src/isomedia/tx3g.c

/*
 *			GPAC - Multimedia Framework C SDK
 *
 *			Authors: Jean Le Feuvre
 *			Copyright (c) Telecom ParisTech 2000-2025
 *					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

static u32 rgb_48_to_32(char *val)
{
	u32 res = 0x0;
	u32 i;

	for (i=0; i<3; i++) {
		u32 v = val[2*i];
		v<<=8;
		v|=val[2*i + 1];
		v/=0xFF;

		res <<= 8;
		res |= v;
	}
	return res;
}

GF_EXPORT
GF_Err gf_isom_get_text_description(GF_ISOFile *movie, u32 trackNumber, u32 descriptionIndex, GF_TextSampleDescriptor **out_desc)
{
	GF_TrackBox *trak;
	u32 i;
	GF_Tx3gSampleEntryBox *txt = NULL;
	GF_TextSampleEntryBox *qt_txt = NULL;
	if (!descriptionIndex || !out_desc) return GF_BAD_PARAM;

	trak = gf_isom_get_track_box(movie, trackNumber);
	if (!trak || !trak->Media) return GF_BAD_PARAM;

	switch (trak->Media->handler->handlerType) {
	case GF_ISOM_MEDIA_TEXT:
	case GF_ISOM_MEDIA_SUBT:
	case GF_ISOM_MEDIA_MPEG_SUBT:
		break;
	default:
		return GF_BAD_PARAM;
	}

	txt = (GF_Tx3gSampleEntryBox*)gf_list_get(trak->Media->information->sampleTable->SampleDescription->child_boxes, descriptionIndex - 1);
	if (!txt) return GF_BAD_PARAM;
	switch (txt->type) {
	case GF_ISOM_BOX_TYPE_TX3G:
		break;
	case GF_ISOM_BOX_TYPE_TEXT:
		qt_txt = (GF_TextSampleEntryBox *)txt;
		txt = NULL;
		break;
	default:
		return GF_BAD_PARAM;
	}

	(*out_desc) = (GF_TextSampleDescriptor *) gf_odf_desc_new(GF_ODF_TX3G_TAG);
	if (! (*out_desc) ) return GF_OUT_OF_MEM;

	if (qt_txt) {
		(*out_desc)->back_color = rgb_48_to_32(qt_txt->background_color);
		(*out_desc)->default_pos = qt_txt->default_box;
		(*out_desc)->default_style.style_flags = 0; //todo, expose qt_txt->fontFace;
		(*out_desc)->default_style.text_color = rgb_48_to_32(qt_txt->foreground_color);
		(*out_desc)->displayFlags = qt_txt->displayFlags;
		(*out_desc)->vert_justif = -1;
		(*out_desc)->horiz_justif = qt_txt->textJustification;
		if (qt_txt->textName) {
			(*out_desc)->font_count = 1;
			(*out_desc)->fonts = (GF_FontRecord *) gf_malloc(sizeof(GF_FontRecord));
			(*out_desc)->fonts[0].fontName = gf_strdup(qt_txt->textName);
		}
	} else {
		(*out_desc)->back_color = txt->back_color;
		(*out_desc)->default_pos = txt->default_box;
		(*out_desc)->default_style = txt->default_style;
		(*out_desc)->displayFlags = txt->displayFlags;
		(*out_desc)->vert_justif = txt->vertical_justification;
		(*out_desc)->horiz_justif = txt->horizontal_justification;
		if (txt->font_table && txt->font_table->entry_count) {
			(*out_desc)->font_count = txt->font_table->entry_count;
			(*out_desc)->fonts = (GF_FontRecord *) gf_malloc(sizeof(GF_FontRecord) * txt->font_table->entry_count);
			for (i=0; i<txt->font_table->entry_count; i++) {
				(*out_desc)->fonts[i].fontID = txt->font_table->fonts[i].fontID;
				(*out_desc)->fonts[i].fontName = NULL;
				if (txt->font_table->fonts[i].fontName)
					(*out_desc)->fonts[i].fontName = gf_strdup(txt->font_table->fonts[i].fontName);
			}
		}
	}
	return GF_OK;
}

#ifndef GPAC_DISABLE_ISOM_WRITE

#if 0 //unused
/*! updates text sample description
\param isom_file the target ISO file
\param trackNumber the target track
\param sampleDescriptionIndex the target sample description index
\param desc the text sample descriptor to use
\return error if any
*/
GF_Err gf_isom_update_text_description(GF_ISOFile *movie, u32 trackNumber, u32 descriptionIndex, GF_TextSampleDescriptor *desc)
{
	GF_TrackBox *trak;
	GF_Err e;
	Bool is_qt_text = GF_FALSE;
	u32 i;
	GF_Tx3gSampleEntryBox *txt;

	if (!descriptionIndex || !desc) return GF_BAD_PARAM;
	e = gf_isom_can_access_movie(movie, GF_ISOM_OPEN_WRITE);
	if (e) return e;

	trak = gf_isom_get_track_box(movie, trackNumber);
	if (!trak || !trak->Media || !desc->font_count) return GF_BAD_PARAM;

	switch (trak->Media->handler->handlerType) {
	case GF_ISOM_MEDIA_TEXT:
	case GF_ISOM_MEDIA_SUBT:
	case GF_ISOM_MEDIA_MPEG_SUBT:
		break;
	default:
		return GF_BAD_PARAM;
	}

