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ext/gdk_pixbuf/: Add gdkpixbufsink element for easy snapshotting (#525946).

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Original commit message from CVS:
* ext/gdk_pixbuf/Makefile.am:
* ext/gdk_pixbuf/gstgdkpixbuf.c: (plugin_init):
* ext/gdk_pixbuf/gstgdkpixbufsink.c:
(gst_gdk_pixbuf_sink_base_init),
(gst_gdk_pixbuf_sink_class_init), (gst_gdk_pixbuf_sink_init),
(gst_gdk_pixbuf_sink_start), (gst_gdk_pixbuf_sink_stop),
(gst_gdk_pixbuf_sink_set_caps),
(gst_gdk_pixbuf_sink_pixbuf_destroy_notify),
(gst_gdk_pixbuf_sink_get_pixbuf_from_buffer),
(gst_gdk_pixbuf_sink_handle_buffer), (gst_gdk_pixbuf_sink_preroll),
(gst_gdk_pixbuf_sink_render), (gst_gdk_pixbuf_sink_set_property),
(gst_gdk_pixbuf_sink_get_property):
* ext/gdk_pixbuf/gstgdkpixbufsink.h:
Add gdkpixbufsink element for easy snapshotting (#525946).
This commit is contained in:
Tim-Philipp Müller 2008-04-03 22:50:48 +00:00
parent de38811fbe
commit 27f764087c
5 changed files with 525 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
ChangeLog
View file

@ -1,3 +1,20 @@
2008-04-03 Tim-Philipp Müller <tim at centricular dot net>
* ext/gdk_pixbuf/Makefile.am:
* ext/gdk_pixbuf/gstgdkpixbuf.c: (plugin_init):
* ext/gdk_pixbuf/gstgdkpixbufsink.c:
(gst_gdk_pixbuf_sink_base_init),
(gst_gdk_pixbuf_sink_class_init), (gst_gdk_pixbuf_sink_init),
(gst_gdk_pixbuf_sink_start), (gst_gdk_pixbuf_sink_stop),
(gst_gdk_pixbuf_sink_set_caps),
(gst_gdk_pixbuf_sink_pixbuf_destroy_notify),
(gst_gdk_pixbuf_sink_get_pixbuf_from_buffer),
(gst_gdk_pixbuf_sink_handle_buffer), (gst_gdk_pixbuf_sink_preroll),
(gst_gdk_pixbuf_sink_render), (gst_gdk_pixbuf_sink_set_property),
(gst_gdk_pixbuf_sink_get_property):
* ext/gdk_pixbuf/gstgdkpixbufsink.h:
Add gdkpixbufsink element for easy snapshotting (#525946).
2008-04-03 Sebastian Dröge <slomo@circular-chaos.org>
* tests/check/pipelines/wavpack.c: (wavpack_suite):

8
ext/gdk_pixbuf/Makefile.am
View file

@ -1,14 +1,18 @@
plugin_LTLIBRARIES = libgstgdkpixbuf.la
libgstgdkpixbuf_la_SOURCES = gstgdkpixbuf.c pixbufscale.c
libgstgdkpixbuf_la_SOURCES = gstgdkpixbuf.c gstgdkpixbufsink.c pixbufscale.c
libgstgdkpixbuf_la_CFLAGS = \
$(GST_PLUGINS_BASE_CFLAGS) \
$(GST_BASE_CFLAGS) \
$(GST_CFLAGS) $(GTK_CFLAGS)
libgstgdkpixbuf_la_LIBADD = $(GST_BASE_LIBS) $(GST_LIBS) $(GTK_LIBS)
libgstgdkpixbuf_la_LIBADD = \
$(GST_PLUGINS_BASE_LIBS) -lgstvideo-$(GST_MAJORMINOR) \
$(GST_BASE_LIBS) \
$(GST_LIBS) $(GTK_LIBS)
libgstgdkpixbuf_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
noinst_HEADERS = \
gstgdkpixbuf.h \
gstgdkpixbufsink.h \
pixbufscale.h \
gstgdkanimation.h

9
ext/gdk_pixbuf/gstgdkpixbuf.c
View file

@ -22,11 +22,12 @@
#include "config.h"
#endif
#include <gst/gst.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gst/video/video.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <string.h>
#include "gstgdkpixbuf.h"
#include "gstgdkpixbufsink.h"
GST_DEBUG_CATEGORY_STATIC (gst_gdk_pixbuf_debug);
#define GST_CAT_DEFAULT gst_gdk_pixbuf_debug
@ -548,6 +549,10 @@ plugin_init (GstPlugin * plugin)
gst_gdk_pixbuf_type_find, NULL, GST_CAPS_ANY, NULL);
#endif
if (!gst_element_register (plugin, "gdkpixbufsink", GST_RANK_NONE,
GST_TYPE_GDK_PIXBUF_SINK))
return FALSE;
if (!pixbufscale_init (plugin))
return FALSE;
@ -561,5 +566,5 @@ plugin_init (GstPlugin * plugin)
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"gdkpixbuf",
"GDK Pixbuf decoder & scaler",
"GdkPixbuf-based image decoder, scaler and sink",
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)

420
ext/gdk_pixbuf/gstgdkpixbufsink.c Normal file
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@ -0,0 +1,420 @@
/* GStreamer GdkPixbuf sink
* Copyright (C) 2006-2008 Tim-Philipp Müller <tim centricular net>
*
* 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 free software; you can redistribute it and/or
* 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-gdkpixbufsink
* @short_description: video sink that converts RGB images to GdkPixbufs.
