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gstreamer/tests/examples/gl/qt/qglwidgetvideooverlay/pipeline.cpp
Matthew Waters 263255137e examples/gl/qt: fix the examples for the use of newer API 
gstgl doesn't undo/overwrite what GL state the examples are changing
anymore.  As such, the examples need to reset the GL state themselves
to be able to play nice with libgstgl
2017-12-09 19:32:24 +00:00

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/*
* GStreamer
* Copyright (C) 2008-2009 Julien Isorce <julien.isorce@gmail.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.
*/
#include <gst/video/videooverlay.h>
#include <gst/video/video.h>
#include <GL/gl.h>
#include "pipeline.h"
#define GST_MAP_GL (GST_MAP_FLAG_LAST << 1)
Pipeline::Pipeline(const WId id, const QString videoLocation):
m_winId(id),
m_videoLocation(videoLocation),
m_loop(NULL),
m_bus(NULL),
m_pipeline(NULL),
m_glimagesink(NULL)
{
create();
}
Pipeline::~Pipeline()
{
}
void Pipeline::create()
{
qDebug("Loading video: %s", m_videoLocation.toLatin1().data());
gst_init (NULL, NULL);
#ifdef WIN32
m_loop = g_main_loop_new (NULL, FALSE);
#endif
m_pipeline = gst_pipeline_new ("pipeline");
m_bus = gst_pipeline_get_bus (GST_PIPELINE (m_pipeline));
gst_bus_add_watch (m_bus, (GstBusFunc) bus_call, this);
gst_bus_set_sync_handler (m_bus, (GstBusSyncHandler) create_window, this, NULL);
gst_object_unref (m_bus);
GstElement* videosrc = gst_element_factory_make ("filesrc", "filesrc0");
GstElement* decodebin = gst_element_factory_make ("decodebin", "decodebin0");
m_glimagesink = gst_element_factory_make ("glimagesink", "sink0");
if (!videosrc || !decodebin || !m_glimagesink )
{
qDebug ("one element could not be found");
return;
}
g_object_set(G_OBJECT(videosrc), "num-buffers", 800, NULL);
g_object_set(G_OBJECT(videosrc), "location", m_videoLocation.toLatin1().data(), NULL);
g_signal_connect_object (G_OBJECT(m_glimagesink), "client-reshape", (GCallback) reshapeCallback, NULL, G_CONNECT_AFTER);
g_signal_connect_object (G_OBJECT(m_glimagesink), "client-draw", (GCallback) drawCallback, NULL, G_CONNECT_AFTER);
gst_bin_add_many (GST_BIN (m_pipeline), videosrc, decodebin, m_glimagesink, NULL);
gst_element_link_pads (videosrc, "src", decodebin, "sink");
g_signal_connect (decodebin, "pad-added", G_CALLBACK (cb_new_pad), this);
}
void Pipeline::start()
{
GstStateChangeReturn ret = gst_element_set_state (m_pipeline, GST_STATE_PLAYING);
if (ret == GST_STATE_CHANGE_FAILURE)
{
qDebug ("Failed to start up pipeline!");
/* check if there is an error message with details on the bus */
GstMessage* msg = gst_bus_poll (m_bus, GST_MESSAGE_ERROR, 0);
if (msg)
{
GError *err = NULL;
gst_message_parse_error (msg, &err, NULL);
qDebug ("ERROR: %s", err->message);
g_error_free (err);
gst_message_unref (msg);
}
return;
}
#ifdef WIN32
g_main_loop_run(m_loop);
#endif
}
//we don't want a thread safe stop in this example
void Pipeline::stop()
{
#ifdef WIN32
g_main_loop_quit(m_loop);
#else
emit stopRequested();
#endif
}
void Pipeline::unconfigure() const
{
gst_element_set_state (m_pipeline, GST_STATE_NULL);
gst_object_unref (m_pipeline);
}
void Pipeline::show()
{
emit showRequested();
}
//redraw the current frame in the drawable
void Pipeline::doExpose() const
{
if (m_pipeline && m_glimagesink)
gst_video_overlay_expose (GST_VIDEO_OVERLAY (m_glimagesink));
}
//post message to g_main_loop in order to call expose
//in the gt thread
void Pipeline::exposeRequested()
{
g_idle_add(cb_expose, this);
}
//-----------------------------------------------------------------------
//----------------------------- static members --------------------------
//-----------------------------------------------------------------------
//client reshape callback
gboolean Pipeline::reshapeCallback (GstElement *sink, void *context, guint width, guint height, gpointer data)
{
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
return TRUE;
}
//client draw callback
gboolean Pipeline::drawCallback (GstElement * gl_sink, void *context, GstSample * sample, gpointer data)
{
static GLfloat xrot = 0;
static GLfloat yrot = 0;
static GLfloat zrot = 0;
static GTimeVal current_time;
