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648 lines
18 KiB
C
648 lines
18 KiB
C
/* GStreamer
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* Copyright (C) <2008> Wim Taymans <wim.taymans@gmail.com>
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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-smptealpha
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*
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* smptealpha can accept an I420 or AYUV video stream. An alpha channel is added
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* using an effect specific SMPTE mask in the I420 input case. In the AYUV case,
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* the alpha channel is modified using the effect specific SMPTE mask.
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*
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* The #GstSmpteAlpha:position property is a controllabe double between 0.0 and
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* 1.0 that specifies the position in the transition. 0.0 is the start of the
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* transition with the alpha channel to complete opaque where 1.0 has the alpha
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* channel set to completely transparent.
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*
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* The #GstSmpteAlpha:depth property defines the precision in bits of the mask.
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* A higher presision will create a mask with smoother gradients in order to
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* avoid banding.
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*
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* <refsect2>
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* <title>Sample pipelines</title>
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* <para>
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* Here is a pipeline to demonstrate the smpte transition :
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* <programlisting>
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* gst-launch -v videotestsrc ! smptealpha border=20000 type=44
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* position=0.5 ! videomixer ! ffmpegcolorspace ! ximagesink
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* </programlisting>
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* This shows a midway bowtie-h transition a from a videotestsrc to a
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* transparent image. The edges of the transition are smoothed with a
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* 20000 big border.
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* </para>
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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 <string.h>
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#include <gst/controller/gstcontroller.h>
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#include "gstsmptealpha.h"
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#include "paint.h"
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GST_DEBUG_CATEGORY_STATIC (gst_smpte_alpha_debug);
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#define GST_CAT_DEFAULT gst_smpte_alpha_debug
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/* elementfactory information */
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static const GstElementDetails smpte_details =
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GST_ELEMENT_DETAILS ("SMPTE transitions",
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"Filter/Editor/Video",
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"Apply the standard SMPTE transitions as alpha on video images",
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"Wim Taymans <wim.taymans@gmail.com>");
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static GstStaticPadTemplate gst_smpte_alpha_src_template =
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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 (GST_VIDEO_CAPS_YUV ("AYUV")
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)
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);
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static GstStaticPadTemplate gst_smpte_alpha_sink_template =
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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 (GST_VIDEO_CAPS_YUV ("I420") ";" GST_VIDEO_CAPS_YUV ("AYUV")
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)
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);
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/* SMPTE signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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#define DEFAULT_PROP_TYPE 1
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#define DEFAULT_PROP_BORDER 0
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#define DEFAULT_PROP_DEPTH 16
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#define DEFAULT_PROP_POSITION 0.0
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enum
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{
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PROP_0,
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PROP_TYPE,
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PROP_BORDER,
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PROP_DEPTH,
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PROP_POSITION,
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PROP_LAST,
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};
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#define AYUV_SIZE(w,h) ((w) * (h) * 4)
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#define GST_TYPE_SMPTE_TRANSITION_TYPE (gst_smpte_alpha_transition_type_get_type())
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static GType
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gst_smpte_alpha_transition_type_get_type (void)
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{
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static GType smpte_transition_type = 0;
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GEnumValue *smpte_transitions;
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if (!smpte_transition_type) {
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const GList *definitions;
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gint i = 0;
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definitions = gst_mask_get_definitions ();
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smpte_transitions =
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g_new0 (GEnumValue, g_list_length ((GList *) definitions) + 1);
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while (definitions) {
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GstMaskDefinition *definition = (GstMaskDefinition *) definitions->data;
