[maemo-developers] Maemo 5 - Playing sounds from Qt

[From: Topi Hukkanen]

Is even Phonon really used for snappy/lightweight audio playback?

It *appears* that PulseAudio is usable according to here:
http://maemo.org/development/sdks/maemo_5_api_documentation/

With the code below on host, I can get a wav file to play.  That same wav
file won't play when I move everything to scratchbox...  I get the
following...

[sbox-FREMANTLE_X86: ~/test2] > fakeroot run-standalone.sh ./test2 cat1.wav
main.cpp: pa_simple_new() failed: Connection refused

Does anyone know what could be wrong?

I compiled with qmake -project and added the pulseaudio-simple library with
LIBS+=

--------------------CODE START------------------

/***
  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 <fcntl.h>

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

#define BUFSIZE 1024

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

    /* The Sample format to use */
    /*static const pa_sample_spec ss = {
        .format = PA_SAMPLE_S16LE,
        .rate = 44100,
        .channels = 2
    };*/

    static const pa_sample_spec ss = {PA_SAMPLE_U8, 22050, 1};

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

    /* replace STDIN with the specified file if needed */
    if (argc > 1) {
        int fd;

        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,
"playback", &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;
}


------------------CODE END-------------------

On Wed, Oct 28, 2009 at 5:31 PM, Antonio Aloisio
<antonio.aloisio at gmail.com>wrote:

> Hi,
> You can use phonon to play video and sound with Qt for fremantle.
> It's available in current 4.5 community port as well as in the official 4.6
> port.
> It's cross-platform, anyhow you can read more about that at:
> http://doc.trolltech.com/4.5/phonon-overview.html
>
> Br,
> Antonio
>
>
> On Wed, Oct 28, 2009 at 5:12 PM, Tim Teulings <rael at edge.ping.de> wrote:
>
>> Hello!
>>
>> > Isn't it a bit of an overkill to set up an entire GST pipeline just to
>> > play
>> > a blip sound?
>>
>> Yes, but if you want to play your own sound or any sound on the filesystem
>> this seems the
>> way to go (libcanberra is for predefined sounds for predefined events).
>> Lower level ways are likely forbitten, higher level ways likely require
>> more code.
>>
>> > Is there something more lightweight?
>>
>> You can use "playbin" (or playbin2?) for simplifing the pipeline building
>> process. That still
>> makes it a number of lines of code (but of course you will wrap that into
>> a
>> helper method :-)).
>>
>> --
>> Gruß...
>>    Tim
>> _______________________________________________
>> maemo-developers mailing list
>> maemo-developers at maemo.org
>> https://lists.maemo.org/mailman/listinfo/maemo-developers
>>
>
>
>
> --
>
> Pablo Picasso<http://www.brainyquote.com/quotes/authors/p/pablo_picasso.html> - "Computers are useless. They can only give you answers."
> _______________________________________________
> maemo-developers mailing list
> maemo-developers at maemo.org
> https://lists.maemo.org/mailman/listinfo/maemo-developers
>
>
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