gstreamer/subprojects/gst-plugins-good/ext/qt6/gstqml6glsrc.cc

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/*
* GStreamer
* Copyright (C) 2016 Freescale Semiconductor, Inc. All rights reserved.
* Copyright (C) 2022 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-qml6glsrc
*
* A video src that captures a window from a QML view.
*
* Since: 1.24
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstqt6elements.h"
#include "gstqml6glsrc.h"
#include <QtGui/QGuiApplication>
#define GST_CAT_DEFAULT gst_debug_qml6_gl_src
GST_DEBUG_CATEGORY (GST_CAT_DEFAULT);
#define DEFAULT_IS_LIVE TRUE
static void gst_qml6_gl_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_qml6_gl_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_qml6_gl_src_finalize (GObject * object);
static gboolean gst_qml6_gl_src_setcaps (GstBaseSrc * bsrc, GstCaps * caps);
static GstCaps *gst_qml6_gl_src_get_caps (GstBaseSrc * bsrc, GstCaps * filter);
static gboolean gst_qml6_gl_src_query (GstBaseSrc * bsrc, GstQuery * query);
static gboolean gst_qml6_gl_src_decide_allocation (GstBaseSrc * bsrc,
GstQuery * query);
static GstFlowReturn gst_qml6_gl_src_create (GstPushSrc * psrc, GstBuffer ** buffer);
static gboolean gst_qml6_gl_src_unlock(GstBaseSrc * bsrc);
static gboolean gst_qml6_gl_src_unlock_stop (GstBaseSrc * bsrc);
static GstStateChangeReturn gst_qml6_gl_src_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_qml6_gl_src_start (GstBaseSrc * basesrc);
static gboolean gst_qml6_gl_src_stop (GstBaseSrc * basesrc);
static GstStaticPadTemplate gst_qml6_gl_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw(" GST_CAPS_FEATURE_MEMORY_GL_MEMORY "), "
"format = (string) RGBA, "
"width = " GST_VIDEO_SIZE_RANGE ", "
"height = " GST_VIDEO_SIZE_RANGE ", "
"framerate = " GST_VIDEO_FPS_RANGE ", "
"texture-target = (string) 2D"));
enum
{
ARG_0,
PROP_WINDOW,
PROP_DEFAULT_FBO
};
#define gst_qml6_gl_src_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstQml6GLSrc, gst_qml6_gl_src,
GST_TYPE_PUSH_SRC, GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT,
"qml6glsrc", 0, "Qt6 Qml Video Src"));
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (qml6glsrc, "qml6glsrc",
GST_RANK_NONE, GST_TYPE_QML6_GL_SRC, qt6_element_init (plugin));
static const gfloat vertical_flip_matrix[] = {
1.0f, 0.0f, 0.0f, 0.0f,
0.0f, -1.0f, 0.0f, 0.0f,
0.0f, 0.0f, 1.0f, 0.0f,
0.0f, 1.0f, 0.0f, 1.0f,
};
static void
gst_qml6_gl_src_class_init (GstQml6GLSrcClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
GstBaseSrcClass *gstbasesrc_class = (GstBaseSrcClass *) klass;
GstPushSrcClass *gstpushsrc_class = (GstPushSrcClass *) klass;
gobject_class->set_property = gst_qml6_gl_src_set_property;
gobject_class->get_property = gst_qml6_gl_src_get_property;
gobject_class->finalize = gst_qml6_gl_src_finalize;
gst_element_class_set_metadata (gstelement_class, "Qt Video Source",
"Source/Video", "A video src that captures a window from a QML view",
"Multimedia Team <shmmmw@freescale.com>");
g_object_class_install_property (gobject_class, PROP_WINDOW,
g_param_spec_pointer ("window", "QQuickWindow",
"The QQuickWindow to place in the object hierarchy",
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_DEFAULT_FBO,
g_param_spec_boolean ("use-default-fbo",
"Whether to use default FBO",
"When set it will not create a new FBO for the QML render thread",
FALSE, (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_qml6_gl_src_template));
gstelement_class->change_state = gst_qml6_gl_src_change_state;
gstbasesrc_class->set_caps = gst_qml6_gl_src_setcaps;
gstbasesrc_class->get_caps = gst_qml6_gl_src_get_caps;
gstbasesrc_class->query = gst_qml6_gl_src_query;
gstbasesrc_class->start = gst_qml6_gl_src_start;
