gstreamer/gst/smpte/gstsmptealpha.c

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