mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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18132911b4
Original commit message from CVS: * docs/gst/gstreamer-sections.txt: * gst/gstutils.c: (gst_pad_query_peer_position), (gst_pad_query_peer_duration), (gst_pad_query_peer_convert): * gst/gstutils.h: API: add some new utility functions: - gst_pad_query_peer_position - gst_pad_query_peer_duration - gst_pad_query_peer_convert
3212 lines
86 KiB
C
3212 lines
86 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 Thomas Vander Stichele <thomas@apestaart.org>
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*
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* gstutils.c: Utility functions: gtk_get_property stuff, etc.
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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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/**
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* SECTION:gstutils
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* @short_description: Various utility functions
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*
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* When defining own plugins, use the GST_BOILERPLATE ease gobject creation.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "gst_private.h"
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#include "gstghostpad.h"
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#include "gstutils.h"
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#include "gstinfo.h"
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#include "gstparse.h"
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#include "gst-i18n-lib.h"
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/**
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* gst_util_dump_mem:
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* @mem: a pointer to the memory to dump
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* @size: the size of the memory block to dump
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*
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* Dumps the memory block into a hex representation. Useful for debugging.
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*/
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void
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gst_util_dump_mem (const guchar * mem, guint size)
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{
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guint i, j;
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GString *string = g_string_sized_new (50);
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GString *chars = g_string_sized_new (18);
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i = j = 0;
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while (i < size) {
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if (g_ascii_isprint (mem[i]))
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g_string_append_printf (chars, "%c", mem[i]);
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else
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g_string_append_printf (chars, ".");
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g_string_append_printf (string, "%02x ", mem[i]);
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j++;
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i++;
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if (j == 16 || i == size) {
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g_print ("%08x (%p): %-48.48s %-16.16s\n", i - j, mem + i - j,
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string->str, chars->str);
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g_string_set_size (string, 0);
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g_string_set_size (chars, 0);
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j = 0;
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}
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}
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g_string_free (string, TRUE);
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g_string_free (chars, TRUE);
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}
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/**
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* gst_util_set_value_from_string:
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* @value: the value to set
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* @value_str: the string to get the value from
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*
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* Converts the string to the type of the value and
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* sets the value with it.
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*/
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void
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gst_util_set_value_from_string (GValue * value, const gchar * value_str)
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{
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gint sscanf_ret;
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g_return_if_fail (value != NULL);
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g_return_if_fail (value_str != NULL);
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GST_CAT_DEBUG (GST_CAT_PARAMS, "parsing '%s' to type %s", value_str,
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g_type_name (G_VALUE_TYPE (value)));
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switch (G_VALUE_TYPE (value)) {
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case G_TYPE_STRING:
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g_value_set_string (value, g_strdup (value_str));
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break;
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case G_TYPE_ENUM:
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case G_TYPE_INT:{
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gint i;
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sscanf_ret = sscanf (value_str, "%d", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_value_set_int (value, i);
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break;
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}
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case G_TYPE_UINT:{
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guint i;
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sscanf_ret = sscanf (value_str, "%u", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_value_set_uint (value, i);
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break;
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}
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case G_TYPE_LONG:{
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glong i;
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sscanf_ret = sscanf (value_str, "%ld", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_value_set_long (value, i);
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break;
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}
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case G_TYPE_ULONG:{
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gulong i;
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sscanf_ret = sscanf (value_str, "%lu", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_value_set_ulong (value, i);
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break;
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}
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case G_TYPE_BOOLEAN:{
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gboolean i = FALSE;
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if (!g_ascii_strncasecmp ("true", value_str, 4))
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i = TRUE;
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g_value_set_boolean (value, i);
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break;
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}
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case G_TYPE_CHAR:{
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gchar i;
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sscanf_ret = sscanf (value_str, "%c", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_value_set_char (value, i);
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break;
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}
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case G_TYPE_UCHAR:{
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guchar i;
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sscanf_ret = sscanf (value_str, "%c", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_value_set_uchar (value, i);
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break;
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}
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case G_TYPE_FLOAT:{
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gfloat i;
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sscanf_ret = sscanf (value_str, "%f", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_value_set_float (value, i);
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break;
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}
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case G_TYPE_DOUBLE:{
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gfloat i;
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sscanf_ret = sscanf (value_str, "%g", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_value_set_double (value, (gdouble) i);
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break;
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}
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default:
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break;
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}
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}
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/**
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* gst_util_set_object_arg:
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* @object: the object to set the argument of
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* @name: the name of the argument to set
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* @value: the string value to set
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*
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* Convertes the string value to the type of the objects argument and
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* sets the argument with it.
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*/
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void
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gst_util_set_object_arg (GObject * object, const gchar * name,
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const gchar * value)
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{
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gboolean sscanf_ret;
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if (name && value) {
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GParamSpec *paramspec;
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paramspec =
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g_object_class_find_property (G_OBJECT_GET_CLASS (object), name);
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if (!paramspec) {
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return;
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}
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GST_DEBUG ("paramspec->flags is %d, paramspec->value_type is %d",
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paramspec->flags, (gint) paramspec->value_type);
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if (paramspec->flags & G_PARAM_WRITABLE) {
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switch (paramspec->value_type) {
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case G_TYPE_STRING:
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g_object_set (G_OBJECT (object), name, value, NULL);
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break;
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case G_TYPE_ENUM:
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case G_TYPE_INT:{
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gint i;
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sscanf_ret = sscanf (value, "%d", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_object_set (G_OBJECT (object), name, i, NULL);
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break;
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}
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case G_TYPE_UINT:{
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guint i;
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sscanf_ret = sscanf (value, "%u", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_object_set (G_OBJECT (object), name, i, NULL);
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break;
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}
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case G_TYPE_LONG:{
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glong i;
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sscanf_ret = sscanf (value, "%ld", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_object_set (G_OBJECT (object), name, i, NULL);
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break;
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}
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case G_TYPE_ULONG:{
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gulong i;
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sscanf_ret = sscanf (value, "%lu", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_object_set (G_OBJECT (object), name, i, NULL);
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break;
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}
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case G_TYPE_BOOLEAN:{
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gboolean i = FALSE;
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if (!g_ascii_strncasecmp ("true", value, 4))
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i = TRUE;
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g_object_set (G_OBJECT (object), name, i, NULL);
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break;
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}
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case G_TYPE_CHAR:{
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gchar i;
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sscanf_ret = sscanf (value, "%c", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_object_set (G_OBJECT (object), name, i, NULL);
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break;
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}
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case G_TYPE_UCHAR:{
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guchar i;
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sscanf_ret = sscanf (value, "%c", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_object_set (G_OBJECT (object), name, i, NULL);
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break;
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}
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case G_TYPE_FLOAT:{
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gfloat i;
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sscanf_ret = sscanf (value, "%f", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_object_set (G_OBJECT (object), name, i, NULL);
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break;
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}
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case G_TYPE_DOUBLE:{
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gfloat i;
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sscanf_ret = sscanf (value, "%g", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_object_set (G_OBJECT (object), name, (gdouble) i, NULL);
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break;
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}
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default:
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if (G_IS_PARAM_SPEC_ENUM (paramspec)) {
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gint i;
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sscanf_ret = sscanf (value, "%d", &i);
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g_return_if_fail (sscanf_ret == 1);
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g_object_set (G_OBJECT (object), name, i, NULL);
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}
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break;
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}
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}
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}
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}
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/* work around error C2520: conversion from unsigned __int64 to double
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* not implemented, use signed __int64
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*
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* These are implemented as functions because on some platforms a 64bit int to
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* double conversion is not defined/implemented.
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*/
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gdouble
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gst_util_guint64_to_gdouble (guint64 value)
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{
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if (value & G_GINT64_CONSTANT (0x8000000000000000))
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return (gdouble) ((gint64) value) + (gdouble) 18446744073709551616.;
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else
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return (gdouble) ((gint64) value);
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}
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guint64
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gst_util_gdouble_to_guint64 (gdouble value)
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{
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if (value < (gdouble) 9223372036854775808.) /* 1 << 63 */
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return ((guint64) ((gint64) value));
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value -= (gdouble) 18446744073709551616.;
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return ((guint64) ((gint64) value));
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}
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/* convenience struct for getting high and low uint32 parts of
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* a guint64 */
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typedef union
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{
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guint64 ll;
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struct
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{
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#if G_BYTE_ORDER == G_BIG_ENDIAN
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guint32 high, low;
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#else
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guint32 low, high;
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#endif
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} l;
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} GstUInt64;
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/* based on Hacker's Delight p152 */
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static guint64
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gst_util_div128_64 (GstUInt64 c1, GstUInt64 c0, guint64 denom)
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{
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GstUInt64 q1, q0, rhat;
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GstUInt64 v, cmp1, cmp2;
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guint s;
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v.ll = denom;
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/* count number of leading zeroes, we know they must be in the high
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* part of denom since denom > G_MAXUINT32. */
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s = v.l.high | (v.l.high >> 1);
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s |= (s >> 2);
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s |= (s >> 4);
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s |= (s >> 8);
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s = ~(s | (s >> 16));
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s = s - ((s >> 1) & 0x55555555);
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s = (s & 0x33333333) + ((s >> 2) & 0x33333333);
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s = (s + (s >> 4)) & 0x0f0f0f0f;
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s += (s >> 8);
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s = (s + (s >> 16)) & 0x3f;
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if (s > 0) {
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/* normalize divisor and dividend */
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v.ll <<= s;
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c1.ll = (c1.ll << s) | (c0.l.high >> (32 - s));
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c0.ll <<= s;
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}
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q1.ll = c1.ll / v.l.high;
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rhat.ll = c1.ll - q1.ll * v.l.high;
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cmp1.l.high = rhat.l.low;
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cmp1.l.low = c0.l.high;
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cmp2.ll = q1.ll * v.l.low;
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while (q1.l.high || cmp2.ll > cmp1.ll) {
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q1.ll--;
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rhat.ll += v.l.high;
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if (rhat.l.high)
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break;
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cmp1.l.high = rhat.l.low;
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cmp2.ll -= v.l.low;
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}
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c1.l.high = c1.l.low;
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c1.l.low = c0.l.high;
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c1.ll -= q1.ll * v.ll;
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q0.ll = c1.ll / v.l.high;
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rhat.ll = c1.ll - q0.ll * v.l.high;
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cmp1.l.high = rhat.l.low;
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cmp1.l.low = c0.l.low;
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cmp2.ll = q0.ll * v.l.low;
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while (q0.l.high || cmp2.ll > cmp1.ll) {
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q0.ll--;
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rhat.ll += v.l.high;
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if (rhat.l.high)
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break;
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cmp1.l.high = rhat.l.low;
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cmp2.ll -= v.l.low;
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}
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q0.l.high += q1.l.low;
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return q0.ll;
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}
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static guint64
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gst_util_uint64_scale_int64 (guint64 val, guint64 num, guint64 denom)
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{
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GstUInt64 a0, a1, b0, b1, c0, ct, c1, result;
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GstUInt64 v, n;
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/* prepare input */
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v.ll = val;
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n.ll = num;
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/* do 128 bits multiply
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* nh nl
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* * vh vl
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* ----------
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* a0 = vl * nl
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* a1 = vl * nh
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* b0 = vh * nl
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* b1 = + vh * nh
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* -------------------
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* c1,c0
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*/
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a0.ll = (guint64) v.l.low * n.l.low;
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a1.ll = (guint64) v.l.low * n.l.high;
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b0.ll = (guint64) v.l.high * n.l.low;
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b1.ll = (guint64) v.l.high * n.l.high;
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|
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/* and sum together with carry into 128 bits c1, c0 */
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c0.l.low = a0.l.low;
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ct.ll = (guint64) a0.l.high + a1.l.low + b0.l.low;
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c0.l.high = ct.l.low;
|
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c1.ll = (guint64) a1.l.high + b0.l.high + ct.l.high + b1.ll;
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|
|
/* if high bits bigger than denom, we overflow */
|
|
if (c1.ll >= denom)
|
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goto overflow;
|
|
|
|
/* shortcut for division by 1, c1.ll should be 0 because of the
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* overflow check above. */
|
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if (denom == 1)
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return c0.ll;
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|
|
/* and 128/64 bits division, result fits 64 bits */
|
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if (denom <= G_MAXUINT32) {
|
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guint32 den = (guint32) denom;
|
|
|
|
/* easy case, (c1,c0)128/(den)32 division */
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c1.l.high %= den;
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c1.l.high = c1.ll % den;
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c1.l.low = c0.l.high;
|
|
c0.l.high = c1.ll % den;
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result.l.high = c1.ll / den;
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result.l.low = c0.ll / den;
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} else {
|
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result.ll = gst_util_div128_64 (c1, c0, denom);
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}
|
|
return result.ll;
|
|
|
|
overflow:
|
|
{
|
|
return G_MAXUINT64;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_util_uint64_scale:
|
|
* @val: the number to scale
|
|
* @num: the numerator of the scale ratio
|
|
* @denom: the denominator of the scale ratio
|
|
*
|
|
* Scale @val by @num / @denom, trying to avoid overflows.
|
|
*
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|
* This function can potentially be very slow if denom > G_MAXUINT32.
|
|
*
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|
* Returns: @val * @num / @denom, trying to avoid overflows.
