C++ Mix_VolumeChunk函数代码示例

void SoundMix::PlaySoundWithVolume( int sound, int volume )
{

	if (Config::GetSound()!=1)
	{
		return;
	}

	wave = Load( sound );

	if ( !wave )
	{
		return;
	}

	if ( wave )
	{
		Mix_VolumeChunk( wave, volume );
		if ( Mix_PlayChannel( -1, wave, 0 ) == -1 )
		{
			printf( "Mix_PlayChannel: %s\n", Mix_GetError() );
			// may be critical error, or maybe just no channels were free.
			// you could allocated another channel in that case...
			Mix_FreeChunk( wave );
			wave = NULL;
		}
	}
}

/*! 
  Change volume for a sound associated with the specified sound context
  \pre     sound_context != NULL
  \arg \c  sound_context the sound context
       \i  volume is a value 0-128 
  \return  true if volume was set; false otherwise
  \author  ehall
  \date    Created:  2000-09-13
  \date    Modified: 2000-09-13
*/
bool_t set_sound_volume( char *sound_context, int volume )
{
    int i;
    sound_context_data_t *data;

    if ( ! get_hash_entry( sound_contexts_, sound_context, 
			   (hash_entry_t*) &data ) ) {
	return False;
    }
    data->volume = volume;

    i = (int) (((double)data->num_sounds)*rand()/(RAND_MAX+1.0));
    for ( i=0; i<data->num_sounds; i++ ) {
	if ( data->chunks[i] == NULL ) {
	    bool_t found;
	    found = get_sound_data( data->sound_names[i], &(data->chunks[i]) );
	    check_assertion( found, "sound name not found" );
	    check_assertion( data->chunks[i]!=NULL, "sound chunk not set" );
	}

	Mix_VolumeChunk( data->chunks[i], data->volume );

    }
    return True;
}

extern void PlaySound(char * file, unsigned char volume, int channel, int times)
{
	Mix_Chunk* soundeff = SoundEffects.find(file)->second;
	Mix_PlayChannel(channel, soundeff, times - 1);

	Mix_VolumeChunk(soundeff, volume);
}

void THSoundEffects::setSoundArchive(THSoundArchive *pArchive)
{
    for(size_t i = 0; i < m_iSoundCount; ++i)
    {
        Mix_FreeChunk(m_ppSounds[i]);
    }
    delete[] m_ppSounds;
    m_ppSounds = NULL;
    m_iSoundCount = 0;

    if(pArchive == NULL)
        return;

    m_ppSounds = new Mix_Chunk*[pArchive->getSoundCount()];
    for(; m_iSoundCount < pArchive->getSoundCount(); ++m_iSoundCount)
    {
        m_ppSounds[m_iSoundCount] = NULL;
        SDL_RWops *pRwop = pArchive->loadSound(m_iSoundCount);
        if(pRwop)
        {
            m_ppSounds[m_iSoundCount] = Mix_LoadWAV_RW(pRwop, 1);
            if(m_ppSounds[m_iSoundCount])
                Mix_VolumeChunk(m_ppSounds[m_iSoundCount], MIX_MAX_VOLUME);
        }
    }
}

static void *
play_sound(const char *filename, int loop, double volume)
{
    struct player_sound *sound;
    unsigned long hash;
    int sdl_volume = (int)(volume * MIX_MAX_VOLUME);

    hash = crc32(0, (void *)filename, strlen(filename));
    hash %= sizeof(sounds) / sizeof(sounds[0]);
    for (sound = sounds[hash]; sound != NULL; sound = sound->next) {
        if (strcmp(filename, sound->filename) == 0)
            break;
    }

    if (sound == NULL) {
        fprintf(stderr, "play_sound: %s not loaded?\n", filename);
        return NULL;
    }

    if (sound->chunk != NULL) {
        Mix_VolumeChunk(sound->chunk, sdl_volume);
        sound->chunk_channel = Mix_PlayChannel(-1, sound->chunk, loop ? -1 : 0);
    } else if (sound->music != NULL) {
        Mix_HaltMusic();
        active_music = sound->music;
        Mix_VolumeMusic(sdl_volume);
        Mix_PlayMusic(sound->music, loop ? -1 : 1);
    }
    return sound;
}

void sound_player::populate_from(sound_archive *pArchive)
{
    for(size_t i = 0; i < sound_count; ++i)
    {
        Mix_FreeChunk(sounds[i]);
    }
    delete[] sounds;
    sounds = nullptr;
    sound_count = 0;

    if(pArchive == nullptr)
        return;

    sounds = new Mix_Chunk*[pArchive->get_number_of_sounds()];
    for(; sound_count < pArchive->get_number_of_sounds(); ++sound_count)
    {
        sounds[sound_count] = nullptr;
        SDL_RWops *pRwop = pArchive->load_sound(sound_count);
        if(pRwop)
        {
            sounds[sound_count] = Mix_LoadWAV_RW(pRwop, 1);
            if(sounds[sound_count])
                Mix_VolumeChunk(sounds[sound_count], MIX_MAX_VOLUME);
        }
    }
}

int sdlplayer_fx(char *filename, int volume)
{
  Mix_Chunk *sample;

  g_warning("sdlplayer %s\n", filename);

  sample=Mix_LoadWAV_RW(SDL_RWFromFile(filename, "rb"), 1);
  if(!sample) {
    return(cleanExit("Mix_LoadWAV_RW"));
    // handle error
  }

