--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_base/gst/playback/gstscreenshot.c Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,206 @@
+/* Small helper element for format conversion
+ * Copyright (C) 2005 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/gst.h>
+#include <string.h>
+
+#include "gstscreenshot.h"
+
+static void
+feed_fakesrc (GstElement * src, GstBuffer * buf, GstPad * pad, gpointer data)
+{
+ GstBuffer *in_buf = GST_BUFFER (data);
+
+ gst_buffer_set_caps (buf, GST_BUFFER_CAPS (in_buf));
+
+ memcpy (GST_BUFFER_DATA (buf), GST_BUFFER_DATA (in_buf),
+ GST_BUFFER_SIZE (in_buf));
+
+ GST_BUFFER_SIZE (buf) = GST_BUFFER_SIZE (in_buf);
+
+ GST_DEBUG ("feeding buffer %p, size %u, caps %" GST_PTR_FORMAT,
+ buf, GST_BUFFER_SIZE (buf), GST_BUFFER_CAPS (buf));
+}
+
+static void
+save_result (GstElement * sink, GstBuffer * buf, GstPad * pad, gpointer data)
+{
+ GstBuffer **p_buf = (GstBuffer **) data;
+
+ *p_buf = gst_buffer_ref (buf);
+
+ GST_DEBUG ("received converted buffer %p with caps %" GST_PTR_FORMAT,
+ *p_buf, GST_BUFFER_CAPS (*p_buf));
+}
+
+static gboolean
+create_element (const gchar * factory_name, GstElement ** element,
+ GError ** err)
+{
+ *element = gst_element_factory_make (factory_name, NULL);
+ if (*element)
+ return TRUE;
+
+ if (err && *err == NULL) {
+ *err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_MISSING_PLUGIN,
+ "cannot create element '%s' - please check your GStreamer installation",
+ factory_name);
+ }
+
+ return FALSE;
+}
+
+/* takes ownership of the input buffer */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstBuffer *
+gst_play_frame_conv_convert (GstBuffer * buf, GstCaps * to_caps)
+{
+ GstElement *src, *csp, *filter1, *vscale, *filter2, *sink, *pipeline;
+ GstMessage *msg;
+ GstBuffer *result = NULL;
+ GError *error = NULL;
+ GstBus *bus;
+ GstCaps *to_caps_no_par;
+
+ g_return_val_if_fail (GST_BUFFER_CAPS (buf) != NULL, NULL);
+
+ /* videoscale is here to correct for the pixel-aspect-ratio for us */
+ GST_DEBUG ("creating elements");
+ if (!create_element ("fakesrc", &src, &error) ||
+ !create_element ("ffmpegcolorspace", &csp, &error) ||
+ !create_element ("videoscale", &vscale, &error) ||
+ !create_element ("capsfilter", &filter1, &error) ||
+ !create_element ("capsfilter", &filter2, &error) ||
+ !create_element ("fakesink", &sink, &error))
+ goto no_elements;
+
+ pipeline = gst_pipeline_new ("screenshot-pipeline");
+ if (pipeline == NULL)
+ goto no_pipeline;
+
+ GST_DEBUG ("adding elements");
+ gst_bin_add_many (GST_BIN (pipeline), src, csp, filter1, vscale, filter2,
+ sink, NULL);
+
+ g_signal_connect (src, "handoff", G_CALLBACK (feed_fakesrc), buf);
+
+ /* set to 'fixed' sizetype */
+ g_object_set (src, "sizemax", GST_BUFFER_SIZE (buf), "sizetype", 2,
+ "num-buffers", 1, "signal-handoffs", TRUE, NULL);
+
+ /* adding this superfluous capsfilter makes linking cheaper */
+ to_caps_no_par = gst_caps_copy (to_caps);
+ gst_structure_remove_field (gst_caps_get_structure (to_caps_no_par, 0),
+ "pixel-aspect-ratio");
+ g_object_set (filter1, "caps", to_caps_no_par, NULL);
+ gst_caps_unref (to_caps_no_par);
+
+ g_object_set (filter2, "caps", to_caps, NULL);
+
+ g_signal_connect (sink, "handoff", G_CALLBACK (save_result), &result);
+
+ g_object_set (sink, "preroll-queue-len", 1, "signal-handoffs", TRUE, NULL);
+
+ /* FIXME: linking is still way too expensive, profile this properly */
+ GST_DEBUG ("linking src->csp");
+ if (!gst_element_link_pads (src, "src", csp, "sink"))
+ return NULL;
+
+ GST_DEBUG ("linking csp->filter1");
+ if (!gst_element_link_pads (csp, "src", filter1, "sink"))
+ return NULL;
+
+ GST_DEBUG ("linking filter1->vscale");
+ if (!gst_element_link_pads (filter1, "src", vscale, "sink"))
+ return NULL;
+
+ GST_DEBUG ("linking vscale->capsfilter");
+ if (!gst_element_link_pads (vscale, "src", filter2, "sink"))
+ return NULL;
+
+ GST_DEBUG ("linking capsfilter->sink");
+ if (!gst_element_link_pads (filter2, "src", sink, "sink"))
+ return NULL;
+
+ GST_DEBUG ("running conversion pipeline");
+ gst_element_set_state (pipeline, GST_STATE_PLAYING);
+
+ bus = gst_element_get_bus (pipeline);
+ msg =
+ gst_bus_poll (bus, GST_MESSAGE_ERROR | GST_MESSAGE_EOS, 25 * GST_SECOND);
+
+ if (msg) {
+ switch (GST_MESSAGE_TYPE (msg)) {
+ case GST_MESSAGE_EOS:{
+ if (result) {
+ GST_DEBUG ("conversion successful: result = %p", result);
+ } else {
+ GST_WARNING ("EOS but no result frame?!");
+ }
+ break;
+ }
+ case GST_MESSAGE_ERROR:{
+ gchar *dbg = NULL;
+
+ gst_message_parse_error (msg, &error, &dbg);
+ if (error) {
+ g_warning ("Could not take screenshot: %s", error->message);
+ GST_DEBUG ("%s [debug: %s]", error->message, GST_STR_NULL (dbg));
+ g_error_free (error);
+ } else {
+ g_warning ("Could not take screenshot (and NULL error!)");
+ }
+ g_free (dbg);
+ result = NULL;
+ break;
+ }
+ default:{
+ g_return_val_if_reached (NULL);
+ }
+ }
+ } else {
+ g_warning ("Could not take screenshot: %s", "timeout during conversion");
+ result = NULL;
+ }
+
+ gst_element_set_state (pipeline, GST_STATE_NULL);
+ gst_object_unref (pipeline);
+
+ return result;
+
+ /* ERRORS */
+no_elements:
+ {
+ g_warning ("Could not take screenshot: %s", error->message);
+ g_error_free (error);
+ return NULL;
+ }
+no_pipeline:
+ {
+ g_warning ("Could not take screenshot: %s", "no pipeline (unknown error)");
+ return NULL;
+ }
+}