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gstreamer/subprojects/gst-plugins-base/gst/compositor/compositor.c
Mathieu Duponchelle 7988acad36 compositor: fix prepare_frame obscuring check 
A pad without a buffer or with a GAP buffer cannot obscure a
pad below it. Ignore those when considering whether a pad should
be drawn.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/708>
2022-04-22 17:43:50 +00:00

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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, VUYA, 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 demonstrate 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"
#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, VUYA, 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 (GST_VIDEO_FORMATS_ALL))
);
static void gst_compositor_child_proxy_init (gpointer g_iface,
gpointer iface_data);
#define GST_TYPE_COMPOSITOR_OPERATOR (gst_compositor_operator_get_type())
static GType
gst_compositor_operator_get_type (void)
{
static GType compositor_operator_type = 0;
static const GEnumValue compositor_operator[] = {
{COMPOSITOR_OPERATOR_SOURCE, "Source", "source"},
{COMPOSITOR_OPERATOR_OVER, "Over", "over"},
{COMPOSITOR_OPERATOR_ADD, "Add", "add"},
{0, NULL, NULL},
};
if (!compositor_operator_type) {
compositor_operator_type =
g_enum_register_static ("GstCompositorOperator", compositor_operator);
}
return compositor_operator_type;
}
#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;
}
#define GST_TYPE_COMPOSITOR_SIZING_POLICY (gst_compositor_sizing_policy_get_type())
static GType
gst_compositor_sizing_policy_get_type (void)
{
static GType sizing_policy_type = 0;
static const GEnumValue sizing_polices[] = {
{COMPOSITOR_SIZING_POLICY_NONE,
"None: Image is scaled to fill configured destination rectangle without "
"padding or keeping the aspect ratio", "none"},
{COMPOSITOR_SIZING_POLICY_KEEP_ASPECT_RATIO,
"Keep Aspect Ratio: Image is scaled to fit destination rectangle "
"specified by GstCompositorPad:{xpos, ypos, width, height} "
"with preserved aspect ratio. Resulting image will be centered in "
"the destination rectangle with padding if necessary",
"keep-aspect-ratio"},
{0, NULL, NULL},
};
if (!sizing_policy_type) {
sizing_policy_type =
g_enum_register_static ("GstCompositorSizingPolicy", sizing_polices);
}
return sizing_policy_type;
}
#define DEFAULT_PAD_XPOS 0
#define DEFAULT_PAD_YPOS 0
#define DEFAULT_PAD_WIDTH -1
#define DEFAULT_PAD_HEIGHT -1
#define DEFAULT_PAD_ALPHA 1.0
#define DEFAULT_PAD_OPERATOR COMPOSITOR_OPERATOR_OVER
#define DEFAULT_PAD_SIZING_POLICY COMPOSITOR_SIZING_POLICY_NONE
enum
{
PROP_PAD_0,
PROP_PAD_XPOS,
PROP_PAD_YPOS,
PROP_PAD_WIDTH,
PROP_PAD_HEIGHT,
PROP_PAD_ALPHA,
PROP_PAD_OPERATOR,
PROP_PAD_SIZING_POLICY,
};
G_DEFINE_TYPE (GstCompositorPad, gst_compositor_pad,
GST_TYPE_VIDEO_AGGREGATOR_PARALLEL_CONVERT_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_OPERATOR:
g_value_set_enum (value, pad->op);
break;
case PROP_PAD_SIZING_POLICY:
g_value_set_enum (value, pad->sizing_policy);
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);
gst_video_aggregator_convert_pad_update_conversion_info
(GST_VIDEO_AGGREGATOR_CONVERT_PAD (pad));
break;
case PROP_PAD_HEIGHT:
pad->height = g_value_get_int (value);
gst_video_aggregator_convert_pad_update_conversion_info
(GST_VIDEO_AGGREGATOR_CONVERT_PAD (pad));
break;
case PROP_PAD_ALPHA:
pad->alpha = g_value_get_double (value);
break;
case PROP_PAD_OPERATOR:
pad->op = g_value_get_enum (value);
gst_video_aggregator_pad_set_needs_alpha (GST_VIDEO_AGGREGATOR_PAD (pad),
pad->op == COMPOSITOR_OPERATOR_ADD);
break;
case PROP_PAD_SIZING_POLICY:
pad->sizing_policy = g_value_get_enum (value);
gst_video_aggregator_convert_pad_update_conversion_info
(GST_VIDEO_AGGREGATOR_CONVERT_PAD (pad));
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,
gint * x_offset, gint * y_offset)
{
GstVideoAggregatorPad *vagg_pad = GST_VIDEO_AGGREGATOR_PAD (comp_pad);
gint pad_width, pad_height;
guint dar_n, dar_d;
*x_offset = 0;
*y_offset = 0;
*width = 0;
*height = 0;
/* 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");
return;
}
if (comp->zero_size_is_unscaled) {
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;
} else {
