gstreamer/sys/winscreencap/gstdx9screencapsrc.c

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/* 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-dx9screencapsrc
*
* This element uses DirectX to capture the desktop or a portion of it.
* The default is capturing the whole desktop, but #GstDX9ScreenCapSrc:x,
* #GstDX9ScreenCapSrc:y, #GstDX9ScreenCapSrc:width and
* #GstDX9ScreenCapSrc:height can be used to select a particular region.
* Use #GstDX9ScreenCapSrc:monitor for changing which monitor to capture
* from.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch dx9screencapsrc ! ffmpegcolorspace ! dshowvideosink
* ]| Capture the desktop and display it.
* |[
* gst-launch dx9screencapsrc x=100 y=100 width=320 height=240 !
* ffmpegcolorspace ! dshowvideosink
* ]| Capture a portion of the desktop and display it.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstdx9screencapsrc.h"
#include <gst/video/video.h>
GST_DEBUG_CATEGORY_STATIC (dx9screencapsrc_debug);
static GstStaticPadTemplate src_template = 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_dx9screencapsrc_parent_class parent_class
G_DEFINE_TYPE (GstDX9ScreenCapSrc, gst_dx9screencapsrc, GST_TYPE_PUSH_SRC);
enum
{
PROP_0,
PROP_MONITOR,
PROP_X_POS,
PROP_Y_POS,
PROP_WIDTH,
PROP_HEIGHT
};
static IDirect3D9 *g_d3d9 = NULL;
/* Fwd. decl. */
static void gst_dx9screencapsrc_dispose (GObject * object);
static void gst_dx9screencapsrc_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_dx9screencapsrc_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static GstCaps *gst_dx9screencapsrc_fixate (GstBaseSrc * bsrc, GstCaps * caps);
static gboolean gst_dx9screencapsrc_set_caps (GstBaseSrc * bsrc,
GstCaps * caps);
static GstCaps *gst_dx9screencapsrc_get_caps (GstBaseSrc * bsrc,
GstCaps * filter);
static gboolean gst_dx9screencapsrc_start (GstBaseSrc * bsrc);
static gboolean gst_dx9screencapsrc_stop (GstBaseSrc * bsrc);
static gboolean gst_dx9screencapsrc_unlock (GstBaseSrc * bsrc);
static GstFlowReturn gst_dx9screencapsrc_create (GstPushSrc * src,
GstBuffer ** buf);
/* Implementation. */
static void
gst_dx9screencapsrc_class_init (GstDX9ScreenCapSrcClass * klass)
{
GObjectClass *go_class;
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GstElementClass *e_class;
GstBaseSrcClass *bs_class;
GstPushSrcClass *ps_class;
go_class = (GObjectClass *) klass;
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e_class = (GstElementClass *) klass;
bs_class = (GstBaseSrcClass *) klass;
ps_class = (GstPushSrcClass *) klass;
go_class->dispose = GST_DEBUG_FUNCPTR (gst_dx9screencapsrc_dispose);
go_class->set_property = GST_DEBUG_FUNCPTR (gst_dx9screencapsrc_set_property);
go_class->get_property = GST_DEBUG_FUNCPTR (gst_dx9screencapsrc_get_property);
bs_class->get_caps = GST_DEBUG_FUNCPTR (gst_dx9screencapsrc_get_caps);
bs_class->set_caps = GST_DEBUG_FUNCPTR (gst_dx9screencapsrc_set_caps);
bs_class->start = GST_DEBUG_FUNCPTR (gst_dx9screencapsrc_start);
bs_class->stop = GST_DEBUG_FUNCPTR (gst_dx9screencapsrc_stop);
bs_class->unlock = GST_DEBUG_FUNCPTR (gst_dx9screencapsrc_unlock);
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bs_class->fixate = GST_DEBUG_FUNCPTR (gst_dx9screencapsrc_fixate);
ps_class->create = GST_DEBUG_FUNCPTR (gst_dx9screencapsrc_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_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));
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gst_element_class_add_pad_template (e_class,
gst_static_pad_template_get (&src_template));
gst_element_class_set_static_metadata (e_class,
"DirectX 9 screen capture source", "Source/Video", "Captures screen",
