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gstreamer/gst/compositor/compositor.c
Sebastian Dröge 233ee9f077 videoaggregator: Move needs_alpha pad field to the private struct 
And also trigger renegotiation if the value has changed.

https://bugzilla.gnome.org/show_bug.cgi?id=795836
2018-05-05 16:32:19 +02:00

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/* Video compositor plugin
* Copyright (C) 2004, 2008 Wim Taymans <wim@fluendo.com>
* Copyright (C) 2010 Sebastian Dröge <sebastian.droege@collabora.co.uk>
* Copyright (C) 2014 Mathieu Duponchelle <mathieu.duponchelle@opencreed.com>
* Copyright (C) 2014 Thibault Saunier <tsaunier@gnome.org>
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-compositor
* @title: compositor
*
* Compositor can accept AYUV, ARGB and BGRA video streams. For each of the requested
* sink pads it will compare the incoming geometry and framerate to define the
* output parameters. Indeed output video frames will have the geometry of the
* biggest incoming video stream and the framerate of the fastest incoming one.
*
* Compositor will do colorspace conversion.
*
* Individual parameters for each input stream can be configured on the
* #GstCompositorPad:
*
* * "xpos": The x-coordinate position of the top-left corner of the picture (#gint)
* * "ypos": The y-coordinate position of the top-left corner of the picture (#gint)
* * "width": The width of the picture; the input will be scaled if necessary (#gint)
* * "height": The height of the picture; the input will be scaled if necessary (#gint)
* * "alpha": The transparency of the picture; between 0.0 and 1.0. The blending
* is a simple copy when fully-transparent (0.0) and fully-opaque (1.0). (#gdouble)
* * "zorder": The z-order position of the picture in the composition (#guint)
*
* ## Sample pipelines
* |[
* gst-launch-1.0 \
* videotestsrc pattern=1 ! \
* video/x-raw,format=AYUV,framerate=\(fraction\)10/1,width=100,height=100 ! \
* videobox border-alpha=0 top=-70 bottom=-70 right=-220 ! \
* compositor name=comp sink_0::alpha=0.7 sink_1::alpha=0.5 ! \
* videoconvert ! xvimagesink \
* videotestsrc ! \
* video/x-raw,format=AYUV,framerate=\(fraction\)5/1,width=320,height=240 ! comp.
* ]| A pipeline to demonstrate compositor used together with videobox.
* This should show a 320x240 pixels video test source with some transparency
* showing the background checker pattern. Another video test source with just
* the snow pattern of 100x100 pixels is overlaid on top of the first one on
* the left vertically centered with a small transparency showing the first
* video test source behind and the checker pattern under it. Note that the
* framerate of the output video is 10 frames per second.
* |[
* gst-launch-1.0 videotestsrc pattern=1 ! \
* video/x-raw, framerate=\(fraction\)10/1, width=100, height=100 ! \
* compositor name=comp ! videoconvert ! ximagesink \
* videotestsrc ! \
* video/x-raw, framerate=\(fraction\)5/1, width=320, height=240 ! comp.
* ]| A pipeline to demostrate bgra comping. (This does not demonstrate alpha blending).
* |[
* gst-launch-1.0 videotestsrc pattern=1 ! \
* video/x-raw,format =I420, framerate=\(fraction\)10/1, width=100, height=100 ! \
* compositor name=comp ! videoconvert ! ximagesink \
* videotestsrc ! \
* video/x-raw,format=I420, framerate=\(fraction\)5/1, width=320, height=240 ! comp.
* ]| A pipeline to test I420
* |[
* gst-launch-1.0 compositor name=comp sink_1::alpha=0.5 sink_1::xpos=50 sink_1::ypos=50 ! \
* videoconvert ! ximagesink \
* videotestsrc pattern=snow timestamp-offset=3000000000 ! \
* "video/x-raw,format=AYUV,width=640,height=480,framerate=(fraction)30/1" ! \
* timeoverlay ! queue2 ! comp. \
* videotestsrc pattern=smpte ! \
* "video/x-raw,format=AYUV,width=800,height=600,framerate=(fraction)10/1" ! \
* timeoverlay ! queue2 ! comp.
* ]| A pipeline to demonstrate synchronized compositing (the second stream starts after 3 seconds)
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "compositor.h"
#include "compositorpad.h"
#ifdef DISABLE_ORC
#define orc_memset memset
#else
#include <orc/orcfunctions.h>
#endif
GST_DEBUG_CATEGORY_STATIC (gst_compositor_debug);
#define GST_CAT_DEFAULT gst_compositor_debug
#define FORMATS " { AYUV, BGRA, ARGB, RGBA, ABGR, Y444, Y42B, YUY2, UYVY, "\
" YVYU, I420, YV12, NV12, NV21, Y41B, RGB, BGR, xRGB, xBGR, "\
" RGBx, BGRx } "
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (FORMATS))
);
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%u",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (FORMATS))
);
static void gst_compositor_child_proxy_init (gpointer g_iface,
gpointer iface_data);
#define DEFAULT_PAD_XPOS 0
#define DEFAULT_PAD_YPOS 0
#define DEFAULT_PAD_WIDTH 0
#define DEFAULT_PAD_HEIGHT 0
#define DEFAULT_PAD_ALPHA 1.0