	txt = (GF_Tx3gSampleEntryBox*)gf_list_get(trak->Media->information->sampleTable->SampleDescription->child_boxes, descriptionIndex - 1);
	if (!txt) return GF_BAD_PARAM;
	switch (txt->type) {
	case GF_ISOM_BOX_TYPE_TX3G:
		break;
	case GF_ISOM_BOX_TYPE_TEXT:
		is_qt_text = GF_TRUE;
		break;
	default:
		return GF_BAD_PARAM;
	}

	if (!movie->keep_utc)
		trak->Media->mediaHeader->modificationTime = gf_isom_get_mp4time();

	txt->back_color = desc->back_color;
	txt->default_box = desc->default_pos;
	txt->default_style = desc->default_style;
	txt->displayFlags = desc->displayFlags;
	txt->vertical_justification = desc->vert_justif;
	txt->horizontal_justification = desc->horiz_justif;
	if (is_qt_text) {
		GF_TextSampleEntryBox *qtt = (GF_TextSampleEntryBox *) txt;
		if (qtt->textName) gf_free(qtt->textName);
		qtt->textName = NULL;
		if (desc->font_count) {
			qtt->textName = gf_strdup(desc->fonts[0].fontName);
		}
	} else {
		if (txt->font_table) gf_isom_box_del_parent(&txt->child_boxes, (GF_Box*)txt->font_table);

		txt->font_table = (GF_FontTableBox *)gf_isom_box_new_parent(&txt->child_boxes, GF_ISOM_BOX_TYPE_FTAB);
		txt->font_table->entry_count = desc->font_count;
		txt->font_table->fonts = (GF_FontRecord *) gf_malloc(sizeof(GF_FontRecord) * desc->font_count);
		for (i=0; i<desc->font_count; i++) {
			txt->font_table->fonts[i].fontID = desc->fonts[i].fontID;
			if (desc->fonts[i].fontName) txt->font_table->fonts[i].fontName = gf_strdup(desc->fonts[i].fontName);
		}
	}
	return e;
}
#endif //unused

GF_EXPORT
GF_Err gf_isom_new_text_description(GF_ISOFile *movie, u32 trackNumber, GF_TextSampleDescriptor *desc, const char *URLname, const char *URNname, u32 *outDescriptionIndex)
{
	GF_TrackBox *trak;
	GF_Err e;
	u32 dataRefIndex, i;
	GF_Tx3gSampleEntryBox *txt;

	e = gf_isom_can_access_movie(movie, GF_ISOM_OPEN_WRITE);
	if (e) return e;

	trak = gf_isom_get_track_box(movie, trackNumber);
	if (!trak || !trak->Media || !desc) return GF_BAD_PARAM;

	switch (trak->Media->handler->handlerType) {
	case GF_ISOM_MEDIA_TEXT:
	case GF_ISOM_MEDIA_SUBT:
	case GF_ISOM_MEDIA_MPEG_SUBT:
		break;
	default:
		return GF_BAD_PARAM;
	}

	//get or create the data ref
	e = Media_FindDataRef(trak->Media->information->dataInformation->dref, (char *)URLname, (char *)URNname, &dataRefIndex);
	if (e) return e;
	if (!dataRefIndex) {
		e = Media_CreateDataRef(movie, trak->Media->information->dataInformation->dref, (char *)URLname, (char *)URNname, &dataRefIndex);
		if (e) return e;
	}
	if (!movie->keep_utc)
		trak->Media->mediaHeader->modificationTime = gf_isom_get_mp4time();

	txt = (GF_Tx3gSampleEntryBox *) gf_isom_box_new(GF_ISOM_BOX_TYPE_TX3G);
	if (!txt) return GF_OUT_OF_MEM;
	txt->dataReferenceIndex = dataRefIndex;
	gf_list_add(trak->Media->information->sampleTable->SampleDescription->child_boxes, txt);
	if (outDescriptionIndex) *outDescriptionIndex = gf_list_count(trak->Media->information->sampleTable->SampleDescription->child_boxes);

	txt->back_color = desc->back_color;
	txt->default_box = desc->default_pos;
	txt->default_style = desc->default_style;
	txt->displayFlags = desc->displayFlags;
	txt->vertical_justification = desc->vert_justif;
	txt->horizontal_justification = desc->horiz_justif;
	txt->font_table = (GF_FontTableBox *)gf_isom_box_new_parent(&txt->child_boxes, GF_ISOM_BOX_TYPE_FTAB);
	if (!txt->font_table) return GF_OUT_OF_MEM;
	txt->font_table->entry_count = desc->font_count;
	if (!desc->font_count) return GF_OK;

	txt->font_table->fonts = (GF_FontRecord *) gf_malloc(sizeof(GF_FontRecord) * desc->font_count);
	if (!txt->font_table->fonts) return GF_OUT_OF_MEM;
	for (i=0; i<desc->font_count; i++) {
		txt->font_table->fonts[i].fontID = desc->fonts[i].fontID;
		if (desc->fonts[i].fontName) txt->font_table->fonts[i].fontName = gf_strdup(desc->fonts[i].fontName);
	}
	return e;
}