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definitions = g_list_next (definitions);
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smpte_transitions[i].value = definition->type;
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/* older GLib versions have the two fields as non-const, hence the cast */
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smpte_transitions[i].value_nick = (gchar *) definition->short_name;
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smpte_transitions[i].value_name = (gchar *) definition->long_name;
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i++;
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}
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smpte_transition_type =
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g_enum_register_static ("GstSMPTEAlphaTransitionType",
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smpte_transitions);
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}
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return smpte_transition_type;
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}
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static void gst_smpte_alpha_class_init (GstSMPTEAlphaClass * klass);
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static void gst_smpte_alpha_base_init (GstSMPTEAlphaClass * klass);
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static void gst_smpte_alpha_init (GstSMPTEAlpha * smpte);
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static void gst_smpte_alpha_finalize (GstSMPTEAlpha * smpte);
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static void gst_smpte_alpha_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_smpte_alpha_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static gboolean gst_smpte_alpha_setcaps (GstBaseTransform * btrans,
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GstCaps * incaps, GstCaps * outcaps);
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static gboolean gst_smpte_alpha_get_unit_size (GstBaseTransform * btrans,
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GstCaps * caps, guint * size);
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static GstFlowReturn gst_smpte_alpha_transform (GstBaseTransform * trans,
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GstBuffer * in, GstBuffer * out);
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static GstElementClass *parent_class = NULL;
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/*static guint gst_smpte_alpha_signals[LAST_SIGNAL] = { 0 }; */
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static GType
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gst_smpte_alpha_get_type (void)
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{
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static GType smpte_type = 0;
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if (!smpte_type) {
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static const GTypeInfo smpte_info = {
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sizeof (GstSMPTEAlphaClass),
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(GBaseInitFunc) gst_smpte_alpha_base_init,
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NULL,
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(GClassInitFunc) gst_smpte_alpha_class_init,
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NULL,
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NULL,
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sizeof (GstSMPTEAlpha),
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0,
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(GInstanceInitFunc) gst_smpte_alpha_init,
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};
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smpte_type =
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g_type_register_static (GST_TYPE_VIDEO_FILTER, "GstSMPTEAlpha",
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&smpte_info, 0);
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}
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return smpte_type;
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}
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static void
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gst_smpte_alpha_base_init (GstSMPTEAlphaClass * klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_smpte_alpha_sink_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_smpte_alpha_src_template));
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gst_element_class_set_details (element_class, &smpte_details);
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}
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static void
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gst_smpte_alpha_class_init (GstSMPTEAlphaClass * 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 = (GObjectClass *) klass;
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trans_class = (GstBaseTransformClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->set_property = gst_smpte_alpha_set_property;
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gobject_class->get_property = gst_smpte_alpha_get_property;
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gobject_class->finalize = (GObjectFinalizeFunc) gst_smpte_alpha_finalize;
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_gst_mask_init ();
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TYPE,
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g_param_spec_enum ("type", "Type", "The type of transition to use",
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GST_TYPE_SMPTE_TRANSITION_TYPE, DEFAULT_PROP_TYPE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BORDER,
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g_param_spec_int ("border", "Border",
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"The border width of the transition", 0, G_MAXINT,
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DEFAULT_PROP_BORDER, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DEPTH,
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g_param_spec_int ("depth", "Depth", "Depth of the mask in bits", 1, 24,
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DEFAULT_PROP_DEPTH, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_POSITION,
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g_param_spec_double ("position", "Position",
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"Position of the transition effect", 0.0, 1.0, DEFAULT_PROP_POSITION,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_smpte_alpha_setcaps);
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trans_class->get_unit_size =
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GST_DEBUG_FUNCPTR (gst_smpte_alpha_get_unit_size);
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trans_class->transform = GST_DEBUG_FUNCPTR (gst_smpte_alpha_transform);