"Haakon Sporsheim <hakon.sporsheim@tandberg.com>");
GST_DEBUG_CATEGORY_INIT (dx9screencapsrc_debug, "dx9screencapsrc", 0,
"DirectX 9 screen capture source");
}
static void
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gst_dx9screencapsrc_init (GstDX9ScreenCapSrc * src)
{
/* Set src element inital values... */
src->surface = NULL;
src->d3d9_device = NULL;
src->capture_x = 0;
src->capture_y = 0;
src->capture_w = 0;
src->capture_h = 0;
src->monitor = 0;
gst_base_src_set_format (GST_BASE_SRC (src), GST_FORMAT_TIME);
gst_base_src_set_live (GST_BASE_SRC (src), TRUE);
if (!g_d3d9)
g_d3d9 = Direct3DCreate9 (D3D_SDK_VERSION);
else
IDirect3D9_AddRef (g_d3d9);
}
static void
gst_dx9screencapsrc_dispose (GObject * object)
{
GstDX9ScreenCapSrc *src = GST_DX9SCREENCAPSRC (object);
if (src->surface) {
GST_ERROR_OBJECT (object,
"DX9 surface was not freed in _stop, freeing in _dispose!");
IDirect3DSurface9_Release (src->surface);
src->surface = NULL;
}
if (src->d3d9_device) {
IDirect3DDevice9_Release (src->d3d9_device);
src->d3d9_device = NULL;
}
if (!IDirect3D9_Release (g_d3d9))
g_d3d9 = NULL;
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G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_dx9screencapsrc_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstDX9ScreenCapSrc *src = GST_DX9SCREENCAPSRC (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_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_dx9screencapsrc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstDX9ScreenCapSrc *src = GST_DX9SCREENCAPSRC (object);
switch (prop_id) {
case PROP_MONITOR:
g_value_set_int (value, src->monitor);
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;
};
}
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static GstCaps *
gst_dx9screencapsrc_fixate (GstBaseSrc * bsrc, GstCaps * caps)
{
GstStructure *structure;
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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);
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caps = GST_BASE_SRC_CLASS (parent_class)->fixate (bsrc, caps);
return caps;
}
static gboolean
gst_dx9screencapsrc_set_caps (GstBaseSrc * bsrc, GstCaps * caps)
{
GstDX9ScreenCapSrc *src = GST_DX9SCREENCAPSRC (bsrc);
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);
}
GST_DEBUG_OBJECT (src, "size %dx%d, %d/%d fps",
(gint) (src->src_rect.right - src->src_rect.left),
(gint) (src->src_rect.bottom - src->src_rect.top),
src->rate_numerator, src->rate_denominator);
return TRUE;
}
static GstCaps *
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gst_dx9screencapsrc_get_caps (GstBaseSrc * bsrc, GstCaps * filter)
{
GstDX9ScreenCapSrc *src = GST_DX9SCREENCAPSRC (bsrc);
RECT rect_dst;
GstCaps *caps;
if (src->monitor >= IDirect3D9_GetAdapterCount (g_d3d9) ||
FAILED (IDirect3D9_GetAdapterDisplayMode (g_d3d9, src->monitor,
&src->disp_mode))) {
return NULL;
}
SetRect (&rect_dst, 0, 0, src->disp_mode.Width, src->disp_mode.Height);
src->screen_rect = rect_dst;
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;
}
/* Note:
* Expose as xRGB even though the Surface is allocated as ARGB!
* This is due to IDirect3DDevice9_GetFrontBufferData which only takes
* ARGB surface, but the A channel is in reality never used.
* I should add that I had problems specifying ARGB. It might be a bug
* in ffmpegcolorspace which I used for testing.
* Another interesting thing is that directdrawsink did not support ARGB,
* but only xRGB. (On my system, using 32b color depth) And according to
* the DirectX documentation ARGB is NOT a valid display buffer format,
* but xRGB is.
