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gstreamer/gst/videomixer/videomixer.c
Wim Taymans 658b2d7f85 gst/videomixer/videomixer.c: Copy timestamps from the master pad to the output buffers. 
Original commit message from CVS:
* gst/videomixer/videomixer.c: (gst_videomixer_blend_buffers):
Copy timestamps from the master pad to the output buffers.
2004-09-07 13:40:52 +00:00

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/* Generic video mixer plugin
* Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (gst_videomixer_debug);
#define GST_CAT_DEFAULT gst_videomixer_debug
#define GST_TYPE_VIDEO_MIXER_PAD (gst_videomixer_pad_get_type())
#define GST_VIDEO_MIXER_PAD(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIDEO_MIXER_PAD, GstVideoMixerPad))
#define GST_VIDEO_MIXER_PAD_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIDEO_MIXER_PAD, GstVideoMixerPadiClass))
#define GST_IS_VIDEO_MIXER_PAD(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_MIXER_PAD))
#define GST_IS_VIDEO_MIXER_PAD_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_MIXER_PAD))
typedef struct _GstVideoMixerPad GstVideoMixerPad;
typedef struct _GstVideoMixerPadClass GstVideoMixerPadClass;
#define GST_TYPE_VIDEO_MIXER (gst_videomixer_get_type())
#define GST_VIDEO_MIXER(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIDEO_MIXER, GstVideoMixer))
#define GST_VIDEO_MIXER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIDEO_MIXER, GstVideoMixerClass))
#define GST_IS_VIDEO_MIXER(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_MIXER))
#define GST_IS_VIDEO_MIXER_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_MIXER))
static GType gst_videomixer_get_type (void);
typedef struct _GstVideoMixer GstVideoMixer;
typedef struct _GstVideoMixerClass GstVideoMixerClass;
static void gst_videomixer_pad_base_init (gpointer g_class);
static void gst_videomixer_pad_class_init (GstVideoMixerPadClass * klass);
static void gst_videomixer_pad_init (GstVideoMixerPad * mixerpad);
static void gst_videomixer_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_videomixer_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_videomixer_sort_pads (GstVideoMixer * mix);
#define DEFAULT_PAD_ZORDER 0
#define DEFAULT_PAD_XPOS 0
#define DEFAULT_PAD_YPOS 0
#define DEFAULT_PAD_ALPHA 1.0
enum
{
ARG_PAD_0,
ARG_PAD_ZORDER,
ARG_PAD_XPOS,
ARG_PAD_YPOS,
ARG_PAD_ALPHA,
};
/* all information needed for one video stream */
struct _GstVideoMixerPad
{
GstRealPad parent; /* subclass the pad */
GstBuffer *buffer; /* the queued buffer for this pad */
gboolean eos;
gint64 queued;
guint in_width, in_height;
gdouble in_framerate;
gint xpos, ypos;
guint zorder;
gint blend_mode;
gdouble alpha;
};
struct _GstVideoMixerPadClass
{
GstRealPadClass parent_class;
};
static GType
gst_videomixer_pad_get_type (void)
{
static GType videomixer_pad_type = 0;
if (!videomixer_pad_type) {
static const GTypeInfo videomixer_pad_info = {
sizeof (GstVideoMixerPadClass),
gst_videomixer_pad_base_init,
NULL,
(GClassInitFunc) gst_videomixer_pad_class_init,
NULL,
NULL,
sizeof (GstVideoMixerPad),
0,
(GInstanceInitFunc) gst_videomixer_pad_init,
};
videomixer_pad_type =
g_type_register_static (GST_TYPE_REAL_PAD,
"GstVideoMixerPad", &videomixer_pad_info, 0);
}
return videomixer_pad_type;
}
static void
gst_videomixer_pad_base_init (gpointer g_class)
{
}
static void
gst_videomixer_pad_class_init (GstVideoMixerPadClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) klass;
gobject_class->set_property =
GST_DEBUG_FUNCPTR (gst_videomixer_pad_set_property);
gobject_class->get_property =