/*blindly adds text - note we don't rely on terminaison characters to handle utf8 and utf16 data
in the same way. It is the user responsibility to signal UTF16*/
GF_EXPORT
GF_Err gf_isom_text_add_text(GF_TextSample *samp, char *text_data, u32 text_len)
{
	if (!samp) return GF_BAD_PARAM;
	if (!text_len) return GF_OK;
	samp->text = (char*)gf_realloc(samp->text, sizeof(char) * (samp->len + text_len) );
	memcpy(samp->text + samp->len, text_data, sizeof(char) * text_len);
	samp->len += text_len;
	return GF_OK;
}

#if 0 //unused
/*! sets UTF16 marker for text data. This MUST be called on an empty sample. If text data added later
on (cf below) is not formatted as UTF16 data(2 bytes char) the resulting text sample won't be compliant,
but this library won't warn
\param tx_samp the target text sample
\return error if any
*/
GF_Err gf_isom_text_set_utf16_marker(GF_TextSample *samp)
{
	/*we MUST have an empty sample*/
	if (!samp || samp->text) return GF_BAD_PARAM;
	samp->text = (char*)gf_malloc(sizeof(char) * 2);
	if (!samp->text) return GF_OUT_OF_MEM;
	samp->text[0] = (char) 0xFE;
	samp->text[1] = (char) 0xFF;
	samp->len = 2;
	return GF_OK;
}
#endif //unused

GF_EXPORT
GF_Err gf_isom_text_add_style(GF_TextSample *samp, GF_StyleRecord *rec)
{
	if (!samp || !rec) return GF_BAD_PARAM;

	if (!samp->styles) {
		samp->styles = (GF_TextStyleBox *) gf_isom_box_new(GF_ISOM_BOX_TYPE_STYL);
		if (!samp->styles) return GF_OUT_OF_MEM;
	}
	samp->styles->styles = (GF_StyleRecord*)gf_realloc(samp->styles->styles, sizeof(GF_StyleRecord)*(samp->styles->entry_count+1));
	if (!samp->styles->styles) return GF_OUT_OF_MEM;
	samp->styles->styles[samp->styles->entry_count] = *rec;
	samp->styles->entry_count++;
	return GF_OK;
}

GF_EXPORT
GF_Err gf_isom_text_add_highlight(GF_TextSample *samp, u16 start_char, u16 end_char)
{
	GF_TextHighlightBox *a;
	if (!samp) return GF_BAD_PARAM;
	if (start_char == end_char) return GF_BAD_PARAM;

	a = (GF_TextHighlightBox *) gf_isom_box_new(GF_ISOM_BOX_TYPE_HLIT);
	if (!a) return GF_OUT_OF_MEM;
	a->startcharoffset = start_char;
	a->endcharoffset = end_char;
	return gf_list_add(samp->others, a);
}


GF_EXPORT
GF_Err gf_isom_text_set_highlight_color(GF_TextSample *samp, u32 argb)
{
	if (!samp) return GF_BAD_PARAM;

	if (!samp->highlight_color) {
		samp->highlight_color = (GF_TextHighlightColorBox *) gf_isom_box_new(GF_ISOM_BOX_TYPE_HCLR);
		if (!samp->highlight_color) return GF_OUT_OF_MEM;
	}
	samp->highlight_color->hil_color = argb;
	return GF_OK;
}

/*3GPP spec is quite obscur here*/
GF_EXPORT
GF_Err gf_isom_text_add_karaoke(GF_TextSample *samp, u32 start_time)
{
	if (!samp) return GF_BAD_PARAM;
	samp->cur_karaoke = (GF_TextKaraokeBox *) gf_isom_box_new(GF_ISOM_BOX_TYPE_KROK);
	if (!samp->cur_karaoke) return GF_OUT_OF_MEM;
	samp->cur_karaoke->highlight_starttime = start_time;
	return gf_list_add(samp->others, samp->cur_karaoke);
}

GF_EXPORT
GF_Err gf_isom_text_set_karaoke_segment(GF_TextSample *samp, u32 end_time, u16 start_char, u16 end_char)
{
	if (!samp || !samp->cur_karaoke) return GF_BAD_PARAM;
	samp->cur_karaoke->records = (KaraokeRecord*)gf_realloc(samp->cur_karaoke->records, sizeof(KaraokeRecord)*(samp->cur_karaoke->nb_entries+1));
	if (!samp->cur_karaoke->records) return GF_OUT_OF_MEM;
	samp->cur_karaoke->records[samp->cur_karaoke->nb_entries].end_charoffset = end_char;
	samp->cur_karaoke->records[samp->cur_karaoke->nb_entries].start_charoffset = start_char;
	samp->cur_karaoke->records[samp->cur_karaoke->nb_entries].highlight_endtime = end_time;
	samp->cur_karaoke->nb_entries++;
	return GF_OK;
}

GF_EXPORT
GF_Err gf_isom_text_set_scroll_delay(GF_TextSample *samp, u32 scroll_delay)
{
	if (!samp) return GF_BAD_PARAM;
	if (!samp->scroll_delay) {
		samp->scroll_delay = (GF_TextScrollDelayBox*) gf_isom_box_new(GF_ISOM_BOX_TYPE_DLAY);
		if (!samp->scroll_delay) return GF_OUT_OF_MEM;
	}
	samp->scroll_delay->scroll_delay = scroll_delay;
	return GF_OK;
}

