/**
 * \file mlt_properties.c
 * \brief Properties class definition
 * \see mlt_properties_s
 *
 * Copyright (C) 2003-2023 Meltytech, LLC
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

// For strtod_l
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif

#include "mlt_properties.h"
#include "mlt_deque.h"
#include "mlt_factory.h"
#include "mlt_log.h"
#include "mlt_property.h"

#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <float.h>
#include <locale.h>
#include <pthread.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>

#define MAX_LOAD_LINE_SIZE 4096

/** \brief private implementation of the property list */

typedef struct
{
    int hash[199];
    char **name;
    mlt_property *value;
    int count;
    int size;
    mlt_properties mirror;
    int ref_count;
    pthread_mutex_t mutex;
    mlt_locale_t locale;
    mlt_properties *children_properties;
    char **children_names;
    int children_count;
} property_list;

/* Memory leak checks */

//#define _MLT_PROPERTY_CHECKS_ 2
#ifdef _MLT_PROPERTY_CHECKS_
static int properties_created = 0;
static int properties_destroyed = 0;
#endif

/** Initialize a properties object that was already allocated.
 *
 * This does allocate its ::property_list, and it adds a reference count.
 * \public \memberof mlt_properties_s
 * \param self the properties structure to initialize
 * \param child an opaque pointer to a subclass object
 * \return true if failed
 */

int mlt_properties_init(mlt_properties self, void *child)
{
    if (self != NULL) {
#ifdef _MLT_PROPERTY_CHECKS_
        // Increment number of properties created
        properties_created++;
#endif

        // NULL all methods
        memset(self, 0, sizeof(struct mlt_properties_s));

        // Assign the child of the object
        self->child = child;

        // Allocate the local structure
        self->local = calloc(1, sizeof(property_list));

        // Increment the ref count
        ((property_list *) self->local)->ref_count = 1;
        pthread_mutex_init(&((property_list *) self->local)->mutex, NULL);
        ;
    }

    // Check that initialisation was successful
    return self != NULL && self->local == NULL;
}

/** Create a properties object.
 *
 * This allocates the properties structure and calls mlt_properties_init() on it.
 * Free the properties object with mlt_properties_close().
 * \public \memberof mlt_properties_s
 * \return a new properties object
 */

mlt_properties mlt_properties_new()
{
    // Construct a standalone properties object
    mlt_properties self = calloc(1, sizeof(struct mlt_properties_s));

    // Initialise self
    mlt_properties_init(self, NULL);

    // Return the pointer
    return self;
}

/** Set the numeric locale used for string/double conversions.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param locale the locale name
 * \return true if error
 */

int mlt_properties_set_lcnumeric(mlt_properties self, const char *locale)
{
    int error = 0;

#if !defined(_WIN32)
    if (self && locale) {
        property_list *list = self->local;

#if defined(__GLIBC__) || defined(__APPLE__)
        if (list->locale)
            freelocale(list->locale);
        list->locale = newlocale(LC_NUMERIC_MASK, locale, NULL);
#else

        free(list->locale);
        list->locale = strdup(locale);
#endif
    } else
        error = 1;
#endif // _WIN32

    return error;
}

/** Get the numeric locale for this properties object.
 *
 * Do not free the result.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \return the locale name if this properties has a specific locale it is using, NULL otherwise
 */

const char *mlt_properties_get_lcnumeric(mlt_properties self)
{
    if (!self)
        return NULL;

    const char *result = NULL;

#if !defined(_WIN32)
    property_list *list = self->local;
    if (list->locale) {
#if defined(__APPLE__)
        result = querylocale(LC_NUMERIC_MASK, list->locale);
#elif defined(__GLIBC__)
        result = list->locale->__names[LC_NUMERIC];
#else
        result = list->locale;
#endif
#if defined(_WIN32)
        if (result) {
            // Convert the string from ANSI code page to UTF-8.
            mlt_properties_set_string(self, "_lcnumeric_in", result);
            mlt_properties_to_utf8(self, "_lcnumeric_in", "_lcnumeric_out");
            result = mlt_properties_get(self, "_lcnumeric_out");
        }
#endif
    }
#endif // _WIN32
    return result;
}

static int load_properties(mlt_properties self, const char *filename)
{
    // Open the file
    FILE *file = mlt_fopen(filename, "r");

    // Load contents of file
    if (file != NULL) {
        // Temp string
        char temp[MAX_LOAD_LINE_SIZE];
        char last[MAX_LOAD_LINE_SIZE] = "";

        // Read each string from the file
        while (fgets(temp, MAX_LOAD_LINE_SIZE, file)) {
            // Chomp the new line character from the string
            int x = strlen(temp) - 1;
            if (temp[x] == '\n' || temp[x] == '\r')
                temp[x] = '\0';

            // Check if the line starts with a .
            if (temp[0] == '.') {
                char temp2[MAX_LOAD_LINE_SIZE];
                strcpy(temp2, last);
                strncat(temp2, temp, sizeof(temp2) - strlen(temp2) - 1);
                temp2[sizeof(temp2) - 1] = '\0';
                strcpy(temp, temp2);
            } else if (strchr(temp, '=')) {
                strcpy(last, temp);
                *(strchr(last, '=')) = '\0';
            }

            // Parse and set the property
            if (strcmp(temp, "") && temp[0] != '#')
                mlt_properties_parse(self, temp);
        }

        // Close the file
        fclose(file);
    }
    return file ? 0 : errno;
}

/** Create a properties object by reading a .properties text file.
 *
 * Free the properties object with mlt_properties_close().
 * \deprecated Please start using mlt_properties_parse_yaml().
 * \public \memberof mlt_properties_s
 * \param filename the absolute file name
 * \return a new properties object
 */

mlt_properties mlt_properties_load(const char *filename)
{
    // Construct a standalone properties object
    mlt_properties self = mlt_properties_new();

    if (self != NULL)
        load_properties(self, filename);

    // Return the pointer
    return self;
}

/** Set properties from a preset.
 *
 * Presets are typically installed to $prefix/share/mlt/presets/{type}/{service}/[{profile}/]{name}.
 * For example, "/usr/share/mlt/presets/consumer/avformat/dv_ntsc_wide/DVD"
 * could be an encoding preset for a widescreen NTSC DVD Video.
 * Do not specify the type and service in the preset name parameter; these are
 * inferred automatically from the service to which you are applying the preset.
 * Using the example above and assuming you are calling this function on the
 * avformat consumer, the name passed to the function should simply be DVD.
 * Note that the profile portion of the path is optional, but a profile-specific
 * preset with the same name as a more generic one is given a higher priority.
 * \todo Look in a user-specific location - somewhere in the home directory.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the name of a preset in a well-known location or the explicit path
 * \return true if error
 */

int mlt_properties_preset(mlt_properties self, const char *name)
{
    struct stat stat_buff;

    // validate input
    if (!(self && name && strlen(name)))
        return 1;

    // See if name is an explicit file
    if (!mlt_stat(name, &stat_buff)) {
        return load_properties(self, name);
    } else {
        // Look for profile-specific preset before a generic one.
        const char *data = mlt_environment("MLT_PRESETS_PATH");
        const char *type = mlt_properties_get(self, "mlt_type");
        const char *service = mlt_properties_get(self, "mlt_service");
        const char *profile = mlt_environment("MLT_PROFILE");
        int error = 0;

        if (data && type && service) {
            char *path = malloc(5 + strlen(name) + strlen(data) + strlen(type) + strlen(service)
                                + (profile ? strlen(profile) : 0));
            sprintf(path, "%s/%s/%s/%s/%s", data, type, service, profile, name);
            if (load_properties(self, path)) {
                sprintf(path, "%s/%s/%s/%s", data, type, service, name);
                error = load_properties(self, path);
            }
            free(path);
        } else {
            error = 1;
        }
        return error;
    }
}

/** Generate a hash key.
 *
 * \private \memberof mlt_properties_s
 * \param name a string
 * \return an integer
 */

static inline int generate_hash(const char *name)
{
    unsigned int hash = 5381;
    while (*name)
        hash = hash * 33 + (unsigned int) (*name++);
    return hash % 199;
}

/** Copy a serializable property to a properties list that is mirroring this one.
 *
 * Special case - when a container (such as loader) is protecting another
 * producer, we need to ensure that properties are passed through to the
 * real producer.
 * \private \memberof mlt_properties_s
 * \param self a properties list
 * \param name the name of the property to copy
 */

static inline void mlt_properties_do_mirror(mlt_properties self, const char *name)
{
    if (!self)
        return;
    property_list *list = self->local;
    if (list->mirror != NULL) {
        char *value = mlt_properties_get(self, name);
        if (value != NULL)
            mlt_properties_set_string(list->mirror, name, value);
    }
}

/** Increment the reference count.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \return the new reference count
 */

int mlt_properties_inc_ref(mlt_properties self)
{
    int result = 0;
    if (self != NULL) {
        property_list *list = self->local;
        pthread_mutex_lock(&list->mutex);
        result = ++list->ref_count;
        pthread_mutex_unlock(&list->mutex);
    }
    return result;
}

