gstreamer/ext/qt/qtwindow.cc
Matthew Waters c7181bedac qt: return a different GstGLDisplay object when the first sink requests
This allows the 'replace-gstreamer-opengl-context' context machinery to
correctly replace the OpenGL context used by the pipeline when the first
qmlglsink is added to the pipeline.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/982>
2021-05-11 06:40:38 +00:00

437 lines
11 KiB
C++

/*
* GStreamer
* Copyright (C) 2016 Freescale Semiconductor, Inc. All rights reserved.
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <gst/video/video.h>
#include <gst/gl/gstglfuncs.h>
#include "qtwindow.h"
#include "gstqsgtexture.h"
#include "gstqtglutility.h"
#include <QtCore/QDateTime>
#include <QtCore/QRunnable>
#include <QtGui/QGuiApplication>
#include <QtQuick/QQuickWindow>
#include <QOpenGLFramebufferObject>
/* compatibility definitions... */
#ifndef GL_READ_FRAMEBUFFER
#define GL_READ_FRAMEBUFFER 0x8CA8
#endif
#ifndef GL_DRAW_FRAMEBUFFER
#define GL_DRAW_FRAMEBUFFER 0x8CA9
#endif
/**
* SECTION:
*
* #QtGLWindow is an #QQuickWindow that grab QtQuick view to GStreamer OpenGL video buffers.
*/
GST_DEBUG_CATEGORY_STATIC (qt_window_debug);
#define GST_CAT_DEFAULT qt_window_debug
struct _QtGLWindowPrivate
{
GMutex lock;
GCond update_cond;
GstBuffer *buffer;
GstCaps *caps;
GstVideoInfo v_info;
gboolean initted;
gboolean updated;
gboolean quit;
gboolean result;
gboolean useDefaultFbo;
GstGLDisplay *display;
GstGLContext *other_context;
GLuint fbo;
/* frames that qmlview rendered in its gl thread */
quint64 frames_rendered;
quint64 start;
quint64 stop;
};
class InitQtGLContext : public QRunnable
{
public:
InitQtGLContext(QtGLWindow *window);
void run();
private:
QtGLWindow *window_;
};
InitQtGLContext::InitQtGLContext(QtGLWindow *window) :
window_(window)
{
}
void InitQtGLContext::run()
{
window_->onSceneGraphInitialized();
}
QtGLWindow::QtGLWindow ( QWindow * parent, QQuickWindow *src ) :
QQuickWindow( parent ), source (src)
{
QGuiApplication *app = static_cast<QGuiApplication *> (QCoreApplication::instance ());
static gsize _debug;
g_assert (app != NULL);
if (g_once_init_enter (&_debug)) {
GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "qtglwindow", 0, "Qt GL QuickWindow");
g_once_init_leave (&_debug, 1);
}
this->priv = g_new0 (QtGLWindowPrivate, 1);
g_mutex_init (&this->priv->lock);
g_cond_init (&this->priv->update_cond);
this->priv->display = gst_qt_get_gl_display(FALSE);
connect (source, SIGNAL(beforeRendering()), this, SLOT(beforeRendering()), Qt::DirectConnection);
connect (source, SIGNAL(afterRendering()), this, SLOT(afterRendering()), Qt::DirectConnection);
connect (app, SIGNAL(aboutToQuit()), this, SLOT(aboutToQuit()), Qt::DirectConnection);
if (source->isSceneGraphInitialized())
source->scheduleRenderJob(new InitQtGLContext(this), QQuickWindow::BeforeSynchronizingStage);
else
connect (source, SIGNAL(sceneGraphInitialized()), this, SLOT(onSceneGraphInitialized()), Qt::DirectConnection);
connect (source, SIGNAL(sceneGraphInvalidated()), this, SLOT(onSceneGraphInvalidated()), Qt::DirectConnection);
GST_DEBUG ("%p init Qt Window", this->priv->display);
}
QtGLWindow::~QtGLWindow()
{
GST_DEBUG ("deinit Qt Window");
g_mutex_clear (&this->priv->lock);
g_cond_clear (&this->priv->update_cond);
if (this->priv->other_context)
gst_object_unref(this->priv->other_context);
if (this->priv->display)
gst_object_unref(this->priv->display);