GF_EXPORT
GF_Err gf_isom_text_add_hyperlink(GF_TextSample *samp, char *URL, char *altString, u16 start_char, u16 end_char)
{
	GF_TextHyperTextBox*a;
	if (!samp) return GF_BAD_PARAM;
	a = (GF_TextHyperTextBox*) gf_isom_box_new(GF_ISOM_BOX_TYPE_HREF);
	if (!a) return GF_OUT_OF_MEM;
	a->startcharoffset = start_char;
	a->endcharoffset = end_char;
	a->URL = URL ? gf_strdup(URL) : NULL;
	a->URL_hint = altString ? gf_strdup(altString) : NULL;
	return gf_list_add(samp->others, a);
}

GF_EXPORT
GF_Err gf_isom_text_set_box(GF_TextSample *samp, s16 top, s16 left, s16 bottom, s16 right)
{
	if (!samp) return GF_BAD_PARAM;
	if (!samp->box) {
		samp->box = (GF_TextBoxBox*) gf_isom_box_new(GF_ISOM_BOX_TYPE_TBOX);
		if (!samp->box) return GF_OUT_OF_MEM;
	}
	samp->box->box.top = top;
	samp->box->box.left = left;
	samp->box->box.bottom = bottom;
	samp->box->box.right = right;
	return GF_OK;
}

GF_EXPORT
GF_Err gf_isom_text_add_blink(GF_TextSample *samp, u16 start_char, u16 end_char)
{
	GF_TextBlinkBox *a;
	if (!samp) return GF_BAD_PARAM;
	a = (GF_TextBlinkBox*) gf_isom_box_new(GF_ISOM_BOX_TYPE_BLNK);
	if (!a) return GF_OUT_OF_MEM;
	a->startcharoffset = start_char;
	a->endcharoffset = end_char;
	return gf_list_add(samp->others, a);
}

GF_EXPORT
GF_Err gf_isom_text_set_wrap(GF_TextSample *samp, u8 wrap_flags)
{
	if (!samp) return GF_BAD_PARAM;
	if (!samp->wrap) {
		samp->wrap = (GF_TextWrapBox*) gf_isom_box_new(GF_ISOM_BOX_TYPE_TWRP);
		if (!samp->wrap) return GF_OUT_OF_MEM;
	}
	samp->wrap->wrap_flag = wrap_flags;
	return GF_OK;
}

GF_EXPORT
GF_Err gf_isom_text_set_forced(GF_TextSample *samp, Bool is_forced)
{
	if (!samp) return GF_BAD_PARAM;
	samp->is_forced = is_forced;
	return GF_OK;
}

static GFINLINE GF_Err gpp_write_modifier(GF_BitStream *bs, GF_Box *a)
{
	GF_Err e;
	if (!a) return GF_OK;
	e = gf_isom_box_size(a);
	if (!e) e = gf_isom_box_write(a, bs);
	return e;
}

GF_EXPORT
GF_Err gf_isom_text_sample_write_bs(const GF_TextSample *samp, GF_BitStream *bs)
{
	GF_Err e;
	u32 i;
	if (!samp) return GF_BAD_PARAM;

	gf_bs_write_u16(bs, samp->len);
	if (samp->len) gf_bs_write_data(bs, samp->text, samp->len);

	e = gpp_write_modifier(bs, (GF_Box *)samp->styles);
	if (!e) e = gpp_write_modifier(bs, (GF_Box *)samp->highlight_color);
	if (!e) e = gpp_write_modifier(bs, (GF_Box *)samp->scroll_delay);
	if (!e) e = gpp_write_modifier(bs, (GF_Box *)samp->box);
	if (!e) e = gpp_write_modifier(bs, (GF_Box *)samp->wrap);

	if (!e && samp->is_forced) {
		gf_bs_write_u32(bs, 8);
		gf_bs_write_u32(bs, GF_QT_BOX_TYPE_FRCD);
	}

	if (!e) {
		GF_Box *a;
		i=0;
		while ((a = (GF_Box*)gf_list_enum(samp->others, &i))) {
			e = gpp_write_modifier(bs, a);
			if (e) break;
		}
	}
	return e;
}

GF_EXPORT
GF_ISOSample *gf_isom_text_to_sample(const GF_TextSample *samp)
{
	GF_Err e;
	GF_ISOSample *res;
	GF_BitStream *bs;
	if (!samp) return NULL;

	bs = gf_bs_new(NULL, 0, GF_BITSTREAM_WRITE);

	e = gf_isom_text_sample_write_bs(samp, bs);

	if (e) {
		gf_bs_del(bs);
		return NULL;
	}
	res = gf_isom_sample_new();
	if (!res) {
		gf_bs_del(bs);
		return NULL;
	}
	gf_bs_get_content(bs, &res->data, &res->dataLength);
	gf_bs_del(bs);
	res->IsRAP = RAP;
	return res;
}

u32 gf_isom_text_sample_size(GF_TextSample *samp)
{
	GF_Box *a;
	u32 i, size;
	if (!samp) return 0;

	size = 2 + samp->len;
	if (samp->styles) {
		gf_isom_box_size((GF_Box *)samp->styles);
		size += (u32) samp->styles->size;
	}
	if (samp->highlight_color) {
		gf_isom_box_size((GF_Box *)samp->highlight_color);
		size += (u32) samp->highlight_color->size;
	}
	if (samp->scroll_delay) {
		gf_isom_box_size((GF_Box *)samp->scroll_delay);
		size += (u32) samp->scroll_delay->size;
	}
	if (samp->box) {
		gf_isom_box_size((GF_Box *)samp->box);
		size += (u32) samp->box->size;
	}
	if (samp->wrap) {
		gf_isom_box_size((GF_Box *)samp->wrap);
		size += (u32) samp->wrap->size;
	}
	if (samp->is_forced) {
		size += 8;
	}
	i=0;
	while ((a = (GF_Box*)gf_list_enum(samp->others, &i))) {
		gf_isom_box_size((GF_Box *)a);
		size += (u32) a->size;
	}
	return size;
}

#if 0 //unused
/*! checks if this text description is already inserted
\param isom_file the target ISO file
\param trackNumber the target track
\param desc the 3GPP text sample description to check
\param outDescIdx set to 0 if not found, or index of the matching sample description
\param same_styles indicates if default styles matches
\param same_box indicates if default box matches
*/
GF_Err gf_isom_text_has_similar_description(GF_ISOFile *movie, u32 trackNumber, GF_TextSampleDescriptor *desc, u32 *outDescIdx, Bool *same_box, Bool *same_styles)
{
	GF_TrackBox *trak;
	GF_Err e;
	u32 i, j, count;
	GF_Tx3gSampleEntryBox *txt;

	*same_box = *same_styles = 0;
	*outDescIdx = 0;

	if (!desc) return GF_BAD_PARAM;
	e = gf_isom_can_access_movie(movie, GF_ISOM_OPEN_WRITE);
	if (e) return GF_BAD_PARAM;

	trak = gf_isom_get_track_box(movie, trackNumber);
	if (!trak || !trak->Media || !desc->font_count) return GF_BAD_PARAM;

	switch (trak->Media->handler->handlerType) {
	case GF_ISOM_MEDIA_TEXT:
	case GF_ISOM_MEDIA_SUBT:
	case GF_ISOM_MEDIA_MPEG_SUBT:
		break;
	default:
		return GF_BAD_PARAM;
	}

	count = gf_list_count(trak->Media->information->sampleTable->SampleDescription->child_boxes);
	for (i=0; i<count; i++) {
		Bool same_fonts;
		txt = (GF_Tx3gSampleEntryBox*)gf_list_get(trak->Media->information->sampleTable->SampleDescription->child_boxes, i);
		if (!txt) continue;
		if ((txt->type != GF_ISOM_BOX_TYPE_TX3G) && (txt->type != GF_ISOM_BOX_TYPE_TEXT)) continue;
		if (txt->back_color != desc->back_color) continue;
		if (txt->displayFlags != desc->displayFlags) continue;
		if (txt->vertical_justification != desc->vert_justif) continue;
		if (txt->horizontal_justification != desc->horiz_justif) continue;
		if (txt->font_table->entry_count != desc->font_count) continue;

		same_fonts = 1;
		for (j=0; j<desc->font_count; j++) {
			if (txt->font_table->fonts[j].fontID != desc->fonts[j].fontID) same_fonts = 0;
			else if (strcmp(desc->fonts[j].fontName, txt->font_table->fonts[j].fontName)) same_fonts = 0;
		}
		if (same_fonts) {
			*outDescIdx = i+1;
			if (!memcmp(&txt->default_box, &desc->default_pos, sizeof(GF_BoxRecord))) *same_box = 1;
			if (!memcmp(&txt->default_style, &desc->default_style, sizeof(GF_StyleRecord))) *same_styles = 1;
			return GF_OK;
		}
	}
	return GF_OK;
}
#endif

#endif /*GPAC_DISABLE_ISOM_WRITE*/

GF_EXPORT
GF_TextSample *gf_isom_new_text_sample()
{
	GF_TextSample *res;
	GF_SAFEALLOC(res, GF_TextSample);
	if (!res) return NULL;
	res->others = gf_list_new();
	return res;
}

GF_EXPORT
GF_Err gf_isom_text_reset_styles(GF_TextSample *samp)
{
	if (!samp) return GF_BAD_PARAM;
	if (samp->box) gf_isom_box_del((GF_Box *)samp->box);
	samp->box = NULL;
	if (samp->highlight_color) gf_isom_box_del((GF_Box *)samp->highlight_color);
	samp->highlight_color = NULL;
	if (samp->scroll_delay) gf_isom_box_del((GF_Box *)samp->scroll_delay);
	samp->scroll_delay = NULL;
	if (samp->wrap) gf_isom_box_del((GF_Box *)samp->wrap);
	samp->wrap = NULL;
	if (samp->styles) gf_isom_box_del((GF_Box *)samp->styles);
	samp->styles = NULL;
	samp->cur_karaoke = NULL;
	while (gf_list_count(samp->others)) {
		GF_Box *a = (GF_Box*)gf_list_get(samp->others, 0);
		gf_list_rem(samp->others, 0);
		gf_isom_box_del(a);
	}
	samp->is_forced = GF_FALSE;
	return GF_OK;
}

GF_EXPORT
GF_Err gf_isom_text_reset(GF_TextSample *samp)
{
	if (!samp) return GF_BAD_PARAM;
	if (samp->text) gf_free(samp->text);
	samp->text = NULL;
	samp->len = 0;
	return gf_isom_text_reset_styles(samp);
}

GF_EXPORT
void gf_isom_delete_text_sample(GF_TextSample * tx_samp)
{
	gf_isom_text_reset(tx_samp);
	gf_list_del(tx_samp->others);
	gf_free(tx_samp);
}

GF_EXPORT
GF_TextSample *gf_isom_parse_text_sample(GF_BitStream *bs)
{
	GF_TextSample *s = gf_isom_new_text_sample();

	/*empty sample*/
	if (!bs || !gf_bs_available(bs)) return s;

	s->len = gf_bs_read_u16(bs);
	if (s->len) {
		/*2 extra bytes for UTF-16 term char just in case (we don't know if a BOM marker is present or
		not since this may be a sample carried over RTP*/
		s->text = (char *) gf_malloc(sizeof(char)*(s->len+2) );
		if (!s->text) return NULL;
		s->text[s->len] = 0;
		s->text[s->len+1] = 0;
		gf_bs_read_data(bs, s->text, s->len);
	}

	while (gf_bs_available(bs)) {
		GF_Box *a = NULL;
		GF_Err e = gf_isom_box_parse(&a, bs);
		if (e) {
			if (a) gf_isom_box_del(a);
			break;
		}

		switch (a->type) {
		case GF_ISOM_BOX_TYPE_STYL:
			if (s->styles) {
				GF_TextStyleBox *st2 = (GF_TextStyleBox *)a;
				if (!s->styles->entry_count) {
					gf_isom_box_del((GF_Box*)s->styles);
					s->styles = st2;
				} else {
					s->styles->styles = (GF_StyleRecord*)gf_realloc(s->styles->styles, sizeof(GF_StyleRecord) * (s->styles->entry_count + st2->entry_count));
					memcpy(&s->styles->styles[s->styles->entry_count], st2->styles, sizeof(GF_StyleRecord) * st2->entry_count);
					s->styles->entry_count += st2->entry_count;
					gf_isom_box_del(a);
				}
			} else {
				s->styles = (GF_TextStyleBox*)a;
			}
			break;
		case GF_ISOM_BOX_TYPE_KROK:
			s->cur_karaoke = (GF_TextKaraokeBox*)a;
		case GF_ISOM_BOX_TYPE_HLIT:
		case GF_ISOM_BOX_TYPE_HREF:
		case GF_ISOM_BOX_TYPE_BLNK:
			gf_list_add(s->others, a);
			break;
		case GF_ISOM_BOX_TYPE_HCLR:
			if (s->highlight_color) gf_isom_box_del(a);
			else s->highlight_color = (GF_TextHighlightColorBox *) a;
			break;
		case GF_ISOM_BOX_TYPE_DLAY:
			if (s->scroll_delay) gf_isom_box_del(a);
			else s->scroll_delay= (GF_TextScrollDelayBox*) a;
			break;
		case GF_ISOM_BOX_TYPE_TBOX:
			if (s->box) gf_isom_box_del(a);
			else s->box= (GF_TextBoxBox *) a;
			break;
		case GF_ISOM_BOX_TYPE_TWRP:
			if (s->wrap) gf_isom_box_del(a);
			else s->wrap= (GF_TextWrapBox*) a;
			break;
		case GF_QT_BOX_TYPE_FRCD:
			s->is_forced = GF_TRUE;
			gf_isom_box_del(a);
			break;
		default:
			gf_isom_box_del(a);
			break;
		}
	}
	return s;
}

#if 0 //unused
GF_TextSample *gf_isom_parse_text_sample_from_data(u8 *data, u32 dataLength)
{
	GF_TextSample *s;
	GF_BitStream *bs;
	/*empty text sample*/
	if (!data || !dataLength) {
		return gf_isom_new_text_sample();
	}

	bs = gf_bs_new(data, dataLength, GF_BITSTREAM_READ);
	s = gf_isom_parse_text_sample(bs);
	gf_bs_del(bs);
	return s;
}
#endif


/*out-of-band sample desc (128 and 255 reserved in RFC)*/
#define SAMPLE_INDEX_OFFSET		129


static void gf_isom_write_tx3g(GF_Tx3gSampleEntryBox *_a, GF_BitStream *bs, u32 sidx, u32 sidx_offset)
{
	u32 size, j, fount_count;
	const char *qt_fontname = NULL;
	void gpp_write_rgba(GF_BitStream *bs, u32 col);
	void gpp_write_box(GF_BitStream *bs, GF_BoxRecord *rec);
	void gpp_write_style(GF_BitStream *bs, GF_StyleRecord *rec);

	GF_TextSampleEntryBox *qt = (_a->type==GF_ISOM_BOX_TYPE_TEXT) ? (GF_TextSampleEntryBox *)_a : NULL;
	GF_Tx3gSampleEntryBox *ttxt = (_a->type!=GF_ISOM_BOX_TYPE_TEXT) ? (GF_Tx3gSampleEntryBox *)_a : NULL;

	if (sidx_offset) gf_bs_write_u8(bs, sidx + sidx_offset);

