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mixer.cpp

Go to the documentation of this file.

/*
        ClanSound, sound mixing library written for ClanLib.
        Copyright (c)1998 Magnus Norddahl / ClanSoft.
*/

#ifdef WIN32
#pragma warning (disable:4786)
#endif

#ifdef USE_CLANSOUND

#include <Sound/Sound/ClanSound/mixer.h>
#include <Sound/Sound/ClanSound/cardplayback_clan.h>

#ifdef USE_I386_ASSEMBLER
#if defined(__BORLANDC__) && !defined(USE_TASM)
  #undef
#else
  #define MIXER_CLIP_ASM
#endif
#endif

#ifdef MIXER_CLIP_ASM
extern "C"
{
        void mixer_clip_asm(
                int *mix_buffer2,
                short *mix_buffer,
                int size);
}
#endif

CL_CSMixer::CL_CSMixer()
{
        mix_buffer_size = output.get_frag_size()*2;
        mix_buffer = new short[mix_buffer_size];
        mix_buffer2 = new int[mix_buffer_size];
}

CL_CSMixer::~CL_CSMixer()
{
        delete[] mix_buffer;
        delete[] mix_buffer2;
}

void CL_CSMixer::add(CL_CardPlayback_ClanSound *playback)
{
        playbacks.push_back(playback);
}

void CL_CSMixer::remove(CL_CardPlayback_ClanSound *playback)
{
        playbacks.remove(playback);
}

void CL_CSMixer::wait()
{
        output.wait();
}

void CL_CSMixer::mix(CL_Mutex *mutex)
{
        
        memset(mix_buffer2, 0, sizeof(int)*mix_buffer_size);

//      int num_sessions = playbacks.size();
//      for (int i=0; i<num_sessions; i++)

        mutex->enter();
        for (
                std::list<CL_CardPlayback_ClanSound*>::iterator it = playbacks.begin();
                it != playbacks.end();
                it++)
        {
                if ((*it)->is_playing() == false) continue;

                (*it)->mix_to(mix_buffer2, mix_buffer_size >> 1);
        }
        mutex->leave();

#ifdef MIXER_CLIP_ASM
        mixer_clip_asm(mix_buffer2, mix_buffer, mix_buffer_size);
#else
        for (int k=0; k<mix_buffer_size; k++)
        {
                mix_buffer2[k] >>= 1;
        
                if      (mix_buffer2[k] > 32200)  mix_buffer[k] = 32200;
                else if (mix_buffer2[k] < -32200) mix_buffer[k] = -32200;
                else                              mix_buffer[k] = mix_buffer2[k];
        }
#endif

        output.write_fragment(mix_buffer);
}

#endif

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