--- /dev/null
+/* Small helper element for format conversion
+ * Copyright (C) 2005 Tim-Philipp Müller <tim centricular net>
+ * Copyright (C) 2010 Brandon Lewis <brandon.lewis@collabora.co.uk>
+ *
+ * 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 <glib-object.h>
+#include <string.h>
+#include "ges-screenshot.h"
+
+/* FIXME (merge into core): This code is duplicated from gstscreenshot.c and
+ * gstplaysink.c, adapted to handle encoding the converted frame into
+ * arbitrary formats using gst-convenience.
+ */
+
+/* takes ownership of the input buffer */
+GstBuffer *gst_play_frame_conv_convert (GstBuffer * buf, GstCaps * to_caps);
+
+static gboolean
+create_element (const gchar * factory_name, GstElement ** element,
+ GError ** err);
+
+GstBuffer *
+gst_play_sink_convert_frame (GstElement * playsink, GstCaps * caps)
+{
+ GstBuffer *result = NULL;
+
+ g_object_get (G_OBJECT (playsink), "frame", (GstMiniObject *) & result, NULL);
+
+ GST_DEBUG ("got buffer %p from playsink", result);
+
+ if (result != NULL && caps != NULL) {
+ GstBuffer *temp;
+
+ temp = gst_play_frame_conv_convert (result, caps);
+ gst_buffer_unref (result);
+ result = temp;
+ }
+ return result;
+}
+
+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 */
+GstBuffer *
+gst_play_frame_conv_convert (GstBuffer * buf, GstCaps * to_caps)
+{
+ GstElement *src, *csp, *vscale, *sink, *pipeline;
+ GstMessage *msg;
+ GstBuffer *result = NULL;
+ GError *error = NULL;
+ GstBus *bus;
+ GstCaps *from_caps;
+ GstFlowReturn ret;
+
+ from_caps = GST_BUFFER_CAPS (buf);
+
+ g_return_val_if_fail (from_caps != NULL, NULL);
+
+ /* videoscale is here to correct for the pixel-aspect-ratio for us */
+ GST_DEBUG ("creating elements");
+ if (!create_element ("appsrc", &src, &error) ||
+ !create_element ("ffmpegcolorspace", &csp, &error) ||
+ !create_element ("videoscale", &vscale, &error) ||
+ !create_element ("appsink", &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, vscale, sink, NULL);
+
+ /* set caps */
+ g_object_set (src, "caps", from_caps, NULL);
+ g_object_set (sink, "caps", to_caps, 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"))
+ goto link_failed;
+
+ GST_DEBUG ("linking csp->vscale");
+ if (!gst_element_link_pads (csp, "src", vscale, "sink"))
+ goto link_failed;
+
+ GST_DEBUG ("linking vscale->sink");
+ if (!gst_element_link_pads (vscale, "src", sink, "sink"))
+ goto link_failed;
+
+ /* now set the pipeline to the paused state, after we push the buffer into
+ * appsrc, this should preroll the converted buffer in appsink */
+ GST_DEBUG ("running conversion pipeline to caps %" GST_PTR_FORMAT, to_caps);
+ gst_element_set_state (pipeline, GST_STATE_PAUSED);
+
+ /* feed buffer in appsrc */
+ GST_DEBUG ("feeding buffer %p, size %u, caps %" GST_PTR_FORMAT,
+ buf, GST_BUFFER_SIZE (buf), from_caps);
+ g_signal_emit_by_name (src, "push-buffer", buf, &ret);
+
+ /* now see what happens. We either got an error somewhere or the pipeline
+ * prerolled */
+ bus = gst_element_get_bus (pipeline);
+ msg =
+ gst_bus_poll (bus, GST_MESSAGE_ERROR | GST_MESSAGE_ASYNC_DONE,
+ 25 * GST_SECOND);
+
+ if (msg) {
+ switch (GST_MESSAGE_TYPE (msg)) {
+ case GST_MESSAGE_ASYNC_DONE:
+ {
+ /* we're prerolled, get the frame from appsink */
+ g_signal_emit_by_name (sink, "pull-preroll", &result);
+
+ if (result) {
+ GST_DEBUG ("conversion successful: result = %p", result);
+ } else {
+ GST_WARNING ("prerolled 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);
+ break;
+ }
+ default:{
+ g_return_val_if_reached (NULL);
+ }
+ }
+ gst_message_unref (msg);
+ } else {
+ g_warning ("Could not take screenshot: %s", "timeout during conversion");
+ }
+
+ gst_element_set_state (pipeline, GST_STATE_NULL);
+ gst_object_unref (bus);
+ 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;
+ }
+link_failed:
+ {
+ g_warning ("Could not take screenshot: %s", "failed to link elements");
+ gst_object_unref (pipeline);
+ return NULL;
+ }
+}
projects / platform / upstream / gstreamer.git / commitdiff