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}
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static gboolean
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gst_smpte_alpha_update_mask (GstSMPTEAlpha * smpte, gint type, gint depth,
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gint width, gint height)
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{
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GstMask *newmask;
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/* try to avoid regenerating the mask if we already have one that is
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* correct */
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if (smpte->mask) {
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if (smpte->type == type &&
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smpte->depth == depth &&
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smpte->width == width && smpte->height == height)
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return TRUE;
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}
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newmask = gst_mask_factory_new (type, depth, width, height);
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if (!newmask)
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goto mask_failed;
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if (smpte->mask)
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gst_mask_destroy (smpte->mask);
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smpte->mask = newmask;
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smpte->type = type;
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smpte->depth = depth;
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smpte->width = width;
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smpte->height = height;
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return TRUE;
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/* ERRORS */
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mask_failed:
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{
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GST_ERROR_OBJECT (smpte, "failed to create a mask");
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return FALSE;
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}
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}
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static gboolean
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gst_smpte_alpha_setcaps (GstBaseTransform * btrans, GstCaps * incaps,
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GstCaps * outcaps)
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{
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GstSMPTEAlpha *smpte;
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GstStructure *structure;
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gboolean ret;
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gint width, height;
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guint32 fourcc;
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smpte = GST_SMPTE_ALPHA (btrans);
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structure = gst_caps_get_structure (incaps, 0);
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/* see if we can get essential info */
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ret = gst_structure_get_int (structure, "width", &width);
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ret &= gst_structure_get_int (structure, "height", &height);
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ret &= gst_structure_get_fourcc (structure, "format", &fourcc);
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if (!ret)
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goto no_dimensions;
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/* try to update the mask now, this will also adjust the width/height on
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* success */
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GST_OBJECT_LOCK (smpte);
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ret = gst_smpte_alpha_update_mask (smpte, smpte->type, smpte->depth,
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width, height);
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GST_OBJECT_UNLOCK (smpte);
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if (!ret)
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goto mask_failed;
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switch (fourcc) {
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case GST_MAKE_FOURCC ('A', 'Y', 'U', 'V'):
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smpte->format = GST_VIDEO_FORMAT_AYUV;
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break;
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case GST_MAKE_FOURCC ('I', '4', '2', '0'):
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smpte->format = GST_VIDEO_FORMAT_I420;
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break;
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default:
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goto unsupported_fourcc;
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}
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return ret;
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/* ERRORS */
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no_dimensions:
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{
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GST_ERROR_OBJECT (smpte, "no width, height and fourcc given");
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return FALSE;
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}
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mask_failed:
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{
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GST_ERROR_OBJECT (smpte, "failed creating the mask");
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return FALSE;
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}
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unsupported_fourcc:
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{
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GST_ERROR_OBJECT (smpte, "unsupported fourcc %" GST_FOURCC_FORMAT,
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GST_FOURCC_ARGS (fourcc));
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return FALSE;
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}
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}
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static gboolean
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gst_smpte_alpha_get_unit_size (GstBaseTransform * btrans, GstCaps * caps,
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guint * size)
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{