|
|
*/
|
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guint64
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|
gst_util_uint64_scale (guint64 val, guint64 num, guint64 denom)
|
|
{
|
|
g_return_val_if_fail (denom != 0, G_MAXUINT64);
|
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|
|
if (num == 0)
|
|
return 0;
|
|
|
|
if (num == 1 && denom == 1)
|
|
return val;
|
|
|
|
/* if the denom is high, we need to do a 64 muldiv */
|
|
if (denom > G_MAXINT32)
|
|
goto do_int64;
|
|
|
|
/* if num and denom are low we can do a 32 bit muldiv */
|
|
if (num <= G_MAXINT32)
|
|
goto do_int32;
|
|
|
|
/* val and num are high, we need 64 muldiv */
|
|
if (val > G_MAXINT32)
|
|
goto do_int64;
|
|
|
|
/* val is low and num is high, we can swap them and do 32 muldiv */
|
|
return gst_util_uint64_scale_int (num, (gint) val, (gint) denom);
|
|
|
|
do_int32:
|
|
return gst_util_uint64_scale_int (val, (gint) num, (gint) denom);
|
|
|
|
do_int64:
|
|
/* to the more heavy implementations... */
|
|
return gst_util_uint64_scale_int64 (val, num, denom);
|
|
}
|
|
|
|
/**
|
|
* gst_util_uint64_scale_int:
|
|
* @val: guint64 (such as a #GstClockTime) to scale.
|
|
* @num: numerator of the scale factor.
|
|
* @denom: denominator of the scale factor.
|
|
*
|
|
* Scale a guint64 by a factor expressed as a fraction (num/denom), avoiding
|
|
* overflows and loss of precision.
|
|
*
|
|
* @num and @denom must be positive integers. @denom cannot be 0.
|
|
*
|
|
* Returns: @val * @num / @denom, avoiding overflow and loss of precision
|
|
*/
|
|
guint64
|
|
gst_util_uint64_scale_int (guint64 val, gint num, gint denom)
|
|
{
|
|
GstUInt64 result;
|
|
GstUInt64 low, high;
|
|
|
|
g_return_val_if_fail (denom > 0, G_MAXUINT64);
|
|
g_return_val_if_fail (num >= 0, G_MAXUINT64);
|
|
|
|
if (num == 0)
|
|
return 0;
|
|
|
|
if (num == 1 && denom == 1)
|
|
return val;
|
|
|
|
if (val <= G_MAXUINT32)
|
|
/* simple case */
|
|
return val * num / denom;
|
|
|
|
/* do 96 bits mult/div */
|
|
low.ll = val;
|
|
result.ll = ((guint64) low.l.low) * num;
|
|
high.ll = ((guint64) low.l.high) * num + (result.l.high);
|
|
|
|
low.ll = high.ll / denom;
|
|
result.l.high = high.ll % denom;
|
|
result.ll /= denom;
|
|
|
|
/* avoid overflow */
|
|
if (low.ll + result.l.high > G_MAXUINT32)
|
|
goto overflow;
|
|
|
|
result.l.high += low.l.low;
|
|
|
|
return result.ll;
|
|
|
|
overflow:
|
|
{
|
|
return G_MAXUINT64;
|
|
}
|
|
}
|
|
|
|
/* -----------------------------------------------------
|
|
*
|
|
* The following code will be moved out of the main
|
|
* gstreamer library someday.
|
|
*/
|
|
|
|
#include "gstpad.h"
|
|
|
|
static void
|
|
string_append_indent (GString * str, gint count)
|
|
{
|
|
gint xx;
|
|
|
|
for (xx = 0; xx < count; xx++)
|
|
g_string_append_c (str, ' ');
|
|
}
|
|
|
|
/**
|
|
* gst_print_pad_caps:
|
|
* @buf: the buffer to print the caps in
|
|
* @indent: initial indentation
|
|
* @pad: the pad to print the caps from
|
|
*
|
|
* Write the pad capabilities in a human readable format into
|
|
* the given GString.
|
|
*/
|
|
void
|
|
gst_print_pad_caps (GString * buf, gint indent, GstPad * pad)
|
|
{
|
|
GstCaps *caps;
|
|
|
|
caps = pad->caps;
|
|
|
|
if (!caps) {
|
|
string_append_indent (buf, indent);
|
|
g_string_printf (buf, "%s:%s has no capabilities",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
} else {
|
|
char *s;
|
|
|
|
s = gst_caps_to_string (caps);
|
|
g_string_append (buf, s);
|
|
g_free (s);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_print_element_args:
|
|
* @buf: the buffer to print the args in
|
|
* @indent: initial indentation
|
|
* @element: the element to print the args of
|
|
*
|
|
* Print the element argument in a human readable format in the given
|
|
* GString.
|
|
*/
|
|
void
|
|
gst_print_element_args (GString * buf, gint indent, GstElement * element)
|
|
{
|
|
guint width;
|
|
GValue value = { 0, }; /* the important thing is that value.type = 0 */
|
|
gchar *str = NULL;
|
|
GParamSpec *spec, **specs, **walk;
|
|
|
|
specs = g_object_class_list_properties (G_OBJECT_GET_CLASS (element), NULL);
|
|
|
|
width = 0;
|
|
for (walk = specs; *walk; walk++) {
|
|
spec = *walk;
|
|
if (width < strlen (spec->name))
|
|
width = strlen (spec->name);
|
|
}
|
|
|
|
for (walk = specs; *walk; walk++) {
|
|
spec = *walk;
|
|
|
|
if (spec->flags & G_PARAM_READABLE) {
|
|
g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (spec));
|
|
g_object_get_property (G_OBJECT (element), spec->name, &value);
|
|
str = g_strdup_value_contents (&value);
|
|
g_value_unset (&value);
|
|
} else {
|
|
str = g_strdup ("Parameter not readable.");
|
|
}
|
|
|
|
string_append_indent (buf, indent);
|
|
g_string_append (buf, spec->name);
|
|
string_append_indent (buf, 2 + width - strlen (spec->name));
|
|
g_string_append (buf, str);
|
|
g_string_append_c (buf, '\n');
|
|
|
|
g_free (str);
|
|
}
|
|
|
|
g_free (specs);
|
|
}
|
|
|
|
/**
|
|
* gst_element_create_all_pads:
|
|
* @element: a #GstElement to create pads for
|
|
*
|
|
* Creates a pad for each pad template that is always available.
|
|
* This function is only useful during object intialization of
|
|
* subclasses of #GstElement.
|
|
*/
|
|
void
|
|
gst_element_create_all_pads (GstElement * element)
|
|
{
|
|
GList *padlist;
|
|
|
|
/* FIXME: lock element */
|
|
|
|
padlist =
|
|
gst_element_class_get_pad_template_list (GST_ELEMENT_CLASS
|
|
(G_OBJECT_GET_CLASS (element)));
|
|
|
|
while (padlist) {
|
|
GstPadTemplate *padtempl = (GstPadTemplate *) padlist->data;
|
|
|
|
if (padtempl->presence == GST_PAD_ALWAYS) {
|
|
GstPad *pad;
|
|
|
|
pad = gst_pad_new_from_template (padtempl, padtempl->name_template);
|
|
|
|
gst_element_add_pad (element, pad);
|
|
}
|
|
padlist = padlist->next;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_compatible_pad_template:
|
|
* @element: a #GstElement to get a compatible pad template for.
|
|
* @compattempl: the #GstPadTemplate to find a compatible template for.
|
|
*
|
|
* Retrieves a pad template from @element that is compatible with @compattempl.
|
|
* Pads from compatible templates can be linked together.
|
|
*
|
|
* Returns: a compatible #GstPadTemplate, or NULL if none was found. No
|
|
* unreferencing is necessary.
|
|
*/
|
|
GstPadTemplate *
|
|
gst_element_get_compatible_pad_template (GstElement * element,
|
|
GstPadTemplate * compattempl)
|
|
{
|
|
GstPadTemplate *newtempl = NULL;
|
|
GList *padlist;
|
|
GstElementClass *class;
|
|
|
|
g_return_val_if_fail (element != NULL, NULL);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (compattempl != NULL, NULL);
|
|
|
|
class = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
padlist = gst_element_class_get_pad_template_list (class);
|
|
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
|
|
"Looking for a suitable pad template in %s out of %d templates...",
|
|
GST_ELEMENT_NAME (element), g_list_length (padlist));
|
|
|
|
while (padlist) {
|
|
GstPadTemplate *padtempl = (GstPadTemplate *) padlist->data;
|
|
GstCaps *intersection;
|
|
|
|
/* Ignore name
|
|
* Ignore presence
|
|
* Check direction (must be opposite)
|
|
* Check caps
|
|
*/
|
|
GST_CAT_LOG (GST_CAT_CAPS,
|
|
"checking pad template %s", padtempl->name_template);
|
|
if (padtempl->direction != compattempl->direction) {
|
|
GST_CAT_DEBUG (GST_CAT_CAPS,
|
|
"compatible direction: found %s pad template \"%s\"",
|
|
padtempl->direction == GST_PAD_SRC ? "src" : "sink",
|
|
padtempl->name_template);
|
|
|
|
GST_CAT_DEBUG (GST_CAT_CAPS,
|
|
"intersecting %" GST_PTR_FORMAT, GST_PAD_TEMPLATE_CAPS (compattempl));
|
|
GST_CAT_DEBUG (GST_CAT_CAPS,
|
|
"..and %" GST_PTR_FORMAT, GST_PAD_TEMPLATE_CAPS (padtempl));
|
|
|
|
intersection = gst_caps_intersect (GST_PAD_TEMPLATE_CAPS (compattempl),
|
|
GST_PAD_TEMPLATE_CAPS (padtempl));
|
|
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "caps are %scompatible %" GST_PTR_FORMAT,
|
|
(intersection ? "" : "not "), intersection);
|
|
|
|
if (!gst_caps_is_empty (intersection))
|
|
newtempl = padtempl;
|
|
gst_caps_unref (intersection);
|
|
if (newtempl)
|
|
break;
|
|
}
|
|
|
|
padlist = g_list_next (padlist);
|
|
}
|
|
if (newtempl)
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
|
|
"Returning new pad template %p", newtempl);
|
|
else
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "No compatible pad template found");
|
|
|
|
return newtempl;
|
|
}
|
|
|
|
static GstPad *
|
|
gst_element_request_pad (GstElement * element, GstPadTemplate * templ,
|
|
const gchar * name)
|
|
{
|
|
GstPad *newpad = NULL;
|
|
GstElementClass *oclass;
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->request_new_pad)
|
|
newpad = (oclass->request_new_pad) (element, templ, name);
|
|
|
|
if (newpad)
|
|
gst_object_ref (newpad);
|
|
|
|
return newpad;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* gst_element_get_pad_from_template:
|
|
* @element: a #GstElement.
|
|
* @templ: a #GstPadTemplate belonging to @element.
|
|
*
|
|
* Gets a pad from @element described by @templ. If the presence of @templ is
|
|
* #GST_PAD_REQUEST, requests a new pad. Can return %NULL for #GST_PAD_SOMETIMES
|
|
* templates.
|
|
*
|
|
* Returns: the #GstPad, or NULL if one could not be found or created.
|
|
*/
|
|
static GstPad *
|
|
gst_element_get_pad_from_template (GstElement * element, GstPadTemplate * templ)
|
|
{
|
|
GstPad *ret = NULL;
|
|
GstPadPresence presence;
|
|
|
|
/* If this function is ever exported, we need check the validity of `element'
|
|
* and `templ', and to make sure the template actually belongs to the
|
|
* element. */
|
|
|
|
presence = GST_PAD_TEMPLATE_PRESENCE (templ);
|
|
|
|
switch (presence) {
|
|
case GST_PAD_ALWAYS:
|
|
case GST_PAD_SOMETIMES:
|
|
ret = gst_element_get_static_pad (element, templ->name_template);
|
|
if (!ret && presence == GST_PAD_ALWAYS)
|
|
g_warning
|
|
("Element %s has an ALWAYS template %s, but no pad of the same name",
|
|
GST_OBJECT_NAME (element), templ->name_template);
|
|
break;
|
|
|
|
case GST_PAD_REQUEST:
|
|
ret = gst_element_request_pad (element, templ, NULL);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_element_request_compatible_pad:
|
|
* @element: a #GstElement.
|
|
* @templ: the #GstPadTemplate to which the new pad should be able to link.
|
|
*
|
|
* Requests a pad from @element. The returned pad should be unlinked and
|
|
* compatible with @templ. Might return an existing pad, or request a new one.
|
|
*
|
|
* Returns: a #GstPad, or %NULL if one could not be found or created.
|
|
*/
|
|
GstPad *
|
|
gst_element_request_compatible_pad (GstElement * element,
|
|
GstPadTemplate * templ)
|
|
{
|
|
GstPadTemplate *templ_new;
|
|
GstPad *pad = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL);
|
|
|
|
/* FIXME: should really loop through the templates, testing each for
|
|
* compatibility and pad availability. */
|
|
templ_new = gst_element_get_compatible_pad_template (element, templ);
|
|
if (templ_new)
|
|
pad = gst_element_get_pad_from_template (element, templ_new);
|
|
|
|
/* This can happen for non-request pads. No need to unref. */
|
|
if (pad && GST_PAD_PEER (pad))
|
|
pad = NULL;
|
|
|
|
return pad;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_compatible_pad:
|
|
* @element: a #GstElement in which the pad should be found.
|
|
* @pad: the #GstPad to find a compatible one for.
|
|
* @caps: the #GstCaps to use as a filter.
|
|
*
|
|
* Looks for an unlinked pad to which the given pad can link. It is not
|
|
* guaranteed that linking the pads will work, though it should work in most
|
|
* cases.
|
|
*
|
|
* Returns: the #GstPad to which a link can be made, or %NULL if one cannot be
|
|
* found.
|
|
*/
|
|
GstPad *
|
|
gst_element_get_compatible_pad (GstElement * element, GstPad * pad,
|
|
const GstCaps * caps)
|
|
{
|
|
GstIterator *pads;
|
|
GstPadTemplate *templ;
|
|
GstCaps *templcaps;
|
|
GstPad *foundpad = NULL;
|
|
gboolean done;
|
|
|
|
/* FIXME check for caps compatibility */
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
|
|
"finding pad in %s compatible with %s:%s",
|
|
GST_ELEMENT_NAME (element), GST_DEBUG_PAD_NAME (pad));
|
|
|
|
g_return_val_if_fail (GST_PAD_PEER (pad) == NULL, NULL);
|
|
|
|
done = FALSE;
|
|
/* try to get an existing unlinked pad */
|
|
pads = gst_element_iterate_pads (element);
|
|
while (!done) {
|
|
gpointer padptr;
|
|
|
|
switch (gst_iterator_next (pads, &padptr)) {
|
|
case GST_ITERATOR_OK:
|
|
{
|
|
GstPad *peer;
|
|
GstPad *current;
|
|
|
|
current = GST_PAD (padptr);
|
|
|
|
GST_CAT_LOG (GST_CAT_ELEMENT_PADS, "examining pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (current));
|
|
|
|
peer = gst_pad_get_peer (current);
|
|
|
|
if (peer == NULL && gst_pad_can_link (pad, current)) {
|
|
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
|
|
"found existing unlinked pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (current));
|
|
|
|
gst_iterator_free (pads);
|
|
|
|
return current;
|
|
} else {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "unreffing pads");
|
|
|
|
gst_object_unref (current);
|
|
if (peer)
|
|
gst_object_unref (peer);
|
|
}
|
|
break;
|
|
}
|
|
case GST_ITERATOR_DONE:
|
|
done = TRUE;
|
|
break;
|
|
case GST_ITERATOR_RESYNC:
|
|
gst_iterator_resync (pads);
|
|
break;
|
|
case GST_ITERATOR_ERROR:
|
|
g_assert_not_reached ();
|
|
break;
|
|
}
|
|
}
|
|
gst_iterator_free (pads);
|
|
|
|
/* try to create a new one */
|
|
/* requesting is a little crazy, we need a template. Let's create one */
|
|
templcaps = gst_pad_get_caps (pad);
|
|
|
|
templ = gst_pad_template_new ((gchar *) GST_PAD_NAME (pad),
|
|
GST_PAD_DIRECTION (pad), GST_PAD_ALWAYS, templcaps);
|
|
foundpad = gst_element_request_compatible_pad (element, templ);
|
|
gst_object_unref (templ);
|
|
|
|
if (foundpad) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
|
|
"found existing request pad %s:%s", GST_DEBUG_PAD_NAME (foundpad));
|
|
return foundpad;
|
|
}
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_ELEMENT_PADS, element,
|
|
"Could not find a compatible pad to link to %s:%s",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_element_state_get_name:
|
|
* @state: a #GstState to get the name of.
|
|
*
|
|
* Gets a string representing the given state.
|
|
*
|
|
* Returns: a string with the name of the state.
|
|
*/
|
|
const gchar *
|
|
gst_element_state_get_name (GstState state)
|
|
{
|
|
switch (state) {
|
|
#ifdef GST_DEBUG_COLOR
|
|
case GST_STATE_VOID_PENDING:
|
|
return "VOID_PENDING";
|
|
break;
|
|
case GST_STATE_NULL:
|
|
return "\033[01;34mNULL\033[00m";
|
|
break;
|
|
case GST_STATE_READY:
|
|
return "\033[01;31mREADY\033[00m";
|
|
break;
|
|
case GST_STATE_PLAYING:
|
|
return "\033[01;32mPLAYING\033[00m";
|
|
break;
|
|
case GST_STATE_PAUSED:
|
|
return "\033[01;33mPAUSED\033[00m";
|
|
break;
|
|
default:
|
|
/* This is a memory leak */
|
|
return g_strdup_printf ("\033[01;35;41mUNKNOWN!\033[00m(%d)", state);
|
|
#else
|
|
case GST_STATE_VOID_PENDING:
|
|
return "VOID_PENDING";
|
|
break;
|
|
case GST_STATE_NULL:
|
|
return "NULL";
|
|
break;
|
|
case GST_STATE_READY:
|
|
return "READY";
|
|
break;
|
|
case GST_STATE_PLAYING:
|
|
return "PLAYING";
|
|
break;
|
|
case GST_STATE_PAUSED:
|
|
return "PAUSED";
|
|
break;
|
|
default:
|
|
/* This is a memory leak */
|
|
return g_strdup_printf ("UNKNOWN!(%d)", state);
|
|
#endif
|
|
}
|
|
return "";
|
|
}
|
|
|
|
/**
|
|
* gst_element_factory_can_src_caps :
|
|
* @factory: factory to query
|
|
* @caps: the caps to check
|
|
*
|
|
* Checks if the factory can source the given capability.
|
|
*
|
|
* Returns: true if it can src the capabilities
|
|
*/
|
|
gboolean
|
|
gst_element_factory_can_src_caps (GstElementFactory * factory,
|
|
const GstCaps * caps)
|
|
{
|
|
GList *templates;
|
|
|
|
g_return_val_if_fail (factory != NULL, FALSE);
|
|
g_return_val_if_fail (caps != NULL, FALSE);
|
|
|
|
templates = factory->staticpadtemplates;
|
|
|
|
while (templates) {
|
|
GstStaticPadTemplate *template = (GstStaticPadTemplate *) templates->data;
|
|
|
|
if (template->direction == GST_PAD_SRC) {
|
|
if (gst_caps_is_always_compatible (gst_static_caps_get (&template->
|
|
static_caps), caps))
|
|
return TRUE;
|
|
}
|
|
templates = g_list_next (templates);
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* gst_element_factory_can_sink_caps :
|
|
* @factory: factory to query
|
|
* @caps: the caps to check
|
|
*
|
|
* Checks if the factory can sink the given capability.
|
|
*
|
|
* Returns: true if it can sink the capabilities
|
|
*/
|
|
gboolean
|
|
gst_element_factory_can_sink_caps (GstElementFactory * factory,
|
|
const GstCaps * caps)
|
|
{
|
|
GList *templates;
|
|
|
|
g_return_val_if_fail (factory != NULL, FALSE);
|
|
g_return_val_if_fail (caps != NULL, FALSE);
|
|
|
|
templates = factory->staticpadtemplates;
|
|
|
|
while (templates) {
|
|
GstStaticPadTemplate *template = (GstStaticPadTemplate *) templates->data;
|
|
|
|
if (template->direction == GST_PAD_SINK) {
|
|
if (gst_caps_is_always_compatible (caps,
|
|
gst_static_caps_get (&template->static_caps)))
|
|
return TRUE;
|
|
}
|
|
templates = g_list_next (templates);
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
/* if return val is true, *direct_child is a caller-owned ref on the direct
|
|
* child of ancestor that is part of object's ancestry */
|
|
static gboolean
|
|
object_has_ancestor (GstObject * object, GstObject * ancestor,
|
|
GstObject ** direct_child)
|
|
{
|
|
GstObject *child, *parent;
|
|
|
|
if (direct_child)
|
|
*direct_child = NULL;
|
|
|
|
child = gst_object_ref (object);
|
|
parent = gst_object_get_parent (object);
|
|
|
|
while (parent) {
|
|
if (ancestor == parent) {
|
|
if (direct_child)
|
|
*direct_child = child;
|
|
else
|
|
gst_object_unref (child);
|
|
gst_object_unref (parent);
|
|
return TRUE;
|
|
}
|
|
|
|
gst_object_unref (child);
|
|
child = parent;
|
|
parent = gst_object_get_parent (parent);
|
|
}
|
|
|
|
gst_object_unref (child);
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/* caller owns return */
|
|
static GstObject *
|
|
find_common_root (GstObject * o1, GstObject * o2)
|
|
{
|
|
GstObject *top = o1;
|
|
GstObject *kid1, *kid2;
|
|
GstObject *root = NULL;
|
|
|
|
while (GST_OBJECT_PARENT (top))
|
|
top = GST_OBJECT_PARENT (top);
|
|
|
|
/* the itsy-bitsy spider... */
|
|
|
|
if (!object_has_ancestor (o2, top, &kid2))
|
|
return NULL;
|
|
|
|
root = gst_object_ref (top);
|
|
while (TRUE) {
|
|
if (!object_has_ancestor (o1, kid2, &kid1)) {
|
|
gst_object_unref (kid2);
|
|
return root;
|
|
}
|
|
root = kid2;
|
|
if (!object_has_ancestor (o2, kid1, &kid2)) {
|
|
gst_object_unref (kid1);
|
|
return root;
|
|
}
|
|
root = kid1;
|
|
}
|
|
}
|
|
|
|
/* caller does not own return */
|
|
static GstPad *
|
|
ghost_up (GstElement * e, GstPad * pad)
|
|
{
|
|
static gint ghost_pad_index = 0;
|
|
GstPad *gpad;
|
|
gchar *name;
|
|
GstObject *parent = GST_OBJECT_PARENT (e);
|
|
|
|
name = g_strdup_printf ("ghost%d", ghost_pad_index++);
|
|
gpad = gst_ghost_pad_new (name, pad);
|
|
g_free (name);
|
|
|
|
if (!gst_element_add_pad ((GstElement *) parent, gpad)) {
|
|
g_warning ("Pad named %s already exists in element %s\n",
|
|
GST_OBJECT_NAME (gpad), GST_OBJECT_NAME (parent));
|
|
gst_object_unref ((GstObject *) gpad);
|
|
return NULL;
|
|
}
|
|
|
|
return gpad;
|
|
}
|
|
|
|
static void
|
|
remove_pad (gpointer ppad, gpointer unused)
|
|
{
|
|
GstPad *pad = ppad;
|
|
|
|
if (!gst_element_remove_pad ((GstElement *) GST_OBJECT_PARENT (pad), pad))
|
|
g_warning ("Couldn't remove pad %s from element %s",
|
|
GST_OBJECT_NAME (pad), GST_OBJECT_NAME (GST_OBJECT_PARENT (pad)));
|
|
}
|
|
|
|
static gboolean
|
|
prepare_link_maybe_ghosting (GstPad ** src, GstPad ** sink,
|
|
GSList ** pads_created)
|
|
{
|
|
GstObject *root;
|
|
GstObject *e1, *e2;
|
|
GSList *pads_created_local = NULL;
|
|
|
|
g_assert (pads_created);
|
|
|
|
e1 = GST_OBJECT_PARENT (*src);
|
|
e2 = GST_OBJECT_PARENT (*sink);
|
|
|
|
if (GST_OBJECT_PARENT (e1) == GST_OBJECT_PARENT (e2)) {
|
|
GST_CAT_INFO (GST_CAT_PADS, "%s and %s in same bin, no need for ghost pads",
|
|
GST_OBJECT_NAME (e1), GST_OBJECT_NAME (e2));
|
|
return TRUE;
|
|
}
|
|
|
|
GST_CAT_INFO (GST_CAT_PADS, "%s and %s not in same bin, making ghost pads",
|
|
GST_OBJECT_NAME (e1), GST_OBJECT_NAME (e2));
|
|
|
|
/* we need to setup some ghost pads */
|
|
root = find_common_root (e1, e2);
|
|
if (!root) {
|
|
g_warning
|
|
("Trying to connect elements that don't share a common ancestor: %s and %s\n",
|
|
GST_ELEMENT_NAME (e1), GST_ELEMENT_NAME (e2));
|
|
return FALSE;
|
|
}
|
|
|
|
while (GST_OBJECT_PARENT (e1) != root) {
|
|
*src = ghost_up ((GstElement *) e1, *src);
|
|
if (!*src)
|
|
goto cleanup_fail;
|
|
e1 = GST_OBJECT_PARENT (*src);
|
|
pads_created_local = g_slist_prepend (pads_created_local, *src);
|
|
}
|
|
while (GST_OBJECT_PARENT (e2) != root) {
|
|
*sink = ghost_up ((GstElement *) e2, *sink);
|
|
if (!*sink)
|
|
goto cleanup_fail;
|
|
e2 = GST_OBJECT_PARENT (*sink);
|
|
pads_created_local = g_slist_prepend (pads_created_local, *sink);
|
|
}
|
|
|
|
gst_object_unref (root);
|
|
*pads_created = g_slist_concat (*pads_created, pads_created_local);
|
|
return TRUE;
|
|
|
|
cleanup_fail:
|
|
gst_object_unref (root);
|
|
g_slist_foreach (pads_created_local, remove_pad, NULL);
|
|
g_slist_free (pads_created_local);
|
|
return FALSE;
|
|
}
|
|
|
|
static gboolean
|
|
pad_link_maybe_ghosting (GstPad * src, GstPad * sink)
|
|
{
|
|
GSList *pads_created = NULL;
|
|
gboolean ret;
|
|
|
|
if (!prepare_link_maybe_ghosting (&src, &sink, &pads_created)) {
|
|
ret = FALSE;
|
|
} else {
|
|
ret = (gst_pad_link (src, sink) == GST_PAD_LINK_OK);
|
|
}
|
|
|
|
if (!ret) {
|
|
g_slist_foreach (pads_created, remove_pad, NULL);
|
|
}
|
|
g_slist_free (pads_created);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_element_link_pads:
|
|
* @src: a #GstElement containing the source pad.
|
|
* @srcpadname: the name of the #GstPad in source element or NULL for any pad.
|
|
* @dest: the #GstElement containing the destination pad.
|
|
* @destpadname: the name of the #GstPad in destination element,
|
|
* or NULL for any pad.
|
|
*
|
|
* Links the two named pads of the source and destination elements.
|
|
* Side effect is that if one of the pads has no parent, it becomes a
|
|
* child of the parent of the other element. If they have different
|
|
* parents, the link fails.
|
|
*
|
|
* Returns: TRUE if the pads could be linked, FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_element_link_pads (GstElement * src, const gchar * srcpadname,
|
|
GstElement * dest, const gchar * destpadname)
|
|
{
|
|
const GList *srcpads, *destpads, *srctempls, *desttempls, *l;
|
|
GstPad *srcpad, *destpad;
|
|
GstPadTemplate *srctempl, *desttempl;
|
|
GstElementClass *srcclass, *destclass;
|
|
|
|
/* checks */
|
|
g_return_val_if_fail (GST_IS_ELEMENT (src), FALSE);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (dest), FALSE);
|
|
|
|
srcclass = GST_ELEMENT_GET_CLASS (src);
|
|
destclass = GST_ELEMENT_GET_CLASS (dest);
|
|
|
|
GST_CAT_INFO (GST_CAT_ELEMENT_PADS,
|
|
"trying to link element %s:%s to element %s:%s", GST_ELEMENT_NAME (src),
|
|
srcpadname ? srcpadname : "(any)", GST_ELEMENT_NAME (dest),
|
|
destpadname ? destpadname : "(any)");
|
|
|
|
/* get a src pad */
|
|
if (srcpadname) {
|
|
/* name specified, look it up */
|
|
srcpad = gst_element_get_pad (src, srcpadname);
|
|
if (!srcpad) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "no pad %s:%s",
|
|
GST_ELEMENT_NAME (src), srcpadname);
|
|
return FALSE;
|
|
} else {
|
|
if (!(GST_PAD_DIRECTION (srcpad) == GST_PAD_SRC)) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is no src pad",
|
|
GST_DEBUG_PAD_NAME (srcpad));
|
|
gst_object_unref (srcpad);
|
|
return FALSE;
|
|
}
|
|
if (GST_PAD_PEER (srcpad) != NULL) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is already linked",
|
|
GST_DEBUG_PAD_NAME (srcpad));
|
|
gst_object_unref (srcpad);
|
|
return FALSE;
|
|
}
|
|
}
|
|
srcpads = NULL;
|
|
} else {
|
|
/* no name given, get the first available pad */
|
|
GST_OBJECT_LOCK (src);
|
|
srcpads = GST_ELEMENT_PADS (src);
|
|
srcpad = srcpads ? GST_PAD_CAST (srcpads->data) : NULL;
|
|
if (srcpad)
|
|
gst_object_ref (srcpad);
|
|
GST_OBJECT_UNLOCK (src);
|
|
}
|
|
|
|
/* get a destination pad */
|
|
if (destpadname) {
|
|
/* name specified, look it up */
|
|
destpad = gst_element_get_pad (dest, destpadname);
|
|
if (!destpad) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "no pad %s:%s",
|
|
GST_ELEMENT_NAME (dest), destpadname);
|
|
return FALSE;
|
|
} else {
|
|
if (!(GST_PAD_DIRECTION (destpad) == GST_PAD_SINK)) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is no sink pad",
|
|
GST_DEBUG_PAD_NAME (destpad));
|
|
gst_object_unref (destpad);
|
|
return FALSE;
|
|
}
|
|
if (GST_PAD_PEER (destpad) != NULL) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is already linked",
|
|
GST_DEBUG_PAD_NAME (destpad));
|
|
gst_object_unref (destpad);
|
|
return FALSE;
|
|
}
|
|
}
|
|
destpads = NULL;
|
|
} else {
|
|
/* no name given, get the first available pad */
|
|
GST_OBJECT_LOCK (dest);
|
|
destpads = GST_ELEMENT_PADS (dest);
|
|
destpad = destpads ? GST_PAD_CAST (destpads->data) : NULL;
|
|
if (destpad)
|
|
gst_object_ref (destpad);
|
|
GST_OBJECT_UNLOCK (dest);
|
|
}
|
|
|
|
if (srcpadname && destpadname) {
|
|
gboolean result;
|
|
|
|
/* two explicitly specified pads */
|
|
result = pad_link_maybe_ghosting (srcpad, destpad);
|
|
|
|
gst_object_unref (srcpad);
|
|
gst_object_unref (destpad);
|
|
|
|
return result;
|
|
}
|
|
|
|
if (srcpad) {
|
|
/* loop through the allowed pads in the source, trying to find a
|
|
* compatible destination pad */
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
|
|
"looping through allowed src and dest pads");
|
|
do {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "trying src pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (srcpad));
|
|
if ((GST_PAD_DIRECTION (srcpad) == GST_PAD_SRC) &&
|
|
(GST_PAD_PEER (srcpad) == NULL)) {
|
|
GstPad *temp;
|
|
|
|
if (destpadname) {
|
|
temp = destpad;
|
|
gst_object_ref (temp);
|
|
} else {
|
|
temp = gst_element_get_compatible_pad (dest, srcpad, NULL);
|
|
}
|
|
|
|
if (temp && pad_link_maybe_ghosting (srcpad, temp)) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "linked pad %s:%s to pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (temp));
|
|
if (destpad)
|
|
gst_object_unref (destpad);
|
|
gst_object_unref (srcpad);
|
|
gst_object_unref (temp);
|
|
return TRUE;
|
|
}
|
|
|
|
if (temp) {
|
|
gst_object_unref (temp);
|
|
}
|
|
}
|
|
/* find a better way for this mess */
|
|
if (srcpads) {
|
|
srcpads = g_list_next (srcpads);
|
|
if (srcpads) {
|
|
gst_object_unref (srcpad);
|
|
srcpad = GST_PAD_CAST (srcpads->data);
|
|
gst_object_ref (srcpad);
|
|
}
|
|
}
|
|
} while (srcpads);
|
|
}
|
|
if (srcpadname) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "no link possible from %s:%s to %s",
|
|
GST_DEBUG_PAD_NAME (srcpad), GST_ELEMENT_NAME (dest));
|
|
if (srcpad)
|
|
gst_object_unref (srcpad);
|
|
srcpad = NULL;
|
|
if (destpad)
|
|
gst_object_unref (destpad);
|
|
destpad = NULL;
|
|
} else {
|
|
if (srcpad)
|
|
gst_object_unref (srcpad);
|
|
srcpad = NULL;
|
|
}
|
|
|
|
if (destpad) {
|
|
/* loop through the existing pads in the destination */
|
|
do {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "trying dest pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (destpad));
|
|
if ((GST_PAD_DIRECTION (destpad) == GST_PAD_SINK) &&
|
|
(GST_PAD_PEER (destpad) == NULL)) {
|
|
GstPad *temp = gst_element_get_compatible_pad (src, destpad, NULL);
|
|
|
|
if (temp && pad_link_maybe_ghosting (temp, destpad)) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "linked pad %s:%s to pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (temp), GST_DEBUG_PAD_NAME (destpad));
|
|
gst_object_unref (temp);
|
|
gst_object_unref (destpad);
|
|
if (srcpad)
|
|
gst_object_unref (srcpad);
|
|
return TRUE;
|
|
}
|
|
if (temp) {
|
|
gst_object_unref (temp);
|
|
}
|
|
}
|
|
if (destpads) {
|
|
destpads = g_list_next (destpads);
|
|
if (destpads) {
|
|
gst_object_unref (destpad);
|
|
destpad = GST_PAD_CAST (destpads->data);
|
|
gst_object_ref (destpad);
|
|
}
|
|
}
|
|
} while (destpads);
|
|
}
|
|
|
|
if (destpadname) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "no link possible from %s to %s:%s",
|
|
GST_ELEMENT_NAME (src), GST_DEBUG_PAD_NAME (destpad));
|
|
gst_object_unref (destpad);
|
|
if (srcpad)
|
|
gst_object_unref (srcpad);
|
|
return FALSE;
|
|
} else {
|
|
if (srcpad)
|
|
gst_object_unref (srcpad);
|
|
srcpad = NULL;
|
|
if (destpad)
|
|
gst_object_unref (destpad);
|
|
destpad = NULL;
|
|
}
|
|
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
|
|
"we might have request pads on both sides, checking...");
|
|
srctempls = gst_element_class_get_pad_template_list (srcclass);
|
|
desttempls = gst_element_class_get_pad_template_list (destclass);
|
|
|
|
if (srctempls && desttempls) {
|
|
while (srctempls) {
|
|
srctempl = (GstPadTemplate *) srctempls->data;
|
|
if (srctempl->presence == GST_PAD_REQUEST) {
|
|
for (l = desttempls; l; l = l->next) {
|
|
desttempl = (GstPadTemplate *) l->data;
|
|
if (desttempl->presence == GST_PAD_REQUEST &&
|
|
desttempl->direction != srctempl->direction) {
|
|
if (gst_caps_is_always_compatible (gst_pad_template_get_caps
|
|
(srctempl), gst_pad_template_get_caps (desttempl))) {
|
|
srcpad =
|
|
gst_element_get_request_pad (src, srctempl->name_template);
|
|
destpad =
|
|
gst_element_get_request_pad (dest, desttempl->name_template);
|
|
if (pad_link_maybe_ghosting (srcpad, destpad)) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
|
|
"linked pad %s:%s to pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (destpad));
|
|
gst_object_unref (srcpad);
|
|
gst_object_unref (destpad);
|
|
return TRUE;
|
|
}
|
|
/* it failed, so we release the request pads */
|
|
gst_element_release_request_pad (src, srcpad);
|
|
gst_element_release_request_pad (dest, destpad);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
srctempls = srctempls->next;
|
|
}
|
|
}
|
|
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "no link possible from %s to %s",
|
|
GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (dest));
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* gst_element_link_pads_filtered:
|
|
* @src: a #GstElement containing the source pad.
|
|
* @srcpadname: the name of the #GstPad in source element or NULL for any pad.
|
|
* @dest: the #GstElement containing the destination pad.
|
|
* @destpadname: the name of the #GstPad in destination element or NULL for any pad.
|
|
* @filter: the #GstCaps to filter the link, or #NULL for no filter.
|
|
*
|
|
* Links the two named pads of the source and destination elements. Side effect
|
|
* is that if one of the pads has no parent, it becomes a child of the parent of
|
|
* the other element. If they have different parents, the link fails. If @caps
|
|
* is not #NULL, makes sure that the caps of the link is a subset of @caps.
|
|
*
|
|
* Returns: TRUE if the pads could be linked, FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_element_link_pads_filtered (GstElement * src, const gchar * srcpadname,
|
|
GstElement * dest, const gchar * destpadname, GstCaps * filter)
|
|
{
|
|
/* checks */
|
|
g_return_val_if_fail (GST_IS_ELEMENT (src), FALSE);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (dest), FALSE);
|
|
g_return_val_if_fail (filter == NULL || GST_IS_CAPS (filter), FALSE);
|
|
|
|
if (filter) {
|
|
GstElement *capsfilter;
|
|
GstObject *parent;
|
|
GstState state, pending;
|
|
|
|
capsfilter = gst_element_factory_make ("capsfilter", NULL);
|
|
if (!capsfilter) {
|
|
GST_ERROR ("Could not make a capsfilter");
|
|
return FALSE;
|
|
}
|
|
|
|
parent = gst_object_get_parent (GST_OBJECT (src));
|
|
g_return_val_if_fail (GST_IS_BIN (parent), FALSE);
|
|
|
|
gst_element_get_state (GST_ELEMENT_CAST (parent), &state, &pending, 0);
|
|
|
|
if (!gst_bin_add (GST_BIN (parent), capsfilter)) {
|
|
GST_ERROR ("Could not add capsfilter");
|
|
gst_object_unref (capsfilter);
|
|
gst_object_unref (parent);
|
|
return FALSE;
|
|
}
|
|
|
|
if (pending != GST_STATE_VOID_PENDING)
|
|
state = pending;
|
|
|
|
gst_element_set_state (capsfilter, state);
|
|
|
|
gst_object_unref (parent);
|
|
|
|
g_object_set (capsfilter, "caps", filter, NULL);
|
|
|
|
if (gst_element_link_pads (src, srcpadname, capsfilter, "sink")
|
|
&& gst_element_link_pads (capsfilter, "src", dest, destpadname)) {
|
|
return TRUE;
|
|
} else {
|
|
GST_INFO ("Could not link elements");
|
|
gst_bin_remove (GST_BIN (GST_OBJECT_PARENT (capsfilter)), capsfilter);
|
|
/* will unref and unlink as appropriate */
|
|
return FALSE;
|
|
}
|
|
} else {
|
|
return gst_element_link_pads (src, srcpadname, dest, destpadname);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_link:
|
|
* @src: a #GstElement containing the source pad.
|
|
* @dest: the #GstElement containing the destination pad.
|
|
*
|
|
* Links @src to @dest. The link must be from source to
|
|
* destination; the other direction will not be tried. The function looks for
|
|
* existing pads that aren't linked yet. It will request new pads if necessary.
|
|
* If multiple links are possible, only one is established.
|
|
*
|
|
* Returns: TRUE if the elements could be linked, FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_element_link (GstElement * src, GstElement * dest)
|
|
{
|
|
return gst_element_link_pads_filtered (src, NULL, dest, NULL, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_element_link_many:
|
|
* @element_1: the first #GstElement in the link chain.
|
|
* @element_2: the second #GstElement in the link chain.
|
|
* @...: the NULL-terminated list of elements to link in order.
|
|
*
|
|
* Chain together a series of elements. Uses gst_element_link().
|
|
*
|
|
* Returns: TRUE on success, FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_element_link_many (GstElement * element_1, GstElement * element_2, ...)
|
|
{
|
|
va_list args;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element_1), FALSE);
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element_2), FALSE);
|
|
|
|
va_start (args, element_2);
|
|
|
|
while (element_2) {
|
|
if (!gst_element_link (element_1, element_2))
|
|
return FALSE;
|
|
|
|
element_1 = element_2;
|
|
element_2 = va_arg (args, GstElement *);
|
|
}
|
|
|
|
va_end (args);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_element_link_filtered:
|
|
* @src: a #GstElement containing the source pad.