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 (pad_width == 0 || pad_height == 0)
return;
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");
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);
switch (comp_pad->sizing_policy) {
case COMPOSITOR_SIZING_POLICY_NONE:
/* Pick either height or width, whichever is an integer multiple of the
* display aspect ratio. However, prefer preserving the height to account
* for interlaced video. */
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);
}
break;
case COMPOSITOR_SIZING_POLICY_KEEP_ASPECT_RATIO:
{
gint from_dar_n, from_dar_d, to_dar_n, to_dar_d, num, den;
/* Calculate DAR again with actual video size */
if (!gst_util_fraction_multiply (GST_VIDEO_INFO_WIDTH (&vagg_pad->info),
GST_VIDEO_INFO_HEIGHT (&vagg_pad->info),
GST_VIDEO_INFO_PAR_N (&vagg_pad->info),
GST_VIDEO_INFO_PAR_D (&vagg_pad->info), &from_dar_n,
&from_dar_d)) {
from_dar_n = from_dar_d = -1;
}
if (!gst_util_fraction_multiply (pad_width, pad_height,
out_par_n, out_par_d, &to_dar_n, &to_dar_d)) {
to_dar_n = to_dar_d = -1;
}
if (from_dar_n != to_dar_n || from_dar_d != to_dar_d) {
/* Calculate new output resolution */
if (from_dar_n != -1 && from_dar_d != -1
&& gst_util_fraction_multiply (from_dar_n, from_dar_d,
out_par_d, out_par_n, &num, &den)) {
GstVideoRectangle src_rect, dst_rect, rst_rect;
src_rect.h = gst_util_uint64_scale_int (pad_width, den, num);
if (src_rect.h == 0) {
pad_width = 0;
pad_height = 0;
break;
}
src_rect.x = src_rect.y = 0;
src_rect.w = pad_width;
dst_rect.x = dst_rect.y = 0;
dst_rect.w = pad_width;
dst_rect.h = pad_height;
/* Scale rect to be centered in destination rect */
gst_video_center_rect (&src_rect, &dst_rect, &rst_rect, TRUE);
GST_LOG_OBJECT (comp_pad,
"Re-calculated size %dx%d -> %dx%d (x-offset %d, y-offset %d)",
pad_width, pad_height, rst_rect.w, rst_rect.h, rst_rect.x,
rst_rect.h);
*x_offset = rst_rect.x;
*y_offset = rst_rect.y;
pad_width = rst_rect.w;
pad_height = rst_rect.h;
} else {
GST_WARNING_OBJECT (comp_pad, "Failed to calculate output size");
*x_offset = 0;
*y_offset = 0;
pad_width = 0;
pad_height = 0;
}
}
break;
}
}
*width = pad_width;
*height = pad_height;
}
static gboolean
is_point_contained (const GstVideoRectangle rect, const gint px, const gint py)
{
if ((px >= rect.x) && (px <= rect.x + rect.w) &&
(py >= rect.y) && (py <= rect.y + rect.h))
return TRUE;
return FALSE;
}
/* Test whether rectangle2 contains rectangle 1 (geometrically) */
static gboolean
is_rectangle_contained (const GstVideoRectangle rect1,
const 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;
}
/* Call this with the lock taken */
static gboolean
_pad_obscures_rectangle (GstVideoAggregator * vagg, GstVideoAggregatorPad * pad,
const GstVideoRectangle rect)
{
GstVideoRectangle pad_rect;
GstCompositorPad *cpad = GST_COMPOSITOR_PAD (pad);
GstStructure *converter_config = NULL;
gboolean fill_border = TRUE;
guint32 border_argb = 0xff000000;
gint x_offset, y_offset;
/* No buffer to obscure the rectangle with */
if (!gst_video_aggregator_pad_has_current_buffer (pad))
return FALSE;
/* Can't obscure if we introduce alpha or if the format has an alpha
* component as we'd have to inspect every pixel to know if the frame is
* opaque, so assume it doesn't obscure
*/
if (cpad->alpha != 1.0 || GST_VIDEO_INFO_HAS_ALPHA (&pad->info))
return FALSE;
/* If a converter-config is set and it is either configured to not fill any
* borders, or configured to use a non-opaque color, then we have to handle
* the pad as potentially containing transparency */
g_object_get (pad, "converter-config", &converter_config, NULL);
if (converter_config) {
gst_structure_get (converter_config, GST_VIDEO_CONVERTER_OPT_BORDER_ARGB,
G_TYPE_UINT, &border_argb, NULL);
gst_structure_get (converter_config, GST_VIDEO_CONVERTER_OPT_FILL_BORDER,
G_TYPE_BOOLEAN, &fill_border, NULL);
}
gst_clear_structure (&converter_config);
if (!fill_border || (border_argb & 0xff000000) != 0xff000000)
return FALSE;
pad_rect.x = cpad->xpos;
pad_rect.y = cpad->ypos;
/* Handle pixel and display aspect ratios to find the actual size */
_mixer_pad_get_output_size (GST_COMPOSITOR (vagg), cpad,
GST_VIDEO_INFO_PAR_N (&vagg->info), GST_VIDEO_INFO_PAR_D (&vagg->info),
&(pad_rect.w), &(pad_rect.h), &x_offset, &y_offset);
pad_rect.x += x_offset;
pad_rect.y += y_offset;
if (!is_rectangle_contained (rect, pad_rect))
return FALSE;
GST_DEBUG_OBJECT (pad, "Pad %s %ix%i@(%i,%i) obscures rect %ix%i@(%i,%i)",
GST_PAD_NAME (pad), pad_rect.w, pad_rect.h, pad_rect.x, pad_rect.y,
rect.w, rect.h, rect.x, rect.y);
return TRUE;
}
static void
gst_compositor_pad_prepare_frame_start (GstVideoAggregatorPad * pad,
GstVideoAggregator * vagg, GstBuffer * buffer,
GstVideoFrame * prepared_frame)
{
GstCompositorPad *cpad = GST_COMPOSITOR_PAD (pad);
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 (GST_COMPOSITOR (vagg), cpad,
GST_VIDEO_INFO_PAR_N (&vagg->info), GST_VIDEO_INFO_PAR_D (&vagg->info),
&width, &height, &cpad->x_offset, &cpad->y_offset);
if (cpad->alpha == 0.0) {
GST_DEBUG_OBJECT (pad, "Pad has alpha 0.0, not converting frame");
return;
}
if (gst_aggregator_pad_is_inactive (GST_AGGREGATOR_PAD (pad)))
return;
frame_rect = clamp_rectangle (cpad->xpos + cpad->x_offset,
cpad->ypos + cpad->y_offset, 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 (pad, "Resulting frame is zero-width or zero-height "
"(w: %i, h: %i), skipping", frame_rect.w, frame_rect.h);
return;
}
GST_OBJECT_LOCK (vagg);
/* 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 */
l = g_list_find (GST_ELEMENT (vagg)->sinkpads, pad);
/* The pad might've just been removed */
if (l)
l = l->next;
for (; l; l = l->next) {
GstBuffer *pad_buffer;
pad_buffer =
gst_video_aggregator_pad_get_current_buffer (GST_VIDEO_AGGREGATOR_PAD
(l->data));
if (pad_buffer == NULL)
continue;
if (gst_buffer_get_size (pad_buffer) == 0 &&
GST_BUFFER_FLAG_IS_SET (pad_buffer, GST_BUFFER_FLAG_GAP)) {
continue;
}
if (_pad_obscures_rectangle (vagg, l->data, frame_rect)) {
frame_obscured = TRUE;
break;
}
}
GST_OBJECT_UNLOCK (vagg);
if (frame_obscured)
return;
GST_VIDEO_AGGREGATOR_PAD_CLASS
(gst_compositor_pad_parent_class)->prepare_frame_start (pad, vagg, buffer,
prepared_frame);
}
static void
gst_compositor_pad_create_conversion_info (GstVideoAggregatorConvertPad * pad,
GstVideoAggregator * vagg, GstVideoInfo * conversion_info)
{
GstCompositorPad *cpad = GST_COMPOSITOR_PAD (pad);
gint width, height;
gint x_offset, y_offset;
GST_VIDEO_AGGREGATOR_CONVERT_PAD_CLASS
(gst_compositor_pad_parent_class)->create_conversion_info (pad, vagg,
conversion_info);
if (!conversion_info->finfo)
return;
_mixer_pad_get_output_size (GST_COMPOSITOR (vagg), cpad,
GST_VIDEO_INFO_PAR_N (&vagg->info), GST_VIDEO_INFO_PAR_D (&vagg->info),
&width, &height, &x_offset, &y_offset);
/* The only thing that can change here is the width
* and height, otherwise set_info would've been called */
if (GST_VIDEO_INFO_WIDTH (conversion_info) != width ||
GST_VIDEO_INFO_HEIGHT (conversion_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 (conversion_info), width, height);
tmp_info.chroma_site = conversion_info->chroma_site;
tmp_info.colorimetry = conversion_info->colorimetry;
tmp_info.par_n = conversion_info->par_n;
tmp_info.par_d = conversion_info->par_d;
tmp_info.fps_n = conversion_info->fps_n;
tmp_info.fps_d = conversion_info->fps_d;
tmp_info.flags = conversion_info->flags;
tmp_info.interlace_mode = conversion_info->interlace_mode;
*conversion_info = tmp_info;
}
}
static void
gst_compositor_pad_class_init (GstCompositorPadClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstVideoAggregatorPadClass *vaggpadclass =
(GstVideoAggregatorPadClass *) klass;
GstVideoAggregatorConvertPadClass *vaggcpadclass =
(GstVideoAggregatorConvertPadClass *) klass;
gobject_class->set_property = gst_compositor_pad_set_property;
gobject_class->get_property = gst_compositor_pad_get_property;
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_OPERATOR,
g_param_spec_enum ("operator", "Operator",
"Blending operator to use for blending this pad over the previous ones",
GST_TYPE_COMPOSITOR_OPERATOR, DEFAULT_PAD_OPERATOR,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstCompositorPad:sizing-policy:
*
* Specifies sizing policy to use. Depending on selected sizing policy,
* scaled image might not fully cover the configured target rectangle area
* (e.g., "keep-aspect-ratio"). In that case, any uncovered area will be
* filled with background unless the uncovered area is drawn by other image.