gstbasesrc_class->stop = gst_qml6_gl_src_stop;
gstbasesrc_class->decide_allocation = gst_qml6_gl_src_decide_allocation;
gstbasesrc_class->unlock = gst_qml6_gl_src_unlock;
gstbasesrc_class->unlock_stop = gst_qml6_gl_src_unlock_stop;
gstpushsrc_class->create = gst_qml6_gl_src_create;
}
static void
gst_qml6_gl_src_init (GstQml6GLSrc * src)
{
gst_base_src_set_format (GST_BASE_SRC (src), GST_FORMAT_TIME);
gst_base_src_set_live (GST_BASE_SRC (src), DEFAULT_IS_LIVE);
src->default_fbo = FALSE;
src->pending_image_orientation = TRUE;
}
static void
gst_qml6_gl_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstQml6GLSrc *qt_src = GST_QML6_GL_SRC (object);
switch (prop_id) {
case PROP_WINDOW:{
qt_src->qwindow =
static_cast < QQuickWindow * >(g_value_get_pointer (value));
if (qt_src->window) {
delete qt_src->window;
qt_src->window = NULL;
}
if (qt_src->qwindow)
qt_src->window = new Qt6GLWindow (NULL, qt_src->qwindow);
break;
}
case PROP_DEFAULT_FBO:
qt_src->default_fbo = g_value_get_boolean (value);
if (qt_src->window)
qt6_gl_window_use_default_fbo (qt_src->window, qt_src->default_fbo);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_qml6_gl_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstQml6GLSrc *qt_src = GST_QML6_GL_SRC (object);
switch (prop_id) {
case PROP_WINDOW:
g_value_set_pointer (value, qt_src->qwindow);
break;
case PROP_DEFAULT_FBO:
g_value_set_boolean (value, qt_src->default_fbo);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_qml6_gl_src_finalize (GObject * object)
{
GstQml6GLSrc *qt_src = GST_QML6_GL_SRC (object);
GST_DEBUG ("qmlglsrc finalize");
if (qt_src->context)
gst_object_unref (qt_src->context);
qt_src->context = NULL;
if (qt_src->qt_context)
gst_object_unref (qt_src->qt_context);
qt_src->qt_context = NULL;
if (qt_src->display)
gst_object_unref (qt_src->display);
qt_src->display = NULL;
if (qt_src->window)
delete qt_src->window;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_qml6_gl_src_setcaps (GstBaseSrc * bsrc, GstCaps * caps)
{
GstQml6GLSrc *qt_src = GST_QML6_GL_SRC (bsrc);
GST_DEBUG ("set caps with %" GST_PTR_FORMAT, caps);
if (!gst_video_info_from_caps (&qt_src->v_info, caps))
return FALSE;
return TRUE;
}
static GstCaps *
gst_qml6_gl_src_get_caps (GstBaseSrc * bsrc, GstCaps * filter)
{
GstCaps *caps = NULL, *temp = NULL;
GstPadTemplate *pad_template;
GstBaseSrcClass *bclass = GST_BASE_SRC_GET_CLASS (bsrc);
GstQml6GLSrc *qt_src = GST_QML6_GL_SRC (bsrc);
guint i;
gint width, height;
if (qt_src->window) {
qt_src->window->getGeometry (&width, &height);
}
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
if (pad_template != NULL)
caps = gst_pad_template_get_caps (pad_template);
if (qt_src->window) {
temp = gst_caps_copy (caps);
guint n_caps = gst_caps_get_size (caps);
for (i = 0; i < n_caps; i++) {
GstStructure *s = gst_caps_get_structure (temp, i);
gst_structure_set (s, "width", G_TYPE_INT, width, NULL);
gst_structure_set (s, "height", G_TYPE_INT, height, NULL);
/* because the framerate is unknown */
gst_structure_set (s, "framerate", GST_TYPE_FRACTION, 0, 1, NULL);
gst_structure_set (s, "pixel-aspect-ratio",
GST_TYPE_FRACTION, 1, 1, NULL);
}
gst_caps_unref (caps);
caps = temp;
}
if (filter) {
GstCaps *intersection;
intersection =
gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
caps = intersection;
}
return caps;
}
static gboolean
gst_qml6_gl_src_query (GstBaseSrc * bsrc, GstQuery * query)
{
GstQml6GLSrc *qt_src = GST_QML6_GL_SRC (bsrc);
gboolean res = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CONTEXT:
{
if (!qt6_gl_window_is_scenegraph_initialized (qt_src->window))
return FALSE;
if (!qt_src->display && !qt_src->qt_context) {
if (!qt_src->display)
qt_src->display = qt6_gl_window_get_display (qt_src->window);
