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326 lines
10 KiB
C
326 lines
10 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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* 2005 Wim Taymans <wim@fluendo.com>
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* 2005 David Schleef <ds@schleef.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-capsfilter
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*
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* The element does not modify data as such, but can enforce limitations on the
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* data format.
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* gst-launch videotestsrc ! video/x-raw-gray ! ffmpegcolorspace ! autovideosink
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* ]| Limits acceptable video from videotestsrc to be grayscale.
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* </refsect2>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "../../gst/gst-i18n-lib.h"
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#include "gstcapsfilter.h"
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enum
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{
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PROP_0,
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PROP_FILTER_CAPS
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};
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static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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GST_DEBUG_CATEGORY_STATIC (gst_capsfilter_debug);
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#define GST_CAT_DEFAULT gst_capsfilter_debug
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#define _do_init \
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GST_DEBUG_CATEGORY_INIT (gst_capsfilter_debug, "capsfilter", 0, \
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"capsfilter element");
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#define gst_capsfilter_parent_class parent_class
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G_DEFINE_TYPE_WITH_CODE (GstCapsFilter, gst_capsfilter, GST_TYPE_BASE_TRANSFORM,
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_do_init);
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static void gst_capsfilter_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_capsfilter_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_capsfilter_dispose (GObject * object);
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static GstCaps *gst_capsfilter_transform_caps (GstBaseTransform * base,
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GstPadDirection direction, GstCaps * caps, GstCaps * filter);
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static gboolean gst_capsfilter_accept_caps (GstBaseTransform * base,
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GstPadDirection direction, GstCaps * caps);
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static GstFlowReturn gst_capsfilter_transform_ip (GstBaseTransform * base,
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GstBuffer * buf);
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static GstFlowReturn gst_capsfilter_prepare_buf (GstBaseTransform * trans,
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GstBuffer * input, GstBuffer ** buf);
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static void
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gst_capsfilter_class_init (GstCapsFilterClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstBaseTransformClass *trans_class;
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gobject_class = G_OBJECT_CLASS (klass);
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gobject_class->set_property = gst_capsfilter_set_property;
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gobject_class->get_property = gst_capsfilter_get_property;
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gobject_class->dispose = gst_capsfilter_dispose;
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g_object_class_install_property (gobject_class, PROP_FILTER_CAPS,
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g_param_spec_boxed ("caps", _("Filter caps"),
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_("Restrict the possible allowed capabilities (NULL means ANY). "
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"Setting this property takes a reference to the supplied GstCaps "
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"object."), GST_TYPE_CAPS,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gstelement_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_set_static_metadata (gstelement_class,
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"CapsFilter",
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"Generic",
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"Pass data without modification, limiting formats",
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"David Schleef <ds@schleef.org>");
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&srctemplate));
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&sinktemplate));
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trans_class = GST_BASE_TRANSFORM_CLASS (klass);
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trans_class->transform_caps =
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GST_DEBUG_FUNCPTR (gst_capsfilter_transform_caps);
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trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_capsfilter_transform_ip);
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trans_class->accept_caps = GST_DEBUG_FUNCPTR (gst_capsfilter_accept_caps);
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trans_class->prepare_output_buffer =
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GST_DEBUG_FUNCPTR (gst_capsfilter_prepare_buf);
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}
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static void
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gst_capsfilter_init (GstCapsFilter * filter)
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{
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GstBaseTransform *trans = GST_BASE_TRANSFORM (filter);
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gst_base_transform_set_gap_aware (trans, TRUE);
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filter->filter_caps = gst_caps_new_any ();
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}
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static void
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gst_capsfilter_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstCapsFilter *capsfilter = GST_CAPSFILTER (object);
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switch (prop_id) {
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case PROP_FILTER_CAPS:{
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GstCaps *new_caps;
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GstCaps *old_caps;
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const GstCaps *new_caps_val = gst_value_get_caps (value);
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if (new_caps_val == NULL) {
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new_caps = gst_caps_new_any ();
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} else {
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new_caps = (GstCaps *) new_caps_val;
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gst_caps_ref (new_caps);
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}
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GST_OBJECT_LOCK (capsfilter);
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old_caps = capsfilter->filter_caps;
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capsfilter->filter_caps = new_caps;
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GST_OBJECT_UNLOCK (capsfilter);
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gst_caps_unref (old_caps);
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GST_DEBUG_OBJECT (capsfilter, "set new caps %" GST_PTR_FORMAT, new_caps);
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gst_base_transform_reconfigure_sink (GST_BASE_TRANSFORM (object));
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break;
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}
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_capsfilter_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstCapsFilter *capsfilter = GST_CAPSFILTER (object);
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switch (prop_id) {
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case PROP_FILTER_CAPS:
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GST_OBJECT_LOCK (capsfilter);
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gst_value_set_caps (value, capsfilter->filter_caps);
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GST_OBJECT_UNLOCK (capsfilter);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_capsfilter_dispose (GObject * object)
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{
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GstCapsFilter *filter = GST_CAPSFILTER (object);
