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611 lines
18 KiB
C
611 lines
18 KiB
C
/* GStreamer
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* Copyright (C) 2019 OKADA Jun-ichi <okada@abt.jp>
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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-dxgiscreencapsrc
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* @title: dxgiscreencapsrc
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*
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* This element uses DXGI Desktop Duplication API.
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* The default is capturing the whole desktop, but #GstDXGIScreenCapSrc:x,
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* #GstDXGIScreenCapSrc:y, #GstDXGIScreenCapSrc:width and
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* #GstDXGIScreenCapSrc:height can be used to select a particular region.
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* Use #GstDXGIScreenCapSrc:monitor for changing which monitor to capture
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* from.
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*
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* ## Example pipelines
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* |[
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* gst-launch-1.0 dxgiscreencapsrc ! videoconvert ! dshowvideosink
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* ]| Capture the desktop and display it.
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* |[
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* gst-launch-1.0 dxgiscreencapsrc x=100 y=100 width=320 height=240 !
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* videoconvert ! dshowvideosink
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* ]| Capture a portion of the desktop and 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 <windows.h>
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#include <versionhelpers.h>
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#include <gst/video/video.h>
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#include "gstdxgiscreencapsrc.h"
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#include "dxgicapture.h"
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GST_DEBUG_CATEGORY_EXTERN (gst_dxgi_screen_cap_src_debug);
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#define GST_CAT_DEFAULT gst_dxgi_screen_cap_src_debug
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struct _GstDXGIScreenCapSrc
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{
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/* Parent */
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GstPushSrc src;
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/* Properties */
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gint capture_x;
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gint capture_y;
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gint capture_w;
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gint capture_h;
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guint monitor;
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gchar *device_name;
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gboolean show_cursor;
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/* Source pad frame rate */
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gint rate_numerator;
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gint rate_denominator;
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/* Runtime variables */
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RECT screen_rect;
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RECT src_rect;
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guint64 frame_number;
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GstClockID clock_id;
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GstVideoInfo video_info;
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/*DXGI capture */
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DxgiCapture *dxgi_capture;
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};
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static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("BGRA")));
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#define gst_dxgi_screen_cap_src_parent_class parent_class
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G_DEFINE_TYPE (GstDXGIScreenCapSrc, gst_dxgi_screen_cap_src, GST_TYPE_PUSH_SRC);
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#define DEFAULT_MONITOR (-1)
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#define DEFAULT_DEVICE_NAME (NULL)
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#define DEFAULT_SHOW_CURSOR (FALSE)
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#define DEFAULT_X_POS (0)
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#define DEFAULT_Y_POS (0)
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#define DEFAULT_WIDTH (0)
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#define DEFAULT_HEIGHT (0)
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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_DEVICE_NAME,
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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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static void gst_dxgi_screen_cap_src_dispose (GObject * object);
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static void gst_dxgi_screen_cap_src_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec);
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static void gst_dxgi_screen_cap_src_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec);
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static GstCaps *gst_dxgi_screen_cap_src_fixate (GstBaseSrc * bsrc,
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GstCaps * caps);
