/* GStreamer * Copyright (C) <2003> David A. Schleef * * 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:gstvalue * @short_description: GValue implementations specific to GStreamer * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include "gst_private.h" #include "glib-compat.h" #include #include typedef struct _GstValueUnionInfo GstValueUnionInfo; struct _GstValueUnionInfo { GType type1; GType type2; GstValueUnionFunc func; }; typedef struct _GstValueIntersectInfo GstValueIntersectInfo; struct _GstValueIntersectInfo { GType type1; GType type2; GstValueIntersectFunc func; }; typedef struct _GstValueSubtractInfo GstValueSubtractInfo; struct _GstValueSubtractInfo { GType minuend; GType subtrahend; GstValueSubtractFunc func; }; GType gst_type_double_range; GType gst_type_list; GType gst_type_array; GType gst_type_fraction; GType gst_type_date; static GArray *gst_value_table; static GArray *gst_value_union_funcs; static GArray *gst_value_intersect_funcs; static GArray *gst_value_subtract_funcs; /******** * list * ********/ /* two helper functions to serialize/stringify any type of list * regular lists are done with { }, arrays with < > */ static char * gst_value_serialize_any_list (const GValue * value, const char *begin, const char *end) { guint i; GArray *array = value->data[0].v_pointer; GString *s; GValue *v; gchar *s_val; s = g_string_new (begin); for (i = 0; i < array->len; i++) { v = &g_array_index (array, GValue, i); s_val = gst_value_serialize (v); g_string_append (s, s_val); g_free (s_val); if (i < array->len - 1) { g_string_append (s, ", "); } } g_string_append (s, end); return g_string_free (s, FALSE); } static void gst_value_transform_any_list_string (const GValue * src_value, GValue * dest_value, const char *begin, const char *end) { GValue *list_value; GArray *array; GString *s; guint i; char *list_s; array = src_value->data[0].v_pointer; s = g_string_new (begin); for (i = 0; i < array->len; i++) { list_value = &g_array_index (array, GValue, i); if (i != 0) { g_string_append (s, ", "); } list_s = g_strdup_value_contents (list_value); g_string_append (s, list_s); g_free (list_s); } g_string_append (s, end); dest_value->data[0].v_pointer = g_string_free (s, FALSE); } /* * helper function to see if a type is fixed. Is used internally here and * there. Do not export, since it doesn't work for types where the content * decides the fixedness (e.g. GST_TYPE_ARRAY). */ static gboolean gst_type_is_fixed (GType type) { if (type == GST_TYPE_INT_RANGE || type == GST_TYPE_DOUBLE_RANGE || type == GST_TYPE_LIST) { return FALSE; } if (G_TYPE_FUNDAMENTAL (type) <= G_TYPE_MAKE_FUNDAMENTAL (G_TYPE_RESERVED_GLIB_LAST)) { return TRUE; } if (type == GST_TYPE_BUFFER || type == GST_TYPE_FOURCC || type == GST_TYPE_ARRAY || type == GST_TYPE_FRACTION) { return TRUE; } return FALSE; } /* GValue functions usable for both regular lists and arrays */ static void gst_value_init_list_or_array (GValue * value) { value->data[0].v_pointer = g_array_new (FALSE, TRUE, sizeof (GValue)); } static GArray * copy_garray_of_gstvalue (const GArray * src) { GArray *dest; guint i; dest = g_array_sized_new (FALSE, TRUE, sizeof (GValue), src->len); g_array_set_size (dest, src->len); for (i = 0; i < src->len; i++) { gst_value_init_and_copy (&g_array_index (dest, GValue, i), &g_array_index (src, GValue, i)); } return dest; } static void gst_value_copy_list_or_array (const GValue * src_value, GValue * dest_value) { dest_value->data[0].v_pointer = copy_garray_of_gstvalue ((GArray *) src_value->data[0].v_pointer); } static void gst_value_free_list_or_array (GValue * value) { guint i; GArray *src = (GArray *) value->data[0].v_pointer; if ((value->data[1].v_uint & G_VALUE_NOCOPY_CONTENTS) == 0) { for (i = 0; i < src->len; i++) { g_value_unset (&g_array_index (src, GValue, i)); } g_array_free (src, TRUE); } } static gpointer gst_value_list_or_array_peek_pointer (const GValue * value) { return value->data[0].v_pointer; } static gchar * gst_value_collect_list_or_array (GValue * value, guint n_collect_values, GTypeCValue * collect_values, guint collect_flags) { if (collect_flags & G_VALUE_NOCOPY_CONTENTS) { value->data[0].v_pointer = collect_values[0].v_pointer; value->data[1].v_uint = G_VALUE_NOCOPY_CONTENTS; } else { value->data[0].v_pointer = copy_garray_of_gstvalue ((GArray *) collect_values[0].v_pointer); } return NULL; } static gchar * gst_value_lcopy_list_or_array (const GValue * value, guint n_collect_values, GTypeCValue * collect_values, guint collect_flags) { GArray **dest = collect_values[0].v_pointer; if (!dest) return g_strdup_printf ("value location for `%s' passed as NULL", G_VALUE_TYPE_NAME (value)); if (!value->data[0].v_pointer) return g_strdup_printf ("invalid value given for `%s'", G_VALUE_TYPE_NAME (value)); if (collect_flags & G_VALUE_NOCOPY_CONTENTS) { *dest = (GArray *) value->data[0].v_pointer; } else { *dest = copy_garray_of_gstvalue ((GArray *) value->data[0].v_pointer); } return NULL; } /** * gst_value_list_append_value: * @value: a #GValue of type #GST_TYPE_LIST * @append_value: the value to append * * Appends @append_value to the GstValueList in @value. */ void gst_value_list_append_value (GValue * value, const GValue * append_value) { GValue val = { 0, }; g_return_if_fail (GST_VALUE_HOLDS_LIST (value)); gst_value_init_and_copy (&val, append_value); g_array_append_vals ((GArray *) value->data[0].v_pointer, &val, 1); } /** * gst_value_list_prepend_value: * @value: a #GValue of type #GST_TYPE_LIST * @prepend_value: the value to prepend * * Prepends @prepend_value to the GstValueList in @value. */ void gst_value_list_prepend_value (GValue * value, const GValue * prepend_value) { GValue val = { 0, }; g_return_if_fail (GST_VALUE_HOLDS_LIST (value)); gst_value_init_and_copy (&val, prepend_value); g_array_prepend_vals ((GArray *) value->data[0].v_pointer, &val, 1); } /** * gst_value_list_concat: * @dest: an uninitialized #GValue to take the result * @value1: a #GValue * @value2: a #GValue * * Concatenates copies of @value1 and @value2 into a list. Values that are not * of type #GST_TYPE_LIST are treated as if they were lists of length 1. * @dest will be initialized to the type #GST_TYPE_LIST. */ void gst_value_list_concat (GValue * dest, const GValue * value1, const GValue * value2) { guint i, value1_length, value2_length; GArray *array; g_return_if_fail (dest != NULL); g_return_if_fail (G_VALUE_TYPE (dest) == 0); g_return_if_fail (G_IS_VALUE (value1)); g_return_if_fail (G_IS_VALUE (value2)); value1_length = (GST_VALUE_HOLDS_LIST (value1) ? gst_value_list_get_size (value1) : 1); value2_length = (GST_VALUE_HOLDS_LIST (value2) ? gst_value_list_get_size (value2) : 1); g_value_init (dest, GST_TYPE_LIST); array = (GArray *) dest->data[0].v_pointer; g_array_set_size (array, value1_length + value2_length); if (GST_VALUE_HOLDS_LIST (value1)) { for (i = 0; i < value1_length; i++) { gst_value_init_and_copy (&g_array_index (array, GValue, i), gst_value_list_get_value (value1, i)); } } else { gst_value_init_and_copy (&g_array_index (array, GValue, 0), value1); } if (GST_VALUE_HOLDS_LIST (value2)) { for (i = 0; i < value2_length; i++) { gst_value_init_and_copy (&g_array_index (array, GValue, i + value1_length), gst_value_list_get_value (value2, i)); } } else { gst_value_init_and_copy (&g_array_index (array, GValue, value1_length), value2); } } /** * gst_value_list_get_size: * @value: a #GValue of type #GST_TYPE_LIST * * Gets the number of values contained in @value. * * Returns: the number of values */ guint gst_value_list_get_size (const GValue * value) { g_return_val_if_fail (GST_VALUE_HOLDS_LIST (value), 0); return ((GArray *) value->data[0].v_pointer)->len; } /** * gst_value_list_get_value: * @value: a #GValue of type #GST_TYPE_LIST * @index: index of value to get from the list * * Gets the value that is a member of the list contained in @value and * has the index @index. * * Returns: the value at the given index */ const GValue * gst_value_list_get_value (const GValue * value, guint index) { g_return_val_if_fail (GST_VALUE_HOLDS_LIST (value), NULL); g_return_val_if_fail (index < gst_value_list_get_size (value), NULL); return (const GValue *) &g_array_index ((GArray *) value->data[0].v_pointer, GValue, index); } /** * gst_value_array_append_value: * @value: a #GValue of type #GST_TYPE_ARRAY * @append_value: the value to append * * Appends @append_value to the GstValueArray in @value. */ void gst_value_array_append_value (GValue * value, const GValue * append_value) { GValue val = { 0, }; g_return_if_fail (GST_VALUE_HOLDS_ARRAY (value)); gst_value_init_and_copy (&val, append_value); g_array_append_vals ((GArray *) value->data[0].v_pointer, &val, 1); } /** * gst_value_array_prepend_value: * @value: a #GValue of type #GST_TYPE_ARRAY * @prepend_value: the value to prepend * * Prepends @prepend_value to the GstValueArray in @value. */ void gst_value_array_prepend_value (GValue * value, const GValue * prepend_value) { GValue val = { 0, }; g_return_if_fail (GST_VALUE_HOLDS_ARRAY (value)); gst_value_init_and_copy (&val, prepend_value); g_array_prepend_vals ((GArray *) value->data[0].v_pointer, &val, 1); } /** * gst_value_array_get_size: * @value: a #GValue of type #GST_TYPE_ARRAY * * Gets the number of values contained in @value. * * Returns: the number of values */ guint gst_value_array_get_size (const GValue * value) { g_return_val_if_fail (GST_VALUE_HOLDS_ARRAY (value), 0); return ((GArray *) value->data[0].v_pointer)->len; } /** * gst_value_array_get_value: * @value: a #GValue of type #GST_TYPE_ARRAY * @index: index of value to get from the array * * Gets the value that is a member of the array contained in @value and * has the index @index. * * Returns: the value at the given index */ const GValue * gst_value_array_get_value (const GValue * value, guint index) { g_return_val_if_fail (GST_VALUE_HOLDS_ARRAY (value), NULL); g_return_val_if_fail (index < gst_value_array_get_size (value), NULL); return (const GValue *) &g_array_index ((GArray *) value->data[0].v_pointer, GValue, index); } static void gst_value_transform_list_string (const GValue * src_value, GValue * dest_value) { gst_value_transform_any_list_string (src_value, dest_value, "{ ", " }"); } static void gst_value_transform_array_string (const GValue * src_value, GValue * dest_value) { gst_value_transform_any_list_string (src_value, dest_value, "< ", " >"); } static int gst_value_compare_list_or_array (const GValue * value1, const GValue * value2) { guint i, j; GArray *array1 = value1->data[0].v_pointer; GArray *array2 = value2->data[0].v_pointer; GValue *v1; GValue *v2; if (array1->len != array2->len) return GST_VALUE_UNORDERED; for (i = 0; i < array1->len; i++) { v1 = &g_array_index (array1, GValue, i); for (j = 0; j < array1->len; j++) { v2 = &g_array_index (array2, GValue, j); if (gst_value_compare (v1, v2) == GST_VALUE_EQUAL) break; } if (j == array1->len) { return GST_VALUE_UNORDERED; } } return GST_VALUE_EQUAL; } static char * gst_value_serialize_list (const GValue * value) { return gst_value_serialize_any_list (value, "{ ", " }"); } static gboolean gst_value_deserialize_list (GValue * dest, const char *s) { g_warning ("unimplemented"); return FALSE; } static char * gst_value_serialize_array (const GValue * value) { return gst_value_serialize_any_list (value, "< ", " >"); } static gboolean gst_value_deserialize_array (GValue * dest, const char *s) { g_warning ("unimplemented"); return FALSE; } /********** * fourcc * **********/ static void gst_value_init_fourcc (GValue * value) { value->data[0].v_int = 0; } static void gst_value_copy_fourcc (const GValue * src_value, GValue * dest_value) { dest_value->data[0].v_int = src_value->data[0].v_int; } static gchar * gst_value_collect_fourcc (GValue * value, guint n_collect_values, GTypeCValue * collect_values, guint collect_flags) { value->data[0].v_int = collect_values[0].v_int; return NULL; } static gchar * gst_value_lcopy_fourcc (const GValue * value, guint n_collect_values, GTypeCValue * collect_values, guint collect_flags) { guint32 *fourcc_p = collect_values[0].v_pointer; if (!fourcc_p) return g_strdup_printf ("value location for `%s' passed as NULL", G_VALUE_TYPE_NAME (value)); *fourcc_p = value->data[0].v_int; return NULL; } /** * gst_value_set_fourcc: * @value: a GValue initialized to #GST_TYPE_FOURCC * @fourcc: the #guint32 fourcc to set * * Sets @value to @fourcc. */ void gst_value_set_fourcc (GValue * value, guint32 fourcc) { g_return_if_fail (GST_VALUE_HOLDS_FOURCC (value)); value->data[0].v_int = fourcc; } /** * gst_value_get_fourcc: * @value: a GValue initialized to #GST_TYPE_FOURCC * * Gets the #guint32 fourcc contained in @value. * * Returns: the #guint32 fourcc contained in @value. */ guint32 gst_value_get_fourcc (const GValue * value) { g_return_val_if_fail (GST_VALUE_HOLDS_FOURCC (value), 0); return value->data[0].v_int; } static void gst_value_transform_fourcc_string (const GValue * src_value, GValue * dest_value) { guint32 fourcc = src_value->data[0].v_int; if (g_ascii_isprint ((fourcc >> 0) & 0xff) && g_ascii_isprint ((fourcc >> 8) & 0xff) && g_ascii_isprint ((fourcc >> 16) & 0xff) && g_ascii_isprint ((fourcc >> 24) & 0xff)) { dest_value->data[0].v_pointer = g_strdup_printf ("%" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (fourcc)); } else { dest_value->data[0].v_pointer = g_strdup_printf ("0x%08x", fourcc); } } static int gst_value_compare_fourcc (const GValue * value1, const GValue * value2) { if (value2->data[0].v_int == value1->data[0].v_int) return GST_VALUE_EQUAL; return GST_VALUE_UNORDERED; } static char * gst_value_serialize_fourcc (const GValue * value) { guint32 fourcc = value->data[0].v_int; if (g_ascii_isalnum ((fourcc >> 0) & 0xff) && g_ascii_isalnum ((fourcc >> 8) & 0xff) && g_ascii_isalnum ((fourcc >> 16) & 0xff) && g_ascii_isalnum ((fourcc >> 24) & 0xff)) { return g_strdup_printf ("%" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (fourcc)); } else { return g_strdup_printf ("0x%08x", fourcc); } } static gboolean gst_value_deserialize_fourcc (GValue * dest, const char *s) { gboolean ret = FALSE; guint32 fourcc = 0; char *end; if (strlen (s) == 4) { fourcc = GST_MAKE_FOURCC (s[0], s[1], s[2], s[3]); ret = TRUE; } else if (g_ascii_isdigit (*s)) { fourcc = strtoul (s, &end, 0); if (*end == 0) { ret = TRUE; } } gst_value_set_fourcc (dest, fourcc); return ret; } /************* * int range * *************/ static void gst_value_init_int_range (GValue * value) { value->data[0].v_int = 0; value->data[1].v_int = 0; } static void gst_value_copy_int_range (const GValue * src_value, GValue * dest_value) { dest_value->data[0].v_int = src_value->data[0].v_int; dest_value->data[1].v_int = src_value->data[1].v_int; } static gchar * gst_value_collect_int_range (GValue * value, guint n_collect_values, GTypeCValue * collect_values, guint collect_flags) { value->data[0].v_int = collect_values[0].v_int; value->data[1].v_int = collect_values[1].v_int; return NULL; } static gchar * gst_value_lcopy_int_range (const GValue * value, guint n_collect_values, GTypeCValue * collect_values, guint collect_flags) { guint32 *int_range_start = collect_values[0].v_pointer; guint32 *int_range_end = collect_values[1].v_pointer; if (!int_range_start) return g_strdup_printf ("start value location for `%s' passed as NULL", G_VALUE_TYPE_NAME (value)); if (!int_range_end) return g_strdup_printf ("end value location for `%s' passed as NULL", G_VALUE_TYPE_NAME (value)); *int_range_start = value->data[0].v_int; *int_range_end = value->data[1].v_int; return NULL; } /** * gst_value_set_int_range: * @value: a GValue initialized to GST_TYPE_INT_RANGE * @start: the start of the range * @end: the end of the range * * Sets @value to the range specified by @start and @end. */ void gst_value_set_int_range (GValue * value, int start, int end) { g_return_if_fail (GST_VALUE_HOLDS_INT_RANGE (value)); g_return_if_fail (start < end); value->data[0].v_int = start; value->data[1].v_int = end; } /** * gst_value_get_int_range_min: * @value: a GValue initialized to GST_TYPE_INT_RANGE * * Gets the minimum of the range specified by @value. * * Returns: the minimum of the range */ int gst_value_get_int_range_min (const GValue * value) { g_return_val_if_fail (GST_VALUE_HOLDS_INT_RANGE (value), 0); return value->data[0].v_int; } /** * gst_value_get_int_range_max: * @value: a GValue initialized to GST_TYPE_INT_RANGE * * Gets the maximum of the range specified by @value. * * Returns: the maxumum of the range */ int gst_value_get_int_range_max (const GValue * value) { g_return_val_if_fail (GST_VALUE_HOLDS_INT_RANGE (value), 0); return value->data[1].v_int; } static void gst_value_transform_int_range_string (const GValue * src_value, GValue * dest_value) { dest_value->data[0].v_pointer = g_strdup_printf ("[%d,%d]", (int) src_value->data[0].v_int, (int) src_value->data[1].v_int); } static int gst_value_compare_int_range (const GValue * value1, const GValue * value2) { if (value2->data[0].v_int == value1->data[0].v_int && value2->data[1].v_int == value1->data[1].v_int) return GST_VALUE_EQUAL; return GST_VALUE_UNORDERED; } static char * gst_value_serialize_int_range (const GValue * value) { return g_strdup_printf ("[ %d, %d ]", value->data[0].v_int, value->data[1].v_int); } static gboolean gst_value_deserialize_int_range (GValue * dest, const char *s) { g_warning ("unimplemented"); return FALSE; } /**************** * double range * ****************/ static void gst_value_init_double_range (GValue * value) { value->data[0].v_double = 0; value->data[1].v_double = 0; } static void gst_value_copy_double_range (const GValue * src_value, GValue * dest_value) { dest_value->data[0].v_double = src_value->data[0].v_double; dest_value->data[1].v_double = src_value->data[1].v_double; } static gchar * gst_value_collect_double_range (GValue * value, guint n_collect_values, GTypeCValue * collect_values, guint collect_flags) { value->data[0].v_double = collect_values[0].v_double; value->data[1].v_double = collect_values[1].v_double; return NULL; } static gchar * gst_value_lcopy_double_range (const GValue * value, guint n_collect_values, GTypeCValue * collect_values, guint collect_flags) { gdouble *double_range_start = collect_values[0].v_pointer; gdouble *double_range_end = collect_values[1].v_pointer; if (!double_range_start) return g_strdup_printf ("start value location for `%s' passed as NULL", G_VALUE_TYPE_NAME (value)); if (!double_range_end) return g_strdup_printf ("end value location for `%s' passed as NULL", G_VALUE_TYPE_NAME (value)); *double_range_start = value->data[0].v_double; *double_range_end = value->data[1].v_double; return NULL; } /** * gst_value_set_double_range: * @value: a GValue initialized to GST_TYPE_DOUBLE_RANGE * @start: the start of the range * @end: the end of the range * * Sets @value to the range specified by @start and @end. */ void gst_value_set_double_range (GValue * value, double start, double end) { g_return_if_fail (GST_VALUE_HOLDS_DOUBLE_RANGE (value)); value->data[0].v_double = start; value->data[1].v_double = end; } /** * gst_value_get_double_range_min: * @value: a GValue initialized to GST_TYPE_DOUBLE_RANGE * * Gets the minimum of the range specified by @value. * * Returns: the minumum of the range */ double gst_value_get_double_range_min (const GValue * value) { g_return_val_if_fail (GST_VALUE_HOLDS_DOUBLE_RANGE (value), 0); return value->data[0].v_double; } /** * gst_value_get_double_range_max: * @value: a GValue initialized to GST_TYPE_DOUBLE_RANGE * * Gets the maximum of the range specified by @value. * * Returns: the maxumum of the range */ double gst_value_get_double_range_max (const GValue * value) { g_return_val_if_fail (GST_VALUE_HOLDS_DOUBLE_RANGE (value), 0); return value->data[1].v_double; } static void gst_value_transform_double_range_string (const GValue * src_value, GValue * dest_value) { char s1[G_ASCII_DTOSTR_BUF_SIZE], s2[G_ASCII_DTOSTR_BUF_SIZE]; dest_value->data[0].v_pointer = g_strdup_printf ("[%s,%s]", g_ascii_dtostr (s1, G_ASCII_DTOSTR_BUF_SIZE, src_value->data[0].v_double), g_ascii_dtostr (s2, G_ASCII_DTOSTR_BUF_SIZE, src_value->data[1].v_double)); } static int gst_value_compare_double_range (const GValue * value1, const