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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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566 lines
17 KiB
C
566 lines
17 KiB
C
/* GStreamer
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* Copyright (C) 2007 Haakon Sporsheim <hakon.sporsheim@tandberg.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-gdiscreencapsrc
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* @title: gdiscreencapsrc
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*
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* This element uses GDI to capture the desktop or a portion of it.
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* The default is capturing the whole desktop, but #GstGDIScreenCapSrc:x,
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* #GstGDIScreenCapSrc:y, #GstGDIScreenCapSrc:width and
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* #GstGDIScreenCapSrc:height can be used to select a particular region.
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* Use #GstGDIScreenCapSrc:monitor for changing which monitor to capture
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* from.
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*
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* Set #GstGDIScreenCapSrc:cursor to TRUE to include the mouse cursor.
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*
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* ## Example pipelines
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* |[
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* gst-launch-1.0 gdiscreencapsrc ! videoconvert ! dshowvideosink
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* ]| Capture the desktop and display it.
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* |[
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* gst-launch-1.0 gdiscreencapsrc x=100 y=100 width=320 height=240 cursor=TRUE
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* ! videoconvert ! dshowvideosink
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* ]| Capture a portion of the desktop, including the mouse cursor, and
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* display it.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstgdiscreencapsrc.h"
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#include <gst/video/video.h>
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GST_DEBUG_CATEGORY_STATIC (gdiscreencapsrc_debug);
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static GstStaticPadTemplate src_template =
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GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("BGR")));
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#define gst_gdiscreencapsrc_parent_class parent_class
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G_DEFINE_TYPE (GstGDIScreenCapSrc, gst_gdiscreencapsrc, GST_TYPE_PUSH_SRC);
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enum
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{
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PROP_0,
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PROP_MONITOR,
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PROP_SHOW_CURSOR,
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PROP_X_POS,
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PROP_Y_POS,
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PROP_WIDTH,
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PROP_HEIGHT
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};
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/* Fwd. decl. */
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static void gst_gdiscreencapsrc_dispose (GObject * object);
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static void gst_gdiscreencapsrc_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_gdiscreencapsrc_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstCaps *gst_gdiscreencapsrc_fixate (GstBaseSrc * bsrc, GstCaps * caps);
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static gboolean gst_gdiscreencapsrc_set_caps (GstBaseSrc * bsrc,
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GstCaps * caps);
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static GstCaps *gst_gdiscreencapsrc_get_caps (GstBaseSrc * bsrc,
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GstCaps * filter);
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static gboolean gst_gdiscreencapsrc_start (GstBaseSrc * bsrc);
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static gboolean gst_gdiscreencapsrc_unlock (GstBaseSrc * bsrc);
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static GstFlowReturn gst_gdiscreencapsrc_create (GstPushSrc * src,
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GstBuffer ** buf);
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static gboolean gst_gdiscreencapsrc_screen_capture (GstGDIScreenCapSrc * src,
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GstBuffer * buf);
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/* Implementation. */
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static void
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gst_gdiscreencapsrc_class_init (GstGDIScreenCapSrcClass * klass)
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{
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GObjectClass *go_class;
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GstElementClass *e_class;
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GstBaseSrcClass *bs_class;
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GstPushSrcClass *ps_class;
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go_class = (GObjectClass *) klass;
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e_class = (GstElementClass *) klass;
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bs_class = (GstBaseSrcClass *) klass;
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ps_class = (GstPushSrcClass *) klass;
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go_class->dispose = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_dispose);
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go_class->set_property = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_set_property);
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go_class->get_property = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_get_property);
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bs_class->get_caps = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_get_caps);
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bs_class->set_caps = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_set_caps);
