gstreamer/ext/hal/gsthalaudiosink.c

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/* GStreamer
* (c) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
* (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.
*/
/**
* SECTION:element-halaudiosink
*
* <refsect2>
* <para>
* HalAudioSink allows access to output of sound devices by specifying the
* corresponding persistent Unique Device Id (UDI) from the Hardware Abstraction
* Layer (HAL) in the <link linkend="GstHalAudioSrc--udi">udi</link> property.
* It currently always embeds alsasink as HAL doesn't support other sound
* systems yet.
* </para>
* <title>Examples</title>
* <para>
* To list the UDIs of all your ALSA output devices :
* <programlisting>
* hal-find-by-property --key alsa.type --string playback
* </programlisting>
* Here is a pipeline to test your sound output :
* <programlisting>
* gst-launch -v audiotestsrc ! halaudiosink udi=/org/freedesktop/Hal/devices/pci_8086_27d8_alsa_playback_0
* </programlisting>
* This pipeline produces a test signal on the specified sound device.
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gsthalelements.h"
#include "gsthalaudiosink.h"
static void gst_hal_audio_sink_dispose (GObject * object);
static GstStateChangeReturn
gst_hal_audio_sink_change_state (GstElement * element,
GstStateChange transition);
enum
{
PROP_0,
PROP_UDI
};
GST_BOILERPLATE (GstHalAudioSink, gst_hal_audio_sink, GstBin, GST_TYPE_BIN);
static void gst_hal_audio_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_hal_audio_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void
gst_hal_audio_sink_base_init (gpointer klass)
{
GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
GstElementDetails gst_hal_audio_sink_details = {
"HAL audio sink",
"Sink/Audio",
"Audio sink for sound device access via HAL",
"Jürg Billeter <j@bitron.ch>"
};
GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
gst_element_class_add_pad_template (eklass,
gst_static_pad_template_get (&sink_template));
gst_element_class_set_details (eklass, &gst_hal_audio_sink_details);
}
static void
gst_hal_audio_sink_class_init (GstHalAudioSinkClass * klass)
{
GObjectClass *oklass = G_OBJECT_CLASS (klass);
GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
oklass->set_property = gst_hal_audio_sink_set_property;
oklass->get_property = gst_hal_audio_sink_get_property;
oklass->dispose = gst_hal_audio_sink_dispose;
eklass->change_state = gst_hal_audio_sink_change_state;
g_object_class_install_property (oklass, PROP_UDI,
g_param_spec_string ("udi",
"UDI", "Unique Device Id", NULL, G_PARAM_READWRITE));
}
/*
* Hack to make negotiation work.
*/
static void
gst_hal_audio_sink_reset (GstHalAudioSink * sink)
{
GstPad *targetpad;
/* fakesink */
if (sink->kid) {
gst_element_set_state (sink->kid, GST_STATE_NULL);
gst_bin_remove (GST_BIN (sink), sink->kid);
}
sink->kid = gst_element_factory_make ("fakesink", "testsink");
gst_bin_add (GST_BIN (sink), sink->kid);
targetpad = gst_element_get_pad (sink->kid, "sink");
gst_ghost_pad_set_target (GST_GHOST_PAD (sink->pad), targetpad);
gst_object_unref (targetpad);
}
static void
gst_hal_audio_sink_init (GstHalAudioSink * sink, GstHalAudioSinkClass * g_class)
{
sink->pad = gst_ghost_pad_new_no_target ("sink", GST_PAD_SINK);
gst_element_add_pad (GST_ELEMENT (sink), sink->pad);
gst_hal_audio_sink_reset (sink);
}
static void
gst_hal_audio_sink_dispose (GObject * object)
{
GstHalAudioSink *sink = GST_HAL_AUDIO_SINK (object);
if (sink->udi) {
g_free (sink->udi);
sink->udi = NULL;
}
GST_CALL_PARENT (G_OBJECT_CLASS, dispose, (object));
}
static gboolean
do_toggle_element (GstHalAudioSink * sink)
{
GstPad *targetpad;
/* kill old element */
if (sink->kid) {
GST_DEBUG_OBJECT (sink, "Removing old kid");
gst_element_set_state (sink->kid, GST_STATE_NULL);
gst_bin_remove (GST_BIN (sink), sink->kid);
sink->kid = NULL;
}
GST_DEBUG_OBJECT (sink, "Creating new kid");
if (!(sink->kid = gst_hal_get_audio_sink (sink->udi))) {
GST_ELEMENT_ERROR (sink, LIBRARY, SETTINGS, (NULL),
("Failed to render audio sink from Hal"));
return FALSE;
}
gst_element_set_state (sink->kid, GST_STATE (sink));
gst_bin_add (GST_BIN (sink), sink->kid);
/* re-attach ghostpad */
GST_DEBUG_OBJECT (sink, "Creating new ghostpad");
targetpad = gst_element_get_pad (sink->kid, "sink");
gst_ghost_pad_set_target (GST_GHOST_PAD (sink->pad), targetpad);
gst_object_unref (targetpad);
GST_DEBUG_OBJECT (sink, "done changing hal audio sink");
return TRUE;
}
static void
gst_hal_audio_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstHalAudioSink *this = GST_HAL_AUDIO_SINK (object);
GST_OBJECT_LOCK (this);
switch (prop_id) {
case PROP_UDI:
if (this->udi)
g_free (this->udi);
this->udi = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (this);
}
static void
gst_hal_audio_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstHalAudioSink *this = GST_HAL_AUDIO_SINK (object);
GST_OBJECT_LOCK (this);
switch (prop_id) {
case PROP_UDI:
g_value_set_string (value, this->udi);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (this);
}
static GstStateChangeReturn
gst_hal_audio_sink_change_state (GstElement * element,
GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstHalAudioSink *sink = GST_HAL_AUDIO_SINK (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (!do_toggle_element (sink))
return GST_STATE_CHANGE_FAILURE;
break;
default:
break;
}
ret = GST_CALL_PARENT_WITH_DEFAULT (GST_ELEMENT_CLASS, change_state,
(element, transition), GST_STATE_CHANGE_SUCCESS);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
gst_hal_audio_sink_reset (sink);
break;
default:
break;
}
return ret;
}