New plugin: winscreencap (#463941).

Original commit message from CVS:
patch by: Haakon Sporsheim <hakon.sporsheim@tandberg.com>
* configure.ac:
* sys/Makefile.am:
* sys/winscreencap/Makefile.am:
* sys/winscreencap/gstdx9screencapsrc.c:
* sys/winscreencap/gstdx9screencapsrc.h:
* sys/winscreencap/gstgdiscreencapsrc.c:
* sys/winscreencap/gstgdiscreencapsrc.h:
* sys/winscreencap/gstwinscreencap.c:
* sys/winscreencap/gstwinscreencap.h:
New plugin: winscreencap (#463941).

1 files changed, 587 insertions, 0 deletions

diff --git a/sys/winscreencap/gstdx9screencapsrc.c b/sys/winscreencap/gstdx9screencapsrc.c
new file mode 100644
index 00000000..e35cb485
--- /dev/null
+++ b/sys/winscreencap/gstdx9screencapsrc.c
@@ -0,0 +1,587 @@
+/* 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstdx9screencapsrc.h"
+#include <gst/video/video.h>
+
+GST_DEBUG_CATEGORY_STATIC (dx9screencapsrc_debug);
+
+static const GstElementDetails gst_dx9screencapsrc_details = {
+  "DirectX 9 screen capture source",
+  "Source/Video",
+  "Captures screen",
+  "Haakon Sporsheim <hakon.sporsheim@tandberg.com>"
+};
+
+#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_pad_template (element_class,
+      gst_static_pad_template_get (&src_template));
+
+  gst_element_class_set_details (element_class, &gst_dx9screencapsrc_details);
+}
+
+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;
+}