GST_DEBUG_FUNCPTR (gst_videomixer_pad_get_property);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PAD_ZORDER,
g_param_spec_uint ("zorder", "Z-Order", "Z Order of the picture",
0, 10000, DEFAULT_PAD_ZORDER, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PAD_XPOS,
g_param_spec_int ("xpos", "X Position", "X Position of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_XPOS, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PAD_YPOS,
g_param_spec_int ("ypos", "Y Position", "Y Position of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_YPOS, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PAD_ALPHA,
g_param_spec_double ("alpha", "Alpha", "Alpha of the picture",
0.0, 1.0, DEFAULT_PAD_ALPHA, G_PARAM_READWRITE));
}
static const GstEventMask *
gst_videomixer_pad_get_sink_event_masks (GstPad * pad)
{
static const GstEventMask gst_videomixer_sink_event_masks[] = {
{GST_EVENT_EOS, 0},
{0,}
};
return gst_videomixer_sink_event_masks;
}
static void
gst_videomixer_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstVideoMixerPad *pad;
g_return_if_fail (GST_IS_VIDEO_MIXER_PAD (object));
pad = GST_VIDEO_MIXER_PAD (object);
switch (prop_id) {
case ARG_PAD_ZORDER:
g_value_set_uint (value, pad->zorder);
break;
case ARG_PAD_XPOS:
g_value_set_int (value, pad->xpos);
break;
case ARG_PAD_YPOS:
g_value_set_int (value, pad->ypos);
break;
case ARG_PAD_ALPHA:
g_value_set_double (value, pad->alpha);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_videomixer_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstVideoMixerPad *pad;
GstVideoMixer *mix;
g_return_if_fail (GST_IS_PAD (object));
pad = GST_VIDEO_MIXER_PAD (object);
mix = GST_VIDEO_MIXER (gst_pad_get_parent (GST_PAD (pad)));
switch (prop_id) {
case ARG_PAD_ZORDER:
pad->zorder = g_value_get_uint (value);
gst_videomixer_sort_pads (mix);
break;
case ARG_PAD_XPOS:
pad->xpos = g_value_get_int (value);
break;
case ARG_PAD_YPOS:
pad->ypos = g_value_get_int (value);
break;
case ARG_PAD_ALPHA:
pad->alpha = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
typedef enum
{
VIDEO_MIXER_BACKGROUND_CHECKER,
VIDEO_MIXER_BACKGROUND_BLACK,
VIDEO_MIXER_BACKGROUND_WHITE,
}
GstVideoMixerBackground;
struct _GstVideoMixer
{
GstElement element;
/* pad */
GstPad *srcpad;
/* sinkpads, a GSList of GstVideoMixerPads */
GSList *sinkpads;
gint numpads;
/* the master pad */
GstVideoMixerPad *master;
gint in_width, in_height;
gint out_width, out_height;
GstVideoMixerBackground background;
gdouble in_framerate;
};
struct _GstVideoMixerClass
{
GstElementClass parent_class;
};
static GstPadLinkReturn
gst_videomixer_pad_sinkconnect (GstPad * pad, const GstCaps * vscaps)
{
GstVideoMixer *mix;
GstVideoMixerPad *mixpad;
GstStructure *structure;
mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad));
mixpad = GST_VIDEO_MIXER_PAD (pad);
GST_DEBUG ("videomixer: sinkconnect triggered on %s", gst_pad_get_name (pad));
structure = gst_caps_get_structure (vscaps, 0);
gst_structure_get_int (structure, "width", &mixpad->in_width);
gst_structure_get_int (structure, "height", &mixpad->in_height);
gst_structure_get_double (structure, "framerate", &mixpad->in_framerate);
mixpad->xpos = 0;
mixpad->ypos = 0;
mix->in_width = MAX (mix->in_width, mixpad->in_width);
mix->in_height = MAX (mix->in_height, mixpad->in_height);
if (mix->in_framerate < mixpad->in_framerate) {
mix->in_framerate = mixpad->in_framerate;
mix->master = mixpad;
}
return GST_PAD_LINK_OK;
}
static void
gst_videomixer_pad_link (GstPad * pad, GstPad * peer, gpointer data)
{
//GstVideoMixer *videomixer = GST_VIDEO_MIXER (data);
GST_DEBUG ("pad '%s' connected", gst_pad_get_name (pad));
}
static void
gst_videomixer_pad_unlink (GstPad * pad, GstPad * peer, gpointer data)