if (!qt_src->qt_context)
qt_src->qt_context = qt6_gl_window_get_qt_context (qt_src->window);
if (!qt_src->context)
qt_src->context = qt6_gl_window_get_context (qt_src->window);
}
if (gst_gl_handle_context_query ((GstElement *) qt_src, query,
qt_src->display, qt_src->context, qt_src->qt_context))
return TRUE;
/* fallthrough */
}
default:
res = GST_BASE_SRC_CLASS (parent_class)->query (bsrc, query);
break;
}
return res;
}
static gboolean
_find_local_gl_context (GstQml6GLSrc * qt_src)
{
if (gst_gl_query_local_gl_context (GST_ELEMENT (qt_src), GST_PAD_SRC,
&qt_src->context))
return TRUE;
return FALSE;
}
static gboolean
gst_qml6_gl_src_decide_allocation (GstBaseSrc * bsrc, GstQuery * query)
{
GstBufferPool *pool = NULL;
GstStructure *config;
GstCaps *caps;
guint min, max, size, n, i;
gboolean update_pool, update_allocator;
GstAllocator *allocator;
GstAllocationParams params;
GstGLVideoAllocationParams *glparams;
GstVideoInfo vinfo;
GstQml6GLSrc *qt_src = GST_QML6_GL_SRC (bsrc);
if (gst_query_find_allocation_meta (query,
GST_VIDEO_AFFINE_TRANSFORMATION_META_API_TYPE, NULL)) {
qt_src->downstream_supports_affine_meta = TRUE;
} else {
qt_src->downstream_supports_affine_meta = FALSE;
}
gst_query_parse_allocation (query, &caps, NULL);
if (!caps)
return FALSE;
gst_video_info_from_caps (&vinfo, caps);
n = gst_query_get_n_allocation_pools (query);
if (n > 0) {
update_pool = TRUE;
for (i = 0; i < n; i++) {
gst_query_parse_nth_allocation_pool (query, i, &pool, &size, &min, &max);
if (!pool || !GST_IS_GL_BUFFER_POOL (pool)) {
if (pool)
gst_object_unref (pool);
pool = NULL;
}
}
}
if (!pool) {
size = vinfo.size;
min = max = 0;
update_pool = FALSE;
}
if (!qt_src->context && !_find_local_gl_context (qt_src))
return FALSE;
if (!qt6_gl_window_set_context (qt_src->window, qt_src->context))
return FALSE;
if (!pool) {
if (!qt_src->context || !GST_IS_GL_CONTEXT (qt_src->context))
return FALSE;
pool = gst_gl_buffer_pool_new (qt_src->context);
GST_INFO_OBJECT (qt_src, "No pool, create one ourself %p", pool);
}
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set_params (config, caps, size, min, max);
gst_buffer_pool_config_add_option (config, GST_BUFFER_POOL_OPTION_VIDEO_META);
if (gst_query_find_allocation_meta (query, GST_GL_SYNC_META_API_TYPE, NULL))
gst_buffer_pool_config_add_option (config,
GST_BUFFER_POOL_OPTION_GL_SYNC_META);
if (gst_query_get_n_allocation_params (query) > 0) {
gst_query_parse_nth_allocation_param (query, 0, &allocator, &params);
gst_buffer_pool_config_set_allocator (config, allocator, &params);
GST_INFO_OBJECT (qt_src, "got allocator %p", allocator);
update_allocator = TRUE;
} else {
allocator = NULL;
gst_allocation_params_init (&params);
update_allocator = FALSE;
}
glparams =
gst_gl_video_allocation_params_new (qt_src->context, &params, &vinfo, 0,
NULL, GST_GL_TEXTURE_TARGET_2D, GST_GL_RGBA);
gst_buffer_pool_config_set_gl_allocation_params (config,
(GstGLAllocationParams *) glparams);
gst_gl_allocation_params_free ((GstGLAllocationParams *) glparams);
if (!gst_buffer_pool_set_config (pool, config))
GST_WARNING_OBJECT (qt_src, "Failed to set buffer pool config");
if (update_allocator)
gst_query_set_nth_allocation_param (query, 0, allocator, &params);
else
gst_query_add_allocation_param (query, allocator, &params);
if (allocator)
gst_object_unref (allocator);
if (update_pool)
gst_query_set_nth_allocation_pool (query, 0, pool, size, min, max);
else
gst_query_add_allocation_pool (query, pool, size, min, max);
gst_object_unref (pool);
GST_INFO_OBJECT (qt_src, "successfully decide_allocation");
return TRUE;
}
static GstFlowReturn
gst_qml6_gl_src_create (GstPushSrc * psrc, GstBuffer ** buffer)
{
GstQml6GLSrc *qt_src = GST_QML6_GL_SRC (psrc);