#define DEFAULT_PAD_CROSSFADE_RATIO -1.0
enum
{
PROP_PAD_0,
PROP_PAD_XPOS,
PROP_PAD_YPOS,
PROP_PAD_WIDTH,
PROP_PAD_HEIGHT,
PROP_PAD_ALPHA,
PROP_PAD_CROSSFADE_RATIO,
};
G_DEFINE_TYPE (GstCompositorPad, gst_compositor_pad,
GST_TYPE_VIDEO_AGGREGATOR_PAD);
static void
gst_compositor_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstCompositorPad *pad = GST_COMPOSITOR_PAD (object);
switch (prop_id) {
case PROP_PAD_XPOS:
g_value_set_int (value, pad->xpos);
break;
case PROP_PAD_YPOS:
g_value_set_int (value, pad->ypos);
break;
case PROP_PAD_WIDTH:
g_value_set_int (value, pad->width);
break;
case PROP_PAD_HEIGHT:
g_value_set_int (value, pad->height);
break;
case PROP_PAD_ALPHA:
g_value_set_double (value, pad->alpha);
break;
case PROP_PAD_CROSSFADE_RATIO:
g_value_set_double (value, pad->crossfade);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_compositor_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstCompositorPad *pad = GST_COMPOSITOR_PAD (object);
switch (prop_id) {
case PROP_PAD_XPOS:
pad->xpos = g_value_get_int (value);
break;
case PROP_PAD_YPOS:
pad->ypos = g_value_get_int (value);
break;
case PROP_PAD_WIDTH:
pad->width = g_value_get_int (value);
break;
case PROP_PAD_HEIGHT:
pad->height = g_value_get_int (value);
break;
case PROP_PAD_ALPHA:
pad->alpha = g_value_get_double (value);
break;
case PROP_PAD_CROSSFADE_RATIO:
pad->crossfade = g_value_get_double (value);
gst_video_aggregator_pad_set_needs_alpha (GST_VIDEO_AGGREGATOR_PAD (pad),
pad->crossfade >= 0.0f);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
_mixer_pad_get_output_size (GstCompositor * comp,
GstCompositorPad * comp_pad, gint out_par_n, gint out_par_d, gint * width,
gint * height)
{
GstVideoAggregatorPad *vagg_pad = GST_VIDEO_AGGREGATOR_PAD (comp_pad);
gint pad_width, pad_height;
guint dar_n, dar_d;
/* FIXME: Anything better we can do here? */
if (!vagg_pad->info.finfo
|| vagg_pad->info.finfo->format == GST_VIDEO_FORMAT_UNKNOWN) {
GST_DEBUG_OBJECT (comp_pad, "Have no caps yet");
*width = 0;
*height = 0;
return;
}
pad_width =
comp_pad->width <=
0 ? GST_VIDEO_INFO_WIDTH (&vagg_pad->info) : comp_pad->width;
pad_height =
comp_pad->height <=
0 ? GST_VIDEO_INFO_HEIGHT (&vagg_pad->info) : comp_pad->height;
if (!gst_video_calculate_display_ratio (&dar_n, &dar_d, pad_width, pad_height,
GST_VIDEO_INFO_PAR_N (&vagg_pad->info),
GST_VIDEO_INFO_PAR_D (&vagg_pad->info), out_par_n, out_par_d)) {
GST_WARNING_OBJECT (comp_pad, "Cannot calculate display aspect ratio");
*width = *height = 0;
return;
}
GST_LOG_OBJECT (comp_pad, "scaling %ux%u by %u/%u (%u/%u / %u/%u)", pad_width,
pad_height, dar_n, dar_d, GST_VIDEO_INFO_PAR_N (&vagg_pad->info),
GST_VIDEO_INFO_PAR_D (&vagg_pad->info), out_par_n, out_par_d);
if (pad_height % dar_n == 0) {
pad_width = gst_util_uint64_scale_int (pad_height, dar_n, dar_d);
} else if (pad_width % dar_d == 0) {
pad_height = gst_util_uint64_scale_int (pad_width, dar_d, dar_n);
} else {
pad_width = gst_util_uint64_scale_int (pad_height, dar_n, dar_d);
}
*width = pad_width;
*height = pad_height;
}
static gboolean
gst_compositor_pad_set_info (GstVideoAggregatorPad * pad,
GstVideoAggregator * vagg G_GNUC_UNUSED,
GstVideoInfo * current_info, GstVideoInfo * wanted_info)
{
GstCompositor *comp = GST_COMPOSITOR (vagg);
GstCompositorPad *cpad = GST_COMPOSITOR_PAD (pad);
gchar *colorimetry, *best_colorimetry;
const gchar *chroma, *best_chroma;
gint width, height;
if (!current_info->finfo)
return TRUE;
if (GST_VIDEO_INFO_FORMAT (current_info) == GST_VIDEO_FORMAT_UNKNOWN)
return TRUE;
if (cpad->convert)
gst_video_converter_free (cpad->convert);
cpad->convert = NULL;
if (GST_VIDEO_INFO_MULTIVIEW_MODE (current_info) !=
GST_VIDEO_MULTIVIEW_MODE_NONE
&& GST_VIDEO_INFO_MULTIVIEW_MODE (current_info) !=
GST_VIDEO_MULTIVIEW_MODE_MONO) {
GST_FIXME_OBJECT (pad, "Multiview support is not implemented yet");
return FALSE;
}
colorimetry = gst_video_colorimetry_to_string (&(current_info->colorimetry));
chroma = gst_video_chroma_to_string (current_info->chroma_site);
best_colorimetry =
gst_video_colorimetry_to_string (&(wanted_info->colorimetry));
best_chroma = gst_video_chroma_to_string (wanted_info->chroma_site);
_mixer_pad_get_output_size (comp, cpad, GST_VIDEO_INFO_PAR_N (&vagg->info),
GST_VIDEO_INFO_PAR_D (&vagg->info), &width, &height);
if (GST_VIDEO_INFO_FORMAT (wanted_info) !=
GST_VIDEO_INFO_FORMAT (current_info)
|| g_strcmp0 (colorimetry, best_colorimetry)
|| g_strcmp0 (chroma, best_chroma)
|| width != current_info->width || height != current_info->height) {
GstVideoInfo tmp_info;
/* Initialize with the wanted video format and our original width and
* height as we don't want to rescale. Then copy over the wanted
* colorimetry, and chroma-site and our current pixel-aspect-ratio
* and other relevant fields.
