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2f5ed9e29d
When we have an input buffer with caps and when those caps are different from the caps we want, only then make a writable copy of the input buffer as the output buffer and set the caps on that output buffer. This avoids some cases where we took a subbuffer for setting caps that were the same.
373 lines
12 KiB
C
373 lines
12 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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#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(bla) \
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GST_DEBUG_CATEGORY_INIT (gst_capsfilter_debug, "capsfilter", 0, \
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"capsfilter element");
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GST_BOILERPLATE_FULL (GstCapsFilter, gst_capsfilter, GstBaseTransform,
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GST_TYPE_BASE_TRANSFORM, _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);
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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, gint size, GstCaps * caps, GstBuffer ** buf);
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static gboolean gst_capsfilter_transform_size (GstBaseTransform * trans,
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GstPadDirection direction, GstCaps * caps, guint size,
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GstCaps * othercaps, guint * othersize);
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static void
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gst_capsfilter_base_init (gpointer g_class)
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{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details_simple (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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}
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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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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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trans_class = GST_BASE_TRANSFORM_CLASS (klass);
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trans_class->transform_caps = gst_capsfilter_transform_caps;
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trans_class->transform_ip = gst_capsfilter_transform_ip;
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trans_class->prepare_output_buffer = gst_capsfilter_prepare_buf;
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trans_class->transform_size = gst_capsfilter_transform_size;
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}
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static void
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gst_capsfilter_init (GstCapsFilter * filter, GstCapsFilterClass * g_class)
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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 gboolean
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copy_func (GQuark field_id, const GValue * value, GstStructure * dest)
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{
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gst_structure_id_set_value (dest, field_id, value);
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return TRUE;
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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, *suggest, *nego;
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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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/* filter the currently negotiated format against the new caps */
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GST_OBJECT_LOCK (GST_BASE_TRANSFORM_SINK_PAD (object));
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nego = GST_PAD_CAPS (GST_BASE_TRANSFORM_SINK_PAD (object));
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if (nego) {
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GST_DEBUG_OBJECT (capsfilter, "we had negotiated caps %" GST_PTR_FORMAT,
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nego);
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if (G_UNLIKELY (gst_caps_is_any (new_caps))) {
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GST_DEBUG_OBJECT (capsfilter, "not settings any suggestion");
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suggest = NULL;
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} else {
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GstStructure *s1, *s2;
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/* first check if the name is the same */
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s1 = gst_caps_get_structure (nego, 0);
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s2 = gst_caps_get_structure (new_caps, 0);
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if (gst_structure_get_name_id (s1) == gst_structure_get_name_id (s2)) {
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/* same name, copy all fields from the new caps into the previously
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* negotiated caps */
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suggest = gst_caps_copy (nego);
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s1 = gst_caps_get_structure (suggest, 0);
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gst_structure_foreach (s2, (GstStructureForeachFunc) copy_func, s1);
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GST_DEBUG_OBJECT (capsfilter, "copied structure fields");
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} else {
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GST_DEBUG_OBJECT (capsfilter, "different structure names");
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/* different names, we can only suggest the complete caps */
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suggest = gst_caps_copy (new_caps);
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}
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}
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} else {
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GST_DEBUG_OBJECT (capsfilter, "no negotiated caps");
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/* no previous caps, the getcaps function will be used to find suitable
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* caps */
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suggest = NULL;
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}
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GST_OBJECT_UNLOCK (GST_BASE_TRANSFORM_SINK_PAD (object));
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GST_DEBUG_OBJECT (capsfilter, "suggesting new caps %" GST_PTR_FORMAT,
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suggest);
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gst_base_transform_suggest (GST_BASE_TRANSFORM (object), suggest, 0);
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if (suggest)
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gst_caps_unref (suggest);
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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)
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{
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GstCapsFilter *capsfilter = GST_CAPSFILTER (base);
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GstCaps *ret, *filter_caps;
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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_intersect (caps, filter_caps);
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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_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_transform_size (GstBaseTransform * trans,
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GstPadDirection direction, GstCaps * caps, guint size,
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GstCaps * othercaps, guint * othersize)
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{
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/* return the same size */
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*othersize = size;
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return TRUE;
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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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gint size, GstCaps * caps, GstBuffer ** buf)
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{
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GstFlowReturn ret = GST_FLOW_OK;
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if (GST_BUFFER_CAPS (input) != NULL) {
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/* Output buffer already has caps */
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GST_LOG_OBJECT (trans, "Input buffer already has caps (implicitely fixed)");
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/* FIXME : Move this behaviour to basetransform. The given caps are the ones
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* of the source pad, therefore our outgoing buffers should always have
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* those caps. */
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if (GST_BUFFER_CAPS (input) != caps) {
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/* caps are different, make a metadata writable output buffer to set
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* caps */
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if (gst_buffer_is_metadata_writable (input)) {
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/* input is writable, just set caps and use this as the output */
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*buf = input;
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gst_buffer_set_caps (*buf, caps);
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gst_buffer_ref (input);
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} else {
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GST_DEBUG_OBJECT (trans, "Creating sub-buffer and setting caps");
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*buf = gst_buffer_create_sub (input, 0, GST_BUFFER_SIZE (input));
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gst_buffer_set_caps (*buf, caps);
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}
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} else {
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/* caps are right, just use a ref of the input as the outbuf */
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*buf = input;
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gst_buffer_ref (input);
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}
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} else {
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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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out_caps = GST_PAD_CAPS (trans->srcpad);
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if (out_caps != NULL) {
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gst_caps_ref (out_caps);
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} else {
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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_make_writable (out_caps);
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gst_caps_do_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 buffer with no caps", out_caps);
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if (gst_buffer_is_metadata_writable (input)) {
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gst_buffer_ref (input);
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*buf = input;
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} else {
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GST_DEBUG_OBJECT (trans, "Creating sub-buffer and setting caps");
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*buf = gst_buffer_create_sub (input, 0, GST_BUFFER_SIZE (input));
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}
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GST_BUFFER_CAPS (*buf) = out_caps;
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if (GST_PAD_CAPS (trans->srcpad) == NULL)
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gst_pad_set_caps (trans->srcpad, 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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