* @see_also:
*
* <refsect2>
* <para>
* This sink element takes RGB or RGBA images as input and wraps them into
* GdkPixbuf objects, for easy saving to file via the
* <ulink url="http://library.gnome.org/devel/gdk-pixbuf/unstable/index.html">
* GdkPixbuf library API</ulink> or displaying in Gtk+ applications (e.g. using
* the <ulink url="http://library.gnome.org/devel/gtk/unstable/GtkImage.html">
* GtkImage widget</ulink>).
* </para>
* <para>
* There are two ways to use this element and obtain the GdkPixbuf objects
* created:
* <itemizedlist>
* <listitem>
* Watching for element messages named <classname>&quot;preroll-pixbuf&quot;
* </classname> or <classname>&quot;pixbuf&quot;</classname> on the bus, which
* will be posted whenever an image would usually be rendered. See below for
* more details on these messages and how to extract the pixbuf object
* contained in them.
* </listitem>
* <listitem>
* Retrieving the current pixbuf via the <classname>&quot;last-pixbuf&quot;
* </classname> property when needed.
* </listitem>
* </itemizedlist>
* </para>
* <para>
* The primary purpose of this element is to abstract away the GstBuffer to
* GdkPixbuf conversion. Other than that it's very similar to the fakesink
* element.
* </para>
* <para>
* This element is meant for easy no-hassle video snapshotting. It is not
* suitable for video playback or video display at high framerates. Use
* ximagesink, xvimagesink or some other suitable video sink in connection
* with the GstXOverlay interface instead if you want to do video playback.
* </para>
* <title>Message details</title>
* <para>
* As mentioned above, this element will by default post element messages
* containing structures named <classname>&quot;preroll-pixbuf&quot;
* </classname> or <classname>&quot;pixbuf&quot;</classname> on the bus (this
* can be disabled by setting the
* <link linkend="GstGdkPixbufSink--send-messages">&quot;send-messages&quot;
* property</link> to #FALSE though). The element message&apos;s structure
* will have the following fields:
* <itemizedlist>
* <listitem>
* <classname>&quot;pixbuf&quot;</classname>: the GdkPixbuf object
* </listitem>
* <listitem>
* <classname>&quot;pixel-aspect-ratio&quot;</classname>: the pixel aspect
* ratio (PAR) of the input image (this field contains a #GstFraction); the
* PAR is usually 1:1 for images, but is often something non-1:1 in the case
* of video input. In this case the image may be distorted and you may need
* to rescale it accordingly before saving it to file or displaying it. This
* can easily be done using the
* <ulink url="http://library.gnome.org/devel/gdk-pixbuf/unstable/index.html">
* GdkPixbuf library API</ulink> (the reason this is not done automatically
* is that the application will often scale the image anyway according to the
* size of the output window, in which case it is much more efficient to only
* scale once rather than twice). You can put a videoscale element and a
* capsfilter element with
* <literal>video/x-raw-rgb,pixel-aspect-ratio=(fraction)1/1</literal> caps
* in front of this element to make sure the pixbufs always have a 1:1 PAR.