*
* Since: 1.20
*/
g_object_class_install_property (gobject_class, PROP_PAD_SIZING_POLICY,
g_param_spec_enum ("sizing-policy", "Sizing policy",
"Sizing policy to use for image scaling",
GST_TYPE_COMPOSITOR_SIZING_POLICY, DEFAULT_PAD_SIZING_POLICY,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
vaggpadclass->prepare_frame_start =
GST_DEBUG_FUNCPTR (gst_compositor_pad_prepare_frame_start);
vaggcpadclass->create_conversion_info =
GST_DEBUG_FUNCPTR (gst_compositor_pad_create_conversion_info);
gst_type_mark_as_plugin_api (GST_TYPE_COMPOSITOR_SIZING_POLICY, 0);
}
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->op = DEFAULT_PAD_OPERATOR;
compo_pad->width = DEFAULT_PAD_WIDTH;
compo_pad->height = DEFAULT_PAD_HEIGHT;
compo_pad->sizing_policy = DEFAULT_PAD_SIZING_POLICY;
}
/* GstCompositor */
#define DEFAULT_BACKGROUND COMPOSITOR_BACKGROUND_CHECKER
#define DEFAULT_ZERO_SIZE_IS_UNSCALED TRUE
#define DEFAULT_MAX_THREADS 0
enum
{
PROP_0,
PROP_BACKGROUND,
PROP_ZERO_SIZE_IS_UNSCALED,
PROP_MAX_THREADS,
PROP_IGNORE_INACTIVE_PADS,
};
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;
case PROP_ZERO_SIZE_IS_UNSCALED:
g_value_set_boolean (value, self->zero_size_is_unscaled);
break;
case PROP_MAX_THREADS:
g_value_set_uint (value, self->max_threads);
break;
case PROP_IGNORE_INACTIVE_PADS:
g_value_set_boolean (value,
gst_aggregator_get_ignore_inactive_pads (GST_AGGREGATOR (object)));
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;
case PROP_ZERO_SIZE_IS_UNSCALED:
self->zero_size_is_unscaled = g_value_get_boolean (value);
break;
case PROP_MAX_THREADS:
self->max_threads = g_value_get_uint (value);
break;
case PROP_IGNORE_INACTIVE_PADS:
gst_aggregator_set_ignore_inactive_pads (GST_AGGREGATOR (object),
g_value_get_boolean (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));
GST_ELEMENT_REGISTER_DEFINE (compositor, "compositor", GST_RANK_PRIMARY + 1,
GST_TYPE_COMPOSITOR);
static gboolean
set_functions (GstCompositor * self, const 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_VUYA:
self->blend = gst_compositor_blend_vuya;
self->overlay = gst_compositor_overlay_vuya;
self->fill_checker = gst_compositor_fill_checker_vuya;
self->fill_color = gst_compositor_fill_color_vuya;
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;
gint x_offset;
gint y_offset;
if (gst_aggregator_pad_is_inactive (GST_AGGREGATOR_PAD (vaggpad)))
continue;
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, &x_offset, &y_offset);
if (width == 0 || height == 0)
continue;
/* {x,y}_offset represent padding size of each top and left area.
