gstreamer/ext/gl/gstgloverlaycompositorelement.c
Matthew Waters f960beaa98 gl: add a new overlay compositor element
Flattens all the overlays from the GstVideoOverlayCompositionMeta into
the video stream.

https://bugzilla.gnome.org/show_bug.cgi?id=759867
2018-10-04 14:28:35 +10:00

343 lines
11 KiB
C

/*
* gloverlaycompositor element
* Copyrithg (C) 2018 Matthew Waters <matthew@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-glcompositoroverlay
* @title: glcompositoroverlay
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gl/gstglfuncs.h>
#include <gst/video/video.h>
#include "gstgloverlaycompositorelement.h"
enum
{
PROP_0,
PROP_LAST,
};
#define GST_CAT_DEFAULT gst_gl_overlay_compositor_element_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
#define DEBUG_INIT \
GST_DEBUG_CATEGORY_INIT (gst_gl_overlay_compositor_element_debug, "gloverlaycompositorelement", 0, "gloverlaycompositor element");
#define gst_gl_overlay_compositor_element_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstGLOverlayCompositorElement,
gst_gl_overlay_compositor_element, GST_TYPE_GL_FILTER, DEBUG_INIT);
static GstStaticPadTemplate overlay_sink_pad_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE_WITH_FEATURES
(GST_CAPS_FEATURE_MEMORY_GL_MEMORY ","
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION,
"RGBA") ", texture-target=(string) { 2D, rectangle } ; "
GST_VIDEO_CAPS_MAKE_WITH_FEATURES (GST_CAPS_FEATURE_MEMORY_GL_MEMORY,
"RGBA") ", texture-target=(string) { 2D, rectangle } ; "
GST_VIDEO_CAPS_MAKE_WITH_FEATURES ("ANY",
"RGBA") ", texture-target=(string) { 2D, rectangle } "));
static GstStaticPadTemplate overlay_src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE_WITH_FEATURES
(GST_CAPS_FEATURE_MEMORY_GL_MEMORY ","
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION,
"RGBA") ", texture-target=(string) { 2D, rectangle } ; "
GST_VIDEO_CAPS_MAKE_WITH_FEATURES (GST_CAPS_FEATURE_MEMORY_GL_MEMORY,
"RGBA") ", texture-target=(string) { 2D, rectangle } ; "
GST_VIDEO_CAPS_MAKE_WITH_FEATURES ("ANY",
"RGBA") ", texture-target=(string) { 2D, rectangle } "));
static gboolean
gst_gl_overlay_compositor_element_propose_allocation (GstBaseTransform * trans,
GstQuery * decide_query, GstQuery * query);
static GstFlowReturn _oce_prepare_output_buffer (GstBaseTransform * bt,
GstBuffer * buffer, GstBuffer ** outbuf);
static gboolean gst_gl_overlay_compositor_element_gl_start (GstGLBaseFilter *
base);
static void gst_gl_overlay_compositor_element_gl_stop (GstGLBaseFilter * base);
static GstCaps *_oce_transform_internal_caps (GstGLFilter *
filter, GstPadDirection direction, GstCaps * caps, GstCaps * filter_caps);
static gboolean gst_gl_overlay_compositor_element_filter (GstGLFilter * filter,
GstBuffer * inbuf, GstBuffer * outbuf);
static gboolean gst_gl_overlay_compositor_element_filter_texture (GstGLFilter *
filter, GstGLMemory * in_tex, GstGLMemory * out_tex);
static gboolean gst_gl_overlay_compositor_element_callback (GstGLFilter *
filter, GstGLMemory * in_tex, gpointer stuff);
static void
gst_gl_overlay_compositor_element_class_init (GstGLOverlayCompositorElementClass
* klass)
{
GstElementClass *element_class;
element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_set_metadata (element_class,