*/
gst_video_info_set_format (&tmp_info, GST_VIDEO_INFO_FORMAT (wanted_info),
width, height);
tmp_info.chroma_site = wanted_info->chroma_site;
tmp_info.colorimetry = wanted_info->colorimetry;
tmp_info.par_n = wanted_info->par_n;
tmp_info.par_d = wanted_info->par_d;
tmp_info.fps_n = current_info->fps_n;
tmp_info.fps_d = current_info->fps_d;
tmp_info.flags = current_info->flags;
tmp_info.interlace_mode = current_info->interlace_mode;
GST_DEBUG_OBJECT (pad, "This pad will be converted from format %s to %s, "
"colorimetry %s to %s, chroma-site %s to %s, "
"width/height %d/%d to %d/%d",
current_info->finfo->name, tmp_info.finfo->name,
colorimetry, best_colorimetry,
chroma, best_chroma,
current_info->width, current_info->height, width, height);
cpad->convert = gst_video_converter_new (current_info, &tmp_info, NULL);
cpad->conversion_info = tmp_info;
if (!cpad->convert) {
g_free (colorimetry);
g_free (best_colorimetry);
GST_WARNING_OBJECT (pad, "No path found for conversion");
return FALSE;
}
} else {
cpad->conversion_info = *current_info;
GST_DEBUG_OBJECT (pad, "This pad will not need conversion");
}
g_free (colorimetry);
g_free (best_colorimetry);
return TRUE;
}
/* Test whether rectangle2 contains rectangle 1 (geometrically) */
static gboolean
is_rectangle_contained (GstVideoRectangle rect1, GstVideoRectangle rect2)
{
if ((rect2.x <= rect1.x) && (rect2.y <= rect1.y) &&
((rect2.x + rect2.w) >= (rect1.x + rect1.w)) &&
((rect2.y + rect2.h) >= (rect1.y + rect1.h)))
return TRUE;
return FALSE;
}
static GstVideoRectangle
clamp_rectangle (gint x, gint y, gint w, gint h, gint outer_width,
gint outer_height)
{
gint x2 = x + w;
gint y2 = y + h;
GstVideoRectangle clamped;
/* Clamp the x/y coordinates of this frame to the output boundaries to cover
* the case where (say, with negative xpos/ypos or w/h greater than the output
* size) the non-obscured portion of the frame could be outside the bounds of
* the video itself and hence not visible at all */
clamped.x = CLAMP (x, 0, outer_width);
clamped.y = CLAMP (y, 0, outer_height);
clamped.w = CLAMP (x2, 0, outer_width) - clamped.x;
clamped.h = CLAMP (y2, 0, outer_height) - clamped.y;
return clamped;
}
static gboolean
gst_compositor_pad_prepare_frame (GstVideoAggregatorPad * pad,
GstVideoAggregator * vagg, GstBuffer * buffer,
GstVideoFrame * prepared_frame)
{
GstCompositor *comp = GST_COMPOSITOR (vagg);
GstCompositorPad *cpad = GST_COMPOSITOR_PAD (pad);
guint outsize;
GstVideoFrame frame;
static GstAllocationParams params = { 0, 15, 0, 0, };
gint width, height;
gboolean frame_obscured = FALSE;
GList *l;
/* The rectangle representing this frame, clamped to the video's boundaries.
* Due to the clamping, this is different from the frame width/height above. */
GstVideoRectangle frame_rect;
/* There's three types of width/height here:
* 1. GST_VIDEO_FRAME_WIDTH/HEIGHT:
* The frame width/height (same as pad->info.height/width;
* see gst_video_frame_map())
* 2. cpad->width/height:
* The optional pad property for scaling the frame (if zero, the video is
* left unscaled)
* 3. conversion_info.width/height:
* Equal to cpad->width/height if it's set, otherwise it's the pad
* width/height. See ->set_info()
* */
_mixer_pad_get_output_size (comp, cpad, GST_VIDEO_INFO_PAR_N (&vagg->info),
GST_VIDEO_INFO_PAR_D (&vagg->info), &width, &height);
/* The only thing that can change here is the width
* and height, otherwise set_info would've been called */
if (GST_VIDEO_INFO_WIDTH (&cpad->conversion_info) != width ||
GST_VIDEO_INFO_HEIGHT (&cpad->conversion_info) != height) {
gchar *colorimetry, *wanted_colorimetry;
const gchar *chroma, *wanted_chroma;
/* We might end up with no converter afterwards if
* the only reason for conversion was a different
* width or height
*/
if (cpad->convert)
gst_video_converter_free (cpad->convert);
cpad->convert = NULL;
colorimetry = gst_video_colorimetry_to_string (&pad->info.colorimetry);
chroma = gst_video_chroma_to_string (pad->info.chroma_site);
wanted_colorimetry =
gst_video_colorimetry_to_string (&cpad->conversion_info.colorimetry);
wanted_chroma =
gst_video_chroma_to_string (cpad->conversion_info.chroma_site);
if (GST_VIDEO_INFO_FORMAT (&pad->info) !=
GST_VIDEO_INFO_FORMAT (&cpad->conversion_info)
|| g_strcmp0 (colorimetry, wanted_colorimetry)
|| g_strcmp0 (chroma, wanted_chroma)
|| width != GST_VIDEO_INFO_WIDTH (&pad->info)
|| height != GST_VIDEO_INFO_HEIGHT (&pad->info)) {
GstVideoInfo tmp_info;
gst_video_info_set_format (&tmp_info, cpad->conversion_info.finfo->format,
width, height);
tmp_info.chroma_site = cpad->conversion_info.chroma_site;
tmp_info.colorimetry = cpad->conversion_info.colorimetry;
tmp_info.par_n = vagg->info.par_n;
tmp_info.par_d = vagg->info.par_d;
tmp_info.fps_n = cpad->conversion_info.fps_n;
tmp_info.fps_d = cpad->conversion_info.fps_d;
tmp_info.flags = cpad->conversion_info.flags;
tmp_info.interlace_mode = cpad->conversion_info.interlace_mode;
GST_DEBUG_OBJECT (pad, "This pad will be converted from %d to %d",
GST_VIDEO_INFO_FORMAT (&pad->info),
GST_VIDEO_INFO_FORMAT (&tmp_info));
cpad->convert = gst_video_converter_new (&pad->info, &tmp_info, NULL);
cpad->conversion_info = tmp_info;
if (!cpad->convert) {
GST_WARNING_OBJECT (pad, "No path found for conversion");
g_free (colorimetry);
g_free (wanted_colorimetry);
return FALSE;
}
} else {
GST_VIDEO_INFO_WIDTH (&cpad->conversion_info) = width;
GST_VIDEO_INFO_HEIGHT (&cpad->conversion_info) = height;
}
g_free (colorimetry);