* To calculate total resolution, count bottom and right padding area
* as well here */
this_width = width + MAX (compositor_pad->xpos + 2 * x_offset, 0);
this_height = height + MAX (compositor_pad->ypos + 2 * y_offset, 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 void
gst_parallelized_task_thread_func (gpointer data)
{
GstParallelizedTaskRunner *runner = data;
gint idx;
g_mutex_lock (&runner->lock);
idx = runner->n_todo--;
g_assert (runner->n_todo >= -1);
g_mutex_unlock (&runner->lock);
g_assert (runner->func != NULL);
runner->func (runner->task_data[idx]);
}
static void
gst_parallelized_task_runner_join (GstParallelizedTaskRunner * self)
{
gboolean joined = FALSE;
while (!joined) {
g_mutex_lock (&self->lock);
if (!(joined = gst_queue_array_is_empty (self->tasks))) {
gpointer task = gst_queue_array_pop_head (self->tasks);
g_mutex_unlock (&self->lock);
gst_task_pool_join (self->pool, task);
} else {
g_mutex_unlock (&self->lock);
}
}
}
static void
gst_parallelized_task_runner_free (GstParallelizedTaskRunner * self)
{
gst_parallelized_task_runner_join (self);
gst_queue_array_free (self->tasks);
if (self->own_pool)
gst_task_pool_cleanup (self->pool);
gst_object_unref (self->pool);
g_mutex_clear (&self->lock);
g_free (self);
}
static GstParallelizedTaskRunner *
gst_parallelized_task_runner_new (guint n_threads, GstTaskPool * pool,
gboolean async_tasks)
{
GstParallelizedTaskRunner *self;
if (n_threads == 0)
n_threads = g_get_num_processors ();
self = g_new0 (GstParallelizedTaskRunner, 1);
if (pool) {
self->pool = g_object_ref (pool);
self->own_pool = FALSE;
/* No reason to split up the work between more threads than the
* pool can spawn */
if (GST_IS_SHARED_TASK_POOL (pool))
n_threads =
MIN (n_threads,
gst_shared_task_pool_get_max_threads (GST_SHARED_TASK_POOL (pool)));
} else {
self->pool = gst_shared_task_pool_new ();
self->own_pool = TRUE;
gst_shared_task_pool_set_max_threads (GST_SHARED_TASK_POOL (self->pool),
n_threads);
gst_task_pool_prepare (self->pool, NULL);
}
self->tasks = gst_queue_array_new (n_threads);
self->n_threads = n_threads;
self->n_todo = -1;
g_mutex_init (&self->lock);
/* Set when scheduling a job */
self->func = NULL;
self->task_data = NULL;
self->async_tasks = async_tasks;
return self;
}
static void
gst_parallelized_task_runner_finish (GstParallelizedTaskRunner * self)
{
g_return_if_fail (self->func != NULL);
gst_parallelized_task_runner_join (self);
self->func = NULL;
self->task_data = NULL;
}
static void
gst_parallelized_task_runner_run (GstParallelizedTaskRunner * self,
GstParallelizedTaskFunc func, gpointer * task_data)
{
guint n_threads = self->n_threads;
self->func = func;
self->task_data = task_data;
if (n_threads > 1 || self->async_tasks) {
guint i = 0;
g_mutex_lock (&self->lock);
self->n_todo = self->n_threads - 1;
if (!self->async_tasks) {
/* if not async, perform one of the functions in the current thread */
self->n_todo--;
i = 1;
}
for (; i < n_threads; i++) {
gpointer task =
gst_task_pool_push (self->pool, gst_parallelized_task_thread_func,
self, NULL);
/* The return value of push() is nullable but NULL is only returned
* with the shared task pool when gst_task_pool_prepare() has not been
* called and would thus be a programming error that we should hard-fail
* on.
*/
g_assert (task != NULL);
gst_queue_array_push_tail (self->tasks, task);
}
g_mutex_unlock (&self->lock);
}
if (!self->async_tasks) {
self->func (self->task_data[self->n_threads - 1]);
gst_parallelized_task_runner_finish (self);
}
}
static gboolean
_negotiated_caps (GstAggregator * agg, GstCaps * caps)
{
GstCompositor *compositor = GST_COMPOSITOR (agg);
GstVideoAggregator *vagg = GST_VIDEO_AGGREGATOR (agg);
GstVideoInfo v_info;