GstCaps *updated_caps = NULL;
GstGLContext* context = qt_src->context;
GstGLSyncMeta *sync_meta;
*buffer = qt6_gl_window_take_buffer (qt_src->window, &updated_caps);
GST_DEBUG_OBJECT (qt_src, "produced buffer %p", *buffer);
if (!*buffer)
return GST_FLOW_FLUSHING;
if (updated_caps) {
GST_DEBUG_OBJECT (qt_src, "new_caps %" GST_PTR_FORMAT, updated_caps);
gst_base_src_set_caps (GST_BASE_SRC (qt_src), updated_caps);
}
gst_clear_caps (&updated_caps);
sync_meta = gst_buffer_get_gl_sync_meta(*buffer);
if (sync_meta)
gst_gl_sync_meta_wait(sync_meta, context);
if (!qt_src->downstream_supports_affine_meta) {
if (qt_src->pending_image_orientation) {
/* let downstream know the image orientation is vertical filp */
GstTagList *image_orientation_tag =
gst_tag_list_new (GST_TAG_IMAGE_ORIENTATION, "flip-rotate-180", NULL);
gst_pad_push_event (GST_BASE_SRC_PAD (psrc),
gst_event_new_tag (image_orientation_tag));
qt_src->pending_image_orientation = FALSE;
}
} else {
GstVideoAffineTransformationMeta *trans_meta;
trans_meta = gst_buffer_add_video_affine_transformation_meta (*buffer);
gst_video_affine_transformation_meta_apply_matrix (trans_meta,
vertical_flip_matrix);
}
GST_DEBUG_OBJECT (qt_src, "buffer create done %p", *buffer);
return GST_FLOW_OK;
}
static gboolean
gst_qml6_gl_src_unlock (GstBaseSrc * bsrc)
{
GstQml6GLSrc *qt_src = GST_QML6_GL_SRC (bsrc);
if (!qt_src->window)
return TRUE;
qt6_gl_window_unlock (qt_src->window);
return TRUE;
}
static gboolean
gst_qml6_gl_src_unlock_stop (GstBaseSrc * bsrc)
{
GstQml6GLSrc *qt_src = GST_QML6_GL_SRC (bsrc);
if (!qt_src->window)
return TRUE;
qt6_gl_window_unlock_stop (qt_src->window);
return TRUE;
}
static GstStateChangeReturn
gst_qml6_gl_src_change_state (GstElement * element, GstStateChange transition)
{
GstQml6GLSrc *qt_src = GST_QML6_GL_SRC (element);
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
QGuiApplication *app;
GST_DEBUG ("changing state: %s => %s",
gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT (transition)),
gst_element_state_get_name (GST_STATE_TRANSITION_NEXT (transition)));
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
app = static_cast < QGuiApplication * >(QCoreApplication::instance ());
if (!app) {
GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND,
("%s", "Failed to connect to Qt"),
("%s", "Could not retrieve QGuiApplication instance"));
return GST_STATE_CHANGE_FAILURE;
}
if (!qt_src->window) {
GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND,
("%s", "Required property \'window\' not set"), (NULL));
return GST_STATE_CHANGE_FAILURE;
}
if (!qt6_gl_window_is_scenegraph_initialized (qt_src->window)) {
GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND,
("%s", "Could not initialize window system"), (NULL));
return GST_STATE_CHANGE_FAILURE;
}
qt6_gl_window_use_default_fbo (qt_src->window, qt_src->default_fbo);
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
static gboolean
gst_qml6_gl_src_start (GstBaseSrc * basesrc)
{
GstQml6GLSrc *qt_src = GST_QML6_GL_SRC (basesrc);
/* already has get OpenGL configuration from qt */
if (qt_src->display && qt_src->qt_context)
return TRUE;
if (!qt6_gl_window_is_scenegraph_initialized (qt_src->window))
return FALSE;
qt_src->display = qt6_gl_window_get_display (qt_src->window);
qt_src->qt_context = qt6_gl_window_get_qt_context (qt_src->window);
qt_src->context = qt6_gl_window_get_context (qt_src->window);
if (!qt_src->display || !qt_src->qt_context) {
GST_ERROR_OBJECT (qt_src,
"Could not retrieve window system OpenGL configuration");
return FALSE;
}
GST_DEBUG_OBJECT (qt_src, "Got qt display %p and qt gl context %p",
qt_src->display, qt_src->qt_context);
return TRUE;
}
static gboolean
gst_qml6_gl_src_stop (GstBaseSrc * basesrc)
{
return TRUE;
}