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    Running Pulseaudio on Qt

    General and Desktop
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      sruthihsr last edited by

      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.

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