* </listitem>
* </itemizedlist>
* </para>
* <title>Example pipeline</title>
* <para>
* <programlisting>
* gst-launch -m -v videotestsrc num-buffers=1 ! gdkpixbufsink
* </programlisting>
* Process one single test image as pixbuf (note that the output you see will
* be slightly misleading. The message structure does contain a valid pixbuf
* object even if the structure string says &apos;(NULL)&apos;).
* </para>
* </refsect2>
*
* Since: 0.10.8
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstgdkpixbufsink.h"
#include <gst/video/video.h>
enum
{
PROP_SEND_MESSAGES = 1,
PROP_LAST_PIXBUF
};
#define DEFAULT_SEND_MESSAGES TRUE
GST_BOILERPLATE (GstGdkPixbufSink, gst_gdk_pixbuf_sink, GstVideoSink,
GST_TYPE_VIDEO_SINK);
static void gst_gdk_pixbuf_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_gdk_pixbuf_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_gdk_pixbuf_sink_start (GstBaseSink * basesink);
static gboolean gst_gdk_pixbuf_sink_stop (GstBaseSink * basesink);
static gboolean gst_gdk_pixbuf_sink_set_caps (GstBaseSink * basesink,
GstCaps * caps);
static GstFlowReturn gst_gdk_pixbuf_sink_render (GstBaseSink * bsink,
GstBuffer * buf);
static GstFlowReturn gst_gdk_pixbuf_sink_preroll (GstBaseSink * bsink,
GstBuffer * buf);
static GdkPixbuf *gst_gdk_pixbuf_sink_get_pixbuf_from_buffer (GstGdkPixbufSink *
sink, GstBuffer * buf);
#define WxH ", width = (int) [ 16, 4096 ], height = (int) [ 16, 4096 ]"
static GstStaticPadTemplate pixbufsink_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB WxH ";" GST_VIDEO_CAPS_RGBA WxH));
static void
gst_gdk_pixbuf_sink_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (element_class, "GdkPixbuf sink",
"Sink/Video", "Output images as GdkPixbuf objects in bus messages",
"Tim-Philipp Müller <tim centricular net>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&pixbufsink_sink_factory));
}
static void
gst_gdk_pixbuf_sink_class_init (GstGdkPixbufSinkClass * klass)
{
GstBaseSinkClass *basesink_class = GST_BASE_SINK_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gst_gdk_pixbuf_sink_set_property;
gobject_class->get_property = gst_gdk_pixbuf_sink_get_property;
g_object_class_install_property (gobject_class, PROP_SEND_MESSAGES,
g_param_spec_boolean ("send-messages", "Send Messages",
"Whether to post messages containing pixbufs on the bus",
DEFAULT_SEND_MESSAGES, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_LAST_PIXBUF,
g_param_spec_object ("last-pixbuf", "Last Pixbuf",
"Last GdkPixbuf object rendered", GDK_TYPE_PIXBUF, G_PARAM_READABLE));
basesink_class->start = GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_sink_start);
basesink_class->stop = GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_sink_stop);
basesink_class->render = GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_sink_render);
basesink_class->preroll = GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_sink_preroll);
basesink_class->set_caps = GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_sink_set_caps);
}
static void
gst_gdk_pixbuf_sink_init (GstGdkPixbufSink * sink,
GstGdkPixbufSinkClass * klass)
{
sink->par_n = 0;
sink->par_d = 0;
sink->has_alpha = FALSE;
sink->last_pixbuf = NULL;
sink->send_messages = DEFAULT_SEND_MESSAGES;
/* we're not a real video sink, we just derive from GstVideoSink in case
* anything interesting is added to it in future */
