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Thursday the 24th of May 2012 @ 03:04am

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LibN2L N2L Home Older News Downloads Documentation (n2l5) Class Hierarchy Compound List File List n2l:: Members Functions Whole n2l:: Ref Documentation (libN2L-4) Class Hierarchy Compound List File List n2l:: Members Functions Whole n2l:: Ref Bugtracker Project Page Report a Bug Bug List Related Things Life 2130 Devel Game Journal

LibN2L-4 Library Code Reference Classes Compounds Files Members Method Index Full Reference cAudioChunk.cpp Go to the documentation of this file. /************************************************************************ Nova-2 Library (libN2L, or simply n2l) Game development C++ Library Copyright (C) 2002 Aaron Cameron This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA A copy of the GNU Lesser General Public License has been provided with this library in the file 'COPYING'. Contact information for the author of this library has been provided with this library in the file 'AUTHOR'. ************************************************************************/ #include "audio/cAudioChunk.h" #include "n2l/vfs.h" #include "audio/cAudioMixer.h" #include "SDL_mixer.h" namespace n2l { /**************************************************************************/ cAudioChunk::cAudioChunk() : mChunk(0) { } /**************************************************************************/ cAudioChunk::cAudioChunk( const cVfsNodeInterface &iFile ) : mChunk(0) { load(iFile); } /**************************************************************************/ cAudioChunk::~cAudioChunk() { } /**************************************************************************/ void cAudioChunk::load( const cVfsNodeInterface &iFile ) { // Release any existing chunk imp. free(); if (!cAudioMixer::inited()) return; // Is it ok? if (!iFile.likeFile()) throw cBadDataUseException( "cAudioChunk::load", tString("Node is not like a file: ") + iFile.name() ); // Let's just try to load it Mix_Chunk * temp( Mix_LoadWAV_RW( iFile.getRWops(), 1 ) ); if (0==temp) throw cDriverLayerException("cAudioChunk::load", "Failed to load music from memory", "SDL_mixer", Mix_GetError() ); mChunk = new cAudioChunkImp( temp ); // Calculate the length of the sample in seconds const tFloat Samples = mChunk->bufferSize()/cAudioMixer::sampleSize(); const tFloat Seconds = Samples/tFloat(cAudioMixer::frequency()); mLength = tUint(Seconds*1000.0f+0.5f); if (cAudioMixer::soundChannels() == cAudioMixer::Channels_Stereo) mLength /= 2; } /**************************************************************************/ void cAudioChunk::free() { mChunk = 0; } /**************************************************************************/ const tUint cAudioChunk::length() const { if (!mChunk) { if (cAudioMixer::inited()) throw cBadDataUseException( "cAudioChunk::size", "Tried to get the length of an empty audio chunk." ); else return 0; } return mLength; } /**************************************************************************/ const tUint cAudioChunk::size() const { if (!mChunk) { if (cAudioMixer::inited()) throw cBadDataUseException( "cAudioChunk::size", "Tried to get the size of an empty audio chunk." ); else return 0; } return mChunk->bufferSize(); } /**************************************************************************/ const tAudioChannel cAudioChunk::play( const tBool iLoop ) const { if (!mChunk) { if (cAudioMixer::inited()) throw cBadDataUseException( "cAudioChunk::play", "Tried to play an empty audio chunk" ); else return 0; } const tAudioChannel Channel = Mix_PlayChannel(-1,mChunk->chunk(), (iLoop?-1:0) ); Mix_UnregisterAllEffects( Channel ); return Channel; } /**************************************************************************/ const tAudioChannel cAudioChunk::play( const tAudioVolume iLeft, const tAudioVolume iRight, const tAudioChannel iChannel ) const { if (!mChunk) { if (cAudioMixer::inited()) throw cBadDataUseException( "cAudioChunk::play", "Tried to play an empty audio chunk" ); else return 0; } const tAudioChannel Channel( Mix_PlayChannel(iChannel,mChunk->chunk(),0) ); Mix_UnregisterAllEffects( Channel ); Mix_SetPanning( Channel, iLeft,iRight ); return Channel; } /**************************************************************************/ const tAudioChannel cAudioChunk::play( const tFloat &iLRBias, const tFloat &iVol, const tAudioChannel iChannel ) const { if (!mChunk) { if (cAudioMixer::inited()) throw cBadDataUseException( "cAudioChunk::play", "Tried to play an empty audio chunk" ); else return 0; } const tFloat CBias = n2lMax( -1.0f, n2lMin(1.0f,iLRBias) ); const tFloat CVol = n2lMax( .0f, n2lMin(1.0f,iVol) ); const tFloat LVol = -CBias*127.0f + 127.0f; const tFloat RVol = CBias*127.0f + 127.0f; const tAudioChannel Channel( Mix_PlayChannel(iChannel,mChunk->chunk(),0) ); Mix_UnregisterAllEffects( Channel ); Mix_SetPanning( Channel, tAudioVolume(CVol*LVol), tAudioVolume(CVol*RVol) ); return Channel; } /**************************************************************************/ const tAudioChannel cAudioChunk::playAtPos( const tFloat &iDeg, const tFloat &iDist, const tAudioChannel iChannel ) const { if (!mChunk) { if (cAudioMixer::inited()) throw cBadDataUseException( "cAudioChunk::play", "Tried to play an empty audio chunk" ); else return 0; } const tAudioChannel Channel( Mix_PlayChannel(iChannel,mChunk->chunk(),0) ); // Clear existing effects Mix_UnregisterAllEffects( Channel ); // Position the audio Mix_SetPosition( Channel, tUint16(iDeg)%360, tUint8(n2lMin(255.0f,(255.0f*fabsf(iDist)))) ); return Channel; } /**************************************************************************/ } // namespace

©2012 Aaron Cameron