audio_output_ao.c

Go to the documentation of this file.

/*
 * Copyright (c) 2006-2009 Ed Schouten <ed@80386.nl>
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
#include "stdinc.h"

#include <ao/ao.h>

#include "audio_file.h"
#include "audio_output.h"
#include "config.h"
#include "gui.h"

static ao_device*       devptr = NULL;
static ao_sample_format devfmt;
static ao_option        *devopt = NULL;

int
audio_output_open(void)
{
        const char *host;
        char *henv, *hend;

        ao_initialize();

        /* We always expect 16 bits native endian PCM */
        devfmt.bits = 16;
        devfmt.byte_format = AO_FMT_NATIVE;

        host = config_getopt("audio.output.ao.host");
        if (strcmp(host, "env_ssh") == 0) {
                /* Fetch "host" option from SSH_CLIENT variable */
                henv = g_strdup(getenv("SSH_CLIENT"));
                if (henv != NULL) {
                        /* Remove the trailing port number */
                        if ((hend = strchr(henv, ' ')) != NULL)
                                *hend = '\0';
                        ao_append_option(&devopt, "host", henv);
                        g_free(henv);
                }
        } else if (host[0] != '\0') {
                /* Use the value as the hostname */
                ao_append_option(&devopt, "host", host);
        }

        return (0);
}

int
audio_output_play(struct audio_file *fd)
{
        const char *drvname;
        int16_t buf[2048];
        int len, drvnum;

        if ((len = audio_file_read(fd, buf, sizeof buf / sizeof(int16_t))) == 0)
                return (-1);

        if ((unsigned int)devfmt.rate != fd->srate ||
            (unsigned int)devfmt.channels != fd->channels) {
                /* Sample rate or amount of channels has changed */
                audio_output_close();

                devfmt.rate = fd->srate;
                devfmt.channels = fd->channels;
        }

        if (devptr == NULL) {
                drvname = config_getopt("audio.output.ao.driver");
                if (drvname[0] != '\0') {
                        /* User specified driver */
                        drvnum = ao_driver_id(drvname);
                } else {
                        /* Default driver */
                        drvnum = ao_default_driver_id();
                }

                devptr = ao_open_live(drvnum, &devfmt, devopt);
                if (devptr == NULL) {
                        gui_msgbar_warn(_("Cannot open the audio device."));
                        return (-1);
                }
        }

        if (ao_play(devptr, (char *)buf, len * sizeof(int16_t)) == 0) {
                /* No success - device must be closed */
                audio_output_close();
                return (-1);
        }

        return (0);
}

void
audio_output_close(void)
{
        if (devptr != NULL) {
                /* Close device */
                ao_close(devptr);
                devptr = NULL;
        }
}

---