guint n_threads;
GST_DEBUG_OBJECT (agg, "Negotiated caps %" GST_PTR_FORMAT, caps);
if (!gst_video_info_from_caps (&v_info, caps))
return FALSE;
if (!set_functions (compositor, &v_info)) {
GST_ERROR_OBJECT (agg, "Failed to setup vfuncs");
return FALSE;
}
if (compositor->max_threads == 0)
n_threads = g_get_num_processors ();
else
n_threads = compositor->max_threads;
/* Magic number of 200 lines */
if (GST_VIDEO_INFO_HEIGHT (&v_info) / n_threads < 200)
n_threads = (GST_VIDEO_INFO_HEIGHT (&v_info) + 199) / 200;
if (n_threads < 1)
n_threads = 1;
/* XXX: implement better thread count change */
if (compositor->blend_runner
&& compositor->blend_runner->n_threads != n_threads) {
gst_parallelized_task_runner_free (compositor->blend_runner);
compositor->blend_runner = NULL;
}
if (!compositor->blend_runner) {
GstTaskPool *pool = gst_video_aggregator_get_execution_task_pool (vagg);
compositor->blend_runner =
gst_parallelized_task_runner_new (n_threads, pool, FALSE);
gst_clear_object (&pool);
}
return GST_AGGREGATOR_CLASS (parent_class)->negotiated_src_caps (agg, caps);
}
static gboolean
_should_draw_background (GstVideoAggregator * vagg)
{
GstVideoRectangle bg_rect;
gboolean draw = TRUE;
GList *l;
bg_rect.x = bg_rect.y = 0;
GST_OBJECT_LOCK (vagg);
bg_rect.w = GST_VIDEO_INFO_WIDTH (&vagg->info);
bg_rect.h = GST_VIDEO_INFO_HEIGHT (&vagg->info);
/* Check if the background is completely obscured by a pad
* TODO: Also skip if it's obscured by a combination of pads */
for (l = GST_ELEMENT (vagg)->sinkpads; l; l = l->next) {
if (gst_aggregator_pad_is_inactive (GST_AGGREGATOR_PAD (l->data))
||
gst_video_aggregator_pad_get_prepared_frame (GST_VIDEO_AGGREGATOR_PAD
(l->data)) == NULL)
continue;
if (_pad_obscures_rectangle (vagg, l->data, bg_rect)) {
draw = FALSE;
break;
}
}
GST_OBJECT_UNLOCK (vagg);
return draw;
}
static gboolean
frames_can_copy (const GstVideoFrame * frame1, const GstVideoFrame * frame2)
{
if (GST_VIDEO_FRAME_FORMAT (frame1) != GST_VIDEO_FRAME_FORMAT (frame2))
return FALSE;
if (GST_VIDEO_FRAME_HEIGHT (frame1) != GST_VIDEO_FRAME_HEIGHT (frame2))
return FALSE;
if (GST_VIDEO_FRAME_WIDTH (frame1) != GST_VIDEO_FRAME_WIDTH (frame2))
return FALSE;
return TRUE;
}
struct CompositePadInfo
{
GstVideoFrame *prepared_frame;
GstCompositorPad *pad;
GstCompositorBlendMode blend_mode;
};
struct CompositeTask
{
GstCompositor *compositor;
GstVideoFrame *out_frame;
guint dst_line_start;
guint dst_line_end;
gboolean draw_background;
guint n_pads;
struct CompositePadInfo *pads_info;
};
static void
_draw_background (GstCompositor * comp, GstVideoFrame * outframe,
guint y_start, guint y_end, BlendFunction * composite)
{
*composite = comp->blend;
switch (comp->background) {
case COMPOSITOR_BACKGROUND_CHECKER:
comp->fill_checker (outframe, y_start, y_end);
break;
case COMPOSITOR_BACKGROUND_BLACK:
comp->fill_color (outframe, y_start, y_end, 16, 128, 128);
break;
case COMPOSITOR_BACKGROUND_WHITE:
comp->fill_color (outframe, y_start, y_end, 240, 128, 128);
break;
case COMPOSITOR_BACKGROUND_TRANSPARENT:
{
guint i, plane, num_planes, height;
num_planes = GST_VIDEO_FRAME_N_PLANES (outframe);
for (plane = 0; plane < num_planes; ++plane) {
const GstVideoFormatInfo *info;
gint comp[GST_VIDEO_MAX_COMPONENTS];
guint8 *pdata;
gsize rowsize, plane_stride;
gint yoffset;
info = outframe->info.finfo;
pdata = GST_VIDEO_FRAME_PLANE_DATA (outframe, plane);
plane_stride = GST_VIDEO_FRAME_PLANE_STRIDE (outframe, plane);
gst_video_format_info_component (info, plane, comp);
rowsize = GST_VIDEO_FRAME_COMP_WIDTH (outframe, comp[0])
* GST_VIDEO_FRAME_COMP_PSTRIDE (outframe, comp[0]);
height = GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (info, comp[0],
(y_end - y_start));
yoffset = GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (info, comp[0], y_start);
pdata += yoffset * plane_stride;
for (i = 0; i < height; ++i) {
memset (pdata, 0, rowsize);
pdata += plane_stride;
}
}
/* use overlay to keep background transparent */
*composite = comp->overlay;
break;
}
}
}
static void
blend_pads (struct CompositeTask *comp)
{
BlendFunction composite;
guint i;
composite = comp->compositor->blend;
if (comp->draw_background) {
_draw_background (comp->compositor, comp->out_frame, comp->dst_line_start,
comp->dst_line_end, &composite);
}
for (i = 0; i < comp->n_pads; i++) {
composite (comp->pads_info[i].prepared_frame,
comp->pads_info[i].pad->xpos + comp->pads_info[i].pad->x_offset,
comp->pads_info[i].pad->ypos + comp->pads_info[i].pad->y_offset,
comp->pads_info[i].pad->alpha, comp->out_frame, comp->dst_line_start,
comp->dst_line_end, comp->pads_info[i].blend_mode);
}
}
static GstFlowReturn
gst_compositor_aggregate_frames (GstVideoAggregator * vagg, GstBuffer * outbuf)
{
GstCompositor *compositor = GST_COMPOSITOR (vagg);
GList *l;
GstVideoFrame out_frame, *outframe;
gboolean draw_background;
guint drawn_a_pad = FALSE;
struct CompositePadInfo *pads_info;
guint i, n_pads = 0;
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;
/* If one of the frames to be composited completely obscures the background,
* don't bother drawing the background at all. We can also always use the
* 'blend' BlendFunction in that case because it only changes if we have to
* overlay on top of a transparent background. */
draw_background = _should_draw_background (vagg);
GST_OBJECT_LOCK (vagg);
for (l = GST_ELEMENT (vagg)->sinkpads; l; l = l->next) {
GstVideoAggregatorPad *pad = l->data;
GstVideoFrame *prepared_frame =
gst_video_aggregator_pad_get_prepared_frame (pad);
if (prepared_frame)
n_pads++;
}
/* If no prepared frame, we should draw background unconditionally in order
* to clear output buffer */
if (n_pads == 0)
draw_background = TRUE;
pads_info = g_newa (struct CompositePadInfo, n_pads);
n_pads = 0;
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);
GstCompositorBlendMode blend_mode = COMPOSITOR_BLEND_MODE_OVER;
switch (compo_pad->op) {
case COMPOSITOR_OPERATOR_SOURCE:
blend_mode = COMPOSITOR_BLEND_MODE_SOURCE;
break;
case COMPOSITOR_OPERATOR_OVER:
blend_mode = COMPOSITOR_BLEND_MODE_OVER;
break;
case COMPOSITOR_OPERATOR_ADD:
blend_mode = COMPOSITOR_BLEND_MODE_ADD;
break;
default:
g_assert_not_reached ();
break;
}
if (prepared_frame != NULL) {
/* If this is the first pad we're drawing, and we didn't draw the
* background, and @prepared_frame has the same format, height, and width
* as @outframe, then we can just copy it as-is. Subsequent pads (if any)
* will be composited on top of it. */
if (!drawn_a_pad && !draw_background &&
frames_can_copy (prepared_frame, outframe)) {
gst_video_frame_copy (outframe, prepared_frame);
} else {
pads_info[n_pads].pad = compo_pad;
pads_info[n_pads].prepared_frame = prepared_frame;
pads_info[n_pads].blend_mode = blend_mode;
n_pads++;
}
drawn_a_pad = TRUE;
}
}
{
guint n_threads, lines_per_thread;
guint out_height;
struct CompositeTask *tasks;
struct CompositeTask **tasks_p;
n_threads = compositor->blend_runner->n_threads;
tasks = g_newa (struct CompositeTask, n_threads);
tasks_p = g_newa (struct CompositeTask *, n_threads);
out_height = GST_VIDEO_FRAME_HEIGHT (outframe);
lines_per_thread = (out_height + n_threads - 1) / n_threads;
for (i = 0; i < n_threads; i++) {
tasks[i].compositor = compositor;
tasks[i].n_pads = n_pads;
tasks[i].pads_info = pads_info;
tasks[i].out_frame = outframe;
tasks[i].draw_background = draw_background;
/* This is a dumb split of the work by number of output lines.