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static gboolean gst_dxgi_screen_cap_src_set_caps (GstBaseSrc * bsrc,
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GstCaps * caps);
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static GstCaps *gst_dxgi_screen_cap_src_get_caps (GstBaseSrc * bsrc,
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GstCaps * filter);
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static gboolean gst_dxgi_screen_cap_src_start (GstBaseSrc * bsrc);
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static gboolean gst_dxgi_screen_cap_src_stop (GstBaseSrc * bsrc);
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static gboolean gst_dxgi_screen_cap_src_unlock (GstBaseSrc * bsrc);
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static GstFlowReturn gst_dxgi_screen_cap_src_create (GstBaseSrc * pushsrc,
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guint64 offset, guint length, GstBuffer ** buffer);
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static HMONITOR _get_hmonitor (GstDXGIScreenCapSrc * src);
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/* Implementation. */
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static void
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gst_dxgi_screen_cap_src_class_init (GstDXGIScreenCapSrcClass * 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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go_class = G_OBJECT_CLASS (klass);
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e_class = GST_ELEMENT_CLASS (klass);
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bs_class = GST_BASE_SRC_CLASS (klass);
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go_class->set_property = gst_dxgi_screen_cap_src_set_property;
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go_class->get_property = gst_dxgi_screen_cap_src_get_property;
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go_class->dispose = GST_DEBUG_FUNCPTR (gst_dxgi_screen_cap_src_dispose);
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bs_class->get_caps = GST_DEBUG_FUNCPTR (gst_dxgi_screen_cap_src_get_caps);
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bs_class->set_caps = GST_DEBUG_FUNCPTR (gst_dxgi_screen_cap_src_set_caps);
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bs_class->start = GST_DEBUG_FUNCPTR (gst_dxgi_screen_cap_src_start);
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bs_class->stop = GST_DEBUG_FUNCPTR (gst_dxgi_screen_cap_src_stop);
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bs_class->unlock = GST_DEBUG_FUNCPTR (gst_dxgi_screen_cap_src_unlock);
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bs_class->fixate = GST_DEBUG_FUNCPTR (gst_dxgi_screen_cap_src_fixate);
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bs_class->create = GST_DEBUG_FUNCPTR (gst_dxgi_screen_cap_src_create);
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g_object_class_install_property (go_class, PROP_MONITOR,
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g_param_spec_int ("monitor", "Monitor",
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"Which monitor to use (-1 = primary monitor and default)",
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DEFAULT_MONITOR, G_MAXINT, DEFAULT_MONITOR, G_PARAM_READWRITE));
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g_object_class_install_property (go_class, PROP_DEVICE_NAME,
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g_param_spec_string ("device-name", "Monitor device name",
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"Which monitor to use by device name (e.g. \"\\\\\\\\.\\\\DISPLAY1\")",
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DEFAULT_DEVICE_NAME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (go_class, PROP_SHOW_CURSOR,
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g_param_spec_boolean ("cursor",
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"Show mouse cursor",
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"Whether to show mouse cursor (default off)",
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DEFAULT_SHOW_CURSOR, 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, DEFAULT_X_POS, 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, DEFAULT_Y_POS, 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, DEFAULT_WIDTH, 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, DEFAULT_HEIGHT, 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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"DirectX DXGI screen capture source",
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"Source/Video", "Captures screen", "OKADA Jun-ichi <okada@abt.jp>");
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}
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static void
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gst_dxgi_screen_cap_src_init (GstDXGIScreenCapSrc * src)
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{
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/* Set src element inital values... */
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src->capture_x = DEFAULT_X_POS;
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src->capture_y = DEFAULT_Y_POS;
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src->capture_w = DEFAULT_WIDTH;
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src->capture_h = DEFAULT_HEIGHT;
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src->monitor = DEFAULT_MONITOR;
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src->device_name = DEFAULT_DEVICE_NAME;
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src->show_cursor = DEFAULT_SHOW_CURSOR;
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src->dxgi_capture = NULL;
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gst_base_src_set_live (GST_BASE_SRC (src), TRUE);
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gst_base_src_set_format (GST_BASE_SRC (src), GST_FORMAT_TIME);
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}