{
//GstVideoMixer *videomixer = GST_VIDEO_MIXER (data);
GST_DEBUG ("pad '%s' unlinked", gst_pad_get_name (pad));
}
static void
gst_videomixer_pad_init (GstVideoMixerPad * mixerpad)
{
g_signal_connect (mixerpad, "linked",
G_CALLBACK (gst_videomixer_pad_link), (gpointer) mixerpad);
g_signal_connect (mixerpad, "unlinked",
G_CALLBACK (gst_videomixer_pad_unlink), (gpointer) mixerpad);
/* setup some pad functions */
gst_pad_set_link_function (GST_PAD (mixerpad),
gst_videomixer_pad_sinkconnect);
gst_pad_set_event_mask_function (GST_PAD (mixerpad),
gst_videomixer_pad_get_sink_event_masks);
mixerpad->zorder = DEFAULT_PAD_ZORDER;
mixerpad->xpos = DEFAULT_PAD_XPOS;
mixerpad->ypos = DEFAULT_PAD_YPOS;
mixerpad->alpha = DEFAULT_PAD_ALPHA;
}
/* elementfactory information */
static GstElementDetails gst_videomixer_details =
GST_ELEMENT_DETAILS ("video mixer",
"Filter/Editor/Video",
"Mix multiple video streams",
"Wim Taymans <wim@fluendo.com>");
/* VideoMixer signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
#define DEFAULT_BACKGROUND VIDEO_MIXER_BACKGROUND_CHECKER
enum
{
ARG_0,
ARG_BACKGROUND,
};
#define GST_TYPE_VIDEO_MIXER_BACKGROUND (gst_video_mixer_background_get_type())
static GType
gst_video_mixer_background_get_type (void)
{
static GType video_mixer_background_type = 0;
static GEnumValue video_mixer_background[] = {
{VIDEO_MIXER_BACKGROUND_CHECKER, "0", "Checker pattern"},
{VIDEO_MIXER_BACKGROUND_BLACK, "1", "Black"},
{VIDEO_MIXER_BACKGROUND_WHITE, "2", "White"},
{0, NULL, NULL},
};
if (!video_mixer_background_type) {
video_mixer_background_type =
g_enum_register_static ("GstVideoMixerBackground",
video_mixer_background);
}
return video_mixer_background_type;
}
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-yuv,"
"format = (fourcc) I420,"
"width = (int) [ 16, 4096 ],"
"height = (int) [ 16, 4096 ]," "framerate = (double) [ 0, max ]")
);
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("video/x-raw-yuv,"
"format = (fourcc) AYUV,"
"width = (int) [ 16, 4096 ],"
"height = (int) [ 16, 4096 ]," "framerate = (double) [ 0, max ]")
);
static void gst_videomixer_base_init (gpointer g_class);
static void gst_videomixer_class_init (GstVideoMixerClass * klass);
static void gst_videomixer_init (GstVideoMixer * videomixer);
static GstCaps *gst_videomixer_getcaps (GstPad * pad);
static void gst_videomixer_loop (GstElement * element);
static gboolean gst_videomixer_handle_src_event (GstPad * pad,
GstEvent * event);
static GstPad *gst_videomixer_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name);
static void gst_videomixer_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_videomixer_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstElementStateReturn gst_videomixer_change_state (GstElement * element);
static GstElementClass *parent_class = NULL;
/*static guint gst_videomixer_signals[LAST_SIGNAL] = { 0 }; */
static GType
gst_videomixer_get_type (void)
{
static GType videomixer_type = 0;
if (!videomixer_type) {
static const GTypeInfo videomixer_info = {
sizeof (GstVideoMixerClass),
gst_videomixer_base_init,
NULL,
(GClassInitFunc) gst_videomixer_class_init,
NULL,
NULL,
sizeof (GstVideoMixer),
0,
(GInstanceInitFunc) gst_videomixer_init,
};
videomixer_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstVideoMixer",
&videomixer_info, 0);
}
return videomixer_type;
}
static void
gst_videomixer_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory));
gst_element_class_set_details (element_class, &gst_videomixer_details);
}
static void
gst_videomixer_class_init (GstVideoMixerClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BACKGROUND,
g_param_spec_enum ("background", "Background", "Background type",
GST_TYPE_VIDEO_MIXER_BACKGROUND,
DEFAULT_BACKGROUND, G_PARAM_READWRITE));
gstelement_class->request_new_pad = gst_videomixer_request_new_pad;
gstelement_class->change_state = gst_videomixer_change_state;
gstelement_class->get_property = gst_videomixer_get_property;
gstelement_class->set_property = gst_videomixer_set_property;
}
static void
gst_videomixer_init (GstVideoMixer * mix)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (mix);
mix->srcpad =
gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
"src"), "src");
gst_pad_set_getcaps_function (GST_PAD (mix->srcpad), gst_videomixer_getcaps);
gst_pad_set_event_function (mix->srcpad, gst_videomixer_handle_src_event);
gst_element_add_pad (GST_ELEMENT (mix), mix->srcpad);
GST_FLAG_SET (GST_ELEMENT (mix), GST_ELEMENT_EVENT_AWARE);
mix->sinkpads = NULL;
mix->background = DEFAULT_BACKGROUND;
mix->in_width = 0;
mix->in_height = 0;
mix->out_width = 0;
mix->out_height = 0;
gst_element_set_loop_function (GST_ELEMENT (mix), gst_videomixer_loop);
}
static GstCaps *
gst_videomixer_getcaps (GstPad * pad)
{
GstVideoMixer *mix;
GstCaps *caps;
GstPadTemplate *src_pad_template;
GstStructure *structure;
mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad));
src_pad_template = gst_static_pad_template_get (&src_factory);
caps = gst_caps_copy (gst_pad_template_get_caps (src_pad_template));
structure = gst_caps_get_structure (caps, 0);
if (mix->out_width != 0) {
gst_structure_set (structure, "width", G_TYPE_INT, mix->out_width, NULL);
}
if (mix->out_height != 0) {
gst_structure_set (structure, "height", G_TYPE_INT, mix->out_height, NULL);
}
if (mix->in_framerate != 0) {
gst_structure_set (structure,
"framerate", G_TYPE_DOUBLE, mix->in_framerate, NULL);
}
return caps;
}
static GstPad *
gst_videomixer_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * req_name)
{
GstVideoMixer *mix;
GstPad *newpad;
GstElementClass *klass = GST_ELEMENT_GET_CLASS (element);
g_return_val_if_fail (templ != NULL, NULL);
if (templ->direction != GST_PAD_SINK) {
g_warning ("videomixer: request pad that is not a SINK pad\n");
return NULL;
}
g_return_val_if_fail (GST_IS_VIDEO_MIXER (element), NULL);
mix = GST_VIDEO_MIXER (element);
if (templ == gst_element_class_get_pad_template (klass, "sink_%d")) {
gchar *name;
GstVideoMixerPad *mixpad;
/* create new pad with the name */
name = g_strdup_printf ("sink_%02d", mix->numpads);
newpad =
gst_pad_custom_new_from_template (GST_TYPE_VIDEO_MIXER_PAD, templ,
name);
g_free (name);
mixpad = GST_VIDEO_MIXER_PAD (newpad);
mixpad->zorder = mix->numpads;
mix->numpads++;
mix->sinkpads = g_slist_append (mix->sinkpads, newpad);
} else {
g_warning ("videomixer: this is not our template!\n");
return NULL;
}
/* dd the pad to the element */
gst_element_add_pad (element, newpad);
return newpad;
}
/* handle events */
static gboolean
gst_videomixer_handle_src_event (GstPad * pad, GstEvent * event)
{
GstVideoMixer *mix;
GstEventType type;
mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad));
type = event ? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
switch (type) {
case GST_EVENT_SEEK:
/* disable seeking for now */
return FALSE;
default:
break;
}
return gst_pad_event_default (pad, event);
}
#define BLEND_NORMAL(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \
U = ((U1*(255-alpha))+(U2*alpha))>>8; \
V = ((V1*(255-alpha))+(V2*alpha))>>8;
#define BLEND_ADD(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = Y1+((Y2*alpha)>>8); \
U = U1+(((127*(255-alpha)+(U2*alpha)))>>8)-127; \
V = V1+(((127*(255-alpha)+(V2*alpha)))>>8)-127; \