|
|
* @dest: the #GstElement containing the destination pad.
|
|
* @filter: the #GstCaps to filter the link, or #NULL for no filter.
|
|
*
|
|
* Links @src to @dest using the given caps as filtercaps.
|
|
* The link must be from source to
|
|
* destination; the other direction will not be tried. The function looks for
|
|
* existing pads that aren't linked yet. It will request new pads if necessary.
|
|
* If multiple links are possible, only one is established.
|
|
*
|
|
* Returns: TRUE if the pads could be linked, FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_element_link_filtered (GstElement * src, GstElement * dest,
|
|
GstCaps * filter)
|
|
{
|
|
return gst_element_link_pads_filtered (src, NULL, dest, NULL, filter);
|
|
}
|
|
|
|
/**
|
|
* gst_element_unlink_pads:
|
|
* @src: a #GstElement containing the source pad.
|
|
* @srcpadname: the name of the #GstPad in source element.
|
|
* @dest: a #GstElement containing the destination pad.
|
|
* @destpadname: the name of the #GstPad in destination element.
|
|
*
|
|
* Unlinks the two named pads of the source and destination elements.
|
|
*/
|
|
void
|
|
gst_element_unlink_pads (GstElement * src, const gchar * srcpadname,
|
|
GstElement * dest, const gchar * destpadname)
|
|
{
|
|
GstPad *srcpad, *destpad;
|
|
|
|
g_return_if_fail (src != NULL);
|
|
g_return_if_fail (GST_IS_ELEMENT (src));
|
|
g_return_if_fail (srcpadname != NULL);
|
|
g_return_if_fail (dest != NULL);
|
|
g_return_if_fail (GST_IS_ELEMENT (dest));
|
|
g_return_if_fail (destpadname != NULL);
|
|
|
|
/* obtain the pads requested */
|
|
srcpad = gst_element_get_pad (src, srcpadname);
|
|
if (srcpad == NULL) {
|
|
GST_WARNING_OBJECT (src, "source element has no pad \"%s\"", srcpadname);
|
|
return;
|
|
}
|
|
destpad = gst_element_get_pad (dest, destpadname);
|
|
if (destpad == NULL) {
|
|
GST_WARNING_OBJECT (dest, "destination element has no pad \"%s\"",
|
|
destpadname);
|
|
gst_object_unref (srcpad);
|
|
return;
|
|
}
|
|
|
|
/* we're satisified they can be unlinked, let's do it */
|
|
gst_pad_unlink (srcpad, destpad);
|
|
gst_object_unref (srcpad);
|
|
gst_object_unref (destpad);
|
|
}
|
|
|
|
/**
|
|
* gst_element_unlink_many:
|
|
* @element_1: the first #GstElement in the link chain.
|
|
* @element_2: the second #GstElement in the link chain.
|
|
* @...: the NULL-terminated list of elements to unlink in order.
|
|
*
|
|
* Unlinks a series of elements. Uses gst_element_unlink().
|
|
*/
|
|
void
|
|
gst_element_unlink_many (GstElement * element_1, GstElement * element_2, ...)
|
|
{
|
|
va_list args;
|
|
|
|
g_return_if_fail (element_1 != NULL && element_2 != NULL);
|
|
g_return_if_fail (GST_IS_ELEMENT (element_1) && GST_IS_ELEMENT (element_2));
|
|
|
|
va_start (args, element_2);
|
|
|
|
while (element_2) {
|
|
gst_element_unlink (element_1, element_2);
|
|
|
|
element_1 = element_2;
|
|
element_2 = va_arg (args, GstElement *);
|
|
}
|
|
|
|
va_end (args);
|
|
}
|
|
|
|
/**
|
|
* gst_element_unlink:
|
|
* @src: the source #GstElement to unlink.
|
|
* @dest: the sink #GstElement to unlink.
|
|
*
|
|
* Unlinks all source pads of the source element with all sink pads
|
|
* of the sink element to which they are linked.
|
|
*/
|
|
void
|
|
gst_element_unlink (GstElement * src, GstElement * dest)
|
|
{
|
|
GstIterator *pads;
|
|
gboolean done = FALSE;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (src));
|
|
g_return_if_fail (GST_IS_ELEMENT (dest));
|
|
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "unlinking \"%s\" and \"%s\"",
|
|
GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (dest));
|
|
|
|
pads = gst_element_iterate_pads (src);
|
|
while (!done) {
|
|
gpointer data;
|
|
|
|
switch (gst_iterator_next (pads, &data)) {
|
|
case GST_ITERATOR_OK:
|
|
{
|
|
GstPad *pad = GST_PAD_CAST (data);
|
|
|
|
if (GST_PAD_IS_SRC (pad)) {
|
|
GstPad *peerpad = gst_pad_get_peer (pad);
|
|
|
|
/* see if the pad is connected and is really a pad
|
|
* of dest */
|
|
if (peerpad) {
|
|
GstElement *peerelem;
|
|
|
|
peerelem = gst_pad_get_parent_element (peerpad);
|
|
|
|
if (peerelem == dest) {
|
|
gst_pad_unlink (pad, peerpad);
|
|
}
|
|
if (peerelem)
|
|
gst_object_unref (peerelem);
|
|
|
|
gst_object_unref (peerpad);
|
|
}
|
|
}
|
|
gst_object_unref (pad);
|
|
break;
|
|
}
|
|
case GST_ITERATOR_RESYNC:
|
|
gst_iterator_resync (pads);
|
|
break;
|
|
case GST_ITERATOR_DONE:
|
|
done = TRUE;
|
|
break;
|
|
default:
|
|
g_assert_not_reached ();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_query_position:
|
|
* @element: a #GstElement to invoke the position query on.
|
|
* @format: a pointer to the #GstFormat asked for.
|
|
* On return contains the #GstFormat used.
|
|
* @cur: A location in which to store the current position, or NULL.
|
|
*
|
|
* Queries an element for the stream position.
|
|
*
|
|
* Returns: TRUE if the query could be performed.
|
|
*/
|
|
gboolean
|
|
gst_element_query_position (GstElement * element, GstFormat * format,
|
|
gint64 * cur)
|
|
{
|
|
GstQuery *query;
|
|
gboolean ret;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (format != NULL, FALSE);
|
|
|
|
query = gst_query_new_position (*format);
|
|
ret = gst_element_query (element, query);
|
|
|
|
if (ret)
|
|
gst_query_parse_position (query, format, cur);
|
|
|
|
gst_query_unref (query);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_element_query_duration:
|
|
* @element: a #GstElement to invoke the duration query on.
|
|
* @format: a pointer to the #GstFormat asked for.
|
|
* On return contains the #GstFormat used.
|
|
* @duration: A location in which to store the total duration, or NULL.
|
|
*
|
|
* Queries an element for the total stream duration.
|
|
*
|
|
* Returns: TRUE if the query could be performed.
|
|
*/
|
|
gboolean
|
|
gst_element_query_duration (GstElement * element, GstFormat * format,
|
|
gint64 * duration)
|
|
{
|
|
GstQuery *query;
|
|
gboolean ret;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (format != NULL, FALSE);
|
|
|
|
query = gst_query_new_duration (*format);
|
|
ret = gst_element_query (element, query);
|
|
|
|
if (ret)
|
|
gst_query_parse_duration (query, format, duration);
|
|
|
|
gst_query_unref (query);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_element_query_convert:
|
|
* @element: a #GstElement to invoke the convert query on.
|
|
* @src_format: a #GstFormat to convert from.
|
|
* @src_val: a value to convert.
|
|
* @dest_format: a pointer to the #GstFormat to convert to.
|
|
* @dest_val: a pointer to the result.
|
|
*
|
|
* Queries an element to convert @src_val in @src_format to @dest_format.
|
|
*
|
|
* Returns: TRUE if the query could be performed.
|
|
*/
|
|
gboolean
|
|
gst_element_query_convert (GstElement * element, GstFormat src_format,
|
|
gint64 src_val, GstFormat * dest_format, gint64 * dest_val)
|
|
{
|
|
GstQuery *query;
|
|
gboolean ret;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (dest_format != NULL, FALSE);
|
|
g_return_val_if_fail (dest_val != NULL, FALSE);
|
|
|
|
if (*dest_format == src_format) {
|
|
*dest_val = src_val;
|
|
return TRUE;
|
|
}
|
|
|
|
query = gst_query_new_convert (src_format, src_val, *dest_format);
|
|
ret = gst_element_query (element, query);
|
|
|
|
if (ret)
|
|
gst_query_parse_convert (query, NULL, NULL, dest_format, dest_val);
|
|
|
|
gst_query_unref (query);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_can_link:
|
|
* @srcpad: the source #GstPad to link.
|
|
* @sinkpad: the sink #GstPad to link.
|
|
*
|
|
* Checks if the source pad and the sink pad can be linked.
|
|
* Both @srcpad and @sinkpad must be unlinked.
|
|
*
|
|
* Returns: TRUE if the pads can be linked, FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_pad_can_link (GstPad * srcpad, GstPad * sinkpad)
|
|
{
|
|
/* FIXME This function is gross. It's almost a direct copy of
|
|
* gst_pad_link_filtered(). Any decent programmer would attempt
|
|
* to merge the two functions, which I will do some day. --ds
|
|
*/
|
|
|
|
/* generic checks */
|
|
g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
|
|
g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
|
|
|
|
GST_CAT_INFO (GST_CAT_PADS, "trying to link %s:%s and %s:%s",
|
|
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
|
|
|
|
/* FIXME: shouldn't we convert this to g_return_val_if_fail? */
|
|
if (GST_PAD_PEER (srcpad) != NULL) {
|
|
GST_CAT_INFO (GST_CAT_PADS, "Source pad %s:%s has a peer, failed",
|
|
GST_DEBUG_PAD_NAME (srcpad));
|
|
return FALSE;
|
|
}
|
|
if (GST_PAD_PEER (sinkpad) != NULL) {
|
|
GST_CAT_INFO (GST_CAT_PADS, "Sink pad %s:%s has a peer, failed",
|
|
GST_DEBUG_PAD_NAME (sinkpad));
|
|
return FALSE;
|
|
}
|
|
if (!GST_PAD_IS_SRC (srcpad)) {
|
|
GST_CAT_INFO (GST_CAT_PADS, "Src pad %s:%s is not source pad, failed",
|
|
GST_DEBUG_PAD_NAME (srcpad));
|
|
return FALSE;
|
|
}
|
|
if (!GST_PAD_IS_SINK (sinkpad)) {
|
|
GST_CAT_INFO (GST_CAT_PADS, "Sink pad %s:%s is not sink pad, failed",
|
|
GST_DEBUG_PAD_NAME (sinkpad));
|
|
return FALSE;
|
|
}
|
|
if (GST_PAD_PARENT (srcpad) == NULL) {
|
|
GST_CAT_INFO (GST_CAT_PADS, "Src pad %s:%s has no parent, failed",
|
|
GST_DEBUG_PAD_NAME (srcpad));
|
|
return FALSE;
|
|
}
|
|
if (GST_PAD_PARENT (sinkpad) == NULL) {
|
|
GST_CAT_INFO (GST_CAT_PADS, "Sink pad %s:%s has no parent, failed",
|
|
GST_DEBUG_PAD_NAME (srcpad));
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_use_fixed_caps:
|
|
* @pad: the pad to use
|
|
*
|
|
* A helper function you can use that sets the
|
|
* @gst_pad_get_fixed_caps_func as the getcaps function for the
|
|
* pad. This way the function will always return the negotiated caps
|
|
* or in case the pad is not negotiated, the padtemplate caps.
|
|
*
|
|
* Use this function on a pad that, once _set_caps() has been called
|
|
* on it, cannot be renegotiated to something else.
|
|
*/
|
|
void
|
|
gst_pad_use_fixed_caps (GstPad * pad)
|
|
{
|
|
gst_pad_set_getcaps_function (pad, gst_pad_get_fixed_caps_func);
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_fixed_caps_func:
|
|
* @pad: the pad to use
|
|
*
|
|
* A helper function you can use as a GetCaps function that
|
|
* will return the currently negotiated caps or the padtemplate
|
|
* when NULL.
|
|
*
|
|
* Returns: The currently negotiated caps or the padtemplate.
|
|
*/
|
|
GstCaps *
|
|
gst_pad_get_fixed_caps_func (GstPad * pad)
|
|
{
|
|
GstCaps *result;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
if (GST_PAD_CAPS (pad)) {
|
|
result = GST_PAD_CAPS (pad);
|
|
|
|
GST_CAT_DEBUG (GST_CAT_CAPS,
|
|
"using pad caps %p %" GST_PTR_FORMAT, result, result);
|
|
|
|
result = gst_caps_ref (result);
|
|
goto done;
|
|
}
|
|
if (GST_PAD_PAD_TEMPLATE (pad)) {
|
|
GstPadTemplate *templ = GST_PAD_PAD_TEMPLATE (pad);
|
|
|
|
result = GST_PAD_TEMPLATE_CAPS (templ);
|
|
GST_CAT_DEBUG (GST_CAT_CAPS,
|
|
"using pad template %p with caps %p %" GST_PTR_FORMAT, templ, result,
|
|
result);
|
|
|
|
result = gst_caps_ref (result);
|
|
goto done;
|
|
}
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "pad has no caps");
|
|
result = gst_caps_new_empty ();
|
|
|
|
done:
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_parent_element:
|
|
* @pad: a pad
|
|
*
|
|
* Gets the parent of @pad, cast to a #GstElement. If a @pad has no parent or
|
|
* its parent is not an element, return NULL.
|
|
*
|
|
* Returns: The parent of the pad. The caller has a reference on the parent, so
|
|
* unref when you're finished with it.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstElement *
|
|
gst_pad_get_parent_element (GstPad * pad)
|
|
{
|
|
GstObject *p;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
p = gst_object_get_parent (GST_OBJECT_CAST (pad));
|
|
|
|
if (p && !GST_IS_ELEMENT (p)) {
|
|
gst_object_unref (p);
|
|
p = NULL;
|
|
}
|
|
return GST_ELEMENT_CAST (p);
|
|
}
|
|
|
|
/**
|
|
* gst_object_default_error:
|
|
* @source: the #GstObject that initiated the error.
|
|
* @error: the GError.
|
|
* @debug: an additional debug information string, or NULL.
|
|
*
|
|
* A default error function.
|
|
*
|
|
* The default handler will simply print the error string using g_print.
|
|
*/
|
|
void
|
|
gst_object_default_error (GstObject * source, GError * error, gchar * debug)
|
|
{
|
|
gchar *name = gst_object_get_path_string (source);
|
|
|
|
g_print (_("ERROR: from element %s: %s\n"), name, error->message);
|
|
if (debug)
|
|
g_print (_("Additional debug info:\n%s\n"), debug);
|
|
|
|
g_free (name);
|
|
}
|
|
|
|
/**
|
|
* gst_bin_add_many:
|
|
* @bin: a #GstBin
|
|
* @element_1: the #GstElement element to add to the bin
|
|
* @...: additional elements to add to the bin
|
|
*
|
|
* Adds a NULL-terminated list of elements to a bin. This function is
|
|
* equivalent to calling gst_bin_add() for each member of the list.
|
|
*/
|
|
void
|
|
gst_bin_add_many (GstBin * bin, GstElement * element_1, ...)
|
|
{
|
|
va_list args;
|
|
|
|
g_return_if_fail (GST_IS_BIN (bin));
|
|
g_return_if_fail (GST_IS_ELEMENT (element_1));
|
|
|
|
va_start (args, element_1);
|
|
|
|
while (element_1) {
|
|
gst_bin_add (bin, element_1);
|
|
|
|
element_1 = va_arg (args, GstElement *);
|
|
}
|
|
|
|
va_end (args);
|
|
}
|
|
|
|
/**
|
|
* gst_bin_remove_many:
|
|
* @bin: a #GstBin
|
|
* @element_1: the first #GstElement to remove from the bin
|
|
* @...: NULL-terminated list of elements to remove from the bin
|
|
*
|
|
* Remove a list of elements from a bin. This function is equivalent
|
|
* to calling gst_bin_remove() with each member of the list.
|
|
*/
|
|
void
|
|
gst_bin_remove_many (GstBin * bin, GstElement * element_1, ...)
|
|
{
|
|
va_list args;
|
|
|
|
g_return_if_fail (GST_IS_BIN (bin));
|
|
g_return_if_fail (GST_IS_ELEMENT (element_1));
|
|
|
|
va_start (args, element_1);
|
|
|
|
while (element_1) {
|
|
gst_bin_remove (bin, element_1);
|
|
|
|
element_1 = va_arg (args, GstElement *);
|
|
}
|
|
|
|
va_end (args);
|
|
}
|
|
|
|
static void
|
|
gst_element_populate_std_props (GObjectClass * klass, const gchar * prop_name,
|
|
guint arg_id, GParamFlags flags)
|
|
{
|
|
GQuark prop_id = g_quark_from_string (prop_name);
|
|
GParamSpec *pspec;
|
|
|
|
static GQuark fd_id = 0;
|
|
static GQuark blocksize_id;
|
|
static GQuark bytesperread_id;
|
|
static GQuark dump_id;
|
|
static GQuark filesize_id;
|
|
static GQuark mmapsize_id;
|
|
static GQuark location_id;
|
|
static GQuark offset_id;
|
|
static GQuark silent_id;
|
|
static GQuark touch_id;
|
|
|
|
if (!fd_id) {
|
|
fd_id = g_quark_from_static_string ("fd");
|
|
blocksize_id = g_quark_from_static_string ("blocksize");
|
|
bytesperread_id = g_quark_from_static_string ("bytesperread");
|
|
dump_id = g_quark_from_static_string ("dump");
|
|
filesize_id = g_quark_from_static_string ("filesize");
|
|
mmapsize_id = g_quark_from_static_string ("mmapsize");
|
|
location_id = g_quark_from_static_string ("location");
|
|
offset_id = g_quark_from_static_string ("offset");
|
|
silent_id = g_quark_from_static_string ("silent");
|
|
touch_id = g_quark_from_static_string ("touch");
|
|
}
|
|
|
|
if (prop_id == fd_id) {
|
|
pspec = g_param_spec_int ("fd", "File-descriptor",
|
|
"File-descriptor for the file being read", 0, G_MAXINT, 0, flags);
|
|
} else if (prop_id == blocksize_id) {
|
|
pspec = g_param_spec_ulong ("blocksize", "Block Size",
|
|
"Block size to read per buffer", 0, G_MAXULONG, 4096, flags);
|
|
|
|
} else if (prop_id == bytesperread_id) {
|
|
pspec = g_param_spec_int ("bytesperread", "Bytes per read",
|
|
"Number of bytes to read per buffer", G_MININT, G_MAXINT, 0, flags);
|
|
|
|
} else if (prop_id == dump_id) {
|
|
pspec = g_param_spec_boolean ("dump", "Dump",
|
|
"Dump bytes to stdout", FALSE, flags);
|
|
|
|
} else if (prop_id == filesize_id) {
|
|
pspec = g_param_spec_int64 ("filesize", "File Size",
|
|
"Size of the file being read", 0, G_MAXINT64, 0, flags);
|
|
|
|
} else if (prop_id == mmapsize_id) {
|
|
pspec = g_param_spec_ulong ("mmapsize", "mmap() Block Size",
|
|
"Size in bytes of mmap()d regions", 0, G_MAXULONG, 4 * 1048576, flags);
|
|
|
|
} else if (prop_id == location_id) {
|
|
pspec = g_param_spec_string ("location", "File Location",
|
|
"Location of the file to read", NULL, flags);
|
|
|
|
} else if (prop_id == offset_id) {
|
|
pspec = g_param_spec_int64 ("offset", "File Offset",
|
|
"Byte offset of current read pointer", 0, G_MAXINT64, 0, flags);
|
|
|
|
} else if (prop_id == silent_id) {
|
|
pspec = g_param_spec_boolean ("silent", "Silent", "Don't produce events",
|
|
FALSE, flags);
|
|
|
|
} else if (prop_id == touch_id) {
|
|
pspec = g_param_spec_boolean ("touch", "Touch read data",
|
|
"Touch data to force disk read before " "push ()", TRUE, flags);
|
|
} else {
|
|
g_warning ("Unknown - 'standard' property '%s' id %d from klass %s",
|
|
prop_name, arg_id, g_type_name (G_OBJECT_CLASS_TYPE (klass)));
|
|
pspec = NULL;
|
|
}
|
|
|
|
if (pspec) {
|
|
g_object_class_install_property (klass, arg_id, pspec);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_class_install_std_props:
|
|
* @klass: the #GstElementClass to add the properties to.
|
|
* @first_name: the name of the first property.
|
|
* in a NULL terminated
|
|
* @...: the id and flags of the first property, followed by
|
|
* further 'name', 'id', 'flags' triplets and terminated by NULL.
|
|
*
|
|
* Adds a list of standardized properties with types to the @klass.
|
|
* the id is for the property switch in your get_prop method, and
|
|
* the flags determine readability / writeability.
|
|
**/
|
|
void
|
|
gst_element_class_install_std_props (GstElementClass * klass,
|
|
const gchar * first_name, ...)
|
|
{
|
|
const char *name;
|
|
|
|
va_list args;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
|
|
|
|
va_start (args, first_name);
|
|
|
|
name = first_name;
|
|
|
|
while (name) {
|
|
int arg_id = va_arg (args, int);
|
|
int flags = va_arg (args, int);
|
|
|
|
gst_element_populate_std_props ((GObjectClass *) klass, name, arg_id,
|
|
flags);
|
|
|
|
name = va_arg (args, char *);
|
|
}
|
|
|
|
va_end (args);
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_buffer_merge:
|
|
* @buf1: the first source #GstBuffer to merge.
|
|
* @buf2: the second source #GstBuffer to merge.
|
|
*
|
|
* Create a new buffer that is the concatenation of the two source
|
|
* buffers. The original source buffers will not be modified or
|
|
* unref'd. Make sure you unref the source buffers if they are not used
|
|
* anymore afterwards.
|
|
*
|
|
* If the buffers point to contiguous areas of memory, the buffer
|
|
* is created without copying the data.
|
|
*
|
|
* Returns: the new #GstBuffer which is the concatenation of the source buffers.
|
|
*/
|
|
GstBuffer *
|
|
gst_buffer_merge (GstBuffer * buf1, GstBuffer * buf2)
|
|
{
|
|
GstBuffer *result;
|
|
|
|
/* we're just a specific case of the more general gst_buffer_span() */
|
|
result = gst_buffer_span (buf1, 0, buf2, buf1->size + buf2->size);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_join:
|
|
* @buf1: the first source #GstBuffer.
|
|
* @buf2: the second source #GstBuffer.
|
|
*
|
|
* Create a new buffer that is the concatenation of the two source
|
|
* buffers, and unrefs the original source buffers.
|
|
*
|
|
* If the buffers point to contiguous areas of memory, the buffer
|
|
* is created without copying the data.
|
|
*
|
|
* Returns: the new #GstBuffer which is the concatenation of the source buffers.
|
|
*/
|
|
GstBuffer *
|
|
gst_buffer_join (GstBuffer * buf1, GstBuffer * buf2)
|
|
{
|
|
GstBuffer *result;
|
|
|
|
result = gst_buffer_span (buf1, 0, buf2, buf1->size + buf2->size);
|
|
gst_buffer_unref (buf1);
|
|
gst_buffer_unref (buf2);
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_buffer_stamp:
|
|
* @dest: buffer to stamp
|
|
* @src: buffer to stamp from
|
|
*
|
|
* Copies additional information (the timestamp, duration, and offset start
|
|
* and end) from one buffer to the other.
|
|
*
|
|
* This function does not copy any buffer flags or caps.
|
|
*/
|
|
void
|
|
gst_buffer_stamp (GstBuffer * dest, const GstBuffer * src)
|
|
{
|
|
g_return_if_fail (dest != NULL);
|
|
g_return_if_fail (src != NULL);
|
|
|
|
GST_BUFFER_TIMESTAMP (dest) = GST_BUFFER_TIMESTAMP (src);
|
|
GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src);
|
|
GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src);
|
|
GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src);
|
|
}
|
|
|
|
static gboolean
|
|
intersect_caps_func (GstPad * pad, GValue * ret, GstPad * orig)
|
|
{
|
|
if (pad != orig) {
|
|
GstCaps *peercaps, *existing;
|
|
|
|
existing = g_value_get_pointer (ret);
|
|
peercaps = gst_pad_peer_get_caps (pad);
|
|
if (peercaps == NULL)
|
|
peercaps = gst_caps_new_any ();
|
|
g_value_set_pointer (ret, gst_caps_intersect (existing, peercaps));
|
|
gst_caps_unref (existing);
|
|
gst_caps_unref (peercaps);
|
|
}
|
|
gst_object_unref (pad);
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_proxy_getcaps:
|
|
* @pad: a #GstPad to proxy.
|
|
*
|
|
* Calls gst_pad_get_allowed_caps() for every other pad belonging to the
|
|
* same element as @pad, and returns the intersection of the results.
|
|
*
|
|
* This function is useful as a default getcaps function for an element
|
|
* that can handle any stream format, but requires all its pads to have
|
|
* the same caps. Two such elements are tee and aggregator.
|
|
*
|
|
* Returns: the intersection of the other pads' allowed caps.
|
|
*/
|
|
GstCaps *
|
|
gst_pad_proxy_getcaps (GstPad * pad)
|
|
{
|
|
GstElement *element;
|
|
GstCaps *caps, *intersected;
|
|
GstIterator *iter;
|
|
GstIteratorResult res;
|
|
GValue ret = { 0, };
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
GST_DEBUG ("proxying getcaps for %s:%s", GST_DEBUG_PAD_NAME (pad));
|
|
|
|
element = gst_pad_get_parent_element (pad);
|
|
if (element == NULL)
|
|
return NULL;
|
|
|
|
iter = gst_element_iterate_pads (element);
|
|
|
|
g_value_init (&ret, G_TYPE_POINTER);
|
|
g_value_set_pointer (&ret, gst_caps_new_any ());
|
|
|
|
res = gst_iterator_fold (iter, (GstIteratorFoldFunction) intersect_caps_func,
|
|
&ret, pad);
|
|
gst_iterator_free (iter);
|
|
|
|
if (res != GST_ITERATOR_DONE)
|
|
goto pads_changed;
|
|
|
|
gst_object_unref (element);
|
|
|
|
caps = g_value_get_pointer (&ret);
|
|
g_value_unset (&ret);
|
|
|
|
intersected = gst_caps_intersect (caps, gst_pad_get_pad_template_caps (pad));
|
|
gst_caps_unref (caps);
|
|
|
|
return intersected;
|
|
|
|
/* ERRORS */
|
|
pads_changed:
|
|
{
|
|
g_warning ("Pad list changed during capsnego for element %s",
|
|
GST_ELEMENT_NAME (element));
|
|
gst_object_unref (element);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
typedef struct
|
|
{
|
|
GstPad *orig;
|
|
GstCaps *caps;
|
|
} LinkData;
|
|
|
|
static gboolean
|
|
link_fold_func (GstPad * pad, GValue * ret, LinkData * data)
|
|
{
|
|
gboolean success = TRUE;
|
|
|
|
if (pad != data->orig) {
|
|
success = gst_pad_set_caps (pad, data->caps);
|
|
g_value_set_boolean (ret, success);
|
|
}
|
|
gst_object_unref (pad);
|
|
|
|
return success;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_proxy_setcaps
|
|
* @pad: a #GstPad to proxy from
|
|
* @caps: the #GstCaps to link with
|
|
*
|
|
* Calls gst_pad_set_caps() for every other pad belonging to the
|
|
* same element as @pad. If gst_pad_set_caps() fails on any pad,
|
|
* the proxy setcaps fails. May be used only during negotiation.
