[pulseaudio-discuss] Doc example

[Scott Sibley]

On Mon, Jun 14, 2010 at 3:28 AM, Colin Guthrie <gmane at colin.guthr.ie> wrote:

> 'Twas brillig, and Scott Sibley at 14/06/10 08:56 did gyre and gimble:
> > Hello. I'm writing a pulseaudio plugin for a visualization project, and
> > I'm going by the recording example from the pulseaudio documentation.
> > That example fails to print anything. There's another visualization
> > project that uses the async API, and it works fine on my computer, so I
> > think pulseaudio is working correctly. What might I be missing to get
> > the simple API example working?
> >
> > Here's how I compiled the example.
> >
> > gcc -o test test.c `pkg-config --libs --cflags libpulse libpulse-simple`
>
>
> Did you mean to include some example code with this?
>
> Col
>
> --
>
> Colin Guthrie
> gmane(at)colin.guthr.ie
> http://colin.guthr.ie/
>
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No I didn't. I'm speaking of the example that comes with the pulse audio
documentation. The recording example.

Here's that example:

/***
  This file is part of PulseAudio.

  PulseAudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published
  by the Free Software Foundation; either version 2.1 of the License,
  or (at your option) any later version.

  PulseAudio 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 Lesser General Public License
  along with PulseAudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

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

#include <pulse/simple.h>
#include <pulse/error.h>
#include <pulse/gccmacro.h>

#define BUFSIZE 1024

/* A simple routine calling UNIX write() in a loop */
static ssize_t loop_write(int fd, const void*data, size_t size) {
    ssize_t ret = 0;

    while (size > 0) {
        ssize_t r;

        if ((r = write(fd, data, size)) < 0)
            return r;

        if (r == 0)
            break;

        ret += r;
        data = (const uint8_t*) data + r;
        size -= (size_t) r;
    }

    return ret;
}

int main(int argc, char*argv[]) {
    /* The sample type to use */
    static const pa_sample_spec ss = {
        .format = PA_SAMPLE_S16LE,
        .rate = 44100,
        .channels = 2
    };
    pa_simple *s = NULL;
    int ret = 1;
    int error;

    /* Create the recording stream */
    if (!(s = pa_simple_new(NULL, argv[0], PA_STREAM_RECORD, NULL, "record",
&ss, NULL, NULL, &error))) {
        fprintf(stderr, __FILE__": pa_simple_new() failed: %s\n",
pa_strerror(error));
        goto finish;
    }

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

        /* Record some data ... */
        if (pa_simple_read(s, buf, sizeof(buf), &error) < 0) {
            fprintf(stderr, __FILE__": pa_simple_read() failed: %s\n",
pa_strerror(error));
            goto finish;
        }

        /* And write it to STDOUT */
        if (loop_write(STDOUT_FILENO, buf, sizeof(buf)) != sizeof(buf)) {
            fprintf(stderr, __FILE__": write() failed: %s\n",
strerror(errno));
            goto finish;
        }
    }

    ret = 0;

finish:

    if (s)
        pa_simple_free(s);

    return ret;
}
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