src/isomedia/box_code_meta.c

/*
 *			GPAC - Multimedia Framework C SDK
 *
 *          Authors: Cyril Concolato / Jean Le Feuvre
 *			Copyright (c) Telecom ParisTech 2005-2019
 *					All rights reserved
 *
 *  This file is part of GPAC / ISO Media File Format sub-project
 *
 *  GPAC 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, or (at your option)
 *  any later version.
 *
 *  GPAC 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 see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <gpac/internal/isomedia_dev.h>
#include <gpac/constants.h>

#ifndef GPAC_DISABLE_ISOM

GF_Box *meta_box_new()
{
	ISOM_DECL_BOX_ALLOC(GF_MetaBox, GF_ISOM_BOX_TYPE_META);
	tmp->child_boxes = gf_list_new();
	return (GF_Box *)tmp;
}

void meta_reset(GF_Box *s)
{
	GF_MetaBox *ptr = (GF_MetaBox *)s;
	if (ptr == NULL) return;

	//destroy all boxes
	if (ptr->child_boxes) gf_isom_box_array_del(ptr->child_boxes);
	ptr->child_boxes = NULL;

	//reset pointers (destroyed above)
	ptr->handler = NULL;
	ptr->primary_resource = NULL;
	ptr->file_locations = NULL;
	ptr->item_locations = NULL;
	ptr->protections = NULL;
	ptr->item_infos = NULL;
	ptr->IPMP_control = NULL;
	ptr->item_refs = NULL;
	ptr->item_props = NULL;
	ptr->groups_list = NULL;
}

void meta_box_del(GF_Box *s)
{
	meta_reset(s);
	gf_free(s);
}


GF_Err meta_on_child_box(GF_Box *s, GF_Box *a, Bool is_rem)
{
	GF_MetaBox *ptr = (GF_MetaBox *)s;
	switch (a->type) {
	case GF_ISOM_BOX_TYPE_HDLR:
		BOX_FIELD_ASSIGN(handler, GF_HandlerBox)
		break;
	case GF_ISOM_BOX_TYPE_PITM:
		BOX_FIELD_ASSIGN(primary_resource, GF_PrimaryItemBox)
		break;
	case GF_ISOM_BOX_TYPE_DINF:
		BOX_FIELD_ASSIGN(file_locations, GF_DataInformationBox)
		break;
	case GF_ISOM_BOX_TYPE_ILOC:
		BOX_FIELD_ASSIGN(item_locations, GF_ItemLocationBox)
		break;
	case GF_ISOM_BOX_TYPE_IPRO:
		BOX_FIELD_ASSIGN(protections, GF_ItemProtectionBox)
		break;
	case GF_ISOM_BOX_TYPE_IINF:
		BOX_FIELD_ASSIGN(item_infos, GF_ItemInfoBox)
		break;
	case GF_ISOM_BOX_TYPE_IREF:
		BOX_FIELD_ASSIGN(item_refs, GF_ItemReferenceBox);
		break;
	case GF_ISOM_BOX_TYPE_IPRP:
		BOX_FIELD_ASSIGN(item_props, GF_ItemPropertiesBox)
		break;
	case GF_ISOM_BOX_TYPE_GRPL:
		BOX_FIELD_ASSIGN(groups_list, GF_GroupListBox)
		break;
	case GF_ISOM_BOX_TYPE_KEYS:
		BOX_FIELD_ASSIGN(keys, GF_MetaKeysBox)
		ptr->keys->meta = ptr;
		break;
	}
	return GF_OK;
}

GF_Err meta_box_read(GF_Box *s, GF_BitStream *bs)
{
	GF_MetaBox *ptr = (GF_MetaBox *)s;
	u64 pos = gf_bs_get_position(bs);
	u64 size = s->size;
	//probe 4->8 bytes, if equal to one of the following this is a QT meta
	u32 qt_type = (pos>8) ? gf_bs_peek_bits(bs, 32, 4) : 0;
	switch (qt_type) {
	case GF_4CC('h', 'd', 'l', 'r'):
	case GF_4CC('m', 'h', 'd', 'r'):
	case GF_4CC('k', 'e', 'y', 's'):
	case GF_4CC('i', 'l', 's', 't'):
	case GF_4CC('c', 't', 'r', 'y'):
	case GF_4CC('l', 'a', 'n', 'g'):
		break;
	default:
		qt_type = 0;
		break;
	}
	GF_Err e = GF_EOS;
	if (!qt_type) {
		ISOM_DECREASE_SIZE(s, 4)
		ptr->version = gf_bs_read_u8(bs);
		ptr->flags = gf_bs_read_u24(bs);
		e = gf_isom_box_array_read(s, bs);
	}

