PlatformAudioOut.cpp File Reference

#include "PlatformAudioOut.h"
#include "../../devices/PAudioOut.h"
#include "../../utility/PEBLPath.h"
#include "../../utility/PError.h"
#include "../../libs/PEBLEnvironment.h"
#include "../../base/Evaluator.h"
#include "SDL.h"
#include "SDL_audio.h"
#include <cmath>
#include <fstream>
#include <memory.h>
#include <cerrno>
#include <cstring>

Go to the source code of this file.

Functions
void	PlayCallBack (void *dummy, Uint8 *stream, int len)

Variables
AudioInfo *	gWaveStream =NULL

Function Documentation

PlayCallBack()

void PlayCallBack	(	void *	dummy,
		Uint8 *	stream,
		int	len
	)

Definition at line 1057 of file sdl/PlatformAudioOut.cpp.

{
 
    SDL_memset(stream, 0, len);
 
    Uint8 * waveptr;
    int waveleft;
 
    //Cast udata to a proper form--this is dangerous and nasty.
    AudioInfo * wave = gWaveStream;//(AudioInfo*)(udata);
 
 
    //Put pointer at the proper place in the buffer.
    waveptr = wave->audio + wave->audiopos;
    waveleft = wave->audiolen - wave->audiopos;
 
    //   cerr << "waveleft: " <<  waveleft << "  len:" << len << endl;
    if(waveleft >= len)
        {
 
            SDL_MixAudio(stream, waveptr, len, SDL_MIX_MAXVOLUME);
            //This may appear in future formats.
            //SDL_MixAudioFormat(stream,waveptr,wave->spec,len,SDL_MIX_MAXVOLUME);
            wave->audiopos += len;
 
        }
    else
        {
            //This plays the of the file and stops playing.
            SDL_MixAudio(stream, waveptr, waveleft, SDL_MIX_MAXVOLUME);
            //SDL_MixAudioFormat(stream,waveptr,wave->spec,waveleft,SDL_MIX_MAXVOLUME);
 
            wave->audiopos += waveleft;
            SDL_PauseAudio(1);
            wave->audiopos=0;  //Reset it back to the beginning.
 
        }
 
}

References AudioInfo::audio, AudioInfo::audiolen, AudioInfo::audiopos, and gWaveStream.

Variable Documentation

gWaveStream

AudioInfo* gWaveStream =NULL

extern

Referenced by PlatformAudioOut::CreateSineWave(), PlatformAudioOut::LoadSoundFromData(), and PlayCallBack().