if (Y>255) { \
gint mult = MAX (0, 288-Y); \
U = ((U*mult) + (127*(32-mult)))>>5; \
V = ((V*mult) + (127*(32-mult)))>>5; \
Y = 255; \
} \
U = MIN (U,255); \
V = MIN (V,255);
#define BLEND_SUBTRACT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = Y1-((Y2*alpha)>>8); \
U = U1+(((127*(255-alpha)+(U2*alpha)))>>8)-127; \
V = V1+(((127*(255-alpha)+(V2*alpha)))>>8)-127; \
if (Y<0) { \
gint mult = MIN (32, -Y); \
U = ((U*(32-mult)) + (127*mult))>>5; \
V = ((V*(32-mult)) + (127*mult))>>5; \
Y = 0; \
}
#define BLEND_DARKEN(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
if (Y1 < Y2) { \
Y = Y1; U = U1; V = V1; \
} \
else { \
Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \
U = ((U1*(255-alpha))+(U2*alpha))>>8; \
V = ((V1*(255-alpha))+(V2*alpha))>>8; \
}
#define BLEND_LIGHTEN(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
if (Y1 > Y2) { \
Y = Y1; U = U1; V = V1; \
} \
else { \
Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \
U = ((U1*(255-alpha))+(U2*alpha))>>8; \
V = ((V1*(255-alpha))+(V2*alpha))>>8; \
}
#define BLEND_MULTIPLY(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = (Y1*(256*(255-alpha) +(Y2*alpha)))>>16; \
U = ((U1*(255-alpha)*256)+(alpha*(U1*Y2+128*(256-Y2))))>>16; \
V = ((V1*(255-alpha)*256)+(alpha*(V1*Y2+128*(256-Y2))))>>16;
#define BLEND_DIFFERENCE(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = ABS((gint)Y1-(gint)Y2)+127; \
U = ABS((gint)U1-(gint)U2)+127; \
V = ABS((gint)V1-(gint)V2)+127; \
Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
U = ((U*alpha)+(U1*(255-alpha)))>>8; \
V = ((V*alpha)+(V1*(255-alpha)))>>8; \
if (Y>255) { \
gint mult = MAX (0, 288-Y); \
U = ((U*mult) + (127*(32-mult)))>>5; \
V = ((V*mult) + (127*(32-mult)))>>5; \
Y = 255; \
} else if (Y<0) { \
gint mult = MIN (32, -Y); \
U = ((U*(32-mult)) + (127*mult))>>5; \
V = ((V*(32-mult)) + (127*mult))>>5; \
Y = 0; \
} \
U = CLAMP(U, 0, 255); \
V = CLAMP(V, 0, 255);
#define BLEND_EXCLUSION(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = ((gint)(Y1^0xff)*Y2+(gint)(Y2^0xff)*Y1)>>8; \
U = ((gint)(U1^0xff)*Y2+(gint)(Y2^0xff)*U1)>>8; \
V = ((gint)(V1^0xff)*Y2+(gint)(Y2^0xff)*V1)>>8; \
Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
U = ((U*alpha)+(U1*(255-alpha)))>>8; \
V = ((V*alpha)+(V1*(255-alpha)))>>8; \
if (Y>255) { \
gint mult = MAX (0, 288-Y); \
U = ((U*mult) + (127*(32-mult)))>>5; \
V = ((V*mult) + (127*(32-mult)))>>5; \
Y = 255; \
} else if (Y<0) { \
gint mult = MIN (32, -Y); \
U = ((U*(32-mult)) + (127*mult))>>5; \
V = ((V*(32-mult)) + (127*mult))>>5; \
Y = 0; \
} \
U = CLAMP(U, 0, 255); \
V = CLAMP(V, 0, 255);
#define BLEND_SOFTLIGHT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = (gint)Y1+(gint)Y2 - 127; \
U = (gint)U1+(gint)U2 - 127; \
V = (gint)V1+(gint)V2 - 127; \
Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
U = ((U*alpha)+(U1*(255-alpha)))>>8; \
V = ((V*alpha)+(V1*(255-alpha)))>>8; \
if (Y>255) { \
gint mult = MAX (0, 288-Y); \
U = ((U*mult) + (127*(32-mult)))>>5; \
V = ((V*mult) + (127*(32-mult)))>>5; \
Y = 255; \
} else if (Y<0) { \
gint mult = MIN (32, -Y); \
U = ((U*(32-mult)) + (127*mult))>>5; \
V = ((V*(32-mult)) + (127*mult))>>5; \
Y = 0; \
} \
#define BLEND_HARDLIGHT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \
Y = (gint)Y1+(gint)Y2*2 - 255; \
U = (gint)U1+(gint)U2 - 127; \
V = (gint)V1+(gint)V2 - 127; \
Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \
U = ((U*alpha)+(U1*(255-alpha)))>>8; \
V = ((V*alpha)+(V1*(255-alpha)))>>8; \
if (Y>255) { \
gint mult = MAX (0, 288-Y); \
U = ((U*mult) + (127*(32-mult)))>>5; \
V = ((V*mult) + (127*(32-mult)))>>5; \
Y = 255; \
} else if (Y<0) { \
