| /* GStreamer |
| * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu> |
| * 2000 Wim Taymans <wtay@chello.be> |
| * 2002 Thomas Vander Stichele <thomas@apestaart.org> |
| * |
| * 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 <stdio.h> |
| #include <string.h> |
| |
| #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, 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); |
| |
| GST_OBJECT_LOCK (pad); |
| 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: |
| GST_OBJECT_UNLOCK (pad); |
| |
| 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 |