g_free (wanted_colorimetry);
}
if (cpad->alpha == 0.0) {
GST_DEBUG_OBJECT (vagg, "Pad has alpha 0.0, not converting frame");
goto done;
}
frame_rect = clamp_rectangle (cpad->xpos, cpad->ypos, width, height,
GST_VIDEO_INFO_WIDTH (&vagg->info), GST_VIDEO_INFO_HEIGHT (&vagg->info));
if (frame_rect.w == 0 || frame_rect.h == 0) {
GST_DEBUG_OBJECT (vagg, "Resulting frame is zero-width or zero-height "
"(w: %i, h: %i), skipping", frame_rect.w, frame_rect.h);
goto done;
}
GST_OBJECT_LOCK (vagg);
/* Check if we are crossfading the pad one way or another */
l = g_list_find (GST_ELEMENT (vagg)->sinkpads, pad);
if ((l->prev && GST_COMPOSITOR_PAD (l->prev->data)->crossfade >= 0.0) ||
(GST_COMPOSITOR_PAD (pad)->crossfade >= 0.0)) {
GST_DEBUG_OBJECT (pad, "Is being crossfaded with previous pad");
l = NULL;
} else {
l = l->next;
}
/* Check if this frame is obscured by a higher-zorder frame
* TODO: Also skip a frame if it's obscured by a combination of
* higher-zorder frames */
for (; l; l = l->next) {
GstVideoRectangle frame2_rect;
GstVideoAggregatorPad *pad2 = l->data;
GstCompositorPad *cpad2 = GST_COMPOSITOR_PAD (pad2);
gint pad2_width, pad2_height;
_mixer_pad_get_output_size (comp, cpad2, GST_VIDEO_INFO_PAR_N (&vagg->info),
GST_VIDEO_INFO_PAR_D (&vagg->info), &pad2_width, &pad2_height);
/* We don't need to clamp the coords of the second rectangle */
frame2_rect.x = cpad2->xpos;
frame2_rect.y = cpad2->ypos;
/* This is effectively what set_info and the above conversion
* code do to calculate the desired width/height */
frame2_rect.w = pad2_width;
frame2_rect.h = pad2_height;
/* Check if there's a buffer to be aggregated, ensure it can't have an alpha
* channel, then check opacity and frame boundaries */
if (gst_video_aggregator_pad_has_current_buffer (pad2)
&& cpad2->alpha == 1.0 && !GST_VIDEO_INFO_HAS_ALPHA (&pad2->info)
&& is_rectangle_contained (frame_rect, frame2_rect)) {
frame_obscured = TRUE;
GST_DEBUG_OBJECT (pad, "%ix%i@(%i,%i) obscured by %s %ix%i@(%i,%i) "
"in output of size %ix%i; skipping frame", frame_rect.w, frame_rect.h,
frame_rect.x, frame_rect.y, GST_PAD_NAME (pad2), frame2_rect.w,
frame2_rect.h, frame2_rect.x, frame2_rect.y,
GST_VIDEO_INFO_WIDTH (&vagg->info),
GST_VIDEO_INFO_HEIGHT (&vagg->info));
break;
}
}
GST_OBJECT_UNLOCK (vagg);
if (frame_obscured)
goto done;
if (!gst_video_frame_map (&frame, &pad->info, buffer, GST_MAP_READ)) {
GST_WARNING_OBJECT (vagg, "Could not map input buffer");
return FALSE;
}
if (cpad->convert) {
gint converted_size;
GstVideoFrame converted_frame;
GstBuffer *converted_buf = NULL;
/* We wait until here to set the conversion infos, in case vagg->info changed */
converted_size = GST_VIDEO_INFO_SIZE (&cpad->conversion_info);
outsize = GST_VIDEO_INFO_SIZE (&vagg->info);
converted_size = converted_size > outsize ? converted_size : outsize;
converted_buf = gst_buffer_new_allocate (NULL, converted_size, &params);
if (!gst_video_frame_map (&converted_frame, &(cpad->conversion_info),
converted_buf, GST_MAP_READWRITE)) {
GST_WARNING_OBJECT (vagg, "Could not map converted frame");
gst_video_frame_unmap (&frame);
return FALSE;
}
gst_video_converter_frame (cpad->convert, &frame, &converted_frame);
cpad->converted_buffer = converted_buf;
gst_video_frame_unmap (&frame);
*prepared_frame = converted_frame;
} else {
*prepared_frame = frame;
}
done:
return TRUE;
}
static void
gst_compositor_pad_clean_frame (GstVideoAggregatorPad * pad,
GstVideoAggregator * vagg, GstVideoFrame * prepared_frame)
{
GstCompositorPad *cpad = GST_COMPOSITOR_PAD (pad);
if (prepared_frame->buffer) {
gst_video_frame_unmap (prepared_frame);
memset (prepared_frame, 0, sizeof (GstVideoFrame));
}
if (cpad->converted_buffer) {
gst_buffer_unref (cpad->converted_buffer);
cpad->converted_buffer = NULL;
}
}
static void
gst_compositor_pad_finalize (GObject * object)
{
GstCompositorPad *pad = GST_COMPOSITOR_PAD (object);
if (pad->convert)
gst_video_converter_free (pad->convert);
pad->convert = NULL;
G_OBJECT_CLASS (gst_compositor_pad_parent_class)->finalize (object);
}
static void
gst_compositor_pad_class_init (GstCompositorPadClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstVideoAggregatorPadClass *vaggpadclass =
(GstVideoAggregatorPadClass *) klass;
gobject_class->set_property = gst_compositor_pad_set_property;
gobject_class->get_property = gst_compositor_pad_get_property;
gobject_class->finalize = gst_compositor_pad_finalize;
g_object_class_install_property (gobject_class, PROP_PAD_XPOS,
g_param_spec_int ("xpos", "X Position", "X Position of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_XPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PAD_YPOS,
g_param_spec_int ("ypos", "Y Position", "Y Position of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_YPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PAD_WIDTH,
g_param_spec_int ("width", "Width", "Width of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_WIDTH,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PAD_HEIGHT,
g_param_spec_int ("height", "Height", "Height of the picture",
G_MININT, G_MAXINT, DEFAULT_PAD_HEIGHT,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PAD_ALPHA,
g_param_spec_double ("alpha", "Alpha", "Alpha of the picture", 0.0, 1.0,
DEFAULT_PAD_ALPHA,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PAD_CROSSFADE_RATIO,
g_param_spec_double ("crossfade-ratio", "Crossfade ratio",
"The crossfade ratio to use while crossfading with the following pad."
