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/* GStreamer
* Copyright (C) <2002> Thomas Vander Stichele <thomas@apestaart.org>
* Copyright (C) <2006> Jürg Billeter <j@bitron.ch>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* this library handles interaction with Hal
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <glib.h>
#include "hal.h"
/* external functions */
/**
* gst_hal_get_string:
* @key: a #gchar corresponding to the key you want to get.
*
* Get Hal UDI @udi's string value.
*
* Returns: a newly allocated #gchar string containing the appropriate pipeline
* for UDI @udi, or NULL in the case of an error..
*/
static gchar *
gst_hal_get_string (const gchar * udi)
{
DBusConnection *connection;
DBusError error;
LibHalContext *ctx;
char *string;
/* Don't query HAL for NULL UDIs. Passing NULL as UDI to HAL gives
* an assertion failure in D-Bus when running with
* DBUS_FATAL_WARNINGS=1. */
if (!udi)
return NULL;
dbus_error_init (&error);
connection = dbus_bus_get (DBUS_BUS_SYSTEM, &error);
g_return_val_if_fail (connection != NULL, NULL);
ctx = libhal_ctx_new ();
g_return_val_if_fail (ctx != NULL, NULL);
libhal_ctx_set_dbus_connection (ctx, connection);
libhal_ctx_init (ctx, &error);
string = NULL;
if (libhal_device_query_capability (ctx, udi, "alsa", &error)) {
char *type, *element = NULL;
type = libhal_device_get_property_string (ctx, udi, "alsa.type", &error);
if (type != NULL && strcmp (type, "playback") == 0) {
element = "alsasink";
} else if (type != NULL && strcmp (type, "capture") == 0) {
element = "alsasrc";
}
if (element) {
int card, device;
card = libhal_device_get_property_int (ctx, udi, "alsa.card", &error);
device = libhal_device_get_property_int (ctx, udi, "alsa.device", &error);
if (device == 0) {
/* handle default device specially to use
* dmix, dsnoop, and softvol if appropriate */
string = g_strdup_printf ("%s device=default:%d", element, card);
} else {
string =
g_strdup_printf ("%s device=plughw:%d,%d", element, card, device);
}
}
}
libhal_ctx_shutdown (ctx, &error);
libhal_ctx_free (ctx);
dbus_error_free (&error);
if (string == NULL) {
GST_WARNING ("Problem parsing HAL ALSA capabilities for udi %s", udi);
}
return string;
}
/**
* gst_hal_render_bin_from_udi:
* @key: a #gchar string corresponding to a Hal UDI.
*
* Render bin from Hal UDI @udi.
*
* Returns: a #GstElement containing the rendered bin.
*/
GstElement *
gst_hal_render_bin_from_udi (const gchar * udi)
{
GstElement *bin = NULL;
gchar *value;
value = gst_hal_get_string (udi);
if (value)
bin = gst_parse_bin_from_description (value, TRUE, NULL);
g_free (value);
return bin;
}
/**
* gst_hal_get_audio_sink:
*
* Render audio output bin from GStreamer Hal UDI.
* If no device with the specified UDI exists, the default audio sink for the
* platform is used (typically osssink or sunaudiosink).
*
* Returns: a #GstElement containing the audio output bin, or NULL if
* everything failed.
*/
GstElement *
gst_hal_get_audio_sink (const gchar * udi)
{
GstElement *ret = gst_hal_render_bin_from_udi (udi);
if (!ret) {
ret = gst_element_factory_make (DEFAULT_AUDIOSINK, NULL);
if (!ret)
g_warning ("No Hal default audio sink key and %s doesn't work",
DEFAULT_AUDIOSINK);
}
return ret;
}
/**
* gst_hal_get_audio_src:
*
* Render audio acquisition bin from GStreamer Hal UDI.
* If no device with the specified UDI exists, the default audio source for the
* plaform is used (typically osssrc or sunaudiosrc).
*
* Returns: a #GstElement containing the audio source bin, or NULL if
* everything failed.
*/
GstElement *
gst_hal_get_audio_src (const gchar * udi)
{
GstElement *ret = gst_hal_render_bin_from_udi (udi);
if (!ret) {
ret = gst_element_factory_make (DEFAULT_AUDIOSRC, NULL);
if (!ret)
g_warning ("No Hal default audio src key and %s doesn't work",
DEFAULT_AUDIOSRC);
}
return ret;
}
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