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bs_class->start = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_start);
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bs_class->unlock = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_unlock);
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bs_class->fixate = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_fixate);
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ps_class->create = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_create);
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g_object_class_install_property (go_class, PROP_MONITOR,
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g_param_spec_int ("monitor",
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"Monitor", "Which monitor to use (0 = 1st monitor and default)",
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0, G_MAXINT, 0, G_PARAM_READWRITE));
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g_object_class_install_property (go_class, PROP_SHOW_CURSOR,
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g_param_spec_boolean ("cursor", "Show mouse cursor",
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"Whether to show mouse cursor (default off)",
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FALSE, G_PARAM_READWRITE));
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g_object_class_install_property (go_class, PROP_X_POS,
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g_param_spec_int ("x", "X",
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"Horizontal coordinate of top left corner for the screen capture "
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"area", 0, G_MAXINT, 0, G_PARAM_READWRITE));
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g_object_class_install_property (go_class, PROP_Y_POS,
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g_param_spec_int ("y", "Y",
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"Vertical coordinate of top left corner for the screen capture "
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"area", 0, G_MAXINT, 0, G_PARAM_READWRITE));
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g_object_class_install_property (go_class, PROP_WIDTH,
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g_param_spec_int ("width", "Width",
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"Width of screen capture area (0 = maximum)",
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0, G_MAXINT, 0, G_PARAM_READWRITE));
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g_object_class_install_property (go_class, PROP_HEIGHT,
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g_param_spec_int ("height", "Height",
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"Height of screen capture area (0 = maximum)",
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0, G_MAXINT, 0, G_PARAM_READWRITE));
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gst_element_class_add_static_pad_template (e_class, &src_template);
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gst_element_class_set_static_metadata (e_class,
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"GDI screen capture source", "Source/Video", "Captures screen",
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"Haakon Sporsheim <hakon.sporsheim@tandberg.com>");
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GST_DEBUG_CATEGORY_INIT (gdiscreencapsrc_debug,
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"gdiscreencapsrc", 0, "GDI screen capture source");
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}
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static void
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gst_gdiscreencapsrc_init (GstGDIScreenCapSrc * src)
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{
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/* Set src element initial values... */
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src->dibMem = NULL;
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src->hBitmap = (HBITMAP) INVALID_HANDLE_VALUE;
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src->memDC = (HDC) INVALID_HANDLE_VALUE;
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src->capture_x = 0;
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src->capture_y = 0;
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src->capture_w = 0;
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src->capture_h = 0;
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src->monitor = 0;
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src->show_cursor = FALSE;
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gst_base_src_set_format (GST_BASE_SRC (src), GST_FORMAT_TIME);
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gst_base_src_set_live (GST_BASE_SRC (src), TRUE);
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}
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static void
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gst_gdiscreencapsrc_dispose (GObject * object)
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{
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GstGDIScreenCapSrc *src = GST_GDISCREENCAPSRC (object);
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if (src->hBitmap != INVALID_HANDLE_VALUE)
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DeleteObject (src->hBitmap);
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if (src->memDC != INVALID_HANDLE_VALUE)
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DeleteDC (src->memDC);
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src->hBitmap = (HBITMAP) INVALID_HANDLE_VALUE;
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src->memDC = (HDC) INVALID_HANDLE_VALUE;
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src->dibMem = NULL;
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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static void
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gst_gdiscreencapsrc_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstGDIScreenCapSrc *src = GST_GDISCREENCAPSRC (object);
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switch (prop_id) {
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case PROP_MONITOR:
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if (g_value_get_int (value) >= GetSystemMetrics (SM_CMONITORS)) {
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G_OBJECT_WARN_INVALID_PSPEC (object, "Monitor", prop_id, pspec);
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break;
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}
