/* GStreamer * Copyright (C) 2007 Haakon Sporsheim * * 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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, 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. * * * Example pipelines * |[ * 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. * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "gstdx9screencapsrc.h" #include GST_DEBUG_CATEGORY_STATIC (dx9screencapsrc_debug); #define GST_VIDEO_ALPHA_MASK_15_INT 0x8000 static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-raw-rgb," "width = " GST_VIDEO_SIZE_RANGE "," "height = " GST_VIDEO_SIZE_RANGE "," "framerate = " GST_VIDEO_FPS_RANGE) ); GST_BOILERPLATE (GstDX9ScreenCapSrc, gst_dx9screencapsrc, GstPushSrc, 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 GstCaps *gst_dx9screencapsrc_create_caps_from_format (D3DFORMAT fmt, gint width, gint height); 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 void gst_dx9screencapsrc_fixate (GstPad * pad, GstCaps * caps); static gboolean gst_dx9screencapsrc_set_caps (GstBaseSrc * bsrc, GstCaps * caps); static GstCaps *gst_dx9screencapsrc_get_caps (GstBaseSrc * bsrc); static gboolean gst_dx9screencapsrc_start (GstBaseSrc * bsrc); static gboolean gst_dx9screencapsrc_stop (GstBaseSrc * bsrc); static void gst_dx9screencapsrc_get_times (GstBaseSrc * basesrc, GstBuffer * buffer, GstClockTime * start, GstClockTime * end); static GstFlowReturn gst_dx9screencapsrc_create (GstPushSrc * src, GstBuffer ** buf); /* Implementation. */ static void gst_dx9screencapsrc_base_init (gpointer klass) { GstElementClass *element_class = GST_ELEMENT_CLASS (klass); gst_element_class_add_static_pad_template (element_class, &src_template); gst_element_class_set_details_simple (element_class, "DirectX 9 screen capture source", "Source/Video", "Captures screen", "Haakon Sporsheim "); } static void gst_dx9screencapsrc_class_init (GstDX9ScreenCapSrcClass * klass) { GObjectClass *go_class; GstBaseSrcClass *bs_class; GstPushSrcClass *ps_class; go_class = (GObjectClass *) 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_times = GST_DEBUG_FUNCPTR (gst_dx9screencapsrc_get_times); 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); 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)); GST_DEBUG_CATEGORY_INIT (dx9screencapsrc_debug, "dx9screencapsrc", 0, "DirectX 9 screen capture source"); } static void gst_dx9screencapsrc_init (GstDX9ScreenCapSrc * src, GstDX9ScreenCapSrcClass * klass) { /* Set src element inital values... */ GstPad *src_pad = GST_BASE_SRC_PAD (src); gst_pad_set_fixatecaps_function (src_pad, gst_dx9screencapsrc_fixate); src->frames = 0; 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; } 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; }; } static void gst_dx9screencapsrc_fixate (GstPad * pad, GstCaps * caps) { GstStructure *structure; 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); } 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; } if (framerate = gst_structure_get_value (structure, "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", src->src_rect.right - src->src_rect.left, src->src_rect.bottom - src->src_rect.top, src->rate_numerator, src->rate_denominator); return TRUE; } static GstCaps * gst_dx9screencapsrc_get_caps (GstBaseSrc * bsrc) { GstDX9ScreenCapSrc *src = GST_DX9SCREENCAPSRC (bsrc); RECT rect_dst; 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. */ return gst_dx9screencapsrc_create_caps_from_format (D3DFMT_X8R8G8B8, rect_dst.right - rect_dst.left, rect_dst.bottom - rect_dst.top); } static GstCaps * gst_dx9screencapsrc_create_caps_from_format (D3DFORMAT fmt, gint width, gint height) { gint bpp, depth, endianness; gint red, green, blue, alpha; switch (fmt) { case D3DFMT_A8R8G8B8: bpp = depth = 32; endianness = G_BIG_ENDIAN; alpha = GST_VIDEO_BYTE4_MASK_32_INT; red = GST_VIDEO_BYTE3_MASK_32_INT; green = GST_VIDEO_BYTE2_MASK_32_INT; blue = GST_VIDEO_BYTE1_MASK_32_INT; break; case D3DFMT_X8R8G8B8: bpp = 32; depth = 24; endianness = G_BIG_ENDIAN; alpha = 0; red = GST_VIDEO_BYTE3_MASK_32_INT; green = GST_VIDEO_BYTE2_MASK_32_INT; blue = GST_VIDEO_BYTE1_MASK_32_INT; break; case D3DFMT_R8G8B8: endianness = G_BIG_ENDIAN; bpp = depth = 24; alpha = 0; red = GST_VIDEO_BYTE1_MASK_24_INT; green = GST_VIDEO_BYTE2_MASK_24_INT; blue = GST_VIDEO_BYTE3_MASK_24_INT; break; case D3DFMT_A1R5G5B5: bpp = 16; depth = 15; endianness = G_BYTE_ORDER; alpha = GST_VIDEO_ALPHA_MASK_15_INT; red = GST_VIDEO_RED_MASK_15_INT; green = GST_VIDEO_GREEN_MASK_15_INT; blue = GST_VIDEO_BLUE_MASK_15_INT; break; case D3DFMT_X1R5G5B5: bpp = 16; depth = 15; endianness = G_BYTE_ORDER; alpha = 0; red = GST_VIDEO_RED_MASK_15_INT; green = GST_VIDEO_GREEN_MASK_15_INT; blue = GST_VIDEO_BLUE_MASK_15_INT; break; case D3DFMT_R5G6B5: bpp = depth = 16; endianness = G_BYTE_ORDER; alpha = 0; red = GST_VIDEO_RED_MASK_16_INT; green = GST_VIDEO_GREEN_MASK_16_INT; blue = GST_VIDEO_BLUE_MASK_16_INT; break; default: return NULL; } return gst_caps_new_simple ("video/x-raw-rgb", "width", G_TYPE_INT, width, "height", G_TYPE_INT, height, "framerate", GST_TYPE_FRACTION_RANGE, 1, 1, G_MAXINT, 1, "bpp", G_TYPE_INT, bpp, "depth", G_TYPE_INT, depth, "endianness", G_TYPE_INT, endianness, "alpha_mask", G_TYPE_INT, alpha, "red_mask", G_TYPE_INT, red, "green_mask", G_TYPE_INT, green, "blue_mask", G_TYPE_INT, blue, NULL); } static gboolean gst_dx9screencapsrc_start (GstBaseSrc * bsrc) { GstDX9ScreenCapSrc *src = GST_DX9SCREENCAPSRC (bsrc); D3DPRESENT_PARAMETERS d3dpp; HRESULT res; 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; src->frames = 0; 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 void gst_dx9screencapsrc_get_times (GstBaseSrc * basesrc, GstBuffer * buffer, GstClockTime * start, GstClockTime * end) { GstDX9ScreenCapSrc *src = GST_DX9SCREENCAPSRC (basesrc); GstClockTime timestamp; timestamp = GST_BUFFER_TIMESTAMP (buffer); if (GST_CLOCK_TIME_IS_VALID (timestamp)) { GstClockTime duration = GST_BUFFER_DURATION (buffer); if (GST_CLOCK_TIME_IS_VALID (duration)) *end = timestamp + duration; *start = timestamp; } } static GstFlowReturn gst_dx9screencapsrc_create (GstPushSrc * push_src, GstBuffer ** buf) { GstDX9ScreenCapSrc *src = GST_DX9SCREENCAPSRC (push_src); GstBuffer *new_buf; GstFlowReturn res; gint new_buf_size, i; gint width, height, stride; GstClock *clock; GstClockTime time, buf_time; D3DLOCKED_RECT locked_rect; LPBYTE p_dst, p_src; HRESULT hres; 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) { /* Calculate sync time. */ GstClockTime base_time; GstClockTime frame_time = gst_util_uint64_scale_int (src->frames * GST_SECOND, src->rate_denominator, src->rate_numerator); time = gst_clock_get_time (clock); base_time = gst_element_get_base_time (GST_ELEMENT (src)); buf_time = MAX (time - base_time, frame_time); } else { buf_time = GST_CLOCK_TIME_NONE; } height = (src->src_rect.bottom - src->src_rect.top); width = (src->src_rect.right - src->src_rect.left); new_buf_size = width * 4 * height; if (G_UNLIKELY (src->rate_numerator == 0 && src->frames == 1)) { GST_DEBUG_OBJECT (src, "eos: 0 framerate, frame %d", (gint) src->frames); return GST_FLOW_UNEXPECTED; } GST_LOG_OBJECT (src, "creating buffer of %lu bytes with %dx%d image for frame %d", new_buf_size, width, height, (gint) src->frames); res = gst_pad_alloc_buffer_and_set_caps (GST_BASE_SRC_PAD (src), GST_BUFFER_OFFSET_NONE, new_buf_size, GST_PAD_CAPS (GST_BASE_SRC_PAD (push_src)), &new_buf); if (res != GST_FLOW_OK) { GST_DEBUG_OBJECT (src, "could not allocate buffer, reason %s", gst_flow_get_name (res)); return res; } /* 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."); return GST_FLOW_UNEXPECTED; } 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."); return GST_FLOW_UNEXPECTED; } p_dst = (LPBYTE) GST_BUFFER_DATA (new_buf); 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; } /* Unlock copy of front buffer */ IDirect3DSurface9_UnlockRect (src->surface); GST_BUFFER_TIMESTAMP (new_buf) = buf_time; if (src->rate_numerator) { GST_BUFFER_DURATION (new_buf) = gst_util_uint64_scale_int (GST_SECOND, src->rate_denominator, src->rate_numerator); if (clock) { GST_BUFFER_DURATION (new_buf) = MAX (GST_BUFFER_DURATION (new_buf), gst_clock_get_time (clock) - time); } } else { GST_BUFFER_DURATION (new_buf) = GST_CLOCK_TIME_NONE; } GST_BUFFER_OFFSET (new_buf) = src->frames; src->frames++; GST_BUFFER_OFFSET_END (new_buf) = src->frames; if (clock != NULL) gst_object_unref (clock); *buf = new_buf; return GST_FLOW_OK; }