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gst_caps_replace (&filter->filter_caps, NULL);
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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static GstCaps *
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gst_capsfilter_transform_caps (GstBaseTransform * base,
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GstPadDirection direction, GstCaps * caps, GstCaps * filter)
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{
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GstCapsFilter *capsfilter = GST_CAPSFILTER (base);
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GstCaps *ret, *filter_caps, *tmp;
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GST_OBJECT_LOCK (capsfilter);
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filter_caps = gst_caps_ref (capsfilter->filter_caps);
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GST_OBJECT_UNLOCK (capsfilter);
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if (filter) {
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tmp =
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gst_caps_intersect_full (filter, filter_caps, GST_CAPS_INTERSECT_FIRST);
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gst_caps_unref (filter_caps);
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filter_caps = tmp;
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}
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ret = gst_caps_intersect_full (filter_caps, caps, GST_CAPS_INTERSECT_FIRST);
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GST_DEBUG_OBJECT (capsfilter, "input: %" GST_PTR_FORMAT, caps);
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GST_DEBUG_OBJECT (capsfilter, "filter: %" GST_PTR_FORMAT, filter);
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GST_DEBUG_OBJECT (capsfilter, "caps filter: %" GST_PTR_FORMAT,
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filter_caps);
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GST_DEBUG_OBJECT (capsfilter, "intersect: %" GST_PTR_FORMAT, ret);
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gst_caps_unref (filter_caps);
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return ret;
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}
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static gboolean
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gst_capsfilter_accept_caps (GstBaseTransform * base,
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GstPadDirection direction, GstCaps * caps)
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{
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GstCapsFilter *capsfilter = GST_CAPSFILTER (base);
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GstCaps *filter_caps;
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gboolean ret;
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GST_OBJECT_LOCK (capsfilter);
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filter_caps = gst_caps_ref (capsfilter->filter_caps);
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GST_OBJECT_UNLOCK (capsfilter);
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ret = gst_caps_can_intersect (caps, filter_caps);
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GST_DEBUG_OBJECT (capsfilter, "can intersect: %d", ret);
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if (ret) {
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/* if we can intersect, see if the other end also accepts */
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if (direction == GST_PAD_SRC)
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ret =
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gst_pad_peer_query_accept_caps (GST_BASE_TRANSFORM_SINK_PAD (base),
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caps);
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else
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ret =
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gst_pad_peer_query_accept_caps (GST_BASE_TRANSFORM_SRC_PAD (base),
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caps);
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GST_DEBUG_OBJECT (capsfilter, "peer accept: %d", ret);
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}
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gst_caps_unref (filter_caps);
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return ret;
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}
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static GstFlowReturn
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gst_capsfilter_transform_ip (GstBaseTransform * base, GstBuffer * buf)
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{
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/* No actual work here. It's all done in the prepare output buffer
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* func. */
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return GST_FLOW_OK;
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}
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/* Output buffer preparation... if the buffer has no caps, and
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* our allowed output caps is fixed, then give the caps to the
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* buffer.
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* This ensures that outgoing buffers have caps if we can, so
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* that pipelines like:
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* gst-launch filesrc location=rawsamples.raw !
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* audio/x-raw-int,width=16,depth=16,rate=48000,channels=2,
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* endianness=4321,signed='(boolean)'true ! alsasink
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* will work.
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*/
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static GstFlowReturn
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gst_capsfilter_prepare_buf (GstBaseTransform * trans, GstBuffer * input,
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GstBuffer ** buf)
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{
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GstFlowReturn ret = GST_FLOW_OK;
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/* always return the input as output buffer */
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*buf = input;
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if (!gst_pad_has_current_caps (trans->sinkpad)) {
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/* Buffer has no caps. See if the output pad only supports fixed caps */
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GstCaps *out_caps;
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GST_LOG_OBJECT (trans, "Input pad does not have caps");
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out_caps = gst_pad_get_current_caps (trans->srcpad);
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if (out_caps == NULL) {
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out_caps = gst_pad_get_allowed_caps (trans->srcpad);
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g_return_val_if_fail (out_caps != NULL, GST_FLOW_ERROR);
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}
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out_caps = gst_caps_simplify (out_caps);
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if (gst_caps_is_fixed (out_caps) && !gst_caps_is_empty (out_caps)) {
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GST_DEBUG_OBJECT (trans, "Have fixed output caps %"
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GST_PTR_FORMAT " to apply to srcpad", out_caps);
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if (!gst_pad_has_current_caps (trans->srcpad))
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gst_pad_push_event (trans->srcpad, gst_event_new_caps (out_caps));
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gst_caps_unref (out_caps);
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} else {
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gchar *caps_str = gst_caps_to_string (out_caps);
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GST_DEBUG_OBJECT (trans, "Cannot choose caps. Have unfixed output caps %"
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GST_PTR_FORMAT, out_caps);
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gst_caps_unref (out_caps);
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ret = GST_FLOW_ERROR;
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GST_ELEMENT_ERROR (trans, STREAM, FORMAT,
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("Filter caps do not completely specify the output format"),
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("Output caps are unfixed: %s", caps_str));
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g_free (caps_str);
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}
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}
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return ret;
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}
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