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src->monitor = g_value_get_int (value);
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break;
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case PROP_SHOW_CURSOR:
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src->show_cursor = g_value_get_boolean (value);
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break;
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case PROP_X_POS:
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src->capture_x = g_value_get_int (value);
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break;
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case PROP_Y_POS:
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src->capture_y = g_value_get_int (value);
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break;
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case PROP_WIDTH:
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src->capture_w = g_value_get_int (value);
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break;
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case PROP_HEIGHT:
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src->capture_h = g_value_get_int (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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};
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}
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static void
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gst_gdiscreencapsrc_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstGDIScreenCapSrc *src = GST_GDISCREENCAPSRC (object);
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switch (prop_id) {
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case PROP_MONITOR:
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g_value_set_int (value, src->monitor);
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break;
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case PROP_SHOW_CURSOR:
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g_value_set_boolean (value, src->show_cursor);
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break;
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case PROP_X_POS:
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g_value_set_int (value, src->capture_x);
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break;
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case PROP_Y_POS:
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g_value_set_int (value, src->capture_y);
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break;
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case PROP_WIDTH:
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g_value_set_int (value, src->capture_w);
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break;
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case PROP_HEIGHT:
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g_value_set_int (value, src->capture_h);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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};
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}
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static GstCaps *
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gst_gdiscreencapsrc_fixate (GstBaseSrc * bsrc, GstCaps * caps)
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{
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GstStructure *structure;
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caps = gst_caps_make_writable (caps);
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structure = gst_caps_get_structure (caps, 0);
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gst_structure_fixate_field_nearest_int (structure, "width", 640);
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gst_structure_fixate_field_nearest_int (structure, "height", 480);
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gst_structure_fixate_field_nearest_fraction (structure, "framerate", 30, 1);
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caps = GST_BASE_SRC_CLASS (parent_class)->fixate (bsrc, caps);
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return caps;
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}
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static gboolean
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gst_gdiscreencapsrc_set_caps (GstBaseSrc * bsrc, GstCaps * caps)
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{
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GstGDIScreenCapSrc *src = GST_GDISCREENCAPSRC (bsrc);
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HWND capture;
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HDC device;
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GstStructure *structure;
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const GValue *framerate;
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structure = gst_caps_get_structure (caps, 0);
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src->src_rect = src->screen_rect;
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if (src->capture_w && src->capture_h) {
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src->src_rect.left += src->capture_x;
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src->src_rect.top += src->capture_y;
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src->src_rect.right = src->src_rect.left + src->capture_w;
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src->src_rect.bottom = src->src_rect.top + src->capture_h;
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}
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framerate = gst_structure_get_value (structure, "framerate");
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if (framerate) {
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src->rate_numerator = gst_value_get_fraction_numerator (framerate);
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src->rate_denominator = gst_value_get_fraction_denominator (framerate);
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}
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src->info.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
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src->info.bmiHeader.biWidth = src->src_rect.right - src->src_rect.left;
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src->info.bmiHeader.biHeight = src->src_rect.top - src->src_rect.bottom;
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src->info.bmiHeader.biPlanes = 1;
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src->info.bmiHeader.biBitCount = 24;