g_free (this->priv);
this->priv = NULL;
}
void
QtGLWindow::beforeRendering()
{
unsigned int width, height;
g_mutex_lock (&this->priv->lock);
static gsize once = 0;
if (g_once_init_enter(&once)) {
this->priv->start = QDateTime::currentDateTime().toMSecsSinceEpoch();
g_once_init_leave(&once,1);
}
if (!fbo && !this->priv->useDefaultFbo) {
width = source->width();
height = source->height();
GST_DEBUG ("create new framebuffer object %dX%d", width, height);
fbo.reset(new QOpenGLFramebufferObject (width, height,
QOpenGLFramebufferObject::NoAttachment, GL_TEXTURE_2D, GL_RGBA));
source->setRenderTarget(fbo.data());
} else if (this->priv->useDefaultFbo) {
GST_DEBUG ("use default fbo for render target");
fbo.reset(NULL);
source->setRenderTarget(NULL);
}
g_mutex_unlock (&this->priv->lock);
}
void
QtGLWindow::afterRendering()
{
GstVideoFrame gl_frame;
GstVideoInfo *info;
GstGLContext *context;
gboolean ret;
guint width, height;
const GstGLFuncs *gl;
GLuint dst_tex;
g_mutex_lock (&this->priv->lock);
this->priv->frames_rendered++;
if(!this->priv->buffer || this->priv->updated == TRUE) {
GST_DEBUG ("skip this frame");
g_mutex_unlock (&this->priv->lock);
return;
}
GST_DEBUG ("copy buffer %p",this->priv->buffer);
width = GST_VIDEO_INFO_WIDTH (&this->priv->v_info);
height = GST_VIDEO_INFO_HEIGHT (&this->priv->v_info);
info = &this->priv->v_info;
context = this->priv->other_context;
gst_gl_context_activate (context, TRUE);
gl = context->gl_vtable;
ret = gst_video_frame_map (&gl_frame, info, this->priv->buffer,
(GstMapFlags) (GST_MAP_WRITE | GST_MAP_GL));
if (!ret) {
this->priv->buffer = NULL;
GST_ERROR ("Failed to map video frame");
goto errors;
}
gl->BindFramebuffer (GL_READ_FRAMEBUFFER, this->source->renderTargetId());
ret = gst_gl_context_check_framebuffer_status (context, GL_READ_FRAMEBUFFER);
if (!ret) {
GST_ERROR ("FBO errors");
goto errors;
}
dst_tex = *(guint *) gl_frame.data[0];
GST_DEBUG ("qml render target id %d, render to tex %d %dX%d",
this->source->renderTargetId(), dst_tex, width,height);
gl->BindTexture (GL_TEXTURE_2D, dst_tex);
if (gl->BlitFramebuffer) {
gl->BindFramebuffer (GL_DRAW_FRAMEBUFFER, this->priv->fbo);
gl->FramebufferTexture2D (GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, dst_tex, 0);
ret = gst_gl_context_check_framebuffer_status (context, GL_DRAW_FRAMEBUFFER);
if (!ret) {
GST_ERROR ("FBO errors");
goto errors;
}
if (this->priv->useDefaultFbo)
gl->ReadBuffer (GL_BACK);
else
gl->ReadBuffer (GL_COLOR_ATTACHMENT0);
gl->BlitFramebuffer (0, 0, width, height,
0, 0, width, height,
GL_COLOR_BUFFER_BIT, GL_LINEAR);
} else {
gl->CopyTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, 0, 0, width, height, 0);
}
GST_DEBUG ("rendering finished");
errors:
gl->BindFramebuffer (GL_FRAMEBUFFER, 0);
gst_video_frame_unmap (&gl_frame);
gst_gl_context_activate (context, FALSE);
this->priv->result = ret;
this->priv->updated = TRUE;
g_cond_signal (&this->priv->update_cond);
g_mutex_unlock (&this->priv->lock);
}
void
QtGLWindow::aboutToQuit()
{
g_mutex_lock (&this->priv->lock);
this->priv->updated = TRUE;
this->priv->quit = TRUE;
g_cond_signal (&this->priv->update_cond);
this->priv->stop = QDateTime::currentDateTime().toMSecsSinceEpoch();
qint64 duration = this->priv->stop - this->priv->start;
float fps = ((float)this->priv->frames_rendered / duration * 1000);
GST_DEBUG("about to quit, total refresh frames (%lld) in (%0.3f) seconds, fps: %0.3f",