gint mult = MIN (32, -Y); \
U = ((U*(32-mult)) + (127*mult))>>5; \
V = ((V*(32-mult)) + (127*mult))>>5; \
Y = 0; \
} \
#define BLEND_MODE BLEND_NORMAL
#if 0
#define BLEND_MODE BLEND_NORMAL
#define BLEND_MODE BLEND_ADD
#define BLEND_MODE BLEND_SUBTRACT
#define BLEND_MODE BLEND_LIGHTEN
#define BLEND_MODE BLEND_DARKEN
#define BLEND_MODE BLEND_MULTIPLY
#define BLEND_MODE BLEND_DIFFERENCE
#define BLEND_MODE BLEND_EXCLUSION
#define BLEND_MODE BLEND_SOFTLIGHT
#define BLEND_MODE BLEND_HARDLIGHT
#endif
/* note that this function does packing conversion and blending at the
* same time */
static void
gst_videomixer_blend_ayuv_i420 (guint8 * src, gint xpos, gint ypos,
gint src_width, gint src_height, gdouble src_alpha,
guint8 * dest, gint dest_width, gint dest_height)
{
gint dest_size;
gint alpha, b_alpha;
guint8 *destY1, *destY2, *destU, *destV;
gint accumU;
gint accumV;
gint i, j;
gint src_stride;
gint src_add, destY_add, destC_add;
guint8 *src1, *src2;
gint Y, U, V;
src_stride = src_width * 4;
dest_size = dest_width * dest_height;
b_alpha = (gint) (src_alpha * 255);
/* adjust src pointers for negative sizes */
if (xpos < 0) {
src += -xpos * 4;
src_width -= -xpos;
xpos = 0;
}
if (ypos < 0) {
src += -ypos * src_stride;
src_height -= -ypos;
ypos = 0;
}
/* adjust width/height if the src is bigger than dest */
if (xpos + src_width > dest_width) {
src_width = dest_width - xpos;
}
if (ypos + src_height > dest_height) {
src_height = dest_height - ypos;
}
src_add = 2 * src_stride - (4 * src_width);
destY_add = 2 * dest_width - (src_width);
destC_add = dest_width / 2 - (src_width / 2);
destY1 = dest + xpos + (ypos * dest_width);
destY2 = destY1 + dest_width;
destU = dest + dest_size + xpos / 2 + (ypos / 2 * dest_width / 2);
destV = destU + dest_size / 4;
src1 = src;
src2 = src + src_stride;
/* we convert a square of 2x2 samples to generate 4 Luma and 2 chroma samples */
for (i = 0; i < src_height / 2; i++) {
for (j = 0; j < src_width / 2; j++) {
alpha = (src1[0] * b_alpha) >> 8;
BLEND_MODE (destY1[0], destU[0], destV[0], src1[1], src1[2], src1[3],
alpha, Y, U, V);
destY1[0] = Y;
accumU = U;
accumV = V;
alpha = (src1[4] * b_alpha) >> 8;
BLEND_MODE (destY1[1], destU[0], destV[0], src1[5], src1[6], src1[7],
alpha, Y, U, V);
destY1[1] = Y;
accumU += U;
accumV += V;
alpha = (src2[0] * b_alpha) >> 8;
BLEND_MODE (destY2[0], destU[0], destV[0], src2[1], src2[2], src2[3],
alpha, Y, U, V);
destY2[0] = Y;
accumU += U;
accumV += V;
alpha = (src2[4] * b_alpha) >> 8;
BLEND_MODE (destY2[1], destU[0], destV[0], src2[5], src2[6], src2[7],
alpha, Y, U, V);
destY2[1] = Y;
accumU += U;
accumV += V;
/* take the average of the 4 chroma samples to get the final value */
destU[0] = accumU / 4;
destV[0] = accumV / 4;
src1 += 8;
src2 += 8;
destY1 += 2;
destY2 += 2;
destU += 1;
destV += 1;
}
src1 += src_add;
src2 += src_add;
destY1 += destY_add;
destY2 += destY_add;
destU += destC_add;
destV += destC_add;
}
}
#undef BLEND_MODE
static int
pad_zorder_compare (const GstVideoMixerPad * pad1,
const GstVideoMixerPad * pad2)
{
return pad1->zorder - pad2->zorder;
}
static void
gst_videomixer_sort_pads (GstVideoMixer * mix)
{
mix->sinkpads = g_slist_sort (mix->sinkpads,
(GCompareFunc) pad_zorder_compare);
}
/* fill a buffer with a checkerboard pattern */
static void
gst_videomixer_fill_checker (guint8 * dest, gint width, gint height)
{
gint size = width * height;
gint i, j;
static int tab[] = { 80, 160, 80, 160 };
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
*dest++ = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)];
}
}
memset (dest, 128, size / 2);
}
static void
gst_videomixer_fill_color (guint8 * dest, gint width, gint height,