	/*try to hack around QT files which don't use a full box for meta, reparse*/
	if (e && (pos>8) ) {
		gf_bs_seek(bs, pos);
		meta_reset(s);
		s->size = size+4;
		ptr->is_qt = GF_TRUE;
		e = gf_isom_box_array_read(s, bs);
	}
	return e;
}

#ifndef GPAC_DISABLE_ISOM_WRITE
GF_Err meta_box_write(GF_Box *s, GF_BitStream *bs)
{
	GF_MetaBox *ptr = (GF_MetaBox *)s;
	if (ptr->write_qt) {
		return gf_isom_box_write_header(s, bs);
	}
	return gf_isom_full_box_write(s, bs);
}

GF_Err meta_box_size(GF_Box *s)
{
	u32 pos=0;
	GF_MetaBox *ptr = (GF_MetaBox *)s;

	gf_isom_check_position(s, (GF_Box *)ptr->handler, &pos);
	gf_isom_check_position(s, (GF_Box *)ptr->primary_resource, &pos);
	gf_isom_check_position(s, (GF_Box *)ptr->file_locations, &pos);
	gf_isom_check_position(s, (GF_Box *)ptr->item_locations, &pos);
	gf_isom_check_position(s, (GF_Box *)ptr->protections, &pos);
	gf_isom_check_position(s, (GF_Box *)ptr->item_infos, &pos);
	gf_isom_check_position(s, (GF_Box *)ptr->item_refs, &pos);
	gf_isom_check_position(s, (GF_Box *)ptr->item_props, &pos);
	gf_isom_check_position(s, (GF_Box *)ptr->groups_list, &pos);
	gf_isom_check_position(s, (GF_Box *)ptr->keys, &pos);

	if (!ptr->write_qt)
		s->size+=4;
	return GF_OK;
}
#endif /*GPAC_DISABLE_ISOM_WRITE*/

GF_Box *xml_box_new()
{
	ISOM_DECL_BOX_ALLOC(GF_XMLBox, GF_ISOM_BOX_TYPE_XML);
	return (GF_Box *)tmp;
}

void xml_box_del(GF_Box *s)
{
	GF_XMLBox *ptr = (GF_XMLBox *)s;
	if (ptr == NULL) return;
	if (ptr->xml) gf_free(ptr->xml);
	gf_free(ptr);
}

GF_Err xml_box_read(GF_Box *s, GF_BitStream *bs)
{
	GF_XMLBox *ptr = (GF_XMLBox *)s;
	return gf_isom_read_null_terminated_string(s, bs, s->size, &ptr->xml);
}

#ifndef GPAC_DISABLE_ISOM_WRITE
GF_Err xml_box_write(GF_Box *s, GF_BitStream *bs)
{
	GF_Err e;
	GF_XMLBox *ptr = (GF_XMLBox *)s;
	if (!s) return GF_BAD_PARAM;
	e = gf_isom_full_box_write(s, bs);
	if (e) return e;
	if (ptr->xml) gf_bs_write_data(bs, ptr->xml, (u32) strlen(ptr->xml));
	gf_bs_write_u8(bs, 0);
	return GF_OK;
}

GF_Err xml_box_size(GF_Box *s)
{
	GF_XMLBox *ptr = (GF_XMLBox *)s;
	if (!s) return GF_BAD_PARAM;
    ptr->size += (ptr->xml ? strlen(ptr->xml) : 0) + 1;
	return GF_OK;
}
#endif /*GPAC_DISABLE_ISOM_WRITE*/

GF_Box *bxml_box_new()
{
	ISOM_DECL_BOX_ALLOC(GF_BinaryXMLBox, GF_ISOM_BOX_TYPE_BXML);
	return (GF_Box *)tmp;
}

void bxml_box_del(GF_Box *s)
{
	GF_BinaryXMLBox *ptr = (GF_BinaryXMLBox *)s;
	if (ptr == NULL) return;
	if (ptr->data) gf_free(ptr->data);
	gf_free(ptr);
}

GF_Err bxml_box_read(GF_Box *s, GF_BitStream *bs)
{
	GF_BinaryXMLBox *ptr = (GF_BinaryXMLBox *)s;

	ptr->data_length = (u32)(ptr->size);
	ptr->data = (char*)gf_malloc(sizeof(char)*ptr->data_length);
	if (!ptr->data) return GF_OUT_OF_MEM;
	gf_bs_read_data(bs, ptr->data, ptr->data_length);
	return GF_OK;
}

#ifndef GPAC_DISABLE_ISOM_WRITE
GF_Err bxml_box_write(GF_Box *s, GF_BitStream *bs)
{
	GF_Err e;
	GF_BinaryXMLBox *ptr = (GF_BinaryXMLBox *)s;
	if (!s) return GF_BAD_PARAM;
	e = gf_isom_full_box_write(s, bs);
	if (e) return e;
	if (ptr->data_length) gf_bs_write_data(bs, ptr->data, ptr->data_length);
	return GF_OK;
}