static glong last_sec = current_time.tv_sec;
static gint nbFrames = 0;
GstVideoFrame v_frame;
GstVideoInfo v_info;
guint texture = 0;
GstBuffer *buf = gst_sample_get_buffer (sample);
GstCaps *caps = gst_sample_get_caps (sample);
gst_video_info_from_caps (&v_info, caps);
if (!gst_video_frame_map (&v_frame, &v_info, buf, (GstMapFlags) (GST_MAP_READ | GST_MAP_GL))) {
g_warning ("Failed to map the video buffer");
return TRUE;
}
texture = *(guint *) v_frame.data[0];
g_get_current_time (&current_time);
nbFrames++ ;
if ((current_time.tv_sec - last_sec) >= 1)
{
qDebug ("GRPHIC FPS = %d", nbFrames);
nbFrames = 0;
last_sec = current_time.tv_sec;
}
glEnable(GL_DEPTH_TEST);
glEnable (GL_TEXTURE_2D);
glBindTexture (GL_TEXTURE_2D, texture);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glScalef (0.5, 0.5, 0.5);
glRotatef(xrot,1.0f,0.0f,0.0f);
glRotatef(yrot,0.0f,1.0f,0.0f);
glRotatef(zrot,0.0f,0.0f,1.0f);
glBegin(GL_QUADS);
// Front Face
glTexCoord2f(1.0, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(1.0, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
// Back Face
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
glTexCoord2f(1.0, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
glTexCoord2f(1.0, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
// Top Face
glTexCoord2f(1.0, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
glTexCoord2f(1.0, 0.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
// Bottom Face
glTexCoord2f(1.0, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0,1.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
// Right face
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
glTexCoord2f(1.0, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(1.0, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
// Left Face
glTexCoord2f(1.0, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
glTexCoord2f(1.0, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
glEnd();
glLoadIdentity();
glDisable(GL_DEPTH_TEST);
glBindTexture (GL_TEXTURE_2D, 0);
gst_video_frame_unmap (&v_frame);
xrot+=0.03f;
yrot+=0.02f;
zrot+=0.04f;
return TRUE;
}
gboolean Pipeline::bus_call (GstBus *bus, GstMessage *msg, Pipeline* p)
{
switch (GST_MESSAGE_TYPE (msg))
{
case GST_MESSAGE_EOS:
qDebug ("End-of-stream");
p->stop();
break;
case GST_MESSAGE_ERROR:
{
gchar *debug = NULL;
GError *err = NULL;
gst_message_parse_error (msg, &err, &debug);
qDebug ("Error: %s", err->message);
g_error_free (err);
if (debug)
{
qDebug ("Debug deails: %s", debug);
g_free (debug);
}
p->stop();
break;
}
default:
break;
}
return TRUE;
}
void Pipeline::cb_new_pad (GstElement* decodebin, GstPad* pad, Pipeline* p)
{
GstElement* sink = p->getVideoSink();
GstPad* glpad = gst_element_get_static_pad (sink, "sink");
//only link once
if (GST_PAD_IS_LINKED (glpad))
{
gst_object_unref (glpad);
return;
}
GstCaps* caps = gst_pad_get_current_caps (pad);
GstStructure* str = gst_caps_get_structure (caps, 0);
if (!g_strrstr (gst_structure_get_name (str), "video"))
{
gst_caps_unref (caps);
gst_object_unref (glpad);
return;
}
gst_caps_unref (caps);
GstPadLinkReturn ret = gst_pad_link (pad, glpad);
if (ret != GST_PAD_LINK_OK)
g_warning ("Failed to link with decodebin!\n");
p->show();
}
gboolean Pipeline::cb_expose (gpointer data)
{
((Pipeline*)data)->doExpose();
return FALSE;
}
GstBusSyncReply Pipeline::create_window (GstBus* bus, GstMessage* message, const Pipeline* p)
{
// ignore anything but 'prepare-window-handle' element messages
if (GST_MESSAGE_TYPE (message) != GST_MESSAGE_ELEMENT)
return GST_BUS_PASS;
if (!gst_is_video_overlay_prepare_window_handle_message (message))
return GST_BUS_PASS;
qDebug ("setting window handle");
//Passing 0 as the window_handle will tell the overlay to stop using that window and create an internal one.
//In the directdrawsink's gst_video_overlay_set_window_handle implementation, window_handle (parameter 2) is casted to HWND before it used.
gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (GST_MESSAGE_SRC (message)), (guintptr)p->winId());
gst_message_unref (message);
return GST_BUS_DROP;
}
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