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gstreamer/sys/ximagesrc/ximagesrc.c
Thomas Vander Stichele 60f8059676 rework build; add translations for v4l2 
Original commit message from CVS:
rework build; add translations for v4l2
2006-04-01 10:09:11 +00:00

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/* GStreamer
*
* 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-ximagesrc
* @short_description: a source that captures your X Display
*
* <refsect2>
* <para>
* This element captures your X Display and creates raw RGB video. It uses
* the XDamage extension if available to only capture areas of the screen that
* have changed since the last frame. It uses the XFixes extension if
* available to also cpature your mouse pointer
* </para>
* <title>Example pipelines</title>
* <para>
* Encode your X display to an Ogg theora video
* </para>
* <programlisting>
* gst-launch -v ximagesrc ! ffmpegcolorspace ! theoraenc ! oggmux ! filesink location=desktop.ogg
* </programlisting>
* <para>
* </refsect2>
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ximagesrc.h"
#include <string.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
GST_DEBUG_CATEGORY_STATIC (gst_debug_ximagesrc);
#define GST_CAT_DEFAULT gst_debug_ximagesrc
/* elementfactory information */
static GstElementDetails ximagesrc_details =
GST_ELEMENT_DETAILS ("Ximage video source",
"Source/Video",
"Creates a screenshot video stream",
"Lutz Mueller <lutz@users.sourceforge.net>"
"Jan Schmidt <thaytan@mad.scientist.com>"
"Zaheer Merali <zaheerabbas at merali dot org>");
static GstStaticPadTemplate t =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-rgb, "
"framerate = (fraction) [ 0, MAX ], "
"width = (int) [ 1, MAX ], " "height = (int) [ 1, MAX ], "
"pixel-aspect-ratio = (fraction) [ 0, MAX ]"));
enum
{
PROP_0,
PROP_DISPLAY_NAME,
PROP_SCREEN_NUM,
PROP_SHOW_POINTER
};
GST_BOILERPLATE (GstXImageSrc, gst_ximagesrc, GstPushSrc, GST_TYPE_PUSH_SRC);
static void gst_ximagesrc_fixate (GstPad * pad, GstCaps * caps);
static void gst_ximagesrc_clear_bufpool (GstXImageSrc * ximagesrc);
/* Called when a buffer is returned from the pipeline */
static void
gst_ximagesrc_return_buf (GstXImageSrc * ximagesrc, GstXImageSrcBuffer * ximage)
{
/* If our geometry changed we can't reuse that image. */
if ((ximage->width != ximagesrc->width) ||
(ximage->height != ximagesrc->height)) {
GST_DEBUG_OBJECT (ximagesrc,
"destroy image %p as its size changed %dx%d vs current %dx%d",
ximage, ximage->width, ximage->height,
ximagesrc->width, ximagesrc->height);
g_mutex_lock (ximagesrc->x_lock);
gst_ximageutil_ximage_destroy (ximagesrc->xcontext, ximage);
g_mutex_unlock (ximagesrc->x_lock);
} else {
/* In that case we can reuse the image and add it to our image pool. */
GST_LOG_OBJECT (ximagesrc, "recycling image %p in pool", ximage);
/* need to increment the refcount again to recycle */
gst_buffer_ref (GST_BUFFER (ximage));
g_mutex_lock (ximagesrc->pool_lock);
ximagesrc->buffer_pool = g_slist_prepend (ximagesrc->buffer_pool, ximage);
g_mutex_unlock (ximagesrc->pool_lock);
}
}
static gboolean
