GF_Err gf_isom_ismacryp_sample_to_sample(const GF_ISMASample *s, GF_ISOSample *dest)
{
	GF_BitStream *bs;
	if (!s || !dest) return GF_BAD_PARAM;

	bs = gf_bs_new(NULL, 0, GF_BITSTREAM_WRITE);

	if (s->flags & GF_ISOM_ISMA_USE_SEL_ENC) {
		gf_bs_write_int(bs, (s->flags & GF_ISOM_ISMA_IS_ENCRYPTED) ? 1 : 0, 1);
		gf_bs_write_int(bs, 0, 7);
	}
	if (s->flags & GF_ISOM_ISMA_IS_ENCRYPTED) {
		if (s->IV_length) gf_bs_write_long_int(bs, (s64) s->IV, 8*s->IV_length);
		if (s->KI_length) gf_bs_write_data(bs, (char*)s->key_indicator, s->KI_length);
	}
	gf_bs_write_data(bs, s->data, s->dataLength);
	if (dest->data) gf_free(dest->data);
	dest->data = NULL;
	dest->dataLength = 0;
	gf_bs_get_content(bs, &dest->data, &dest->dataLength);
	gf_bs_del(bs);
	return GF_OK;
}
GF_Err gf_isom_ismacryp_sample_to_sample(const GF_ISMASample *s, GF_ISOSample *dest)
{
	GF_BitStream *bs;
	if (!s || !dest) return GF_BAD_PARAM;

	bs = gf_bs_new(NULL, 0, GF_BITSTREAM_WRITE);

	if (s->flags & GF_ISOM_ISMA_USE_SEL_ENC) {
		gf_bs_write_int(bs, (s->flags & GF_ISOM_ISMA_IS_ENCRYPTED) ? 1 : 0, 1);
		gf_bs_write_int(bs, 0, 7);
	}
	if (s->flags & GF_ISOM_ISMA_IS_ENCRYPTED) {
		if (s->IV_length) gf_bs_write_long_int(bs, (s64) s->IV, 8*s->IV_length);
		if (s->KI_length) gf_bs_write_data(bs, (char*)s->key_indicator, s->KI_length);
	}
	gf_bs_write_data(bs, s->data, s->dataLength);
	if (dest->data) gf_free(dest->data);
	dest->data = NULL;
	dest->dataLength = 0;
	gf_bs_get_content(bs, &dest->data, &dest->dataLength);
	gf_bs_del(bs);
	return GF_OK;
}