"A value inferior to 0 means no crossfading.",
-1.0, 1.0, DEFAULT_PAD_CROSSFADE_RATIO,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
vaggpadclass->set_info = GST_DEBUG_FUNCPTR (gst_compositor_pad_set_info);
vaggpadclass->prepare_frame =
GST_DEBUG_FUNCPTR (gst_compositor_pad_prepare_frame);
vaggpadclass->clean_frame =
GST_DEBUG_FUNCPTR (gst_compositor_pad_clean_frame);
}
static void
gst_compositor_pad_init (GstCompositorPad * compo_pad)
{
compo_pad->xpos = DEFAULT_PAD_XPOS;
compo_pad->ypos = DEFAULT_PAD_YPOS;
compo_pad->alpha = DEFAULT_PAD_ALPHA;
compo_pad->crossfade = DEFAULT_PAD_CROSSFADE_RATIO;
}
/* GstCompositor */
#define DEFAULT_BACKGROUND COMPOSITOR_BACKGROUND_CHECKER
enum
{
PROP_0,
PROP_BACKGROUND,
};
#define GST_TYPE_COMPOSITOR_BACKGROUND (gst_compositor_background_get_type())
static GType
gst_compositor_background_get_type (void)
{
static GType compositor_background_type = 0;
static const GEnumValue compositor_background[] = {
{COMPOSITOR_BACKGROUND_CHECKER, "Checker pattern", "checker"},
{COMPOSITOR_BACKGROUND_BLACK, "Black", "black"},
{COMPOSITOR_BACKGROUND_WHITE, "White", "white"},
{COMPOSITOR_BACKGROUND_TRANSPARENT,
"Transparent Background to enable further compositing", "transparent"},
{0, NULL, NULL},
};
if (!compositor_background_type) {
compositor_background_type =
g_enum_register_static ("GstCompositorBackground",
compositor_background);
}
return compositor_background_type;
}
static void
gst_compositor_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstCompositor *self = GST_COMPOSITOR (object);
switch (prop_id) {
case PROP_BACKGROUND:
g_value_set_enum (value, self->background);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_compositor_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstCompositor *self = GST_COMPOSITOR (object);
switch (prop_id) {
case PROP_BACKGROUND:
self->background = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
#define gst_compositor_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstCompositor, gst_compositor,
GST_TYPE_VIDEO_AGGREGATOR, G_IMPLEMENT_INTERFACE (GST_TYPE_CHILD_PROXY,
gst_compositor_child_proxy_init));
static gboolean
set_functions (GstCompositor * self, GstVideoInfo * info)
{
gboolean ret = FALSE;
self->blend = NULL;
self->overlay = NULL;
self->fill_checker = NULL;
self->fill_color = NULL;
switch (GST_VIDEO_INFO_FORMAT (info)) {
case GST_VIDEO_FORMAT_AYUV:
self->blend = gst_compositor_blend_ayuv;
self->overlay = gst_compositor_overlay_ayuv;
self->fill_checker = gst_compositor_fill_checker_ayuv;
self->fill_color = gst_compositor_fill_color_ayuv;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_ARGB:
self->blend = gst_compositor_blend_argb;
self->overlay = gst_compositor_overlay_argb;
self->fill_checker = gst_compositor_fill_checker_argb;
self->fill_color = gst_compositor_fill_color_argb;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_BGRA:
self->blend = gst_compositor_blend_bgra;
self->overlay = gst_compositor_overlay_bgra;
self->fill_checker = gst_compositor_fill_checker_bgra;
self->fill_color = gst_compositor_fill_color_bgra;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_ABGR:
self->blend = gst_compositor_blend_abgr;
self->overlay = gst_compositor_overlay_abgr;
self->fill_checker = gst_compositor_fill_checker_abgr;
self->fill_color = gst_compositor_fill_color_abgr;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_RGBA:
self->blend = gst_compositor_blend_rgba;
self->overlay = gst_compositor_overlay_rgba;
self->fill_checker = gst_compositor_fill_checker_rgba;
self->fill_color = gst_compositor_fill_color_rgba;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_Y444:
self->blend = gst_compositor_blend_y444;
self->overlay = self->blend;
self->fill_checker = gst_compositor_fill_checker_y444;
self->fill_color = gst_compositor_fill_color_y444;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_Y42B:
self->blend = gst_compositor_blend_y42b;
self->overlay = self->blend;
self->fill_checker = gst_compositor_fill_checker_y42b;
self->fill_color = gst_compositor_fill_color_y42b;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_YUY2:
self->blend = gst_compositor_blend_yuy2;
self->overlay = self->blend;
self->fill_checker = gst_compositor_fill_checker_yuy2;
self->fill_color = gst_compositor_fill_color_yuy2;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_UYVY:
self->blend = gst_compositor_blend_uyvy;
self->overlay = self->blend;
self->fill_checker = gst_compositor_fill_checker_uyvy;
self->fill_color = gst_compositor_fill_color_uyvy;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_YVYU:
self->blend = gst_compositor_blend_yvyu;
self->overlay = self->blend;
self->fill_checker = gst_compositor_fill_checker_yvyu;
self->fill_color = gst_compositor_fill_color_yvyu;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_I420:
self->blend = gst_compositor_blend_i420;
self->overlay = self->blend;
self->fill_checker = gst_compositor_fill_checker_i420;
self->fill_color = gst_compositor_fill_color_i420;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_YV12:
self->blend = gst_compositor_blend_yv12;
self->overlay = self->blend;
self->fill_checker = gst_compositor_fill_checker_yv12;
self->fill_color = gst_compositor_fill_color_yv12;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_NV12:
self->blend = gst_compositor_blend_nv12;
self->overlay = self->blend;
self->fill_checker = gst_compositor_fill_checker_nv12;
