/* GStreamer * (c) 2005 Ronald S. Bultje * (c) 2006 Jürg Billeter * * 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 udi property. * It currently always embeds alsasink as HAL doesn't support other sound * systems yet. * * Examples * * To list the UDIs of all your ALSA output devices : * * hal-find-by-property --key alsa.type --string playback * * Here is a pipeline to test your sound output : * * gst-launch -v audiotestsrc ! halaudiosink udi=/org/freedesktop/Hal/devices/pci_8086_27d8_alsa_playback_0 * * This pipeline produces a test signal on the specified sound device. * * */ #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 = GST_ELEMENT_DETAILS ("HAL audio sink", "Sink/Audio", "Audio sink for sound device access via HAL", "Jürg Billeter "); 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; }