gstreamer/sys/winscreencap/gstgdiscreencapsrc.c
2017-04-12 12:57:57 -03:00

566 lines
17 KiB
C

/* GStreamer
* Copyright (C) 2007 Haakon Sporsheim <hakon.sporsheim@tandberg.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.
*/
/**
* SECTION:element-gdiscreencapsrc
* @title: gdiscreencapsrc
*
* This element uses GDI to capture the desktop or a portion of it.
* The default is capturing the whole desktop, but #GstGDIScreenCapSrc:x,
* #GstGDIScreenCapSrc:y, #GstGDIScreenCapSrc:width and
* #GstGDIScreenCapSrc:height can be used to select a particular region.
* Use #GstGDIScreenCapSrc:monitor for changing which monitor to capture
* from.
*
* Set #GstGDIScreenCapSrc:cursor to TRUE to include the mouse cursor.
*
* ## Example pipelines
* |[
* gst-launch-1.0 gdiscreencapsrc ! videoconvert ! dshowvideosink
* ]| Capture the desktop and display it.
* |[
* gst-launch-1.0 gdiscreencapsrc x=100 y=100 width=320 height=240 cursor=TRUE
* ! videoconvert ! dshowvideosink
* ]| Capture a portion of the desktop, including the mouse cursor, and
* display it.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstgdiscreencapsrc.h"
#include <gst/video/video.h>
GST_DEBUG_CATEGORY_STATIC (gdiscreencapsrc_debug);
static GstStaticPadTemplate src_template =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("BGR")));
#define gst_gdiscreencapsrc_parent_class parent_class
G_DEFINE_TYPE (GstGDIScreenCapSrc, gst_gdiscreencapsrc, GST_TYPE_PUSH_SRC);
enum
{
PROP_0,
PROP_MONITOR,
PROP_SHOW_CURSOR,
PROP_X_POS,
PROP_Y_POS,
PROP_WIDTH,
PROP_HEIGHT
};
/* Fwd. decl. */
static void gst_gdiscreencapsrc_dispose (GObject * object);
static void gst_gdiscreencapsrc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_gdiscreencapsrc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstCaps *gst_gdiscreencapsrc_fixate (GstBaseSrc * bsrc, GstCaps * caps);
static gboolean gst_gdiscreencapsrc_set_caps (GstBaseSrc * bsrc,
GstCaps * caps);
static GstCaps *gst_gdiscreencapsrc_get_caps (GstBaseSrc * bsrc,
GstCaps * filter);
static gboolean gst_gdiscreencapsrc_start (GstBaseSrc * bsrc);
static gboolean gst_gdiscreencapsrc_unlock (GstBaseSrc * bsrc);
static GstFlowReturn gst_gdiscreencapsrc_create (GstPushSrc * src,
GstBuffer ** buf);
static gboolean gst_gdiscreencapsrc_screen_capture (GstGDIScreenCapSrc * src,
GstBuffer * buf);
/* Implementation. */
static void
gst_gdiscreencapsrc_class_init (GstGDIScreenCapSrcClass * klass)
{
GObjectClass *go_class;
GstElementClass *e_class;
GstBaseSrcClass *bs_class;
GstPushSrcClass *ps_class;
go_class = (GObjectClass *) klass;
e_class = (GstElementClass *) klass;
bs_class = (GstBaseSrcClass *) klass;
ps_class = (GstPushSrcClass *) klass;
go_class->dispose = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_dispose);
go_class->set_property = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_set_property);
go_class->get_property = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_get_property);
bs_class->get_caps = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_get_caps);
bs_class->set_caps = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_set_caps);
bs_class->start = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_start);
bs_class->unlock = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_unlock);
bs_class->fixate = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_fixate);
ps_class->create = GST_DEBUG_FUNCPTR (gst_gdiscreencapsrc_create);
g_object_class_install_property (go_class, PROP_MONITOR,
g_param_spec_int ("monitor",
"Monitor", "Which monitor to use (0 = 1st monitor and default)",
0, G_MAXINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (go_class, PROP_SHOW_CURSOR,
g_param_spec_boolean ("cursor", "Show mouse cursor",
"Whether to show mouse cursor (default off)",
FALSE, G_PARAM_READWRITE));
g_object_class_install_property (go_class, PROP_X_POS,
g_param_spec_int ("x", "X",
"Horizontal coordinate of top left corner for the screen capture "
"area", 0, G_MAXINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (go_class, PROP_Y_POS,