self->fill_color = gst_compositor_fill_color_nv12;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_NV21:
self->blend = gst_compositor_blend_nv21;
self->overlay = self->blend;
self->fill_checker = gst_compositor_fill_checker_nv21;
self->fill_color = gst_compositor_fill_color_nv21;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_Y41B:
self->blend = gst_compositor_blend_y41b;
self->overlay = self->blend;
self->fill_checker = gst_compositor_fill_checker_y41b;
self->fill_color = gst_compositor_fill_color_y41b;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_RGB:
self->blend = gst_compositor_blend_rgb;
self->overlay = self->blend;
self->fill_checker = gst_compositor_fill_checker_rgb;
self->fill_color = gst_compositor_fill_color_rgb;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_BGR:
self->blend = gst_compositor_blend_bgr;
self->overlay = self->blend;
self->fill_checker = gst_compositor_fill_checker_bgr;
self->fill_color = gst_compositor_fill_color_bgr;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_xRGB:
self->blend = gst_compositor_blend_xrgb;
self->overlay = self->blend;
self->fill_checker = gst_compositor_fill_checker_xrgb;
self->fill_color = gst_compositor_fill_color_xrgb;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_xBGR:
self->blend = gst_compositor_blend_xbgr;
self->overlay = self->blend;
self->fill_checker = gst_compositor_fill_checker_xbgr;
self->fill_color = gst_compositor_fill_color_xbgr;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_RGBx:
self->blend = gst_compositor_blend_rgbx;
self->overlay = self->blend;
self->fill_checker = gst_compositor_fill_checker_rgbx;
self->fill_color = gst_compositor_fill_color_rgbx;
ret = TRUE;
break;
case GST_VIDEO_FORMAT_BGRx:
self->blend = gst_compositor_blend_bgrx;
self->overlay = self->blend;
self->fill_checker = gst_compositor_fill_checker_bgrx;
self->fill_color = gst_compositor_fill_color_bgrx;
ret = TRUE;
break;
default:
break;
}
return ret;
}
static GstCaps *
_fixate_caps (GstAggregator * agg, GstCaps * caps)
{
GstVideoAggregator *vagg = GST_VIDEO_AGGREGATOR (agg);
GList *l;
gint best_width = -1, best_height = -1;
gint best_fps_n = -1, best_fps_d = -1;
gint par_n, par_d;
gdouble best_fps = 0.;
GstCaps *ret = NULL;
GstStructure *s;
ret = gst_caps_make_writable (caps);
/* we need this to calculate how large to make the output frame */
s = gst_caps_get_structure (ret, 0);
if (gst_structure_has_field (s, "pixel-aspect-ratio")) {
gst_structure_fixate_field_nearest_fraction (s, "pixel-aspect-ratio", 1, 1);
gst_structure_get_fraction (s, "pixel-aspect-ratio", &par_n, &par_d);
} else {
par_n = par_d = 1;
}
GST_OBJECT_LOCK (vagg);
for (l = GST_ELEMENT (vagg)->sinkpads; l; l = l->next) {
GstVideoAggregatorPad *vaggpad = l->data;
GstCompositorPad *compositor_pad = GST_COMPOSITOR_PAD (vaggpad);
gint this_width, this_height;
gint width, height;
gint fps_n, fps_d;
gdouble cur_fps;
fps_n = GST_VIDEO_INFO_FPS_N (&vaggpad->info);
fps_d = GST_VIDEO_INFO_FPS_D (&vaggpad->info);
_mixer_pad_get_output_size (GST_COMPOSITOR (vagg), compositor_pad, par_n,
par_d, &width, &height);
if (width == 0 || height == 0)
continue;
this_width = width + MAX (compositor_pad->xpos, 0);
this_height = height + MAX (compositor_pad->ypos, 0);
if (best_width < this_width)
best_width = this_width;
if (best_height < this_height)
best_height = this_height;
if (fps_d == 0)
cur_fps = 0.0;
else
gst_util_fraction_to_double (fps_n, fps_d, &cur_fps);
if (best_fps < cur_fps) {
best_fps = cur_fps;
best_fps_n = fps_n;
best_fps_d = fps_d;
}
}
GST_OBJECT_UNLOCK (vagg);
if (best_fps_n <= 0 || best_fps_d <= 0 || best_fps == 0.0) {
best_fps_n = 25;
best_fps_d = 1;
best_fps = 25.0;
}
gst_structure_fixate_field_nearest_int (s, "width", best_width);
gst_structure_fixate_field_nearest_int (s, "height", best_height);
gst_structure_fixate_field_nearest_fraction (s, "framerate", best_fps_n,
best_fps_d);
ret = gst_caps_fixate (ret);
return ret;
}
static gboolean
_negotiated_caps (GstAggregator * agg, GstCaps * caps)
{
GstVideoInfo v_info;
GST_DEBUG_OBJECT (agg, "Negotiated caps %" GST_PTR_FORMAT, caps);
if (!gst_video_info_from_caps (&v_info, caps))
return FALSE;
if (!set_functions (GST_COMPOSITOR (agg), &v_info)) {
GST_ERROR_OBJECT (agg, "Failed to setup vfuncs");
return FALSE;
}
return GST_AGGREGATOR_CLASS (parent_class)->negotiated_src_caps (agg, caps);
}
/* Fills frame with transparent pixels if @nframe is NULL otherwise copy @frame
* properties and fill @nframes with transparent pixels */
static GstFlowReturn
gst_compositor_fill_transparent (GstCompositor * self, GstVideoFrame * frame,
GstVideoFrame * nframe)
{
guint plane, num_planes, height, i;
if (nframe) {
GstBuffer *cbuffer = gst_buffer_copy_deep (frame->buffer);
if (!gst_video_frame_map (nframe, &frame->info, cbuffer, GST_MAP_WRITE)) {
GST_WARNING_OBJECT (self, "Could not map output buffer");
return GST_FLOW_ERROR;
}
} else {
nframe = frame;
}
num_planes = GST_VIDEO_FRAME_N_PLANES (nframe);
for (plane = 0; plane < num_planes; ++plane) {
guint8 *pdata;
gsize rowsize, plane_stride;
pdata = GST_VIDEO_FRAME_PLANE_DATA (nframe, plane);
plane_stride = GST_VIDEO_FRAME_PLANE_STRIDE (nframe, plane);
rowsize = GST_VIDEO_FRAME_COMP_WIDTH (nframe, plane)
* GST_VIDEO_FRAME_COMP_PSTRIDE (nframe, plane);
height = GST_VIDEO_FRAME_COMP_HEIGHT (nframe, plane);
for (i = 0; i < height; ++i) {
memset (pdata, 0, rowsize);
pdata += plane_stride;
}
}
return GST_FLOW_OK;
}
/* WITH GST_OBJECT_LOCK !!