|
|
*
|
|
* Returns: TRUE if sucessful
|
|
*/
|
|
gboolean
|
|
gst_pad_proxy_setcaps (GstPad * pad, GstCaps * caps)
|
|
{
|
|
GstElement *element;
|
|
GstIterator *iter;
|
|
GstIteratorResult res;
|
|
GValue ret = { 0, };
|
|
LinkData data;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (caps != NULL, FALSE);
|
|
|
|
GST_DEBUG ("proxying pad link for %s:%s", GST_DEBUG_PAD_NAME (pad));
|
|
|
|
element = gst_pad_get_parent_element (pad);
|
|
if (element == NULL)
|
|
return FALSE;
|
|
|
|
iter = gst_element_iterate_pads (element);
|
|
|
|
g_value_init (&ret, G_TYPE_BOOLEAN);
|
|
g_value_set_boolean (&ret, TRUE);
|
|
data.orig = pad;
|
|
data.caps = caps;
|
|
|
|
res = gst_iterator_fold (iter, (GstIteratorFoldFunction) link_fold_func,
|
|
&ret, &data);
|
|
gst_iterator_free (iter);
|
|
|
|
if (res != GST_ITERATOR_DONE)
|
|
goto pads_changed;
|
|
|
|
gst_object_unref (element);
|
|
|
|
/* ok not to unset the gvalue */
|
|
return g_value_get_boolean (&ret);
|
|
|
|
/* ERRORS */
|
|
pads_changed:
|
|
{
|
|
g_warning ("Pad list changed during proxy_pad_link for element %s",
|
|
GST_ELEMENT_NAME (element));
|
|
gst_object_unref (element);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_query_position:
|
|
* @pad: a #GstPad to invoke the position query on.
|
|
* @format: a pointer to the #GstFormat asked for.
|
|
* On return contains the #GstFormat used.
|
|
* @cur: A location in which to store the current position, or NULL.
|
|
*
|
|
* Queries a pad for the stream position.
|
|
*
|
|
* Returns: TRUE if the query could be performed.
|
|
*/
|
|
gboolean
|
|
gst_pad_query_position (GstPad * pad, GstFormat * format, gint64 * cur)
|
|
{
|
|
GstQuery *query;
|
|
gboolean ret;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (format != NULL, FALSE);
|
|
|
|
query = gst_query_new_position (*format);
|
|
ret = gst_pad_query (pad, query);
|
|
|
|
if (ret)
|
|
gst_query_parse_position (query, format, cur);
|
|
|
|
gst_query_unref (query);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_query_peer_position:
|
|
* @pad: a #GstPad on whose peer to invoke the position query on.
|
|
* Must be a sink pad.
|
|
* @format: a pointer to the #GstFormat asked for.
|
|
* On return contains the #GstFormat used.
|
|
* @cur: A location in which to store the current position, or NULL.
|
|
*
|
|
* Queries the peer of a given sink pad for the stream position.
|
|
*
|
|
* Returns: TRUE if the query could be performed.
|
|
*/
|
|
gboolean
|
|
gst_pad_query_peer_position (GstPad * pad, GstFormat * format, gint64 * cur)
|
|
{
|
|
gboolean ret = FALSE;
|
|
GstPad *peer;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (GST_PAD_IS_SINK (pad), FALSE);
|
|
g_return_val_if_fail (format != NULL, FALSE);
|
|
|
|
peer = gst_pad_get_peer (pad);
|
|
if (peer) {
|
|
ret = gst_pad_query_position (peer, format, cur);
|
|
gst_object_unref (peer);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_query_duration:
|
|
* @pad: a #GstPad to invoke the duration query on.
|
|
* @format: a pointer to the #GstFormat asked for.
|
|
* On return contains the #GstFormat used.
|
|
* @duration: A location in which to store the total duration, or NULL.
|
|
*
|
|
* Queries a pad for the total stream duration.
|
|
*
|
|
* Returns: TRUE if the query could be performed.
|
|
*/
|
|
gboolean
|
|
gst_pad_query_duration (GstPad * pad, GstFormat * format, gint64 * duration)
|
|
{
|
|
GstQuery *query;
|
|
gboolean ret;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (format != NULL, FALSE);
|
|
|
|
query = gst_query_new_duration (*format);
|
|
ret = gst_pad_query (pad, query);
|
|
|
|
if (ret)
|
|
gst_query_parse_duration (query, format, duration);
|
|
|
|
gst_query_unref (query);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_query_peer_duration:
|
|
* @pad: a #GstPad on whose peer pad to invoke the duration query on.
|
|
* Must be a sink pad.
|
|
* @format: a pointer to the #GstFormat asked for.
|
|
* On return contains the #GstFormat used.
|
|
* @duration: A location in which to store the total duration, or NULL.
|
|
*
|
|
* Queries the peer pad of a given sink pad for the total stream duration.
|
|
*
|
|
* Returns: TRUE if the query could be performed.
|
|
*/
|
|
gboolean
|
|
gst_pad_query_peer_duration (GstPad * pad, GstFormat * format,
|
|
gint64 * duration)
|
|
{
|
|
gboolean ret = FALSE;
|
|
GstPad *peer;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (GST_PAD_IS_SINK (pad), FALSE);
|
|
g_return_val_if_fail (format != NULL, FALSE);
|
|
|
|
peer = gst_pad_get_peer (pad);
|
|
if (peer) {
|
|
ret = gst_pad_query_duration (peer, format, duration);
|
|
gst_object_unref (peer);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_query_convert:
|
|
* @pad: a #GstPad to invoke the convert query on.
|
|
* @src_format: a #GstFormat to convert from.
|
|
* @src_val: a value to convert.
|
|
* @dest_format: a pointer to the #GstFormat to convert to.
|
|
* @dest_val: a pointer to the result.
|
|
*
|
|
* Queries a pad to convert @src_val in @src_format to @dest_format.
|
|
*
|
|
* Returns: TRUE if the query could be performed.
|
|
*/
|
|
gboolean
|
|
gst_pad_query_convert (GstPad * pad, GstFormat src_format, gint64 src_val,
|
|
GstFormat * dest_format, gint64 * dest_val)
|
|
{
|
|
GstQuery *query;
|
|
gboolean ret;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (src_val >= 0, FALSE);
|
|
g_return_val_if_fail (dest_format != NULL, FALSE);
|
|
g_return_val_if_fail (dest_val != NULL, FALSE);
|
|
|
|
if (*dest_format == src_format) {
|
|
*dest_val = src_val;
|
|
return TRUE;
|
|
}
|
|
|
|
query = gst_query_new_convert (src_format, src_val, *dest_format);
|
|
ret = gst_pad_query (pad, query);
|
|
|
|
if (ret)
|
|
gst_query_parse_convert (query, NULL, NULL, dest_format, dest_val);
|
|
|
|
gst_query_unref (query);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_query_peer_convert:
|
|
* @pad: a #GstPad, on whose peer pad to invoke the convert query on.
|
|
* Must be a sink pad.
|
|
* @src_format: a #GstFormat to convert from.
|
|
* @src_val: a value to convert.
|
|
* @dest_format: a pointer to the #GstFormat to convert to.
|
|
* @dest_val: a pointer to the result.
|
|
*
|
|
* Queries the peer pad of a given sink pad to convert @src_val in @src_format
|
|
* to @dest_format.
|
|
*
|
|
* Returns: TRUE if the query could be performed.
|
|
*/
|
|
gboolean
|
|
gst_pad_query_peer_convert (GstPad * pad, GstFormat src_format, gint64 src_val,
|
|
GstFormat * dest_format, gint64 * dest_val)
|
|
{
|
|
gboolean ret = FALSE;
|
|
GstPad *peer;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (GST_PAD_IS_SINK (pad), FALSE);
|
|
g_return_val_if_fail (src_val >= 0, FALSE);
|
|
g_return_val_if_fail (dest_format != NULL, FALSE);
|
|
g_return_val_if_fail (dest_val != NULL, FALSE);
|
|
|
|
peer = gst_pad_get_peer (pad);
|
|
if (peer) {
|
|
ret = gst_pad_query_convert (peer, src_format, src_val, dest_format,
|
|
dest_val);
|
|
gst_object_unref (peer);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_atomic_int_set:
|
|
* @atomic_int: pointer to an atomic integer
|
|
* @value: value to set
|
|
*
|
|
* Unconditionally sets the atomic integer to @value.
|
|
*/
|
|
void
|
|
gst_atomic_int_set (gint * atomic_int, gint value)
|
|
{
|
|
int ignore;
|
|
|
|
*atomic_int = value;
|
|
/* read acts as a memory barrier */
|
|
ignore = g_atomic_int_get (atomic_int);
|
|
}
|
|
|
|
/**
|
|
* gst_pad_add_data_probe:
|
|
* @pad: pad to add the data probe handler to
|
|
* @handler: function to call when data is passed over pad
|
|
* @data: data to pass along with the handler
|
|
*
|
|
* Adds a "data probe" to a pad. This function will be called whenever data
|
|
* passes through a pad. In this case data means both events and buffers. The
|
|
* probe will be called with the data as an argument, meaning @handler should
|
|
* have the same callback signature as the 'have-data' signal of #GstPad.
|
|
* Note that the data will have a reference count greater than 1, so it will
|
|
* be immutable -- you must not change it.
|
|
*
|
|
* For source pads, the probe will be called after the blocking function, if any
|
|
* (see gst_pad_set_blocked_async()), but before looking up the peer to chain
|
|
* to. For sink pads, the probe function will be called before configuring the
|
|
* sink with new caps, if any, and before calling the pad's chain function.
|
|
*
|
|
* Your data probe should return TRUE to let the data continue to flow, or FALSE
|
|
* to drop it. Dropping data is rarely useful, but occasionally comes in handy
|
|
* with events.
|
|
*
|
|
* Although probes are implemented internally by connecting @handler to the
|
|
* have-data signal on the pad, if you want to remove a probe it is insufficient
|
|
* to only call g_signal_handler_disconnect on the returned handler id. To
|
|
* remove a probe, use the appropriate function, such as
|
|
* gst_pad_remove_data_probe().
|
|
*
|
|
* Returns: The handler id.
|
|
*/
|
|
gulong
|
|
gst_pad_add_data_probe (GstPad * pad, GCallback handler, gpointer data)
|
|
{
|
|
gulong sigid;
|
|
gboolean was_ghost = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), 0);
|
|
g_return_val_if_fail (handler != NULL, 0);
|
|
|
|
if (GST_IS_GHOST_PAD (pad)) {
|
|
pad = gst_ghost_pad_get_target (GST_GHOST_PAD (pad));
|
|
if (!pad) {
|
|
return 0;
|
|
}
|
|
was_ghost = TRUE;
|
|
}
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
sigid = g_signal_connect (pad, "have-data", handler, data);
|
|
GST_PAD_DO_EVENT_SIGNALS (pad)++;
|
|
GST_PAD_DO_BUFFER_SIGNALS (pad)++;
|
|
GST_DEBUG ("adding data probe to pad %s:%s, now %d data, %d event probes",
|
|
GST_DEBUG_PAD_NAME (pad),
|
|
GST_PAD_DO_BUFFER_SIGNALS (pad), GST_PAD_DO_EVENT_SIGNALS (pad));
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
if (was_ghost) {
|
|
gst_object_unref (pad);
|
|
}
|
|
|
|
return sigid;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_add_event_probe:
|
|
* @pad: pad to add the event probe handler to
|
|
* @handler: function to call when data is passed over pad
|
|
* @data: data to pass along with the handler
|
|
*
|
|
* Adds a probe that will be called for all events passing through a pad. See
|
|
* gst_pad_add_data_probe() for more information.
|
|
*
|
|
* Returns: The handler id
|
|
*/
|
|
gulong
|
|
gst_pad_add_event_probe (GstPad * pad, GCallback handler, gpointer data)
|
|
{
|
|
gulong sigid;
|
|
gboolean was_ghost = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), 0);
|
|
g_return_val_if_fail (handler != NULL, 0);
|
|
|
|
if (GST_IS_GHOST_PAD (pad)) {
|
|
pad = gst_ghost_pad_get_target (GST_GHOST_PAD (pad));
|
|
if (!pad) {
|
|
return 0;
|
|
}
|
|
was_ghost = TRUE;
|
|
}
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
sigid = g_signal_connect (pad, "have-data::event", handler, data);
|
|
GST_PAD_DO_EVENT_SIGNALS (pad)++;
|
|
GST_DEBUG ("adding event probe to pad %s:%s, now %d probes",
|
|
GST_DEBUG_PAD_NAME (pad), GST_PAD_DO_EVENT_SIGNALS (pad));
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
if (was_ghost) {
|
|
gst_object_unref (pad);
|
|
}
|
|
|
|
return sigid;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_add_buffer_probe:
|
|
* @pad: pad to add the buffer probe handler to
|
|
* @handler: function to call when data is passed over pad
|
|
* @data: data to pass along with the handler
|
|
*
|
|
* Adds a probe that will be called for all buffers passing through a pad. See
|
|
* gst_pad_add_data_probe() for more information.