gint colY, gint colU, gint colV)
{
gint size = width * height;
memset (dest, colY, size);
memset (dest + size, colU, size / 4);
memset (dest + size + size / 4, colV, size / 4);
}
/* try to get a buffer on all pads. As long as the queued value is
* negative, we skip buffers */
static gboolean
gst_videomixer_fill_queues (GstVideoMixer * mix)
{
GSList *walk;
gboolean eos = TRUE;
/* loop over all pads and fill it with a buffer */
walk = mix->sinkpads;
while (walk) {
GstVideoMixerPad *pad = GST_VIDEO_MIXER_PAD (walk->data);
walk = g_slist_next (walk);
GST_DEBUG ("looking at pad %s", gst_pad_get_name (GST_PAD (pad)));
/* don't care about eos pads */
if (pad->eos) {
GST_DEBUG ("pad %s in eos, skipping", gst_pad_get_name (GST_PAD (pad)));
continue;
}
GST_DEBUG ("pad %s: buffer %p, queued %lld ",
gst_pad_get_name (GST_PAD (pad)), pad->buffer, pad->queued);
/* this pad is in need of a new buffer */
if (pad->buffer == NULL) {
GstData *data;
GstBuffer *buffer;
/* as long as not enough buffers have been queued */
while (pad->queued <= 0 && !pad->eos) {
data = gst_pad_pull (GST_PAD (pad));
if (GST_IS_EVENT (data)) {
GstEvent *event = GST_EVENT (data);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
GST_DEBUG ("videomixer: EOS on pad %s",
gst_pad_get_name (GST_PAD (pad)));
/* mark pad eos */
pad->eos = TRUE;
gst_event_unref (event);
break;
default:
gst_pad_event_default (GST_PAD (pad), GST_EVENT (data));
}
} else {
guint64 duration;
buffer = GST_BUFFER (data);
duration = GST_BUFFER_DURATION (buffer);
/* no duration on the buffer, use the framerate */
if (duration == -1) {
if (pad->in_framerate == 0.0) {
duration = G_MAXINT64;
} else {
duration = GST_SECOND / pad->in_framerate;
}
}
pad->queued += duration;
/* this buffer will need to be mixed */
if (pad->queued > 0) {
pad->buffer = buffer;
} else {
/* skip buffer, it's too old */
gst_buffer_unref (buffer);
}
}
GST_DEBUG ("pad %s: in loop, buffer %p, queued %lld ",
gst_pad_get_name (GST_PAD (pad)), pad->buffer, pad->queued);
}
}
if (pad->buffer != NULL) {
/* got a buffer somewhere so were not eos */
eos = FALSE;
}
}
return eos;
}
/* blend all buffers present on the pads */
static void
gst_videomixer_blend_buffers (GstVideoMixer * mix, GstBuffer * outbuf)
{
GSList *walk;
walk = mix->sinkpads;
while (walk) {
GstVideoMixerPad *pad = GST_VIDEO_MIXER_PAD (walk->data);
walk = g_slist_next (walk);
if (pad->buffer != NULL) {
gst_videomixer_blend_ayuv_i420 (GST_BUFFER_DATA (pad->buffer),
pad->xpos, pad->ypos,
pad->in_width, pad->in_height,
pad->alpha,
GST_BUFFER_DATA (outbuf), mix->out_width, mix->out_height);
if (pad == mix->master) {
GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (pad->buffer);
GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (pad->buffer);
}
}
}
}
/* remove buffers from the queue that were expired in the
* interval of the master, we also prepare the queued value
* in the pad so that we can skip and fill buffers later on */
static void
gst_videomixer_update_queues (GstVideoMixer * mix)
{
GSList *walk;
guint64 interval;
interval = mix->master->queued;
if (interval <= 0) {
if (mix->in_framerate == 0.0) {
interval = G_MAXINT64;
} else {
interval = GST_SECOND / mix->in_framerate;
}
}
walk = mix->sinkpads;
while (walk) {
GstVideoMixerPad *pad = GST_VIDEO_MIXER_PAD (walk->data);
walk = g_slist_next (walk);
if (pad->buffer != NULL) {
pad->queued -= interval;
GST_DEBUG ("queued now %s %lld", gst_pad_get_name (GST_PAD (pad)),
pad->queued);
if (pad->queued <= 0) {
gst_buffer_unref (pad->buffer);
pad->buffer = NULL;
}
}
}
}
/*
* The basic idea is to get a buffer on all pads and mix them together.
