open_toontown_panda3d/panda/src/audio/audioManager.cxx

/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file audioManager.cxx
 * @author skyler
 * @date 2001-06-06
 * Prior system by: cary
 */

#include "config_audio.h"
#include "audioManager.h"
#include "atomicAdjust.h"
#include "nullAudioManager.h"
#include "windowsRegistry.h"
#include "virtualFileSystem.h"
#include "config_putil.h"
#include "load_dso.h"

#ifdef _WIN32
#include <windows.h>  // For GetSystemDirectory()
#endif

using std::string;


TypeHandle AudioManager::_type_handle;


namespace {
  AudioManager *create_NullAudioManager() {
    audio_debug("create_NullAudioManager()");
    return new NullAudioManager();
  }
}

Create_AudioManager_proc *AudioManager::_create_AudioManager = nullptr;

void AudioManager::
register_AudioManager_creator(Create_AudioManager_proc* proc) {
  nassertv(_create_AudioManager == nullptr || _create_AudioManager == proc);
  _create_AudioManager = proc;
}

// Factory method for getting a platform specific AudioManager:
PT(AudioManager) AudioManager::create_AudioManager() {
  audio_debug("create_AudioManager()\n  audio_library_name=\""<<audio_library_name<<"\"");

  if (_create_AudioManager != nullptr) {
    // Someone was already so good as to register an audio manager creation function,
    // perhaps by statically linking the requested library.  Let's use that, then.
    PT(AudioManager) am = (*_create_AudioManager)();
    if (!am->is_exact_type(NullAudioManager::get_class_type()) && !am->is_valid()) {
      audio_error("  " << am->get_type() << " is not valid, will use NullAudioManager");
      am = create_NullAudioManager();
    }
    return am;
  }

  static bool lib_load = false;
  if (!lib_load) {
    lib_load = true;
    if (!audio_library_name.empty() && audio_library_name != "null") {
      Filename dl_name = Filename::dso_filename(
          "lib" + string(audio_library_name) + ".so");
      dl_name.to_os_specific();
      audio_debug("  dl_name=\""<<dl_name<<"\"");
      void *handle = load_dso(get_plugin_path().get_value(), dl_name);
      if (handle == nullptr) {
        audio_error("  load_dso(" << dl_name << ") failed, will use NullAudioManager");
        audio_error("    "<<load_dso_error());
        nassertr(_create_AudioManager == nullptr, nullptr);
      } else {
        // Get the special function from the dso, which should return the
        // AudioManager factory function.
        string lib_name = audio_library_name;
        if (lib_name.substr(0, 2) == "p3") {
          lib_name = lib_name.substr(2);
        }
        string symbol_name = "get_audio_manager_func_" + lib_name;
        void *dso_symbol = get_dso_symbol(handle, symbol_name);
        if (audio_cat.is_debug()) {
          audio_cat.debug()
            << "symbol of " << symbol_name << " = " << dso_symbol << "\n";
        }

        if (dso_symbol == nullptr) {
          // Couldn't find the module function.
          unload_dso(handle);
          handle = nullptr;
          audio_error("  Audio library did not provide get_audio_manager_func, will use NullAudioManager");
        } else {
          typedef Create_AudioManager_proc *FuncType();
          Create_AudioManager_proc *factory_func = (*(FuncType *)dso_symbol)();

          // Note that the audio manager module may register itself upon load.
          if (_create_AudioManager == nullptr) {
            AudioManager::register_AudioManager_creator(factory_func);
          }
        }
      }
    }
  }

  if (_create_AudioManager == nullptr) {
    _create_AudioManager = create_NullAudioManager;
  }

  PT(AudioManager) am = (*_create_AudioManager)();
  if (!am->is_exact_type(NullAudioManager::get_class_type()) && !am->is_valid()) {
    audio_error("  " << am->get_type() << " is not valid, will use NullAudioManager");
    am = create_NullAudioManager();
  }
  return am;
}

/**
 *
 */
AudioManager::
~AudioManager() {
  if (_null_sound != nullptr) {
    unref_delete((AudioSound *)_null_sound);
  }
}

/**
 *
 */
AudioManager::
AudioManager() {
  _null_sound = nullptr;
}

/**
 * Call this at exit time to shut down the audio system.  This will invalidate
 * all currently-active AudioManagers and AudioSounds in the system.  If you
 * change your mind and want to play sounds again, you will have to recreate
 * all of these objects.
 */
void AudioManager::
shutdown() {
}

