Running Pulseaudio on Qt

sruthihsr · wrote on 3 Aug 2011, 11:55

Hi I am running pulse audio playback example mentioned in the wesite on qt.
I am getting a blank nise intead of the audio playing.
I tried with formats mp3 and ogg.both are resulting the same.
I am pasting the code below
@#include <QtGui/QApplication>
#include "qmlapplicationviewer.h"
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>

#include <pulse/simple.h>
#include <pulse/error.h>
#include <pulse/gccmacro.h>
#include <pulse/pulseaudio.h>
#include <pulse/sample.h>
#include <fstream>
using namespace std;

#define BUFSIZE 1024

int main(int argc, char *argv[])
{

QApplication app(argc, argv);

QmlApplicationViewer viewer;
viewer.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
viewer.setMainQmlFile&#40;QLatin1String("qml/paudio/main.qml"&#41;);
viewer.showExpanded();
//ofstream myfile;
 // myfile.open ("abc.mp3");



static  pa_sample_spec ss;


    ss.format = PA_SAMPLE_S16LE;
   ss.rate = 44100;
    ss.channels = 2;





   pa_simple *s = NULL;
   int ret = 1;
   int error;

   /* replace STDIN with the specified file if needed */
   if (argc >= 1) {
       int fd;
       argv[1]="abc.ogg";

       if ((fd = open(argv[1], O_RDONLY)) < 0) {
           fprintf(stderr, __FILE__": open() failed: %s\n", strerror(errno));
           goto finish;
       }

       if (dup2(fd, STDIN_FILENO) < 0) {
           fprintf(stderr, __FILE__": dup2() failed: %s\n", strerror(errno));
           goto finish;
       }

     //  close(fd);
   }

   /* Create a new playback stream */
   if (!(s = pa_simple_new(NULL, argv[0], PA_STREAM_PLAYBACK, NULL, "sru123", &ss, NULL, NULL, &error))) {
       fprintf(stderr, __FILE__": pa_simple_new() failed: %s\n", pa_strerror(error));
       goto finish;
   }

   for (;;) {
       uint8_t buf[BUFSIZE];
       ssize_t r;

#if 0
pa_usec_t latency;

       if ((latency = pa_simple_get_latency(s, &error)) == (pa_usec_t) -1) {
           fprintf(stderr, __FILE__": pa_simple_get_latency() failed: %s\n", pa_strerror(error));
           goto finish;
       }

       fprintf(stderr, "%0.0f usec    \r", (float)latency);

#endif

       /* Read some data ... */
       if ((r = read(STDIN_FILENO, buf, sizeof(buf))) <= 0) {
           if (r == 0) /* EOF */
               break;

           fprintf(stderr, __FILE__": read() failed: %s\n", strerror(errno));
           goto finish;
       }

       /* ... and play it */
       if (pa_simple_write(s, buf, (size_t) r, &error) < 0) {
           fprintf(stderr, __FILE__": pa_simple_write() failed: %s\n", pa_strerror(error));
           goto finish;
       }
   }

   /* Make sure that every single sample was played */
   if (pa_simple_drain(s, &error) < 0) {
       fprintf(stderr, __FILE__": pa_simple_drain() failed: %s\n", pa_strerror(error));
       goto finish;
   }

   ret = 0;

finish:

   if (s)
       pa_simple_free(s);

   //return ret;

return app.exec();
}
@
I am new to Linux and pulse audio. so please explain in detail.