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src->info.bmiHeader.biCompression = BI_RGB;
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src->info.bmiHeader.biSizeImage = 0;
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src->info.bmiHeader.biXPelsPerMeter = 0;
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src->info.bmiHeader.biYPelsPerMeter = 0;
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src->info.bmiHeader.biClrUsed = 0;
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src->info.bmiHeader.biClrImportant = 0;
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/* Cleanup first */
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if (src->hBitmap != INVALID_HANDLE_VALUE)
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DeleteObject (src->hBitmap);
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if (src->memDC != INVALID_HANDLE_VALUE)
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DeleteDC (src->memDC);
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/* Allocate */
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capture = GetDesktopWindow ();
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device = GetDC (capture);
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src->hBitmap = CreateDIBSection (device, &(src->info), DIB_RGB_COLORS,
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(void **) &(src->dibMem), 0, 0);
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src->memDC = CreateCompatibleDC (device);
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SelectObject (src->memDC, src->hBitmap);
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ReleaseDC (capture, device);
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GST_DEBUG_OBJECT (src, "size %dx%d, %d/%d fps",
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(gint) src->info.bmiHeader.biWidth,
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(gint) (-src->info.bmiHeader.biHeight),
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src->rate_numerator, src->rate_denominator);
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return TRUE;
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}
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static GstCaps *
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gst_gdiscreencapsrc_get_caps (GstBaseSrc * bsrc, GstCaps * filter)
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{
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GstGDIScreenCapSrc *src = GST_GDISCREENCAPSRC (bsrc);
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RECT rect_dst;
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GstCaps *caps;
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src->screen_rect = rect_dst = gst_win32_get_monitor_rect (src->monitor);
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if (src->capture_w && src->capture_h &&
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src->capture_x + src->capture_w < rect_dst.right - rect_dst.left &&
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src->capture_y + src->capture_h < rect_dst.bottom - rect_dst.top) {
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rect_dst.left = src->capture_x;
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rect_dst.top = src->capture_y;
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rect_dst.right = src->capture_x + src->capture_w;
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rect_dst.bottom = src->capture_y + src->capture_h;
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} else {
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/* Default values. */
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src->capture_x = src->capture_y = 0;
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src->capture_w = src->capture_h = 0;
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}
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GST_DEBUG ("width = %d, height=%d",
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(gint) (rect_dst.right - rect_dst.left),
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(gint) (rect_dst.bottom - rect_dst.top));
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caps = gst_caps_new_simple ("video/x-raw",
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"format", G_TYPE_STRING, "BGR",
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"width", G_TYPE_INT, rect_dst.right - rect_dst.left,
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"height", G_TYPE_INT, rect_dst.bottom - rect_dst.top,
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"framerate", GST_TYPE_FRACTION_RANGE, 1, G_MAXINT, G_MAXINT, 1,
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"pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1, NULL);
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if (filter) {
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GstCaps *tmp =
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gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
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gst_caps_unref (caps);
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caps = tmp;
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}
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return caps;
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}
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static gboolean
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gst_gdiscreencapsrc_start (GstBaseSrc * bsrc)
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{
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GstGDIScreenCapSrc *src = GST_GDISCREENCAPSRC (bsrc);
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src->frame_number = -1;
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return TRUE;
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}
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static gboolean
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gst_gdiscreencapsrc_unlock (GstBaseSrc * bsrc)
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{
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GstGDIScreenCapSrc *src = GST_GDISCREENCAPSRC (bsrc);
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GST_OBJECT_LOCK (src);
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if (src->clock_id) {
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GST_DEBUG_OBJECT (src, "Waking up waiting clock");
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gst_clock_id_unschedule (src->clock_id);
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}
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GST_OBJECT_UNLOCK (src);
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return TRUE;
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}
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static GstFlowReturn
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gst_gdiscreencapsrc_create (GstPushSrc * push_src, GstBuffer ** buf)
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{
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GstGDIScreenCapSrc *src = GST_GDISCREENCAPSRC (push_src);
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GstBuffer *new_buf;
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gint new_buf_size;
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GstClock *clock;
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GstClockTime buf_time, buf_dur;
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guint64 frame_number;
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if (G_UNLIKELY (!src->info.bmiHeader.biWidth ||
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!src->info.bmiHeader.biHeight)) {
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GST_ELEMENT_ERROR (src, CORE, NEGOTIATION, (NULL),
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("format wasn't negotiated before create function"));
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return GST_FLOW_NOT_NEGOTIATED;
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}
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new_buf_size = GST_ROUND_UP_4 (src->info.bmiHeader.biWidth * 3) *
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(-src->info.bmiHeader.biHeight);
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GST_LOG_OBJECT (src,
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"creating buffer of %d bytes with %dx%d image",
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new_buf_size, (gint) src->info.bmiHeader.biWidth,
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(gint) (-src->info.bmiHeader.biHeight));
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new_buf = gst_buffer_new_and_alloc (new_buf_size);
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clock = gst_element_get_clock (GST_ELEMENT (src));
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if (clock != NULL) {
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GstClockTime time, base_time;
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/* Calculate sync time. */
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time = gst_clock_get_time (clock);
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base_time = gst_element_get_base_time (GST_ELEMENT (src));
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buf_time = time - base_time;
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if (src->rate_numerator) {
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frame_number = gst_util_uint64_scale (buf_time,
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src->rate_numerator, GST_SECOND * src->rate_denominator);
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} else {
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frame_number = -1;
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}
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} else {
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buf_time = GST_CLOCK_TIME_NONE;
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frame_number = -1;
|
|
}
|
|
|
|
if (frame_number != -1 && frame_number == src->frame_number) {
|
|
GstClockID id;
|
|
GstClockReturn ret;
|
|
|
|
/* Need to wait for the next frame */
|
|
frame_number += 1;
|
|
|
|
/* Figure out what the next frame time is */
|
|
buf_time = gst_util_uint64_scale (frame_number,
|
|
src->rate_denominator * GST_SECOND, src->rate_numerator);
|
|
|
|
id = gst_clock_new_single_shot_id (clock,
|
|
buf_time + gst_element_get_base_time (GST_ELEMENT (src)));
|
|
GST_OBJECT_LOCK (src);
|
|
src->clock_id = id;
|
|
GST_OBJECT_UNLOCK (src);
|
|
|
|
GST_DEBUG_OBJECT (src, "Waiting for next frame time %" G_GUINT64_FORMAT,
|
|
buf_time);
|
|
ret = gst_clock_id_wait (id, NULL);
|
|
GST_OBJECT_LOCK (src);
|
|
|
|
gst_clock_id_unref (id);
|
|
src->clock_id = NULL;
|
|
if (ret == GST_CLOCK_UNSCHEDULED) {
|
|
/* Got woken up by the unlock function */
|
|
GST_OBJECT_UNLOCK (src);
|
|
return GST_FLOW_FLUSHING;
|
|
}
|
|
GST_OBJECT_UNLOCK (src);
|
|
|
|
/* Duration is a complete 1/fps frame duration */
|
|
buf_dur =
|
|
gst_util_uint64_scale_int (GST_SECOND, src->rate_denominator,
|
|
src->rate_numerator);
|
|
} else if (frame_number != -1) {
|
|
GstClockTime next_buf_time;
|
|
|
|
GST_DEBUG_OBJECT (src, "No need to wait for next frame time %"
|
|
G_GUINT64_FORMAT " next frame = %" G_GINT64_FORMAT " prev = %"
|
|
G_GINT64_FORMAT, buf_time, frame_number, src->frame_number);
|
|
next_buf_time = gst_util_uint64_scale (frame_number + 1,
|
|
src->rate_denominator * GST_SECOND, src->rate_numerator);
|
|
/* Frame duration is from now until the next expected capture time */
|
|
buf_dur = next_buf_time - buf_time;
|
|
} else {
|
|
buf_dur = GST_CLOCK_TIME_NONE;
|
|
}
|
|
src->frame_number = frame_number;
|
|
|
|
GST_BUFFER_TIMESTAMP (new_buf) = buf_time;
|
|
GST_BUFFER_DURATION (new_buf) = buf_dur;
|
|
|
|
/* Do screen capture and put it into buffer... */
|
|
gst_gdiscreencapsrc_screen_capture (src, new_buf);
|
|
|
|
gst_object_unref (clock);
|
|
|
|
*buf = new_buf;
|
|
return GST_FLOW_OK;
|
|
}
|
|
|
|
static gboolean
|
|
gst_gdiscreencapsrc_screen_capture (GstGDIScreenCapSrc * src, GstBuffer * buf)
|
|
{
|
|
HWND capture;
|
|
HDC winDC;
|
|
gint height, width;
|
|
GstMapInfo map;
|
|
|
|
if (G_UNLIKELY (!src->hBitmap || !src->dibMem))
|
|
return FALSE;
|
|
|
|
width = src->info.bmiHeader.biWidth;
|
|
height = -src->info.bmiHeader.biHeight;
|
|
|
|
/* Capture screen */
|
|
capture = GetDesktopWindow ();
|
|
winDC = GetWindowDC (capture);
|
|
|
|
BitBlt (src->memDC, 0, 0, width, height,
|
|
winDC, src->src_rect.left, src->src_rect.top, SRCCOPY);
|
|
|
|
ReleaseDC (capture, winDC);
|
|
|
|
/* Capture mouse cursor */
|
|
if (src->show_cursor) {
|
|
CURSORINFO ci;
|
|
|
|
ci.cbSize = sizeof (CURSORINFO);
|
|
GetCursorInfo (&ci);
|
|
if (ci.flags & CURSOR_SHOWING) {
|
|
ICONINFO ii;
|
|
|
|
GetIconInfo (ci.hCursor, &ii);
|
|
|
|
DrawIconEx (src->memDC,
|
|
ci.ptScreenPos.x - src->src_rect.left - ii.xHotspot,
|
|
ci.ptScreenPos.y - src->src_rect.top - ii.yHotspot, ci.hCursor, 0, 0,
|
|
0, NULL, DI_DEFAULTSIZE | DI_NORMAL | DI_COMPAT);
|
|
|
|
DeleteObject (ii.hbmColor);
|
|
DeleteObject (ii.hbmMask);
|
|
}
|
|
}
|
|
|
|
/* Copy DC bits to GST buffer */
|
|
gst_buffer_map (buf, &map, GST_MAP_WRITE);
|
|
memcpy (map.data, src->dibMem, map.size);
|
|
gst_buffer_unmap (buf, &map);
|
|
|
|
return TRUE;
|
|
}
|