g_param_spec_int ("y", "Y",
"Vertical coordinate of top left corner for the screen capture "
"area", 0, G_MAXINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (go_class, PROP_WIDTH,
g_param_spec_int ("width", "Width",
"Width of screen capture area (0 = maximum)",
0, G_MAXINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (go_class, PROP_HEIGHT,
g_param_spec_int ("height", "Height",
"Height of screen capture area (0 = maximum)",
0, G_MAXINT, 0, G_PARAM_READWRITE));
gst_element_class_add_static_pad_template (e_class, &src_template);
gst_element_class_set_static_metadata (e_class,
"GDI screen capture source", "Source/Video", "Captures screen",
"Haakon Sporsheim <hakon.sporsheim@tandberg.com>");
GST_DEBUG_CATEGORY_INIT (gdiscreencapsrc_debug,
"gdiscreencapsrc", 0, "GDI screen capture source");
}
static void
gst_gdiscreencapsrc_init (GstGDIScreenCapSrc * src)
{
/* Set src element inital values... */
src->dibMem = NULL;
src->hBitmap = (HBITMAP) INVALID_HANDLE_VALUE;
src->memDC = (HDC) INVALID_HANDLE_VALUE;
src->capture_x = 0;
src->capture_y = 0;
src->capture_w = 0;
src->capture_h = 0;
src->monitor = 0;
src->show_cursor = FALSE;
gst_base_src_set_format (GST_BASE_SRC (src), GST_FORMAT_TIME);
gst_base_src_set_live (GST_BASE_SRC (src), TRUE);
}
static void
gst_gdiscreencapsrc_dispose (GObject * object)
{
GstGDIScreenCapSrc *src = GST_GDISCREENCAPSRC (object);
if (src->hBitmap != INVALID_HANDLE_VALUE)
DeleteObject (src->hBitmap);
if (src->memDC != INVALID_HANDLE_VALUE)
DeleteDC (src->memDC);
src->hBitmap = (HBITMAP) INVALID_HANDLE_VALUE;
src->memDC = (HDC) INVALID_HANDLE_VALUE;
src->dibMem = NULL;
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_gdiscreencapsrc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGDIScreenCapSrc *src = GST_GDISCREENCAPSRC (object);
switch (prop_id) {
case PROP_MONITOR:
if (g_value_get_int (value) >= GetSystemMetrics (SM_CMONITORS)) {
G_OBJECT_WARN_INVALID_PSPEC (object, "Monitor", prop_id, pspec);
break;
}
src->monitor = g_value_get_int (value);
break;
case PROP_SHOW_CURSOR:
src->show_cursor = g_value_get_boolean (value);
break;
case PROP_X_POS:
src->capture_x = g_value_get_int (value);
break;
case PROP_Y_POS:
src->capture_y = g_value_get_int (value);
break;
case PROP_WIDTH:
src->capture_w = g_value_get_int (value);
break;
case PROP_HEIGHT:
src->capture_h = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
};
}
static void
gst_gdiscreencapsrc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGDIScreenCapSrc *src = GST_GDISCREENCAPSRC (object);
switch (prop_id) {
case PROP_MONITOR:
g_value_set_int (value, src->monitor);
break;
case PROP_SHOW_CURSOR:
g_value_set_boolean (value, src->show_cursor);
break;
case PROP_X_POS:
g_value_set_int (value, src->capture_x);
break;
case PROP_Y_POS:
g_value_set_int (value, src->capture_y);
break;
case PROP_WIDTH:
g_value_set_int (value, src->capture_w);
break;
case PROP_HEIGHT:
g_value_set_int (value, src->capture_h);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
};
}
static GstCaps *
gst_gdiscreencapsrc_fixate (GstBaseSrc * bsrc, GstCaps * caps)
{
GstStructure *structure;
caps = gst_caps_make_writable (caps);
structure = gst_caps_get_structure (caps, 0);
gst_structure_fixate_field_nearest_int (structure, "width", 640);
gst_structure_fixate_field_nearest_int (structure, "height", 480);
gst_structure_fixate_field_nearest_fraction (structure, "framerate", 30, 1);
caps = GST_BASE_SRC_CLASS (parent_class)->fixate (bsrc, caps);
return caps;
}
static gboolean
gst_gdiscreencapsrc_set_caps (GstBaseSrc * bsrc, GstCaps * caps)
{
GstGDIScreenCapSrc *src = GST_GDISCREENCAPSRC (bsrc);
HWND capture;
HDC device;
GstStructure *structure;
const GValue *framerate;
structure = gst_caps_get_structure (caps, 0);
src->src_rect = src->screen_rect;
if (src->capture_w && src->capture_h) {
src->src_rect.left += src->capture_x;
src->src_rect.top += src->capture_y;
src->src_rect.right = src->src_rect.left + src->capture_w;
