Running Pulseaudio on Qt
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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(QLatin1String("qml/paudio/main.qml")); 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.