* @return 0 on success, -1 on critical buffer underflow
*/
static int tgv_decode_inter(TgvContext * s, const uint8_t *buf, const uint8_t *buf_end){
* @return 0 on success, -1 on critical buffer underflow
*/
static int tgv_decode_inter(TgvContext * s, const uint8_t *buf, const uint8_t *buf_end){