/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2000 Wim Taymans * 2005 Wim Taymans * 2005 David Schleef * * 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-capsfilter * * The element does not modify data as such, but can enforce limitations on the * data format. * * * Example launch line * |[ * gst-launch videotestsrc ! video/x-raw-gray ! ffmpegcolorspace ! autovideosink * ]| Limits acceptable video from videotestsrc to be grayscale. * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "../../gst/gst-i18n-lib.h" #include "gstcapsfilter.h" enum { PROP_0, PROP_FILTER_CAPS }; static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); GST_DEBUG_CATEGORY_STATIC (gst_capsfilter_debug); #define GST_CAT_DEFAULT gst_capsfilter_debug #define _do_init \ GST_DEBUG_CATEGORY_INIT (gst_capsfilter_debug, "capsfilter", 0, \ "capsfilter element"); #define gst_capsfilter_parent_class parent_class G_DEFINE_TYPE_WITH_CODE (GstCapsFilter, gst_capsfilter, GST_TYPE_BASE_TRANSFORM, _do_init); static void gst_capsfilter_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_capsfilter_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_capsfilter_dispose (GObject * object); static GstCaps *gst_capsfilter_transform_caps (GstBaseTransform * base, GstPadDirection direction, GstCaps * caps, GstCaps * filter); static gboolean gst_capsfilter_accept_caps (GstBaseTransform * base, GstPadDirection direction, GstCaps * caps); static GstFlowReturn gst_capsfilter_transform_ip (GstBaseTransform * base, GstBuffer * buf); static GstFlowReturn gst_capsfilter_prepare_buf (GstBaseTransform * trans, GstBuffer * input, GstBuffer ** buf); static void gst_capsfilter_class_init (GstCapsFilterClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; GstBaseTransformClass *trans_class; gobject_class = G_OBJECT_CLASS (klass); gobject_class->set_property = gst_capsfilter_set_property; gobject_class->get_property = gst_capsfilter_get_property; gobject_class->dispose = gst_capsfilter_dispose; g_object_class_install_property (gobject_class, PROP_FILTER_CAPS, g_param_spec_boxed ("caps", _("Filter caps"), _("Restrict the possible allowed capabilities (NULL means ANY). " "Setting this property takes a reference to the supplied GstCaps " "object."), GST_TYPE_CAPS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gstelement_class = GST_ELEMENT_CLASS (klass); gst_element_class_set_details_simple (gstelement_class, "CapsFilter", "Generic", "Pass data without modification, limiting formats", "David Schleef "); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&srctemplate)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&sinktemplate)); trans_class = GST_BASE_TRANSFORM_CLASS (klass); trans_class->transform_caps = GST_DEBUG_FUNCPTR (gst_capsfilter_transform_caps); trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_capsfilter_transform_ip); trans_class->accept_caps = GST_DEBUG_FUNCPTR (gst_capsfilter_accept_caps); trans_class->prepare_output_buffer = GST_DEBUG_FUNCPTR (gst_capsfilter_prepare_buf); } static void gst_capsfilter_init (GstCapsFilter * filter) { GstBaseTransform *trans = GST_BASE_TRANSFORM (filter); gst_base_transform_set_gap_aware (trans, TRUE); filter->filter_caps = gst_caps_new_any (); } static void gst_capsfilter_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstCapsFilter *capsfilter = GST_CAPSFILTER (object); switch (prop_id) { case PROP_FILTER_CAPS:{ GstCaps *new_caps; GstCaps *old_caps; const GstCaps *new_caps_val = gst_value_get_caps (value); if (new_caps_val == NULL) { new_caps = gst_caps_new_any (); } else { new_caps = (GstCaps *) new_caps_val; gst_caps_ref (new_caps); } GST_OBJECT_LOCK (capsfilter); old_caps = capsfilter->filter_caps; capsfilter->filter_caps = new_caps; GST_OBJECT_UNLOCK (capsfilter); gst_caps_unref (old_caps); GST_DEBUG_OBJECT (capsfilter, "set new caps %" GST_PTR_FORMAT, new_caps); gst_base_transform_reconfigure_sink (GST_BASE_TRANSFORM (object)); break; } default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_capsfilter_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstCapsFilter *capsfilter = GST_CAPSFILTER (object); switch (prop_id) { case PROP_FILTER_CAPS: GST_OBJECT_LOCK (capsfilter); gst_value_set_caps (value, capsfilter->filter_caps); GST_OBJECT_UNLOCK (capsfilter); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_capsfilter_dispose (GObject * object) { GstCapsFilter *filter = GST_CAPSFILTER (object); gst_caps_replace (&filter->filter_caps, NULL); G_OBJECT_CLASS (parent_class)->dispose (object); } static GstCaps * gst_capsfilter_transform_caps (GstBaseTransform * base, GstPadDirection direction, GstCaps * caps, GstCaps * filter) { GstCapsFilter *capsfilter = GST_CAPSFILTER (base); GstCaps *ret, *filter_caps, *tmp; GST_OBJECT_LOCK (capsfilter); filter_caps = gst_caps_ref (capsfilter->filter_caps); GST_OBJECT_UNLOCK (capsfilter); if (filter) { tmp = gst_caps_intersect_full (filter, filter_caps, GST_CAPS_INTERSECT_FIRST); gst_caps_unref (filter_caps); filter_caps = tmp; } ret = gst_caps_intersect_full (filter_caps, caps, GST_CAPS_INTERSECT_FIRST); GST_DEBUG_OBJECT (capsfilter, "input: %" GST_PTR_FORMAT, caps); GST_DEBUG_OBJECT (capsfilter, "filter: %" GST_PTR_FORMAT, filter); GST_DEBUG_OBJECT (capsfilter, "caps filter: %" GST_PTR_FORMAT, filter_caps); GST_DEBUG_OBJECT (capsfilter, "intersect: %" GST_PTR_FORMAT, ret); gst_caps_unref (filter_caps); return ret; } static gboolean gst_capsfilter_accept_caps (GstBaseTransform * base, GstPadDirection direction, GstCaps * caps) { GstCapsFilter *capsfilter = GST_CAPSFILTER (base); GstCaps *filter_caps; gboolean ret; GST_OBJECT_LOCK (capsfilter); filter_caps = gst_caps_ref (capsfilter->filter_caps); GST_OBJECT_UNLOCK (capsfilter); ret = gst_caps_can_intersect (caps, filter_caps); GST_DEBUG_OBJECT (capsfilter, "can intersect: %d", ret); if (ret) { /* if we can intersect, see if the other end also accepts */ if (direction == GST_PAD_SRC) ret = gst_pad_peer_query_accept_caps (GST_BASE_TRANSFORM_SINK_PAD (base), caps); else ret = gst_pad_peer_query_accept_caps (GST_BASE_TRANSFORM_SRC_PAD (base), caps); GST_DEBUG_OBJECT (capsfilter, "peer accept: %d", ret); } gst_caps_unref (filter_caps); return ret; } static GstFlowReturn gst_capsfilter_transform_ip (GstBaseTransform * base, GstBuffer * buf) { /* No actual work here. It's all done in the prepare output buffer * func. */ return GST_FLOW_OK; } /* Output buffer preparation... if the buffer has no caps, and * our allowed output caps is fixed, then give the caps to the * buffer. * This ensures that outgoing buffers have caps if we can, so * that pipelines like: * gst-launch filesrc location=rawsamples.raw ! * audio/x-raw-int,width=16,depth=16,rate=48000,channels=2, * endianness=4321,signed='(boolean)'true ! alsasink * will work. */ static GstFlowReturn gst_capsfilter_prepare_buf (GstBaseTransform * trans, GstBuffer * input, GstBuffer ** buf) { GstFlowReturn ret = GST_FLOW_OK; /* always return the input as output buffer */ *buf = input; if (!gst_pad_has_current_caps (trans->sinkpad)) { /* Buffer has no caps. See if the output pad only supports fixed caps */ GstCaps *out_caps; GST_LOG_OBJECT (trans, "Input pad does not have caps"); out_caps = gst_pad_get_current_caps (trans->srcpad); if (out_caps == NULL) { out_caps = gst_pad_get_allowed_caps (trans->srcpad); g_return_val_if_fail (out_caps != NULL, GST_FLOW_ERROR); } out_caps = gst_caps_simplify (out_caps); if (gst_caps_is_fixed (out_caps) && !gst_caps_is_empty (out_caps)) { GST_DEBUG_OBJECT (trans, "Have fixed output caps %" GST_PTR_FORMAT " to apply to srcpad", out_caps); if (!gst_pad_has_current_caps (trans->srcpad)) gst_pad_push_event (trans->srcpad, gst_event_new_caps (out_caps)); gst_caps_unref (out_caps); } else { gchar *caps_str = gst_caps_to_string (out_caps); GST_DEBUG_OBJECT (trans, "Cannot choose caps. Have unfixed output caps %" GST_PTR_FORMAT, out_caps); gst_caps_unref (out_caps); ret = GST_FLOW_ERROR; GST_ELEMENT_ERROR (trans, STREAM, FORMAT, ("Filter caps do not completely specify the output format"), ("Output caps are unfixed: %s", caps_str)); g_free (caps_str); } } return ret; }