GF_Err gf_isom_3gp_config_new(GF_ISOFile *the_file, u32 trackNumber, GF_3GPConfig *cfg, const char *URLname, const char *URNname, u32 *outDescriptionIndex)
{
	GF_TrackBox *trak;
	GF_Err e;
	u32 dataRefIndex;
	u32 cfg_type;
	GF_SampleDescriptionBox *stsd;

	e = CanAccessMovie(the_file, GF_ISOM_OPEN_WRITE);
	if (e) return e;

	trak = gf_isom_get_track_from_file(the_file, trackNumber);
	if (!trak || !trak->Media || !cfg) return GF_BAD_PARAM;

	switch (cfg->type) {
	case GF_ISOM_SUBTYPE_3GP_AMR:
	case GF_ISOM_SUBTYPE_3GP_AMR_WB:
		if (trak->Media->handler->handlerType!=GF_ISOM_MEDIA_AUDIO) return GF_BAD_PARAM;
		cfg_type = GF_ISOM_BOX_TYPE_DAMR;
		break;
	case GF_ISOM_SUBTYPE_3GP_EVRC:
		if (trak->Media->handler->handlerType!=GF_ISOM_MEDIA_AUDIO) return GF_BAD_PARAM;
		cfg_type = GF_ISOM_BOX_TYPE_DEVC;
		break;
	case GF_ISOM_SUBTYPE_3GP_QCELP:
		if (trak->Media->handler->handlerType!=GF_ISOM_MEDIA_AUDIO) return GF_BAD_PARAM;
		cfg_type = GF_ISOM_BOX_TYPE_DQCP;
		break;
	case GF_ISOM_SUBTYPE_3GP_SMV:
		if (trak->Media->handler->handlerType!=GF_ISOM_MEDIA_AUDIO) return GF_BAD_PARAM;
		cfg_type = GF_ISOM_BOX_TYPE_DSMV;
		break;
	case GF_ISOM_SUBTYPE_3GP_H263:
		if (!gf_isom_is_video_handler_type(trak->Media->handler->handlerType)) return GF_BAD_PARAM;
		cfg_type = GF_ISOM_BOX_TYPE_D263;
		break;
	case 0:
		return GF_BAD_PARAM;
	default:
		return GF_NOT_SUPPORTED;
	}

	//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(the_file, trak->Media->information->dataInformation->dref, (char *)URLname, (char *)URNname, &dataRefIndex);
		if (e) return e;
	}
	if (!the_file->keep_utc)
		trak->Media->mediaHeader->modificationTime = gf_isom_get_mp4time();

	stsd = trak->Media->information->sampleTable->SampleDescription;

	switch (cfg->type) {
	case GF_ISOM_SUBTYPE_3GP_AMR:
	case GF_ISOM_SUBTYPE_3GP_AMR_WB:
	case GF_ISOM_SUBTYPE_3GP_EVRC:
	case GF_ISOM_SUBTYPE_3GP_QCELP:
	case GF_ISOM_SUBTYPE_3GP_SMV:
	{
		GF_MPEGAudioSampleEntryBox *entry = (GF_MPEGAudioSampleEntryBox *) gf_isom_box_new_parent(&stsd->child_boxes, cfg->type);
		if (!entry) return GF_OUT_OF_MEM;
		entry->cfg_3gpp = (GF_3GPPConfigBox *) gf_isom_box_new_parent(&entry->child_boxes, cfg_type);
		if (!entry->cfg_3gpp) {
			gf_isom_box_del((GF_Box *) entry);
			return GF_OUT_OF_MEM;
		}
		memcpy(&entry->cfg_3gpp->cfg, cfg, sizeof(GF_3GPConfig));
		entry->samplerate_hi = trak->Media->mediaHeader->timeScale;
		entry->dataReferenceIndex = dataRefIndex;
		*outDescriptionIndex = gf_list_count(trak->Media->information->sampleTable->SampleDescription->child_boxes);
	}
	break;
	case GF_ISOM_SUBTYPE_3GP_H263:
	{
		GF_MPEGVisualSampleEntryBox *entry = (GF_MPEGVisualSampleEntryBox *) gf_isom_box_new_parent(&stsd->child_boxes, cfg->type);
		if (!entry) return GF_OUT_OF_MEM;
		entry->cfg_3gpp = (GF_3GPPConfigBox *) gf_isom_box_new_parent(&entry->child_boxes, cfg_type);
		if (!entry->cfg_3gpp) {
			gf_isom_box_del((GF_Box *) entry);
			return GF_OUT_OF_MEM;
		}
		memcpy(&entry->cfg_3gpp->cfg, cfg, sizeof(GF_3GPConfig));
		entry->dataReferenceIndex = dataRefIndex;
		*outDescriptionIndex = gf_list_count(trak->Media->information->sampleTable->SampleDescription->child_boxes);
	}
	break;
	}
	return e;
}