GF_Err bxml_box_size(GF_Box *s)
{
	GF_BinaryXMLBox *ptr = (GF_BinaryXMLBox *)s;
	if (!s) return GF_BAD_PARAM;
	ptr->size += ptr->data_length;
	return GF_OK;
}
#endif /*GPAC_DISABLE_ISOM_WRITE*/

GF_Box *iloc_box_new()
{
	ISOM_DECL_BOX_ALLOC(GF_ItemLocationBox, GF_ISOM_BOX_TYPE_ILOC);
	tmp->location_entries = gf_list_new();
	return (GF_Box *)tmp;
}

void iloc_entry_del(GF_ItemLocationEntry *location)
{
	u32 j, extent_count;
	extent_count = gf_list_count(location->extent_entries);
	for (j = 0; j < extent_count; j++) {
		GF_ItemExtentEntry *extent = (GF_ItemExtentEntry *)gf_list_get(location->extent_entries, j);
		gf_free(extent);
	}
	gf_list_del(location->extent_entries);
	gf_free(location);
}

void iloc_box_del(GF_Box *s)
{
	u32 i, item_count;
	GF_ItemLocationBox *ptr = (GF_ItemLocationBox *)s;
	if (ptr == NULL) return;
	item_count = gf_list_count(ptr->location_entries);
	for (i = 0; i < item_count; i++) {
		GF_ItemLocationEntry *location = (GF_ItemLocationEntry *)gf_list_get(ptr->location_entries, i);
		iloc_entry_del(location);
	}
	gf_list_del(ptr->location_entries);
	gf_free(ptr);
}

GF_Err iloc_box_read(GF_Box *s, GF_BitStream *bs)
{
	u32 item_count, extent_count, i, j;
	GF_ItemLocationBox *ptr = (GF_ItemLocationBox *)s;

	ISOM_DECREASE_SIZE(ptr, 2)
	ptr->offset_size = gf_bs_read_int(bs, 4);
	ptr->length_size = gf_bs_read_int(bs, 4);
	ptr->base_offset_size = gf_bs_read_int(bs, 4);
	if (ptr->version == 1 || ptr->version == 2) {
		ptr->index_size = gf_bs_read_int(bs, 4);
	} else {
		gf_bs_read_int(bs, 4);
	}
	if (ptr->version < 2) {
		ISOM_DECREASE_SIZE(ptr, 2)
		item_count = gf_bs_read_u16(bs);
	} else {
		ISOM_DECREASE_SIZE(ptr, 4)
		item_count = gf_bs_read_u32(bs);
	}
	u32 base_size;
	if (ptr->version < 2) {
		base_size=2;
	} else {
		base_size=4;
	}
	if (ptr->version == 1 || ptr->version == 2) {
		base_size+=2;
	}
	if ((u64)base_size*item_count>ptr->size) {
		ISOM_DECREASE_SIZE(ptr, (u64)base_size*item_count)
	}

	for (i = 0; i < item_count; i++) {
		u32 bpe;
		GF_ItemLocationEntry *location_entry;
		GF_SAFEALLOC(location_entry, GF_ItemLocationEntry);
		if (!location_entry) return GF_OUT_OF_MEM;

		gf_list_add(ptr->location_entries, location_entry);
		if (ptr->version < 2) {
			ISOM_DECREASE_SIZE(ptr, 2)
			location_entry->item_ID = gf_bs_read_u16(bs);
		} else {
			ISOM_DECREASE_SIZE(ptr, 4)
			location_entry->item_ID = gf_bs_read_u32(bs);
		}
		if (ptr->version == 1 || ptr->version == 2) {
			ISOM_DECREASE_SIZE(ptr, 2)
			location_entry->construction_method = gf_bs_read_u16(bs);
		}
		else {
			location_entry->construction_method = 0;
		}
		ISOM_DECREASE_SIZE(ptr, (2 + ptr->base_offset_size) )
		location_entry->data_reference_index = gf_bs_read_u16(bs);
		location_entry->base_offset = gf_bs_read_int(bs, 8*ptr->base_offset_size);
#ifndef GPAC_DISABLE_ISOM_WRITE
		location_entry->original_base_offset = location_entry->base_offset;
#endif

		ISOM_DECREASE_SIZE(ptr, 2)
		extent_count = gf_bs_read_u16(bs);
		location_entry->extent_entries = gf_list_new();
		bpe = (ptr->offset_size+ptr->length_size);
		if ((ptr->version == 1 || ptr->version == 2) && ptr->index_size > 0)
			bpe = ptr->index_size;
		if ((u64)bpe * extent_count > ptr->size) {
			ISOM_DECREASE_SIZE(ptr, (u64)bpe * extent_count)
		}

		for (j = 0; j < extent_count; j++) {
			GF_ItemExtentEntry *extent_entry;
			GF_SAFEALLOC(extent_entry, GF_ItemExtentEntry);
			if (!extent_entry) return GF_OUT_OF_MEM;
			
			gf_list_add(location_entry->extent_entries, extent_entry);
			if ((ptr->version == 1 || ptr->version == 2) && ptr->index_size > 0) {
				ISOM_DECREASE_SIZE(ptr, ptr->index_size)
				extent_entry->extent_index = gf_bs_read_int(bs, 8 * ptr->index_size);
			}
			else {
				extent_entry->extent_index = 0;
			}
			ISOM_DECREASE_SIZE(ptr, (ptr->offset_size+ptr->length_size) )

			extent_entry->extent_offset = gf_bs_read_int(bs, 8*ptr->offset_size);
			extent_entry->extent_length = gf_bs_read_int(bs, 8*ptr->length_size);
#ifndef GPAC_DISABLE_ISOM_WRITE
			extent_entry->original_extent_offset = extent_entry->extent_offset;
#endif
		}
	}
	return GF_OK;
}

#ifndef GPAC_DISABLE_ISOM_WRITE
GF_Err iloc_box_write(GF_Box *s, GF_BitStream *bs)
{
	GF_Err e;
	u32 i, j, item_count, extent_count;
	GF_ItemLocationBox *ptr = (GF_ItemLocationBox *)s;
	if (!s) return GF_BAD_PARAM;
	e = gf_isom_full_box_write(s, bs);
	if (e) return e;
	gf_bs_write_int(bs, ptr->offset_size, 4);
	gf_bs_write_int(bs, ptr->length_size, 4);
	gf_bs_write_int(bs, ptr->base_offset_size, 4);
	gf_bs_write_int(bs, ptr->index_size, 4);
	item_count = gf_list_count(ptr->location_entries);
	if (ptr->version < 2) {
		gf_bs_write_u16(bs, item_count);
	}
	else {
		gf_bs_write_u32(bs, item_count);
	}
	for (i = 0; i < item_count; i++) {
		GF_ItemLocationEntry *location = (GF_ItemLocationEntry *)gf_list_get(ptr->location_entries, i);
		if (ptr->version < 2) {
			gf_bs_write_u16(bs, location->item_ID);
		}
		else {
			gf_bs_write_u32(bs, location->item_ID);
		}
		if (ptr->version == 1 || ptr->version == 2) {
			gf_bs_write_u16(bs, location->construction_method);
		}
		gf_bs_write_u16(bs, location->data_reference_index);
		gf_bs_write_long_int(bs, location->base_offset, 8*ptr->base_offset_size);
		extent_count = gf_list_count(location->extent_entries);
		gf_bs_write_u16(bs, extent_count);
		for (j=0; j<extent_count; j++) {
			GF_ItemExtentEntry *extent = (GF_ItemExtentEntry *)gf_list_get(location->extent_entries, j);
			if ((ptr->version == 1 || ptr->version == 2) && ptr->index_size > 0) {
				gf_bs_write_long_int(bs, extent->extent_index, 8 * ptr->index_size);
			}
			gf_bs_write_long_int(bs, extent->extent_offset, 8*ptr->offset_size);
			gf_bs_write_long_int(bs, extent->extent_length, 8*ptr->length_size);
		}
	}
	return GF_OK;
}

GF_Err iloc_box_size(GF_Box *s)
{
	u32 i, item_count, extent_count;
	GF_ItemLocationBox *ptr = (GF_ItemLocationBox *)s;
	if (!s) return GF_BAD_PARAM;
	if (ptr->index_size) {
		ptr->version = 1;
	}
	item_count = gf_list_count(ptr->location_entries);
	for (i = 0; i < item_count; i++) {
		GF_ItemLocationEntry *location = (GF_ItemLocationEntry *)gf_list_get(ptr->location_entries, i);
		if (location->construction_method) {
			ptr->version = 1;
		}
		if (location->item_ID > 0xFFFF) {
			ptr->version = 2;
		}
	}
	ptr->size += 4;
	if (ptr->version == 2) {
		ptr->size += 2; // 32 bits item count instead of 16 bits
	}
	for (i = 0; i < item_count; i++) {
		GF_ItemLocationEntry *location = (GF_ItemLocationEntry *)gf_list_get(ptr->location_entries, i);
		extent_count = gf_list_count(location->extent_entries);
		ptr->size += 6 + ptr->base_offset_size + extent_count*(ptr->offset_size + ptr->length_size);
		if (ptr->version == 2) {
			ptr->size += 2; //32 bits item ID instead of 16 bits
		}
		if (ptr->version == 1 || ptr->version == 2) {
			ptr->size += 2; // construction_method
			ptr->size += extent_count*ptr->index_size;
		}
	}
	return GF_OK;
}
#endif /*GPAC_DISABLE_ISOM_WRITE*/

GF_Box *pitm_box_new()
{
	ISOM_DECL_BOX_ALLOC(GF_PrimaryItemBox, GF_ISOM_BOX_TYPE_PITM);
	return (GF_Box *)tmp;
}

void pitm_box_del(GF_Box *s)
{
	GF_PrimaryItemBox *ptr = (GF_PrimaryItemBox *)s;
	if (ptr == NULL) return;
	gf_free(ptr);
}

GF_Err pitm_box_read(GF_Box *s, GF_BitStream *bs)
{
	GF_PrimaryItemBox *ptr = (GF_PrimaryItemBox *)s;
	ISOM_DECREASE_SIZE(ptr, 2)
	ptr->item_ID = gf_bs_read_u16(bs);
	return GF_OK;
}

#ifndef GPAC_DISABLE_ISOM_WRITE
GF_Err pitm_box_write(GF_Box *s, GF_BitStream *bs)
{
	GF_Err e;
	GF_PrimaryItemBox *ptr = (GF_PrimaryItemBox *)s;
	if (!s) return GF_BAD_PARAM;
	e = gf_isom_full_box_write(s, bs);
	if (e) return e;
	gf_bs_write_u16(bs, ptr->item_ID);
	return GF_OK;
}

GF_Err pitm_box_size(GF_Box *s)
{
	GF_ItemLocationBox *ptr = (GF_ItemLocationBox *)s;
	if (!s) return GF_BAD_PARAM;
	ptr->size += 2;
	return GF_OK;
}
#endif /*GPAC_DISABLE_ISOM_WRITE*/

GF_Box *ipro_box_new()
{
	ISOM_DECL_BOX_ALLOC(GF_ItemProtectionBox, GF_ISOM_BOX_TYPE_IPRO);
	tmp->protection_information = gf_list_new();
	return (GF_Box *)tmp;
}

void ipro_box_del(GF_Box *s)
{
	GF_ItemProtectionBox *ptr = (GF_ItemProtectionBox *)s;
	if (ptr == NULL) return;
	gf_list_del(ptr->protection_information);
	gf_free(ptr);
}

GF_Err ipro_on_child_box(GF_Box *s, GF_Box *a, Bool is_rem)
{
	GF_ItemProtectionBox *ptr = (GF_ItemProtectionBox *)s;
	if (a->type == GF_ISOM_BOX_TYPE_SINF) {
		BOX_FIELD_LIST_ASSIGN(protection_information)
		return GF_OK;
	}
	return GF_OK;
}
GF_Err ipro_box_read(GF_Box *s, GF_BitStream *bs)
{
	ISOM_DECREASE_SIZE(s, 2)
	gf_bs_read_u16(bs);
	return gf_isom_box_array_read(s, bs);
}

#ifndef GPAC_DISABLE_ISOM_WRITE
GF_Err ipro_box_write(GF_Box *s, GF_BitStream *bs)
{
	u32 count;
	GF_Err e;
	GF_ItemProtectionBox *ptr = (GF_ItemProtectionBox *)s;
	if (!s) return GF_BAD_PARAM;
	e = gf_isom_full_box_write(s, bs);
	if (e) return e;
	count = gf_list_count(ptr->protection_information);
	gf_bs_write_u16(bs, count);
	return GF_OK;
}

GF_Err ipro_box_size(GF_Box *s)
{
	GF_ItemProtectionBox *ptr = (GF_ItemProtectionBox *)s;
	u32 pos=0;
	gf_isom_check_position_list(s, ptr->protection_information, &pos);
	s->size += 2;
	return GF_OK;
}
#endif /*GPAC_DISABLE_ISOM_WRITE*/

GF_Box *infe_box_new()
{
	ISOM_DECL_BOX_ALLOC(GF_ItemInfoEntryBox, GF_ISOM_BOX_TYPE_INFE);
	return (GF_Box *)tmp;
}

void infe_box_del(GF_Box *s)
{
	GF_ItemInfoEntryBox *ptr = (GF_ItemInfoEntryBox *)s;
	if (ptr == NULL) return;
	if (ptr->item_name) gf_free(ptr->item_name);
	if (ptr->full_path) gf_free(ptr->full_path);
	if (ptr->content_type) gf_free(ptr->content_type);
	if (ptr->content_encoding) gf_free(ptr->content_encoding);
	gf_free(ptr);
}

GF_Err infe_box_read(GF_Box *s, GF_BitStream *bs)
{
	char *buf;
	u32 buf_len, i, string_len, string_start;
	GF_ItemInfoEntryBox *ptr = (GF_ItemInfoEntryBox *)s;

	ISOM_DECREASE_SIZE(ptr, 4);
	ptr->item_ID = gf_bs_read_u16(bs);
	ptr->item_protection_index = gf_bs_read_u16(bs);

	if (ptr->version == 2) {
		ISOM_DECREASE_SIZE(ptr, 4);
		ptr->item_type = gf_bs_read_u32(bs);
	}
	buf_len = (u32) (ptr->size);
	buf = (char*)gf_malloc(buf_len);
	if (!buf) return GF_OUT_OF_MEM;
	if (buf_len != gf_bs_read_data(bs, buf, buf_len)) {
		gf_free(buf);
		return GF_ISOM_INVALID_FILE;
	}
	string_len = 1;
	string_start = 0;
	for (i = 0; i < buf_len; i++) {
		if (buf[i] == 0) {
			if (!ptr->item_name) {
				ptr->item_name = (char*)gf_malloc(sizeof(char)*string_len);
				if (!ptr->item_name) return GF_OUT_OF_MEM;
				memcpy(ptr->item_name, buf+string_start, string_len);
			} else if (!ptr->content_type) {
				ptr->content_type = (char*)gf_malloc(sizeof(char)*string_len);
				if (!ptr->content_type) return GF_OUT_OF_MEM;
				memcpy(ptr->content_type, buf+string_start, string_len);
			} else if (!ptr->content_encoding) {
				ptr->content_encoding = (char*)gf_malloc(sizeof(char)*string_len);
				if (!ptr->content_encoding) return GF_OUT_OF_MEM;
				memcpy(ptr->content_encoding, buf+string_start, string_len);
			} else {
				//we could throw an error but we silently accept this infe
				break;
			}
			string_start += string_len;
			string_len = 0;
			if (ptr->content_encoding && ptr->version == 1) {
				break;
			}
		}
		string_len++;
	}
	gf_free(buf);

	if (!ptr->item_name || (!ptr->content_type && ptr->version < 2)) {
		GF_LOG(GF_LOG_WARNING, GF_LOG_CONTAINER, ("[isoff] Infe without name or content type !\n"));
	}

	if (ptr->item_name && !ptr->item_name[0]) {
		gf_free(ptr->item_name);
		ptr->item_name = NULL;
	}
	if (ptr->content_type && !ptr->content_type[0]) {
		gf_free(ptr->content_type);
		ptr->content_type = NULL;
	}
	if (ptr->content_encoding && !ptr->content_encoding[0]) {
		gf_free(ptr->content_encoding);
		ptr->content_encoding = NULL;
	}
	
	return GF_OK;
}

#ifndef GPAC_DISABLE_ISOM_WRITE
GF_Err infe_box_write(GF_Box *s, GF_BitStream *bs)
{
	GF_Err e;
	u32 len;
	GF_ItemInfoEntryBox *ptr = (GF_ItemInfoEntryBox *)s;
	if (!s) return GF_BAD_PARAM;
	e = gf_isom_full_box_write(s, bs);
	if (e) return e;
	if (ptr->version == 3) {
		gf_bs_write_u32(bs, ptr->item_ID);
	}
	else {
		gf_bs_write_u16(bs, ptr->item_ID);
	}
	gf_bs_write_u16(bs, ptr->item_protection_index);
	if (ptr->version >= 2) {
		gf_bs_write_u32(bs, ptr->item_type);
	}
	if (ptr->item_name) {
		len = (u32) strlen(ptr->item_name)+1;
		gf_bs_write_data(bs, ptr->item_name, len);
	} else {
		gf_bs_write_byte(bs, 0, 1);
	}
	if (ptr->item_type == GF_META_ITEM_TYPE_MIME || ptr->item_type == GF_META_ITEM_TYPE_URI) {
		if (ptr->content_type) {
			len = (u32)strlen(ptr->content_type) + 1;
			gf_bs_write_data(bs, ptr->content_type, len);
		}
		else {
			gf_bs_write_byte(bs, 0, 1);
		}
	}
	if (ptr->item_type == GF_META_ITEM_TYPE_MIME) {
		if (ptr->content_encoding) {
			len = (u32)strlen(ptr->content_encoding) + 1;
			gf_bs_write_data(bs, ptr->content_encoding, len);
		}
		else {
			gf_bs_write_byte(bs, 0, 1);
		}
	}
	return GF_OK;
}

GF_Err infe_box_size(GF_Box *s)
{
	GF_ItemInfoEntryBox *ptr = (GF_ItemInfoEntryBox *)s;
	if (!s) return GF_BAD_PARAM;
	if (ptr->item_type) {
		ptr->version = 2;
		if (ptr->item_ID > 0xFFFF) {
			ptr->version = 3;
		}
	}
	else {
		ptr->version = 0;
	}
	ptr->size += 4;
	if (ptr->version == 3) {
		ptr->size += 2; // item_ID on 32 bits (+2 bytes)
	}
	if (ptr->version >= 2) {
		ptr->size += 4; // item_type size
	}
	if (ptr->item_name) ptr->size += strlen(ptr->item_name)+1;
	else ptr->size += 1;
	if (ptr->item_type == GF_META_ITEM_TYPE_MIME || ptr->item_type == GF_META_ITEM_TYPE_URI) {
		if (ptr->content_type) ptr->size += strlen(ptr->content_type) + 1;
		else ptr->size += 1;
	}
	if (ptr->item_type == GF_META_ITEM_TYPE_MIME) {
		if (ptr->content_encoding) ptr->size += strlen(ptr->content_encoding) + 1;
		else ptr->size += 1;
	}
	return GF_OK;
}
#endif /*GPAC_DISABLE_ISOM_WRITE*/

GF_Box *iinf_box_new()
{
	ISOM_DECL_BOX_ALLOC(GF_ItemInfoBox, GF_ISOM_BOX_TYPE_IINF);
	tmp->item_infos = gf_list_new();
	return (GF_Box *)tmp;
}

void iinf_box_del(GF_Box *s)
{
	GF_ItemInfoBox *ptr = (GF_ItemInfoBox *)s;
	if (ptr == NULL) return;
	gf_list_del(ptr->item_infos);
	gf_free(ptr);
}

GF_Err iinf_on_child_box(GF_Box *s, GF_Box *a, Bool is_rem)
{
	GF_ItemInfoBox *ptr = (GF_ItemInfoBox *)s;

	if (a->type == GF_ISOM_BOX_TYPE_INFE) {
		BOX_FIELD_LIST_ASSIGN(item_infos)
		return GF_OK;
	} else {
		return GF_OK;
	}
}

GF_Err iinf_box_read(GF_Box *s, GF_BitStream *bs)
{
	GF_ItemInfoBox *ptr = (GF_ItemInfoBox *)s;

	if (ptr->version == 0) {
		ISOM_DECREASE_SIZE(s, 2)
		gf_bs_read_u16(bs);
	} else {
		ISOM_DECREASE_SIZE(s, 4)
		gf_bs_read_u32(bs);
	}
	return gf_isom_box_array_read(s, bs);
}

#ifndef GPAC_DISABLE_ISOM_WRITE
GF_Err iinf_box_write(GF_Box *s, GF_BitStream *bs)
{
	u32 count;
	GF_Err e;
	GF_ItemInfoBox *ptr = (GF_ItemInfoBox *)s;
	if (!s) return GF_BAD_PARAM;
	e = gf_isom_full_box_write(s, bs);
	if (e) return e;
	count = gf_list_count(ptr->item_infos);
	if (ptr->version == 0)
		gf_bs_write_u16(bs, count);
	else
		gf_bs_write_u32(bs, count);

	return GF_OK;
}

GF_Err iinf_box_size(GF_Box *s)
{
	u32 pos=0;
	GF_ItemInfoBox *ptr = (GF_ItemInfoBox *)s;
	if (!s) return GF_BAD_PARAM;
	ptr->size += (ptr->version == 0) ? 2 : 4;
	gf_isom_check_position_list(s, ptr->item_infos, &pos);
	return GF_OK;
}
#endif /*GPAC_DISABLE_ISOM_WRITE*/

GF_Err iref_on_child_box(GF_Box *s, GF_Box *a, Bool is_rem)
{
	GF_ItemReferenceBox *ptr = (GF_ItemReferenceBox *)s;
	BOX_FIELD_LIST_ASSIGN(references)
	return GF_OK;
}

void iref_box_del(GF_Box *s)
{
	GF_ItemReferenceBox *ptr = (GF_ItemReferenceBox *)s;
	if (ptr == NULL) return;
	gf_list_del(ptr->references);
	gf_free(ptr);
}


GF_Err iref_box_read(GF_Box *s, GF_BitStream *bs)
{
	return gf_isom_box_array_read(s, bs);
}

GF_Box *iref_box_new()
{
	ISOM_DECL_BOX_ALLOC(GF_ItemReferenceBox, GF_ISOM_BOX_TYPE_IREF);
	tmp->references = gf_list_new();
	return (GF_Box *)tmp;
}

#ifndef GPAC_DISABLE_ISOM_WRITE

GF_Err iref_box_write(GF_Box *s, GF_BitStream *bs)
{
	return gf_isom_full_box_write(s, bs);
}

GF_Err iref_box_size(GF_Box *s)
{
	u32 pos=0;
	GF_ItemReferenceBox *ptr = (GF_ItemReferenceBox *)s;
	gf_isom_check_position_list(s, ptr->references, &pos);
	return GF_OK;
}

#endif /*GPAC_DISABLE_ISOM_WRITE*/

void ireftype_box_del(GF_Box *s)
{
	GF_ItemReferenceTypeBox *ptr = (GF_ItemReferenceTypeBox *)s;
	if (!ptr) return;
	if (ptr->to_item_IDs) gf_free(ptr->to_item_IDs);
	gf_free(ptr);
}

GF_Err ireftype_box_read(GF_Box *s, GF_BitStream *bs)
{
	u32 i;
	GF_ItemReferenceTypeBox *ptr = (GF_ItemReferenceTypeBox *)s;

	ISOM_DECREASE_SIZE(ptr, 4)
	ptr->from_item_id = gf_bs_read_u16(bs);
	ptr->reference_count = gf_bs_read_u16(bs);
	if (ptr->size / 2 < ptr->reference_count)
		return GF_ISOM_INVALID_FILE;

	ptr->to_item_IDs = (u32 *)gf_malloc(ptr->reference_count * sizeof(u32));
	if (!ptr->to_item_IDs) return GF_OUT_OF_MEM;

	for (i=0; i < ptr->reference_count; i++) {
		ISOM_DECREASE_SIZE(ptr, 2)
		ptr->to_item_IDs[i] = gf_bs_read_u16(bs);
	}
	return GF_OK;
}

GF_Box *ireftype_box_new()
{
	ISOM_DECL_BOX_ALLOC(GF_ItemReferenceTypeBox, GF_ISOM_BOX_TYPE_REFI);
	return (GF_Box *)tmp;
}

#ifndef GPAC_DISABLE_ISOM_WRITE

GF_Err ireftype_box_write(GF_Box *s, GF_BitStream *bs)
{
	GF_Err e;
	u32 i;
	GF_ItemReferenceTypeBox *ptr = (GF_ItemReferenceTypeBox *)s;
	ptr->type = ptr->reference_type;
	e = gf_isom_box_write_header(s, bs);
	ptr->type = GF_ISOM_BOX_TYPE_REFI;
	if (e) return e;
	gf_bs_write_u16(bs, ptr->from_item_id);
	gf_bs_write_u16(bs, ptr->reference_count);
	for (i = 0; i < ptr->reference_count; i++) {
		gf_bs_write_u16(bs, ptr->to_item_IDs[i]);
	}
	return GF_OK;
}


GF_Err ireftype_box_size(GF_Box *s)
{
	GF_ItemReferenceTypeBox *ptr = (GF_ItemReferenceTypeBox *)s;
	ptr->size += 4 + (ptr->reference_count * sizeof(u16));
	return GF_OK;
}

#endif /*GPAC_DISABLE_ISOM_WRITE*/

GF_Box *amve_box_new()
{
	ISOM_DECL_BOX_ALLOC(GF_AmbientViewingEnvBox, GF_ISOM_BOX_TYPE_AMVE);
	return (GF_Box *)tmp;
}


void amve_box_del(GF_Box *s)
{
	GF_AmbientViewingEnvBox *ptr = (GF_AmbientViewingEnvBox*)s;
	if (ptr == NULL) return;
	gf_free(ptr);
}

GF_Err amve_box_read(GF_Box *s, GF_BitStream *bs)
{
	GF_AmbientViewingEnvBox *ptr = (GF_AmbientViewingEnvBox*)s;
	ptr->ambient_illuminance = gf_bs_read_int(bs, 32);
	ptr->ambient_light_x = gf_bs_read_int(bs, 16);
	ptr->ambient_light_y = gf_bs_read_int(bs, 16);
	return GF_OK;
}


#ifndef GPAC_DISABLE_ISOM_WRITE

GF_Err amve_box_write(GF_Box *s, GF_BitStream *bs)
{
	GF_AmbientViewingEnvBox *ptr = (GF_AmbientViewingEnvBox *)s;
	GF_Err e = gf_isom_box_write_header(s, bs);
	if (e) return e;
	gf_bs_write_int(bs, ptr->ambient_illuminance, 32);
	gf_bs_write_int(bs, ptr->ambient_light_x, 16);
	gf_bs_write_int(bs, ptr->ambient_light_y, 16);
	return GF_OK;
}

GF_Err amve_box_size(GF_Box *s)
{
	s->size += 8;
	return GF_OK;
}

#endif /*GPAC_DISABLE_ISOM_WRITE*/
#endif /*GPAC_DISABLE_ISOM*/