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static void
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gst_dxgi_screen_cap_src_dispose (GObject * object)
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{
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GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (object);
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g_free (src->device_name);
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src->device_name = NULL;
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dxgicap_destory (src->dxgi_capture);
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src->dxgi_capture = 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_dxgi_screen_cap_src_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec)
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{
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GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (object);
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switch (prop_id) {
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case PROP_MONITOR:
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src->monitor = g_value_get_int (value);
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break;
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case PROP_DEVICE_NAME:
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g_free (src->device_name);
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src->device_name = g_value_dup_string (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_dxgi_screen_cap_src_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (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_DEVICE_NAME:
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g_value_set_string (value, src->device_name);
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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_dxgi_screen_cap_src_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_dxgi_screen_cap_src_set_caps (GstBaseSrc * bsrc, GstCaps * caps)
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{
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GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (bsrc);
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GstStructure *structure;
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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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gst_structure_get_fraction (structure, "framerate",
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&src->rate_numerator, &src->rate_denominator);
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GST_DEBUG_OBJECT (src, "set_caps size %dx%d, %d/%d fps",
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(gint) RECT_WIDTH (src->src_rect),
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(gint) RECT_HEIGHT (src->src_rect),
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src->rate_numerator, src->rate_denominator);
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gst_video_info_from_caps (&src->video_info, caps);
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gst_base_src_set_blocksize (bsrc, GST_VIDEO_INFO_SIZE (&src->video_info));
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return TRUE;
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}
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static GstCaps *
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gst_dxgi_screen_cap_src_get_caps (GstBaseSrc * bsrc, GstCaps * filter)
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{
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GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (bsrc);
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RECT rect_dst;
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GstCaps *caps = NULL;
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HMONITOR hmonitor = _get_hmonitor (src);
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if (!get_monitor_physical_size (hmonitor, &rect_dst)) {
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GST_ELEMENT_ERROR (src, RESOURCE, NOT_FOUND,
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("Specified monitor with index %d not found", src->monitor), (NULL));
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return NULL;
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}
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src->screen_rect = rect_dst;
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if (src->capture_w && src->capture_h &&
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src->capture_x + src->capture_w <= RECT_WIDTH (rect_dst) &&
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src->capture_y + src->capture_h <= RECT_HEIGHT (rect_dst)) {
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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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/* The desktop image is always in the DXGI_FORMAT_B8G8R8A8_UNORM format. */
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GST_DEBUG_OBJECT (src, "get_cap rect: %ld, %ld, %ld, %ld", rect_dst.left,
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rect_dst.top, rect_dst.right, rect_dst.bottom);
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caps =
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gst_caps_new_simple ("video/x-raw", "format", G_TYPE_STRING, "BGRA",
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"width", G_TYPE_INT, RECT_WIDTH (rect_dst),
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"height", G_TYPE_INT, RECT_HEIGHT (rect_dst),
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"framerate", GST_TYPE_FRACTION_RANGE, 1, 1, G_MAXINT,
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1, "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_dxgi_screen_cap_src_start (GstBaseSrc * bsrc)
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{
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GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (bsrc);