* Based on the framerate, buffers are removed from the queues to make room
* for a new buffer.
*/
static void
gst_videomixer_loop (GstElement * element)
{
GstVideoMixer *mix;
GstBuffer *outbuf;
gint outsize;
gint new_width, new_height;
gboolean eos;
mix = GST_VIDEO_MIXER (element);
eos = gst_videomixer_fill_queues (mix);
if (eos) {
gst_pad_push (mix->srcpad, GST_DATA (gst_event_new (GST_EVENT_EOS)));
gst_element_set_eos (GST_ELEMENT (mix));
return;
}
new_width = mix->in_width;
new_height = mix->in_height;
if (new_width != mix->out_width ||
new_height != mix->out_height || !GST_PAD_CAPS (mix->srcpad)) {
GstCaps *newcaps;
newcaps =
gst_caps_copy (gst_pad_get_negotiated_caps (GST_PAD (mix->master)));
gst_caps_set_simple (newcaps, "format", GST_TYPE_FOURCC,
GST_STR_FOURCC ("I420"), "width", G_TYPE_INT, new_width, "height",
G_TYPE_INT, new_height, NULL);
if (GST_PAD_LINK_FAILED (gst_pad_try_set_caps (mix->srcpad, newcaps))) {
GST_ELEMENT_ERROR (mix, CORE, NEGOTIATION, (NULL), (NULL));
return;
}
mix->out_width = new_width;
mix->out_height = new_height;
}
outsize = 3 * (mix->out_width * mix->out_height) / 2;
outbuf = gst_pad_alloc_buffer (mix->srcpad, GST_BUFFER_OFFSET_NONE, outsize);
switch (mix->background) {
case VIDEO_MIXER_BACKGROUND_CHECKER:
gst_videomixer_fill_checker (GST_BUFFER_DATA (outbuf),
new_width, new_height);
break;
case VIDEO_MIXER_BACKGROUND_BLACK:
gst_videomixer_fill_color (GST_BUFFER_DATA (outbuf),
new_width, new_height, 16, 128, 128);
break;
case VIDEO_MIXER_BACKGROUND_WHITE:
gst_videomixer_fill_color (GST_BUFFER_DATA (outbuf),
new_width, new_height, 240, 128, 128);
break;
}
gst_videomixer_blend_buffers (mix, outbuf);
gst_videomixer_update_queues (mix);
gst_pad_push (mix->srcpad, GST_DATA (outbuf));
}
static void
gst_videomixer_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstVideoMixer *mix = GST_VIDEO_MIXER (object);
switch (prop_id) {
case ARG_BACKGROUND:
g_value_set_enum (value, mix->background);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_videomixer_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstVideoMixer *mix = GST_VIDEO_MIXER (object);
switch (prop_id) {
case ARG_BACKGROUND:
mix->background = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstElementStateReturn
gst_videomixer_change_state (GstElement * element)
{
GstVideoMixer *mix;
gint transition = GST_STATE_TRANSITION (element);
g_return_val_if_fail (GST_IS_VIDEO_MIXER (element), GST_STATE_FAILURE);
mix = GST_VIDEO_MIXER (element);
switch (transition) {
case GST_STATE_NULL_TO_READY:
case GST_STATE_READY_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_PLAYING:
case GST_STATE_PLAYING_TO_PAUSED:
case GST_STATE_PAUSED_TO_READY:
case GST_STATE_READY_TO_NULL:
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_videomixer_debug, "videomixer", 0,
"video mixer");
return gst_element_register (plugin, "videomixer", GST_RANK_PRIMARY,
GST_TYPE_VIDEO_MIXER);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"videomixer",
"Video mixer", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)
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