GValue * value2) { if (value2->data[0].v_double == value1->data[0].v_double && value2->data[0].v_double == value1->data[0].v_double) return GST_VALUE_EQUAL; return GST_VALUE_UNORDERED; } static char * gst_value_serialize_double_range (const GValue * value) { char d1[G_ASCII_DTOSTR_BUF_SIZE]; char d2[G_ASCII_DTOSTR_BUF_SIZE]; g_ascii_dtostr (d1, G_ASCII_DTOSTR_BUF_SIZE, value->data[0].v_double); g_ascii_dtostr (d2, G_ASCII_DTOSTR_BUF_SIZE, value->data[1].v_double); return g_strdup_printf ("[ %s, %s ]", d1, d2); } static gboolean gst_value_deserialize_double_range (GValue * dest, const char *s) { g_warning ("unimplemented"); return FALSE; } /*********** * GstCaps * ***********/ /** * gst_value_set_caps: * @value: a GValue initialized to GST_TYPE_CAPS * @caps: the caps to set the value to * * Sets the contents of @value to coorespond to @caps. The actual * #GstCaps structure is copied before it is used. */ void gst_value_set_caps (GValue * value, const GstCaps * caps) { g_return_if_fail (G_VALUE_TYPE (value) == GST_TYPE_CAPS); g_value_set_boxed (value, caps); } /** * gst_value_get_caps: * @value: a GValue initialized to GST_TYPE_CAPS * * Gets the contents of @value. * * Returns: the contents of @value */ const GstCaps * gst_value_get_caps (const GValue * value) { g_return_val_if_fail (G_VALUE_TYPE (value) == GST_TYPE_CAPS, NULL); return (GstCaps *) g_value_get_boxed (value); } static char * gst_value_serialize_caps (const GValue * value) { GstCaps *caps = g_value_get_boxed (value); return gst_caps_to_string (caps); } static gboolean gst_value_deserialize_caps (GValue * dest, const char *s) { GstCaps *caps; caps = gst_caps_from_string (s); if (caps) { g_value_set_boxed (dest, caps); return TRUE; } return FALSE; } /************* * GstBuffer * *************/ static int gst_value_compare_buffer (const GValue * value1, const GValue * value2) { GstBuffer *buf1 = GST_BUFFER (gst_value_get_mini_object (value1)); GstBuffer *buf2 = GST_BUFFER (gst_value_get_mini_object (value2)); if (GST_BUFFER_SIZE (buf1) != GST_BUFFER_SIZE (buf2)) return GST_VALUE_UNORDERED; if (GST_BUFFER_SIZE (buf1) == 0) return GST_VALUE_EQUAL; g_assert (GST_BUFFER_DATA (buf1)); g_assert (GST_BUFFER_DATA (buf2)); if (memcmp (GST_BUFFER_DATA (buf1), GST_BUFFER_DATA (buf2), GST_BUFFER_SIZE (buf1)) == 0) return GST_VALUE_EQUAL; return GST_VALUE_UNORDERED; } static char * gst_value_serialize_buffer (const GValue * value) { guint8 *data; int i; int size; char *string; GstBuffer *buffer = GST_BUFFER (gst_value_get_mini_object (value)); data = GST_BUFFER_DATA (buffer); size = GST_BUFFER_SIZE (buffer); string = g_malloc (size * 2 + 1); for (i = 0; i < size; i++) { sprintf (string + i * 2, "%02x", data[i]); } string[size * 2] = 0; return string; } static gboolean gst_value_deserialize_buffer (GValue * dest, const char *s) { GstBuffer *buffer; gboolean ret = TRUE; int len; char ts[3]; guint8 *data; int i; len = strlen (s); if (len & 1) return FALSE; buffer = gst_buffer_new_and_alloc (len / 2); data = GST_BUFFER_DATA (buffer); for (i = 0; i < len / 2; i++) { if (!isxdigit ((int) s[i * 2]) || !isxdigit ((int) s[i * 2 + 1])) { ret = FALSE; break; } ts[0] = s[i * 2 + 0]; ts[1] = s[i * 2 + 1]; ts[2] = 0; data[i] = strtoul (ts, NULL, 16); } if (ret) { gst_value_take_mini_object (dest, GST_MINI_OBJECT (buffer)); return TRUE; } else { gst_buffer_unref (buffer); return FALSE; } } /*********** * boolean * ***********/ static int gst_value_compare_boolean (const GValue * value1, const GValue * value2) { if ((value1->data[0].v_int != 0) == (value2->data[0].v_int != 0)) return GST_VALUE_EQUAL; return GST_VALUE_UNORDERED; } static char * gst_value_serialize_boolean (const GValue * value) { if (value->data[0].v_int) { return g_strdup ("true"); } return g_strdup ("false"); } static gboolean gst_value_deserialize_boolean (GValue * dest, const char *s) { gboolean ret = FALSE; if (g_ascii_strcasecmp (s, "true") == 0 || g_ascii_strcasecmp (s, "yes") == 0 || g_ascii_strcasecmp (s, "t") == 0 || strcmp (s, "1") == 0) { g_value_set_boolean (dest, TRUE); ret = TRUE; } else if (g_ascii_strcasecmp (s, "false") == 0 || g_ascii_strcasecmp (s, "no") == 0 || g_ascii_strcasecmp (s, "f") == 0 || strcmp (s, "0") == 0) { g_value_set_boolean (dest, FALSE); ret = TRUE; } return ret; } #define CREATE_SERIALIZATION_START(_type,_macro) \ static gint \ gst_value_compare_ ## _type \ (const GValue * value1, const GValue * value2) \ { \ g ## _type val1 = g_value_get_ ## _type (value1); \ g ## _type val2 = g_value_get_ ## _type (value2); \ if (val1 > val2) \ return GST_VALUE_GREATER_THAN; \ if (val1 < val2) \ return GST_VALUE_LESS_THAN; \ return GST_VALUE_EQUAL; \ } \ \ static char * \ gst_value_serialize_ ## _type (const GValue * value) \ { \ GValue val = { 0, }; \ g_value_init (&val, G_TYPE_STRING); \ if (!g_value_transform (value, &val)) \ g_assert_not_reached (); \ /* NO_COPY_MADNESS!!! */ \ return (char *) g_value_get_string (&val); \ } /* deserialize the given s into to as a gint64. * check if the result is actually storeable in the given size number of * bytes. */ static gboolean gst_value_deserialize_int_helper (gint64 * to, const char *s, gint64 min, gint64 max, int size) { gboolean ret = FALSE; char *end; gint64 mask = -1; errno = 0; *to = g_ascii_strtoull (s, &end, 0); /* a range error is a definitive no-no */ if (errno == ERANGE) { return FALSE; } if (*end == 0) { ret = TRUE; } else { if (g_ascii_strcasecmp (s, "little_endian") == 0) { *to = G_LITTLE_ENDIAN; ret = TRUE; } else if (g_ascii_strcasecmp (s, "big_endian") == 0) { *to = G_BIG_ENDIAN; ret = TRUE; } else if (g_ascii_strcasecmp (s, "byte_order") == 0) { *to = G_BYTE_ORDER; ret = TRUE; } else if (g_ascii_strcasecmp (s, "min") == 0) { *to = min; ret = TRUE; } else if (g_ascii_strcasecmp (s, "max") == 0) { *to = max; ret = TRUE; } } if (ret) { /* by definition, a gint64 fits into a gint64; so ignore those */ if (size != sizeof (mask)) { if (*to >= 0) { /* for positive numbers, we create a mask of 1's outside of the range * and 0's inside the range. An and will thus keep only 1 bits * outside of the range */ mask <<= (size * 8); if ((mask & *to) != 0) { ret = FALSE; } } else { /* for negative numbers, we do a 2's complement version */ mask <<= ((size * 8) - 1); if ((mask & *to) != mask) { ret = FALSE; } } } } return ret; } #define CREATE_SERIALIZATION(_type,_macro) \ CREATE_SERIALIZATION_START(_type,_macro) \ \ static gboolean \ gst_value_deserialize_ ## _type (GValue * dest, const char *s) \ { \ gint64 x; \ \ if (gst_value_deserialize_int_helper (&x, s, G_MIN ## _macro, \ G_MAX ## _macro, sizeof (g ## _type))) { \ g_value_set_ ## _type (dest, /*(g ## _type)*/ x); \ return TRUE; \ } else { \ return FALSE; \ } \ } #define CREATE_USERIALIZATION(_type,_macro) \ CREATE_SERIALIZATION_START(_type,_macro) \ \ static gboolean \ gst_value_deserialize_ ## _type (GValue * dest, const char *s) \ { \ gint64 x; \ char *end; \ gboolean ret = FALSE; \ \ errno = 0; \ x = g_ascii_strtoull (s, &end, 0); \ /* a range error is a definitive no-no */ \ if (errno == ERANGE) { \ return FALSE; \ } \ /* the cast ensures the range check later on makes sense */ \ x = (g ## _type) x; \ if (*end == 0) { \ ret = TRUE; \ } else { \ if (g_ascii_strcasecmp (s, "little_endian") == 0) { \ x = G_LITTLE_ENDIAN; \ ret = TRUE; \ } else if (g_ascii_strcasecmp (s, "big_endian") == 0) { \ x = G_BIG_ENDIAN; \ ret = TRUE; \ } else if (g_ascii_strcasecmp (s, "byte_order") == 0) { \ x = G_BYTE_ORDER; \ ret = TRUE; \ } else if (g_ascii_strcasecmp (s, "min") == 0) { \ x = 0; \ ret = TRUE; \ } else if (g_ascii_strcasecmp (s, "max") == 0) { \ x = G_MAX ## _macro; \ ret = TRUE; \ } \ } \ if (ret) { \ if (x > G_MAX ## _macro) { \ ret = FALSE; \ } else { \ g_value_set_ ## _type (dest, x); \ } \ } \ return ret; \ } #define REGISTER_SERIALIZATION(_gtype, _type) \ G_STMT_START { \ static const GstValueTable gst_value = { \ _gtype, \ gst_value_compare_ ## _type, \ gst_value_serialize_ ## _type, \ gst_value_deserialize_ ## _type, \ }; \ \ gst_value_register (&gst_value); \ } G_STMT_END CREATE_SERIALIZATION (int, INT); CREATE_SERIALIZATION (int64, INT64); CREATE_SERIALIZATION (long, LONG); CREATE_USERIALIZATION (uint, UINT); CREATE_USERIALIZATION (uint64, UINT64); CREATE_USERIALIZATION (ulong, ULONG); /********** * double * **********/ static int gst_value_compare_double (const GValue * value1, const GValue * value2) { if (value1->data[0].v_double > value2->data[0].v_double) return GST_VALUE_GREATER_THAN; if (value1->data[0].v_double < value2->data[0].v_double) return GST_VALUE_LESS_THAN; if (value1->data[0].v_double == value2->data[0].v_double) return GST_VALUE_EQUAL; return GST_VALUE_UNORDERED; } static char * gst_value_serialize_double (const GValue * value) { char d[G_ASCII_DTOSTR_BUF_SIZE]; g_ascii_dtostr (d, G_ASCII_DTOSTR_BUF_SIZE, value->data[0].v_double); return g_strdup (d); } static gboolean gst_value_deserialize_double (GValue * dest, const char *s) { double x; gboolean ret = FALSE; char *end; x = g_ascii_strtod (s, &end); if (*end == 0) { ret = TRUE; } else { if (g_ascii_strcasecmp (s, "min") == 0) { x = -G_MAXDOUBLE; ret = TRUE; } else if (g_ascii_strcasecmp (s, "max") == 0) { x = G_MAXDOUBLE; ret = TRUE; } } if (ret) { g_value_set_double (dest, x); } return ret; } /********* * float * *********/ static int gst_value_compare_float (const GValue * value1, const GValue * value2) { if (value1->data[0].v_float > value2->data[0].v_float) return GST_VALUE_GREATER_THAN; if (value1->data[0].v_float < value2->data[0].v_float) return GST_VALUE_LESS_THAN; if (value1->data[0].v_float == value2->data[0].v_float) return GST_VALUE_EQUAL; return GST_VALUE_UNORDERED; } static char * gst_value_serialize_float (const GValue * value) { char d[G_ASCII_DTOSTR_BUF_SIZE]; g_ascii_dtostr (d, G_ASCII_DTOSTR_BUF_SIZE, value->data[0].v_float); return g_strdup (d); } static gboolean gst_value_deserialize_float (GValue * dest, const char *s) { double x; gboolean ret = FALSE; char *end; x = g_ascii_strtod (s, &end); if (*end == 0) { ret = TRUE; } else { if (g_ascii_strcasecmp (s, "min") == 0) { x = -G_MAXFLOAT; ret = TRUE; } else if (g_ascii_strcasecmp (s, "max") == 0) { x = G_MAXFLOAT; ret = TRUE; } } if (x > G_MAXFLOAT || x < -G_MAXFLOAT) ret = FALSE; if (ret) { g_value_set_float (dest, x); } return ret; } /********** * string * **********/ static int gst_value_compare_string (const GValue * value1, const GValue * value2) { int x = strcmp (value1->data[0].v_pointer, value2->data[0].v_pointer); if (x < 0) return GST_VALUE_LESS_THAN; if (x > 0) return GST_VALUE_GREATER_THAN; return GST_VALUE_EQUAL; } #define GST_ASCII_IS_STRING(c) (g_ascii_isalnum((c)) || ((c) == '_') || \ ((c) == '-') || ((c) == '+') || ((c) == '/') || ((c) == ':') || \ ((c) == '.')) static gchar * gst_string_wrap (const char *s) { const gchar *t; int len; gchar *d, *e; gboolean wrap = FALSE; len = 0; t = s; if (!s) return NULL; while (*t) { if (GST_ASCII_IS_STRING (*t)) { len++; } else if (*t < 0x20 || *t >= 0x7f) { wrap = TRUE; len += 4; } else { wrap = TRUE; len += 2; } t++; } if (!wrap) return g_strdup (s); e = d = g_malloc (len + 3); *e++ = '\"'; t = s; while (*t) { if (GST_ASCII_IS_STRING (*t)) { *e++ = *t++; } else if (*t < 0x20 || *t >= 0x7f) { *e++ = '\\'; *e++ = '0' + ((*(guchar *) t) >> 6); *e++ = '0' + (((*t) >> 3) & 0x7); *e++ = '0' + ((*t++) & 0x7); } else { *e++ = '\\'; *e++ = *t++; } } *e++ = '\"'; *e = 0; return d; } /* * This function takes a string delimited with double quotes (") * and unescapes any \xxx octal numbers. * * If sequences of \y are found where y is not in the range of * 0->3, y is copied unescaped. * * If \xyy is found where x is an octal number but y is not, an * error is encountered and NULL is returned. * * the input string must be \0 terminated. */ static char * gst_string_unwrap (const gchar * s) { gchar *ret; gchar *read, *write; /* NULL string returns NULL */ if (s == NULL) return NULL; /* strings not starting with " are invalid */ if (*s != '"') return NULL; /* make copy of original string to hold the result. This * string will always be smaller than the original */ ret = g_strdup (s); read = ret; write = ret; /* need to move to the next position as we parsed the " */ read++; while (*read) { if (GST_ASCII_IS_STRING (*read)) { /* normal chars are just copied */ *write++ = *read++; } else if (*read == '"') { /* quote marks end of string */ break; } else if (*read == '\\') { /* got an escape char, move to next position to read a tripplet * of octal numbers */ read++; /* is the next char a possible first octal number? */ if (*read >= '0' && *read <= '3') { /* parse other 2 numbers, if one of them is not in the range of * an octal number, we error. We also catch the case where a zero * byte is found here. */ if (read[1] < '0' || read[1] > '7' || read[2] < '0' || read[2] > '7') goto beach; /* now convert the octal number to a byte again. */ *write++ = ((read[0] - '0') << 6) + ((read[1] - '0') << 3) + (read[2] - '0'); read += 3; } else { /* if we run into a \0 here, we definately won't get a quote later */ if (*read == 0) goto beach; /* else copy \X sequence */ *write++ = *read++; } } else { /* weird character, error */ goto beach; } } /* if the string is not ending in " and zero terminated, we error */ if (*read != '"' || read[1] != '\0') goto beach; /* null terminate result string and return */ *write++ = '\0'; return ret; beach: g_free (ret); return NULL; } static char * gst_value_serialize_string (const GValue * value) { return gst_string_wrap (value->data[0].v_pointer); } static gboolean gst_value_deserialize_string (GValue * dest, const char *s) { if (*s != '"') { if (!g_utf8_validate (s, -1, NULL)) return FALSE; g_value_set_string (dest, s); return TRUE; } else { gchar *str = gst_string_unwrap (s); if (!str) return FALSE; g_value_take_string (dest, str); } return TRUE; } /******** * enum * ********/ static int gst_value_compare_enum (const GValue * value1, const GValue * value2) { GEnumValue *en1, *en2; GEnumClass *klass1 = (GEnumClass *) g_type_class_ref (G_VALUE_TYPE (value1)); GEnumClass *klass2 = (GEnumClass *) g_type_class_ref (G_VALUE_TYPE (value2)); g_return_val_if_fail (klass1, GST_VALUE_UNORDERED); g_return_val_if_fail (klass2, GST_VALUE_UNORDERED); en1 = g_enum_get_value (klass1, g_value_get_enum (value1)); en2 = g_enum_get_value (klass2, g_value_get_enum (value2)); g_type_class_unref (klass1); g_type_class_unref (klass2); g_return_val_if_fail (en1, GST_VALUE_UNORDERED); g_return_val_if_fail (en2, GST_VALUE_UNORDERED); if (en1->value < en2->value) return GST_VALUE_LESS_THAN; if (en1->value > en2->value) return GST_VALUE_GREATER_THAN; return GST_VALUE_EQUAL; } static char * gst_value_serialize_enum (const GValue * value) { GEnumValue *en; GEnumClass *klass = (GEnumClass *) g_type_class_ref (G_VALUE_TYPE (value)); g_return_val_if_fail (klass, NULL); en = g_enum_get_value (klass, g_value_get_enum (value)); g_type_class_unref (klass); g_return_val_if_fail (en, NULL); return g_strdup (en->value_name); } static gboolean gst_value_deserialize_enum (GValue * dest, const char *s) { GEnumValue *en; gchar *endptr = NULL; GEnumClass *klass = (GEnumClass *) g_type_class_ref (G_VALUE_TYPE (dest)); g_return_val_if_fail (klass, FALSE); if (!(en = g_enum_get_value_by_name (klass, s))) { if (!(en = g_enum_get_value_by_nick (klass, s))) { gint i = strtol (s, &endptr, 0); if (endptr && *endptr == '\0') { en = g_enum_get_value (klass, i); } } } g_type_class_unref (klass); g_return_val_if_fail (en, FALSE); g_value_set_enum (dest, en->value); return TRUE; } /******** * flags * ********/ /* we just compare the value here */ static int gst_value_compare_flags (const GValue * value1, const GValue * value2) { guint fl1, fl2; GFlagsClass *klass1 = (GFlagsClass *) g_type_class_ref (G_VALUE_TYPE (value1)); GFlagsClass *klass2 = (GFlagsClass *) g_type_class_ref (G_VALUE_TYPE (value2)); g_return_val_if_fail (klass1, GST_VALUE_UNORDERED); g_return_val_if_fail (klass2, GST_VALUE_UNORDERED); fl1 = g_value_get_flags (value1); fl2 = g_value_get_flags (value2); g_type_class_unref (klass1); g_type_class_unref (klass2); if (fl1 < fl2) return GST_VALUE_LESS_THAN; if (fl1 > fl2) return GST_VALUE_GREATER_THAN; return GST_VALUE_EQUAL; } /* the different flags are serialized separated with a + */ static char * gst_value_serialize_flags (const GValue * value) { guint flags; GFlagsValue *fl; GFlagsClass *klass = (GFlagsClass *) g_type_class_ref (G_VALUE_TYPE (value)); gchar *result, *tmp; gboolean first = TRUE; g_return_val_if_fail (klass, NULL); result = g_strdup (""); flags = g_value_get_flags (value); while (flags) { fl = gst_flags_get_first_value (klass, flags); if (fl != NULL) { tmp = g_strconcat (result, (first ? "" : "+"), fl->value_name, NULL); g_free (result); result = tmp; first = FALSE; } /* clear flag */ flags &= ~fl->value; } g_type_class_unref (klass); return result; } static gboolean gst_value_deserialize_flags (GValue * dest, const char *s) { GFlagsValue *fl; gchar *endptr = NULL; GFlagsClass *klass = (GFlagsClass *) g_type_class_ref (G_VALUE_TYPE (dest)); gchar **split; guint flags; gint i; g_return_val_if_fail (klass, FALSE); /* split into parts delimited with + */ split = g_strsplit (s, "+", 0); flags = 0; i = 0; /* loop over each part */ while (split[i]) { if (!(fl = g_flags_get_value_by_name (klass, split[i]))) { if (!(fl = g_flags_get_value_by_nick (klass, split[i]))) { gint val = strtol (split[i], &endptr, 0); /* just or numeric value */ if (endptr && *endptr == '\0') { flags |= val; } } } if (fl) { flags |= fl->value; } i++; } g_strfreev (split); g_type_class_unref (klass); g_value_set_flags (dest, flags); return TRUE; } /********* * union * *********/ static gboolean gst_value_union_int_int_range (GValue * dest, const GValue * src1, const GValue * src2) { if (src2->data[0].v_int <= src1->data[0].v_int && src2->data[1].v_int >= src1->data[0].v_int) { gst_value_init_and_copy (dest, src2); return TRUE; } return FALSE; } static gboolean gst_value_union_int_range_int_range (GValue * dest, const GValue * src1, const GValue * src2) { int min; int max; min = MAX (src1->data[0].v_int, src2->data[0].v_int); max = MIN (src1->data[1].v_int, src2->data[1].v_int); if (min <= max) { g_value_init (dest, GST_TYPE_INT_RANGE); gst_value_set_int_range (dest, MIN (src1->data[0].v_int, src2->data[0].v_int), MAX (src1->data[1].v_int, src2->data[1].v_int)); return TRUE; } return FALSE; } /**************** * intersection * ****************/ static gboolean gst_value_intersect_int_int_range (GValue * dest, const GValue * src1, const GValue * src2) { if (src2->data[0].v_int <= src1->data[0].v_int && src2->data[1].v_int >= src1->data[0].v_int) { gst_value_init_and_copy (dest, src1); return TRUE; } return FALSE; } static gboolean gst_value_intersect_int_range_int_range (GValue * dest, const GValue * src1, const GValue * src2) { int min; int max; min = MAX (src1->data[0].v_int, src2->data[0].v_int); max = MIN (src1->data[1].v_int, src2->data[1].v_int); if (min < max) { g_value_init (dest, GST_TYPE_INT_RANGE); gst_value_set_int_range (dest, min, max); return TRUE; } if (min == max) { g_value_init (dest, G_TYPE_INT); g_value_set_int (dest, min); return TRUE; } return FALSE; } static gboolean gst_value_intersect_double_double_range (GValue * dest, const GValue * src1, const GValue * src2) { if (src2->data[0].v_double <= src1->data[0].v_double && src2->data[1].v_double >= src1->data[0].v_double) { gst_value_init_and_copy (dest, src1); return TRUE; } return FALSE; } static gboolean gst_value_intersect_double_range_double_range (GValue * dest, const GValue * src1, const GValue * src2) { double min; double max; min = MAX (src1->data[0].v_double, src2->data[0].v_double); max = MIN (src1->data[1].v_double, src2->data[1].v_double); if (min < max) { g_value_init (dest, GST_TYPE_DOUBLE_RANGE); gst_value_set_double_range (dest, min, max); return TRUE; } if (min == max) { g_value_init (dest, G_TYPE_DOUBLE); g_value_set_int (dest, min); return TRUE; } return FALSE; } static gboolean gst_value_intersect_list (GValue * dest, const GValue * value1, const GValue * value2) { guint i, size; GValue intersection = { 0, }; gboolean ret = FALSE; size = gst_value_list_get_size (value1); for (i = 0; i < size; i++) { const GValue *cur = gst_value_list_get_value (value1, i); if (gst_value_intersect (&intersection, cur, value2)) { /* append value */ if (!ret) { gst_value_init_and_copy (dest, &intersection); ret = TRUE; } else if (GST_VALUE_HOLDS_LIST (dest)) { gst_value_list_append_value (dest, &intersection); } else { GValue temp = { 0, }; gst_value_init_and_copy (&temp, dest); g_value_unset (dest); gst_value_list_concat (dest, &temp, &intersection); g_value_unset (&temp); } g_value_unset (&intersection); } } return ret; } static gboolean gst_value_intersect_array (GValue * dest, const GValue * src1, const GValue * src2) { guint size; guint n; GValue val = { 0 }; /* only works on similar-sized arrays */ size = gst_value_list_get_size (src1); if (size != gst_value_list_get_size (src2)) return FALSE; g_value_init (dest, GST_TYPE_ARRAY); for (n = 0; n < size; n++) { if (!gst_value_intersect (&val, gst_value_list_get_value (src1, n), gst_value_list_get_value (src2, n))) { g_value_unset (dest); return FALSE; } gst_value_list_append_value (dest, &val); g_value_unset (&val); } return TRUE; } /*************** * subtraction * ***************/ static gboolean gst_value_subtract_int_int_range (GValue * dest, const GValue * minuend, const GValue * subtrahend) { int min = gst_value_get_int_range_min (subtrahend); int max = gst_value_get_int_range_max (subtrahend); int val = g_value_get_int (minuend); /* subtracting a range from an int only works if the int is not in the * range */ if (val < min || val > max) { /* and the result is the int */ gst_value_init_and_copy (dest, minuend); return TRUE; } return FALSE; } /* creates a new int range based on input values. */ static gboolean gst_value_create_new_range (GValue * dest, int min1, int max1, int min2, int max2) { GValue v1 = { 0, }; GValue v2 = { 0, }; GValue *pv1, *pv2; /* yeah, hungarian! */ if (min1 <= max1 && min2 <= max2) { pv1 = &v1; pv2 = &v2; } else if (min1 <= max1) { pv1 = dest; pv2 = NULL; } else if (min2 <= max2) { pv1 = NULL; pv2 = dest; } else { return FALSE; } if (min1 < max1) { g_value_init (pv1, GST_TYPE_INT_RANGE); gst_value_set_int_range (pv1, min1, max1); } else if (min1 == max1) { g_value_init (pv1, G_TYPE_INT); g_value_set_int (pv1, min1); } if (min2 < max2) { g_value_init (pv2, GST_TYPE_INT_RANGE); gst_value_set_int_range (pv2, min2, max2); } else if (min2 == max2) { g_value_init (pv2, G_TYPE_INT); g_value_set_int (pv2, min2); } if (min1 <= max1 && min2 <= max2) { gst_value_list_concat (dest, pv1, pv2); g_value_unset (pv1); g_value_unset (pv2); } return TRUE; } static gboolean gst_value_subtract_int_range_int (GValue * dest, const GValue * minuend, const GValue * subtrahend) { int min = gst_value_get_int_range_min (minuend); int max = gst_value_get_int_range_max (minuend); int val = g_value_get_int (subtrahend); g_return_val_if_fail (min < max, FALSE); /* value is outside of the range, return range unchanged */ if (val < min || val > max) { gst_value_init_and_copy (dest, minuend); return TRUE; } else { /* max must be MAXINT too as val <= max */ if (val == G_MAXINT) { max--; val--; } /* min must be MININT too as val >= max */ if (val == G_MININT) { min++; val++; } gst_value_create_new_range (dest, min, val - 1, val + 1, max); } return TRUE; } static gboolean gst_value_subtract_int_range_int_range (GValue * dest, const GValue * minuend, const GValue * subtrahend) { int min1 = gst_value_get_int_range_min (minuend); int max1 = gst_value_get_int_range_max (minuend); int min2 = gst_value_get_int_range_min (subtrahend); int max2 = gst_value_get_int_range_max (subtrahend); if (max2 == G_MAXINT && min2 == G_MININT) { return FALSE; } else if (max2 == G_MAXINT) { return gst_value_create_new_range (dest, min1, MIN (min2 - 1, max1), 1, 0); } else if (min2 == G_MININT) { return gst_value_create_new_range (dest, MAX (max2 + 1, min1), max1, 1, 0); } else { return gst_value_create_new_range (dest, min1, MIN (min2 - 1, max1), MAX (max2 + 1, min1), max1); } } static gboolean gst_value_subtract_double_double_range (GValue * dest, const GValue * minuend, const GValue * subtrahend) { double min = gst_value_get_double_range_min (subtrahend); double max = gst_value_get_double_range_max (subtrahend); double val = g_value_get_double (minuend); if (val < min || val > max) { gst_value_init_and_copy (dest, minuend); return TRUE; } return FALSE; } static gboolean gst_value_subtract_double_range_double (GValue * dest, const GValue * minuend, const GValue * subtrahend) { /* since we don't have open ranges, we cannot create a hole in * a double range. We return the original range */ gst_value_init_and_copy (dest, minuend); return TRUE; } static gboolean gst_value_subtract_double_range_double_range (GValue * dest, const GValue * minuend, const GValue * subtrahend) { /* since we don't have open ranges, we have to approximate */ /* done like with ints */ double min1 = gst_value_get_double_range_min (minuend); double max2 = gst_value_get_double_range_max (minuend); double max1 = MIN (gst_value_get_double_range_min (subtrahend), max2); double min2 = MAX (gst_value_get_double_range_max (subtrahend), min1); GValue v1 = { 0, }; GValue v2 = { 0, }; GValue *pv1, *pv2; /* yeah, hungarian! */ if (min1 < max1 && min2 < max2) { pv1 = &v1; pv2 = &v2; } else if (min1 < max1) { pv1 = dest; pv2 = NULL; } else if (min2 < max2) { pv1 = NULL; pv2 = dest; } else { return FALSE; } if (min1 < max1) { g_value_init (pv1, GST_TYPE_DOUBLE_RANGE); gst_value_set_double_range (pv1, min1, max1); } if (min2 < max2) { g_value_init (pv2, GST_TYPE_DOUBLE_RANGE); gst_value_set_double_range (pv2, min2, max2); } if (min1 < max1 && min2 < max2) { gst_value_list_concat (dest, pv1, pv2); g_value_unset (pv1); g_value_unset (pv2); } return TRUE; } static gboolean gst_value_subtract_from_list (GValue * dest, const GValue * minuend, const GValue * subtrahend) { guint i, size; GValue subtraction = { 0, }; gboolean ret = FALSE; size = gst_value_list_get_size (minuend); for (i = 0; i < size; i++) { const GValue *cur = gst_value_list_get_value (minuend, i); if (gst_value_subtract (&subtraction, cur, subtrahend)) { if (!ret) { gst_value_init_and_copy (dest, &subtraction); ret = TRUE; } else if (GST_VALUE_HOLDS_LIST (dest) && GST_VALUE_HOLDS_LIST (&subtraction)) { /* unroll */ GValue unroll = { 0, }; gst_value_init_and_copy (&unroll, dest); g_value_unset (dest); gst_value_list_concat (dest, &unroll, &subtraction); } else if (GST_VALUE_HOLDS_LIST (dest)) { gst_value_list_append_value (dest, &subtraction); } else { GValue temp = { 0, }; gst_value_init_and_copy (&temp, dest); g_value_unset (dest); gst_value_list_concat (dest, &temp, &subtraction); g_value_unset (&temp); } g_value_unset (&subtraction); } } return ret; } static gboolean gst_value_subtract_list (GValue * dest, const GValue * minuend, const GValue * subtrahend) { guint i, size; GValue data[2] = { {0,}, {0,} }; GValue *subtraction = &data[0], *result = &data[1]; gst_value_init_and_copy (result, minuend); size = gst_value_list_get_size (subtrahend); for (i = 0; i < size; i++) { const GValue *cur = gst_value_list_get_value (subtrahend, i); if (gst_value_subtract (subtraction, result, cur)) { GValue *temp = result; result = subtraction; subtraction = temp; g_value_unset (subtraction); } else { g_value_unset (result); return FALSE; } } gst_value_init_and_copy (dest, result); g_value_unset (result); return TRUE; } /************** * comparison * **************/ /** * gst_value_can_compare: * @value1: a value to compare * @value2: another value to compare * * Determines if @value1 and @value2 can be compared. * * Returns: TRUE if the values can be compared */ gboolean gst_value_can_compare (const GValue * value1, const GValue * value2) { GstValueTable *table; guint i; if (G_VALUE_TYPE (value1) != G_VALUE_TYPE (value2)) return FALSE; for (i = 0; i < gst_value_table->len; i++) { table = &g_array_index (gst_value_table, GstValueTable, i); if (g_type_is_a (G_VALUE_TYPE (value1), table->type) && table->compare) return TRUE; } return FALSE; } /** * gst_value_compare: * @value1: a value to compare * @value2: another value to compare * * Compares @value1 and @value2. If @value1 and @value2 cannot be * compared, the function returns GST_VALUE_UNORDERED. Otherwise, * if @value1 is greater than @value2, GST_VALUE_GREATER is returned. * If @value1 is less than @value2, GST_VALUE_LESSER is returned. * If the values are equal, GST_VALUE_EQUAL is returned. * * Returns: A GstValueCompareType value */ int gst_value_compare (const GValue * value1, const GValue * value2) { GstValueTable *table, *best = NULL; guint i; if (G_VALUE_TYPE (value1) != G_VALUE_TYPE (value2)) return GST_VALUE_UNORDERED; for (i = 0; i < gst_value_table->len; i++) { table = &g_array_index (gst_value_table, GstValueTable, i); if (table->type == G_VALUE_TYPE (value1) && table->compare != NULL) { best = table; break; } if (g_type_is_a (G_VALUE_TYPE (value1), table->type)) { if (!best || g_type_is_a (table->type, best->type)) best = table; } } if (best) { return best->compare (value1, value2); } g_critical ("unable to compare values of type %s\n", g_type_name (G_VALUE_TYPE (value1))); return GST_VALUE_UNORDERED; } /* union */ /** * gst_value_can_union: * @value1: a value to union * @value2: another value to union * * Determines if @value1 and @value2 can be non-trivially unioned. * Any two values can be trivially unioned by adding both of them * to a GstValueList. However, certain types have the possibility * to be unioned in a simpler way. For example, an integer range * and an integer can be unioned if the integer is a subset of the * integer range. If there is the possibility that two values can * be unioned, this function returns TRUE. * * Returns: TRUE if there is a function allowing the two values to * be unioned. */ gboolean gst_value_can_union (const GValue * value1, const GValue * value2) { GstValueUnionInfo *union_info; guint i; for (i = 0; i < gst_value_union_funcs->len; i++) { union_info = &g_array_index (gst_value_union_funcs, GstValueUnionInfo, i); if (union_info->type1 == G_VALUE_TYPE (value1) && union_info->type2 == G_VALUE_TYPE (value2)) return TRUE; if (union_info->type1 == G_VALUE_TYPE (value2) && union_info->type2 == G_VALUE_TYPE (value1)) return TRUE; } return FALSE; } /** * gst_value_union: * @dest: the destination value * @value1: a value to union * @value2: another value to union * * Creates a GValue cooresponding to the union of @value1 and @value2. * * Returns: %TRUE if a union was successful */ /* FIXME: change return type to 'void'? */ gboolean gst_value_union (GValue * dest, const GValue * value1, const GValue * value2) { GstValueUnionInfo *union_info; guint i; for (i = 0; i < gst_value_union_funcs->len; i++) { union_info = &g_array_index (gst_value_union_funcs, GstValueUnionInfo, i); if (union_info->type1 == G_VALUE_TYPE (value1) && union_info->type2 == G_VALUE_TYPE (value2)) { if (union_info->func (dest, value1, value2)) { return TRUE; } } if (union_info->type1 == G_VALUE_TYPE (value2) && union_info->type2 == G_VALUE_TYPE (value1)) { if (union_info->func (dest, value2, value1)) { return TRUE; } } } gst_value_list_concat (dest, value1, value2); return TRUE; } /** * gst_value_register_union_func: * @type1: a type to union * @type2: another type to union * @func: a function that implments creating a union between the two types * * Registers a union function that can create a union between GValues * of the type @type1 and @type2. * */ void gst_value_register_union_func (GType type1, GType type2, GstValueUnionFunc func) { GstValueUnionInfo union_info; union_info.type1 = type1; union_info.type2 = type2; union_info.func = func; g_array_append_val (gst_value_union_funcs, union_info); } /* intersection */ /** * gst_value_can_intersect: * @value1: a value to intersect * @value2: another value to intersect * * Determines if intersecting two values will produce a valid result. * Two values will produce a valid intersection if they have the same * type, or if there is a method (registered by * #gst_value_register_intersection_func) to calculate the intersection. * * Returns: TRUE if the values can intersect */ gboolean gst_value_can_intersect (const GValue * value1, const GValue * value2) { GstValueIntersectInfo *intersect_info; guint i; /* special cases */ if (GST_VALUE_HOLDS_LIST (value1) || GST_VALUE_HOLDS_LIST (value2)) return TRUE; for (i = 0; i < gst_value_intersect_funcs->len; i++) { intersect_info = &g_array_index (gst_value_intersect_funcs, GstValueIntersectInfo, i); if (intersect_info->type1 == G_VALUE_TYPE (value1) && intersect_info->type2 == G_VALUE_TYPE (value2)) if (intersect_info->type2 == G_VALUE_TYPE (value1) && intersect_info->type1 == G_VALUE_TYPE (value2)) return TRUE; } return gst_value_can_compare (value1, value2); } /** * gst_value_intersect: * @dest: a uninitialized #GValue that will hold the calculated * intersection value * @value1: a value to intersect * @value2: another value to intersect * * Calculates the intersection of two values. If the values have * a non-empty intersection, the value representing the intersection * is placed in @dest. If the intersection is non-empty, @dest is * not modified. * * Returns: TRUE if the intersection is non-empty */ gboolean gst_value_intersect (GValue * dest, const GValue * value1, const GValue * value2) { GstValueIntersectInfo *intersect_info; guint i; gboolean ret = FALSE; /* special cases first */ if (GST_VALUE_HOLDS_LIST (value1)) return gst_value_intersect_list (dest, value1, value2); if (GST_VALUE_HOLDS_LIST (value2)) return gst_value_intersect_list (dest, value2, value1); for (i = 0; i < gst_value_intersect_funcs->len; i++) { intersect_info = &g_array_index (gst_value_intersect_funcs, GstValueIntersectInfo, i); if (intersect_info->type1 == G_VALUE_TYPE (value1) && intersect_info->type2 == G_VALUE_TYPE (value2)) { ret = intersect_info->func (dest, value1, value2); return ret; } if (intersect_info->type1 == G_VALUE_TYPE (value2) && intersect_info->type2 == G_VALUE_TYPE (value1)) { ret = intersect_info->func (dest, value2, value1); return ret; } } if (gst_value_compare (value1, value2) == GST_VALUE_EQUAL) { gst_value_init_and_copy (dest, value1); ret = TRUE; } return ret; } /** * gst_value_register_intersect_func: * @type1: the first type to intersect * @type2: the second type to intersect * @func: the intersection function * * Registers a function that is called to calculate the intersection * of the values having the types @type1 and @type2. */ void gst_value_register_intersect_func (GType type1, GType type2, GstValueIntersectFunc func) { GstValueIntersectInfo intersect_info; intersect_info.type1 = type1; intersect_info.type2 = type2; intersect_info.func = func; g_array_append_val (gst_value_intersect_funcs, intersect_info); } /* subtraction */ /** * gst_value_subtract: * @dest: the destination value for the result if the subtraction is not empty * @minuend: the value to subtract from * @subtrahend: the value to subtract * * Subtracts @subtrahend from @minuend and stores the result in @dest. * Note that this means subtraction as in sets, not as in mathematics. * * Returns: %TRUE if the subtraction is not empty */ gboolean gst_value_subtract (GValue * dest, const GValue * minuend, const GValue * subtrahend) { GstValueSubtractInfo *info; guint i; /* special cases first */ if (GST_VALUE_HOLDS_LIST (minuend)) return gst_value_subtract_from_list (dest, minuend, subtrahend); if (GST_VALUE_HOLDS_LIST (subtrahend)) return gst_value_subtract_list (dest, minuend, subtrahend); for (i = 0; i < gst_value_subtract_funcs->len; i++) { info = &g_array_index (gst_value_subtract_funcs, GstValueSubtractInfo, i); if (info->minuend == G_VALUE_TYPE (minuend) && info->subtrahend == G_VALUE_TYPE (subtrahend)) { return info->func (dest, minuend, subtrahend); } } if (gst_value_compare (minuend, subtrahend) != GST_VALUE_EQUAL) { gst_value_init_and_copy (dest, minuend); return TRUE; } return FALSE; } #if 0 gboolean gst_value_subtract (GValue * dest, const GValue * minuend, const GValue * subtrahend) { gboolean ret = gst_value_subtract2 (dest, minuend, subtrahend); g_printerr ("\"%s\" - \"%s\" = \"%s\"\n", gst_value_serialize (minuend), gst_value_serialize (subtrahend), ret ? gst_value_serialize (dest) : "---"); return ret; } #endif /** * gst_value_can_subtract: * @minuend: the value to subtract from * @subtrahend: the value to subtract * * Checks if it's possible to subtract @subtrahend from @minuend. * * Returns: TRUE if a subtraction is possible */ gboolean gst_value_can_subtract (const GValue * minuend, const GValue * subtrahend) { GstValueSubtractInfo *info; guint i; /* special cases */ if (GST_VALUE_HOLDS_LIST (minuend) || GST_VALUE_HOLDS_LIST (subtrahend)) return TRUE; for (i = 0; i < gst_value_subtract_funcs->len; i++) { info = &g_array_index (gst_value_subtract_funcs, GstValueSubtractInfo, i); if (info->minuend == G_VALUE_TYPE (minuend) && info->subtrahend == G_VALUE_TYPE (subtrahend)) return TRUE; } return gst_value_can_compare (minuend, subtrahend); } /** * gst_value_register_subtract_func: * @minuend_type: type of the minuend * @subtrahend_type: type of the subtrahend * @func: function to use * * Registers @func as a function capable of subtracting the values of * @subtrahend_type from values of @minuend_type. */ void gst_value_register_subtract_func (GType minuend_type, GType subtrahend_type, GstValueSubtractFunc func) { GstValueSubtractInfo info; /* one type must be unfixed, other subtractions can be done as comparisons */ g_return_if_fail (!gst_type_is_fixed (minuend_type) || !gst_type_is_fixed (subtrahend_type)); info.minuend = minuend_type; info.subtrahend = subtrahend_type; info.func = func; g_array_append_val (gst_value_subtract_funcs, info); } /** * gst_value_register: * @table: structure containing functions to register * * Registers functions to perform calculations on #GValues of a given * type. */ /** * GstValueTable: * @type: GType that the functions operate on. * @compare: A function that compares two values of this type. * @serialize: A function that transforms a value of this type to a * string. Strings created by this function must be unique and should * be human readable. * @deserialize: A function that transforms a string to a value of * this type. This function must transform strings created by the * serialize function back to the original value. This function may * optionally transform other strings into values. */ void gst_value_register (const GstValueTable * table) { g_array_append_val (gst_value_table, *table); } /** * gst_value_init_and_copy: * @dest: the target value * @src: the source value * * Initialises the target value to be of the same type as source and then copies * the contents from source to target. */ void gst_value_init_and_copy (GValue * dest, const GValue * src) { g_value_init (dest, G_VALUE_TYPE (src)); g_value_copy (src, dest); } /** * gst_value_serialize: * @value: a #GValue to serialize * * tries to transform the given @value into a string representation that allows * getting back this string later on using gst_value_deserialize(). * * Returns: the serialization for @value or NULL if none exists */ gchar * gst_value_serialize (const GValue * value) { guint i; GValue s_val = { 0 }; GstValueTable *table, *best = NULL; char *s; g_return_val_if_fail (G_IS_VALUE (value), NULL); for (i = 0; i < gst_value_table->len; i++) { table = &g_array_index (gst_value_table, GstValueTable, i); if (table->serialize == NULL) continue; if (table->type == G_VALUE_TYPE (value)) { best = table; break; } if (g_type_is_a (G_VALUE_TYPE (value), table->type)) { if (!best || g_type_is_a (table->type, best->type)) best = table; } } if (best) return best->serialize (value); g_value_init (&s_val, G_TYPE_STRING); if (g_value_transform (value, &s_val)) { s = gst_string_wrap (g_value_get_string (&s_val)); } else { s = NULL; } g_value_unset (&s_val); return s; } /** * gst_value_deserialize: * @dest: #GValue to fill with contents of deserialization * @src: string to deserialize * * Tries to deserialize a string into the type specified by the given GValue. * If the operation succeeds, TRUE is returned, FALSE otherwise. * * Returns: TRUE on success */ gboolean gst_value_deserialize (GValue * dest, const gchar * src) { GstValueTable *table, *best = NULL; guint i; g_return_val_if_fail (src != NULL, FALSE); g_return_val_if_fail (G_IS_VALUE (dest), FALSE); for (i = 0; i < gst_value_table->len; i++) { table = &g_array_index (gst_value_table, GstValueTable, i); if (table->serialize == NULL) continue; if (table->type == G_VALUE_TYPE (dest)) { best = table; break; } if (g_type_is_a (G_VALUE_TYPE (dest), table->type)) { if (!best || g_type_is_a (table->type, best->type)) best = table; } } if (best) { return best->deserialize (dest, src); } return FALSE; } /** * gst_value_is_fixed: * @value: the #GValue to check * * Tests if the given GValue, if available in a GstStructure (or any other * container) contains a "fixed" (which means: one value) or an "unfixed" * (which means: multiple possible values, such as data lists or data * ranges) value. * * Returns: true if the value is "fixed". */ gboolean gst_value_is_fixed (const GValue * value) { GType type = G_VALUE_TYPE (value); if (type == GST_TYPE_ARRAY) { gboolean fixed = TRUE; gint size, n; const GValue *kid; /* check recursively */ size = gst_value_array_get_size (value); for (n = 0; n < size; n++) { kid = gst_value_array_get_value (value, n); fixed &= gst_value_is_fixed (kid); } return fixed; } return gst_type_is_fixed (type); } /************ * fraction * ************/ /* helper functions */ /* Finds the greatest common divisor. * Returns 1 if none other found. * This is Euclid's algorithm. */ static gint gst_greatest_common_divisor (gint a, gint b) { while (b != 0) { int temp = a; a = b; b = temp % b; } return ABS (a); } static void gst_value_init_fraction (GValue * value) { value->data[0].v_int = 0; value->data[1].v_int = 1; } static void gst_value_copy_fraction (const GValue * src_value, GValue * dest_value) { dest_value->data[0].v_int = src_value->data[0].v_int; dest_value->data[1].v_int = src_value->data[1].v_int; } static gchar * gst_value_collect_fraction (GValue * value, guint n_collect_values, GTypeCValue * collect_values, guint collect_flags) { gst_value_set_fraction (value, collect_values[0].v_int, collect_values[1].v_int); return NULL; } static gchar * gst_value_lcopy_fraction (const GValue * value, guint n_collect_values, GTypeCValue * collect_values, guint collect_flags) { gint *numerator = collect_values[0].v_pointer; gint *denominator = collect_values[1].v_pointer; if (!numerator) return g_strdup_printf ("numerator for `%s' passed as NULL", G_VALUE_TYPE_NAME (value)); if (!denominator) return g_strdup_printf ("denominator for `%s' passed as NULL", G_VALUE_TYPE_NAME (value)); *numerator = value->data[0].v_int; *denominator = value->data[1].v_int; return NULL; } /** * gst_value_set_fraction: * @value: a GValue initialized to #GST_TYPE_FRACTION * @numerator: the numerator of the fraction * @denominator: the denominator of the fraction * * Sets @value to the fraction specified by @numerator over @denominator. * The fraction gets reduced to the smallest numerator and denominator, * and if necessary the sign is moved to the numerator. */ void gst_value_set_fraction (GValue * value, gint numerator, gint denominator) { gint gcd = 0; g_return_if_fail (GST_VALUE_HOLDS_FRACTION (value)); g_return_if_fail (denominator != 0); g_return_if_fail (denominator >= -G_MAXINT); g_return_if_fail (numerator >= -G_MAXINT); /* normalize sign */ if (denominator < 0) { numerator = -numerator; denominator = -denominator; } /* check for reduction */ gcd = gst_greatest_common_divisor (numerator, denominator); if (gcd) { numerator /= gcd; denominator /= gcd; } g_assert (denominator > 0); value->data[0].v_int = numerator; value->data[1].v_int = denominator; } /** * gst_value_get_fraction_numerator: * @value: a GValue initialized to #GST_TYPE_FRACTION * * Gets the numerator of the fraction specified by @value. * * Returns: the numerator of the fraction. */ int gst_value_get_fraction_numerator (const GValue * value) { g_return_val_if_fail (GST_VALUE_HOLDS_FRACTION (value), 0); return value->data[0].v_int; } /** * gst_value_get_fraction_denominator: * @value: a GValue initialized to #GST_TYPE_FRACTION * * Gets the denominator of the fraction specified by @value. * * Returns: the denominator of the fraction. */ int gst_value_get_fraction_denominator (const GValue * value) { g_return_val_if_fail (GST_VALUE_HOLDS_FRACTION (value), 1); return value->data[1].v_int; } /** * gst_value_fraction_multiply: * @product: a GValue initialized to #GST_TYPE_FRACTION * @factor1: a GValue initialized to #GST_TYPE_FRACTION * @factor2: a GValue initialized to #GST_TYPE_FRACTION * * Multiplies the two GValues containing a GstFraction and sets @product * to the product of the two fractions. * * Returns: FALSE in case of an error (like integer overflow), TRUE otherwise. */ gboolean gst_value_fraction_multiply (GValue * product, const GValue * factor1, const GValue * factor2) { gint gcd, n1, n2, d1, d2; g_return_val_if_fail (GST_VALUE_HOLDS_FRACTION (factor1), FALSE); g_return_val_if_fail (GST_VALUE_HOLDS_FRACTION (factor2), FALSE); n1 = factor1->data[0].v_int; n2 = factor2->data[0].v_int; d1 = factor1->data[1].v_int; d2 = factor2->data[1].v_int; gcd = gst_greatest_common_divisor (n1, d2); n1 /= gcd; d2 /= gcd; gcd = gst_greatest_common_divisor (n2, d1); n2 /= gcd; d1 /= gcd; g_return_val_if_fail (n1 == 0 || G_MAXINT / ABS (n1) >= ABS (n2), FALSE); g_return_val_if_fail (G_MAXINT / ABS (d1) >= ABS (d2), FALSE); gst_value_set_fraction (product, n1 * n2, d1 * d2); return TRUE; } static char * gst_value_serialize_fraction (const GValue * value) { gint32 numerator = value->data[0].v_int; gint32 denominator = value->data[1].v_int; gboolean positive = TRUE; /* get the sign and make components absolute */ if (numerator < 0) { numerator = -numerator; positive = !positive; } if (denominator < 0) { denominator = -denominator; positive = !positive; } return g_strdup_printf ("%s%d/%d", positive ? "" : "-", numerator, denominator); } static gboolean gst_value_deserialize_fraction (GValue * dest, const char *s) { gint num, den; if (s && sscanf (s, "%d/%d", &num, &den) == 2) { gst_value_set_fraction (dest, num, den); return TRUE; } return FALSE; } static void gst_value_transform_fraction_string (const GValue * src_value, GValue * dest_value) { dest_value->data[0].v_pointer = gst_value_serialize_fraction (src_value); } static void gst_value_transform_string_fraction (const GValue * src_value, GValue * dest_value) { if (!gst_value_deserialize_fraction (dest_value, src_value->data[0].v_pointer)) /* If the deserialize fails, ensure we leave the fraction in a * valid, if incorrect, state */ gst_value_set_fraction (dest_value, 0, 1); } #define MAX_TERMS 30 #define MIN_DIVISOR 1.0e-10 #define MAX_ERROR 1.0e-20 /* use continued fractions to transform a double into a fraction, * see http://mathforum.org/dr.math/faq/faq.fractions.html#decfrac. * This algorithm takes care of overflows. */ static void gst_value_transform_double_fraction (const GValue * src_value, GValue * dest_value) { gdouble V, F; /* double being converted */ gint N, D; /* will contain the result */ gint A; /* current term in continued fraction */ gint64 N1, D1; /* numerator, denominator of last approx */ gint64 N2, D2; /* numerator, denominator of previous approx */ gint i; gboolean negative = FALSE; /* initialize fraction being converted */ F = src_value->data[0].v_double; if (F < 0.0) { F = -F; negative = TRUE; } V = F; /* initialize fractions with 1/0, 0/1 */ N1 = 1; D1 = 0; N2 = 0; D2 = 1; N = 1; D = 1; for (i = 0; i < MAX_TERMS; i++) { /* get next term */ A = floor (F); /* get new divisor */ F = F - A; /* calculate new fraction in temp */ N2 = N1 * A + N2; D2 = D1 * A + D2; /* guard against overflow */ if (N2 > G_MAXINT || D2 > G_MAXINT) { break; } N = N2; D = D2; /* save last two fractions */ N2 = N1; D2 = D1; N1 = N; D1 = D; /* quit if dividing by zero or close enough to target */ if (F < MIN_DIVISOR || fabs (V - ((gdouble) N) / D) < MAX_ERROR) { break; } /* Take reciprocal */ F = 1 / F; } /* fix for overflow */ if (D == 0) { N = G_MAXINT; D = 1; } /* fix for negative */ if (negative) N = -N; /* will also simplify */ gst_value_set_fraction (dest_value, N, D); } static void gst_value_transform_fraction_double (const GValue * src_value, GValue * dest_value) { dest_value->data[0].v_double = ((double) src_value->data[0].v_int) / ((double) src_value->data[1].v_int); } static int gst_value_compare_fraction (const GValue * value1, const GValue * value2) { gint n1, n2; gint d1, d2; gint64 new_num_1; gint64 new_num_2; n1 = value1->data[0].v_int; n2 = value2->data[0].v_int; d1 = value1->data[1].v_int; d2 = value2->data[1].v_int; /* fractions are reduced when set, so we can quickly see if they're equal */ if (n1 == n2 && d1 == d2) return GST_VALUE_EQUAL; /* extend to 64 bits */ new_num_1 = ((gint64) n1) * d2; new_num_2 = ((gint64) n2) * d1; if (new_num_1 < new_num_2) return GST_VALUE_LESS_THAN; if (new_num_1 > new_num_2) return GST_VALUE_GREATER_THAN; /* new_num_1 == new_num_2 implies that both denominators must have * been 0, beause otherwise simplification would have caught the * equivalence */ g_assert_not_reached (); return GST_VALUE_UNORDERED; } /********* * GDate * *********/ /** * gst_value_set_date: * @value: a GValue initialized to GST_TYPE_DATE * @date: the date to set the value to * * Sets the contents of @value to coorespond to @date. The actual * #GDate structure is copied before it is used. */ void gst_value_set_date (GValue * value, const GDate * date) { g_return_if_fail (G_VALUE_TYPE (value) == GST_TYPE_DATE); g_value_set_boxed (value, date); } /** * gst_value_get_date: * @value: a GValue initialized to GST_TYPE_DATE * * Gets the contents of @value. * * Returns: the contents of @value */ const GDate * gst_value_get_date (const GValue * value) { g_return_val_if_fail (G_VALUE_TYPE (value) == GST_TYPE_DATE, NULL); return (const GDate *) g_value_get_boxed (value); } static gpointer gst_date_copy (gpointer boxed) { const GDate *date = (const GDate *) boxed; return g_date_new_julian (g_date_get_julian (date)); } static int gst_value_compare_date (const GValue * value1, const GValue * value2) { const GDate *date1 = (const GDate *) g_value_get_boxed (value1); const GDate *date2 = (const GDate *) g_value_get_boxed (value2); guint32 j1, j2; if (date1 == date2) return GST_VALUE_EQUAL; if ((date1 == NULL || !g_date_valid (date1)) && (date2 != NULL && g_date_valid (date2))) { return GST_VALUE_LESS_THAN; } if ((date2 == NULL || !g_date_valid (date2)) && (date1 != NULL && g_date_valid (date1))) { return GST_VALUE_GREATER_THAN; } if (date1 == NULL || date2 == NULL || !g_date_valid (date1) || !g_date_valid (date2)) { return GST_VALUE_UNORDERED; } j1 = g_date_get_julian (date1); j2 = g_date_get_julian (date2); if (j1 == j2) return GST_VALUE_EQUAL; else if (j1 < j2) return GST_VALUE_LESS_THAN; else return GST_VALUE_GREATER_THAN; } static char * gst_value_serialize_date (const GValue * val) { const GDate *date = (const GDate *) g_value_get_boxed (val); if (date == NULL || !g_date_valid (date)) return g_strdup ("9999-99-99"); return g_strdup_printf ("%04u-%02u-%02u", g_date_get_year (date), g_date_get_month (date), g_date_get_day (date)); } static gboolean gst_value_deserialize_date (GValue * dest, const char *s) { guint year, month, day; if (!s || sscanf (s, "%04u-%02u-%02u", &year, &month, &day) != 3) return FALSE; if (!g_date_valid_dmy (day, month, year)) return FALSE; g_value_take_boxed (dest, g_date_new_dmy (day, month, year)); return TRUE; } static void gst_value_transform_date_string (const GValue * src_value, GValue * dest_value) { dest_value->data[0].v_pointer = gst_value_serialize_date (src_value); } static void gst_value_transform_string_date (const GValue * src_value, GValue * dest_value) { gst_value_deserialize_date (dest_value, src_value->data[0].v_pointer); } static GTypeInfo _info = { 0, NULL, NULL, NULL, NULL, NULL, 0, 0, NULL, NULL, }; static GTypeFundamentalInfo _finfo = { 0 }; #define FUNC_VALUE_GET_TYPE(type, name) \ GType gst_ ## type ## _get_type (void) \ { \ static GType gst_ ## type ## _type = 0; \ \ if (!gst_ ## type ## _type) { \ _info.value_table = & _gst_ ## type ## _value_table; \ gst_ ## type ## _type = g_type_register_fundamental ( \ g_type_fundamental_next (), \ name, &_info, &_finfo, 0); \ } \ \ return gst_ ## type ## _type; \ } static const GTypeValueTable _gst_fourcc_value_table = { gst_value_init_fourcc, NULL, gst_value_copy_fourcc, NULL, "i", gst_value_collect_fourcc, "p", gst_value_lcopy_fourcc }; FUNC_VALUE_GET_TYPE (fourcc, "GstFourcc"); static const GTypeValueTable _gst_int_range_value_table = { gst_value_init_int_range, NULL, gst_value_copy_int_range, NULL, "ii", gst_value_collect_int_range, "pp", gst_value_lcopy_int_range }; FUNC_VALUE_GET_TYPE (int_range, "GstIntRange"); static const GTypeValueTable _gst_double_range_value_table = { gst_value_init_double_range, NULL, gst_value_copy_double_range, NULL, "dd", gst_value_collect_double_range, "pp", gst_value_lcopy_double_range }; FUNC_VALUE_GET_TYPE (double_range, "GstDoubleRange"); static const GTypeValueTable _gst_value_list_value_table = { gst_value_init_list_or_array, gst_value_free_list_or_array, gst_value_copy_list_or_array, gst_value_list_or_array_peek_pointer, "p", gst_value_collect_list_or_array, "p", gst_value_lcopy_list_or_array }; FUNC_VALUE_GET_TYPE (value_list, "GstValueList"); static const GTypeValueTable _gst_value_array_value_table = { gst_value_init_list_or_array, gst_value_free_list_or_array, gst_value_copy_list_or_array, gst_value_list_or_array_peek_pointer, "p", gst_value_collect_list_or_array, "p", gst_value_lcopy_list_or_array }; FUNC_VALUE_GET_TYPE (value_array, "GstValueArray"); static const GTypeValueTable _gst_fraction_value_table = { gst_value_init_fraction, NULL, gst_value_copy_fraction, NULL, "ii", gst_value_collect_fraction, "pp", gst_value_lcopy_fraction }; FUNC_VALUE_GET_TYPE (fraction, "GstFraction"); GType gst_date_get_type (void) { static GType gst_date_type = 0; if (!gst_date_type) { /* Not using G_TYPE_DATE here on purpose, even if we could * if GLIB_CHECK_VERSION(2,8,0) was true: we don't want the * serialised strings to have different type strings depending * on what version is used, so FIXME in 0.11 when we * require GLib-2.8 */ gst_date_type = g_boxed_type_register_static ("GstDate", (GBoxedCopyFunc) gst_date_copy, (GBoxedFreeFunc) g_date_free); } return gst_date_type; } void _gst_value_initialize (void) { //const GTypeFundamentalInfo finfo = { G_TYPE_FLAG_DERIVABLE, }; gst_value_table = g_array_new (FALSE, FALSE, sizeof (GstValueTable)); gst_value_union_funcs = g_array_new (FALSE, FALSE, sizeof (GstValueUnionInfo)); gst_value_intersect_funcs = g_array_new (FALSE, FALSE, sizeof (GstValueIntersectInfo)); gst_value_subtract_funcs = g_array_new (FALSE, FALSE, sizeof (GstValueSubtractInfo)); { static GstValueTable gst_value = { 0, gst_value_compare_fourcc, gst_value_serialize_fourcc, gst_value_deserialize_fourcc, }; gst_value.type = gst_fourcc_get_type (); gst_value_register (&gst_value); } { static GstValueTable gst_value = { 0, gst_value_compare_int_range, gst_value_serialize_int_range, gst_value_deserialize_int_range, }; gst_value.type = gst_int_range_get_type (); gst_value_register (&gst_value); } { static GstValueTable gst_value = { 0, gst_value_compare_double_range, gst_value_serialize_double_range, gst_value_deserialize_double_range, }; gst_value.type = gst_double_range_get_type (); gst_value_register (&gst_value); } { static GstValueTable gst_value = { 0, gst_value_compare_list_or_array, gst_value_serialize_list, gst_value_deserialize_list, }; gst_value.type = gst_value_list_get_type (); gst_value_register (&gst_value); } { static GstValueTable gst_value = { 0, gst_value_compare_list_or_array, gst_value_serialize_array, gst_value_deserialize_array, }; gst_value.type = gst_value_array_get_type ();; gst_value_register (&gst_value); } { #if 0 static const GTypeValueTable value_table = { gst_value_init_buffer, NULL, gst_value_copy_buffer, NULL, "i", NULL, /*gst_value_collect_buffer, */ "p", NULL /*gst_value_lcopy_buffer */ }; #endif static GstValueTable gst_value = { 0, gst_value_compare_buffer, gst_value_serialize_buffer, gst_value_deserialize_buffer, }; gst_value.type = GST_TYPE_BUFFER; gst_value_register (&gst_value); } { static GstValueTable gst_value = { 0, gst_value_compare_fraction, gst_value_serialize_fraction, gst_value_deserialize_fraction, }; gst_value.type = gst_fraction_get_type (); gst_value_register (&gst_value); } { static GstValueTable gst_value = { 0, NULL, gst_value_serialize_caps, gst_value_deserialize_caps, }; gst_value.type = GST_TYPE_CAPS; gst_value_register (&gst_value); } { static GstValueTable gst_value = { 0, gst_value_compare_date, gst_value_serialize_date, gst_value_deserialize_date, }; gst_value.type = gst_date_get_type (); gst_value_register (&gst_value); } REGISTER_SERIALIZATION (G_TYPE_DOUBLE, double); REGISTER_SERIALIZATION (G_TYPE_FLOAT, float); REGISTER_SERIALIZATION (G_TYPE_STRING, string); REGISTER_SERIALIZATION (G_TYPE_BOOLEAN, boolean); REGISTER_SERIALIZATION (G_TYPE_ENUM, enum); REGISTER_SERIALIZATION (G_TYPE_FLAGS, flags); REGISTER_SERIALIZATION (G_TYPE_INT, int); REGISTER_SERIALIZATION (G_TYPE_INT64, int64); REGISTER_SERIALIZATION (G_TYPE_LONG, long); REGISTER_SERIALIZATION (G_TYPE_UINT, uint); REGISTER_SERIALIZATION (G_TYPE_UINT64, uint64); REGISTER_SERIALIZATION (G_TYPE_ULONG, ulong); g_value_register_transform_func (GST_TYPE_FOURCC, G_TYPE_STRING, gst_value_transform_fourcc_string); g_value_register_transform_func (GST_TYPE_INT_RANGE, G_TYPE_STRING, gst_value_transform_int_range_string); g_value_register_transform_func (GST_TYPE_DOUBLE_RANGE, G_TYPE_STRING, gst_value_transform_double_range_string); g_value_register_transform_func (GST_TYPE_LIST, G_TYPE_STRING, gst_value_transform_list_string); g_value_register_transform_func (GST_TYPE_ARRAY, G_TYPE_STRING, gst_value_transform_array_string); g_value_register_transform_func (GST_TYPE_FRACTION, G_TYPE_STRING, gst_value_transform_fraction_string); g_value_register_transform_func (G_TYPE_STRING, GST_TYPE_FRACTION, gst_value_transform_string_fraction); g_value_register_transform_func (GST_TYPE_FRACTION, G_TYPE_DOUBLE, gst_value_transform_fraction_double); g_value_register_transform_func (G_TYPE_DOUBLE, GST_TYPE_FRACTION, gst_value_transform_double_fraction); g_value_register_transform_func (GST_TYPE_DATE, G_TYPE_STRING, gst_value_transform_date_string); g_value_register_transform_func (G_TYPE_STRING, GST_TYPE_DATE, gst_value_transform_string_date); gst_value_register_intersect_func (G_TYPE_INT, GST_TYPE_INT_RANGE, gst_value_intersect_int_int_range); gst_value_register_intersect_func (GST_TYPE_INT_RANGE, GST_TYPE_INT_RANGE, gst_value_intersect_int_range_int_range); gst_value_register_intersect_func (G_TYPE_DOUBLE, GST_TYPE_DOUBLE_RANGE, gst_value_intersect_double_double_range); gst_value_register_intersect_func (GST_TYPE_DOUBLE_RANGE, GST_TYPE_DOUBLE_RANGE, gst_value_intersect_double_range_double_range); gst_value_register_intersect_func (GST_TYPE_ARRAY, GST_TYPE_ARRAY, gst_value_intersect_array); gst_value_register_subtract_func (G_TYPE_INT, GST_TYPE_INT_RANGE, gst_value_subtract_int_int_range); gst_value_register_subtract_func (GST_TYPE_INT_RANGE, G_TYPE_INT, gst_value_subtract_int_range_int); gst_value_register_subtract_func (GST_TYPE_INT_RANGE, GST_TYPE_INT_RANGE, gst_value_subtract_int_range_int_range); gst_value_register_subtract_func (G_TYPE_DOUBLE, GST_TYPE_DOUBLE_RANGE, gst_value_subtract_double_double_range); gst_value_register_subtract_func (GST_TYPE_DOUBLE_RANGE, G_TYPE_DOUBLE, gst_value_subtract_double_range_double); gst_value_register_subtract_func (GST_TYPE_DOUBLE_RANGE, GST_TYPE_DOUBLE_RANGE, gst_value_subtract_double_range_double_range); #if GLIB_CHECK_VERSION(2,8,0) /* see bug #317246, #64994, #65041 */ { volatile GType date_type = G_TYPE_DATE; GST_LOG ("Faking out the compiler: %d", date_type); } #endif gst_value_register_union_func (G_TYPE_INT, GST_TYPE_INT_RANGE, gst_value_union_int_int_range); gst_value_register_union_func (GST_TYPE_INT_RANGE, GST_TYPE_INT_RANGE, gst_value_union_int_range_int_range); }