	/*SINCE WINCE HAS A READONLY VERSION OF MP4 WE MUST DO IT BY HAND*/
	size = 8 + 18 + 8 + 12;
	size += 8 + 2;
	fount_count = 0;
	if (qt && qt->textName) {
		qt_fontname = qt->textName;
		fount_count = 1;
	} else if (ttxt && ttxt->font_table) {
		fount_count = ttxt->font_table->entry_count;
		for (j=0; j<fount_count; j++) {
			size += 3;
			if (ttxt->font_table->fonts[j].fontName)
				size += (u32) strlen(ttxt->font_table->fonts[j].fontName);
		}
	}
	/*write TextSampleEntry box*/
	gf_bs_write_u32(bs, size);
	gf_bs_write_u32(bs, GF_ISOM_BOX_TYPE_TX3G);
	gf_bs_write_data(bs, _a->reserved, 6);
	gf_bs_write_u16(bs, _a->dataReferenceIndex);
	gf_bs_write_u32(bs, _a->displayFlags);
	if (qt) {
		GF_StyleRecord sr;
		memset(&sr, 0, sizeof(GF_StyleRecord));
		gf_bs_write_u8(bs, qt->textJustification);
		gf_bs_write_u8(bs, (u8) -1);
		gpp_write_rgba(bs, rgb_48_to_32(qt->background_color) );
		gpp_write_box(bs, &qt->default_box);
		sr.text_color = rgb_48_to_32(qt->foreground_color);
		sr.style_flags = 0; //todo expose qt->fontFace;
		gpp_write_style(bs, &sr);
	} else {
		gf_bs_write_u8(bs, ttxt->horizontal_justification);
		gf_bs_write_u8(bs, ttxt->vertical_justification);
		gpp_write_rgba(bs, ttxt->back_color);
		gpp_write_box(bs, &ttxt->default_box);
		gpp_write_style(bs, &ttxt->default_style);
	}
	/*write font table box*/
	size -= (8 + 18 + 8 + 12);
	gf_bs_write_u32(bs, size);
	gf_bs_write_u32(bs, GF_ISOM_BOX_TYPE_FTAB);

	gf_bs_write_u16(bs, fount_count);
	for (j=0; j<fount_count; j++) {
		if (qt) {
			gf_bs_write_u16(bs, 0);
			if (qt_fontname) {
				u32 len = (u32) strlen(qt_fontname);
				gf_bs_write_u8(bs, len);
				gf_bs_write_data(bs, qt_fontname, len);
			} else {
				gf_bs_write_u8(bs, 0);
			}
		} else {
			gf_bs_write_u16(bs, ttxt->font_table->fonts[j].fontID);
			if (ttxt->font_table->fonts[j].fontName) {
				u32 len = (u32) strlen(ttxt->font_table->fonts[j].fontName);
				gf_bs_write_u8(bs, len);
				gf_bs_write_data(bs, ttxt->font_table->fonts[j].fontName, len);
			} else {
				gf_bs_write_u8(bs, 0);
			}
		}
	}
}

GF_Err gf_isom_get_ttxt_esd(GF_MediaBox *mdia, GF_ESD **out_esd)
{
	GF_BitStream *bs;
	u32 count, i;
	Bool has_v_info;
	GF_List *sampleDesc;
	GF_ESD *esd;
	GF_TrackBox *tk;

	*out_esd = NULL;
	sampleDesc = mdia->information->sampleTable->SampleDescription->child_boxes;
	count = gf_list_count(sampleDesc);
	if (!count) return GF_ISOM_INVALID_MEDIA;

	esd = gf_odf_desc_esd_new(2);
	esd->decoderConfig->streamType = GF_STREAM_TEXT;
	esd->decoderConfig->objectTypeIndication = GF_CODECID_TEXT_MPEG4;

	bs = gf_bs_new(NULL, 0, GF_BITSTREAM_WRITE);


	/*Base3GPPFormat*/
	gf_bs_write_u8(bs, 0x10);
	/*MPEGExtendedFormat*/
	gf_bs_write_u8(bs, 0x10);
	/*profileLevel*/
	gf_bs_write_u8(bs, 0x10);
	gf_bs_write_u24(bs, mdia->mediaHeader->timeScale);
	gf_bs_write_int(bs, 0, 1);	/*no alt formats*/
	gf_bs_write_int(bs, 2, 2);	/*only out-of-band-band sample desc*/
	gf_bs_write_int(bs, 1, 1);	/*we will write sample desc*/

	/*write v info if any visual track in this movie*/
	has_v_info = 0;
	i=0;
	while ((tk = (GF_TrackBox*)gf_list_enum(mdia->mediaTrack->moov->trackList, &i))) {
		if (tk->Media->handler && (tk->Media->handler->handlerType == GF_ISOM_MEDIA_VISUAL)) {
			has_v_info = 1;
		}
	}
	gf_bs_write_int(bs, has_v_info, 1);

	gf_bs_write_int(bs, 0, 3);	/*reserved, spec doesn't say the values*/
	gf_bs_write_u8(bs, mdia->mediaTrack->Header->layer);
	gf_bs_write_u16(bs, mdia->mediaTrack->Header->width>>16);
	gf_bs_write_u16(bs, mdia->mediaTrack->Header->height>>16);

