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/* Minimal screencast recorder for clutter (GL) using GEGL.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Copyright (C) 2008 Øyvind Kolås
* Copyright (C) 2008 OpenedHand
*/
#include <gegl.h>
#include <clutter/clutter.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <string.h>
/* some basic configuration */
#define FPS 25
#define KBITRATE (7000*8)
/* TODO: Move away from pixbufs, the original code used a pixbuf but
* with newer GEGL it should be better to use a linear buffer directly
*/
static GThread *encode_thread = NULL;
static GStaticMutex mutex = G_STATIC_MUTEX_INIT;
static gint prev_width = 0;
static gint prev_height = 0;
static gint frames = 0;
static guchar *pixels = NULL;
static guchar *pixels_inverted = NULL;
static gboolean got_data = FALSE;
static GdkPixbuf *pixbuf = NULL;
static GeglNode *gegl = NULL;
static GeglNode *load_pixbuf = NULL;
static GeglNode *ff_save;
static long prev_stored = 0;
static gpointer encoder (gpointer data);
static void save_frame (gpointer data);
long babl_ticks (void);
void gcr_prepare (const gchar *path)
{
if (!g_thread_supported ()) g_thread_init (NULL);
gegl_init (NULL, NULL);
gegl = gegl_node_new ();
ff_save = gegl_node_new_child (gegl,
"operation", "ff-save",
"bitrate", KBITRATE *1000.0,
"fps", (FPS * 1.0),
"path", path,
NULL
);
load_pixbuf = gegl_node_create_child (gegl, "pixbuf");
gegl_node_link (load_pixbuf, ff_save);
}
void gcr_start (void)
{
ClutterActor *stage = clutter_stage_get_default ();
g_signal_connect_after (stage, "paint", G_CALLBACK (save_frame), NULL);
encode_thread = g_thread_create (encoder, NULL, FALSE, NULL);
prev_stored = babl_ticks ();
}
void gcr_stop (void)
{
/* FIXME: NYI */
}
/* this is called by clutter each time a stage has been rendered */
static void save_frame (gpointer data)
{
GLint viewport[4];
gint x, y, width, height;
glong delta;
/* issue commands that might make sure we're fully rendered ... */
glFinish ();
glFlush ();
glGetIntegerv(GL_VIEWPORT, viewport);
x = viewport[0];
y = viewport[1];
width = viewport[2] - x;
height = viewport[3] - y;
/* by locking here we wait until the encoder thread is finished encoding */
g_static_mutex_lock (&mutex);
/* we only create the pixbuf on the first frame (hopefully) */
if (prev_width != width ||
prev_height != height)
{
if (pixels)
g_free (pixels);
if (pixels_inverted)
g_free (pixels_inverted);
if (pixbuf)
g_object_unref (pixbuf);
pixels_inverted = g_malloc (width * height * 4);
pixels = g_malloc (width * height * 4);
pixbuf = gdk_pixbuf_new_from_data (pixels, GDK_COLORSPACE_RGB, TRUE, 8,
width, height, width * 4, NULL, NULL);
prev_width = width;
prev_height = height;
}
/* figure out the time elapsed since the previously stored encoded frame */
delta = babl_ticks () - prev_stored;
if (got_data == FALSE && delta >= 1000000.0/FPS)
{
prev_stored += delta;
glReadPixels (x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels_inverted);
/* we only do the read pixels here, the encoder thread does the
* inversion
*/
got_data = TRUE;
frames = delta / (1000000.0/FPS);
/* FIXME: * precision loss, we need to keep a remainder around to produce
* the correct framerate */
}
g_static_mutex_unlock (&mutex);
}
static gpointer encoder (gpointer data)
{
while (TRUE)
{
gint rowstride;
gint width, height;
gint repeats = 0;
gboolean action = FALSE;
/* critical section */
g_static_mutex_lock (&mutex);
if (got_data)
{
gint y;
height = prev_height;
width = prev_width;
rowstride = prev_width * 4;
/* flip the image right side up when copying it */
for (y=0; y<height; y++)
{
memcpy (pixels + ((height-y-1) * rowstride),
pixels_inverted + y * rowstride, rowstride);
}
got_data = FALSE;
action = TRUE; /* store that we've got work to do */
repeats = frames;
}
g_static_mutex_unlock (&mutex);
if (action)
{
static gint dump_no = -1;
if (dump_no<=0)
{
dump_no++;
}
else
{
/* encode the current frame for the number of frames
* that is needed
*/
while (repeats--)
{
gegl_node_set (load_pixbuf, "pixbuf", pixbuf, NULL);
gegl_node_process (ff_save);
}
}
}
else
{
g_usleep (100);
}
}
}
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