* Returns: %TRUE if outframe is allready ready to be used as we are using
* a transparent background and all pads have already been crossfaded
* %FALSE otherwise
*/
static gboolean
gst_compositor_crossfade_frames (GstCompositor * self, GstVideoFrame * outframe)
{
GList *l;
gboolean all_crossfading = FALSE;
GstVideoAggregator *vagg = GST_VIDEO_AGGREGATOR (self);
if (self->background == COMPOSITOR_BACKGROUND_TRANSPARENT) {
all_crossfading = TRUE;
for (l = GST_ELEMENT (self)->sinkpads; l; l = l->next) {
GstCompositorPad *compo_pad = GST_COMPOSITOR_PAD (l->data);
if (compo_pad->crossfade < 0.0 && l->next &&
GST_COMPOSITOR_PAD (l->next->data)->crossfade < 0) {
all_crossfading = FALSE;
break;
}
}
}
for (l = GST_ELEMENT (self)->sinkpads; l; l = l->next) {
GstVideoAggregatorPad *pad = l->data;
GstCompositorPad *compo_pad = GST_COMPOSITOR_PAD (pad);
GstVideoFrame *prepared_frame =
gst_video_aggregator_pad_get_prepared_frame (pad);
if (compo_pad->crossfade >= 0.0f && prepared_frame) {
gfloat alpha = compo_pad->crossfade * compo_pad->alpha;
GstVideoAggregatorPad *npad = l->next ? l->next->data : NULL;
GstVideoFrame *next_prepared_frame;
GstVideoFrame nframe;
next_prepared_frame =
npad ? gst_video_aggregator_pad_get_prepared_frame (npad) : NULL;
if (!all_crossfading) {
gst_compositor_fill_transparent (self, outframe, &nframe);
} else {
nframe = *outframe;
}
self->overlay (prepared_frame,
compo_pad->crossfaded ? 0 : compo_pad->xpos,
compo_pad->crossfaded ? 0 : compo_pad->ypos,
alpha, &nframe, COMPOSITOR_BLEND_MODE_ADDITIVE);
if (npad && next_prepared_frame) {
GstCompositorPad *next_compo_pad = GST_COMPOSITOR_PAD (npad);
alpha = (1.0 - compo_pad->crossfade) * next_compo_pad->alpha;
self->overlay (next_prepared_frame, next_compo_pad->xpos,
next_compo_pad->ypos, alpha, &nframe,
COMPOSITOR_BLEND_MODE_ADDITIVE);
/* Replace frame with current frame */
gst_compositor_pad_clean_frame (npad, vagg, next_prepared_frame);
if (!all_crossfading)
*next_prepared_frame = nframe;
next_compo_pad->crossfaded = TRUE;
/* Frame is now consumed, clean it up */
gst_compositor_pad_clean_frame (pad, vagg, prepared_frame);
} else {
GST_LOG_OBJECT (self, "Simply fading out as no following pad found");
gst_compositor_pad_clean_frame (pad, vagg, prepared_frame);
if (!all_crossfading)
*prepared_frame = nframe;
compo_pad->crossfaded = TRUE;
}
}
}
if (all_crossfading)
for (l = GST_ELEMENT (self)->sinkpads; l; l = l->next)
GST_COMPOSITOR_PAD (l->data)->crossfaded = FALSE;
return all_crossfading;
}
static GstFlowReturn
gst_compositor_aggregate_frames (GstVideoAggregator * vagg, GstBuffer * outbuf)
{
GList *l;
GstCompositor *self = GST_COMPOSITOR (vagg);
BlendFunction composite;
GstVideoFrame out_frame, *outframe;
if (!gst_video_frame_map (&out_frame, &vagg->info, outbuf, GST_MAP_WRITE)) {
GST_WARNING_OBJECT (vagg, "Could not map output buffer");
return GST_FLOW_ERROR;
}
outframe = &out_frame;
/* default to blending */
composite = self->blend;
/* TODO: If the frames to be composited completely obscure the background,
* don't bother drawing the background at all. */
switch (self->background) {
case COMPOSITOR_BACKGROUND_CHECKER:
self->fill_checker (outframe);
break;
case COMPOSITOR_BACKGROUND_BLACK:
self->fill_color (outframe, 16, 128, 128);
break;
case COMPOSITOR_BACKGROUND_WHITE:
self->fill_color (outframe, 240, 128, 128);
break;
case COMPOSITOR_BACKGROUND_TRANSPARENT:
gst_compositor_fill_transparent (self, outframe, NULL);
/* use overlay to keep background transparent */
composite = self->overlay;
break;
}
GST_OBJECT_LOCK (vagg);
/* First mix the crossfade frames as required */
if (!gst_compositor_crossfade_frames (self, outframe)) {
for (l = GST_ELEMENT (vagg)->sinkpads; l; l = l->next) {
GstVideoAggregatorPad *pad = l->data;
GstCompositorPad *compo_pad = GST_COMPOSITOR_PAD (pad);
GstVideoFrame *prepared_frame =
gst_video_aggregator_pad_get_prepared_frame (pad);
if (prepared_frame != NULL) {
composite (prepared_frame,
compo_pad->crossfaded ? 0 : compo_pad->xpos,
compo_pad->crossfaded ? 0 : compo_pad->ypos, compo_pad->alpha,
outframe, COMPOSITOR_BLEND_MODE_NORMAL);
compo_pad->crossfaded = FALSE;
}
}
}
GST_OBJECT_UNLOCK (vagg);
gst_video_frame_unmap (outframe);
return GST_FLOW_OK;
}
static GstPad *
gst_compositor_request_new_pad (GstElement * element, GstPadTemplate * templ,
const gchar * req_name, const GstCaps * caps)
{
GstPad *newpad;
newpad = (GstPad *)
GST_ELEMENT_CLASS (parent_class)->request_new_pad (element,
templ, req_name, caps);
if (newpad == NULL)
goto could_not_create;