gst_ximagesrc_open_display (GstXImageSrc * s, const gchar * name)
{
g_return_val_if_fail (GST_IS_XIMAGESRC (s), FALSE);
if (s->xcontext != NULL)
return TRUE;
g_mutex_lock (s->x_lock);
s->xcontext = ximageutil_xcontext_get (GST_ELEMENT (s), name);
s->width = s->xcontext->width;
s->height = s->xcontext->height;
/* Always capture root window, for now */
s->xwindow = s->xcontext->root;
#ifdef HAVE_XFIXES
/* check if xfixes supported */
{
int error_base;
if (XFixesQueryExtension (s->xcontext->disp, &s->fixes_event_base,
&error_base)) {
s->have_xfixes = TRUE;
GST_DEBUG_OBJECT (s, "X Server supports XFixes");
} else {
GST_DEBUG_OBJECT (s, "X Server does not support XFixes");
}
}
#ifdef HAVE_XDAMAGE
/* check if xdamage is supported */
{
int error_base;
long evmask = NoEventMask;
if (XDamageQueryExtension (s->xcontext->disp, &s->damage_event_base,
&error_base)) {
s->damage =
XDamageCreate (s->xcontext->disp, s->xwindow,
XDamageReportRawRectangles);
if (s->damage != None) {
s->damage_region = XFixesCreateRegion (s->xcontext->disp, NULL, 0);
if (s->damage_region != None) {
XGCValues values;
GST_DEBUG_OBJECT (s, "Using XDamage extension");
values.subwindow_mode = IncludeInferiors;
s->damage_copy_gc = XCreateGC (s->xcontext->disp,
s->xwindow, GCSubwindowMode, &values);
XSelectInput (s->xcontext->disp, s->xwindow, evmask);
s->have_xdamage = TRUE;
} else {
XDamageDestroy (s->xcontext->disp, s->damage);
s->damage = None;
}
} else
GST_DEBUG_OBJECT (s, "Could not attach to XDamage");
} else {
GST_DEBUG_OBJECT (s, "X Server does not have XDamage extension");
}
}
#endif
#endif
g_mutex_unlock (s->x_lock);
if (s->xcontext == NULL)
return FALSE;
return TRUE;
}
static gboolean
gst_ximagesrc_start (GstBaseSrc * basesrc)
{
GstXImageSrc *s = GST_XIMAGESRC (basesrc);
s->last_frame_no = -1;
return gst_ximagesrc_open_display (s, NULL);
}
static gboolean
gst_ximagesrc_stop (GstBaseSrc * basesrc)
{
GstXImageSrc *src = GST_XIMAGESRC (basesrc);
gst_ximagesrc_clear_bufpool (src);
if (src->xcontext) {
g_mutex_lock (src->x_lock);
ximageutil_xcontext_clear (src->xcontext);
src->xcontext = NULL;
g_mutex_unlock (src->x_lock);
}
return TRUE;
}
static gboolean
gst_ximagesrc_unlock (GstBaseSrc * basesrc)
{
GstXImageSrc *src = GST_XIMAGESRC (basesrc);
/* Awaken the create() func if it's waiting on the clock */
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 gboolean
gst_ximagesrc_recalc (GstXImageSrc * src)
{
if (!src->xcontext)
return FALSE;
/* FIXME: Check the display hasn't changed size or something */
/* We could use XQueryPointer to get only the current window. */
return TRUE;
}
/* ifdeff'ed to prevent warnings of not being used when xfixes not there */
#ifdef HAVE_XFIXES
static void
composite_pixel (GstXContext * xcontext, guchar * dest, guchar * src)
{
guint8 r = src[2];
guint8 g = src[1];
guint8 b = src[0];
guint8 a = src[3];
guint8 dr, dg, db;
guint32 color;
gint r_shift, r_max, r_shift_out;
gint g_shift, g_max, g_shift_out;
gint b_shift, b_max, b_shift_out;
switch (xcontext->bpp) {
case 8:
color = *dest;
break;
case 16:
color = GUINT16_FROM_LE (*(guint32 *) (dest));
break;
case 32:
color = GUINT32_FROM_LE (*(guint32 *) (dest));