this->priv->frames_rendered, (float)duration / 1000, fps);
g_mutex_unlock (&this->priv->lock);
}
void
QtGLWindow::onSceneGraphInitialized()
{
GST_DEBUG ("scene graph initialization with Qt GL context %p",
this->source->openglContext ());
this->priv->initted = gst_qt_get_gl_wrapcontext (this->priv->display,
&this->priv->other_context, NULL);
if (this->priv->initted && this->priv->other_context) {
const GstGLFuncs *gl;
gst_gl_context_activate (this->priv->other_context, TRUE);
gl = this->priv->other_context->gl_vtable;
gl->GenFramebuffers (1, &this->priv->fbo);
gst_gl_context_activate (this->priv->other_context, FALSE);
}
GST_DEBUG ("%p created wrapped GL context %" GST_PTR_FORMAT, this,
this->priv->other_context);
}
void
QtGLWindow::onSceneGraphInvalidated()
{
GST_DEBUG ("scene graph invalidated");
if (this->priv->fbo && this->priv->other_context) {
const GstGLFuncs *gl;
gst_gl_context_activate (this->priv->other_context, TRUE);
gl = this->priv->other_context->gl_vtable;
gl->DeleteFramebuffers (1, &this->priv->fbo);
gst_gl_context_activate (this->priv->other_context, FALSE);
}
}
bool
QtGLWindow::getGeometry(int * width, int * height)
{
if (width == NULL || height == NULL)
return FALSE;
*width = this->source->width();
*height = this->source->height();
return TRUE;
}
GstGLContext *
qt_window_get_qt_context (QtGLWindow * qt_window)
{
g_return_val_if_fail (qt_window != NULL, NULL);
if (!qt_window->priv->other_context)
return NULL;
return (GstGLContext *) gst_object_ref (qt_window->priv->other_context);
}
GstGLDisplay *
qt_window_get_display (QtGLWindow * qt_window)
{
g_return_val_if_fail (qt_window != NULL, NULL);
if (!qt_window->priv->display)
return NULL;
return (GstGLDisplay *) gst_object_ref (qt_window->priv->display);
}
gboolean
qt_window_is_scenegraph_initialized (QtGLWindow * qt_window)
{
g_return_val_if_fail (qt_window != NULL, FALSE);
return qt_window->priv->initted;
}
gboolean
qt_window_set_caps (QtGLWindow * qt_window, GstCaps * caps)
{
GstVideoInfo v_info;
g_return_val_if_fail (qt_window != NULL, FALSE);
g_return_val_if_fail (GST_IS_CAPS (caps), FALSE);
g_return_val_if_fail (gst_caps_is_fixed (caps), FALSE);
if (qt_window->priv->caps && gst_caps_is_equal_fixed (qt_window->priv->caps, caps))
return TRUE;
if (!gst_video_info_from_caps (&v_info, caps))
return FALSE;
g_mutex_lock (&qt_window->priv->lock);
gst_caps_replace (&qt_window->priv->caps, caps);
qt_window->priv->v_info = v_info;
g_mutex_unlock (&qt_window->priv->lock);
return TRUE;
}
gboolean
qt_window_set_buffer (QtGLWindow * qt_window, GstBuffer * buffer)
{
g_return_val_if_fail (qt_window != NULL, FALSE);
g_return_val_if_fail (qt_window->priv->initted, FALSE);
gboolean ret;
g_mutex_lock (&qt_window->priv->lock);
if (qt_window->priv->quit){
GST_DEBUG("about to quit, drop this buffer");
g_mutex_unlock (&qt_window->priv->lock);
return TRUE;
}
qt_window->priv->updated = FALSE;
qt_window->priv->buffer = buffer;
while (!qt_window->priv->updated)
g_cond_wait (&qt_window->priv->update_cond, &qt_window->priv->lock);
ret = qt_window->priv->result;
g_mutex_unlock (&qt_window->priv->lock);
return ret;
}
void
qt_window_use_default_fbo (QtGLWindow * qt_window, gboolean useDefaultFbo)
{
g_return_if_fail (qt_window != NULL);
g_mutex_lock (&qt_window->priv->lock);
GST_DEBUG ("set to use default fbo %d", useDefaultFbo);
qt_window->priv->useDefaultFbo = useDefaultFbo;
g_mutex_unlock (&qt_window->priv->lock);
}