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DSPaudioIO Class Reference

audio output to linux pseudo-file /dev/dsp <short description=""> More...

#include <DSPaudioIO.hpp>

Inheritance diagram for DSPaudioIO:

AudioIO IO VThread List of all members.

Public Member Functions

 DSPaudioIO (AudioESInfo *es, ESSynchronizer *ess=NULL, bool enableHeadphones=false)
int initialize ()
Frame * getFrame ()
 returns a frame if one complete frame is available, otherwise null is returned.
int writeFrame (Frame *frm, ESInfo *out_es=NULL)
 returns the number of packets sent.
bool open ()
 opens the IO connection.
bool close (bool immediate=false)
 closes the IO class.

Detailed Description

audio output to linux pseudo-file /dev/dsp <short description="">

Author:
Mithlesh Kumar
Version:
Id
DSPaudioIO.hpp,v 1.10 2006/01/20 15:37:18 mkropfbe Exp

Definition at line 78 of file DSPaudioIO.hpp.

Member Function Documentation

bool DSPaudioIO::close (  bool  immediate = false  )  [virtual]
 

closes the IO class.

Parameters:
immediate specifies, if (optional) buffered data should be read/sent to the client (==false), or immediately dumped (==true)

Implements IO.

Definition at line 167 of file DSPaudioIO.cpp.

References AudioIO::destroy(), and IO::setState().

00167                                      {
00168         
00169         ::close(fd);
00170         
00171         destroy();
00172         setState(CLOSED);
00173         //::exit(0);
00174         return true;
00175 }

Frame * DSPaudioIO::getFrame (   )  [virtual]
 

returns a frame if one complete frame is available, otherwise null is returned.

This function is typically blocking. Don't use a NULL return value to conclude STREAMEOF, always check with getState()!

Implements IO.

Definition at line 117 of file DSPaudioIO.cpp.

00117                              {
00118         return NULL;
00119 }

bool DSPaudioIO::open (   )  [virtual]
 

opens the IO connection.

State is set to OPENING. When the connection is ready for use, State is OPEN

Implements IO.

Definition at line 156 of file DSPaudioIO.cpp.

References ESSynchronizer::setPaused(), and IO::setState().

00156                       {
00157         if (getESSync()) {
00158                 dprintf_full("DSPaudioIO::open()PAUSING ESSynchronizer\n");
00159                 getESSync()->setPaused(true);
00160                 requestUnpauseESS = true; // no locking, as the SDL thread is not running yet
00161         }
00162         setState(OPEN);
00163         return true;
00164 }

int DSPaudioIO::writeFrame (  Frame *  frm,
ESInfo *  out_es = NULL
)  [virtual]
 

returns the number of packets sent.

Returns 0 on error

Implements IO.

Definition at line 122 of file DSPaudioIO.cpp.

References GlobalTimer::adjustToTS(), Frame::getAU(), ESSynchronizer::getGlobalTimer(), and ESSynchronizer::setPaused().

00122                                                       {
00123         dprintf_full("DSPaudioIO::writeFrame %i bytes, using %s audio device \n",frm->getAU()->size, AUDIO_DEVICE);
00124   if (firstFrame) {
00125     firstFrame = false;
00126     if(initialize() < 0) {
00127       dprintf_err("DSPaudioIO::writeFrame Error in initializing\n");
00128       return 0;
00129     }
00130   }
00131   
00132   audio_chunk = frm->getAU()->payload;
00133   audio_len = frm->getAU()->size;
00134           assert(audio_chunk != NULL);
00135   if(getState() != MUTED) {
00136                 if (audio_buffer(fd, audio_chunk, audio_len ) < 0) {
00137                   dprintf_err("DSPaudioIO:: Error in Playing audio chunk\n");
00138                 }
00139   }
00140         if (getESSync())
00141                 getESSync()->getGlobalTimer()->adjustToTS(frm->getAU()->cts, es->getMediaTimeScale());
00142         if (requestUnpauseESS && getESSync()) {
00143                 dprintf_full("DSPaudioIO: unpausing ESSychronizer\n");
00144                 requestUnpauseESS = false;
00145                 getESSync()->setPaused(false);
00146         }
00147 
00148 
00149         //#ifdef _POSIX_PRIORITY_SCHEDULING
00150         //  sched_yield(); //this is necessary to give parallel getFrames a chance
00151         //#endif
00152   return 1; //one frame written
00153 }

The documentation for this class was generated from the following files: