[gstreamer-bugs] [Bug 345708] New: Example code incorrect / does not compile / Typo
GStreamer (bugzilla.gnome.org)
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Thu Jun 22 16:28:49 PDT 2006
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GStreamer | documentation | Ver: 0.10.6
Summary: Example code incorrect / does not compile / Typo
Product: GStreamer
Version: 0.10.6
Platform: Other
OS/Version: All
Status: UNCONFIRMED
Keywords: documentation
Severity: minor
Priority: Normal
Component: documentation
AssignedTo: gstreamer-bugs at lists.sourceforge.net
ReportedBy: hartmut at gmail.com
QAContact: gstreamer-bugs at lists.sourceforge.net
GNOME version: 2.13/2.14
GNOME milestone: Unspecified
Documentation
Section: III-18 > Data Access
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-dataaccess.html
the example reads:
#include <gst/gst.h>
static gboolean
cb_have_data (GstPad *pad,
GstBuffer *buffer,
gpointer u_data)
{
gint x, y;
guint16 *data = (guint16 *) GST_BUFFER_DATA (buffer), t;
/* invert data */
for (y = 0; y < 288; y++) {
for (x = 0; x < 384 / 2; x++) {
t = data[384 - 1 - x];
data[384 - 1 - x] = data[x];
data[x] = t;
}
data += 384;
}
return TRUE;
}
gint
main (gint argc,
gchar *argv[])
{
GMainLoop *loop;
GstElement *pipeline, *src, *sink, *filter, *csp;
GstCaps *caps;
GstPad *pad;
/* init GStreamer */
gst_init (&argc, &argv);
loop = g_main_loop_new (NULL, FALSE);
/* build */
pipeline = gst_pipeline_new ("my-pipeline");
src = gst_element_factory_make ("videotestsrc", "src");
if (src == NULL)
g_error ("Could not create 'videotestsrc' element");
filter = gst_element_factory_make ("capsfilter", "filter");
g_assert (filer != NULL); /* should always exist */
csp = gst_element_factory_make ("ffmpegcolorspace", "csp");
if (csp == NULL)
g_error ("Could not create 'ffmpegcolorspace' element");
sink = gst_element_factory_make ("xvimagesink", "sink");
if (sink == NULL) {
sink = gst_element_factory_make ("ximagesink", "sink");
if (sink == NULL)
g_error ("Could not create neither 'xvimagesink' nor 'ximagesink'
element");
}
gst_bin_add_many (GST_BIN (pipeline), src, filter, csp, sink, NULL);
gst_element_link_many (src, filter, csp, sink, NULL);
filtercaps = gst_caps_new_simple ("video/x-raw-rgb",
"width", G_TYPE_INT, 384,
"height", G_TYPE_INT, 288,
"framerate", GST_TYPE_FRACTION, 25, 1,
"bpp", G_TYPE_INT, 16,
"depth", G_TYPE_INT, 16,
"endianness", G_TYPE_INT, G_BYTE_ORDER,
NULL);
g_object_set (G_OBJECT (filter), "caps", filtercaps, NULL);
gst_caps_unref (filtercaps);
pad = gst_element_get_pad (src, "src");
gst_pad_add_buffer_probe (pad, G_CALLBACK (cb_have_data), NULL);
gst_object_unref (pad);
/* run */
gst_element_set_state (pipeline, GST_STATE_PLAYING);
/* wait until it's up and running or failed */
if (gst_element_get_state (pipeline, NULL, NULL, -1) ==
GST_STATE_CHANGE_FAILURE) {
g_error ("Failed to go into PLAYING state");
}
g_print ("Running ...\n");
g_main_loop_run (loop);
/* exit */
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
return 0;
}
Correct version:
the example should be:
#include <gst/gst.h>
static gboolean
cb_have_data (GstPad *pad,
GstBuffer *buffer,
gpointer u_data)
{
gint x, y;
guint16 *data = (guint16 *) GST_BUFFER_DATA (buffer), t;
/* invert data */
for (y = 0; y < 288; y++) {
for (x = 0; x < 384 / 2; x++) {
t = data[384 - 1 - x];
data[384 - 1 - x] = data[x];
data[x] = t;
}
data += 384;
}
return TRUE;
}
gint
main (gint argc,
gchar *argv[])
{
GMainLoop *loop;
GstElement *pipeline, *src, *sink, *filter, *csp;
GstCaps *filtercaps;
GstPad *pad;
/* init GStreamer */
gst_init (&argc, &argv);
loop = g_main_loop_new (NULL, FALSE);
/* build */
pipeline = gst_pipeline_new ("my-pipeline");
src = gst_element_factory_make ("videotestsrc", "src");
if (src == NULL)
g_error ("Could not create 'videotestsrc' element");
filter = gst_element_factory_make ("capsfilter", "filter");
g_assert (filter != NULL); /* should always exist */
csp = gst_element_factory_make ("ffmpegcolorspace", "csp");
if (csp == NULL)
g_error ("Could not create 'ffmpegcolorspace' element");
sink = gst_element_factory_make ("xvimagesink", "sink");
if (sink == NULL) {
sink = gst_element_factory_make ("ximagesink", "sink");
if (sink == NULL)
g_error ("Could not create neither 'xvimagesink' nor 'ximagesink'
element");
}
gst_bin_add_many (GST_BIN (pipeline), src, filter, csp, sink, NULL);
gst_element_link_many (src, filter, csp, sink, NULL);
filtercaps = gst_caps_new_simple ("video/x-raw-rgb",
"width", G_TYPE_INT, 384,
"height", G_TYPE_INT, 288,
"framerate", GST_TYPE_FRACTION, 25, 1,
"bpp", G_TYPE_INT, 16,
"depth", G_TYPE_INT, 16,
"endianness", G_TYPE_INT, G_BYTE_ORDER,
NULL);
g_object_set (G_OBJECT (filter), "caps", filtercaps, NULL);
gst_caps_unref (filtercaps);
pad = gst_element_get_pad (src, "src");
gst_pad_add_buffer_probe (pad, G_CALLBACK (cb_have_data), NULL);
gst_object_unref (pad);
/* run */
gst_element_set_state (pipeline, GST_STATE_PLAYING);
/* wait until it's up and running or failed */
if (gst_element_get_state (pipeline, NULL, NULL, -1) ==
GST_STATE_CHANGE_FAILURE) {
g_error ("Failed to go into PLAYING state");
}
g_print ("Running ...\n");
g_main_loop_run (loop);
/* exit */
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
return 0;
}
Other information:
The example above doesn't compile ad hoc. Minor typo. The example in the next
example compiles but does nothing. Need to verify the error there.
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