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# StereoSound.cpp

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    00001 //------------------------------------------------------------------------------
    00002 // Lamp : Open source game middleware
    00003 // Copyright (C) 2004  Junpei Ohtani ( Email : junpee@users.sourceforge.jp )
    00004 //
    00005 // This library is free software; you can redistribute it and/or
    00006 // modify it under the terms of the GNU Lesser General Public
    00007 // License as published by the Free Software Foundation; either
    00008 // version 2.1 of the License, or (at your option) any later version.
    00009 //
    00010 // This library is distributed in the hope that it will be useful,
    00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00013 // Lesser General Public License for more details.
    00014 //
    00015 // You should have received a copy of the GNU Lesser General Public
    00016 // License along with this library; if not, write to the Free Software
    00017 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    00018 //------------------------------------------------------------------------------
    00019
    00020 /** @file
    00021  * ステレオサウンド実装
    00022  * @author Junpee
    00023  */
    00024
    00025 #include "LampBasic.h"
    00026 #include "Sound/Stereo/StereoSound.h"
    00027
    00028 namespace Lamp{
    00029
    00030 //------------------------------------------------------------------------------
    00031 // コンストラクタ
    00032 StereoSound::StereoSound(DirectSoundBuffer* soundBuffer) :
    00033     SoundBuffer(soundBuffer), pan_(0.f){
    00034     // 初期データの取得
    00035     long decibelPan;
    00036     if(DirectXFailed(soundBuffer->GetPan(&decibelPan))){
    00037         ErrorOut("StereoSound::StereoSound() パンの取得に失敗しました。");
    00038     }
    00039     int absDecibelPan = Math::abs(decibelPan);
    00040     pan_ = 1.f - decibelToVolume(-absDecibelPan);
    00041     if(decibelPan < 0.f){ pan_ = -pan_; }
    00042 }
    00043 //------------------------------------------------------------------------------
    00044 // デストラクタ
    00045 StereoSound::~StereoSound(){
    00046 }
    00047 //------------------------------------------------------------------------------
    00048 // ステレオサウンドデータのコピー
    00049 void StereoSound::copyStereoSoundData(StereoSound* destination){
    00050     copySoundBufferData(destination);
    00051 }
    00052 //------------------------------------------------------------------------------
    00053 // パンの設定
    00054 void StereoSound::setPan(float pan){
    00055     if(pan_ == pan){ return; }
    00056     Assert(pan >= -1.f);
    00057     Assert(pan <= 1.f);
    00058     float absPan = Math::abs(pan);
    00059     if(absPan <= 0.002f){// 0.002f以下はdbが0になる
    00060         if(DirectXFailed(getSoundBuffer()->SetPan(DSBPAN_CENTER))){
    00061             ErrorOut("StereoSound::setPan() パンの設定に失敗しました。");
    00062         }
    00063     }else{
    00064         // Panは絶対値が0から1に近づく程、音量が下がる
    00065         int db = volumeToDecibel(1.f - absPan);
    00066         if(db == 0){ db = DSBPAN_LEFT; }
    00067         Assert((db <= DSBPAN_CENTER) && (db >= DSBPAN_LEFT));
    00068         if(pan > 0.f){ db = -db; }
    00069         if(DirectXFailed(getSoundBuffer()->SetPan(db))){
    00070             ErrorOut("StereoSound::setPan() パンの設定に失敗しました。");
    00071         }
    00072     }
    00073     pan_ = pan;
    00074 }
    00075 //------------------------------------------------------------------------------
    00076 // リセット
    00077 void StereoSound::reset(Reset flags){
    00078     SoundBuffer::reset(flags);
    00079     if((flags & resetPan) != 0){ setPan(0.f); }
    00080 }
    00081 //------------------------------------------------------------------------------
    00082 // 文字列への変換
    00083 String StereoSound::toString() const{
    00084     String result, temp;
    00085     result = SoundBuffer::toString();
    00086     temp.format("Pan(%.2f) BufferSize(%7dbyte)\n",
    00087         getPan(), getBufferSize());
    00088     result += temp;
    00089     return result;
    00090 }
    00091 //------------------------------------------------------------------------------
    00092 } // End of namespace Lamp
    00093 //------------------------------------------------------------------------------