/** Decrement the reference count.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \return the new reference count
 */

int mlt_properties_dec_ref(mlt_properties self)
{
    int result = 0;
    if (self != NULL) {
        property_list *list = self->local;
        pthread_mutex_lock(&list->mutex);
        result = --list->ref_count;
        pthread_mutex_unlock(&list->mutex);
    }
    return result;
}

/** Get the reference count.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \return the current reference count
 */

int mlt_properties_ref_count(mlt_properties self)
{
    if (self != NULL) {
        property_list *list = self->local;
        return list->ref_count;
    }
    return 0;
}

/** Set a properties list to be a mirror copy of another.
 *
 * Note that this does not copy all existing properties. Rather, you must
 * call this before setting the properties that you wish to copy.
 * \public \memberof mlt_properties_s
 * \param that the properties which will receive copies of the properties as they are set.
 * \param self the properties to mirror
 */

void mlt_properties_mirror(mlt_properties self, mlt_properties that)
{
    if (!self)
        return;
    property_list *list = self->local;
    list->mirror = that;
}

/** Copy all serializable properties to another properties list.
 *
 * \public \memberof mlt_properties_s
 * \param self The properties to copy to
 * \param that The properties to copy from
 * \return true if error
 */

int mlt_properties_inherit(mlt_properties self, mlt_properties that)
{
    if (!self || !that)
        return 1;

    // Set "properties" first so preset overrides are reliable.
    char *value = mlt_properties_get(that, "properties");
    if (value)
        mlt_properties_set_string(self, "properties", value);

    mlt_properties_lock(that);

    int count = mlt_properties_count(that);
    int i = 0;
    for (i = 0; i < count; i++) {
        char *name = mlt_properties_get_name(that, i);
        if (name && strcmp("properties", name)) {
            char *value = mlt_properties_get_value(that, i);
            if (value != NULL) {
                mlt_properties_set_string(self, name, value);
            } else {
                mlt_properties that_child_props = mlt_properties_get_properties_at(that, i);
                if (that_child_props != NULL) {
                    mlt_properties child_props = mlt_properties_new();
                    mlt_properties_set_properties(self, name, child_props);
                    mlt_properties_inherit(child_props, that_child_props);
                }
            }
        }
    }

    mlt_properties_unlock(that);

    return 0;
}

/** Copy all serializable properties that match a prefix to another properties object
 *
 * \public \memberof mlt_properties_s
 * \param self the properties to copy to
 * \param that The properties to copy from
 * \param prefix the property names to match (required)
 * \return true if error
 */

int mlt_properties_copy(mlt_properties self, mlt_properties that, const char *prefix)
{
    if (!self || !that)
        return 1;
    int count = mlt_properties_count(that);
    int length = strlen(prefix);
    int i = 0;
    for (i = 0; i < count; i++) {
        char *name = mlt_properties_get_name(that, i);
        if (!strncmp(name, prefix, length)) {
            char *value = mlt_properties_get_value(that, i);
            if (value != NULL)
                mlt_properties_set_string(self, name, value);
        }
    }
    return 0;
}

/** Pass all serializable properties that match a prefix to another properties object
 *
 * \warning The prefix is stripped from the name when it is set on the \p self properties list!
 * For example a property named "foo.bar" will match prefix "foo.", but the property
 * will be named simply "bar" on the receiving properties object.
 * \public \memberof mlt_properties_s
 * \param self the properties to copy to
 * \param that The properties to copy from
 * \param prefix the property names to match (required)
 * \return true if error
 */

int mlt_properties_pass(mlt_properties self, mlt_properties that, const char *prefix)
{
    if (!self || !that)
        return 1;
    int count = mlt_properties_count(that);
    int length = strlen(prefix);
    int i = 0;
    for (i = 0; i < count; i++) {
        char *name = mlt_properties_get_name(that, i);
        if (!strncmp(name, prefix, length)) {
            char *value = mlt_properties_get_value(that, i);
            if (value != NULL)
                mlt_properties_set_string(self, name + length, value);
        }
    }
    return 0;
}

/** Locate a property by name.
 *
 * \private \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to lookup by name
 * \return the property or NULL for failure
 */

static inline mlt_property mlt_properties_find(mlt_properties self, const char *name)
{
    if (!self || !name)
        return NULL;
    property_list *list = self->local;
    mlt_property value = NULL;
    int key = generate_hash(name);

    mlt_properties_lock(self);

    int i = list->hash[key] - 1;
    if (i >= 0) {
        // Check if we're hashed
        if (list->count > 0 && list->name[i] && !strcmp(list->name[i], name))
            value = list->value[i];

        // Locate the item
        for (i = list->count - 1; value == NULL && i >= 0; i--)
            if (list->name[i] && !strcmp(list->name[i], name))
                value = list->value[i];
    }
    mlt_properties_unlock(self);

    return value;
}

/** Add a new property.
 *
 * \private \memberof mlt_properties_s
 * \param self a properties list
 * \param name the name of the new property
 * \return the new property
 */

static mlt_property mlt_properties_add(mlt_properties self, const char *name)
{
    property_list *list = self->local;
    int key = generate_hash(name);
    mlt_property result;

    mlt_properties_lock(self);

    // Check that we have space and resize if necessary
    if (list->count == list->size) {
        list->size += 50;
        list->name = realloc(list->name, list->size * sizeof(const char *));
        list->value = realloc(list->value, list->size * sizeof(mlt_property));
    }

    // Assign name/value pair
    list->name[list->count] = strdup(name);
    list->value[list->count] = mlt_property_init();

    // Assign to hash table
    if (list->hash[key] == 0)
        list->hash[key] = list->count + 1;

    // Return and increment count accordingly
    result = list->value[list->count++];

    mlt_properties_unlock(self);

    return result;
}

/** Fetch a property by name and add one if not found.
 *
 * \private \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to lookup or add
 * \return the property
 */

static mlt_property mlt_properties_fetch(mlt_properties self, const char *name)
{
    // Try to find an existing property first
    mlt_property property = mlt_properties_find(self, name);

    // If it wasn't found, create one
    if (property == NULL)
        property = mlt_properties_add(self, name);

    // Return the property
    return property;
}

static void fire_property_changed(mlt_properties self, const char *name)
{
    mlt_events_fire(self, "property-changed", mlt_event_data_from_string(name));
}

/** Copy a property to another properties list.
 *
 * \public \memberof mlt_properties_s
 * \author Zach <zachary.drew@gmail.com>
 * \param self the properties to copy to
 * \param that the properties to copy from
 * \param name the name of the property to copy
 */

void mlt_properties_pass_property(mlt_properties self, mlt_properties that, const char *name)
{
    // Make sure the source property isn't null.
    mlt_property that_prop = mlt_properties_find(that, name);
    if (that_prop == NULL)
        return;

    mlt_property_pass(mlt_properties_fetch(self, name), that_prop);
    fire_property_changed(self, name);
}

/** Copy all properties specified in a comma-separated list to another properties list.
 *
 * White space is also a delimiter.
 * \public \memberof mlt_properties_s
 * \author Zach <zachary.drew@gmail.com>
 * \param self the properties to copy to
 * \param that the properties to copy from
 * \param list a delimited list of property names
 * \return true if error
 */

int mlt_properties_pass_list(mlt_properties self, mlt_properties that, const char *list)
{
    if (!self || !that || !list)
        return 1;
    char *props = strdup(list);
    char *ptr = props;
    const char *delim = " ,\t\n"; // Any combination of spaces, commas, tabs, and newlines
    int count, done = 0;

    while (!done) {
        count = strcspn(ptr, delim);

        if (ptr[count] == '\0')
            done = 1;
        else
            ptr[count] = '\0'; // Make it a real string

        mlt_properties_pass_property(self, that, ptr);

        ptr += count + 1;
        if (!done)
            ptr += strspn(ptr, delim);
    }

    free(props);

    return 0;
}

static int is_valid_expression(mlt_properties self, const char *value)
{
    int result = *value != '\0';
    char id[255];

    while (*value != '\0') {
        size_t length = strcspn(value, "+-*/");

        // Get the identifier
        length = MIN(sizeof(id) - 1, length);
        strncpy(id, value, length);
        id[length] = '\0';
        value += length;

        // Determine if the property exists
        if (!isdigit(id[0]) && !mlt_properties_get(self, id)) {
            result = 0;
            break;
        }

        // Get the next op
        if (value[0] != '\0')
            ++value;
    }
    return result;
}

/** Set a property to a string.
 *
 * The property name "properties" is reserved to load the preset in \p value.
 * When the value begins with '@' then it is interpreted as a very simple math
 * expression containing only the +, -, *, and / operators.
 * The event "property-changed" is fired after the property has been set.
 *
 * This makes a copy of the string value you supply.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to set
 * \param value the property's new value
 * \return true if error
 */

int mlt_properties_set(mlt_properties self, const char *name, const char *value)
{
    int error = 1;

    if (!self || !name)
        return error;

    // Fetch the property to work with
    mlt_property property = mlt_properties_fetch(self, name);

    // Set it if not NULL
    if (property == NULL) {
        mlt_log(NULL, MLT_LOG_FATAL, "Whoops - %s not found (should never occur)\n", name);
    } else if (value == NULL) {
        error = mlt_property_set_string(property, value);
        mlt_properties_do_mirror(self, name);
    } else if (value[0] == '@' && is_valid_expression(self, &value[1])) {
        double total = 0;
        double current = 0;
        char id[255];
        char op = '+';

        value++;

        while (*value != '\0') {
            size_t length = strcspn(value, "+-*/");

            // Get the identifier
            length = MIN(sizeof(id) - 1, length);
            strncpy(id, value, length);
            id[length] = '\0';
            value += length;

            // Determine the value
            if (isdigit(id[0])) {
#if defined(__GLIBC__) || defined(__APPLE__) || HAVE_STRTOD_L && !defined(__OpenBSD__)
                property_list *list = self->local;
                if (list->locale)
                    current = strtod_l(id, NULL, list->locale);
                else
#endif
                    current = strtod(id, NULL);
            } else {
                current = mlt_properties_get_double(self, id);
            }

            // Apply the operation
            switch (op) {
            case '+':
                total += current;
                break;
            case '-':
                total -= current;
                break;
            case '*':
                total *= current;
                break;
            case '/':
                total = total / current;
                break;
            }

            // Get the next op
            op = *value != '\0' ? *value++ : ' ';
        }

        error = mlt_property_set_double(property, total);
        mlt_properties_do_mirror(self, name);
    } else {
        error = mlt_property_set_string(property, value);
        mlt_properties_do_mirror(self, name);
        if (!strcmp(name, "properties"))
            mlt_properties_preset(self, value);
    }

    fire_property_changed(self, name);

    return error;
}

/** Set or default a property to a string.
 *
 * This makes a copy of the string value you supply.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to set
 * \param value the string value to set or NULL to use the default
 * \param def the default string if value is NULL
 * \return true if error
 */

int mlt_properties_set_or_default(mlt_properties self,
                                  const char *name,
                                  const char *value,
                                  const char *def)
{
    return mlt_properties_set(self, name, value == NULL ? def : value);
}

/** Set a property to a string.
 *
 * Unlike \mlt_properties_set this function does not attempt to interpret an expression.
 * The property name "properties" is reserved to load the preset in \p value.
 * The event "property-changed" is fired after the property has been set.
 *
 * This makes a copy of the string value you supply.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to set
 * \param value the property's new value
 * \return true if error
 */

int mlt_properties_set_string(mlt_properties self, const char *name, const char *value)
{
    int error = 1;

    if (!self || !name)
        return error;

    // Fetch the property to work with
    mlt_property property = mlt_properties_fetch(self, name);

    // Set it if not NULL
    if (property == NULL) {
        mlt_log(NULL, MLT_LOG_FATAL, "Whoops - %s not found (should never occur)\n", name);
    } else if (value == NULL) {
        error = mlt_property_set_string(property, value);
        mlt_properties_do_mirror(self, name);
    } else {
        error = mlt_property_set_string(property, value);
        mlt_properties_do_mirror(self, name);
        if (!strcmp(name, "properties"))
            mlt_properties_preset(self, value);
    }

    fire_property_changed(self, name);

    return error;
}

/** Get a string value by name.
 *
 * Do not free the returned string. It's lifetime is controlled by the property
 * and this properties object.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \return the property's string value or NULL if it does not exist
 */

char *mlt_properties_get(mlt_properties self, const char *name)
{
    char *result = NULL;
    mlt_property value = mlt_properties_find(self, name);
    if (value) {
        property_list *list = self->local;
        result = mlt_property_get_string_l(value, list->locale);
    }
    return result;
}

/** Get a property name by index.
 *
 * Do not free the returned string.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param index the numeric index of the property
 * \return the name of the property or NULL if index is out of range
 */

char *mlt_properties_get_name(mlt_properties self, int index)
{
    if (!self)
        return NULL;
    property_list *list = self->local;
    if (index >= 0 && index < list->count)
        return list->name[index];
    return NULL;
}

/** Get a property's string value by index (with time format).
 *
 * Do not free the returned string.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param index the numeric index of the property
 * \param time_format the time format to use for animation
 * \return the property value as a string or NULL if the index is out of range
 */

char *mlt_properties_get_value_tf(mlt_properties self, int index, mlt_time_format time_format)
{
    if (!self)
        return NULL;
    property_list *list = self->local;
    if (index >= 0 && index < list->count)
        return mlt_property_get_string_l_tf(list->value[index], list->locale, time_format);
    return NULL;
}

/** Get a property's string value by index.
 *
 * Do not free the returned string.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param index the numeric index of the property
 * \return the property value as a string or NULL if the index is out of range
 */

char *mlt_properties_get_value(mlt_properties self, int index)
{
    return mlt_properties_get_value_tf(self, index, mlt_time_frames);
}

/** Get a data value by index.
 *
 * Do not free the returned pointer if you supplied a destructor function when you
 * set this property.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param index the numeric index of the property
 * \param[out] size the size of the binary data in bytes or NULL if the index is out of range
 */

void *mlt_properties_get_data_at(mlt_properties self, int index, int *size)
{
    if (!self)
        return NULL;
    property_list *list = self->local;
    if (index >= 0 && index < list->count)
        return mlt_property_get_data(list->value[index], size);
    return NULL;
}

/** Return the number of items in the list.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \return the number of property objects or -1 if error
 */

int mlt_properties_count(mlt_properties self)
{
    if (!self)
        return -1;
    property_list *list = self->local;
    return list->count;
}

/** Set a value by parsing a name=value string.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param namevalue a string containing name and value delimited by '='
 * \return true if there was an error
 */

int mlt_properties_parse(mlt_properties self, const char *namevalue)
{
    if (!self)
        return 1;
    char *name = strdup(namevalue);
    char *value = NULL;
    int error = 0;
    char *ptr = strchr(name, '=');

    if (ptr) {
        *(ptr++) = '\0';

        if (*ptr != '\"') {
            value = strdup(ptr);
        } else {
            ptr++;
            value = strdup(ptr);
            if (value != NULL && value[strlen(value) - 1] == '\"')
                value[strlen(value) - 1] = '\0';
        }
    } else {
        value = strdup("");
    }

    error = mlt_properties_set(self, name, value);

    free(name);
    free(value);

    return error;
}

/** Get an integer associated to the name.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \return The integer value, 0 if not found (which may also be a legitimate value)
 */

int mlt_properties_get_int(mlt_properties self, const char *name)
{
    int result = 0;
    mlt_property value = mlt_properties_find(self, name);
    if (value) {
        mlt_profile profile = mlt_properties_get_data(self, "_profile", NULL);
        double fps = mlt_profile_fps(profile);
        property_list *list = self->local;
        result = mlt_property_get_int(value, fps, list->locale);
    }
    return result;
}

/** Set a property to an integer value.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to set
 * \param value the integer
 * \return true if error
 */

int mlt_properties_set_int(mlt_properties self, const char *name, int value)
{
    int error = 1;

    if (!self || !name)
        return error;

    // Fetch the property to work with
    mlt_property property = mlt_properties_fetch(self, name);

    // Set it if not NULL
    if (property != NULL) {
        error = mlt_property_set_int(property, value);
        mlt_properties_do_mirror(self, name);
    }

    fire_property_changed(self, name);

    return error;
}

/** Get a 64-bit integer associated to the name.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \return the integer value, 0 if not found (which may also be a legitimate value)
 */

int64_t mlt_properties_get_int64(mlt_properties self, const char *name)
{
    mlt_property value = mlt_properties_find(self, name);
    return value == NULL ? 0 : mlt_property_get_int64(value);
}

/** Set a property to a 64-bit integer value.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to set
 * \param value the integer
 * \return true if error
 */

int mlt_properties_set_int64(mlt_properties self, const char *name, int64_t value)
{
    int error = 1;

    if (!self || !name)
        return error;

    // Fetch the property to work with
    mlt_property property = mlt_properties_fetch(self, name);

    // Set it if not NULL
    if (property != NULL) {
        error = mlt_property_set_int64(property, value);
        mlt_properties_do_mirror(self, name);
    }

    fire_property_changed(self, name);

    return error;
}

/** Get a floating point value associated to the name.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \return the floating point, 0 if not found (which may also be a legitimate value)
 */

double mlt_properties_get_double(mlt_properties self, const char *name)
{
    double result = 0;
    mlt_property value = mlt_properties_find(self, name);
    if (value) {
        mlt_profile profile = mlt_properties_get_data(self, "_profile", NULL);
        double fps = mlt_profile_fps(profile);
        property_list *list = self->local;
        result = mlt_property_get_double(value, fps, list->locale);
    }
    return result;
}

/** Set a property to a floating point value.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to set
 * \param value the floating point value
 * \return true if error
 */

int mlt_properties_set_double(mlt_properties self, const char *name, double value)
{
    int error = 1;

    if (!self || !name)
        return error;

    // Fetch the property to work with
    mlt_property property = mlt_properties_fetch(self, name);

    // Set it if not NULL
    if (property != NULL) {
        error = mlt_property_set_double(property, value);
        mlt_properties_do_mirror(self, name);
    }

    fire_property_changed(self, name);

    return error;
}

/** Get a position value associated to the name.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \return the position, 0 if not found (which may also be a legitimate value)
 */

mlt_position mlt_properties_get_position(mlt_properties self, const char *name)
{
    mlt_position result = 0;
    mlt_property value = mlt_properties_find(self, name);
    if (value) {
        mlt_profile profile = mlt_properties_get_data(self, "_profile", NULL);
        double fps = mlt_profile_fps(profile);
        property_list *list = self->local;
        result = mlt_property_get_position(value, fps, list->locale);
    }
    return result;
}

/** Set a property to a position value.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \param value the position
 * \return true if error
 */

int mlt_properties_set_position(mlt_properties self, const char *name, mlt_position value)
{
    int error = 1;

    if (!self || !name)
        return error;

    // Fetch the property to work with
    mlt_property property = mlt_properties_fetch(self, name);

    // Set it if not NULL
    if (property != NULL) {
        error = mlt_property_set_position(property, value);
        mlt_properties_do_mirror(self, name);
    }

    fire_property_changed(self, name);

    return error;
}

/** Get a binary data value associated to the name.
 *
 * Do not free the returned pointer if you supplied a destructor function
 * when you set this property.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \param[out] length The size of the binary data in bytes, if available (often it is not, you should know)
 */

void *mlt_properties_get_data(mlt_properties self, const char *name, int *length)
{
    mlt_property value = mlt_properties_find(self, name);
    return value == NULL ? NULL : mlt_property_get_data(value, length);
}

/** Store binary data as a property.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to set
 * \param value an opaque pointer to binary data
 * \param length the size of the binary data in bytes (optional)
 * \param destroy a function to deallocate the binary data when the property is closed (optional)
 * \param serialise a function that can serialize the binary data as text (optional)
 * \return true if error
 */

int mlt_properties_set_data(mlt_properties self,
                            const char *name,
                            void *value,
                            int length,
                            mlt_destructor destroy,
                            mlt_serialiser serialise)
{
    int error = 1;

    if (!self || !name)
        return error;

    // Fetch the property to work with
    mlt_property property = mlt_properties_fetch(self, name);

    // Set it if not NULL
    if (property != NULL)
        error = mlt_property_set_data(property, value, length, destroy, serialise);

    fire_property_changed(self, name);

    return error;
}

/** Rename a property.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param source the property to rename
 * \param dest the new name
 * \return true if the name is already in use
 */

int mlt_properties_rename(mlt_properties self, const char *source, const char *dest)
{
    mlt_property value = mlt_properties_find(self, dest);

    if (value == NULL) {
        property_list *list = self->local;
        int i = 0;

        // Locate the item
        mlt_properties_lock(self);
        for (i = 0; i < list->count; i++) {
            if (list->name[i] && !strcmp(list->name[i], source)) {
                free(list->name[i]);
                list->name[i] = strdup(dest);
                list->hash[generate_hash(dest)] = i + 1;
                break;
            }
        }
        mlt_properties_unlock(self);
    }

    return value != NULL;
}

/** Dump the properties to a file handle.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param output a file handle
 */

void mlt_properties_dump(mlt_properties self, FILE *output)
{
    if (!self || !output)
        return;
    property_list *list = self->local;
    int i = 0;
    for (i = 0; i < list->count; i++)
        if (mlt_properties_get(self, list->name[i]) != NULL)
            fprintf(output, "%s=%s\n", list->name[i], mlt_properties_get(self, list->name[i]));
}

/** Output the properties to a file handle.
 *
 * This version includes reference counts and does not put each property on a new line.
 * \public \memberof mlt_properties_s
 * \param self a properties pointer
 * \param title a string to preface the output
 * \param output a file handle
 */
void mlt_properties_debug(mlt_properties self, const char *title, FILE *output)
{
    if (!self || !output)
        return;
    if (output == NULL)
        output = stderr;
    fprintf(output, "%s: ", title);
    if (self != NULL) {
        property_list *list = self->local;
        int i = 0;
        fprintf(output, "[ ref=%d", list->ref_count);
        for (i = 0; i < list->count; i++)
            if (mlt_properties_get(self, list->name[i]) != NULL)
                fprintf(output, ", %s=%s", list->name[i], mlt_properties_get(self, list->name[i]));
            else if (mlt_properties_get_data(self, list->name[i], NULL) != NULL)
                fprintf(output,
                        ", %s=%p",
                        list->name[i],
                        mlt_properties_get_data(self, list->name[i], NULL));
            else
                fprintf(output,
                        ", %s=%p",
                        list->name[i],
                        mlt_properties_get_properties(self, list->name[i]));
        fprintf(output, " ]");
    }
    fprintf(output, "\n");
}

/** Save the properties to a file by name.
 *
 * This uses the dump format - one line per property.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param filename the name of a file to create or overwrite
 * \return true if there was an error
 */

int mlt_properties_save(mlt_properties self, const char *filename)
{
    int error = 1;
    if (!self || !filename)
        return error;

    FILE *f = mlt_fopen(filename, "w");
    if (f != NULL) {
        mlt_properties_dump(self, f);
        fclose(f);
        error = 0;
    }
    return error;
}

/* This is a very basic cross platform fnmatch replacement - it will fail in
 * many cases, but for the basic *.XXX and YYY*.XXX, it will work ok.
 */

/** Test whether a filename or pathname matches a shell-style pattern.
 *
 * \private \memberof mlt_properties_s
 * \param wild a string containing a wildcard pattern
 * \param file the name of a file to test against
 * \return true if the file name matches the wildcard pattern
 */

static int mlt_fnmatch(const char *wild, const char *file)
{
    int f = 0;
    int w = 0;

    while (f < strlen(file) && w < strlen(wild)) {
        if (wild[w] == '*') {
            w++;
            if (w == strlen(wild))
                f = strlen(file);
            while (f != strlen(file) && tolower(file[f]) != tolower(wild[w]))
                f++;
        } else if (wild[w] == '?' || tolower(file[f]) == tolower(wild[w])) {
            f++;
            w++;
        } else if (wild[0] == '*') {
            w = 0;
        } else {
            return 0;
        }
    }

    return strlen(file) == f && strlen(wild) == w;
}

/** Compare the string or serialized value of two properties.
 *
 * \private \memberof mlt_properties_s
 * \param self a property
 * \param that a property
 * \return < 0 if \p self less than \p that, 0 if equal, or > 0 if \p self is greater than \p that
 */

static int mlt_compare(const void *self, const void *that)
{
    return strcmp(mlt_property_get_string(*(const mlt_property *) self),
                  mlt_property_get_string(*(const mlt_property *) that));
}

/** Get the contents of a directory.
 *
 * Obtains an optionally sorted list of the files found in a directory with a specific wild card.
 * Entries in the list have a numeric name (running from 0 to count - 1). Only values change
 * position if sort is enabled. Designed to be posix compatible (linux, os/x, mingw etc).
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param dirname the name of the directory
 * \param pattern a wildcard pattern to filter the directory listing
 * \param sort Do you want to sort the directory listing?
 * \return the number of items in the directory listing
 */

int mlt_properties_dir_list(mlt_properties self, const char *dirname, const char *pattern, int sort)
{
    DIR *dir = opendir(dirname);

    if (dir) {
        char key[20];
        struct dirent *de = readdir(dir);
        char fullname[1024];
        while (de != NULL) {
            sprintf(key, "%d", mlt_properties_count(self));
            snprintf(fullname, 1024, "%s/%s", dirname, de->d_name);
            if (pattern == NULL)
                mlt_properties_set_string(self, key, fullname);
            else if (de->d_name[0] != '.' && mlt_fnmatch(pattern, de->d_name))
                mlt_properties_set_string(self, key, fullname);
            de = readdir(dir);
        }

        closedir(dir);
    }

    if (sort && mlt_properties_count(self)) {
        property_list *list = self->local;
        mlt_properties_lock(self);
        qsort(list->value, mlt_properties_count(self), sizeof(mlt_property), mlt_compare);
        mlt_properties_unlock(self);
    }

    return mlt_properties_count(self);
}

/** Close a properties object.
 *
 * Deallocates the properties object and everything it contains.
 * \public \memberof mlt_properties_s
 * \param self a properties object
 */

void mlt_properties_close(mlt_properties self)
{
    if (self != NULL && mlt_properties_dec_ref(self) <= 0) {
        if (self->close != NULL) {
            self->close(self->close_object);
        } else {
            property_list *list = self->local;
            int index = 0;

#if _MLT_PROPERTY_CHECKS_ == 1
            // Show debug info
            mlt_properties_debug(self, "Closing", stderr);
#endif

#ifdef _MLT_PROPERTY_CHECKS_
            // Increment destroyed count
            properties_destroyed++;

            // Show current stats - these should match when the app is closed
            mlt_log(NULL,
                    MLT_LOG_DEBUG,
                    "Created %d, destroyed %d\n",
                    properties_created,
                    properties_destroyed);
#endif

            // Clean up names and values
            for (index = list->count - 1; index >= 0; index--) {
                mlt_property_close(list->value[index]);
                free(list->name[index]);
            }

#if defined(__GLIBC__) || defined(__APPLE__)
            // Cleanup locale
            if (list->locale)
                freelocale(list->locale);
#else

            free(list->locale);
#endif

            // Clear up the list
            pthread_mutex_destroy(&list->mutex);
            free(list->name);
            free(list->value);
            free(list);

            // Free self now if self has no child
            if (self->child == NULL)
                free(self);
        }
    }
}

/** Determine if the properties list is really just a sequence or ordered list.
 *
 * \public \memberof mlt_properties_s
 * \param properties a properties list
 * \return true if all of the property names are numeric (a sequence)
 */

int mlt_properties_is_sequence(mlt_properties properties)
{
    int i;
    int n = mlt_properties_count(properties);
    for (i = 0; i < n; i++)
        if (!isdigit(mlt_properties_get_name(properties, i)[0]))
            return 0;
    return 1;
}

/** \brief YAML Tiny Parser context structure
 *
 * YAML is a nifty text format popular in the Ruby world as a cleaner,
 * less verbose alternative to XML. See this Wikipedia topic for an overview:
 * http://en.wikipedia.org/wiki/YAML
 * The YAML specification is at:
 * http://yaml.org/
 * YAML::Tiny is a Perl module that specifies a subset of YAML that we are
 * using here (for the same reasons):
 * http://search.cpan.org/~adamk/YAML-Tiny-1.25/lib/YAML/Tiny.pm
 * \private
 */

struct yaml_parser_context
{
    mlt_deque stack;
    unsigned int level;
    int index;
    mlt_deque index_stack;
    char block;
    char *block_name;
    unsigned int block_indent;
};
typedef struct yaml_parser_context *yaml_parser;

/** Remove spaces from the left side of a string.
 *
 * \param s the string to trim
 * \return the number of characters removed
 */

static unsigned int ltrim(char **s)
{
    unsigned int i = 0;
    char *c = *s;
    int n = strlen(c);
    for (i = 0; i < n && *c == ' '; i++, c++)
        ;
    *s = c;
    return i;
}

/** Remove spaces from the right side of a string.
 *
 * \param s the string to trim
 * \return the number of characters removed
 */

static unsigned int rtrim(char *s)
{
    int n = strlen(s);
    int i;
    for (i = n; i > 0 && s[i - 1] == ' '; --i)
        s[i - 1] = 0;
    return n - i;
}

/** Parse a line of YAML Tiny.
 *
 * Adds a property if needed.
 * \private \memberof yaml_parser_context
 * \param context a YAML Tiny Parser context
 * \param namevalue a line of YAML Tiny
 * \return true if there was an error
 */

static int parse_yaml(yaml_parser context, const char *namevalue)
{
    char *name_ = strdup(namevalue);
    char *name = name_;
    char *value = NULL;
    int error = 0;
    char *ptr = strchr(name, ':');
    unsigned int indent = ltrim(&name);
    mlt_properties properties = mlt_deque_peek_back(context->stack);

    // If name is quoted
    if (ptr && name[0] == '\"') {
        // Look for ending quote.
        ptr = strchr(ptr + 1, '\"');
        if (ptr)
            // Locate delimiter after ending quote.
            ptr = strchr(ptr + 1, ':');
        else
            // No ending quote!
            ptr = strchr(name, ':');
    }

    // Ascending one more levels in the tree
    if (indent < context->level) {
        unsigned int i;
        unsigned int n = (context->level - indent) / 2;
        for (i = 0; i < n; i++) {
            mlt_deque_pop_back(context->stack);
            context->index = mlt_deque_pop_back_int(context->index_stack);
        }
        properties = mlt_deque_peek_back(context->stack);
        context->level = indent;
    }

    // Descending a level in the tree
    else if (indent > context->level && context->block == 0) {
        context->level = indent;
    }

    // If there is a colon that is not part of a block
    if (ptr && (indent == context->level)) {
        // Reset block processing
        if (context->block_name) {
            free(context->block_name);
            context->block_name = NULL;
            context->block = 0;
        }

        // Terminate the name and setup the value pointer
        *(ptr++) = 0;

        // Trim comment
        char *comment = strchr(ptr, '#');
        if (comment) {
            const char *quote = strchr(ptr, '\"');
            if (!quote || quote > comment)
                *comment = 0;
        }

        // Trim leading and trailing spaces from bare value
        ltrim(&ptr);
        rtrim(ptr);

        // No value means a child
        if (strcmp(ptr, "") == 0) {
            mlt_properties child = mlt_properties_new();
            mlt_properties_set_lcnumeric(child, mlt_properties_get_lcnumeric(properties));
            mlt_properties_set_data(properties,
                                    name,
                                    child,
                                    0,
                                    (mlt_destructor) mlt_properties_close,
                                    NULL);
            mlt_deque_push_back(context->stack, child);
            mlt_deque_push_back_int(context->index_stack, context->index);
            context->index = 0;
            free(name_);
            return error;
        }

        // A dash indicates a sequence item
        if (name[0] == '-') {
            mlt_properties child = mlt_properties_new();
            char key[20];

            mlt_properties_set_lcnumeric(child, mlt_properties_get_lcnumeric(properties));
            snprintf(key, sizeof(key), "%d", context->index++);
            mlt_properties_set_data(properties,
                                    key,
                                    child,
                                    0,
                                    (mlt_destructor) mlt_properties_close,
                                    NULL);
            mlt_deque_push_back(context->stack, child);
            mlt_deque_push_back_int(context->index_stack, context->index);

            name++;
            context->level += ltrim(&name) + 1;
            properties = child;
        }

        // Value is quoted
        if (*ptr == '\"') {
            ptr++;
            value = strdup(ptr);
            if (value && value[strlen(value) - 1] == '\"')
                value[strlen(value) - 1] = 0;
        }

        // Value is folded or unfolded block
        else if (*ptr == '|' || *ptr == '>') {
            context->block = *ptr;
            context->block_name = strdup(name);
            context->block_indent = 0;
            value = strdup("");
        }

        // Bare value
        else {
            value = strdup(ptr);
        }
    }

    // A list of scalars
    else if (name[0] == '-') {
        // Reset block processing
        if (context->block_name) {
            free(context->block_name);
            context->block_name = NULL;
            context->block = 0;
        }

        char key[20];

        snprintf(key, sizeof(key), "%d", context->index++);
        ptr = name + 1;

        // Trim comment
        char *comment = strchr(ptr, '#');
        if (comment) {
            const char *quote = strchr(ptr, '\"');
            if (!quote || quote > comment)
                *comment = 0;
        }

        // Trim leading and trailing spaces from bare value
        ltrim(&ptr);
        rtrim(ptr);

        // Value is quoted
        if (*ptr == '\"') {
            ptr++;
            value = strdup(ptr);
            if (value && value[strlen(value) - 1] == '\"')
                value[strlen(value) - 1] = 0;
        }

        // Value is folded or unfolded block
        else if (*ptr == '|' || *ptr == '>') {
            context->block = *ptr;
            context->block_name = strdup(key);
            context->block_indent = 0;
            value = strdup("");
        }

        // Bare value
        else {
            value = strdup(ptr);
        }

        free(name_);
        name = name_ = strdup(key);
    }

    // Non-folded block
    else if (context->block == '|') {
        if (context->block_indent == 0)
            context->block_indent = indent;
        if (indent > context->block_indent)
            name = &name_[context->block_indent];
        rtrim(name);
        char *old_value = mlt_properties_get(properties, context->block_name);
        value = calloc(1, strlen(old_value) + strlen(name) + 2);
        strcpy(value, old_value);
        if (strcmp(old_value, ""))
            strcat(value, "\n");
        strcat(value, name);
        name = context->block_name;
    }

    // Folded block
    else if (context->block == '>') {
        ltrim(&name);
        rtrim(name);
        char *old_value = mlt_properties_get(properties, context->block_name);

        // Blank line (prepended with spaces) is new line
        if (strcmp(name, "") == 0) {
            value = calloc(1, strlen(old_value) + 2);
            strcat(value, old_value);
            strcat(value, "\n");
        }
        // Concatenate with space
        else {
            value = calloc(1, strlen(old_value) + strlen(name) + 2);
            strcat(value, old_value);
            if (strcmp(old_value, "") && old_value[strlen(old_value) - 1] != '\n')
                strcat(value, " ");
            strcat(value, name);
        }
        name = context->block_name;
    }

    else {
        value = strdup("");
    }

    // Remove quotes around the name.
    if (name && name[0] == '"' && name[strlen(name) - 1] == '"') {
        name++;
        name[strlen(name) - 1] = '\0';
    }

    error = mlt_properties_set_string(properties, name, value);

    if (!strcmp(name, "LC_NUMERIC"))
        mlt_properties_set_lcnumeric(properties, value);

    free(name_);
    free(value);

    return error;
}

/** Parse a YAML Tiny file by name.
 *
 * \public \memberof mlt_properties_s
 * \param filename the name of a text file containing YAML Tiny
 * \return a new properties list
 */

mlt_properties mlt_properties_parse_yaml(const char *filename)
{
    // Construct a standalone properties object
    mlt_properties self = mlt_properties_new();

    if (self) {
        // Open the file
        FILE *file = mlt_fopen(filename, "r");

        // Load contents of file
        if (file) {
            // Temp string
            char temp[MAX_LOAD_LINE_SIZE];
            char *ptemp = &temp[0];

            // Default to LC_NUMERIC = C
            mlt_properties_set_lcnumeric(self, "C");

            // Parser context
            yaml_parser context = calloc(1, sizeof(struct yaml_parser_context));
            context->stack = mlt_deque_init();
            context->index_stack = mlt_deque_init();
            mlt_deque_push_back(context->stack, self);
            mlt_deque_push_back_int(context->index_stack, 0);

            // Read each string from the file
            while (fgets(temp, MAX_LOAD_LINE_SIZE, file)) {
                // Check for end-of-stream
                if (strncmp(ptemp, "...", 3) == 0)
                    break;

                // Chomp the string
                temp[strlen(temp) - 1] = '\0';

                // Skip blank lines, comment lines, and document separator
                if (strcmp(ptemp, "") && ptemp[0] != '#' && strncmp(ptemp, "---", 3)
                    && strncmp(ptemp, "%YAML", 5) && strncmp(ptemp, "% YAML", 6))
                    parse_yaml(context, temp);
            }

            // Close the file
            fclose(file);
            mlt_deque_close(context->stack);
            mlt_deque_close(context->index_stack);
            free(context->block_name);
            free(context);
        }
    }

    // Return the pointer
    return self;
}

/*
 * YAML Tiny Serializer
 */

/** How many bytes to grow at a time */
#define STRBUF_GROWTH (1024)

/** \brief Private to mlt_properties_s, a self-growing buffer for building strings
 * \private
 */

struct strbuf_s
{
    size_t size;
    char *string;
};

typedef struct strbuf_s *strbuf;

/** Create a new string buffer
 *
 * \private \memberof strbuf_s
 * \return a new string buffer
 */

static strbuf strbuf_new()
{
    strbuf buffer = calloc(1, sizeof(struct strbuf_s));
    buffer->size = STRBUF_GROWTH;
    buffer->string = calloc(1, buffer->size);
    return buffer;
}

/** Destroy a string buffer
 *
 * \private \memberof strbuf_s
 * \param buffer the string buffer to close
 */

static void strbuf_close(strbuf buffer)
{
    // We do not free buffer->string; strbuf user must save that pointer
    // and free it.
    free(buffer);
}

/** Format a string into a string buffer
 *
 * A variable number of arguments follows the format string - one for each
 * format specifier.
 * \private \memberof strbuf_s
 * \param buffer the string buffer to write into
 * \param format a string that contains text and formatting instructions
 * \return the formatted string
 */

static char *strbuf_printf(strbuf buffer, const char *format, ...)
{
    while (buffer->string) {
        va_list ap;
        va_start(ap, format);
        size_t len = strlen(buffer->string);
        size_t remain = buffer->size - len - 1;
        int need = vsnprintf(buffer->string + len, remain, format, ap);
        va_end(ap);
        if (need > -1 && need < remain)
            break;
        buffer->string[len] = 0;
        buffer->size += need + STRBUF_GROWTH;
        buffer->string = realloc(buffer->string, buffer->size);
    }
    return buffer->string;
}

/** Indent a line of YAML Tiny.
 *
 * \private \memberof strbuf_s
 * \param output a string buffer
 * \param indent the number of spaces to indent
 */

static inline void indent_yaml(strbuf output, int indent)
{
    int j;
    for (j = 0; j < indent; j++)
        strbuf_printf(output, " ");
}

static void strbuf_escape(strbuf output, const char *value, char c)
{
    char *v = strdup(value);
    char *s = v;
    char *found = strchr(s, c);

    while (found) {
        *found = '\0';
        strbuf_printf(output, "%s\\%c", s, c);
        s = found + 1;
        found = strchr(s, c);
    }
    strbuf_printf(output, "%s", s);
    free(v);
}

static inline int has_reserved_char(const char *string)
{
    return strchr(string, ':') || strchr(string, '[') || strchr(string, '\'')
           || strchr(string, '#');
}

/** Convert a line string into a YAML block literal.
 *
 * \private \memberof strbuf_s
 * \param output a string buffer
 * \param value the string to format as a block literal
 * \param indent the number of spaces to indent
 */

static void output_yaml_block_literal(strbuf output, const char *value, int indent)
{
    char *v = strdup(value);
    char *sol = v;
    char *eol = strchr(sol, '\n');

    while (eol) {
        indent_yaml(output, indent);
        *eol = '\0';
        strbuf_printf(output, "%s\n", sol);
        sol = eol + 1;
        eol = strchr(sol, '\n');
    }
    indent_yaml(output, indent);
    strbuf_printf(output, "%s\n", sol);
    free(v);
}

/** Recursively serialize a properties list into a string buffer as YAML Tiny.
 *
 * \private \memberof mlt_properties_s
 * \param self a properties list
 * \param output a string buffer to hold the serialized YAML Tiny
 * \param indent the number of spaces to indent (for recursion, initialize to 0)
 * \param is_parent_sequence Is this properties list really just a sequence (for recursion, initialize to 0)?
 */

static void serialise_yaml(mlt_properties self, strbuf output, int indent, int is_parent_sequence)
{
    property_list *list = self->local;
    int i = 0;
    int is_sequence = mlt_properties_is_sequence(self);

    for (i = 0; i < list->count; i++) {
        // This implementation assumes that all data elements are property lists.
        // Unfortunately, we do not have run time type identification.
        mlt_properties child = mlt_property_get_data(list->value[i], NULL);
        const char *name = list->name[i];
        const char *value = mlt_properties_get(self, name);

        if (is_sequence) {
            // Ignore hidden/non-serialisable items
            if (name[0] != '_') {
                // Indicate a sequence item
                indent_yaml(output, indent);
                strbuf_printf(output, "- ");

                // If the value can be represented as a string
                if (value && strcmp(value, "")) {
                    // Determine if this is an unfolded block literal
                    if (strchr(value, '\n')) {
                        strbuf_printf(output, "|\n");
                        output_yaml_block_literal(output,
                                                  value,
                                                  indent + strlen(name) + strlen("|"));
                    } else if (has_reserved_char(value)) {
                        strbuf_printf(output, "\"");
                        strbuf_escape(output, value, '"');
                        strbuf_printf(output, "\"\n", value);
                    } else if (strchr(value, '"')) {
                        strbuf_printf(output, "'%s'\n", value);
                    } else {
                        strbuf_printf(output, "%s\n", value);
                    }
                }
            }
            // Recurse on child
            if (child && child->local)
                serialise_yaml(child, output, indent + 2, 1);
        } else {
            // Assume this is a normal map-oriented properties list

            // Ignore hidden/non-serialisable items
            // If the value can be represented as a string
            if (name[0] != '_' && value && strcmp(value, "")) {
                if (is_parent_sequence == 0)
                    indent_yaml(output, indent);
                else
                    is_parent_sequence = 0;

                // Output the name.
                if (has_reserved_char(name)) {
                    strbuf_printf(output, "\"");
                    strbuf_escape(output, name, '"');
                    strbuf_printf(output, "\": ");
                } else {
                    strbuf_printf(output, "%s: ", name);
                }

                // Determine if this is an unfolded block literal
                if (strchr(value, '\n')) {
                    strbuf_printf(output, "|\n");
                    output_yaml_block_literal(output, value, indent + strlen(name) + strlen(": "));
                } else if (has_reserved_char(value)) {
                    strbuf_printf(output, "\"");
                    strbuf_escape(output, value, '"');
                    strbuf_printf(output, "\"\n");
                } else if (strchr(value, '"')) {
                    strbuf_printf(output, "'%s'\n", value);
                } else {
                    strbuf_printf(output, "%s\n", value);
                }
            }

            // Output a child as a map item
            if (child && child->local) {
                indent_yaml(output, indent);

                if (has_reserved_char(name)) {
                    strbuf_printf(output, "\"");
                    strbuf_escape(output, name, '"');
                    strbuf_printf(output, "\":\n");
                } else {
                    strbuf_printf(output, "%s:\n", name);
                }

                // Recurse on child
                serialise_yaml(child, output, indent + 2, 0);
            }
        }
    }
}

/** Serialize a properties list as a string of YAML Tiny.
 *
 * The caller MUST free the returned string!
 * This operates on properties containing properties as a hierarchical data
 * structure.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \return a string containing YAML Tiny that represents the properties list
 */

char *mlt_properties_serialise_yaml(mlt_properties self)
{
    if (!self)
        return NULL;
    const char *lc_numeric = mlt_properties_get_lcnumeric(self);
    strbuf b = strbuf_new();
    strbuf_printf(b, "---\n");
    mlt_properties_set_lcnumeric(self, "C");
    serialise_yaml(self, b, 0, 0);
    mlt_properties_set_lcnumeric(self, lc_numeric);
    strbuf_printf(b, "...\n");
    char *ret = b->string;
    strbuf_close(b);
    return ret;
}

/** Protect a properties list against concurrent access.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 */

void mlt_properties_lock(mlt_properties self)
{
    if (self)
        pthread_mutex_lock(&((property_list *) (self->local))->mutex);
}

/** End protecting a properties list against concurrent access.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 */

void mlt_properties_unlock(mlt_properties self)
{
    if (self)
        pthread_mutex_unlock(&((property_list *) (self->local))->mutex);
}

/** Remove the value for a property.
 *
 * This initializes the value to zero and removes any string, data, or animation.
 * This is especially useful when you want to reset an animation.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the name of the property to clear
 */

void mlt_properties_clear(mlt_properties self, const char *name)
{
    if (!self || !name)
        return;

    // Fetch the property to work with
    mlt_property property = mlt_properties_fetch(self, name);

    // Set it if not NULL
    if (property)
        mlt_property_clear(property);

    fire_property_changed(self, name);
}

/** Check if a property exists.
 *
 * This function is not a substitute for checking for NULL as a property could
 * be set to NULL.
 *
 * This function will return false immediately after a call to
 * mlt_properties_clear() or if the property has never been created.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the name of the property to query
 * \return true if the property exists
 */

int mlt_properties_exists(mlt_properties self, const char *name)
{
    return !mlt_property_is_clear(mlt_properties_find(self, name));
}

/** Get a time string associated to the name.
 *
 * Do not free the returned string. It's lifetime is controlled by the property.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \param format the time format that you want
 * \return the property's time value or NULL if \p name does not exist or there is no profile
 */

char *mlt_properties_get_time(mlt_properties self, const char *name, mlt_time_format format)
{
    mlt_profile profile = mlt_properties_get_data(self, "_profile", NULL);
    if (profile) {
        double fps = mlt_profile_fps(profile);
        mlt_property value = mlt_properties_find(self, name);
        property_list *list = self->local;
        return value == NULL ? NULL : mlt_property_get_time(value, format, fps, list->locale);
    }
    return NULL;
}

/** Convert a frame count to a time string.
 *
 * Do not free the returned string. It's lifetime is controlled by the property.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param frames the frame count to convert
 * \param format the time format that you want
 * \return the time string or NULL if error, e.g. there is no profile
 */

char *mlt_properties_frames_to_time(mlt_properties self, mlt_position frames, mlt_time_format format)
{
    const char *name = "_mlt_properties_time";
    mlt_properties_set_position(self, name, frames);
    return mlt_properties_get_time(self, name, format);
}

/** Convert a time string to a frame count.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param time the time string to convert
 * \return a frame count or a negative value if error, e.g. there is no profile
 */

mlt_position mlt_properties_time_to_frames(mlt_properties self, const char *time)
{
    const char *name = "_mlt_properties_time";
    mlt_properties_set_string(self, name, time);
    return mlt_properties_get_position(self, name);
}

/** Set a property to an integer value by color.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to set
 * \param color the color
 * \return true if error
 */

int mlt_properties_set_color(mlt_properties self, const char *name, mlt_color color)
{
    int error = 1;

    if (!self || !name)
        return error;

    // Fetch the property to work with
    mlt_property property = mlt_properties_fetch(self, name);

    // Set it if not NULL
    if (property != NULL) {
        error = mlt_property_set_color(property, color);
        mlt_properties_do_mirror(self, name);
    }

    fire_property_changed(self, name);

    return error;
}

/** Convert a numeric property to a tuple of color components.
 *
 * If the property's string is red, green, blue, white, or black, then it
 * is converted to the corresponding opaque color tuple. Otherwise, the property
 * is fetched as an integer and then converted.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \return a color structure
 */

mlt_color mlt_properties_get_color(mlt_properties self, const char *name)
{
    mlt_property value = mlt_properties_find(self, name);
    mlt_color result = {0xff, 0xff, 0xff, 0xff};
    if (value) {
        mlt_profile profile = mlt_properties_get_data(self, "_profile", NULL);
        double fps = mlt_profile_fps(profile);
        property_list *list = self->local;
        result = mlt_property_get_color(value, fps, list->locale);
    }
    return result;
}

/** Set a property to an integer value by color at a frame position.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to set
 * \param value the color
 * \param position the frame number
 * \param length the maximum number of frames when interpreting negative keyframe times,
 *  <=0 if you don't care or need that
 * \param keyframe_type the interpolation method for this keyframe
 * \return true if error
 */

extern int mlt_properties_anim_set_color(mlt_properties self,
                                         const char *name,
                                         mlt_color value,
                                         int position,
                                         int length,
                                         mlt_keyframe_type keyframe_type)
{
    int error = 1;

    if (!self || !name)
        return error;

    // Fetch the property to work with
    mlt_property property = mlt_properties_fetch(self, name);

    // Set it if not NULL
    if (property != NULL) {
        mlt_profile profile = mlt_properties_get_data(self, "_profile", NULL);
        double fps = mlt_profile_fps(profile);
        property_list *list = self->local;
        error = mlt_property_anim_set_color(property,
                                            value,
                                            fps,
                                            list->locale,
                                            position,
                                            length,
                                            keyframe_type);
        mlt_properties_do_mirror(self, name);
    }

    fire_property_changed(self, name);

    return error;
}

/** Get a color associated to the name at a frame position.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \param position the frame number
 * \param length the maximum number of frames when interpreting negative keyframe times,
 *  <=0 if you don't care or need that
 * \return a color structure
 */

mlt_color mlt_properties_anim_get_color(mlt_properties self,
                                        const char *name,
                                        int position,
                                        int length)
{
    mlt_profile profile = mlt_properties_get_data(self, "_profile", NULL);
    double fps = mlt_profile_fps(profile);
    property_list *list = self->local;
    mlt_property value = mlt_properties_find(self, name);
    mlt_color color = {0xff, 0xff, 0xff, 0xff};
    return value == NULL ? color
                         : mlt_property_anim_get_color(value, fps, list->locale, position, length);
}

/** Get a string value by name at a frame position.
 *
 * Do not free the returned string. It's lifetime is controlled by the property
 * and this properties object.
 * Enclose a string property value in double quotation marks to prevent
 * mlt_properties_anim_get() from interpreting the string as animation. The
 * double-quotes are removed when retrieved through mlt_properties_anim_get().
 * The same rule applies to string keyframe values: to protect a keyframed-string
 * value containing a semicolon or equal sign, enclose it in double-quotes.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \param position the frame number
 * \param length the maximum number of frames when interpreting negative keyframe times,
 *  <=0 if you don't care or need that
 * \return the property's string value or NULL if it does not exist
 */

char *mlt_properties_anim_get(mlt_properties self, const char *name, int position, int length)
{
    mlt_profile profile = mlt_properties_get_data(self, "_profile", NULL);
    double fps = mlt_profile_fps(profile);
    mlt_property value = mlt_properties_find(self, name);
    property_list *list = self->local;
    return value == NULL ? NULL
                         : mlt_property_anim_get_string(value, fps, list->locale, position, length);
}

/** Set a property to a string at a frame position.
 *
 * The event "property-changed" is fired after the property has been set.
 *
 * This makes a copy of the string value you supply.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to set
 * \param value the property's new value
 * \param position the frame number
 * \param length the maximum number of frames when interpreting negative keyframe times,
 *  <=0 if you don't care or need that
 * \return true if error
 */

int mlt_properties_anim_set(
    mlt_properties self, const char *name, const char *value, int position, int length)
{
    int error = 1;

    if (!self || !name)
        return error;

    // Fetch the property to work with
    mlt_property property = mlt_properties_fetch(self, name);

    // Set it if not NULL
    if (property) {
        mlt_profile profile = mlt_properties_get_data(self, "_profile", NULL);
        double fps = mlt_profile_fps(profile);
        property_list *list = self->local;
        error = mlt_property_anim_set_string(property, value, fps, list->locale, position, length);
        mlt_properties_do_mirror(self, name);
    }

    fire_property_changed(self, name);

    return error;
}

/** Get an integer associated to the name at a frame position.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \param position the frame number
 * \param length the maximum number of frames when interpreting negative keyframe times,
 *  <=0 if you don't care or need that
 * \return the integer value, 0 if not found (which may also be a legitimate value)
 */

int mlt_properties_anim_get_int(mlt_properties self, const char *name, int position, int length)
{
    mlt_profile profile = mlt_properties_get_data(self, "_profile", NULL);
    double fps = mlt_profile_fps(profile);
    property_list *list = self->local;
    mlt_property value = mlt_properties_find(self, name);
    return value == NULL ? 0
                         : mlt_property_anim_get_int(value, fps, list->locale, position, length);
}