break;
default:
g_warning ("bpp %d not supported\n", xcontext->bpp);
color = 0;
}
/* FIXME: move the code that finds shift and max in the _link function */
for (r_shift = 0; !(xcontext->visual->red_mask & (1 << r_shift)); r_shift++);
for (g_shift = 0; !(xcontext->visual->green_mask & (1 << g_shift));
g_shift++);
for (b_shift = 0; !(xcontext->visual->blue_mask & (1 << b_shift)); b_shift++);
for (r_shift_out = 0; !(xcontext->visual->red_mask & (1 << r_shift_out));
r_shift_out++);
for (g_shift_out = 0; !(xcontext->visual->green_mask & (1 << g_shift_out));
g_shift_out++);
for (b_shift_out = 0; !(xcontext->visual->blue_mask & (1 << b_shift_out));
b_shift_out++);
r_max = (xcontext->visual->red_mask >> r_shift);
b_max = (xcontext->visual->blue_mask >> b_shift);
g_max = (xcontext->visual->green_mask >> g_shift);
#define RGBXXX_R(x) (((x)>>r_shift) & (r_max))
#define RGBXXX_G(x) (((x)>>g_shift) & (g_max))
#define RGBXXX_B(x) (((x)>>b_shift) & (b_max))
dr = (RGBXXX_R (color) * 255) / r_max;
dg = (RGBXXX_G (color) * 255) / g_max;
db = (RGBXXX_B (color) * 255) / b_max;
dr = (r * a + (0xff - a) * dr) / 0xff;
dg = (g * a + (0xff - a) * dg) / 0xff;
db = (b * a + (0xff - a) * db) / 0xff;
color = (((dr * r_max) / 255) << r_shift_out) +
(((dg * g_max) / 255) << g_shift_out) +
(((db * b_max) / 255) << b_shift_out);
switch (xcontext->bpp) {
case 8:
*dest = color;
break;
case 16:
*(guint16 *) (dest) = color;
break;
case 32:
*(guint32 *) (dest) = color;
break;
default:
g_warning ("bpp %d not supported\n", xcontext->bpp);
}
}
#endif
/* Retrieve an XImageSrcBuffer, preferably from our
* pool of existing images and populate it from the window */
static GstXImageSrcBuffer *
gst_ximagesrc_ximage_get (GstXImageSrc * ximagesrc)
{
GstXImageSrcBuffer *ximage = NULL;
GstCaps *caps = NULL;
g_mutex_lock (ximagesrc->pool_lock);
while (ximagesrc->buffer_pool != NULL) {
ximage = ximagesrc->buffer_pool->data;
if ((ximage->width != ximagesrc->width) ||
(ximage->height != ximagesrc->height)) {
gst_ximage_buffer_free (ximage);
}
ximagesrc->buffer_pool = g_slist_delete_link (ximagesrc->buffer_pool,
ximagesrc->buffer_pool);
}
g_mutex_unlock (ximagesrc->pool_lock);
if (ximage == NULL) {
GstXContext *xcontext;
GST_DEBUG_OBJECT (ximagesrc, "creating image (%dx%d)",
ximagesrc->width, ximagesrc->height);
g_mutex_lock (ximagesrc->x_lock);
ximage = gst_ximageutil_ximage_new (ximagesrc->xcontext,
GST_ELEMENT (ximagesrc), ximagesrc->width, ximagesrc->height,
(BufferReturnFunc) (gst_ximagesrc_return_buf));
if (ximage == NULL) {
GST_ELEMENT_ERROR (ximagesrc, RESOURCE, WRITE, (NULL),
("could not create a %dx%d ximage", ximage->width, ximage->height));
g_mutex_unlock (ximagesrc->x_lock);
return NULL;
}
xcontext = ximagesrc->xcontext;
caps = gst_caps_new_simple ("video/x-raw-rgb",
"bpp", G_TYPE_INT, xcontext->bpp,
"depth", G_TYPE_INT, xcontext->depth,
"endianness", G_TYPE_INT, xcontext->endianness,
"red_mask", G_TYPE_INT, xcontext->r_mask_output,
"green_mask", G_TYPE_INT, xcontext->g_mask_output,
"blue_mask", G_TYPE_INT, xcontext->b_mask_output,
"width", G_TYPE_INT, xcontext->width,