"OpenGL overlaying filter", "Filter/Effect",
"Flatten a stream containing GstVideoOverlayCompositionMeta",
"<matthew@centricular.com>");
gst_element_class_add_static_pad_template (element_class,
&overlay_src_pad_template);
gst_element_class_add_static_pad_template (element_class,
&overlay_sink_pad_template);
GST_BASE_TRANSFORM_CLASS (klass)->passthrough_on_same_caps = TRUE;
GST_BASE_TRANSFORM_CLASS (klass)->propose_allocation =
gst_gl_overlay_compositor_element_propose_allocation;
GST_BASE_TRANSFORM_CLASS (klass)->prepare_output_buffer =
_oce_prepare_output_buffer;
GST_GL_FILTER_CLASS (klass)->filter =
gst_gl_overlay_compositor_element_filter;
GST_GL_FILTER_CLASS (klass)->filter_texture =
gst_gl_overlay_compositor_element_filter_texture;
GST_GL_FILTER_CLASS (klass)->transform_internal_caps =
_oce_transform_internal_caps;
GST_GL_BASE_FILTER_CLASS (klass)->gl_start =
gst_gl_overlay_compositor_element_gl_start;
GST_GL_BASE_FILTER_CLASS (klass)->gl_stop =
gst_gl_overlay_compositor_element_gl_stop;
GST_GL_BASE_FILTER_CLASS (klass)->supported_gl_api =
GST_GL_API_OPENGL | GST_GL_API_GLES2 | GST_GL_API_OPENGL3;
}
static void
gst_gl_overlay_compositor_element_init (GstGLOverlayCompositorElement *
overlay_compositor_element)
{
}
static GstCaps *
_oce_transform_internal_caps (GstGLFilter * filter,
GstPadDirection direction, GstCaps * caps, GstCaps * filter_caps)
{
GstCaps *ret;
/* add/remove the composition overlay meta as necessary */
if (direction == GST_PAD_SRC) {
ret = gst_gl_overlay_compositor_add_caps (gst_caps_copy (caps));
} else {
guint i, n;
GstCaps *removed;
ret = gst_caps_copy (caps);
removed = gst_caps_copy (caps);
n = gst_caps_get_size (removed);
for (i = 0; i < n; i++) {
GstCapsFeatures *feat = gst_caps_get_features (removed, i);
if (feat) {
feat = gst_caps_features_copy (feat);
if (gst_caps_features_contains (feat,
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION)) {
/* prefer the passthrough case */
gst_caps_features_remove (feat,
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION);
gst_caps_set_features (removed, i, feat);
}
}
}
ret = gst_caps_merge (ret, removed);
}
GST_DEBUG_OBJECT (filter, "meta modifications returned caps %" GST_PTR_FORMAT,
ret);
return ret;
}
static gboolean
gst_gl_overlay_compositor_element_propose_allocation (GstBaseTransform * trans,
GstQuery * decide_query, GstQuery * query)
{
GstStructure *allocation_meta = NULL;
guint width = 0, height = 0;
if (!GST_BASE_TRANSFORM_CLASS (parent_class)->propose_allocation (trans,
decide_query, query))
return FALSE;
if ((width == 0 || height == 0) && decide_query) {
GstCaps *decide_caps;
gst_query_parse_allocation (decide_query, &decide_caps, NULL);
if (decide_caps) {
GstVideoInfo vinfo;
if (gst_video_info_from_caps (&vinfo, decide_caps)) {
width = GST_VIDEO_INFO_WIDTH (&vinfo);
height = GST_VIDEO_INFO_HEIGHT (&vinfo);
}
}
}
if ((width == 0 || height == 0) && query) {
GstCaps *caps;
gst_query_parse_allocation (decide_query, &caps, NULL);
if (caps) {
GstVideoInfo vinfo;
if (gst_video_info_from_caps (&vinfo, caps)) {
width = GST_VIDEO_INFO_WIDTH (&vinfo);
height = GST_VIDEO_INFO_HEIGHT (&vinfo);
}
}
}
if (width != 0 && height != 0) {
allocation_meta =
gst_structure_new ("GstVideoOverlayCompositionMeta",