gst_base_sink_set_max_lateness (GST_BASE_SINK (sink), -1);
gst_base_sink_set_qos_enabled (GST_BASE_SINK (sink), FALSE);
}
static gboolean
gst_gdk_pixbuf_sink_start (GstBaseSink * basesink)
{
GST_LOG_OBJECT (basesink, "start");
return TRUE;
}
static gboolean
gst_gdk_pixbuf_sink_stop (GstBaseSink * basesink)
{
GstGdkPixbufSink *sink = GST_GDK_PIXBUF_SINK (basesink);
GST_VIDEO_SINK_WIDTH (sink) = 0;
GST_VIDEO_SINK_HEIGHT (sink) = 0;
sink->par_n = 0;
sink->par_d = 0;
sink->has_alpha = FALSE;
if (sink->last_pixbuf) {
g_object_unref (sink->last_pixbuf);
sink->last_pixbuf = NULL;
}
GST_LOG_OBJECT (sink, "stop");
return TRUE;
}
static gboolean
gst_gdk_pixbuf_sink_set_caps (GstBaseSink * basesink, GstCaps * caps)
{
GstGdkPixbufSink *sink = GST_GDK_PIXBUF_SINK (basesink);
GstVideoFormat fmt;
gint w, h, par_n, par_d;
GST_LOG_OBJECT (sink, "caps: %" GST_PTR_FORMAT, caps);
if (!gst_video_format_parse_caps (caps, &fmt, &w, &h)) {
GST_WARNING_OBJECT (sink, "parse_caps failed");
return FALSE;
}
if (!gst_video_parse_caps_pixel_aspect_ratio (caps, &par_n, &par_d)) {
GST_LOG_OBJECT (sink, "no pixel aspect ratio");
return FALSE;
}
g_assert ((fmt == GST_VIDEO_FORMAT_RGB &&
gst_video_format_get_pixel_stride (fmt, 0) == 3) ||
(fmt == GST_VIDEO_FORMAT_RGBA &&
gst_video_format_get_pixel_stride (fmt, 0) == 4));
GST_VIDEO_SINK_WIDTH (sink) = w;
GST_VIDEO_SINK_HEIGHT (sink) = h;
sink->rowstride = gst_video_format_get_row_stride (fmt, 0, w);
sink->has_alpha = (fmt == GST_VIDEO_FORMAT_RGBA);
sink->par_n = par_n;
sink->par_d = par_d;
GST_INFO_OBJECT (sink, "format : %d", fmt);
GST_INFO_OBJECT (sink, "width x height : %d x %d", w, h);
GST_INFO_OBJECT (sink, "pixel-aspect-ratio : %d/%d", par_d, par_n);
return TRUE;
}
static void
gst_gdk_pixbuf_sink_pixbuf_destroy_notify (guchar * pixels, GstBuffer * buf)
{
gst_buffer_unref (buf);
}
static GdkPixbuf *
gst_gdk_pixbuf_sink_get_pixbuf_from_buffer (GstGdkPixbufSink * sink,
GstBuffer * buf)
{
GdkPixbuf *pix = NULL;
gint minsize, bytes_per_pixel;
g_return_val_if_fail (GST_VIDEO_SINK_WIDTH (sink) > 0, NULL);
g_return_val_if_fail (GST_VIDEO_SINK_HEIGHT (sink) > 0, NULL);
bytes_per_pixel = (sink->has_alpha) ? 4 : 3;
/* last row needn't have row padding */
minsize = (sink->rowstride * (GST_VIDEO_SINK_HEIGHT (sink) - 1)) +
(bytes_per_pixel * GST_VIDEO_SINK_WIDTH (sink));
g_return_val_if_fail (GST_BUFFER_SIZE (buf) >= minsize, NULL);
pix = gdk_pixbuf_new_from_data (GST_BUFFER_DATA (buf),
GDK_COLORSPACE_RGB, sink->has_alpha, 8, GST_VIDEO_SINK_WIDTH (sink),
GST_VIDEO_SINK_HEIGHT (sink), sink->rowstride,
(GdkPixbufDestroyNotify) gst_gdk_pixbuf_sink_pixbuf_destroy_notify,
gst_buffer_ref (buf));
return pix;
}
static GstFlowReturn
gst_gdk_pixbuf_sink_handle_buffer (GstBaseSink * basesink, GstBuffer * buf,
const gchar * msg_name)
{
GstGdkPixbufSink *sink;
GdkPixbuf *pixbuf;
gboolean do_post;
sink = GST_GDK_PIXBUF_SINK (basesink);
pixbuf = gst_gdk_pixbuf_sink_get_pixbuf_from_buffer (sink, buf);
GST_OBJECT_LOCK (sink);
do_post = sink->send_messages;
if (sink->last_pixbuf)
g_object_unref (sink->last_pixbuf);
sink->last_pixbuf = pixbuf; /* take ownership */
GST_OBJECT_UNLOCK (sink);
if (G_UNLIKELY (pixbuf == NULL))
goto error;
if (do_post) {
GstStructure *s;
GstMessage *msg;
/* it's okay to keep using pixbuf here, we can be sure no one is going to
* unref or change sink->last_pixbuf before we return from this function.