"height", G_TYPE_INT, xcontext->height,
"framerate", GST_TYPE_FRACTION, ximagesrc->fps_n, ximagesrc->fps_d,
"pixel-aspect-ratio", GST_TYPE_FRACTION,
gst_value_get_fraction_numerator (xcontext->par),
gst_value_get_fraction_denominator (xcontext->par), NULL);
gst_buffer_set_caps (GST_BUFFER (ximage), caps);
g_mutex_unlock (ximagesrc->x_lock);
}
g_return_val_if_fail (GST_IS_XIMAGESRC (ximagesrc), NULL);
#ifdef HAVE_XDAMAGE
if (ximagesrc->have_xdamage) {
XEvent ev;
GST_DEBUG_OBJECT (ximagesrc, "Retrieving screen using XDamage");
do {
XNextEvent (ximagesrc->xcontext->disp, &ev);
if (ev.type == ximagesrc->damage_event_base + XDamageNotify) {
XDamageNotifyEvent *dev = (XDamageNotifyEvent *) & ev;
#ifdef HAVE_XSHM
if (ximagesrc->xcontext->use_xshm &&
dev->area.width == ximagesrc->width &&
dev->area.height == ximagesrc->height) {
GST_DEBUG_OBJECT (ximagesrc, "Entire screen was damaged");
XShmGetImage (ximagesrc->xcontext->disp, ximagesrc->xwindow,
ximage->ximage, 0, 0, AllPlanes);
/* No need to collect more events */
while (XPending (ximagesrc->xcontext->disp)) {
XNextEvent (ximagesrc->xcontext->disp, &ev);
}
break;
} else
#endif
{
GST_LOG_OBJECT (ximagesrc,
"Retrieving damaged sub-region @ %d,%d size %dx%d",
dev->area.x, dev->area.y, dev->area.width, dev->area.height);
XGetSubImage (ximagesrc->xcontext->disp, ximagesrc->xwindow,
dev->area.x, dev->area.y,
dev->area.width, dev->area.height,
AllPlanes, ZPixmap, ximage->ximage, dev->area.x, dev->area.y);
}
}
} while (XPending (ximagesrc->xcontext->disp));
XDamageSubtract (ximagesrc->xcontext->disp, ximagesrc->damage, None, None);
#ifdef HAVE_XFIXES
/* re-get area where last mouse pointer was */
if (ximagesrc->cursor_image) {
gint x, y, width, height;
x = ximagesrc->cursor_image->x - ximagesrc->cursor_image->xhot;
y = ximagesrc->cursor_image->y - ximagesrc->cursor_image->yhot;
width = ximagesrc->cursor_image->width;
height = ximagesrc->cursor_image->height;
/* bounds checking */
if (x < 0)
x = 0;
if (y < 0)
y = 0;
if (x + width > ximagesrc->width)
width = ximagesrc->width - x;
if (y + height > ximagesrc->height)
height = ximagesrc->height - y;
g_assert (x >= 0);
g_assert (y >= 0);
GST_DEBUG_OBJECT (ximagesrc, "Removing cursor from %d,%d", x, y);
XGetSubImage (ximagesrc->xcontext->disp, ximagesrc->xwindow,
x, y, width, height, AllPlanes, ZPixmap, ximage->ximage, x, y);
}
#endif
} else {
#endif
#ifdef HAVE_XSHM
if (ximagesrc->xcontext->use_xshm) {
GST_DEBUG_OBJECT (ximagesrc, "Retrieving screen using XShm");
XShmGetImage (ximagesrc->xcontext->disp, ximagesrc->xwindow,
ximage->ximage, 0, 0, AllPlanes);
} else
#endif /* HAVE_XSHM */
{
GST_DEBUG_OBJECT (ximagesrc, "Retrieving screen using XGetImage");
ximage->ximage = XGetImage (ximagesrc->xcontext->disp, ximagesrc->xwindow,
0, 0, ximagesrc->width, ximagesrc->height, AllPlanes, ZPixmap);
}
#ifdef HAVE_XDAMAGE
}
#endif
#ifdef HAVE_XFIXES
if (ximagesrc->show_pointer && ximagesrc->have_xfixes) {
GST_DEBUG_OBJECT (ximagesrc, "Using XFixes to draw cursor");
/* get cursor */
ximagesrc->cursor_image = XFixesGetCursorImage (ximagesrc->xcontext->disp);
if (ximagesrc->cursor_image != NULL) {
