pulseaudio.cc

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/*                Centre for Speech Technology Research                  */
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/*************************************************************************/
/*                Author :  Michal Schmidt                               */
/*                Date   :  November 2008                                */
/*-----------------------------------------------------------------------*/
/*  Optional support for PulseAudio                                      */
/*=======================================================================*/

#include "EST_Wave.h"
#include "EST_Option.h"
#include "audioP.h"

using namespace std;

#ifdef SUPPORT_PULSE

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

int pulse_supported = TRUE;
const static char *err_prefix = "Pulseaudio: ";

static int transfer_pulse_wave(EST_Wave &inwave, EST_Option &al, int record)
{
    (void) al;
    short *waveform;
    int num_samples;
    int err, pa_ret;
    int ret = -1;
    pa_simple *s = NULL;
    pa_sample_spec ss;

    ss.format   = PA_SAMPLE_S16NE;
    ss.channels = 1;
    ss.rate     = inwave.sample_rate();

    waveform    = inwave.values().memory();
    num_samples = inwave.num_samples();

    /* In case num_samples == 0, don't play. Pulseaudio returns "invalid
     * argument" if num_samples == 0, so it's better to check now.
     * I don't expect num_samples < 0, but as we have to check anyway
     * it doesn't hurt to check.
     */
    if (num_samples <= 0) {
        ret=1;
        goto finish;
    }

    s = pa_simple_new(NULL,           // Use the default server.
    "Festival",                   // Our application's name.
    record ? PA_STREAM_RECORD : PA_STREAM_PLAYBACK,
    NULL,                         // Use the default device.
    record ? "Record" : "Speech", // Description of our stream.
    &ss,                // Our sample format.
    NULL,               // Use default channel map
    NULL,               // Use default buffering attributes.
    &err);

    if (!s) {
    cerr << err_prefix << pa_strerror(err) << endl;
    goto finish;
    }

    pa_ret = record ?
    pa_simple_read (s, waveform, num_samples*sizeof(short), &err) :
    pa_simple_write(s, waveform, num_samples*sizeof(short), &err);

    if (pa_ret < 0) {
    cerr << err_prefix << pa_strerror(err) << endl;
    goto finish;
    }

    if (!record && pa_simple_drain(s, &err) < 0) {
    cerr << err_prefix << pa_strerror(err) << endl;
    goto finish;
    }

    ret = 1;
finish:
    if (s)
    pa_simple_free(s);
    return ret;
}

int play_pulse_wave(EST_Wave &inwave, EST_Option &al)
{
    return transfer_pulse_wave(inwave, al, 0);
}

int record_pulse_wave(EST_Wave &inwave, EST_Option &al)
{
    return transfer_pulse_wave(inwave, al, 1);
}

#else
int pulse_supported = FALSE;

int play_pulse_wave(EST_Wave &inwave, EST_Option &al)
{
    (void)inwave;
    (void)al;
    cerr << "Audio: pulse not compiled in this version" << endl;
    return -1;
}

int record_pulse_wave(EST_Wave &inwave, EST_Option &al)
{
    (void)inwave;
    (void)al;
    cerr << "Audio: pulse not compiled in this version" << endl;
    return -1;
}

#endif