"width", G_TYPE_UINT, width, "height", G_TYPE_UINT, height, NULL);
}
GST_DEBUG_OBJECT (trans, "Adding overlay composition meta with size %ux%u",
width, height);
gst_query_add_allocation_meta (query,
GST_VIDEO_OVERLAY_COMPOSITION_META_API_TYPE, allocation_meta);
return TRUE;
}
static void
gst_gl_overlay_compositor_element_gl_stop (GstGLBaseFilter * base)
{
GstGLOverlayCompositorElement *self =
GST_GL_OVERLAY_COMPOSITOR_ELEMENT (base);
if (self->shader)
gst_object_unref (self->shader);
self->shader = NULL;
if (self->overlay_compositor) {
gst_gl_overlay_compositor_free_overlays (self->overlay_compositor);
gst_object_unref (self->overlay_compositor);
}
self->overlay_compositor = NULL;
GST_GL_BASE_FILTER_CLASS (parent_class)->gl_stop (base);
}
static gboolean
gst_gl_overlay_compositor_element_gl_start (GstGLBaseFilter * base)
{
GstGLOverlayCompositorElement *self =
GST_GL_OVERLAY_COMPOSITOR_ELEMENT (base);
GError *error = NULL;
self->overlay_compositor = gst_gl_overlay_compositor_new (base->context);
g_object_set (self->overlay_compositor, "yinvert", TRUE, NULL);
if (!(self->shader = gst_gl_shader_new_default (base->context, &error))) {
GST_ELEMENT_ERROR (base, RESOURCE, NOT_FOUND, ("%s",
"Failed to compile identity shader"), ("%s", error->message));
return FALSE;
}
return GST_GL_BASE_FILTER_CLASS (parent_class)->gl_start (base);
}
static GstFlowReturn
_oce_prepare_output_buffer (GstBaseTransform * bt,
GstBuffer * buffer, GstBuffer ** outbuf)
{
GstGLOverlayCompositorElement *self = GST_GL_OVERLAY_COMPOSITOR_ELEMENT (bt);
GstVideoOverlayCompositionMeta *comp_meta;
if (gst_base_transform_is_passthrough (bt))
goto passthrough;
if (!self->overlay_compositor)
return GST_FLOW_NOT_NEGOTIATED;
comp_meta = gst_buffer_get_video_overlay_composition_meta (buffer);
if (!comp_meta)
goto passthrough;
if (gst_video_overlay_composition_n_rectangles (comp_meta->overlay) == 0)
goto passthrough;
return GST_BASE_TRANSFORM_CLASS (parent_class)->prepare_output_buffer (bt,
buffer, outbuf);
passthrough:
GST_LOG_OBJECT (bt, "passthrough detected, forwarding input buffer");
*outbuf = buffer;
return GST_FLOW_OK;
}
static gboolean
gst_gl_overlay_compositor_element_filter (GstGLFilter * filter,
GstBuffer * inbuf, GstBuffer * outbuf)
{
GstGLOverlayCompositorElement *self =
GST_GL_OVERLAY_COMPOSITOR_ELEMENT (filter);
if (inbuf == outbuf)
return TRUE;
gst_gl_overlay_compositor_upload_overlays (self->overlay_compositor, inbuf);
return gst_gl_filter_filter_texture (filter, inbuf, outbuf);
}
static gboolean
gst_gl_overlay_compositor_element_filter_texture (GstGLFilter * filter,
GstGLMemory * in_tex, GstGLMemory * out_tex)
{
GstGLOverlayCompositorElement *self =
GST_GL_OVERLAY_COMPOSITOR_ELEMENT (filter);
gst_gl_filter_render_to_target_with_shader (filter, in_tex, out_tex,
self->shader);
gst_gl_filter_render_to_target (filter, NULL, out_tex,
gst_gl_overlay_compositor_element_callback, NULL);
return TRUE;
}
static gboolean
gst_gl_overlay_compositor_element_callback (GstGLFilter * filter,
GstGLMemory * in_tex, gpointer stuff)
{
GstGLOverlayCompositorElement *self =
GST_GL_OVERLAY_COMPOSITOR_ELEMENT (filter);
GST_LOG_OBJECT (self, "drawing overlays");
gst_gl_overlay_compositor_draw_overlays (self->overlay_compositor);
return TRUE;
}