	/*write desc*/
	gf_bs_write_u8(bs, count);
	for (i=0; i<count; i++) {
		GF_Tx3gSampleEntryBox *a;
		a = (GF_Tx3gSampleEntryBox *) gf_list_get(sampleDesc, i);
		if ((a->type != GF_ISOM_BOX_TYPE_TX3G) && (a->type != GF_ISOM_BOX_TYPE_TEXT) ) continue;
		gf_isom_write_tx3g(a, bs, i+1, SAMPLE_INDEX_OFFSET);
	}
	if (has_v_info) {
		u32 trans;
		/*which video shall we pick for MPEG-4, and how is the associations indicated in 3GP ???*/
		gf_bs_write_u16(bs, 0);
		gf_bs_write_u16(bs, 0);
		trans = mdia->mediaTrack->Header->matrix[6];
		trans >>= 16;
		gf_bs_write_u16(bs, trans);
		trans = mdia->mediaTrack->Header->matrix[7];
		trans >>= 16;
		gf_bs_write_u16(bs, trans);
	}

	gf_bs_get_content(bs, &esd->decoderConfig->decoderSpecificInfo->data, &esd->decoderConfig->decoderSpecificInfo->dataLength);
	gf_bs_del(bs);
	*out_esd = esd;
	return GF_OK;
}

GF_Err gf_isom_rewrite_text_sample(GF_ISOSample *samp, u32 sampleDescriptionIndex, u32 sample_dur)
{
	GF_BitStream *bs;
	u32 pay_start, txt_size;
	Bool is_utf_16 = 0;
	if (!samp || !samp->data || !samp->dataLength) return GF_OK;

	bs = gf_bs_new(samp->data, samp->dataLength, GF_BITSTREAM_READ);
	txt_size = gf_bs_read_u16(bs);
	gf_bs_del(bs);

	/*remove BOM*/
	pay_start = 2;
	if (txt_size>2) {
		/*seems 3GP only accepts BE UTF-16 (no LE, no UTF32)*/
		if (((u8) samp->data[2]==(u8) 0xFE) && ((u8)samp->data[3]==(u8) 0xFF)) {
			is_utf_16 = 1;
			pay_start = 4;
			txt_size -= 2;
		}
	}

	/*rewrite as TTU(1)*/
	bs = gf_bs_new(NULL, 0, GF_BITSTREAM_WRITE);
	gf_bs_write_int(bs, is_utf_16, 1);
	gf_bs_write_int(bs, 0, 4);
	gf_bs_write_int(bs, 1, 3);
	gf_bs_write_u16(bs, 8 + samp->dataLength - pay_start);
	gf_bs_write_u8(bs, sampleDescriptionIndex + SAMPLE_INDEX_OFFSET);
	gf_bs_write_u24(bs, sample_dur);
	/*write text size*/
	gf_bs_write_u16(bs, txt_size);
	if (txt_size) gf_bs_write_data(bs, samp->data + pay_start, samp->dataLength - pay_start);

	gf_free(samp->data);
	samp->data = NULL;
	gf_bs_get_content(bs, &samp->data, &samp->dataLength);
	gf_bs_del(bs);
	return GF_OK;
}


GF_Err gf_isom_text_get_encoded_tx3g(GF_ISOFile *file, u32 track, u32 sidx, u32 sidx_offset, u8 **tx3g, u32 *tx3g_size)
{
	GF_BitStream *bs;
	GF_TrackBox *trak;
	GF_Tx3gSampleEntryBox *a;

	*tx3g = NULL;
	*tx3g_size = 0;
	trak = gf_isom_get_track_box(file, track);
	if (!trak) return GF_BAD_PARAM;

	a = (GF_Tx3gSampleEntryBox *) gf_list_get(trak->Media->information->sampleTable->SampleDescription->child_boxes, sidx-1);
	if (!a) return GF_BAD_PARAM;
	if ((a->type != GF_ISOM_BOX_TYPE_TX3G) && (a->type != GF_ISOM_BOX_TYPE_TEXT)) return GF_BAD_PARAM;

	bs = gf_bs_new(NULL, 0, GF_BITSTREAM_WRITE);
	gf_isom_write_tx3g(a, bs, sidx, sidx_offset);
	gf_bs_get_content(bs, tx3g, tx3g_size);
	gf_bs_del(bs);
	return GF_OK;
}

GF_EXPORT
GF_Err gf_isom_set_forced_text(GF_ISOFile *file, u32 track, u32 stsd_idx, u32 flags)
{
	GF_TrackBox *trak;
	GF_Tx3gSampleEntryBox *a;

	trak = gf_isom_get_track_box(file, track);
	if (!trak) return GF_BAD_PARAM;

	a = (GF_Tx3gSampleEntryBox *) gf_list_get(trak->Media->information->sampleTable->SampleDescription->child_boxes, stsd_idx-1);
	if (!a) return GF_BAD_PARAM;
	if ((a->type != GF_ISOM_BOX_TYPE_TX3G) && (a->type != GF_ISOM_BOX_TYPE_TEXT)) return GF_BAD_PARAM;

	switch (flags) {
	case 2:
		a->displayFlags |= GF_TXT_SOME_SAMPLES_FORCED | GF_TXT_ALL_SAMPLES_FORCED;
		break;
	case 1:
		a->displayFlags |= GF_TXT_SOME_SAMPLES_FORCED;
		a->displayFlags &= ~GF_TXT_ALL_SAMPLES_FORCED;
		break;
	default:
		a->displayFlags &= ~GF_TXT_SOME_SAMPLES_FORCED;
		a->displayFlags &= ~GF_TXT_ALL_SAMPLES_FORCED;
		break;
	}
	return GF_OK;
}

#endif /*GPAC_DISABLE_ISOM*/