* If there is a section of the output that reads from a lot of source
* pads, then that thread will consume more time. Maybe tracking and
* splitting on the source fill rate would produce better results. */
tasks[i].dst_line_start = i * lines_per_thread;
tasks[i].dst_line_end = MIN ((i + 1) * lines_per_thread, out_height);
tasks_p[i] = &tasks[i];
}
gst_parallelized_task_runner_run (compositor->blend_runner,
(GstParallelizedTaskFunc) blend_pads, (gpointer *) tasks_p);
}
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
src_pad_mouse_event (GstElement * element, GstPad * pad, gpointer user_data)
{
GstVideoAggregator *vagg = GST_VIDEO_AGGREGATOR_CAST (element);
GstCompositor *comp = GST_COMPOSITOR (element);
GstCompositorPad *cpad = GST_COMPOSITOR_PAD (pad);
GstStructure *st =
gst_structure_copy (gst_event_get_structure (GST_EVENT_CAST (user_data)));
gdouble event_x, event_y;
gint offset_x, offset_y;
GstVideoRectangle rect;
gst_structure_get (st, "pointer_x", G_TYPE_DOUBLE, &event_x,
"pointer_y", G_TYPE_DOUBLE, &event_y, NULL);
/* Find output rectangle of this pad */
_mixer_pad_get_output_size (comp, cpad,
GST_VIDEO_INFO_PAR_N (&vagg->info),
GST_VIDEO_INFO_PAR_D (&vagg->info),
&(rect.w), &(rect.h), &offset_x, &offset_y);
rect.x = cpad->xpos + offset_x;
rect.y = cpad->ypos + offset_y;
/* Translate coordinates and send event if it lies in this rectangle */
if (is_point_contained (rect, event_x, event_y)) {
GstVideoAggregatorPad *vpad = GST_VIDEO_AGGREGATOR_PAD_CAST (cpad);
gdouble w, h, x, y;
w = (gdouble) GST_VIDEO_INFO_WIDTH (&vpad->info);
h = (gdouble) GST_VIDEO_INFO_HEIGHT (&vpad->info);
x = (event_x - (gdouble) rect.x) * (w / (gdouble) rect.w);
y = (event_y - (gdouble) rect.y) * (h / (gdouble) rect.h);
gst_structure_set (st, "pointer_x", G_TYPE_DOUBLE, x,
"pointer_y", G_TYPE_DOUBLE, y, NULL);
gst_pad_push_event (pad, gst_event_new_navigation (st));
} else {
gst_structure_free (st);
}
return TRUE;
}
static gboolean
_src_event (GstAggregator * agg, GstEvent * event)
{
GstNavigationEventType event_type;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NAVIGATION:
{
event_type = gst_navigation_event_get_type (event);
switch (event_type) {
case GST_NAVIGATION_EVENT_MOUSE_BUTTON_PRESS:
case GST_NAVIGATION_EVENT_MOUSE_BUTTON_RELEASE:
case GST_NAVIGATION_EVENT_MOUSE_MOVE:
case GST_NAVIGATION_EVENT_MOUSE_SCROLL:
gst_element_foreach_sink_pad (GST_ELEMENT_CAST (agg),
src_pad_mouse_event, event);
gst_event_unref (event);
return TRUE;
default:
break;
}
}
default:
break;
}
return GST_AGGREGATOR_CLASS (parent_class)->src_event (agg, event);
}
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);
}
}
static void
gst_compositor_finalize (GObject * object)
{
GstCompositor *compositor = GST_COMPOSITOR (object);
if (compositor->blend_runner)
gst_parallelized_task_runner_free (compositor->blend_runner);
compositor->blend_runner = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/* 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;
gobject_class->finalize = gst_compositor_finalize;
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->src_event = _src_event;
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));
/**
* compositor:zero-size-is-unscaled:
*
* Whether a pad with height or width 0 should be left unscaled
* in that dimension, or simply not composited in. Setting it to
* %FALSE might be useful when animating those properties.
*
* Since: 1.20
*/
g_object_class_install_property (gobject_class, PROP_ZERO_SIZE_IS_UNSCALED,
g_param_spec_boolean ("zero-size-is-unscaled", "Zero size is unscaled",
"If TRUE, then input video is unscaled in that dimension "
"if width or height is 0 (for backwards compatibility)",
DEFAULT_ZERO_SIZE_IS_UNSCALED,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* compositor:max-threads:
*
* Maximum number of blending/rendering worker threads to spawn (0 = auto)
*
* Since: 1.20
*/
g_object_class_install_property (gobject_class, PROP_MAX_THREADS,
g_param_spec_uint ("max-threads", "Max Threads",
"Maximum number of blending/rendering worker threads to spawn "
"(0 = auto)", 0, G_MAXINT, DEFAULT_MAX_THREADS,
GST_PARAM_MUTABLE_READY | 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>");
/**
* compositor:ignore-inactive-pads:
*
* Don't wait for inactive pads when live. An inactive pad
* is a pad that hasn't yet received a buffer, but that has
* been waited on at least once.
*
* The purpose of this property is to avoid aggregating on
* timeout when new pads are requested in advance of receiving
* data flow, for example the user may decide to connect it later,
* but wants to configure it already.
*
* Since: 1.20
*/
g_object_class_install_property (gobject_class,
PROP_IGNORE_INACTIVE_PADS, g_param_spec_boolean ("ignore-inactive-pads",
"Ignore inactive pads",
"Avoid timing out waiting for inactive pads", FALSE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_type_mark_as_plugin_api (GST_TYPE_COMPOSITOR_PAD, 0);
gst_type_mark_as_plugin_api (GST_TYPE_COMPOSITOR_OPERATOR, 0);
gst_type_mark_as_plugin_api (GST_TYPE_COMPOSITOR_BACKGROUND, 0);
}
static void
gst_compositor_init (GstCompositor * self)
{
/* initialize variables */
self->background = DEFAULT_BACKGROUND;
self->zero_size_is_unscaled = DEFAULT_ZERO_SIZE_IS_UNSCALED;
self->max_threads = DEFAULT_MAX_THREADS;
}
/* 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 (compositor, plugin);
}
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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