  Mix_VolumeChunk(sample, MIX_MAX_VOLUME);

  if((_channel_fx = Mix_PlayChannel(-1, sample, 0))==-1) {
    return(cleanExit("Mix_LoadChannel(0x%p,1)", _channel_fx));
  }

  while( Mix_Playing( _channel_fx ) )
    {
      SDL_Delay(50);
    }

  // free the sample
  // Mix_Chunk *sample;
  Mix_FreeChunk(sample);
  _channel_fx = -1;

  g_warning("sdlplayer complete playing of %s\n", filename);

  return(0);
}

void noegnud_sound_play(const char *filename,float volume) {
    noegnud_tcollection *soundcollection;
    noegnud_sound_tsound *sound;
    int internal_volume;

    if (!noegnud_sound_initialised) return;

    soundcollection=noegnud_sound_load(filename);
    if (soundcollection) {
	if (volume<0) volume=0;
	if (volume>1) volume=1;

	sound=(noegnud_sound_tsound *)soundcollection->data;
	internal_volume=volume*MIX_MAX_VOLUME;
	if (sound->chunk) {
#ifdef NOEGNUDDEBUG
	    printf("[SOUND] noegnud_sound_play: playing chunk \"%s\" (%2.3f)\n",filename,volume);
#endif
	    Mix_VolumeChunk(sound->chunk,internal_volume);
	    Mix_PlayChannel(-1,sound->chunk,0);
	} else if (sound->music) {
#ifdef NOEGNUDDEBUG
	    printf("[SOUND] noegnud_sound_play: playing music \"%s\" (%2.3f)\n",filename,volume);
#endif
	    Mix_VolumeMusic(internal_volume);
	    Mix_PlayMusic(sound->music,0);
	} else {
	    printf("[SOUND] WARNING: noegnud_sound_play: unknown file format/could not load \"%s\"\n",filename);
	}
    } else {
	printf("[SOUND] noegnud_sound_play: could not load/play \"%s\"\n",filename);
    }
}

void PGE_Sounds::SND_PlaySnd(QString sndFile)
{
    if(current!=sndFile)
    {
        #ifdef USE_QMEDIAPLAYER
        if(mp3Play) { mp3Play->stop(); delete mp3Play; mp3Play=NULL; }
        #elif USE_SDL_MIXER
        if(sound) { Mix_FreeChunk(sound); sound=NULL; }
        sound = Mix_LoadWAV(sndFile.toUtf8().data() );
        if(!sound)
            qDebug() << QString("Mix_LoadWAV: %1").arg(SDL_GetError());
        else
            Mix_VolumeChunk(sound, MIX_MAX_VOLUME);
        #endif
        current = sndFile;
    }

    #ifdef USE_QMEDIAPLAYER
    qDebug() << QString("Play Sound (QMediaPlayer)");
    if(!mp3Play)
    {
        qDebug() << QString("QMediaPlayer is null");
    }
    else
        mp3Play->play();
    #elif USE_SDL_MIXER

    LogDebug(QString("Play Sound (SDL2_mixer)"));
    if(Mix_PlayChannel( -1, sound, 0 )==-1)
    {
        qDebug() << QString("Mix_PlayChannel: %1").arg(SDL_GetError());
    }

#endif
}

void TempFigure::setFigure(int x, int y, Surface& image, SDL_Surface* screen,
      int levelWidth, int levelHeight) {
   Figure::setFigure(x, y, image, screen, GRAVITY_DISABLED, levelWidth,
         levelHeight, false, 5, 1, 1, 1);
   scratch.setChunk("sounds/scratch.wav");
   Mix_VolumeChunk(scratch.getMix_Chunk(), 128);
   marker = ACTIVE;
}

//------------------------------
// Sound functions
//------------------------------
void sound_playfx(Mix_Chunk* snd)
{
    if(sound_enabled == true)
    {
        Mix_VolumeChunk(snd, sound_volfx*10);
        Mix_PlayChannel( -1, snd, 0 );
    }
}

	void SoundSystem::SetAllSoundEffectVolumes(int volume)
	{
		if (volume > 128) { volume = 128; } else if (volume < 0) { volume = 0; }

		for (auto& it : m_SoundEffect) {
			Mix_VolumeChunk(it.second.get(), volume);
		}
	}

 void platform_support::play_sound(unsigned idx, unsigned vol)
 {
    if (idx >= max_images || !m_specific->m_sounds[idx])
    {
       return;
    }
    Mix_VolumeChunk(m_specific->m_sounds[idx], vol);
    Mix_PlayChannel( -1, m_specific->m_sounds[idx], 0 );
 }

void set_strings_volume(void)
{
	int i;
	for(i=0;i<128;i++)
	{
		Mix_VolumeChunk(strings_note_chunk[i],(int)(MIX_MAX_VOLUME*strings_volume));
	}
	
}

void CSoundEffect::SetVolume(const u32 a_Volume)
{
    if (a_Volume >= 0 && a_Volume <= MIX_MAX_VOLUME)
    {
        m_Volume = a_Volume;
        if (m_Chunk != nullptr)
            Mix_VolumeChunk(m_Chunk, m_Volume);
    }
}