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GstStructure *structure;
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gboolean ret;
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gint width, height;
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guint32 fourcc;
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structure = gst_caps_get_structure (caps, 0);
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ret = gst_structure_get_int (structure, "width", &width);
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ret &= gst_structure_get_int (structure, "height", &height);
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ret &= gst_structure_get_fourcc (structure, "format", &fourcc);
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if (ret) {
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switch (fourcc) {
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case GST_MAKE_FOURCC ('A', 'Y', 'U', 'V'):
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*size =
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gst_video_format_get_size (GST_VIDEO_FORMAT_AYUV, width, height);
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break;
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case GST_MAKE_FOURCC ('I', '4', '2', '0'):
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*size =
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gst_video_format_get_size (GST_VIDEO_FORMAT_I420, width, height);
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break;
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default:
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ret = FALSE;
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break;
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}
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}
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return ret;
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}
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static void
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gst_smpte_alpha_init (GstSMPTEAlpha * smpte)
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{
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smpte->type = DEFAULT_PROP_TYPE;
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smpte->border = DEFAULT_PROP_BORDER;
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smpte->depth = DEFAULT_PROP_DEPTH;
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}
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static void
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gst_smpte_alpha_finalize (GstSMPTEAlpha * smpte)
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{
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if (smpte->mask)
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gst_mask_destroy (smpte->mask);
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G_OBJECT_CLASS (parent_class)->finalize ((GObject *) smpte);
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}
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static void
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gst_smpte_alpha_do_ayuv (GstSMPTEAlpha * smpte, guint8 * in, guint8 * out,
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GstMask * mask, gint width, gint height, gint border, gint pos)
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{
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gint i, j;
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guint32 *maskp;
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gint value;
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gint min, max;
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if (border == 0)
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border++;
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min = pos - border;
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max = pos;
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GST_DEBUG_OBJECT (smpte, "pos %d, min %d, max %d, border %d", pos, min, max,
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border);
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maskp = mask->data;
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/* we basically copy the source to dest but we scale the alpha channel with
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* the mask */
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for (i = 0; i < height; i++) {
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for (j = 0; j < width; j++) {
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value = *maskp++;
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*out++ = (*in++ * ((CLAMP (value, min, max) - min) << 8) / border) >> 8;
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*out++ = *in++;
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*out++ = *in++;
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*out++ = *in++;
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}
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}
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}
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static void
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gst_smpte_alpha_do_i420 (GstSMPTEAlpha * smpte, guint8 * in, guint8 * out,
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GstMask * mask, gint width, gint height, gint border, gint pos)
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{
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guint8 *srcY;
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guint8 *srcU;
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guint8 *srcV;
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gint i, j;
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gint src_wrap, src_uv_wrap;
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gint y_stride, uv_stride;
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gboolean odd_width;
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guint32 *maskp;
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gint value;
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gint min, max;
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if (border == 0)
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border++;
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min = pos - border;
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max = pos;
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GST_DEBUG_OBJECT (smpte, "pos %d, min %d, max %d, border %d", pos, min, max,
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border);
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maskp = mask->data;
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y_stride = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 0, width);
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uv_stride = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 1, width);
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src_wrap = y_stride - width;