|
|
*
|
|
* Returns: The handler id
|
|
*/
|
|
gulong
|
|
gst_pad_add_buffer_probe (GstPad * pad, GCallback handler, gpointer data)
|
|
{
|
|
gulong sigid;
|
|
gboolean was_ghost = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), 0);
|
|
g_return_val_if_fail (handler != NULL, 0);
|
|
|
|
if (GST_IS_GHOST_PAD (pad)) {
|
|
pad = gst_ghost_pad_get_target (GST_GHOST_PAD (pad));
|
|
if (!pad) {
|
|
return 0;
|
|
}
|
|
was_ghost = TRUE;
|
|
}
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
sigid = g_signal_connect (pad, "have-data::buffer", handler, data);
|
|
GST_PAD_DO_BUFFER_SIGNALS (pad)++;
|
|
GST_DEBUG ("adding buffer probe to pad %s:%s, now %d probes",
|
|
GST_DEBUG_PAD_NAME (pad), GST_PAD_DO_BUFFER_SIGNALS (pad));
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
if (was_ghost) {
|
|
gst_object_unref (pad);
|
|
}
|
|
|
|
return sigid;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_remove_data_probe:
|
|
* @pad: pad to remove the data probe handler from
|
|
* @handler_id: handler id returned from gst_pad_add_data_probe
|
|
*
|
|
* Removes a data probe from @pad.
|
|
*/
|
|
void
|
|
gst_pad_remove_data_probe (GstPad * pad, guint handler_id)
|
|
{
|
|
gboolean was_ghost = FALSE;
|
|
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
g_return_if_fail (handler_id > 0);
|
|
|
|
if (GST_IS_GHOST_PAD (pad)) {
|
|
pad = gst_ghost_pad_get_target (GST_GHOST_PAD (pad));
|
|
if (!pad) {
|
|
return;
|
|
}
|
|
was_ghost = TRUE;
|
|
}
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
g_signal_handler_disconnect (pad, handler_id);
|
|
GST_PAD_DO_BUFFER_SIGNALS (pad)--;
|
|
GST_PAD_DO_EVENT_SIGNALS (pad)--;
|
|
GST_DEBUG
|
|
("removed data probe from pad %s:%s, now %d event, %d buffer probes",
|
|
GST_DEBUG_PAD_NAME (pad), GST_PAD_DO_EVENT_SIGNALS (pad),
|
|
GST_PAD_DO_BUFFER_SIGNALS (pad));
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
if (was_ghost) {
|
|
gst_object_unref (pad);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_remove_event_probe:
|
|
* @pad: pad to remove the event probe handler from
|
|
* @handler_id: handler id returned from gst_pad_add_event_probe
|
|
*
|
|
* Removes an event probe from @pad.
|
|
*/
|
|
void
|
|
gst_pad_remove_event_probe (GstPad * pad, guint handler_id)
|
|
{
|
|
gboolean was_ghost = FALSE;
|
|
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
g_return_if_fail (handler_id > 0);
|
|
|
|
if (GST_IS_GHOST_PAD (pad)) {
|
|
pad = gst_ghost_pad_get_target (GST_GHOST_PAD (pad));
|
|
if (!pad) {
|
|
return;
|
|
}
|
|
was_ghost = TRUE;
|
|
}
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
g_signal_handler_disconnect (pad, handler_id);
|
|
GST_PAD_DO_EVENT_SIGNALS (pad)--;
|
|
GST_DEBUG ("removed event probe from pad %s:%s, now %d event probes",
|
|
GST_DEBUG_PAD_NAME (pad), GST_PAD_DO_EVENT_SIGNALS (pad));
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
if (was_ghost) {
|
|
gst_object_unref (pad);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_remove_buffer_probe:
|
|
* @pad: pad to remove the buffer probe handler from
|
|
* @handler_id: handler id returned from gst_pad_add_buffer_probe
|
|
*
|
|
* Removes a buffer probe from @pad.
|
|
*/
|
|
void
|
|
gst_pad_remove_buffer_probe (GstPad * pad, guint handler_id)
|
|
{
|
|
gboolean was_ghost = FALSE;
|
|
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
g_return_if_fail (handler_id > 0);
|
|
|
|
if (GST_IS_GHOST_PAD (pad)) {
|
|
pad = gst_ghost_pad_get_target (GST_GHOST_PAD (pad));
|
|
if (!pad) {
|
|
return;
|
|
}
|
|
was_ghost = TRUE;
|
|
}
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
g_signal_handler_disconnect (pad, handler_id);
|
|
GST_PAD_DO_BUFFER_SIGNALS (pad)--;
|
|
GST_DEBUG ("removed buffer probe from pad %s:%s, now %d buffer probes",
|
|
GST_DEBUG_PAD_NAME (pad), GST_PAD_DO_BUFFER_SIGNALS (pad));
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
if (was_ghost) {
|
|
gst_object_unref (pad);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_found_tags_for_pad:
|
|
* @element: element for which to post taglist to bus.
|
|
* @pad: pad on which to push tag-event.
|
|
* @list: the taglist to post on the bus and create event from.
|
|
*
|
|
* Posts a message to the bus that new tags were found and pushes the
|
|
* tags as event. Takes ownership of the @list.
|
|
*
|
|
* This is a utility method for elements. Applications should use the
|
|
* #GstTagSetter interface.
|
|
*/
|
|
void
|
|
gst_element_found_tags_for_pad (GstElement * element,
|
|
GstPad * pad, GstTagList * list)
|
|
{
|
|
g_return_if_fail (element != NULL);
|
|
g_return_if_fail (pad != NULL);
|
|
g_return_if_fail (list != NULL);
|
|
|
|
gst_pad_push_event (pad, gst_event_new_tag (gst_tag_list_copy (list)));
|
|
gst_element_post_message (element,
|
|
gst_message_new_tag (GST_OBJECT (element), list));
|
|
}
|
|
|
|
static void
|
|
push_and_ref (GstPad * pad, GstEvent * event)
|
|
{
|
|
gst_pad_push_event (pad, gst_event_ref (event));
|
|
}
|
|
|
|
/**
|
|
* gst_element_found_tags:
|
|
* @element: element for which we found the tags.
|
|
* @list: list of tags.
|
|
*
|
|
* Posts a message to the bus that new tags were found, and pushes an event
|
|
* to all sourcepads. Takes ownership of the @list.
|
|
*
|
|
* This is a utility method for elements. Applications should use the
|
|
* #GstTagSetter interface.
|
|
*/
|
|
void
|
|
gst_element_found_tags (GstElement * element, GstTagList * list)
|
|
{
|
|
GstIterator *iter;
|
|
GstEvent *event;
|
|
|
|
g_return_if_fail (element != NULL);
|
|
g_return_if_fail (list != NULL);
|
|
|
|
iter = gst_element_iterate_src_pads (element);
|
|
event = gst_event_new_tag (gst_tag_list_copy (list));
|
|
gst_iterator_foreach (iter, (GFunc) push_and_ref, event);
|
|
gst_iterator_free (iter);
|
|
gst_event_unref (event);
|
|
|
|
gst_element_post_message (element,
|
|
gst_message_new_tag (GST_OBJECT (element), list));
|
|
}
|
|
|
|
static GstPad *
|
|
element_find_unconnected_pad (GstElement * element, GstPadDirection direction)
|
|
{
|
|
GstIterator *iter;
|
|
GstPad *unconnected_pad = NULL;
|
|
gboolean done;
|
|
|
|
switch (direction) {
|
|
case GST_PAD_SRC:
|
|
iter = gst_element_iterate_src_pads (element);
|
|
break;
|
|
case GST_PAD_SINK:
|
|
iter = gst_element_iterate_sink_pads (element);
|
|
break;
|
|
default:
|
|
g_assert_not_reached ();
|
|
}
|
|
|
|
done = FALSE;
|
|
while (!done) {
|
|
gpointer pad;
|
|
|
|
switch (gst_iterator_next (iter, &pad)) {
|
|
case GST_ITERATOR_OK:{
|
|
GstPad *peer;
|
|
|
|
GST_CAT_LOG (GST_CAT_ELEMENT_PADS, "examining pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
|
|
peer = gst_pad_get_peer (GST_PAD (pad));
|
|
if (peer == NULL) {
|
|
unconnected_pad = pad;
|
|
done = TRUE;
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
|
|
"found existing unlinked pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (unconnected_pad));
|
|
} else {
|
|
gst_object_unref (pad);
|
|
gst_object_unref (peer);
|
|
}
|
|
break;
|
|
}
|
|
case GST_ITERATOR_DONE:
|
|
done = TRUE;
|
|
break;
|
|
case GST_ITERATOR_RESYNC:
|
|
gst_iterator_resync (iter);
|
|
break;
|
|
case GST_ITERATOR_ERROR:
|
|
g_return_val_if_reached (NULL);
|
|
break;
|
|
}
|
|
}
|
|
|
|
gst_iterator_free (iter);
|
|
|
|
return unconnected_pad;
|
|
}
|
|
|
|
/**
|
|
* gst_bin_find_unconnected_pad:
|
|
* @bin: bin in which to look for elements with unconnected pads
|
|
* @direction: whether to look for an unconnected source or sink pad
|
|
*
|
|
* Recursively looks for elements with an unconnected pad of the given
|
|
* direction within the specified bin and returns an unconnected pad
|
|
* if one is found, or NULL otherwise. If a pad is found, the caller
|
|
* owns a reference to it and should use gst_object_unref() on the
|
|
* pad when it is not needed any longer.
|
|
*
|
|
* Returns: unconnected pad of the given direction, or NULL.
|
|
*
|
|
* Since: 0.10.3
|
|
*/
|
|
GstPad *
|
|
gst_bin_find_unconnected_pad (GstBin * bin, GstPadDirection direction)
|
|
{
|
|
GstIterator *iter;
|
|
gboolean done;
|
|
GstPad *pad = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_BIN (bin), NULL);
|
|
g_return_val_if_fail (direction != GST_PAD_UNKNOWN, NULL);
|
|
|
|
done = FALSE;
|
|
iter = gst_bin_iterate_recurse (bin);
|
|
while (!done) {
|
|
gpointer element;
|
|
|
|
switch (gst_iterator_next (iter, &element)) {
|
|
case GST_ITERATOR_OK:
|
|
pad = element_find_unconnected_pad (GST_ELEMENT (element), direction);
|
|
gst_object_unref (element);
|
|
if (pad != NULL)
|
|
done = TRUE;
|
|
break;
|
|
case GST_ITERATOR_DONE:
|
|
done = TRUE;
|
|
break;
|
|
case GST_ITERATOR_RESYNC:
|
|
gst_iterator_resync (iter);
|
|
break;
|
|
case GST_ITERATOR_ERROR:
|
|
g_return_val_if_reached (NULL);
|
|
break;
|
|
}
|
|
}
|
|
|
|
gst_iterator_free (iter);
|
|
|
|
return pad;
|
|
}
|
|
|
|
#ifndef GST_DISABLE_PARSE
|
|
/**
|
|
* gst_parse_bin_from_description:
|
|
* @bin_description: command line describing the bin
|
|
* @ghost_unconnected_pads: whether to automatically create ghost pads
|
|
* for unconnected source or sink pads within
|
|
* the bin
|
|
* @err: where to store the error message in case of an error, or NULL
|
|
*
|
|
* This is a convenience wrapper around gst_parse_launch() to create a
|
|
* #GstBin from a gst-launch-style pipeline description. See
|
|
* gst_parse_launch() and the gst-launch man page for details about the
|
|
* syntax. Ghost pads on the bin for unconnected source or sink pads
|
|
* within the bin can automatically be created (but only a maximum of
|
|
* one ghost pad for each direction will be created; if you expect
|
|
* multiple unconnected source pads or multiple unconnected sink pads
|
|
* and want them all ghosted, you will have to create the ghost pads
|
|
* yourself).
|
|
*
|
|
* Returns: a newly-created bin, or NULL if an error occurred.
|
|
*
|
|
* Since: 0.10.3
|
|
*/
|
|
GstElement *
|
|
gst_parse_bin_from_description (const gchar * bin_description,
|
|
gboolean ghost_unconnected_pads, GError ** err)
|
|
{
|
|
GstPad *pad = NULL;
|
|
GstBin *bin;
|
|
gchar *desc;
|
|
|
|
g_return_val_if_fail (bin_description != NULL, NULL);
|
|
g_return_val_if_fail (err == NULL || *err == NULL, NULL);
|
|
|
|
GST_DEBUG ("Making bin from description '%s'", bin_description);
|
|
|
|
/* parse the pipeline to a bin */
|
|
desc = g_strdup_printf ("bin.( %s )", bin_description);
|
|
bin = (GstBin *) gst_parse_launch (desc, err);
|
|
g_free (desc);
|
|
|
|
if (bin == NULL || (err && *err != NULL)) {
|
|
if (bin)
|
|
gst_object_unref (bin);
|
|
return NULL;
|
|
}
|
|
|
|
/* find pads and ghost them if necessary */
|
|
if (ghost_unconnected_pads) {
|
|
if ((pad = gst_bin_find_unconnected_pad (bin, GST_PAD_SRC))) {
|
|
gst_element_add_pad (GST_ELEMENT (bin), gst_ghost_pad_new ("src", pad));
|
|
gst_object_unref (pad);
|
|
}
|
|
if ((pad = gst_bin_find_unconnected_pad (bin, GST_PAD_SINK))) {
|
|
gst_element_add_pad (GST_ELEMENT (bin), gst_ghost_pad_new ("sink", pad));
|
|
gst_object_unref (pad);
|
|
}
|
|
}
|
|
|
|
return GST_ELEMENT (bin);
|
|
}
|
|
#endif
|