gst_child_proxy_child_added (GST_CHILD_PROXY (element), G_OBJECT (newpad),
GST_OBJECT_NAME (newpad));
return newpad;
could_not_create:
{
GST_DEBUG_OBJECT (element, "could not create/add pad");
return NULL;
}
}
static void
gst_compositor_release_pad (GstElement * element, GstPad * pad)
{
GstCompositor *compositor;
compositor = GST_COMPOSITOR (element);
GST_DEBUG_OBJECT (compositor, "release pad %s:%s", GST_DEBUG_PAD_NAME (pad));
gst_child_proxy_child_removed (GST_CHILD_PROXY (compositor), G_OBJECT (pad),
GST_OBJECT_NAME (pad));
GST_ELEMENT_CLASS (parent_class)->release_pad (element, pad);
}
static gboolean
_sink_query (GstAggregator * agg, GstAggregatorPad * bpad, GstQuery * query)
{
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_ALLOCATION:{
GstCaps *caps;
GstVideoInfo info;
GstBufferPool *pool;
guint size;
GstStructure *structure;
gst_query_parse_allocation (query, &caps, NULL);
if (caps == NULL)
return FALSE;
if (!gst_video_info_from_caps (&info, caps))
return FALSE;
size = GST_VIDEO_INFO_SIZE (&info);
pool = gst_video_buffer_pool_new ();
structure = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set_params (structure, caps, size, 0, 0);
if (!gst_buffer_pool_set_config (pool, structure)) {
gst_object_unref (pool);
return FALSE;
}
gst_query_add_allocation_pool (query, pool, size, 0, 0);
gst_object_unref (pool);
gst_query_add_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL);
return TRUE;
}
default:
return GST_AGGREGATOR_CLASS (parent_class)->sink_query (agg, bpad, query);
}
}
/* GObject boilerplate */
static void
gst_compositor_class_init (GstCompositorClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
GstVideoAggregatorClass *videoaggregator_class =
(GstVideoAggregatorClass *) klass;
GstAggregatorClass *agg_class = (GstAggregatorClass *) klass;
gobject_class->get_property = gst_compositor_get_property;
gobject_class->set_property = gst_compositor_set_property;
gstelement_class->request_new_pad =
GST_DEBUG_FUNCPTR (gst_compositor_request_new_pad);
gstelement_class->release_pad =
GST_DEBUG_FUNCPTR (gst_compositor_release_pad);
agg_class->sink_query = _sink_query;
agg_class->fixate_src_caps = _fixate_caps;
agg_class->negotiated_src_caps = _negotiated_caps;
videoaggregator_class->aggregate_frames = gst_compositor_aggregate_frames;
g_object_class_install_property (gobject_class, PROP_BACKGROUND,
g_param_spec_enum ("background", "Background", "Background type",
GST_TYPE_COMPOSITOR_BACKGROUND,
DEFAULT_BACKGROUND, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_static_pad_template_with_gtype (gstelement_class,
&src_factory, GST_TYPE_AGGREGATOR_PAD);
gst_element_class_add_static_pad_template_with_gtype (gstelement_class,
&sink_factory, GST_TYPE_COMPOSITOR_PAD);
gst_element_class_set_static_metadata (gstelement_class, "Compositor",
"Filter/Editor/Video/Compositor",
"Composite multiple video streams", "Wim Taymans <wim@fluendo.com>, "
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
}
static void
gst_compositor_init (GstCompositor * self)
{
/* initialize variables */
self->background = DEFAULT_BACKGROUND;
}
/* GstChildProxy implementation */
static GObject *
gst_compositor_child_proxy_get_child_by_index (GstChildProxy * child_proxy,
guint index)
{
GstCompositor *compositor = GST_COMPOSITOR (child_proxy);
GObject *obj = NULL;
GST_OBJECT_LOCK (compositor);
obj = g_list_nth_data (GST_ELEMENT_CAST (compositor)->sinkpads, index);
if (obj)
gst_object_ref (obj);
GST_OBJECT_UNLOCK (compositor);
return obj;
}
static guint
gst_compositor_child_proxy_get_children_count (GstChildProxy * child_proxy)
{
guint count = 0;
GstCompositor *compositor = GST_COMPOSITOR (child_proxy);
GST_OBJECT_LOCK (compositor);
count = GST_ELEMENT_CAST (compositor)->numsinkpads;
GST_OBJECT_UNLOCK (compositor);
GST_INFO_OBJECT (compositor, "Children Count: %d", count);
return count;
}
static void
gst_compositor_child_proxy_init (gpointer g_iface, gpointer iface_data)
{
GstChildProxyInterface *iface = g_iface;
iface->get_child_by_index = gst_compositor_child_proxy_get_child_by_index;
iface->get_children_count = gst_compositor_child_proxy_get_children_count;
}
/* Element registration */
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_compositor_debug, "compositor", 0, "compositor");
gst_compositor_init_blend ();
return gst_element_register (plugin, "compositor", GST_RANK_PRIMARY + 1,
GST_TYPE_COMPOSITOR);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
compositor,
"Compositor", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME,
GST_PACKAGE_ORIGIN)
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