*/
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caps = gst_caps_new_simple ("video/x-raw",
"format", G_TYPE_STRING, "BGRx",
"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, 1, G_MAXINT, 1,
"pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1, NULL);
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if (filter) {
GstCaps *tmp =
gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
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gst_caps_unref (caps);
caps = tmp;
}
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return caps;
}
static gboolean
gst_dx9screencapsrc_start (GstBaseSrc * bsrc)
{
GstDX9ScreenCapSrc *src = GST_DX9SCREENCAPSRC (bsrc);
D3DPRESENT_PARAMETERS d3dpp;
HRESULT res;
src->frame_number = -1;
ZeroMemory (&d3dpp, sizeof (D3DPRESENT_PARAMETERS));
d3dpp.Windowed = TRUE;
d3dpp.Flags = D3DPRESENTFLAG_LOCKABLE_BACKBUFFER;
d3dpp.BackBufferFormat = src->disp_mode.Format;
d3dpp.BackBufferHeight = src->disp_mode.Height;
d3dpp.BackBufferWidth = src->disp_mode.Width;
d3dpp.BackBufferCount = 1;
d3dpp.MultiSampleType = D3DMULTISAMPLE_NONE;
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dpp.hDeviceWindow = GetDesktopWindow ();
d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_DEFAULT;
d3dpp.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;
res = IDirect3D9_CreateDevice (g_d3d9, src->monitor, D3DDEVTYPE_HAL,
GetDesktopWindow (), D3DCREATE_SOFTWARE_VERTEXPROCESSING,
&d3dpp, &src->d3d9_device);
if (FAILED (res))
return FALSE;
return
SUCCEEDED (IDirect3DDevice9_CreateOffscreenPlainSurface (src->d3d9_device,
src->disp_mode.Width, src->disp_mode.Height, D3DFMT_A8R8G8B8,
D3DPOOL_SYSTEMMEM, &src->surface, NULL));
}
static gboolean
gst_dx9screencapsrc_stop (GstBaseSrc * bsrc)
{
GstDX9ScreenCapSrc *src = GST_DX9SCREENCAPSRC (bsrc);
if (src->surface) {
IDirect3DSurface9_Release (src->surface);
src->surface = NULL;
}
return TRUE;
}
static gboolean
gst_dx9screencapsrc_unlock (GstBaseSrc * bsrc)
{
GstDX9ScreenCapSrc *src = GST_DX9SCREENCAPSRC (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_dx9screencapsrc_create (GstPushSrc * push_src, GstBuffer ** buf)
{
GstDX9ScreenCapSrc *src = GST_DX9SCREENCAPSRC (push_src);
GstBuffer *new_buf;
gint new_buf_size, i;
gint width, height, stride;
GstClock *clock;
GstClockTime buf_time, buf_dur;
D3DLOCKED_RECT locked_rect;
LPBYTE p_dst, p_src;
HRESULT hres;
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GstMapInfo map;
guint64 frame_number;
if (G_UNLIKELY (!src->d3d9_device)) {
GST_ELEMENT_ERROR (src, CORE, NEGOTIATION, (NULL),
("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;
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;
height = (src->src_rect.bottom - src->src_rect.top);
width = (src->src_rect.right - src->src_rect.left);
new_buf_size = width * 4 * height;
GST_LOG_OBJECT (src,
"creating buffer of %d bytes with %dx%d image",
new_buf_size, width, height);
/* Do screen capture and put it into buffer...
* Aquire front buffer, and lock it
*/
hres =
IDirect3DDevice9_GetFrontBufferData (src->d3d9_device, 0, src->surface);
if (FAILED (hres)) {
GST_DEBUG_OBJECT (src, "DirectX::GetBackBuffer failed.");
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return GST_FLOW_ERROR;
}
hres =
IDirect3DSurface9_LockRect (src->surface, &locked_rect, &(src->src_rect),
D3DLOCK_NO_DIRTY_UPDATE | D3DLOCK_NOSYSLOCK | D3DLOCK_READONLY);
if (FAILED (hres)) {
GST_DEBUG_OBJECT (src, "DirectX::LockRect failed.");
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return GST_FLOW_ERROR;
}
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new_buf = gst_buffer_new_and_alloc (new_buf_size);
gst_buffer_map (new_buf, &map, GST_MAP_WRITE);
p_dst = (LPBYTE) map.data;
p_src = (LPBYTE) locked_rect.pBits;
stride = width * 4;
for (i = 0; i < height; ++i) {
memcpy (p_dst, p_src, stride);
p_dst += stride;
p_src += locked_rect.Pitch;
}
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gst_buffer_unmap (new_buf, &map);
/* Unlock copy of front buffer */
IDirect3DSurface9_UnlockRect (src->surface);
GST_BUFFER_TIMESTAMP (new_buf) = buf_time;
GST_BUFFER_DURATION (new_buf) = buf_dur;
if (clock != NULL)
gst_object_unref (clock);
*buf = new_buf;
return GST_FLOW_OK;
}