* The structure will take its own ref to the pixbuf. */
s = gst_structure_new (msg_name,
"pixbuf", GDK_TYPE_PIXBUF, pixbuf,
"pixel-aspect-ratio", GST_TYPE_FRACTION, sink->par_d, sink->par_n,
NULL);
msg = gst_message_new_element (GST_OBJECT_CAST (sink), s);
gst_element_post_message (GST_ELEMENT_CAST (sink), msg);
}
g_object_notify (G_OBJECT (sink), "last-pixbuf");
return GST_FLOW_OK;
/* ERRORS */
error:
{
/* This shouldn't really happen */
GST_ELEMENT_ERROR (sink, LIBRARY, FAILED,
("Couldn't create pixbuf from RGB image."),
("Probably not enough free memory"));
return GST_FLOW_ERROR;
}
}
static GstFlowReturn
gst_gdk_pixbuf_sink_preroll (GstBaseSink * basesink, GstBuffer * buf)
{
return gst_gdk_pixbuf_sink_handle_buffer (basesink, buf, "preroll-pixbuf");
}
static GstFlowReturn
gst_gdk_pixbuf_sink_render (GstBaseSink * basesink, GstBuffer * buf)
{
return gst_gdk_pixbuf_sink_handle_buffer (basesink, buf, "pixbuf");
}
static void
gst_gdk_pixbuf_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGdkPixbufSink *sink;
sink = GST_GDK_PIXBUF_SINK (object);
switch (prop_id) {
case PROP_SEND_MESSAGES:
GST_OBJECT_LOCK (sink);
sink->send_messages = g_value_get_boolean (value);
GST_OBJECT_UNLOCK (sink);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gdk_pixbuf_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGdkPixbufSink *sink;
sink = GST_GDK_PIXBUF_SINK (object);
switch (prop_id) {
case PROP_SEND_MESSAGES:
GST_OBJECT_LOCK (sink);
g_value_set_boolean (value, sink->send_messages);
GST_OBJECT_UNLOCK (sink);
break;
case PROP_LAST_PIXBUF:
GST_OBJECT_LOCK (sink);
g_value_set_object (value, sink->last_pixbuf);
GST_OBJECT_UNLOCK (sink);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}

75
ext/gdk_pixbuf/gstgdkpixbufsink.h Normal file
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@ -0,0 +1,75 @@
/* GStreamer GdkPixbuf sink
* Copyright (C) 2006-2008 Tim-Philipp Müller <tim centricular net>
*
* 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.
*/
#ifndef GST_GDK_PIXBUF_SINK_H
#define GST_GDK_PIXBUF_SINK_H
#include <gst/gst.h>
#include <gst/video/gstvideosink.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#define GST_TYPE_GDK_PIXBUF_SINK (gst_gdk_pixbuf_sink_get_type())
#define GST_GDK_PIXBUF_SINK(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GDK_PIXBUF_SINK,GstGdkPixbufSink))
#define GST_GDK_PIXBUF_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GDK_PIXBUF_SINK,GstGdkPixbufSinkClass))
#define GST_IS_GDK_PIXBUF_SINK(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GDK_PIXBUF_SINK))
#define GST_IS_GDK_PIXBUF_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GDK_PIXBUF_SINK))
typedef struct _GstGdkPixbufSink GstGdkPixbufSink;
typedef struct _GstGdkPixbufSinkClass GstGdkPixbufSinkClass;
/**
* GstGdkPixbufSink:
*
* Opaque element structure.
*/
struct _GstGdkPixbufSink
{
GstVideoSink basesink;
/*< private >*/
/* current caps */
gint width;
gint height;
gint rowstride;
gint par_n;
gint par_d;
gboolean has_alpha;
/* properties */
gboolean send_messages;
GdkPixbuf * last_pixbuf;
};
/**
* GstGdkPixbufSinkClass:
*
* Opaque element class structure.
*/
struct _GstGdkPixbufSinkClass
{
GstVideoSinkClass basesinkclass;
};
GType gst_gdk_pixbuf_sink_get_type (void);
#endif /* GST_GDK_PIXBUF_SINK_H */