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Copyright (C) 2011  Fabian Kurz, DJ1YFK
$Id: pulseaudio.c 203 2011-03-21 22:55:21Z dj1yfk $

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later

This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.  See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
Street, Fifth Floor, Boston, MA  02110-1301, USA.

PulseAudio specific functions and includes.


#include <ncurses.h>
#include <stdlib.h>
#include <fcntl.h>
#include <pulse/simple.h>
#include <pulse/error.h>

extern long samplerate;
extern void  *dsp_fd;

short int buf[441000];        /* 10 secs buffer */
int bufpos = 0;

void *open_dsp () {
      static int opened = 0;

      /* with PA we only open the device once and then leave it
         opened */
      if (opened) {
            return dsp_fd;

      /* The Sample format to use */
      static const pa_sample_spec ss = {
            .format = PA_SAMPLE_S16LE,
            .rate = 44100,
            .channels = 1
      pa_simple *s = NULL;
      int error;

      if (!(s = pa_simple_new(NULL, "qrq", PA_STREAM_PLAYBACK, NULL, 
                        "playback", &ss, NULL, NULL, &error))) {
              fprintf(stderr, "pa_simple_new() failed: %s\n", 

      opened = 1;
      return s;

/* actually just puts samples into the buffer that is played at the end 
(close_audio) */
void write_audio (void *bla, int *in, int size) {
      int i = 0;
      for (i=0; i < size/sizeof(int); i++) {
            buf[bufpos] = (short int) in[i];

void close_audio (void *s) {
      int e;
      pa_simple_write(s, buf, bufpos*sizeof(short int), &e);
      bufpos = 0;

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