/** Set a property to an integer value at a frame position.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to set
 * \param value the integer
 * \param position the frame number
 * \param length the maximum number of frames when interpreting negative keyframe times,
 *  <=0 if you don't care or need that
 * \param keyframe_type the interpolation method for this keyframe
 * \return true if error
 */

int mlt_properties_anim_set_int(mlt_properties self,
                                const char *name,
                                int value,
                                int position,
                                int length,
                                mlt_keyframe_type keyframe_type)
{
    int error = 1;

    if (!self || !name)
        return error;

    // Fetch the property to work with
    mlt_property property = mlt_properties_fetch(self, name);

    // Set it if not NULL
    if (property != NULL) {
        mlt_profile profile = mlt_properties_get_data(self, "_profile", NULL);
        double fps = mlt_profile_fps(profile);
        property_list *list = self->local;
        error = mlt_property_anim_set_int(property,
                                          value,
                                          fps,
                                          list->locale,
                                          position,
                                          length,
                                          keyframe_type);
        mlt_properties_do_mirror(self, name);
    }

    fire_property_changed(self, name);

    return error;
}

/** Get a real number associated to the name at a frame position.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \param position the frame number
 * \param length the maximum number of frames when interpreting negative keyframe times,
 *  <=0 if you don't care or need that
 * \return the real number, 0 if not found (which may also be a legitimate value)
 */

double mlt_properties_anim_get_double(mlt_properties self,
                                      const char *name,
                                      int position,
                                      int length)
{
    mlt_profile profile = mlt_properties_get_data(self, "_profile", NULL);
    double fps = mlt_profile_fps(profile);
    property_list *list = self->local;
    mlt_property value = mlt_properties_find(self, name);
    return value == NULL ? 0.0
                         : mlt_property_anim_get_double(value, fps, list->locale, position, length);
}

/** Set a property to a real number at a frame position.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to set
 * \param value the real number
 * \param position the frame number
 * \param length the maximum number of frames when interpreting negative keyframe times,
 *  <=0 if you don't care or need that
 * \param keyframe_type the interpolation method for this keyframe
 * \return true if error
 */

int mlt_properties_anim_set_double(mlt_properties self,
                                   const char *name,
                                   double value,
                                   int position,
                                   int length,
                                   mlt_keyframe_type keyframe_type)
{
    int error = 1;

    if (!self || !name)
        return error;

    // Fetch the property to work with
    mlt_property property = mlt_properties_fetch(self, name);

    // Set it if not NULL
    if (property != NULL) {
        mlt_profile profile = mlt_properties_get_data(self, "_profile", NULL);
        double fps = mlt_profile_fps(profile);
        property_list *list = self->local;
        error = mlt_property_anim_set_double(property,
                                             value,
                                             fps,
                                             list->locale,
                                             position,
                                             length,
                                             keyframe_type);
        mlt_properties_do_mirror(self, name);
    }

    fire_property_changed(self, name);

    return error;
}

/** Get the animation associated to the name.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \return The animation object or NULL if the property has no animation
 */

mlt_animation mlt_properties_get_animation(mlt_properties self, const char *name)
{
    mlt_property value = mlt_properties_find(self, name);
    return value == NULL ? NULL : mlt_property_get_animation(value);
}

/** Set a property to a rectangle value.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to set
 * \param value the rectangle
 * \return true if error
 */

extern int mlt_properties_set_rect(mlt_properties self, const char *name, mlt_rect value)
{
    int error = 1;

    if (!self || !name)
        return error;

    // Fetch the property to work with
    mlt_property property = mlt_properties_fetch(self, name);

    // Set it if not NULL
    if (property != NULL) {
        error = mlt_property_set_rect(property, value);
        mlt_properties_do_mirror(self, name);
    }

    fire_property_changed(self, name);

    return error;
}

/** Get a rectangle associated to the name.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \return the rectangle value, the rectangle fields will be DBL_MIN if not found
 */

extern mlt_rect mlt_properties_get_rect(mlt_properties self, const char *name)
{
    property_list *list = self->local;
    mlt_property value = mlt_properties_find(self, name);
    mlt_rect rect = {DBL_MIN, DBL_MIN, DBL_MIN, DBL_MIN, DBL_MIN};
    return value == NULL ? rect : mlt_property_get_rect(value, list->locale);
}

/** Set a property to a rectangle value at a frame position.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to set
 * \param value the rectangle
 * \param position the frame number
 * \param length the maximum number of frames when interpreting negative keyframe times,
 *  <=0 if you don't care or need that
 * \param keyframe_type the interpolation method for this keyframe
 * \return true if error
 */

extern int mlt_properties_anim_set_rect(mlt_properties self,
                                        const char *name,
                                        mlt_rect value,
                                        int position,
                                        int length,
                                        mlt_keyframe_type keyframe_type)
{
    int error = 1;

    if (!self || !name)
        return error;

    // Fetch the property to work with
    mlt_property property = mlt_properties_fetch(self, name);

    // Set it if not NULL
    if (property != NULL) {
        mlt_profile profile = mlt_properties_get_data(self, "_profile", NULL);
        double fps = mlt_profile_fps(profile);
        property_list *list = self->local;
        error = mlt_property_anim_set_rect(property,
                                           value,
                                           fps,
                                           list->locale,
                                           position,
                                           length,
                                           keyframe_type);
        mlt_properties_do_mirror(self, name);
    }

    fire_property_changed(self, name);

    return error;
}

/** Get a rectangle associated to the name at a frame position.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \param position the frame number
 * \param length the maximum number of frames when interpreting negative keyframe times,
 *  <=0 if you don't care or need that
 * \return the rectangle value, the rectangle fields will be DBL_MIN if not found
 */

extern mlt_rect mlt_properties_anim_get_rect(mlt_properties self,
                                             const char *name,
                                             int position,
                                             int length)
{
    mlt_profile profile = mlt_properties_get_data(self, "_profile", NULL);
    double fps = mlt_profile_fps(profile);
    property_list *list = self->local;
    mlt_property value = mlt_properties_find(self, name);
    mlt_rect rect = {DBL_MIN, DBL_MIN, DBL_MIN, DBL_MIN, DBL_MIN};
    return value == NULL ? rect
                         : mlt_property_anim_get_rect(value, fps, list->locale, position, length);
}

#ifndef _WIN32

// See win32/win32.c for win32 implementation.

/** Convert UTF-8 property to the locale-defined encoding.
 *
 * MLT uses UTF-8 for strings, but Windows cannot accept UTF-8 for a filename.
 * Windows uses code pages for the locale encoding.
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name_from the property to read whose value is a UTF-8 string
 * \param name_to the name of the new property that will contain converted string
 * \return true if error
 */

int mlt_properties_from_utf8(mlt_properties properties, const char *name_from, const char *name_to)
{
    // On non-Windows platforms, assume UTF-8 will always work and does not need conversion.
    // This function just becomes a pass-through operation.
    // This was largely chosen to prevent adding a libiconv dependency to the framework per policy.
    // However, for file open operations on Windows, especially when processing XML, a text codec
    // dependency is hardly avoidable.
    return mlt_properties_set_string(properties, name_to, mlt_properties_get(properties, name_from));
}

#endif

/** Set a property to a nested properties object.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \param properties the properties list to nest into \p self with \p name
 * \return true if error
 */

int mlt_properties_set_properties(mlt_properties self, const char *name, mlt_properties properties)
{
    int error = 1;

    if (!self || !name || !properties)
        return error;

    // Fetch the property to work with
    mlt_property property = mlt_properties_fetch(self, name);

    // Set it if not NULL
    if (property != NULL) {
        error = mlt_property_set_properties(property, properties);
        mlt_properties_do_mirror(self, name);
    }

    fire_property_changed(self, name);

    return error;
}

/** Get a nested properties object by name.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \return the nested properties list
 */

mlt_properties mlt_properties_get_properties(mlt_properties self, const char *name)
{
    mlt_property value = mlt_properties_find(self, name);
    return value == NULL ? NULL : mlt_property_get_properties(value);
}

/** Get a nested properties object by index.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param index the 0-based index value of the list item
 * \return the nested properties list
 */

mlt_properties mlt_properties_get_properties_at(mlt_properties self, int index)
{
    if (!self)
        return NULL;
    property_list *list = self->local;
    if (index >= 0 && index < list->count)
        return mlt_property_get_properties(list->value[index]);
    return NULL;
}

/** Check if a property is animated.
 *
 * \public \memberof mlt_properties_s
 * \param self a properties list
 * \param name the property to get
 * \return true if the property is animated
 */

int mlt_properties_is_anim(mlt_properties self, const char *name)
{
    mlt_property property = mlt_properties_find(self, name);
    if (!property)
        return 0;
    property_list *list = self->local;
    pthread_mutex_lock(&list->mutex);
    int result = mlt_property_is_anim(property);
    pthread_mutex_unlock(&list->mutex);
    return result;
}
