mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-17 13:56:32 +00:00
df159cbf0d
Original commit message from CVS: Small cleanups
540 lines
15 KiB
C
540 lines
15 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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* 2002 Andy Wingo <wingo@pobox.com>
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*
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* gstparse.c: get a pipeline from a text pipeline description
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <string.h>
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#include "gstparse.h"
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#include "gstinfo.h"
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#include "parse/types.h"
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typedef struct _gst_parse_delayed_pad gst_parse_delayed_pad;
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struct _gst_parse_delayed_pad
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{
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gchar *name;
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GstPad *peer;
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};
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typedef struct
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{
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gchar *srcpadname;
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GstPad *target_pad;
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GstElement *target_element;
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GstElement *pipeline;
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}
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dynamic_connection_t;
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GQuark
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gst_parse_error_quark (void)
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{
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static GQuark quark = 0;
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if (!quark)
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quark = g_quark_from_static_string ("gst_parse_error");
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return quark;
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}
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G_GNUC_UNUSED static void
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dynamic_connect (GstElement * element, GstPad * newpad, gpointer data)
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{
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dynamic_connection_t *dc = (dynamic_connection_t *) data;
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gboolean warn = TRUE;
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/* do we know the exact srcpadname? */
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if (dc->srcpadname) {
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/* see if this is the one */
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if (strcmp (gst_pad_get_name (newpad), dc->srcpadname)) {
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return;
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}
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}
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/* try to find a target pad if we don't know it yet */
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if (!dc->target_pad) {
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if (!GST_PAD_IS_CONNECTED (newpad)) {
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dc->target_pad = gst_element_get_compatible_pad (dc->target_element, newpad);
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warn = FALSE;
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}
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else {
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return;
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}
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}
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if (!GST_PAD_IS_CONNECTED (dc->target_pad) && !GST_PAD_IS_CONNECTED (newpad)) {
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gst_element_set_state (dc->pipeline, GST_STATE_PAUSED);
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if (!gst_pad_connect (newpad, dc->target_pad) && warn) {
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g_warning ("could not connect %s:%s to %s:%s", GST_DEBUG_PAD_NAME (newpad),
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GST_DEBUG_PAD_NAME (dc->target_pad));
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}
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gst_element_set_state (dc->pipeline, GST_STATE_PLAYING);
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}
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}
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static gboolean
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make_elements (graph_t *g, GError **error)
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{
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GList *l = NULL;
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gchar *bin_type;
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element_t *e;
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if (!(g->bins || g->elements)) {
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g_set_error (error,
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GST_PARSE_ERROR,
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GST_PARSE_ERROR_SYNTAX,
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"Empty bin");
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return FALSE;
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}
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if (g->current_bin_type)
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bin_type = g->current_bin_type;
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else
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bin_type = "pipeline";
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if (!(g->bin = gst_element_factory_make (bin_type, NULL))) {
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g_set_error (error,
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GST_PARSE_ERROR,
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GST_PARSE_ERROR_NO_SUCH_ELEMENT,
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"No such bin type %s", bin_type);
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return FALSE;
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}
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l = g->elements;
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while (l) {
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e = (element_t*)l->data;
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if (!(e->element = gst_element_factory_make (e->type, NULL))) {
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g_set_error (error,
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GST_PARSE_ERROR,
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GST_PARSE_ERROR_NO_SUCH_ELEMENT,
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"No such element %s", e->type);
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return FALSE;
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}
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gst_bin_add (GST_BIN (g->bin), e->element);
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l = g_list_next (l);
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}
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l = g->bins;
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while (l) {
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if (!make_elements ((graph_t*)l->data, error))
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return FALSE;
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gst_bin_add (GST_BIN (g->bin), ((graph_t*)l->data)->bin);
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l = g_list_next (l);
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}
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return TRUE;
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}
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static gboolean
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set_properties (graph_t *g, GError **error)
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{
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GList *l, *l2;
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element_t *e;
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property_t *p;
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GParamSpec *pspec;
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l = g->elements;
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while (l) {