int cx, cy, i, j, count;
cx = ximagesrc->cursor_image->x - ximagesrc->cursor_image->xhot;
cy = ximagesrc->cursor_image->y - ximagesrc->cursor_image->yhot;
//count = image->width * image->height;
count = ximagesrc->cursor_image->width * ximagesrc->cursor_image->height;
for (i = 0; i < count; i++)
ximagesrc->cursor_image->pixels[i] =
GUINT_TO_LE (ximagesrc->cursor_image->pixels[i]);
/* copy those pixels across */
for (j = cy;
j < cy + ximagesrc->cursor_image->height && j < ximagesrc->height;
j++) {
for (i = cx;
i < cx + ximagesrc->cursor_image->width && i < ximagesrc->width;
i++) {
guint8 *src, *dest;
src =
(guint8 *) & (ximagesrc->cursor_image->pixels[((j -
cy) * ximagesrc->cursor_image->width + (i - cx))]);
dest =
(guint8 *) & (ximage->ximage->data[(j * ximagesrc->width +
i) * (ximagesrc->xcontext->bpp / 8)]);
composite_pixel (ximagesrc->xcontext, (guint8 *) dest,
(guint8 *) src);
}
}
}
}
#endif
return ximage;
}
static GstFlowReturn
gst_ximagesrc_create (GstPushSrc * bs, GstBuffer ** buf)
{
GstXImageSrc *s = GST_XIMAGESRC (bs);
GstXImageSrcBuffer *image;
GstClockTime base_time;
GstClockTime next_capture_ts;
GstClockTime dur;
gint64 next_frame_no;
if (!gst_ximagesrc_recalc (s)) {
/* FIXME: Post error on the bus */
return GST_FLOW_ERROR;
}
if (s->fps_n <= 0 || s->fps_d <= 0)
return GST_FLOW_NOT_NEGOTIATED; /* FPS must be > 0 */
/* Now, we might need to wait for the next multiple of the fps
* before capturing */
GST_OBJECT_LOCK (s);
base_time = GST_ELEMENT_CAST (s)->base_time;
next_capture_ts = gst_clock_get_time (GST_ELEMENT_CLOCK (s));
next_capture_ts -= base_time;
/* Figure out which 'frame number' position we're at, based on the cur time
* and frame rate */
next_frame_no = gst_util_uint64_scale (next_capture_ts,
s->fps_n, GST_SECOND * s->fps_d);
if (next_frame_no == s->last_frame_no) {
GstClockID id;
GstClockReturn ret;
/* Need to wait for the next frame */
next_frame_no += 1;
/* Figure out what the next frame time is */
next_capture_ts = gst_util_uint64_scale (next_frame_no,
s->fps_d * GST_SECOND, s->fps_n);
id = gst_clock_new_single_shot_id (GST_ELEMENT_CLOCK (s),
next_capture_ts + base_time);
s->clock_id = id;
/* release the object lock while waiting */
GST_OBJECT_UNLOCK (s);
GST_DEBUG_OBJECT (s, "Waiting for next frame time %" G_GUINT64_FORMAT,
next_capture_ts);
ret = gst_clock_id_wait (id, NULL);
GST_OBJECT_LOCK (s);
gst_clock_id_unref (id);
s->clock_id = NULL;
if (ret == GST_CLOCK_UNSCHEDULED) {
/* Got woken up by the unlock function */
GST_OBJECT_UNLOCK (s);
return GST_FLOW_WRONG_STATE;
}
/* Duration is a complete 1/fps frame duration */
dur = gst_util_uint64_scale_int (GST_SECOND, s->fps_d, s->fps_n);
} else {
GstClockTime next_frame_ts;
GST_DEBUG_OBJECT (s, "No need to wait for next frame time %"
G_GUINT64_FORMAT " next frame = %" G_GINT64_FORMAT " prev = %"
G_GINT64_FORMAT, next_capture_ts, next_frame_no, s->last_frame_no);
next_frame_ts = gst_util_uint64_scale (next_frame_no + 1,
s->fps_d * GST_SECOND, s->fps_n);
/* Frame duration is from now until the next expected capture time */
dur = next_frame_ts - next_capture_ts;
}
s->last_frame_no = next_frame_no;
