/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2000 Wim Taymans * 2002 Thomas Vander Stichele * * gstutils.c: Utility functions: gtk_get_property stuff, etc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:gstutils * @short_description: Various utility functions * * When defining own plugins, use the GST_BOILERPLATE ease gobject creation. */ #include "gst_private.h" #include #include #include "gstghostpad.h" #include "gstutils.h" #include "gstinfo.h" #include "gstparse.h" #include "gst-i18n-lib.h" /** * gst_util_dump_mem: * @mem: a pointer to the memory to dump * @size: the size of the memory block to dump * * Dumps the memory block into a hex representation. Useful for debugging. */ void gst_util_dump_mem (const guchar * mem, guint size) { guint i, j; GString *string = g_string_sized_new (50); GString *chars = g_string_sized_new (18); i = j = 0; while (i < size) { if (g_ascii_isprint (mem[i])) g_string_append_printf (chars, "%c", mem[i]); else g_string_append_printf (chars, "."); g_string_append_printf (string, "%02x ", mem[i]); j++; i++; if (j == 16 || i == size) { g_print ("%08x (%p): %-48.48s %-16.16s\n", i - j, mem + i - j, string->str, chars->str); g_string_set_size (string, 0); g_string_set_size (chars, 0); j = 0; } } g_string_free (string, TRUE); g_string_free (chars, TRUE); } /** * gst_util_set_value_from_string: * @value: the value to set * @value_str: the string to get the value from * * Converts the string to the type of the value and * sets the value with it. */ void gst_util_set_value_from_string (GValue * value, const gchar * value_str) { gint sscanf_ret; g_return_if_fail (value != NULL); g_return_if_fail (value_str != NULL); GST_CAT_DEBUG (GST_CAT_PARAMS, "parsing '%s' to type %s", value_str, g_type_name (G_VALUE_TYPE (value))); switch (G_VALUE_TYPE (value)) { case G_TYPE_STRING: g_value_set_string (value, g_strdup (value_str)); break; case G_TYPE_ENUM: case G_TYPE_INT:{ gint i; sscanf_ret = sscanf (value_str, "%d", &i); g_return_if_fail (sscanf_ret == 1); g_value_set_int (value, i); break; } case G_TYPE_UINT:{ guint i; sscanf_ret = sscanf (value_str, "%u", &i); g_return_if_fail (sscanf_ret == 1); g_value_set_uint (value, i); break; } case G_TYPE_LONG:{ glong i; sscanf_ret = sscanf (value_str, "%ld", &i); g_return_if_fail (sscanf_ret == 1); g_value_set_long (value, i); break; } case G_TYPE_ULONG:{ gulong i; sscanf_ret = sscanf (value_str, "%lu", &i); g_return_if_fail (sscanf_ret == 1); g_value_set_ulong (value, i); break; } case G_TYPE_BOOLEAN:{ gboolean i = FALSE; if (!g_ascii_strncasecmp ("true", value_str, 4)) i = TRUE; g_value_set_boolean (value, i); break; } case G_TYPE_CHAR:{ gchar i; sscanf_ret = sscanf (value_str, "%c", &i); g_return_if_fail (sscanf_ret == 1); g_value_set_char (value, i); break; } case G_TYPE_UCHAR:{ guchar i; sscanf_ret = sscanf (value_str, "%c", &i); g_return_if_fail (sscanf_ret == 1); g_value_set_uchar (value, i); break; } case G_TYPE_FLOAT:{ gfloat i; sscanf_ret = sscanf (value_str, "%f", &i); g_return_if_fail (sscanf_ret == 1); g_value_set_float (value, i); break; } case G_TYPE_DOUBLE:{ gfloat i; sscanf_ret = sscanf (value_str, "%g", &i); g_return_if_fail (sscanf_ret == 1); g_value_set_double (value, (gdouble) i); break; } default: break; } } /** * gst_util_set_object_arg: * @object: the object to set the argument of * @name: the name of the argument to set * @value: the string value to set * * Convertes the string value to the type of the objects argument and * sets the argument with it. */ void gst_util_set_object_arg (GObject * object, const gchar * name, const gchar * value) { gboolean sscanf_ret; if (name && value) { GParamSpec *paramspec; paramspec = g_object_class_find_property (G_OBJECT_GET_CLASS (object), name); if (!paramspec) { return; } GST_DEBUG ("paramspec->flags is %d, paramspec->value_type is %d", paramspec->flags, (gint) paramspec->value_type); if (paramspec->flags & G_PARAM_WRITABLE) { switch (paramspec->value_type) { case G_TYPE_STRING: g_object_set (G_OBJECT (object), name, value, NULL); break; case G_TYPE_ENUM: case G_TYPE_INT:{ gint i; sscanf_ret = sscanf (value, "%d", &i); g_return_if_fail (sscanf_ret == 1); g_object_set (G_OBJECT (object), name, i, NULL); break; } case G_TYPE_UINT:{ guint i; sscanf_ret = sscanf (value, "%u", &i); g_return_if_fail (sscanf_ret == 1); g_object_set (G_OBJECT (object), name, i, NULL); break; } case G_TYPE_LONG:{ glong i; sscanf_ret = sscanf (value, "%ld", &i); g_return_if_fail (sscanf_ret == 1); g_object_set (G_OBJECT (object), name, i, NULL); break; } case G_TYPE_ULONG:{ gulong i; sscanf_ret = sscanf (value, "%lu", &i); g_return_if_fail (sscanf_ret == 1); g_object_set (G_OBJECT (object), name, i, NULL); break; } case G_TYPE_BOOLEAN:{ gboolean i = FALSE; if (!g_ascii_strncasecmp ("true", value, 4)) i = TRUE; g_object_set (G_OBJECT (object), name, i, NULL); break; } case G_TYPE_CHAR:{ gchar i; sscanf_ret = sscanf (value, "%c", &i); g_return_if_fail (sscanf_ret == 1); g_object_set (G_OBJECT (object), name, i, NULL); break; } case G_TYPE_UCHAR:{ guchar i; sscanf_ret = sscanf (value, "%c", &i); g_return_if_fail (sscanf_ret == 1); g_object_set (G_OBJECT (object), name, i, NULL); break; } case G_TYPE_FLOAT:{ gfloat i; sscanf_ret = sscanf (value, "%f", &i); g_return_if_fail (sscanf_ret == 1); g_object_set (G_OBJECT (object), name, i, NULL); break; } case G_TYPE_DOUBLE:{ gfloat i; sscanf_ret = sscanf (value, "%g", &i); g_return_if_fail (sscanf_ret == 1); g_object_set (G_OBJECT (object), name, (gdouble) i, NULL); break; } default: if (G_IS_PARAM_SPEC_ENUM (paramspec)) { gint i; sscanf_ret = sscanf (value, "%d", &i); g_return_if_fail (sscanf_ret == 1); g_object_set (G_OBJECT (object), name, i, NULL); } break; } } } } /* work around error C2520: conversion from unsigned __int64 to double * not implemented, use signed __int64 * * These are implemented as functions because on some platforms a 64bit int to * double conversion is not defined/implemented. */ gdouble gst_util_guint64_to_gdouble (guint64 value) { if (value & G_GINT64_CONSTANT (0x8000000000000000)) return (gdouble) ((gint64) value) + (gdouble) 18446744073709551616.; else return (gdouble) ((gint64) value); } guint64 gst_util_gdouble_to_guint64 (gdouble value) { if (value < (gdouble) 9223372036854775808.) /* 1 << 63 */ return ((guint64) ((gint64) value)); value -= (gdouble) 18446744073709551616.; return ((guint64) ((gint64) value)); } /* convenience struct for getting high and low uint32 parts of * a guint64 */ typedef union { guint64 ll; struct { #if G_BYTE_ORDER == G_BIG_ENDIAN guint32 high, low; #else guint32 low, high; #endif } l; } GstUInt64; /* based on Hacker's Delight p152 */ static guint64 gst_util_div128_64 (GstUInt64 c1, GstUInt64 c0, guint64 denom) { GstUInt64 q1, q0, rhat; GstUInt64 v, cmp1, cmp2; guint s; v.ll = denom; /* count number of leading zeroes, we know they must be in the high * part of denom since denom > G_MAXUINT32. */ s = v.l.high | (v.l.high >> 1); s |= (s >> 2); s |= (s >> 4); s |= (s >> 8); s = ~(s | (s >> 16)); s = s - ((s >> 1) & 0x55555555); s = (s & 0x33333333) + ((s >> 2) & 0x33333333); s = (s + (s >> 4)) & 0x0f0f0f0f; s += (s >> 8); s = (s + (s >> 16)) & 0x3f; if (s > 0) { /* normalize divisor and dividend */ v.ll <<= s; c1.ll = (c1.ll << s) | (c0.l.high >> (32 - s)); c0.ll <<= s; } q1.ll = c1.ll / v.l.high; rhat.ll = c1.ll - q1.ll * v.l.high; cmp1.l.high = rhat.l.low; cmp1.l.low = c0.l.high; cmp2.ll = q1.ll * v.l.low; while (q1.l.high || cmp2.ll > cmp1.ll) { q1.ll--; rhat.ll += v.l.high; if (rhat.l.high) break; cmp1.l.high = rhat.l.low; cmp2.ll -= v.l.low; } c1.l.high = c1.l.low; c1.l.low = c0.l.high; c1.ll -= q1.ll * v.ll; q0.ll = c1.ll / v.l.high; rhat.ll = c1.ll - q0.ll * v.l.high; cmp1.l.high = rhat.l.low; cmp1.l.low = c0.l.low; cmp2.ll = q0.ll * v.l.low; while (q0.l.high || cmp2.ll > cmp1.ll) { q0.ll--; rhat.ll += v.l.high; if (rhat.l.high) break; cmp1.l.high = rhat.l.low; cmp2.ll -= v.l.low; } q0.l.high += q1.l.low; return q0.ll; } static guint64 gst_util_uint64_scale_int64 (guint64 val, guint64 num, guint64 denom) { GstUInt64 a0, a1, b0, b1, c0, ct, c1, result; GstUInt64 v, n; /* prepare input */ v.ll = val; n.ll = num; /* do 128 bits multiply * nh nl * * vh vl * ---------- * a0 = vl * nl * a1 = vl * nh * b0 = vh * nl * b1 = + vh * nh * ------------------- * c1,c0 */ a0.ll = (guint64) v.l.low * n.l.low; a1.ll = (guint64) v.l.low * n.l.high; b0.ll = (guint64) v.l.high * n.l.low; b1.ll = (guint64) v.l.high * n.l.high; /* and sum together with carry into 128 bits c1, c0 */ c0.l.low = a0.l.low; ct.ll = (guint64) a0.l.high + a1.l.low + b0.l.low; c0.l.high = ct.l.low; c1.ll = (guint64) a1.l.high + b0.l.high + ct.l.high + b1.ll; /* if high bits bigger than denom, we overflow */ if (c1.ll >= denom) goto overflow; /* shortcut for division by 1, c1.ll should be 0 because of the * overflow check