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e = (element_t*)l->data;
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l2 = e->property_values;
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while (l2) {
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p = (property_t*)l2->data;
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if ((pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (e->element), p->name))) {
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g_object_set_property (G_OBJECT (e->element), p->name, p->value);
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} else {
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g_set_error (error,
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GST_PARSE_ERROR,
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GST_PARSE_ERROR_NO_SUCH_PROPERTY,
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"No such property '%s' in element '%s'",
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p->name, GST_OBJECT_NAME (GST_OBJECT (e->element)));
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return FALSE;
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}
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l2 = g_list_next (l2);
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}
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l = g_list_next (l);
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}
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l = g->bins;
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while (l) {
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if (!set_properties ((graph_t*)l->data, error))
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return FALSE;
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l = g_list_next (l);
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}
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return TRUE;
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}
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static GstElement*
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find_element_by_index_recurse (graph_t *g, gint i)
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{
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GList *l;
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element_t *e;
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GstElement *element;
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l = g->elements;
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while (l) {
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e = (element_t*)l->data;
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if (e->index == i) {
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return e->element;
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}
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l = g_list_next (l);
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}
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l = g->bins;
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while (l) {
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if ((element = find_element_by_index_recurse ((graph_t*)l->data, i)))
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return element;
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l = g_list_next (l);
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}
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return NULL;
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}
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static GstElement*
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find_element_by_index (graph_t *g, gint i)
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{
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while (g->parent)
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g = g->parent;
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return find_element_by_index_recurse (g, i);
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}
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static gboolean
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make_connections (graph_t *g, GError **error)
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{
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GList *l, *a, *b;
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connection_t *c;
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dynamic_connection_t *dc;
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GstElement *src, *sink;
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GstPad *p1, *p2;
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GstPadTemplate *pt1, *pt2;
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l = g->connections;
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while (l) {
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c = (connection_t*)l->data;
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if (c->src_name) {
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if (!(src = gst_bin_get_by_name (GST_BIN (g->bin), c->src_name))) {
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g_set_error (error,
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GST_PARSE_ERROR,
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GST_PARSE_ERROR_NO_SUCH_ELEMENT,
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"No such element '%s'",
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c->src_name);
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return FALSE;
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}
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} else {
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src = find_element_by_index (g, c->src_index);
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g_assert (src);
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}
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if (c->sink_name) {
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if (!(sink = gst_bin_get_by_name (GST_BIN (g->bin), c->sink_name))) {
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g_set_error (error,
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GST_PARSE_ERROR,
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GST_PARSE_ERROR_NO_SUCH_ELEMENT,
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"No such element '%s'",
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c->sink_name);
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return FALSE;
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}
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} else {
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sink = find_element_by_index (g, c->sink_index);
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g_assert (sink);
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}
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a = c->src_pads;
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b = c->sink_pads;
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/* g_print ("a: %p, b: %p\n", a, b); */
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if (a && b) {
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/* balanced multipad connection */
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while (a && b) {
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p1 = gst_element_get_pad (src, (gchar*)a->data);
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p2 = gst_element_get_pad (sink, (gchar*)b->data);
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if (!p2)
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goto could_not_get_pad_b;
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if (!p1 && p2 && (pt1 = gst_element_get_pad_template (src, (gchar*)a->data)) &&
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pt1->presence == GST_PAD_SOMETIMES) {
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dc = g_new0 (dynamic_connection_t, 1);
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dc->srcpadname = (gchar*)a->data;
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dc->target_pad = p2;
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dc->target_element = sink;
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dc->pipeline = g->bin;
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GST_DEBUG (GST_CAT_PIPELINE, "setting up dynamic connection %s:%s and %s:%s",
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GST_OBJECT_NAME (GST_OBJECT (src)),
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(gchar*)a->data, GST_DEBUG_PAD_NAME (p2));
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g_signal_connect (G_OBJECT (src), "new_pad", G_CALLBACK (dynamic_connect), dc);
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} else if (!p1) {
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goto could_not_get_pad_a;