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src_uv_wrap = uv_stride - (width / 2);
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srcY = in;
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srcU = in + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420,
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1, width, height);
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srcV = in + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420,
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2, width, height);
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odd_width = (width % 2 != 0);
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for (i = 0; i < height; i++) {
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for (j = 0; j < width / 2; j++) {
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value = *maskp++;
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*out++ = (0xff * ((CLAMP (value, min, max) - min) << 8) / border) >> 8;
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*out++ = *srcY++;
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*out++ = *srcU;
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*out++ = *srcV;
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value = *maskp++;
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*out++ = (0xff * ((CLAMP (value, min, max) - min) << 8) / border) >> 8;
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*out++ = *srcY++;
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*out++ = *srcU++;
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*out++ = *srcV++;
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}
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/* Might have one odd column left to do */
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if (odd_width) {
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value = *maskp++;
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*out++ = (0xff * ((CLAMP (value, min, max) - min) << 8) / border) >> 8;
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*out++ = *srcY++;
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*out++ = *srcU;
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*out++ = *srcV;
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}
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if (i % 2 == 0) {
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srcU -= width / 2;
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srcV -= width / 2;
|
|
} else {
|
|
srcU += src_uv_wrap;
|
|
srcV += src_uv_wrap;
|
|
}
|
|
srcY += src_wrap;
|
|
}
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_smpte_alpha_transform (GstBaseTransform * trans, GstBuffer * in,
|
|
GstBuffer * out)
|
|
{
|
|
GstSMPTEAlpha *smpte;
|
|
GstClockTime timestamp, stream_time;
|
|
gdouble position;
|
|
gint border;
|
|
|
|
smpte = GST_SMPTE_ALPHA (trans);
|
|
|
|
/* first sync the controller to the current stream_time of the buffer */
|
|
timestamp = GST_BUFFER_TIMESTAMP (in);
|
|
stream_time =
|
|
gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME, timestamp);
|
|
|
|
GST_DEBUG_OBJECT (smpte, "sync to %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (timestamp));
|
|
|
|
if (GST_CLOCK_TIME_IS_VALID (stream_time))
|
|
gst_object_sync_values (G_OBJECT (smpte), stream_time);
|
|
|
|
/* these are the propertis we update with only the object lock, others are
|
|
* only updated with the TRANSFORM_LOCK. */
|
|
GST_OBJECT_LOCK (smpte);
|
|
position = smpte->position;
|
|
border = smpte->border;
|
|
GST_OBJECT_UNLOCK (smpte);
|
|
|
|
/* run the type specific filter code */
|
|
switch (smpte->format) {
|
|
case GST_VIDEO_FORMAT_I420:
|
|
gst_smpte_alpha_do_i420 (smpte, GST_BUFFER_DATA (in),
|
|
GST_BUFFER_DATA (out),
|
|
smpte->mask, smpte->width, smpte->height,
|
|
border, ((1 << smpte->depth) + border) * position);
|
|
break;
|
|
case GST_VIDEO_FORMAT_AYUV:
|
|
gst_smpte_alpha_do_ayuv (smpte, GST_BUFFER_DATA (in),
|
|
GST_BUFFER_DATA (out),
|
|
smpte->mask, smpte->width, smpte->height,
|
|
border, ((1 << smpte->depth) + border) * position);
|
|
break;
|
|
default:
|
|
goto not_negotiated;
|
|
}
|
|
|
|
return GST_FLOW_OK;
|
|
|
|
/* ERRORS */
|
|
not_negotiated:
|
|
{
|
|
GST_ELEMENT_ERROR (smpte, CORE, NEGOTIATION, (NULL),
|
|
("No input format negotiated"));
|
|
return GST_FLOW_NOT_NEGOTIATED;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_smpte_alpha_set_property (GObject * object, guint prop_id,
|
|
const GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstSMPTEAlpha *smpte;
|
|
|
|
smpte = GST_SMPTE_ALPHA (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_TYPE:
|
|
GST_BASE_TRANSFORM_LOCK (smpte);
|
|
/* also lock with the object lock so that reading the property doesn't
|
|
* have to wait for the transform lock */
|
|
GST_OBJECT_LOCK (smpte);
|
|
smpte->type = g_value_get_enum (value);
|
|
GST_OBJECT_UNLOCK (smpte);
|
|
gst_smpte_alpha_update_mask (smpte, smpte->type, smpte->depth,
|
|
smpte->width, smpte->height);
|
|
GST_BASE_TRANSFORM_UNLOCK (smpte);
|
|
break;
|
|
case PROP_BORDER:
|
|
GST_OBJECT_LOCK (smpte);
|
|
smpte->border = g_value_get_int (value);
|
|
GST_OBJECT_UNLOCK (smpte);
|
|
break;
|
|
case PROP_DEPTH:
|
|
GST_BASE_TRANSFORM_LOCK (smpte);
|
|
/* also lock with the object lock so that reading the property doesn't
|
|
* have to wait for the transform lock */
|
|
GST_OBJECT_LOCK (smpte);
|
|
smpte->depth = g_value_get_int (value);
|
|
GST_OBJECT_UNLOCK (smpte);
|
|
gst_smpte_alpha_update_mask (smpte, smpte->type, smpte->depth,
|
|
smpte->width, smpte->height);
|
|
GST_BASE_TRANSFORM_UNLOCK (smpte);
|
|
break;
|
|
case PROP_POSITION:
|
|
GST_OBJECT_LOCK (smpte);
|
|
smpte->position = g_value_get_double (value);
|
|
GST_OBJECT_UNLOCK (smpte);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_smpte_alpha_get_property (GObject * object, guint prop_id,
|
|
GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstSMPTEAlpha *smpte;
|
|
|
|
smpte = GST_SMPTE_ALPHA (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_TYPE:
|
|
GST_OBJECT_LOCK (smpte);
|
|
g_value_set_enum (value, smpte->type);
|
|
GST_OBJECT_UNLOCK (smpte);
|
|
break;
|
|
case PROP_BORDER:
|
|
GST_OBJECT_LOCK (smpte);
|
|
g_value_set_int (value, smpte->border);
|
|
GST_OBJECT_UNLOCK (smpte);
|
|
break;
|
|
case PROP_DEPTH:
|
|
GST_OBJECT_LOCK (smpte);
|
|
g_value_set_int (value, smpte->depth);
|
|
GST_OBJECT_UNLOCK (smpte);
|
|
break;
|
|
case PROP_POSITION:
|
|
GST_OBJECT_LOCK (smpte);
|
|
g_value_set_double (value, smpte->position);
|
|
GST_OBJECT_UNLOCK (smpte);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
gboolean
|
|
gst_smpte_alpha_plugin_init (GstPlugin * plugin)
|
|
{
|
|
GST_DEBUG_CATEGORY_INIT (gst_smpte_alpha_debug, "smptealpha", 0,
|
|
"SMPTE alpha effect");
|
|
|
|
/* initialize gst controller library */
|
|
gst_controller_init (NULL, NULL);
|
|
|
|
return gst_element_register (plugin, "smptealpha", GST_RANK_NONE,
|
|
GST_TYPE_SMPTE_ALPHA);
|
|
}
|