src->src_rect.bottom = src->src_rect.top + src->capture_h;
}
framerate = gst_structure_get_value (structure, "framerate");
if (framerate) {
src->rate_numerator = gst_value_get_fraction_numerator (framerate);
src->rate_denominator = gst_value_get_fraction_denominator (framerate);
}
src->info.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
src->info.bmiHeader.biWidth = src->src_rect.right - src->src_rect.left;
src->info.bmiHeader.biHeight = src->src_rect.top - src->src_rect.bottom;
src->info.bmiHeader.biPlanes = 1;
src->info.bmiHeader.biBitCount = 24;
src->info.bmiHeader.biCompression = BI_RGB;
src->info.bmiHeader.biSizeImage = 0;
src->info.bmiHeader.biXPelsPerMeter = 0;
src->info.bmiHeader.biYPelsPerMeter = 0;
src->info.bmiHeader.biClrUsed = 0;
src->info.bmiHeader.biClrImportant = 0;
/* Cleanup first */
if (src->hBitmap != INVALID_HANDLE_VALUE)
DeleteObject (src->hBitmap);
if (src->memDC != INVALID_HANDLE_VALUE)
DeleteDC (src->memDC);
/* Allocate */
capture = GetDesktopWindow ();
device = GetDC (capture);
src->hBitmap = CreateDIBSection (device, &(src->info), DIB_RGB_COLORS,
(void **) &(src->dibMem), 0, 0);
src->memDC = CreateCompatibleDC (device);
SelectObject (src->memDC, src->hBitmap);
ReleaseDC (capture, device);
GST_DEBUG_OBJECT (src, "size %dx%d, %d/%d fps",
(gint) src->info.bmiHeader.biWidth,
(gint) (-src->info.bmiHeader.biHeight),
src->rate_numerator, src->rate_denominator);
return TRUE;
}
static GstCaps *
gst_gdiscreencapsrc_get_caps (GstBaseSrc * bsrc, GstCaps * filter)
{
GstGDIScreenCapSrc *src = GST_GDISCREENCAPSRC (bsrc);
RECT rect_dst;
GstCaps *caps;
src->screen_rect = rect_dst = gst_win32_get_monitor_rect (src->monitor);
if (src->capture_w && src->capture_h &&
src->capture_x + src->capture_w < rect_dst.right - rect_dst.left &&
src->capture_y + src->capture_h < rect_dst.bottom - rect_dst.top) {
rect_dst.left = src->capture_x;
rect_dst.top = src->capture_y;
rect_dst.right = src->capture_x + src->capture_w;
rect_dst.bottom = src->capture_y + src->capture_h;
} else {
/* Default values. */
src->capture_x = src->capture_y = 0;
src->capture_w = src->capture_h = 0;
}
GST_DEBUG ("width = %d, height=%d",
(gint) (rect_dst.right - rect_dst.left),
(gint) (rect_dst.bottom - rect_dst.top));
caps = gst_caps_new_simple ("video/x-raw",
"format", G_TYPE_STRING, "BGR",
"width", G_TYPE_INT, rect_dst.right - rect_dst.left,
"height", G_TYPE_INT, rect_dst.bottom - rect_dst.top,
"framerate", GST_TYPE_FRACTION_RANGE, 1, G_MAXINT, G_MAXINT, 1,
"pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1, NULL);
if (filter) {
GstCaps *tmp =
gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
caps = tmp;
}
return caps;
}
static gboolean
gst_gdiscreencapsrc_start (GstBaseSrc * bsrc)
{
GstGDIScreenCapSrc *src = GST_GDISCREENCAPSRC (bsrc);
src->frame_number = -1;
return TRUE;
}
static gboolean
gst_gdiscreencapsrc_unlock (GstBaseSrc * bsrc)
{
GstGDIScreenCapSrc *src = GST_GDISCREENCAPSRC (bsrc);
GST_OBJECT_LOCK (src);
if (src->clock_id) {
GST_DEBUG_OBJECT (src, "Waking up waiting clock");
gst_clock_id_unschedule (src->clock_id);
}
GST_OBJECT_UNLOCK (src);
return TRUE;
}
static GstFlowReturn
gst_gdiscreencapsrc_create (GstPushSrc * push_src, GstBuffer ** buf)
{
GstGDIScreenCapSrc *src = GST_GDISCREENCAPSRC (push_src);
GstBuffer *new_buf;
gint new_buf_size;
GstClock *clock;
GstClockTime buf_time, buf_dur;
guint64 frame_number;
if (G_UNLIKELY (!src->info.bmiHeader.biWidth ||
!src->info.bmiHeader.biHeight)) {
GST_ELEMENT_ERROR (src, CORE, NEGOTIATION, (NULL),
("format wasn't negotiated before create function"));
return GST_FLOW_NOT_NEGOTIATED;
}
new_buf_size = GST_ROUND_UP_4 (src->info.bmiHeader.biWidth * 3) *
(-src->info.bmiHeader.biHeight);
GST_LOG_OBJECT (src,
"creating buffer of %d bytes with %dx%d image",
new_buf_size, (gint) src->info.bmiHeader.biWidth,
(gint) (-src->info.bmiHeader.biHeight));
new_buf = gst_buffer_new_and_alloc (new_buf_size);
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;
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;
}