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HMONITOR hmonitor = _get_hmonitor (src);
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if (NULL == hmonitor) {
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GST_ELEMENT_ERROR (src, RESOURCE, NOT_FOUND,
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("Specified monitor with index %d not found", src->monitor), (NULL));
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return FALSE;
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}
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src->dxgi_capture = dxgicap_new (hmonitor, src);
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if (NULL == src->dxgi_capture) {
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GST_ELEMENT_ERROR (src, RESOURCE, NOT_FOUND,
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("Specified monitor with index %d not found", src->monitor), (NULL));
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return FALSE;
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}
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dxgicap_start (src->dxgi_capture);
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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_dxgi_screen_cap_src_stop (GstBaseSrc * bsrc)
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{
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GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (bsrc);
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dxgicap_stop (src->dxgi_capture);
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dxgicap_destory (src->dxgi_capture);
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src->dxgi_capture = NULL;
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return TRUE;
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}
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static gboolean
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gst_dxgi_screen_cap_src_unlock (GstBaseSrc * bsrc)
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{
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GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (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_dxgi_screen_cap_src_create (GstBaseSrc * base_src, guint64 offset,
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guint length, GstBuffer ** buf)
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{
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GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (base_src);
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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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GstFlowReturn ret;
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GstBuffer *buffer = NULL;
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if (G_UNLIKELY (!src->dxgi_capture)) {
|
|
GST_DEBUG_OBJECT (src, "format wasn't negotiated before create function");
|
|
return GST_FLOW_NOT_NEGOTIATED;
|
|
}
|
|
|
|
clock = gst_element_get_clock (GST_ELEMENT (src));
|
|
if (clock != NULL) {
|
|
GstClockTime time, base_time;
|
|
|
|
/* Calculate sync time. */
|
|
|
|
time = gst_clock_get_time (clock);
|
|
base_time = gst_element_get_base_time (GST_ELEMENT (src));
|
|
buf_time = time - base_time;
|
|
|
|
if (src->rate_numerator) {
|
|
frame_number = gst_util_uint64_scale (buf_time,
|
|
src->rate_numerator, GST_SECOND * src->rate_denominator);
|
|
} else {
|
|
frame_number = -1;
|
|
}
|
|
} else {
|
|
buf_time = GST_CLOCK_TIME_NONE;
|
|
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;
|
|
GST_OBJECT_UNLOCK (src);
|
|
|
|
if (ret == GST_CLOCK_UNSCHEDULED) {
|
|
/* Got woken up by the unlock function */
|
|
if (clock) {
|
|
gst_object_unref (clock);
|
|
}
|
|
return GST_FLOW_FLUSHING;
|
|
}
|
|
|
|
/* 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;
|
|
|
|
if (clock) {
|
|
gst_object_unref (clock);
|
|
}
|
|
|
|
/* Get the latest desktop frame. */
|
|
do {
|
|
ret = dxgicap_acquire_next_frame (src->dxgi_capture, src->show_cursor, 0);
|
|
if (ret == GST_DXGICAP_FLOW_RESOLUTION_CHANGE) {
|
|
GST_DEBUG_OBJECT (src, "Resolution change detected.");
|
|
|
|
if (!gst_base_src_negotiate (GST_BASE_SRC (src))) {
|
|
return GST_FLOW_NOT_NEGOTIATED;
|
|
}
|
|
}
|
|
} while (ret == GST_DXGICAP_FLOW_RESOLUTION_CHANGE);
|
|
|
|
if (ret != GST_FLOW_OK) {
|
|
return ret;
|
|
}
|
|
|
|
ret =
|
|
GST_BASE_SRC_CLASS (g_type_class_peek_parent (parent_class))->alloc
|
|
(base_src, offset, length, &buffer);
|
|
if (ret != GST_FLOW_OK) {
|
|
return ret;
|
|
}
|
|
|
|
/* Copy the latest desktop frame to the video frame. */
|
|
if (dxgicap_copy_buffer (src->dxgi_capture, src->show_cursor,
|
|
&src->src_rect, &src->video_info, buffer)) {
|
|
GST_BUFFER_TIMESTAMP (buffer) = buf_time;
|
|
GST_BUFFER_DURATION (buffer) = buf_dur;
|
|
*buf = buffer;
|
|
|
|
return GST_FLOW_OK;
|
|
}
|
|
|
|
gst_clear_buffer (&buffer);
|
|
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
|
|
static HMONITOR
|
|
_get_hmonitor (GstDXGIScreenCapSrc * src)
|
|
{
|
|
HMONITOR hmonitor = NULL;
|
|
GST_DEBUG_OBJECT (src, "device_name:%s", GST_STR_NULL (src->device_name));
|
|
if (NULL != src->device_name) {
|
|
hmonitor = get_hmonitor_by_device_name (src->device_name);
|
|
}
|
|
if (NULL == hmonitor && DEFAULT_MONITOR != src->monitor) {
|
|
hmonitor = get_hmonitor_by_index (src->monitor);
|
|
}
|
|
if (NULL == hmonitor) {
|
|
hmonitor = get_hmonitor_primary ();
|
|
}
|
|
return hmonitor;
|
|
}
|
|
|
|
void
|
|
gst_dxgi_screen_cap_src_register (GstPlugin * plugin, GstRank rank)
|
|
{
|
|
if (!IsWindows8OrGreater ()) {
|
|
GST_WARNING ("OS version is too old");
|
|
return;
|
|
}
|
|
|
|
if (!gst_dxgicap_shader_init ()) {
|
|
GST_WARNING ("Couldn't load HLS compiler");
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* element-dxgiscreencapsrc:
|
|
*
|
|
* Since: 1.18
|
|
*/
|
|
gst_element_register (plugin, "dxgiscreencapsrc",
|
|
rank, GST_TYPE_DXGI_SCREEN_CAP_SRC);
|
|
}
|