/**
 * Returns a special NullAudioSound object that has all the interface of a
 * normal sound object, but plays no sound.  This same object may also be
 * returned by get_sound() if it fails.
 */
PT(AudioSound) AudioManager::
get_null_sound() {
  if (_null_sound == nullptr) {
    AudioSound *new_sound = new NullAudioSound;
    new_sound->ref();
    void *result = AtomicAdjust::compare_and_exchange_ptr(_null_sound, nullptr, (void *)new_sound);
    if (result != nullptr) {
      // Someone else must have assigned the AudioSound first.  OK.
      nassertr(_null_sound != new_sound, nullptr);
      unref_delete(new_sound);
    }
    nassertr(_null_sound != nullptr, nullptr);
  }

  return (AudioSound *)_null_sound;
}

/**
 *
 */
int AudioManager::
get_speaker_setup() {
  // intentionally blank
  return 0;
}

/**
 *
 */
void AudioManager::
set_speaker_setup(SpeakerModeCategory cat) {
  // intentionally blank
}

/**
 * Configures the global DSP filter chain.
 *
 * There is no guarantee that any given configuration will be supported by the
 * implementation.  The only way to find out what's supported is to call
 * configure_filters.  If it returns true, the configuration is supported.
 */
bool AudioManager::
configure_filters(FilterProperties *config) {
  const FilterProperties::ConfigVector &conf = config->get_config();
  if (conf.empty()) {
    return true;
  } else {
    return false;
  }
}

/**
 * Must be called every frame.  Failure to call this every frame could cause
 * problems for some audio managers.
 */
void AudioManager::
update() {
  // Intentionally blank.
}

/**
 *
 */
void AudioManager::audio_3d_set_listener_attributes(PN_stdfloat px, PN_stdfloat py, PN_stdfloat pz, PN_stdfloat vx, PN_stdfloat vy, PN_stdfloat vz, PN_stdfloat fx, PN_stdfloat fy, PN_stdfloat fz, PN_stdfloat ux, PN_stdfloat uy, PN_stdfloat uz) {
    // intentionally blank.
}

/**
 *
 */
void AudioManager::audio_3d_get_listener_attributes(PN_stdfloat *px, PN_stdfloat *py, PN_stdfloat *pz, PN_stdfloat *vx, PN_stdfloat *vy, PN_stdfloat *vz, PN_stdfloat *fx, PN_stdfloat *fy, PN_stdfloat *fz, PN_stdfloat *ux, PN_stdfloat *uy, PN_stdfloat *uz) {
    // intentionally blank.
}

/**
 *
 */
void AudioManager::audio_3d_set_distance_factor(PN_stdfloat factor) {
    // intentionally blank.
}

/**
 *
 */
PN_stdfloat AudioManager::audio_3d_get_distance_factor() const {
    // intentionally blank.
    return 0.0f;
}

/**
 *
 */
void AudioManager::audio_3d_set_doppler_factor(PN_stdfloat factor) {
    // intentionally blank.
}

/**
 *
 */
PN_stdfloat AudioManager::audio_3d_get_doppler_factor() const {
    // intentionally blank.
    return 0.0f;
}

/**
 *
 */
void AudioManager::audio_3d_set_drop_off_factor(PN_stdfloat factor) {
    // intentionally blank.
}

/**
 *
 */
PN_stdfloat AudioManager::audio_3d_get_drop_off_factor() const {
    // intentionally blank.
    return 0.0f;
}

/**
 * Returns the full pathname to the DLS file, as specified by the Config.prc
 * file, or the default for the current OS if appropriate.  Returns empty
 * string if the DLS file is unavailable.
 */
Filename AudioManager::
get_dls_pathname() {
  Filename dls_filename = audio_dls_file;
  if (!dls_filename.empty()) {
    VirtualFileSystem *vfs = VirtualFileSystem::get_global_ptr();
    vfs->resolve_filename(dls_filename, get_model_path());

    return dls_filename;
  }

#ifdef _WIN32
  Filename pathname;

  // Get the registry key from DirectMusic
  string os_filename = WindowsRegistry::get_string_value("SOFTWARE\\Microsoft\\DirectMusic", "GMFilePath", "");

  if (!os_filename.empty()) {
    pathname = Filename::from_os_specific(os_filename);
  } else {
    char sysdir[MAX_PATH+1];
    GetSystemDirectory(sysdir,MAX_PATH+1);
    pathname = Filename(Filename::from_os_specific(sysdir), Filename("drivers/gm.dls"));
  }
  pathname.make_true_case();
  return pathname;

#elif defined(IS_OSX)
  // This appears to be the standard place for this file on OSX 10.4.
  return Filename("/System/Library/Components/CoreAudio.component/Contents/Resources/gs_instruments.dls");

#else
  return Filename();
#endif
}

/**
 *
 */
void AudioManager::
output(std::ostream &out) const {
  out << get_type();
}

/**
 *
 */
void AudioManager::
write(std::ostream &out) const {
  out << (*this) << "\n";
}