLAUD_Deinitialize;
       */
      
      return 1;
  }
  
  AudioBootStrap NACLAUD_bootstrap = {
      NACLAUD_DRIVER_NAME, "SDL NaCl Audio Driver",
      NACLAUD_Init, 0
  };