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} else if (!gst_pad_connect (p1, p2)) {
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goto could_not_connect_pads;
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}
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a = g_list_next (a);
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b = g_list_next (b);
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}
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} else if (a) {
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if ((pt1 = gst_element_get_pad_template (src, (gchar*)a->data))) {
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if ((p1 = gst_element_get_pad (src, (gchar*)a->data)) || pt1->presence == GST_PAD_SOMETIMES) {
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if (!p1) {
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/* sigh, a hack until i fix the gstelement api... */
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if ((pt2 = gst_element_get_compatible_pad_template (sink, pt1))) {
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if ((p2 = gst_element_get_pad (sink, pt2->name_template))) {
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dc = g_new0 (dynamic_connection_t, 1);
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dc->srcpadname = (gchar*)a->data;
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dc->target_pad = p2;
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dc->target_element = NULL;
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dc->pipeline = g->bin;
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GST_DEBUG (GST_CAT_PIPELINE, "setting up dynamic connection %s:%s and %s:%s",
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GST_OBJECT_NAME (GST_OBJECT (src)),
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(gchar*)a->data, GST_DEBUG_PAD_NAME (p2));
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g_signal_connect (G_OBJECT (src), "new_pad", G_CALLBACK (dynamic_connect), dc);
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goto next;
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} else {
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/* both pt1 and pt2 are sometimes templates. sheesh. */
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goto both_templates_have_sometimes_presence;
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}
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} else {
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/* if the target pad has no padtemplate we will figure out a target
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* pad later on */
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dc = g_new0 (dynamic_connection_t, 1);
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dc->srcpadname = NULL;
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dc->target_pad = NULL;
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dc->target_element = sink;
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dc->pipeline = g->bin;
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GST_DEBUG (GST_CAT_PIPELINE, "setting up dynamic connection %s:%s, and some pad in %s",
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GST_OBJECT_NAME (GST_OBJECT (src)),
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(gchar*)a->data, GST_OBJECT_NAME (sink));
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g_signal_connect (G_OBJECT (src), "new_pad", G_CALLBACK (dynamic_connect), dc);
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goto next;
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}
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} else {
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goto could_not_get_compatible_to_a;
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}
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} else {
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goto could_not_get_pad_a;
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}
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} else {
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goto could_not_get_pad_a;
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}
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if (!gst_pad_connect (p1, p2)) {
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goto could_not_connect_pads;
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}
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} else if (b) {
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/* we don't support dynamic connections on this side yet, if ever */
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if (!(p2 = gst_element_get_pad (sink, (gchar*)b->data))) {
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goto could_not_get_pad_b;
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}
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if (!(p1 = gst_element_get_compatible_pad (src, p2))) {
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goto could_not_get_compatible_to_b;
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}
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if (!gst_pad_connect (p1, p2)) {
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goto could_not_connect_pads;
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}
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} else {
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if (!gst_element_connect (src, sink)) {
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goto could_not_connect_elements;
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}
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}
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next:
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l = g_list_next (l);
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}
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l = g->bins;
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while (l) {
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if (!make_connections ((graph_t*)l->data, error))
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return FALSE;
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l = g_list_next (l);
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}
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return TRUE;
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could_not_get_pad_a:
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g_set_error (error,
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GST_PARSE_ERROR,
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GST_PARSE_ERROR_CONNECT,
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"Could not get a pad %s from element %s",
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(gchar*)a->data, GST_OBJECT_NAME (src));
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return FALSE;
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could_not_get_pad_b:
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g_set_error (error,
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GST_PARSE_ERROR,
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GST_PARSE_ERROR_CONNECT,
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"Could not get a pad %s from element %s",
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(gchar*)b->data, GST_OBJECT_NAME (sink));
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return FALSE;
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could_not_get_compatible_to_a:
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g_set_error (error,
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GST_PARSE_ERROR,
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GST_PARSE_ERROR_CONNECT,
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"Could not find a compatible pad in element %s to for %s:%s",
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GST_OBJECT_NAME (sink), GST_OBJECT_NAME (src), (gchar*)a->data);
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return FALSE;
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could_not_get_compatible_to_b:
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g_set_error (error,
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GST_PARSE_ERROR,
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GST_PARSE_ERROR_CONNECT,
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"Could not find a compatible pad in element %s to for %s:%s",
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GST_OBJECT_NAME (src), GST_OBJECT_NAME (sink), (gchar*)b->data);
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return FALSE;
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both_templates_have_sometimes_presence:
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g_set_error (error,
