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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
+ *
+ * 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 #GstHalAudioSink:udi property.
+ * It currently always embeds alsasink or osssink as HAL doesn't support other
+ * sound systems yet. You can also specify the UDI of a device that has ALSA or
+ * OSS subdevices. If both are present ALSA is preferred.
+ *
+ * <refsect2>
+ * <title>Examples</title>
+ * |[
+ * hal-find-by-property --key alsa.type --string playback
+ * ]| list the UDIs of all your ALSA output devices
+ * |[
+ * gst-launch -v audiotestsrc ! halaudiosink udi=/org/freedesktop/Hal/devices/pci_8086_27d8_alsa_playback_0
+ * ]| test your soundcard by playing a test signal on the specified sound device.
+ * </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);
+
+ static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS_ANY);
+
+ gst_element_class_add_static_pad_template (eklass, &sink_template);
+ gst_element_class_set_details_simple (eklass, "HAL audio sink",
+ "Sink/Audio",
+ "Audio sink for sound device access via HAL",
+ "Jürg Billeter <j@bitron.ch>");
+}
+
+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 | G_PARAM_STATIC_STRINGS));
+}
+
+/*
+ * 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_static_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->udi)
+ GST_INFO_OBJECT (sink, "No UDI set for device, using default one");
+
+ 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_static_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;
+}
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