GST_OBJECT_UNLOCK (s);
image = gst_ximagesrc_ximage_get (s);
if (!image)
return GST_FLOW_ERROR;
*buf = GST_BUFFER (image);
GST_BUFFER_TIMESTAMP (*buf) = next_capture_ts;
GST_BUFFER_DURATION (*buf) = dur;
return GST_FLOW_OK;
}
static void
gst_ximagesrc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstXImageSrc *src = GST_XIMAGESRC (object);
switch (prop_id) {
case PROP_DISPLAY_NAME:
g_free (src->display_name);
src->display_name = g_strdup (g_value_get_string (value));
// src->screen_num = MIN (src->screen_num, ScreenCount (src->display) - 1);
break;
case PROP_SCREEN_NUM:
src->screen_num = g_value_get_uint (value);
// src->screen_num = MIN (src->screen_num, ScreenCount (src->display) - 1);
break;
case PROP_SHOW_POINTER:
src->show_pointer = g_value_get_boolean (value);
break;
default:
break;
}
}
static void
gst_ximagesrc_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstXImageSrc *src = GST_XIMAGESRC (object);
switch (prop_id) {
case PROP_DISPLAY_NAME:
if (src->xcontext)
g_value_set_string (value, DisplayString (src->xcontext->disp));
else
g_value_set_string (value, src->display_name);
break;
case PROP_SCREEN_NUM:
g_value_set_uint (value, src->screen_num);
break;
case PROP_SHOW_POINTER:
g_value_set_boolean (value, src->show_pointer);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_ximagesrc_clear_bufpool (GstXImageSrc * ximagesrc)
{
g_mutex_lock (ximagesrc->pool_lock);
while (ximagesrc->buffer_pool != NULL) {
GstXImageSrcBuffer *ximage = ximagesrc->buffer_pool->data;
gst_ximage_buffer_free (ximage);
ximagesrc->buffer_pool = g_slist_delete_link (ximagesrc->buffer_pool,
ximagesrc->buffer_pool);
}
g_mutex_unlock (ximagesrc->pool_lock);
}
static void
gst_ximagesrc_base_init (gpointer g_class)
{
GstElementClass *ec = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (ec, &ximagesrc_details);
gst_element_class_add_pad_template (ec, gst_static_pad_template_get (&t));
}
static void
gst_ximagesrc_dispose (GObject * object)
{
/* Drop references in the buffer_pool */
gst_ximagesrc_clear_bufpool (GST_XIMAGESRC (object));
}
static void
gst_ximagesrc_finalize (GObject * object)
{
GstXImageSrc *src = GST_XIMAGESRC (object);
if (src->xcontext)
ximageutil_xcontext_clear (src->xcontext);
g_mutex_free (src->pool_lock);
g_mutex_free (src->x_lock);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstCaps *
gst_ximagesrc_get_caps (GstBaseSrc * bs)
{
GstXImageSrc *s = GST_XIMAGESRC (bs);
GstXContext *xcontext;
if ((!s->xcontext) && (!gst_ximagesrc_open_display (s, NULL)))
return gst_caps_copy (gst_pad_get_pad_template_caps (GST_BASE_SRC (s)->
srcpad));
if (!gst_ximagesrc_recalc (s))
return gst_caps_copy (gst_pad_get_pad_template_caps (GST_BASE_SRC (s)->
srcpad));
xcontext = s->xcontext;
return gst_caps_new_simple ("video/x-raw-rgb",
"bpp", G_TYPE_INT, xcontext->bpp,
"depth", G_TYPE_INT, xcontext->depth,
"endianness", G_TYPE_INT, xcontext->endianness,
"red_mask", G_TYPE_INT, xcontext->r_mask_output,
"green_mask", G_TYPE_INT, xcontext->g_mask_output,
"blue_mask", G_TYPE_INT, xcontext->b_mask_output,
"width", G_TYPE_INT, xcontext->width,
"height", G_TYPE_INT, xcontext->height,
"framerate", GST_TYPE_FRACTION_RANGE, 1, G_MAXINT, G_MAXINT, 1,
"pixel-aspect-ratio", GST_TYPE_FRACTION_RANGE, 1, G_MAXINT, G_MAXINT, 1,
NULL);
}
static gboolean
gst_ximagesrc_set_caps (GstBaseSrc * bs, GstCaps * caps)
{
GstXImageSrc *s = GST_XIMAGESRC (bs);
GstStructure *structure;
const GValue *new_fps;
/* If not yet opened, disallow setcaps until later */
if (!s->xcontext)
return FALSE;
/* The only thing that can change is the framerate downstream wants */
structure = gst_caps_get_structure (caps, 0);
new_fps = gst_structure_get_value (structure, "framerate");
if (!new_fps)
return FALSE;
/* Store this FPS for use when generating buffers */
s->fps_n = gst_value_get_fraction_numerator (new_fps);
s->fps_d = gst_value_get_fraction_denominator (new_fps);
GST_DEBUG_OBJECT (s, "peer wants %d/%d fps", s->fps_n, s->fps_d);
return TRUE;
}
static void
gst_ximagesrc_fixate (GstPad * pad, GstCaps * caps)
{
gint i;
GstStructure *structure;
for (i = 0; i < gst_caps_get_size (caps); ++i) {
structure = gst_caps_get_structure (caps, i);
gst_structure_fixate_field_nearest_fraction (structure, "framerate", 25, 1);
}
}
static void
gst_ximagesrc_class_init (GstXImageSrcClass * klass)
{
GObjectClass *gc = G_OBJECT_CLASS (klass);
GstBaseSrcClass *bc = GST_BASE_SRC_CLASS (klass);
GstPushSrcClass *push_class = GST_PUSH_SRC_CLASS (klass);
gc->set_property = gst_ximagesrc_set_property;
gc->get_property = gst_ximagesrc_get_property;
gc->dispose = gst_ximagesrc_dispose;
gc->finalize = gst_ximagesrc_finalize;
g_object_class_install_property (gc, PROP_DISPLAY_NAME,
g_param_spec_string ("display_name", "Display", "X Display name", NULL,
G_PARAM_READWRITE));
g_object_class_install_property (gc, PROP_SCREEN_NUM,
g_param_spec_uint ("screen_num", "Screen number", "X Screen number",
0, G_MAXINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (gc, PROP_SHOW_POINTER,
g_param_spec_boolean ("show_pointer", "Show Mouse Pointer",
"Show mouse pointer if XFixes extension enabled", TRUE,
G_PARAM_READWRITE));
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
push_class->create = gst_ximagesrc_create;
bc->get_caps = gst_ximagesrc_get_caps;
bc->set_caps = gst_ximagesrc_set_caps;
bc->start = gst_ximagesrc_start;
bc->stop = gst_ximagesrc_stop;
bc->unlock = gst_ximagesrc_unlock;
}
static void
gst_ximagesrc_init (GstXImageSrc * ximagesrc, GstXImageSrcClass * klass)
{
gst_base_src_set_live (GST_BASE_SRC (ximagesrc), TRUE);
gst_pad_set_fixatecaps_function (GST_BASE_SRC_PAD (ximagesrc),
gst_ximagesrc_fixate);
ximagesrc->pool_lock = g_mutex_new ();
ximagesrc->x_lock = g_mutex_new ();
ximagesrc->show_pointer = TRUE;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
gboolean ret;
GST_DEBUG_CATEGORY_INIT (gst_debug_ximagesrc, "ximagesrc", 0,
"ximagesrc element debug");
ret = gst_element_register (plugin, "ximagesrc", GST_RANK_NONE,
GST_TYPE_XIMAGESRC);
return ret;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"ximagesrc",
"XFree86 video input plugin based on standard Xlib calls",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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