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GST_PARSE_ERROR,
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GST_PARSE_ERROR_CONNECT,
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"Both %s:%s and %s:%s have GST_PAD_SOMETIMES presence, operation not supported",
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GST_OBJECT_NAME (src), pt1->name_template, GST_OBJECT_NAME (sink), pt2->name_template);
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return FALSE;
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could_not_connect_pads:
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g_set_error (error,
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GST_PARSE_ERROR,
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GST_PARSE_ERROR_CONNECT,
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"Could not connect %s:%s to %s:%s",
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GST_DEBUG_PAD_NAME (p1),
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GST_DEBUG_PAD_NAME (p2));
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return FALSE;
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could_not_connect_elements:
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g_set_error (error,
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GST_PARSE_ERROR,
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GST_PARSE_ERROR_CONNECT,
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"Could not connect element %s to %s",
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GST_OBJECT_NAME (src),
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GST_OBJECT_NAME (sink));
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return FALSE;
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}
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static GstBin*
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pipeline_from_graph (graph_t *g, GError **error)
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{
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if (!make_elements (g, error))
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return NULL;
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if (!set_properties (g, error))
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return NULL;
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if (!make_connections (g, error))
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return NULL;
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return (GstBin*)g->bin;
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}
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/**
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* gst_parse_launchv:
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* @argv: null-terminated array of arguments
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*
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* Create a new pipeline based on command line syntax.
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*
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* Returns: a new pipeline on success, NULL on failure
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*/
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GstBin *
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gst_parse_launchv (const gchar **argv, GError **error)
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{
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GstBin *pipeline;
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GString *str;
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const gchar **argvp, *arg;
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gchar *tmp;
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/* let's give it a nice size. */
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str = g_string_sized_new (1024);
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argvp = argv;
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while (*argvp) {
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arg = *argvp;
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tmp = _gst_parse_escape (arg);
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g_string_append (str, tmp);
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g_free (tmp);
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g_string_append (str, " ");
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argvp++;
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}
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pipeline = gst_parse_launch (str->str, error);
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g_string_free (str, TRUE);
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return pipeline;
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}
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gchar *_gst_parse_escape (const gchar *str)
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{
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GString *gstr = NULL;
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g_return_val_if_fail (str != NULL, NULL);
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gstr = g_string_sized_new (strlen (str));
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while (*str) {
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if (*str == ' ')
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g_string_append_c (gstr, '\\');
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g_string_append_c (gstr, *str);
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str++;
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}
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return gstr->str;
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}
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void _gst_parse_unescape (gchar *str)
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{
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gchar *walk;
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g_return_if_fail (str != NULL);
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walk = str;
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while (*walk) {
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if (*walk == '\\')
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walk++;
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*str = *walk;
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str++;
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walk++;
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}
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*str = '\0';
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}
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/**
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* gst_parse_launch:
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* @pipeline_description: the command line describing the pipeline
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*
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* Create a new pipeline based on command line syntax.
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*
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* Returns: a new bin on success, NULL on failure. By default the bin is
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* a GstPipeline, but it depends on the pipeline_description.
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*/
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GstBin *
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gst_parse_launch (const gchar * pipeline_description, GError **error)
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{
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graph_t *graph;
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static GStaticMutex flex_lock = G_STATIC_MUTEX_INIT;
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g_return_val_if_fail (pipeline_description != NULL, NULL);
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GST_INFO (GST_CAT_PIPELINE, "parsing pipeline description %s",
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pipeline_description);
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/* the need for the mutex will go away with flex 2.5.6 */
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g_static_mutex_lock (&flex_lock);
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graph = _gst_parse_launch (pipeline_description, error);
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g_static_mutex_unlock (&flex_lock);
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if (!graph)
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return NULL;
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|
|
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return pipeline_from_graph (graph, error);
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|
}
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