above. */ if (denom == 1) return c0.ll; /* and 128/64 bits division, result fits 64 bits */ if (denom <= G_MAXUINT32) { guint32 den = (guint32) denom; /* easy case, (c1,c0)128/(den)32 division */ c1.l.high %= den; c1.l.high = c1.ll % den; c1.l.low = c0.l.high; c0.l.high = c1.ll % den; result.l.high = c1.ll / den; result.l.low = c0.ll / den; } else { result.ll = gst_util_div128_64 (c1, c0, denom); } 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. * * This function can potentially be very slow if denom > G_MAXUINT32. * * Returns: @val * @num / @denom, trying to avoid overflows. * In the case of an overflow, this function returns G_MAXUINT64. */ guint64 gst_util_uint64_scale (guint64 val, guint64 num, guint64 denom) { g_return_val_if_fail (denom != 0, G_MAXUINT64); 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. * In the case of an overflow, this function returns G_MAXUINT64. */ 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 (destpad) gst_object_unref (destpad); destpad = NULL; } 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); 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. * * Make sure you have added your elements to a bin or pipeline with * gst_bin_add() before trying to link them. * * 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(). * Make sure you have added your elements to a bin or pipeline with * gst_bin_add() before trying to link them. * * 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. * * Make sure you have added your elements to a bin or pipeline with * gst_bin_add() before trying to link them. * * 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_iterator_free (pads); } /** * 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_element_seek_simple * @element: a #GstElement to seek on * @format: a #GstFormat to execute the seek in, such as #GST_FORMAT_TIME * @seek_flags: seek options * @seek_pos: position to seek to (relative to the start); if you are doing * a seek in #GST_FORMAT_TIME this value is in nanoseconds - * multiply with #GST_SECOND to convert seconds to nanoseconds or * with #GST_MSECOND to convert milliseconds to nanoseconds. * * Simple API to perform a seek on the given element, meaning it just seeks * to the given position relative to the start of the stream. For more complex * operations like segment seeks (e.g. for looping) or changing the playback * rate or seeking relative to the current position or seeking relative to * the end of the stream you should use gst_element_seek (). * * Note that seeking is usually only possible in PAUSED or PLAYING state. * * Returns: TRUE if the seek operation succeeded (the seek * might not always be executed instantly though) * * Since: 0.10.7 */ gboolean gst_element_seek_simple (GstElement * element, GstFormat format, GstSeekFlags seek_flags, gint64 seek_pos) { g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE); g_return_val_if_fail (seek_pos >= 0, FALSE); return gst_element_seek (element, 1.0, format, seek_flags, GST_SEEK_TYPE_SET, seek_pos, GST_SEEK_TYPE_NONE, 0); } /** * 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; g_return_val_if_fail (GST_IS_PAD (pad), 0); g_return_val_if_fail (handler != NULL, 0); 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); 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; g_return_val_if_fail (GST_IS_PAD (pad), 0); g_return_val_if_fail (handler != NULL, 0); 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); 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; g_return_val_if_fail (GST_IS_PAD (pad), 0); g_return_val_if_fail (handler != NULL, 0); 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); 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) { g_return_if_fail (GST_IS_PAD (pad)); g_return_if_fail (handler_id > 0); 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); } /** * 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) { g_return_if_fail (GST_IS_PAD (pad)); g_return_if_fail (handler_id > 0); 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); } /** * 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) { g_return_if_fail (GST_IS_PAD (pad)); g_return_if_fail (handler_id > 0); 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); } /** * 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)); /* iterator refs pad, we unref when we are done with it */ gst_object_unref (pad); } /** * 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