Commit 476fbd3d authored by Wim Taymans's avatar Wim Taymans

Add simple snapshot example program using appsink.

Original commit message from CVS:
* configure.ac:
* tests/examples/Makefile.am:
* tests/examples/snapshot/.cvsignore:
* tests/examples/snapshot/Makefile.am:
* tests/examples/snapshot/snapshot.c: (main):
Add simple snapshot example program using appsink.
parent 0bba976b
2007-09-20 Wim Taymans <wim.taymans@gmail.com>
* configure.ac:
* tests/examples/Makefile.am:
* tests/examples/snapshot/.cvsignore:
* tests/examples/snapshot/Makefile.am:
* tests/examples/snapshot/snapshot.c: (main):
Add simple snapshot example program using appsink.
2007-09-20 Stefan Kost <ensonic@users.sf.net>
* tests/check/generic/states.c:
......@@ -699,6 +699,7 @@ tests/examples/Makefile
tests/examples/dynamic/Makefile
tests/examples/seek/Makefile
tests/examples/volume/Makefile
tests/examples/snapshot/Makefile
tests/icles/Makefile
docs/Makefile
docs/design/Makefile
......
if HAVE_FT2
FT2_SUBDIRS = seek
FT2_SUBDIRS = seek snapshot
else
FT2_SUBDIRS =
endif
SUBDIRS = $(FT2_SUBDIRS) volume dynamic
DIST_SUBDIRS = seek volume dynamic
DIST_SUBDIRS = seek volume dynamic snapshot
if HAVE_GTK
GTK_EXAMPLES=snapshot
endif
examples = $(GTK_EXAMPLES)
noinst_PROGRAMS = $(examples)
LIBS = $(GST_LIBS) $(GTK_LIBS)
AM_CFLAGS = $(GST_CFLAGS) $(GTK_CFLAGS)
/* GStreamer snapshot example
* Copyright (C) <2007> Wim Taymans <wim.taymans@gmail.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.
*/
#include <gst/gst.h>
#include <gtk/gtk.h>
#define CAPS "video/x-raw-rgb,width=160,pixel-aspect-ratio=1/1,bpp=(int)24,depth=(int)24,endianness=(int)4321,red_mask=(int)0xff0000, green_mask=(int)0x00ff00, blue_mask=(int)0x0000ff"
int
main (int argc, char *argv[])
{
GstElement *pipeline, *sink;
gint width, height;
GstBuffer *buffer;
gchar *descr;
GError *error = NULL;
GdkPixbuf *pixbuf;
gint64 duration, position;
GstFormat format;
GstStateChangeReturn ret;
gboolean res;
gst_init (&argc, &argv);
if (argc != 2) {
g_print ("usage: %s <uri>\n Writes snapshot.png in the current directory",
argv[0]);
exit (-1);
}
/* create a new pipeline */
descr =
g_strdup_printf ("uridecodebin uri=%s ! ffmpegcolorspace ! videoscale ! "
" appsink name=sink caps=\"" CAPS "\"", argv[1]);
pipeline = gst_parse_launch (descr, &error);
g_assert (error == NULL);
/* get sink */
sink = gst_bin_get_by_name (GST_BIN (pipeline), "sink");
/* set to PAUSED to make the first frame arrive in the sink */
ret = gst_element_set_state (pipeline, GST_STATE_PAUSED);
switch (ret) {
case GST_STATE_CHANGE_FAILURE:
g_print ("failed to play the file\n");
exit (-1);
case GST_STATE_CHANGE_NO_PREROLL:
/* for live sources, we need to set the pipeline to PLAYING before we can
* receive a buffer. We don't do that yet */
g_print ("live sources not supported yet\n");
exit (-1);
default:
break;
}
/* This can block for up to 5 seconds. If your machine is really overloaded,
* it might time out before the pipeline prerolled and we generate an error. A
* better way is to run a mainloop and catch errors there. */
ret = gst_element_get_state (pipeline, NULL, NULL, 5 * GST_SECOND);
if (ret == GST_STATE_CHANGE_FAILURE) {
g_print ("failed to play the file\n");
exit (-1);
}
/* get the duration */
format = GST_FORMAT_TIME;
gst_element_query_duration (pipeline, &format, &duration);
if (duration != -1)
/* we have a duration, seek to 5% */
position = duration * 5 / 100;
else
/* no duration, seek to 1 second, this could EOS */
position = 1 * GST_SECOND;
/* seek to the a position in the file. Most files have a black first frame so
* by seeking to somewhere else we have a bigger chance of getting something
* more interesting. An optimisation would be to detect black images and then
* seek a little more */
gst_element_seek_simple (pipeline, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH,
position);
/* get the preroll buffer from appsink, this block untils appsink really
* prerolls */
g_signal_emit_by_name (sink, "pull-preroll", &buffer, NULL);
/* if we have a buffer now, convert it to a pixbuf. It's possible that we
* don't have a buffer because we went EOS right away or had an error. */
if (buffer) {
GstCaps *caps;
GstStructure *s;
/* get the snapshot buffer format now. We set the caps on the appsink so
* that it can only be an rgb buffer. The only thing we have not specified
* on the caps is the height, which is dependant on the pixel-aspect-ratio
* of the source material */
caps = GST_BUFFER_CAPS (buffer);
if (!caps) {
g_print ("could not get snapshot format\n");
exit (-1);
}
s = gst_caps_get_structure (caps, 0);
/* we need to get the final caps on the buffer to get the size */
res = gst_structure_get_int (s, "width", &width);
res |= gst_structure_get_int (s, "height", &height);
if (!res) {
g_print ("could not get snapshot dimension\n");
exit (-1);
}
/* create pixmap from buffer and save, gstreamer video buffers have a stride
* that is rounded up to the nearest multiple of 4 */
pixbuf = gdk_pixbuf_new_from_data (GST_BUFFER_DATA (buffer),
GDK_COLORSPACE_RGB, FALSE, 8, width, height,
GST_ROUND_UP_4 (width * 3), NULL, NULL);
/* save the pixbuf */
gdk_pixbuf_save (pixbuf, "snapshot.png", "png", &error, NULL);
} else {
g_print ("could not make snapshot\n");
}
/* cleanup and exit */
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
exit (0);
}
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment